1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 2f46b5a66SChristoph Hellwig /* 3f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 4f46b5a66SChristoph Hellwig */ 5f46b5a66SChristoph Hellwig 6f46b5a66SChristoph Hellwig #include <linux/kernel.h> 7f46b5a66SChristoph Hellwig #include <linux/bio.h> 8f46b5a66SChristoph Hellwig #include <linux/file.h> 9f46b5a66SChristoph Hellwig #include <linux/fs.h> 10cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 11f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 12f46b5a66SChristoph Hellwig #include <linux/highmem.h> 13f46b5a66SChristoph Hellwig #include <linux/time.h> 14f46b5a66SChristoph Hellwig #include <linux/string.h> 15f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 16cb8e7090SChristoph Hellwig #include <linux/mount.h> 17cb8e7090SChristoph Hellwig #include <linux/namei.h> 18f46b5a66SChristoph Hellwig #include <linux/writeback.h> 19f46b5a66SChristoph Hellwig #include <linux/compat.h> 20cb8e7090SChristoph Hellwig #include <linux/security.h> 21f46b5a66SChristoph Hellwig #include <linux/xattr.h> 22f54de068SDavid Sterba #include <linux/mm.h> 235a0e3ad6STejun Heo #include <linux/slab.h> 24f7039b1dSLi Dongyang #include <linux/blkdev.h> 258ea05e3aSAlexander Block #include <linux/uuid.h> 2655e301fdSFilipe Brandenburger #include <linux/btrfs.h> 27416161dbSMark Fasheh #include <linux/uaccess.h> 28ae5e165dSJeff Layton #include <linux/iversion.h> 29f46b5a66SChristoph Hellwig #include "ctree.h" 30f46b5a66SChristoph Hellwig #include "disk-io.h" 31f46b5a66SChristoph Hellwig #include "transaction.h" 32f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 33f46b5a66SChristoph Hellwig #include "print-tree.h" 34f46b5a66SChristoph Hellwig #include "volumes.h" 35925baeddSChris Mason #include "locking.h" 36581bb050SLi Zefan #include "inode-map.h" 37d7728c96SJan Schmidt #include "backref.h" 38606686eeSJosef Bacik #include "rcu-string.h" 3931db9f7cSAlexander Block #include "send.h" 403f6bcfbdSStefan Behrens #include "dev-replace.h" 4163541927SFilipe David Borba Manana #include "props.h" 423b02a68aSJeff Mahoney #include "sysfs.h" 43fcebe456SJosef Bacik #include "qgroup.h" 441ec9a1aeSFilipe Manana #include "tree-log.h" 45ebb8765bSAnand Jain #include "compression.h" 46f46b5a66SChristoph Hellwig 47abccd00fSHugo Mills #ifdef CONFIG_64BIT 48abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 49abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 50abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 51abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 52abccd00fSHugo Mills */ 53abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 54abccd00fSHugo Mills __u64 sec; 55abccd00fSHugo Mills __u32 nsec; 56abccd00fSHugo Mills } __attribute__ ((__packed__)); 57abccd00fSHugo Mills 58abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 59abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 60abccd00fSHugo Mills __u64 stransid; /* in */ 61abccd00fSHugo Mills __u64 rtransid; /* out */ 62abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 63abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 64abccd00fSHugo Mills __u64 flags; /* in */ 65abccd00fSHugo Mills __u64 reserved[16]; /* in */ 66abccd00fSHugo Mills } __attribute__ ((__packed__)); 67abccd00fSHugo Mills 68abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 69abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 70abccd00fSHugo Mills #endif 71abccd00fSHugo Mills 722351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 732351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 742351f431SJosef Bacik __s64 send_fd; /* in */ 752351f431SJosef Bacik __u64 clone_sources_count; /* in */ 762351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 772351f431SJosef Bacik __u64 parent_root; /* in */ 782351f431SJosef Bacik __u64 flags; /* in */ 792351f431SJosef Bacik __u64 reserved[4]; /* in */ 802351f431SJosef Bacik } __attribute__ ((__packed__)); 812351f431SJosef Bacik 822351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 832351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 842351f431SJosef Bacik #endif 85abccd00fSHugo Mills 86416161dbSMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 871c919a5eSMark Fasheh u64 off, u64 olen, u64 olen_aligned, u64 destoff, 881c919a5eSMark Fasheh int no_time_update); 89416161dbSMark Fasheh 906cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 911905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 921905a0f7SDavid Sterba unsigned int flags) 936cbff00fSChristoph Hellwig { 941905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 956cbff00fSChristoph Hellwig return flags; 961905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 976cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 986cbff00fSChristoph Hellwig else 996cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1006cbff00fSChristoph Hellwig } 101f46b5a66SChristoph Hellwig 1026cbff00fSChristoph Hellwig /* 103a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 104a157d4fdSDavid Sterba * ioctl. 1056cbff00fSChristoph Hellwig */ 106a157d4fdSDavid Sterba static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 12513f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 126d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 12713f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 12813f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1367b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1385c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1393cc79392SFilipe Manana unsigned int new_fl = 0; 1406cbff00fSChristoph Hellwig 1415c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1423cc79392SFilipe Manana new_fl |= S_SYNC; 1435c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1443cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1455c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1463cc79392SFilipe Manana new_fl |= S_APPEND; 1475c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1483cc79392SFilipe Manana new_fl |= S_NOATIME; 1495c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1503cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1513cc79392SFilipe Manana 1523cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1533cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1543cc79392SFilipe Manana new_fl); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 1595c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 1605c57b8b6SDavid Sterba unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1636cbff00fSChristoph Hellwig return -EFAULT; 1646cbff00fSChristoph Hellwig return 0; 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 1675ba76abfSDavid Sterba /* Check if @flags are a supported and valid set of FS_*_FL flags */ 1685ba76abfSDavid Sterba static int check_fsflags(unsigned int flags) 16975e7cb7fSLiu Bo { 17075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 173e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 174e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17575e7cb7fSLiu Bo return -EOPNOTSUPP; 17675e7cb7fSLiu Bo 17775e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17875e7cb7fSLiu Bo return -EINVAL; 17975e7cb7fSLiu Bo 18075e7cb7fSLiu Bo return 0; 18175e7cb7fSLiu Bo } 18275e7cb7fSLiu Bo 1836cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1846cbff00fSChristoph Hellwig { 185496ad9aaSAl Viro struct inode *inode = file_inode(file); 1860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1875c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1885c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 1896cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1905c57b8b6SDavid Sterba unsigned int fsflags, old_fsflags; 1916cbff00fSChristoph Hellwig int ret; 1925c57b8b6SDavid Sterba u64 old_flags; 1935c57b8b6SDavid Sterba unsigned int old_i_flags; 1947e97b8daSDavid Sterba umode_t mode; 1956cbff00fSChristoph Hellwig 196bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 197bd60ea0fSDavid Sterba return -EPERM; 198bd60ea0fSDavid Sterba 199b83cc969SLi Zefan if (btrfs_root_readonly(root)) 200b83cc969SLi Zefan return -EROFS; 201b83cc969SLi Zefan 2025c57b8b6SDavid Sterba if (copy_from_user(&fsflags, arg, sizeof(fsflags))) 2036cbff00fSChristoph Hellwig return -EFAULT; 2046cbff00fSChristoph Hellwig 2055c57b8b6SDavid Sterba ret = check_fsflags(fsflags); 20675e7cb7fSLiu Bo if (ret) 20775e7cb7fSLiu Bo return ret; 2086cbff00fSChristoph Hellwig 209e7848683SJan Kara ret = mnt_want_write_file(file); 210e7848683SJan Kara if (ret) 211e7848683SJan Kara return ret; 212e7848683SJan Kara 2135955102cSAl Viro inode_lock(inode); 2146cbff00fSChristoph Hellwig 2155c57b8b6SDavid Sterba old_flags = binode->flags; 2165c57b8b6SDavid Sterba old_i_flags = inode->i_flags; 2177e97b8daSDavid Sterba mode = inode->i_mode; 218f062abf0SLi Zefan 2195c57b8b6SDavid Sterba fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); 2205c57b8b6SDavid Sterba old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 2215c57b8b6SDavid Sterba if ((fsflags ^ old_fsflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 2226cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 2236cbff00fSChristoph Hellwig ret = -EPERM; 2246cbff00fSChristoph Hellwig goto out_unlock; 2256cbff00fSChristoph Hellwig } 2266cbff00fSChristoph Hellwig } 2276cbff00fSChristoph Hellwig 2285c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 2295c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 2306cbff00fSChristoph Hellwig else 2315c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 2325c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 2335c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 2346cbff00fSChristoph Hellwig else 2355c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 2365c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 2375c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 2386cbff00fSChristoph Hellwig else 2395c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 2405c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 2415c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 2426cbff00fSChristoph Hellwig else 2435c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 2445c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 2455c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 2466cbff00fSChristoph Hellwig else 2475c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 2485c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 2495c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_DIRSYNC; 2506cbff00fSChristoph Hellwig else 2515c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_DIRSYNC; 2525c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 2537e97b8daSDavid Sterba if (S_ISREG(mode)) { 2547e97b8daSDavid Sterba /* 2557e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2567e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2577e97b8daSDavid Sterba * status of the file and will not set it. 2587e97b8daSDavid Sterba */ 2597e97b8daSDavid Sterba if (inode->i_size == 0) 2605c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_NODATACOW 2617e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM; 2627e97b8daSDavid Sterba } else { 2635c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_NODATACOW; 2647e97b8daSDavid Sterba } 2657e97b8daSDavid Sterba } else { 2667e97b8daSDavid Sterba /* 26701327610SNicholas D Steeves * Revert back under same assumptions as above 2687e97b8daSDavid Sterba */ 2697e97b8daSDavid Sterba if (S_ISREG(mode)) { 2707e97b8daSDavid Sterba if (inode->i_size == 0) 2715c57b8b6SDavid Sterba binode->flags &= ~(BTRFS_INODE_NODATACOW 2727e97b8daSDavid Sterba | BTRFS_INODE_NODATASUM); 2737e97b8daSDavid Sterba } else { 2745c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_NODATACOW; 2757e97b8daSDavid Sterba } 2767e97b8daSDavid Sterba } 2776cbff00fSChristoph Hellwig 27875e7cb7fSLiu Bo /* 27975e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 28075e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 28175e7cb7fSLiu Bo * things smaller. 28275e7cb7fSLiu Bo */ 2835c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 2845c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_COMPRESS; 2855c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_NOCOMPRESS; 28663541927SFilipe David Borba Manana 28763541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 28863541927SFilipe David Borba Manana if (ret && ret != -ENODATA) 28963541927SFilipe David Borba Manana goto out_drop; 2905c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 29163541927SFilipe David Borba Manana const char *comp; 29263541927SFilipe David Borba Manana 293eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 294eede2bf3SOmar Sandoval ret = -ETXTBSY; 295eede2bf3SOmar Sandoval goto out_unlock; 296eede2bf3SOmar Sandoval } 297eede2bf3SOmar Sandoval 2985c57b8b6SDavid Sterba binode->flags |= BTRFS_INODE_COMPRESS; 2995c57b8b6SDavid Sterba binode->flags &= ~BTRFS_INODE_NOCOMPRESS; 30063541927SFilipe David Borba Manana 30193370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 30293370509SDavid Sterba if (!comp || comp[0] == 0) 30393370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 30493370509SDavid Sterba 30563541927SFilipe David Borba Manana ret = btrfs_set_prop(inode, "btrfs.compression", 30663541927SFilipe David Borba Manana comp, strlen(comp), 0); 30763541927SFilipe David Borba Manana if (ret) 30863541927SFilipe David Borba Manana goto out_drop; 30963541927SFilipe David Borba Manana 310ebcb904dSLi Zefan } else { 31178a017a2SFilipe Manana ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); 31278a017a2SFilipe Manana if (ret && ret != -ENODATA) 31378a017a2SFilipe Manana goto out_drop; 3145c57b8b6SDavid Sterba binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 31575e7cb7fSLiu Bo } 3166cbff00fSChristoph Hellwig 3174da6f1a3SLi Zefan trans = btrfs_start_transaction(root, 1); 318f062abf0SLi Zefan if (IS_ERR(trans)) { 319f062abf0SLi Zefan ret = PTR_ERR(trans); 320f062abf0SLi Zefan goto out_drop; 321f062abf0SLi Zefan } 3226cbff00fSChristoph Hellwig 3237b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3240c4d2d95SJosef Bacik inode_inc_iversion(inode); 325c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3266cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3276cbff00fSChristoph Hellwig 3283a45bb20SJeff Mahoney btrfs_end_transaction(trans); 329f062abf0SLi Zefan out_drop: 330f062abf0SLi Zefan if (ret) { 3315c57b8b6SDavid Sterba binode->flags = old_flags; 3325c57b8b6SDavid Sterba inode->i_flags = old_i_flags; 333f062abf0SLi Zefan } 3346cbff00fSChristoph Hellwig 3356cbff00fSChristoph Hellwig out_unlock: 3365955102cSAl Viro inode_unlock(inode); 337e7848683SJan Kara mnt_drop_write_file(file); 3382d4e6f6aSliubo return ret; 3396cbff00fSChristoph Hellwig } 3406cbff00fSChristoph Hellwig 34119f93b3cSDavid Sterba /* 34219f93b3cSDavid Sterba * Translate btrfs internal inode flags to xflags as expected by the 34319f93b3cSDavid Sterba * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are 34419f93b3cSDavid Sterba * silently dropped. 34519f93b3cSDavid Sterba */ 34619f93b3cSDavid Sterba static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) 34719f93b3cSDavid Sterba { 34819f93b3cSDavid Sterba unsigned int xflags = 0; 34919f93b3cSDavid Sterba 35019f93b3cSDavid Sterba if (flags & BTRFS_INODE_APPEND) 35119f93b3cSDavid Sterba xflags |= FS_XFLAG_APPEND; 35219f93b3cSDavid Sterba if (flags & BTRFS_INODE_IMMUTABLE) 35319f93b3cSDavid Sterba xflags |= FS_XFLAG_IMMUTABLE; 35419f93b3cSDavid Sterba if (flags & BTRFS_INODE_NOATIME) 35519f93b3cSDavid Sterba xflags |= FS_XFLAG_NOATIME; 35619f93b3cSDavid Sterba if (flags & BTRFS_INODE_NODUMP) 35719f93b3cSDavid Sterba xflags |= FS_XFLAG_NODUMP; 35819f93b3cSDavid Sterba if (flags & BTRFS_INODE_SYNC) 35919f93b3cSDavid Sterba xflags |= FS_XFLAG_SYNC; 36019f93b3cSDavid Sterba 36119f93b3cSDavid Sterba return xflags; 36219f93b3cSDavid Sterba } 36319f93b3cSDavid Sterba 36419f93b3cSDavid Sterba /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ 36519f93b3cSDavid Sterba static int check_xflags(unsigned int flags) 36619f93b3cSDavid Sterba { 36719f93b3cSDavid Sterba if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | 36819f93b3cSDavid Sterba FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) 36919f93b3cSDavid Sterba return -EOPNOTSUPP; 37019f93b3cSDavid Sterba return 0; 37119f93b3cSDavid Sterba } 37219f93b3cSDavid Sterba 373e4202ac9SDavid Sterba /* 374e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 375e4202ac9SDavid Sterba * are zeroed. 376e4202ac9SDavid Sterba */ 377e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 378e4202ac9SDavid Sterba { 379e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 380e4202ac9SDavid Sterba struct fsxattr fa; 381e4202ac9SDavid Sterba 382e4202ac9SDavid Sterba memset(&fa, 0, sizeof(fa)); 383e4202ac9SDavid Sterba fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags); 384e4202ac9SDavid Sterba 385e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 386e4202ac9SDavid Sterba return -EFAULT; 387e4202ac9SDavid Sterba 388e4202ac9SDavid Sterba return 0; 389e4202ac9SDavid Sterba } 390e4202ac9SDavid Sterba 391025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 392025f2121SDavid Sterba { 393025f2121SDavid Sterba struct inode *inode = file_inode(file); 394025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 395025f2121SDavid Sterba struct btrfs_root *root = binode->root; 396025f2121SDavid Sterba struct btrfs_trans_handle *trans; 397025f2121SDavid Sterba struct fsxattr fa; 398025f2121SDavid Sterba unsigned old_flags; 399025f2121SDavid Sterba unsigned old_i_flags; 400025f2121SDavid Sterba int ret = 0; 401025f2121SDavid Sterba 402025f2121SDavid Sterba if (!inode_owner_or_capable(inode)) 403025f2121SDavid Sterba return -EPERM; 404025f2121SDavid Sterba 405025f2121SDavid Sterba if (btrfs_root_readonly(root)) 406025f2121SDavid Sterba return -EROFS; 407025f2121SDavid Sterba 408025f2121SDavid Sterba memset(&fa, 0, sizeof(fa)); 409025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 410025f2121SDavid Sterba return -EFAULT; 411025f2121SDavid Sterba 412025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 413025f2121SDavid Sterba if (ret) 414025f2121SDavid Sterba return ret; 415025f2121SDavid Sterba 416025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 417025f2121SDavid Sterba return -EOPNOTSUPP; 418025f2121SDavid Sterba 419025f2121SDavid Sterba ret = mnt_want_write_file(file); 420025f2121SDavid Sterba if (ret) 421025f2121SDavid Sterba return ret; 422025f2121SDavid Sterba 423025f2121SDavid Sterba inode_lock(inode); 424025f2121SDavid Sterba 425025f2121SDavid Sterba old_flags = binode->flags; 426025f2121SDavid Sterba old_i_flags = inode->i_flags; 427025f2121SDavid Sterba 428025f2121SDavid Sterba /* We need the capabilities to change append-only or immutable inode */ 429025f2121SDavid Sterba if (((old_flags & (BTRFS_INODE_APPEND | BTRFS_INODE_IMMUTABLE)) || 430025f2121SDavid Sterba (fa.fsx_xflags & (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE))) && 431025f2121SDavid Sterba !capable(CAP_LINUX_IMMUTABLE)) { 432025f2121SDavid Sterba ret = -EPERM; 433025f2121SDavid Sterba goto out_unlock; 434025f2121SDavid Sterba } 435025f2121SDavid Sterba 436025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 437025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 438025f2121SDavid Sterba else 439025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 440025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 441025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 442025f2121SDavid Sterba else 443025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 444025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 445025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 446025f2121SDavid Sterba else 447025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 448025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 449025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 450025f2121SDavid Sterba else 451025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 452025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 453025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 454025f2121SDavid Sterba else 455025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 456025f2121SDavid Sterba 457025f2121SDavid Sterba /* 1 item for the inode */ 458025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 459025f2121SDavid Sterba if (IS_ERR(trans)) { 460025f2121SDavid Sterba ret = PTR_ERR(trans); 461025f2121SDavid Sterba goto out_unlock; 462025f2121SDavid Sterba } 463025f2121SDavid Sterba 464025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 465025f2121SDavid Sterba inode_inc_iversion(inode); 466025f2121SDavid Sterba inode->i_ctime = current_time(inode); 467025f2121SDavid Sterba ret = btrfs_update_inode(trans, root, inode); 468025f2121SDavid Sterba 469025f2121SDavid Sterba btrfs_end_transaction(trans); 470025f2121SDavid Sterba 471025f2121SDavid Sterba out_unlock: 472025f2121SDavid Sterba if (ret) { 473025f2121SDavid Sterba binode->flags = old_flags; 474025f2121SDavid Sterba inode->i_flags = old_i_flags; 475025f2121SDavid Sterba } 476025f2121SDavid Sterba 477025f2121SDavid Sterba inode_unlock(inode); 478025f2121SDavid Sterba mnt_drop_write_file(file); 479025f2121SDavid Sterba 480025f2121SDavid Sterba return ret; 481025f2121SDavid Sterba } 482025f2121SDavid Sterba 4836cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4846cbff00fSChristoph Hellwig { 485496ad9aaSAl Viro struct inode *inode = file_inode(file); 4866cbff00fSChristoph Hellwig 4876cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4886cbff00fSChristoph Hellwig } 489f46b5a66SChristoph Hellwig 490f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 491f7039b1dSLi Dongyang { 4920b246afaSJeff Mahoney struct inode *inode = file_inode(file); 4930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 494f7039b1dSLi Dongyang struct btrfs_device *device; 495f7039b1dSLi Dongyang struct request_queue *q; 496f7039b1dSLi Dongyang struct fstrim_range range; 497f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 498f7039b1dSLi Dongyang u64 num_devices = 0; 499f7039b1dSLi Dongyang int ret; 500f7039b1dSLi Dongyang 501f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 502f7039b1dSLi Dongyang return -EPERM; 503f7039b1dSLi Dongyang 5041f78160cSXiao Guangrong rcu_read_lock(); 5051f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5061f78160cSXiao Guangrong dev_list) { 507f7039b1dSLi Dongyang if (!device->bdev) 508f7039b1dSLi Dongyang continue; 509f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 510f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 511f7039b1dSLi Dongyang num_devices++; 51250d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 513f7039b1dSLi Dongyang minlen); 514f7039b1dSLi Dongyang } 515f7039b1dSLi Dongyang } 5161f78160cSXiao Guangrong rcu_read_unlock(); 517f4c697e6SLukas Czerner 518f7039b1dSLi Dongyang if (!num_devices) 519f7039b1dSLi Dongyang return -EOPNOTSUPP; 520f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 521f7039b1dSLi Dongyang return -EFAULT; 5226ba9fc8eSQu Wenruo 5236ba9fc8eSQu Wenruo /* 5246ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5256ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5266ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5276ba9fc8eSQu Wenruo */ 5286ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 529f4c697e6SLukas Czerner return -EINVAL; 530f7039b1dSLi Dongyang 531f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5322ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 533f7039b1dSLi Dongyang if (ret < 0) 534f7039b1dSLi Dongyang return ret; 535f7039b1dSLi Dongyang 536f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 537f7039b1dSLi Dongyang return -EFAULT; 538f7039b1dSLi Dongyang 539f7039b1dSLi Dongyang return 0; 540f7039b1dSLi Dongyang } 541f7039b1dSLi Dongyang 542dd5f9615SStefan Behrens int btrfs_is_empty_uuid(u8 *uuid) 543dd5f9615SStefan Behrens { 54446e0f66aSChris Mason int i; 54546e0f66aSChris Mason 54646e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54746e0f66aSChris Mason if (uuid[i]) 54846e0f66aSChris Mason return 0; 54946e0f66aSChris Mason } 55046e0f66aSChris Mason return 1; 551dd5f9615SStefan Behrens } 552dd5f9615SStefan Behrens 553d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 554cb8e7090SChristoph Hellwig struct dentry *dentry, 55552f75f4fSDavid Sterba const char *name, int namelen, 5566f72c7e2SArne Jansen u64 *async_transid, 5578696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 558f46b5a66SChristoph Hellwig { 5590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 560f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 561f46b5a66SChristoph Hellwig struct btrfs_key key; 56249a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 563f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 564f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 565d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 56676dda93cSYan, Zheng struct btrfs_root *new_root; 567d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 56895582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5695662344bSTsutomu Itoh struct inode *inode; 570f46b5a66SChristoph Hellwig int ret; 571f46b5a66SChristoph Hellwig int err; 572f46b5a66SChristoph Hellwig u64 objectid; 573f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 5743de4586cSChris Mason u64 index = 0; 5758ea05e3aSAlexander Block uuid_le new_uuid; 576f46b5a66SChristoph Hellwig 57749a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 57849a3c4d9SDavid Sterba if (!root_item) 57949a3c4d9SDavid Sterba return -ENOMEM; 58049a3c4d9SDavid Sterba 5810b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 5822fbe8c8aSAl Viro if (ret) 58349a3c4d9SDavid Sterba goto fail_free; 5846a912213SJosef Bacik 585e09fe2d2SQu Wenruo /* 586e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 58701327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 588e09fe2d2SQu Wenruo */ 58949a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 59049a3c4d9SDavid Sterba ret = -ENOSPC; 59149a3c4d9SDavid Sterba goto fail_free; 59249a3c4d9SDavid Sterba } 593e09fe2d2SQu Wenruo 594d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5959ed74f2dSJosef Bacik /* 596d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 597d5c12070SMiao Xie * of create_snapshot(). 5989ed74f2dSJosef Bacik */ 599c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 600d5c12070SMiao Xie if (ret) 60149a3c4d9SDavid Sterba goto fail_free; 602f46b5a66SChristoph Hellwig 603d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 604d5c12070SMiao Xie if (IS_ERR(trans)) { 605d5c12070SMiao Xie ret = PTR_ERR(trans); 6067775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 60749a3c4d9SDavid Sterba goto fail_free; 608d5c12070SMiao Xie } 609d5c12070SMiao Xie trans->block_rsv = &block_rsv; 610d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 611f46b5a66SChristoph Hellwig 612a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6136f72c7e2SArne Jansen if (ret) 6146f72c7e2SArne Jansen goto fail; 6156f72c7e2SArne Jansen 6164d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 6178e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6188e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6198e8a1e31SJosef Bacik goto fail; 6208e8a1e31SJosef Bacik } 621f46b5a66SChristoph Hellwig 622f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 623f46b5a66SChristoph Hellwig 62449a3c4d9SDavid Sterba inode_item = &root_item->inode; 6253cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6263cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6273cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 628da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6290b246afaSJeff Mahoney fs_info->nodesize); 6303cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 631f46b5a66SChristoph Hellwig 63249a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 63349a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6343cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 63508fe4db1SLi Zefan 63649a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 63749a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 63849a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 63949a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 64049a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 64149a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 642f46b5a66SChristoph Hellwig 64349a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 64449a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 6458ea05e3aSAlexander Block uuid_le_gen(&new_uuid); 64649a3c4d9SDavid Sterba memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); 64749a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 64849a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 64949a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 65049a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 65149a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 652f46b5a66SChristoph Hellwig 653925baeddSChris Mason btrfs_tree_unlock(leaf); 654f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 655f46b5a66SChristoph Hellwig leaf = NULL; 656f46b5a66SChristoph Hellwig 65749a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 658f46b5a66SChristoph Hellwig 659f46b5a66SChristoph Hellwig key.objectid = objectid; 6605d4f98a2SYan Zheng key.offset = 0; 661962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6620b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 66349a3c4d9SDavid Sterba root_item); 664f46b5a66SChristoph Hellwig if (ret) 665f46b5a66SChristoph Hellwig goto fail; 666f46b5a66SChristoph Hellwig 66776dda93cSYan, Zheng key.offset = (u64)-1; 6680b246afaSJeff Mahoney new_root = btrfs_read_fs_root_no_name(fs_info, &key); 66979787eaaSJeff Mahoney if (IS_ERR(new_root)) { 67079787eaaSJeff Mahoney ret = PTR_ERR(new_root); 67166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 67279787eaaSJeff Mahoney goto fail; 67379787eaaSJeff Mahoney } 67476dda93cSYan, Zheng 67576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 67676dda93cSYan, Zheng 67763541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 678ce598979SMark Fasheh if (ret) { 679ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 68066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 681ce598979SMark Fasheh goto fail; 682ce598979SMark Fasheh } 683ce598979SMark Fasheh 684f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 685f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 686f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 687f32e48e9SChandan Rajendra 688f46b5a66SChristoph Hellwig /* 689f46b5a66SChristoph Hellwig * insert the directory item 690f46b5a66SChristoph Hellwig */ 691877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 69279787eaaSJeff Mahoney if (ret) { 69366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 69479787eaaSJeff Mahoney goto fail; 69579787eaaSJeff Mahoney } 6963de4586cSChris Mason 697684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6983de4586cSChris Mason BTRFS_FT_DIR, index); 69979787eaaSJeff Mahoney if (ret) { 70066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 701f46b5a66SChristoph Hellwig goto fail; 70279787eaaSJeff Mahoney } 7030660b5afSChris Mason 7046ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 70552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 70652c26179SYan Zheng BUG_ON(ret); 70752c26179SYan Zheng 7086025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7094a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 7100660b5afSChris Mason BUG_ON(ret); 7110660b5afSChris Mason 712cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7136bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 714dd5f9615SStefan Behrens if (ret) 71566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 716dd5f9615SStefan Behrens 717f46b5a66SChristoph Hellwig fail: 71849a3c4d9SDavid Sterba kfree(root_item); 719d5c12070SMiao Xie trans->block_rsv = NULL; 720d5c12070SMiao Xie trans->bytes_reserved = 0; 7217775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 722de6e8200SLiu Bo 72372fd032eSSage Weil if (async_transid) { 72472fd032eSSage Weil *async_transid = trans->transid; 7253a45bb20SJeff Mahoney err = btrfs_commit_transaction_async(trans, 1); 72600d71c9cSMiao Xie if (err) 7273a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 72872fd032eSSage Weil } else { 7293a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 73072fd032eSSage Weil } 731f46b5a66SChristoph Hellwig if (err && !ret) 732f46b5a66SChristoph Hellwig ret = err; 7331a65e24bSChris Mason 7345662344bSTsutomu Itoh if (!ret) { 7355662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 736de6e8200SLiu Bo if (IS_ERR(inode)) 737de6e8200SLiu Bo return PTR_ERR(inode); 7385662344bSTsutomu Itoh d_instantiate(dentry, inode); 7395662344bSTsutomu Itoh } 740f46b5a66SChristoph Hellwig return ret; 74149a3c4d9SDavid Sterba 74249a3c4d9SDavid Sterba fail_free: 74349a3c4d9SDavid Sterba kfree(root_item); 74449a3c4d9SDavid Sterba return ret; 745f46b5a66SChristoph Hellwig } 746f46b5a66SChristoph Hellwig 747e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 74861d7e4cbSDavid Sterba struct dentry *dentry, 749e9662f70SMiao Xie u64 *async_transid, bool readonly, 750e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 751f46b5a66SChristoph Hellwig { 7520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7532e4bfab9SYan, Zheng struct inode *inode; 754f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 755f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7562e4bfab9SYan, Zheng int ret; 7578ecebf4dSRobbie Ko bool snapshot_force_cow = false; 758f46b5a66SChristoph Hellwig 75927cdeb70SMiao Xie if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) 760f46b5a66SChristoph Hellwig return -EINVAL; 761f46b5a66SChristoph Hellwig 762eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 763eede2bf3SOmar Sandoval btrfs_warn(fs_info, 764eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 765eede2bf3SOmar Sandoval return -ETXTBSY; 766eede2bf3SOmar Sandoval } 767eede2bf3SOmar Sandoval 76823269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 769a1ee7362SDavid Sterba if (!pending_snapshot) 770a1ee7362SDavid Sterba return -ENOMEM; 771a1ee7362SDavid Sterba 772b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 77323269bf5SDavid Sterba GFP_KERNEL); 7748546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7758546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 776b0c0ea63SDavid Sterba ret = -ENOMEM; 777b0c0ea63SDavid Sterba goto free_pending; 778b0c0ea63SDavid Sterba } 779b0c0ea63SDavid Sterba 7808ecebf4dSRobbie Ko /* 7818ecebf4dSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 7828ecebf4dSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 7838ecebf4dSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 7848ecebf4dSRobbie Ko */ 785ea14b57fSDavid Sterba atomic_inc(&root->will_be_snapshotted); 7864e857c58SPeter Zijlstra smp_mb__after_atomic(); 78745bac0f3SLiu Bo /* wait for no snapshot writes */ 78845bac0f3SLiu Bo wait_event(root->subv_writers->wait, 78945bac0f3SLiu Bo percpu_counter_sum(&root->subv_writers->counter) == 0); 7908257b2dcSMiao Xie 7913cd24c69SEthan Lien ret = btrfs_start_delalloc_snapshot(root); 7926a03843dSMiao Xie if (ret) 793a1ee7362SDavid Sterba goto dec_and_free; 7946a03843dSMiao Xie 7958ecebf4dSRobbie Ko /* 7968ecebf4dSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 7978ecebf4dSRobbie Ko * we force future writes to fallback to COW mode during snapshot 7988ecebf4dSRobbie Ko * creation. 7998ecebf4dSRobbie Ko */ 8008ecebf4dSRobbie Ko atomic_inc(&root->snapshot_force_cow); 8018ecebf4dSRobbie Ko snapshot_force_cow = true; 8028ecebf4dSRobbie Ko 8036374e57aSChris Mason btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 8046a03843dSMiao Xie 80566d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 807d5c12070SMiao Xie /* 808d5c12070SMiao Xie * 1 - parent dir inode 809d5c12070SMiao Xie * 2 - dir entries 810d5c12070SMiao Xie * 1 - root item 811d5c12070SMiao Xie * 2 - root ref/backref 812d5c12070SMiao Xie * 1 - root of snapshot 813dd5f9615SStefan Behrens * 1 - UUID item 814d5c12070SMiao Xie */ 815d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 816dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 817ee3441b4SJeff Mahoney false); 818d5c12070SMiao Xie if (ret) 819a1ee7362SDavid Sterba goto dec_and_free; 820d5c12070SMiao Xie 821a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 822a22285a6SYan, Zheng pending_snapshot->root = root; 823b83cc969SLi Zefan pending_snapshot->readonly = readonly; 824e9662f70SMiao Xie pending_snapshot->dir = dir; 8258696c533SMiao Xie pending_snapshot->inherit = inherit; 826a22285a6SYan, Zheng 827d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 828a22285a6SYan, Zheng if (IS_ERR(trans)) { 829a22285a6SYan, Zheng ret = PTR_ERR(trans); 830a22285a6SYan, Zheng goto fail; 831a22285a6SYan, Zheng } 832a22285a6SYan, Zheng 8330b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 834a22285a6SYan, Zheng list_add(&pending_snapshot->list, 835a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8360b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 83772fd032eSSage Weil if (async_transid) { 83872fd032eSSage Weil *async_transid = trans->transid; 8393a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 1); 84000d71c9cSMiao Xie if (ret) 8413a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 84272fd032eSSage Weil } else { 8433a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 84472fd032eSSage Weil } 845aec8030aSMiao Xie if (ret) 846c37b2b62SJosef Bacik goto fail; 847a22285a6SYan, Zheng 848a22285a6SYan, Zheng ret = pending_snapshot->error; 849f46b5a66SChristoph Hellwig if (ret) 8502e4bfab9SYan, Zheng goto fail; 851f46b5a66SChristoph Hellwig 852d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 853d3797308SChris Mason if (ret) 854d3797308SChris Mason goto fail; 855d3797308SChris Mason 8562b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8572e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8582e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8592e4bfab9SYan, Zheng goto fail; 8602e4bfab9SYan, Zheng } 8615662344bSTsutomu Itoh 8622e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8632e4bfab9SYan, Zheng ret = 0; 8642e4bfab9SYan, Zheng fail: 8657775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv); 866a1ee7362SDavid Sterba dec_and_free: 8678ecebf4dSRobbie Ko if (snapshot_force_cow) 8688ecebf4dSRobbie Ko atomic_dec(&root->snapshot_force_cow); 869ea14b57fSDavid Sterba if (atomic_dec_and_test(&root->will_be_snapshotted)) 8704625956aSPeter Zijlstra wake_up_var(&root->will_be_snapshotted); 871b0c0ea63SDavid Sterba free_pending: 872b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8738546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 874a1ee7362SDavid Sterba kfree(pending_snapshot); 875a1ee7362SDavid Sterba 876f46b5a66SChristoph Hellwig return ret; 877f46b5a66SChristoph Hellwig } 878f46b5a66SChristoph Hellwig 8794260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8804260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8814260f7c7SSage Weil * whether the type of victim is right. 8824260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8834260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8844260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8854260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8864260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8874260f7c7SSage Weil * a. be owner of dir, or 8884260f7c7SSage Weil * b. be owner of victim, or 8894260f7c7SSage Weil * c. have CAP_FOWNER capability 89001327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8914260f7c7SSage Weil * links pointing to it. 8924260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8934260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8944260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8954260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8964260f7c7SSage Weil * nfs_async_unlink(). 8974260f7c7SSage Weil */ 8984260f7c7SSage Weil 8994260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9004260f7c7SSage Weil { 9014260f7c7SSage Weil int error; 9024260f7c7SSage Weil 9032b0143b5SDavid Howells if (d_really_is_negative(victim)) 9044260f7c7SSage Weil return -ENOENT; 9054260f7c7SSage Weil 9062b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9074fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9084260f7c7SSage Weil 9094260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9104260f7c7SSage Weil if (error) 9114260f7c7SSage Weil return error; 9124260f7c7SSage Weil if (IS_APPEND(dir)) 9134260f7c7SSage Weil return -EPERM; 9142b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9152b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9164260f7c7SSage Weil return -EPERM; 9174260f7c7SSage Weil if (isdir) { 918e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9194260f7c7SSage Weil return -ENOTDIR; 9204260f7c7SSage Weil if (IS_ROOT(victim)) 9214260f7c7SSage Weil return -EBUSY; 922e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9234260f7c7SSage Weil return -EISDIR; 9244260f7c7SSage Weil if (IS_DEADDIR(dir)) 9254260f7c7SSage Weil return -ENOENT; 9264260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9274260f7c7SSage Weil return -EBUSY; 9284260f7c7SSage Weil return 0; 9294260f7c7SSage Weil } 9304260f7c7SSage Weil 931cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 932cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 933cb8e7090SChristoph Hellwig { 9342b0143b5SDavid Howells if (d_really_is_positive(child)) 935cb8e7090SChristoph Hellwig return -EEXIST; 936cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 937cb8e7090SChristoph Hellwig return -ENOENT; 938cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 939cb8e7090SChristoph Hellwig } 940cb8e7090SChristoph Hellwig 941cb8e7090SChristoph Hellwig /* 942cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 943cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 944cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 945cb8e7090SChristoph Hellwig */ 94692872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 94752f75f4fSDavid Sterba const char *name, int namelen, 94872fd032eSSage Weil struct btrfs_root *snap_src, 9496f72c7e2SArne Jansen u64 *async_transid, bool readonly, 9508696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 951cb8e7090SChristoph Hellwig { 9522b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9530b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 954cb8e7090SChristoph Hellwig struct dentry *dentry; 955cb8e7090SChristoph Hellwig int error; 956cb8e7090SChristoph Hellwig 95700235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 95800235411SAl Viro if (error == -EINTR) 95900235411SAl Viro return error; 960cb8e7090SChristoph Hellwig 961cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 962cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 963cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 964cb8e7090SChristoph Hellwig goto out_unlock; 965cb8e7090SChristoph Hellwig 96676dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 967cb8e7090SChristoph Hellwig if (error) 968a874a63eSLiu Bo goto out_dput; 969cb8e7090SChristoph Hellwig 9709c52057cSChris Mason /* 9719c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9729c52057cSChris Mason * check for them now when we can safely fail 9739c52057cSChris Mason */ 9749c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9759c52057cSChris Mason dir->i_ino, name, 9769c52057cSChris Mason namelen); 9779c52057cSChris Mason if (error) 9789c52057cSChris Mason goto out_dput; 9799c52057cSChris Mason 9800b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 98176dda93cSYan, Zheng 98276dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98376dda93cSYan, Zheng goto out_up_read; 98476dda93cSYan, Zheng 9853de4586cSChris Mason if (snap_src) { 98661d7e4cbSDavid Sterba error = create_snapshot(snap_src, dir, dentry, 9876f72c7e2SArne Jansen async_transid, readonly, inherit); 9883de4586cSChris Mason } else { 989d5c12070SMiao Xie error = create_subvol(dir, dentry, name, namelen, 990d5c12070SMiao Xie async_transid, inherit); 9913de4586cSChris Mason } 99276dda93cSYan, Zheng if (!error) 99376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99476dda93cSYan, Zheng out_up_read: 9950b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 996cb8e7090SChristoph Hellwig out_dput: 997cb8e7090SChristoph Hellwig dput(dentry); 998cb8e7090SChristoph Hellwig out_unlock: 9995955102cSAl Viro inode_unlock(dir); 1000cb8e7090SChristoph Hellwig return error; 1001cb8e7090SChristoph Hellwig } 1002cb8e7090SChristoph Hellwig 10034cb5300bSChris Mason /* 10044cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10054cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10064cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10074cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10084cb5300bSChris Mason * part of the file 10094cb5300bSChris Mason */ 1010aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10114cb5300bSChris Mason { 10124cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10134cb5300bSChris Mason struct extent_map *em = NULL; 10144cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10154cb5300bSChris Mason u64 end; 10164cb5300bSChris Mason 10174cb5300bSChris Mason read_lock(&em_tree->lock); 101809cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10194cb5300bSChris Mason read_unlock(&em_tree->lock); 10204cb5300bSChris Mason 10214cb5300bSChris Mason if (em) { 10224cb5300bSChris Mason end = extent_map_end(em); 10234cb5300bSChris Mason free_extent_map(em); 10244cb5300bSChris Mason if (end - offset > thresh) 10254cb5300bSChris Mason return 0; 10264cb5300bSChris Mason } 10274cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10284cb5300bSChris Mason thresh /= 2; 10294cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10304cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10314cb5300bSChris Mason if (end >= thresh) 10324cb5300bSChris Mason return 0; 10334cb5300bSChris Mason return 1; 10344cb5300bSChris Mason } 10354cb5300bSChris Mason 10364cb5300bSChris Mason /* 10374cb5300bSChris Mason * helper function to walk through a file and find extents 10384cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10394cb5300bSChris Mason * 10404cb5300bSChris Mason * This is used by the defragging code to find new and small 10414cb5300bSChris Mason * extents 10424cb5300bSChris Mason */ 10434cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10444cb5300bSChris Mason struct inode *inode, u64 newer_than, 1045aab110abSDavid Sterba u64 *off, u32 thresh) 10464cb5300bSChris Mason { 10474cb5300bSChris Mason struct btrfs_path *path; 10484cb5300bSChris Mason struct btrfs_key min_key; 10494cb5300bSChris Mason struct extent_buffer *leaf; 10504cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10514cb5300bSChris Mason int type; 10524cb5300bSChris Mason int ret; 10534a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10544cb5300bSChris Mason 10554cb5300bSChris Mason path = btrfs_alloc_path(); 10564cb5300bSChris Mason if (!path) 10574cb5300bSChris Mason return -ENOMEM; 10584cb5300bSChris Mason 1059a4689d2bSDavid Sterba min_key.objectid = ino; 10604cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10614cb5300bSChris Mason min_key.offset = *off; 10624cb5300bSChris Mason 10634cb5300bSChris Mason while (1) { 10646174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10654cb5300bSChris Mason if (ret != 0) 10664cb5300bSChris Mason goto none; 1067f094c9bdSFilipe Manana process_slot: 1068a4689d2bSDavid Sterba if (min_key.objectid != ino) 10694cb5300bSChris Mason goto none; 10704cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10714cb5300bSChris Mason goto none; 10724cb5300bSChris Mason 10734cb5300bSChris Mason leaf = path->nodes[0]; 10744cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10754cb5300bSChris Mason struct btrfs_file_extent_item); 10764cb5300bSChris Mason 10774cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10784cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10794cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10804cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10814cb5300bSChris Mason *off = min_key.offset; 10824cb5300bSChris Mason btrfs_free_path(path); 10834cb5300bSChris Mason return 0; 10844cb5300bSChris Mason } 10854cb5300bSChris Mason 1086f094c9bdSFilipe Manana path->slots[0]++; 1087f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1088f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1089f094c9bdSFilipe Manana goto process_slot; 1090f094c9bdSFilipe Manana } 1091f094c9bdSFilipe Manana 10924cb5300bSChris Mason if (min_key.offset == (u64)-1) 10934cb5300bSChris Mason goto none; 10944cb5300bSChris Mason 10954cb5300bSChris Mason min_key.offset++; 10964cb5300bSChris Mason btrfs_release_path(path); 10974cb5300bSChris Mason } 10984cb5300bSChris Mason none: 10994cb5300bSChris Mason btrfs_free_path(path); 11004cb5300bSChris Mason return -ENOENT; 11014cb5300bSChris Mason } 11024cb5300bSChris Mason 11036c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 110417ce6ef8SLiu Bo { 110517ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1106940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11076c282eb4SLi Zefan struct extent_map *em; 110809cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1109940100a4SChris Mason 1110940100a4SChris Mason /* 1111940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1112940100a4SChris Mason * the full extent lock 1113940100a4SChris Mason */ 1114940100a4SChris Mason read_lock(&em_tree->lock); 1115940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1116940100a4SChris Mason read_unlock(&em_tree->lock); 1117940100a4SChris Mason 1118940100a4SChris Mason if (!em) { 1119308d9800SFilipe Manana struct extent_state *cached = NULL; 1120308d9800SFilipe Manana u64 end = start + len - 1; 1121308d9800SFilipe Manana 1122940100a4SChris Mason /* get the big lock and read metadata off disk */ 1123ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 1124fc4f21b1SNikolay Borisov em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0); 1125e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1126940100a4SChris Mason 11276cf8bfbfSDan Carpenter if (IS_ERR(em)) 11286c282eb4SLi Zefan return NULL; 1129940100a4SChris Mason } 1130940100a4SChris Mason 11316c282eb4SLi Zefan return em; 11326c282eb4SLi Zefan } 11336c282eb4SLi Zefan 11346c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11356c282eb4SLi Zefan { 11366c282eb4SLi Zefan struct extent_map *next; 11376c282eb4SLi Zefan bool ret = true; 11386c282eb4SLi Zefan 11396c282eb4SLi Zefan /* this is the last extent */ 11406c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11416c282eb4SLi Zefan return false; 11426c282eb4SLi Zefan 11436c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1144e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1145e9512d72SChris Mason ret = false; 1146e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1147ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11486c282eb4SLi Zefan ret = false; 11496c282eb4SLi Zefan 11506c282eb4SLi Zefan free_extent_map(next); 11516c282eb4SLi Zefan return ret; 11526c282eb4SLi Zefan } 11536c282eb4SLi Zefan 1154aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1155a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1156a43a2111SAndrew Mahone int compress) 11576c282eb4SLi Zefan { 11586c282eb4SLi Zefan struct extent_map *em; 11596c282eb4SLi Zefan int ret = 1; 11606c282eb4SLi Zefan bool next_mergeable = true; 11614a3560c4SLiu Bo bool prev_mergeable = true; 11626c282eb4SLi Zefan 11636c282eb4SLi Zefan /* 11646c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11656c282eb4SLi Zefan * defragging it 11666c282eb4SLi Zefan */ 11676c282eb4SLi Zefan if (start < *defrag_end) 11686c282eb4SLi Zefan return 1; 11696c282eb4SLi Zefan 11706c282eb4SLi Zefan *skip = 0; 11716c282eb4SLi Zefan 11726c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11736c282eb4SLi Zefan if (!em) 11746c282eb4SLi Zefan return 0; 11756c282eb4SLi Zefan 1176940100a4SChris Mason /* this will cover holes, and inline extents */ 117717ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1178940100a4SChris Mason ret = 0; 117917ce6ef8SLiu Bo goto out; 118017ce6ef8SLiu Bo } 118117ce6ef8SLiu Bo 11824a3560c4SLiu Bo if (!*defrag_end) 11834a3560c4SLiu Bo prev_mergeable = false; 11844a3560c4SLiu Bo 11856c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1186940100a4SChris Mason /* 11876c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11886c282eb4SLi Zefan * real extent, don't bother defragging it 1189940100a4SChris Mason */ 1190a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11914a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1192940100a4SChris Mason ret = 0; 119317ce6ef8SLiu Bo out: 1194940100a4SChris Mason /* 1195940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1196940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1197940100a4SChris Mason * so that the next tiny extent will force a defrag. 1198940100a4SChris Mason * 1199940100a4SChris Mason * The end result of this is that tiny extents before a single big 1200940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1201940100a4SChris Mason */ 1202940100a4SChris Mason if (ret) { 1203940100a4SChris Mason *defrag_end = extent_map_end(em); 1204940100a4SChris Mason } else { 1205940100a4SChris Mason *last_len = 0; 1206940100a4SChris Mason *skip = extent_map_end(em); 1207940100a4SChris Mason *defrag_end = 0; 1208940100a4SChris Mason } 1209940100a4SChris Mason 1210940100a4SChris Mason free_extent_map(em); 1211940100a4SChris Mason return ret; 1212940100a4SChris Mason } 1213940100a4SChris Mason 12144cb5300bSChris Mason /* 12154cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12164cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12174cb5300bSChris Mason * to COW and defrag. 12184cb5300bSChris Mason * 12194cb5300bSChris Mason * It also makes sure the delalloc code has enough 12204cb5300bSChris Mason * dirty data to avoid making new small extents as part 12214cb5300bSChris Mason * of the defrag 12224cb5300bSChris Mason * 12234cb5300bSChris Mason * It's a good idea to start RA on this range 12244cb5300bSChris Mason * before calling this. 12254cb5300bSChris Mason */ 12264cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12274cb5300bSChris Mason struct page **pages, 12284cb5300bSChris Mason unsigned long start_index, 1229c41570c9SJustin Maggard unsigned long num_pages) 1230f46b5a66SChristoph Hellwig { 12314cb5300bSChris Mason unsigned long file_end; 12324cb5300bSChris Mason u64 isize = i_size_read(inode); 1233f46b5a66SChristoph Hellwig u64 page_start; 1234f46b5a66SChristoph Hellwig u64 page_end; 12351f12bd06SLiu Bo u64 page_cnt; 12364cb5300bSChris Mason int ret; 12374cb5300bSChris Mason int i; 12384cb5300bSChris Mason int i_done; 12394cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12404cb5300bSChris Mason struct extent_state *cached_state = NULL; 1241600a45e1SMiao Xie struct extent_io_tree *tree; 1242364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12433b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12444cb5300bSChris Mason 124509cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12461f12bd06SLiu Bo if (!isize || start_index > file_end) 12471f12bd06SLiu Bo return 0; 12481f12bd06SLiu Bo 12491f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12504cb5300bSChris Mason 1251364ecf36SQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, 125209cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 125309cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12544cb5300bSChris Mason if (ret) 12554cb5300bSChris Mason return ret; 12564cb5300bSChris Mason i_done = 0; 1257600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12584cb5300bSChris Mason 12594cb5300bSChris Mason /* step one, lock all the pages */ 12601f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12614cb5300bSChris Mason struct page *page; 1262600a45e1SMiao Xie again: 1263a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12643b16a4e3SJosef Bacik start_index + i, mask); 12654cb5300bSChris Mason if (!page) 12664cb5300bSChris Mason break; 12674cb5300bSChris Mason 1268600a45e1SMiao Xie page_start = page_offset(page); 126909cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1270600a45e1SMiao Xie while (1) { 1271308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1272ff13db41SDavid Sterba &cached_state); 1273600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1274600a45e1SMiao Xie page_start); 1275308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1276e43bbe5eSDavid Sterba &cached_state); 1277600a45e1SMiao Xie if (!ordered) 1278600a45e1SMiao Xie break; 1279600a45e1SMiao Xie 1280600a45e1SMiao Xie unlock_page(page); 1281600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1282600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1283600a45e1SMiao Xie lock_page(page); 12841f12bd06SLiu Bo /* 12851f12bd06SLiu Bo * we unlocked the page above, so we need check if 12861f12bd06SLiu Bo * it was released or not. 12871f12bd06SLiu Bo */ 12881f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12891f12bd06SLiu Bo unlock_page(page); 129009cbfeafSKirill A. Shutemov put_page(page); 12911f12bd06SLiu Bo goto again; 12921f12bd06SLiu Bo } 1293600a45e1SMiao Xie } 1294600a45e1SMiao Xie 12954cb5300bSChris Mason if (!PageUptodate(page)) { 12964cb5300bSChris Mason btrfs_readpage(NULL, page); 12974cb5300bSChris Mason lock_page(page); 12984cb5300bSChris Mason if (!PageUptodate(page)) { 12994cb5300bSChris Mason unlock_page(page); 130009cbfeafSKirill A. Shutemov put_page(page); 13014cb5300bSChris Mason ret = -EIO; 13024cb5300bSChris Mason break; 13034cb5300bSChris Mason } 13044cb5300bSChris Mason } 1305600a45e1SMiao Xie 1306600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1307600a45e1SMiao Xie unlock_page(page); 130809cbfeafSKirill A. Shutemov put_page(page); 1309600a45e1SMiao Xie goto again; 1310600a45e1SMiao Xie } 1311600a45e1SMiao Xie 13124cb5300bSChris Mason pages[i] = page; 13134cb5300bSChris Mason i_done++; 13144cb5300bSChris Mason } 13154cb5300bSChris Mason if (!i_done || ret) 13164cb5300bSChris Mason goto out; 13174cb5300bSChris Mason 13181751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13194cb5300bSChris Mason goto out; 13204cb5300bSChris Mason 13214cb5300bSChris Mason /* 13224cb5300bSChris Mason * so now we have a nice long stream of locked 13234cb5300bSChris Mason * and up to date pages, lets wait on them 13244cb5300bSChris Mason */ 13254cb5300bSChris Mason for (i = 0; i < i_done; i++) 13264cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13274cb5300bSChris Mason 13284cb5300bSChris Mason page_start = page_offset(pages[0]); 132909cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13304cb5300bSChris Mason 13314cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1332ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13334cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 13344cb5300bSChris Mason page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | 13359e8a4a8bSLiu Bo EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, 1336ae0f1625SDavid Sterba &cached_state); 13374cb5300bSChris Mason 13381f12bd06SLiu Bo if (i_done != page_cnt) { 13399e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 134028c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13419e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 1342bc42bda2SQu Wenruo btrfs_delalloc_release_space(inode, data_reserved, 134309cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 134443b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13454cb5300bSChris Mason } 13464cb5300bSChris Mason 13474cb5300bSChris Mason 13489e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1349018ed4f7SDavid Sterba &cached_state); 13504cb5300bSChris Mason 13514cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1352e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13534cb5300bSChris Mason 13544cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13554cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13564cb5300bSChris Mason ClearPageChecked(pages[i]); 13574cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13584cb5300bSChris Mason set_page_dirty(pages[i]); 13594cb5300bSChris Mason unlock_page(pages[i]); 136009cbfeafSKirill A. Shutemov put_page(pages[i]); 13614cb5300bSChris Mason } 136243b18595SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT, 136343b18595SQu Wenruo false); 1364364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13654cb5300bSChris Mason return i_done; 13664cb5300bSChris Mason out: 13674cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13684cb5300bSChris Mason unlock_page(pages[i]); 136909cbfeafSKirill A. Shutemov put_page(pages[i]); 13704cb5300bSChris Mason } 1371bc42bda2SQu Wenruo btrfs_delalloc_release_space(inode, data_reserved, 137209cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 137343b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 137443b18595SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT, 137543b18595SQu Wenruo true); 1376364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13774cb5300bSChris Mason return ret; 13784cb5300bSChris Mason 13794cb5300bSChris Mason } 13804cb5300bSChris Mason 13814cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13824cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13834cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13844cb5300bSChris Mason { 13850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13864cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13874cb5300bSChris Mason struct file_ra_state *ra = NULL; 13884cb5300bSChris Mason unsigned long last_index; 1389151a31b2SLi Zefan u64 isize = i_size_read(inode); 1390940100a4SChris Mason u64 last_len = 0; 1391940100a4SChris Mason u64 skip = 0; 1392940100a4SChris Mason u64 defrag_end = 0; 13934cb5300bSChris Mason u64 newer_off = range->start; 1394f46b5a66SChristoph Hellwig unsigned long i; 1395008873eaSLi Zefan unsigned long ra_index = 0; 1396f46b5a66SChristoph Hellwig int ret; 13974cb5300bSChris Mason int defrag_count = 0; 13981a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1399aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 140009cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1401c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1402ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14034cb5300bSChris Mason struct page **pages = NULL; 14041e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14054cb5300bSChris Mason 14060abd5b17SLiu Bo if (isize == 0) 14070abd5b17SLiu Bo return 0; 14080abd5b17SLiu Bo 14090abd5b17SLiu Bo if (range->start >= isize) 14100abd5b17SLiu Bo return -EINVAL; 14111a419d85SLi Zefan 14121e2ef46dSDavid Sterba if (do_compress) { 14131a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 14141a419d85SLi Zefan return -EINVAL; 14151a419d85SLi Zefan if (range->compress_type) 14161a419d85SLi Zefan compress_type = range->compress_type; 14171a419d85SLi Zefan } 1418f46b5a66SChristoph Hellwig 14190abd5b17SLiu Bo if (extent_thresh == 0) 1420ee22184bSByongho Lee extent_thresh = SZ_256K; 1421f46b5a66SChristoph Hellwig 14224cb5300bSChris Mason /* 14230a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14240a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14250a52d108SDavid Sterba * we don't error out. 14264cb5300bSChris Mason */ 14274cb5300bSChris Mason if (!file) { 142863e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14290a52d108SDavid Sterba if (ra) 14304cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14314cb5300bSChris Mason } else { 14324cb5300bSChris Mason ra = &file->f_ra; 14334cb5300bSChris Mason } 14344cb5300bSChris Mason 143563e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14364cb5300bSChris Mason if (!pages) { 14374cb5300bSChris Mason ret = -ENOMEM; 14384cb5300bSChris Mason goto out_ra; 14394cb5300bSChris Mason } 14404cb5300bSChris Mason 14414cb5300bSChris Mason /* find the last page to defrag */ 14421e701a32SChris Mason if (range->start + range->len > range->start) { 1443151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 144409cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14451e701a32SChris Mason } else { 144609cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14471e701a32SChris Mason } 14481e701a32SChris Mason 14494cb5300bSChris Mason if (newer_than) { 14504cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1451ee22184bSByongho Lee &newer_off, SZ_64K); 14524cb5300bSChris Mason if (!ret) { 14534cb5300bSChris Mason range->start = newer_off; 14544cb5300bSChris Mason /* 14554cb5300bSChris Mason * we always align our defrag to help keep 14564cb5300bSChris Mason * the extents in the file evenly spaced 14574cb5300bSChris Mason */ 145809cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14594cb5300bSChris Mason } else 14604cb5300bSChris Mason goto out_ra; 14614cb5300bSChris Mason } else { 146209cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14634cb5300bSChris Mason } 14644cb5300bSChris Mason if (!max_to_defrag) 1465070034bdSchandan max_to_defrag = last_index - i + 1; 14664cb5300bSChris Mason 14672a0f7f57SLi Zefan /* 14682a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14692a0f7f57SLi Zefan * written sequentially. 14702a0f7f57SLi Zefan */ 14712a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14722a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14732a0f7f57SLi Zefan 1474f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 147509cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14764cb5300bSChris Mason /* 14774cb5300bSChris Mason * make sure we stop running if someone unmounts 14784cb5300bSChris Mason * the FS 14794cb5300bSChris Mason */ 14801751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14814cb5300bSChris Mason break; 14824cb5300bSChris Mason 14830b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14840b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1485210549ebSDavid Sterba ret = -EAGAIN; 1486210549ebSDavid Sterba break; 1487210549ebSDavid Sterba } 1488210549ebSDavid Sterba 148909cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 14906c282eb4SLi Zefan extent_thresh, &last_len, &skip, 14911e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1492940100a4SChris Mason unsigned long next; 1493940100a4SChris Mason /* 1494940100a4SChris Mason * the should_defrag function tells us how much to skip 1495940100a4SChris Mason * bump our counter by the suggested amount 1496940100a4SChris Mason */ 149709cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1498940100a4SChris Mason i = max(i + 1, next); 1499940100a4SChris Mason continue; 1500940100a4SChris Mason } 1501008873eaSLi Zefan 1502008873eaSLi Zefan if (!newer_than) { 150309cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 150409cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1505008873eaSLi Zefan cluster = min(cluster, max_cluster); 1506008873eaSLi Zefan } else { 1507008873eaSLi Zefan cluster = max_cluster; 1508008873eaSLi Zefan } 1509008873eaSLi Zefan 1510008873eaSLi Zefan if (i + cluster > ra_index) { 1511008873eaSLi Zefan ra_index = max(i, ra_index); 15120a52d108SDavid Sterba if (ra) 1513d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1514d3c0bab5SDavid Sterba file, ra_index, cluster); 1515e4826a5bSchandan ra_index += cluster; 1516008873eaSLi Zefan } 15174cb5300bSChris Mason 15185955102cSAl Viro inode_lock(inode); 1519eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1520eede2bf3SOmar Sandoval ret = -ETXTBSY; 1521eede2bf3SOmar Sandoval } else { 15221e2ef46dSDavid Sterba if (do_compress) 1523eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1524008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1525eede2bf3SOmar Sandoval } 1526ecb8bea8SLiu Bo if (ret < 0) { 15275955102cSAl Viro inode_unlock(inode); 15284cb5300bSChris Mason goto out_ra; 1529ecb8bea8SLiu Bo } 15304cb5300bSChris Mason 15314cb5300bSChris Mason defrag_count += ret; 1532d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15335955102cSAl Viro inode_unlock(inode); 15344cb5300bSChris Mason 15354cb5300bSChris Mason if (newer_than) { 15364cb5300bSChris Mason if (newer_off == (u64)-1) 15374cb5300bSChris Mason break; 15384cb5300bSChris Mason 1539e1f041e1SLiu Bo if (ret > 0) 1540e1f041e1SLiu Bo i += ret; 1541e1f041e1SLiu Bo 15424cb5300bSChris Mason newer_off = max(newer_off + 1, 154309cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15444cb5300bSChris Mason 1545ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1546ee22184bSByongho Lee &newer_off, SZ_64K); 15474cb5300bSChris Mason if (!ret) { 15484cb5300bSChris Mason range->start = newer_off; 154909cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15504cb5300bSChris Mason } else { 15514cb5300bSChris Mason break; 1552940100a4SChris Mason } 15534cb5300bSChris Mason } else { 1554008873eaSLi Zefan if (ret > 0) { 1555cbcc8326SLi Zefan i += ret; 155609cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1557008873eaSLi Zefan } else { 1558940100a4SChris Mason i++; 1559008873eaSLi Zefan last_len = 0; 1560008873eaSLi Zefan } 1561f46b5a66SChristoph Hellwig } 15624cb5300bSChris Mason } 1563f46b5a66SChristoph Hellwig 1564dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15651e701a32SChris Mason filemap_flush(inode->i_mapping); 1566dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1567dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1568dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1569dec8ef90SFilipe Manana } 15701e701a32SChris Mason 15711a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15720b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15735c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15745c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15751a419d85SLi Zefan } 15761a419d85SLi Zefan 157760ccf82fSDiego Calleja ret = defrag_count; 1578940100a4SChris Mason 15794cb5300bSChris Mason out_ra: 15801e2ef46dSDavid Sterba if (do_compress) { 15815955102cSAl Viro inode_lock(inode); 1582eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 15835955102cSAl Viro inode_unlock(inode); 1584633085c7SFilipe David Borba Manana } 15854cb5300bSChris Mason if (!file) 15864cb5300bSChris Mason kfree(ra); 15874cb5300bSChris Mason kfree(pages); 1588940100a4SChris Mason return ret; 1589f46b5a66SChristoph Hellwig } 1590f46b5a66SChristoph Hellwig 1591198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 159276dda93cSYan, Zheng void __user *arg) 1593f46b5a66SChristoph Hellwig { 15940b246afaSJeff Mahoney struct inode *inode = file_inode(file); 15950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1596f46b5a66SChristoph Hellwig u64 new_size; 1597f46b5a66SChristoph Hellwig u64 old_size; 1598f46b5a66SChristoph Hellwig u64 devid = 1; 15990b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1600f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1601f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1602f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1603f46b5a66SChristoph Hellwig char *sizestr; 16049a40f122SGui Hecheng char *retptr; 1605f46b5a66SChristoph Hellwig char *devstr = NULL; 1606f46b5a66SChristoph Hellwig int ret = 0; 1607f46b5a66SChristoph Hellwig int mod = 0; 1608f46b5a66SChristoph Hellwig 1609e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1610e441d54dSChris Mason return -EPERM; 1611e441d54dSChris Mason 1612198605a8SMiao Xie ret = mnt_want_write_file(file); 1613198605a8SMiao Xie if (ret) 1614198605a8SMiao Xie return ret; 1615198605a8SMiao Xie 1616171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 161797547676SMiao Xie mnt_drop_write_file(file); 1618e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1619c9e9f97bSIlya Dryomov } 1620c9e9f97bSIlya Dryomov 1621dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1622c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1623c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1624c9e9f97bSIlya Dryomov goto out; 1625c9e9f97bSIlya Dryomov } 16265516e595SMark Fasheh 16275516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1628f46b5a66SChristoph Hellwig 1629f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1630f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1631f46b5a66SChristoph Hellwig if (devstr) { 1632f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1633f46b5a66SChristoph Hellwig *devstr = '\0'; 1634f46b5a66SChristoph Hellwig devstr = vol_args->name; 163558dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 163658dfae63SZhangZhen if (ret) 163758dfae63SZhangZhen goto out_free; 1638dfd79829SMiao Xie if (!devid) { 1639dfd79829SMiao Xie ret = -EINVAL; 1640dfd79829SMiao Xie goto out_free; 1641dfd79829SMiao Xie } 16420b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1643f46b5a66SChristoph Hellwig } 1644dba60f3fSMiao Xie 16450b246afaSJeff Mahoney device = btrfs_find_device(fs_info, devid, NULL, NULL); 1646f46b5a66SChristoph Hellwig if (!device) { 16470b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1648c1c9ff7cSGeert Uytterhoeven devid); 1649dfd79829SMiao Xie ret = -ENODEV; 1650c9e9f97bSIlya Dryomov goto out_free; 1651f46b5a66SChristoph Hellwig } 1652dba60f3fSMiao Xie 1653ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16540b246afaSJeff Mahoney btrfs_info(fs_info, 1655efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1656c1c9ff7cSGeert Uytterhoeven devid); 1657dfd79829SMiao Xie ret = -EPERM; 16584e42ae1bSLiu Bo goto out_free; 16594e42ae1bSLiu Bo } 16604e42ae1bSLiu Bo 1661f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1662f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1663f46b5a66SChristoph Hellwig else { 1664f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1665f46b5a66SChristoph Hellwig mod = -1; 1666f46b5a66SChristoph Hellwig sizestr++; 1667f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1668f46b5a66SChristoph Hellwig mod = 1; 1669f46b5a66SChristoph Hellwig sizestr++; 1670f46b5a66SChristoph Hellwig } 16719a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16729a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1673f46b5a66SChristoph Hellwig ret = -EINVAL; 1674c9e9f97bSIlya Dryomov goto out_free; 1675f46b5a66SChristoph Hellwig } 1676f46b5a66SChristoph Hellwig } 1677f46b5a66SChristoph Hellwig 1678401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1679dfd79829SMiao Xie ret = -EPERM; 168063a212abSStefan Behrens goto out_free; 168163a212abSStefan Behrens } 168263a212abSStefan Behrens 16837cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1684f46b5a66SChristoph Hellwig 1685f46b5a66SChristoph Hellwig if (mod < 0) { 1686f46b5a66SChristoph Hellwig if (new_size > old_size) { 1687f46b5a66SChristoph Hellwig ret = -EINVAL; 1688c9e9f97bSIlya Dryomov goto out_free; 1689f46b5a66SChristoph Hellwig } 1690f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1691f46b5a66SChristoph Hellwig } else if (mod > 0) { 1692eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1693902c68a4SGui Hecheng ret = -ERANGE; 1694eb8052e0SWenliang Fan goto out_free; 1695eb8052e0SWenliang Fan } 1696f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1697f46b5a66SChristoph Hellwig } 1698f46b5a66SChristoph Hellwig 1699ee22184bSByongho Lee if (new_size < SZ_256M) { 1700f46b5a66SChristoph Hellwig ret = -EINVAL; 1701c9e9f97bSIlya Dryomov goto out_free; 1702f46b5a66SChristoph Hellwig } 1703f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1704f46b5a66SChristoph Hellwig ret = -EFBIG; 1705c9e9f97bSIlya Dryomov goto out_free; 1706f46b5a66SChristoph Hellwig } 1707f46b5a66SChristoph Hellwig 170847f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1709f46b5a66SChristoph Hellwig 17100b246afaSJeff Mahoney btrfs_info_in_rcu(fs_info, "new size for %s is %llu", 1711c1c9ff7cSGeert Uytterhoeven rcu_str_deref(device->name), new_size); 1712f46b5a66SChristoph Hellwig 1713f46b5a66SChristoph Hellwig if (new_size > old_size) { 1714a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 171598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 171698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1717c9e9f97bSIlya Dryomov goto out_free; 171898d5dc13STsutomu Itoh } 1719f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17203a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1721ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1722f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17230253f40eSjeff.liu } /* equal, nothing need to do */ 1724f46b5a66SChristoph Hellwig 1725c9e9f97bSIlya Dryomov out_free: 1726f46b5a66SChristoph Hellwig kfree(vol_args); 1727c9e9f97bSIlya Dryomov out: 1728171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 172918f39c41SIlya Dryomov mnt_drop_write_file(file); 1730f46b5a66SChristoph Hellwig return ret; 1731f46b5a66SChristoph Hellwig } 1732f46b5a66SChristoph Hellwig 173372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 173452f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17356f72c7e2SArne Jansen u64 *transid, bool readonly, 17368696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1737f46b5a66SChristoph Hellwig { 1738f46b5a66SChristoph Hellwig int namelen; 17393de4586cSChris Mason int ret = 0; 1740f46b5a66SChristoph Hellwig 1741325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1742325c50e3SJeff Mahoney return -ENOTDIR; 1743325c50e3SJeff Mahoney 1744a874a63eSLiu Bo ret = mnt_want_write_file(file); 1745a874a63eSLiu Bo if (ret) 1746a874a63eSLiu Bo goto out; 1747a874a63eSLiu Bo 174872fd032eSSage Weil namelen = strlen(name); 174972fd032eSSage Weil if (strchr(name, '/')) { 1750f46b5a66SChristoph Hellwig ret = -EINVAL; 1751a874a63eSLiu Bo goto out_drop_write; 1752f46b5a66SChristoph Hellwig } 1753f46b5a66SChristoph Hellwig 175416780cabSChris Mason if (name[0] == '.' && 175516780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 175616780cabSChris Mason ret = -EEXIST; 1757a874a63eSLiu Bo goto out_drop_write; 175816780cabSChris Mason } 175916780cabSChris Mason 17603de4586cSChris Mason if (subvol) { 176172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17626f72c7e2SArne Jansen NULL, transid, readonly, inherit); 1763cb8e7090SChristoph Hellwig } else { 17642903ff01SAl Viro struct fd src = fdget(fd); 17653de4586cSChris Mason struct inode *src_inode; 17662903ff01SAl Viro if (!src.file) { 17673de4586cSChris Mason ret = -EINVAL; 1768a874a63eSLiu Bo goto out_drop_write; 17693de4586cSChris Mason } 17703de4586cSChris Mason 1771496ad9aaSAl Viro src_inode = file_inode(src.file); 1772496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1773c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1774efe120a0SFrank Holton "Snapshot src from another FS"); 177523ad5b17SKusanagi Kouichi ret = -EXDEV; 1776d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1777d0242061SDavid Sterba /* 1778d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1779d0242061SDavid Sterba * are limited to own subvolumes only 1780d0242061SDavid Sterba */ 1781d0242061SDavid Sterba ret = -EPERM; 1782ecd18815SAl Viro } else { 178372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 178472fd032eSSage Weil BTRFS_I(src_inode)->root, 17856f72c7e2SArne Jansen transid, readonly, inherit); 1786ecd18815SAl Viro } 17872903ff01SAl Viro fdput(src); 1788cb8e7090SChristoph Hellwig } 1789a874a63eSLiu Bo out_drop_write: 1790a874a63eSLiu Bo mnt_drop_write_file(file); 1791f46b5a66SChristoph Hellwig out: 179272fd032eSSage Weil return ret; 179372fd032eSSage Weil } 179472fd032eSSage Weil 179572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1796fa0d2b9bSLi Zefan void __user *arg, int subvol) 179772fd032eSSage Weil { 1798fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 179972fd032eSSage Weil int ret; 180072fd032eSSage Weil 1801325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1802325c50e3SJeff Mahoney return -ENOTDIR; 1803325c50e3SJeff Mahoney 1804fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1805fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1806fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1807fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1808fa0d2b9bSLi Zefan 1809fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1810b83cc969SLi Zefan vol_args->fd, subvol, 18116f72c7e2SArne Jansen NULL, false, NULL); 1812fa0d2b9bSLi Zefan 1813fa0d2b9bSLi Zefan kfree(vol_args); 1814fa0d2b9bSLi Zefan return ret; 1815fa0d2b9bSLi Zefan } 1816fa0d2b9bSLi Zefan 1817fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1818fa0d2b9bSLi Zefan void __user *arg, int subvol) 1819fa0d2b9bSLi Zefan { 1820fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1821fa0d2b9bSLi Zefan int ret; 1822fdfb1e4fSLi Zefan u64 transid = 0; 1823fdfb1e4fSLi Zefan u64 *ptr = NULL; 1824b83cc969SLi Zefan bool readonly = false; 18256f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 182672fd032eSSage Weil 1827325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1828325c50e3SJeff Mahoney return -ENOTDIR; 1829325c50e3SJeff Mahoney 1830fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1831fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1832fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1833fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1834fdfb1e4fSLi Zefan 1835b83cc969SLi Zefan if (vol_args->flags & 18366f72c7e2SArne Jansen ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | 18376f72c7e2SArne Jansen BTRFS_SUBVOL_QGROUP_INHERIT)) { 1838b83cc969SLi Zefan ret = -EOPNOTSUPP; 1839c47ca32dSDan Carpenter goto free_args; 1840fdfb1e4fSLi Zefan } 1841fdfb1e4fSLi Zefan 1842fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1843fdfb1e4fSLi Zefan ptr = &transid; 1844b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1845b83cc969SLi Zefan readonly = true; 18466f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 184709cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18486f72c7e2SArne Jansen ret = -EINVAL; 1849c47ca32dSDan Carpenter goto free_args; 18506f72c7e2SArne Jansen } 18516f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18526f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18536f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1854c47ca32dSDan Carpenter goto free_args; 18556f72c7e2SArne Jansen } 18566f72c7e2SArne Jansen } 185775eaa0e2SSage Weil 1858fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 18596f72c7e2SArne Jansen vol_args->fd, subvol, ptr, 18608696c533SMiao Xie readonly, inherit); 1861c47ca32dSDan Carpenter if (ret) 1862c47ca32dSDan Carpenter goto free_inherit; 186375eaa0e2SSage Weil 1864c47ca32dSDan Carpenter if (ptr && copy_to_user(arg + 1865fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1866c47ca32dSDan Carpenter transid), 1867c47ca32dSDan Carpenter ptr, sizeof(*ptr))) 186875eaa0e2SSage Weil ret = -EFAULT; 1869c47ca32dSDan Carpenter 1870c47ca32dSDan Carpenter free_inherit: 18716f72c7e2SArne Jansen kfree(inherit); 1872c47ca32dSDan Carpenter free_args: 1873c47ca32dSDan Carpenter kfree(vol_args); 1874f46b5a66SChristoph Hellwig return ret; 1875f46b5a66SChristoph Hellwig } 1876f46b5a66SChristoph Hellwig 18770caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18780caa102dSLi Zefan void __user *arg) 18790caa102dSLi Zefan { 1880496ad9aaSAl Viro struct inode *inode = file_inode(file); 18810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18820caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18830caa102dSLi Zefan int ret = 0; 18840caa102dSLi Zefan u64 flags = 0; 18850caa102dSLi Zefan 18864a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18870caa102dSLi Zefan return -EINVAL; 18880caa102dSLi Zefan 18890b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 18900caa102dSLi Zefan if (btrfs_root_readonly(root)) 18910caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 18920b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 18930caa102dSLi Zefan 18940caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 18950caa102dSLi Zefan ret = -EFAULT; 18960caa102dSLi Zefan 18970caa102dSLi Zefan return ret; 18980caa102dSLi Zefan } 18990caa102dSLi Zefan 19000caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19010caa102dSLi Zefan void __user *arg) 19020caa102dSLi Zefan { 1903496ad9aaSAl Viro struct inode *inode = file_inode(file); 19040b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19050caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19060caa102dSLi Zefan struct btrfs_trans_handle *trans; 19070caa102dSLi Zefan u64 root_flags; 19080caa102dSLi Zefan u64 flags; 19090caa102dSLi Zefan int ret = 0; 19100caa102dSLi Zefan 1911bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1912bd60ea0fSDavid Sterba return -EPERM; 1913bd60ea0fSDavid Sterba 1914b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1915b9ca0664SLiu Bo if (ret) 1916b9ca0664SLiu Bo goto out; 19170caa102dSLi Zefan 19184a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1919b9ca0664SLiu Bo ret = -EINVAL; 1920b9ca0664SLiu Bo goto out_drop_write; 1921b9ca0664SLiu Bo } 19220caa102dSLi Zefan 1923b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1924b9ca0664SLiu Bo ret = -EFAULT; 1925b9ca0664SLiu Bo goto out_drop_write; 1926b9ca0664SLiu Bo } 19270caa102dSLi Zefan 1928b9ca0664SLiu Bo if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { 1929b9ca0664SLiu Bo ret = -EINVAL; 1930b9ca0664SLiu Bo goto out_drop_write; 1931b9ca0664SLiu Bo } 19320caa102dSLi Zefan 1933b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1934b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1935b9ca0664SLiu Bo goto out_drop_write; 1936b9ca0664SLiu Bo } 19370caa102dSLi Zefan 19380b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19390caa102dSLi Zefan 19400caa102dSLi Zefan /* nothing to do */ 19410caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1942b9ca0664SLiu Bo goto out_drop_sem; 19430caa102dSLi Zefan 19440caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19452c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19460caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19470caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19482c686537SDavid Sterba } else { 19492c686537SDavid Sterba /* 19502c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19512c686537SDavid Sterba * send 19522c686537SDavid Sterba */ 19532c686537SDavid Sterba spin_lock(&root->root_item_lock); 19542c686537SDavid Sterba if (root->send_in_progress == 0) { 19550caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19560caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19572c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19582c686537SDavid Sterba } else { 19592c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19600b246afaSJeff Mahoney btrfs_warn(fs_info, 19612c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19622c686537SDavid Sterba root->root_key.objectid); 19632c686537SDavid Sterba ret = -EPERM; 19642c686537SDavid Sterba goto out_drop_sem; 19652c686537SDavid Sterba } 19662c686537SDavid Sterba } 19670caa102dSLi Zefan 19680caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19690caa102dSLi Zefan if (IS_ERR(trans)) { 19700caa102dSLi Zefan ret = PTR_ERR(trans); 19710caa102dSLi Zefan goto out_reset; 19720caa102dSLi Zefan } 19730caa102dSLi Zefan 19740b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19750caa102dSLi Zefan &root->root_key, &root->root_item); 19769417ebc8SNikolay Borisov if (ret < 0) { 19779417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19789417ebc8SNikolay Borisov goto out_reset; 19799417ebc8SNikolay Borisov } 19800caa102dSLi Zefan 19819417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19829417ebc8SNikolay Borisov 19830caa102dSLi Zefan out_reset: 19840caa102dSLi Zefan if (ret) 19850caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1986b9ca0664SLiu Bo out_drop_sem: 19870b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1988b9ca0664SLiu Bo out_drop_write: 1989b9ca0664SLiu Bo mnt_drop_write_file(file); 1990b9ca0664SLiu Bo out: 19910caa102dSLi Zefan return ret; 19920caa102dSLi Zefan } 19930caa102dSLi Zefan 1994ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1995ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1996ac8e9819SChris Mason { 1997abc6e134SChris Mason struct btrfs_key test; 1998abc6e134SChris Mason int ret; 1999abc6e134SChris Mason 2000abc6e134SChris Mason test.objectid = sk->min_objectid; 2001abc6e134SChris Mason test.type = sk->min_type; 2002abc6e134SChris Mason test.offset = sk->min_offset; 2003abc6e134SChris Mason 2004abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2005abc6e134SChris Mason if (ret < 0) 2006ac8e9819SChris Mason return 0; 2007abc6e134SChris Mason 2008abc6e134SChris Mason test.objectid = sk->max_objectid; 2009abc6e134SChris Mason test.type = sk->max_type; 2010abc6e134SChris Mason test.offset = sk->max_offset; 2011abc6e134SChris Mason 2012abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2013abc6e134SChris Mason if (ret > 0) 2014ac8e9819SChris Mason return 0; 2015ac8e9819SChris Mason return 1; 2016ac8e9819SChris Mason } 2017ac8e9819SChris Mason 2018df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2019ac8e9819SChris Mason struct btrfs_key *key, 2020ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20219b6e817dSGerhard Heift size_t *buf_size, 2022ba346b35SGerhard Heift char __user *ubuf, 2023ac8e9819SChris Mason unsigned long *sk_offset, 2024ac8e9819SChris Mason int *num_found) 2025ac8e9819SChris Mason { 2026ac8e9819SChris Mason u64 found_transid; 2027ac8e9819SChris Mason struct extent_buffer *leaf; 2028ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2029dd81d459SNaohiro Aota struct btrfs_key test; 2030ac8e9819SChris Mason unsigned long item_off; 2031ac8e9819SChris Mason unsigned long item_len; 2032ac8e9819SChris Mason int nritems; 2033ac8e9819SChris Mason int i; 2034ac8e9819SChris Mason int slot; 2035ac8e9819SChris Mason int ret = 0; 2036ac8e9819SChris Mason 2037ac8e9819SChris Mason leaf = path->nodes[0]; 2038ac8e9819SChris Mason slot = path->slots[0]; 2039ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2040ac8e9819SChris Mason 2041ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2042ac8e9819SChris Mason i = nritems; 2043ac8e9819SChris Mason goto advance_key; 2044ac8e9819SChris Mason } 2045ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2046ac8e9819SChris Mason 2047ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2048ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2049ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2050ac8e9819SChris Mason 205103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 205203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 205303b71c6cSGabriel de Perthuis continue; 205403b71c6cSGabriel de Perthuis 20559b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20568f5f6178SGerhard Heift if (*num_found) { 2057ac8e9819SChris Mason ret = 1; 20588f5f6178SGerhard Heift goto out; 20598f5f6178SGerhard Heift } 20608f5f6178SGerhard Heift 20618f5f6178SGerhard Heift /* 20628f5f6178SGerhard Heift * return one empty item back for v1, which does not 20638f5f6178SGerhard Heift * handle -EOVERFLOW 20648f5f6178SGerhard Heift */ 20658f5f6178SGerhard Heift 20669b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2067ac8e9819SChris Mason item_len = 0; 20688f5f6178SGerhard Heift ret = -EOVERFLOW; 20698f5f6178SGerhard Heift } 2070ac8e9819SChris Mason 20719b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2072ac8e9819SChris Mason ret = 1; 207325c9bc2eSGerhard Heift goto out; 2074ac8e9819SChris Mason } 2075ac8e9819SChris Mason 2076ac8e9819SChris Mason sh.objectid = key->objectid; 2077ac8e9819SChris Mason sh.offset = key->offset; 2078ac8e9819SChris Mason sh.type = key->type; 2079ac8e9819SChris Mason sh.len = item_len; 2080ac8e9819SChris Mason sh.transid = found_transid; 2081ac8e9819SChris Mason 2082ac8e9819SChris Mason /* copy search result header */ 2083ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2084ba346b35SGerhard Heift ret = -EFAULT; 2085ba346b35SGerhard Heift goto out; 2086ba346b35SGerhard Heift } 2087ba346b35SGerhard Heift 2088ac8e9819SChris Mason *sk_offset += sizeof(sh); 2089ac8e9819SChris Mason 2090ac8e9819SChris Mason if (item_len) { 2091ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2092ac8e9819SChris Mason /* copy the item */ 2093ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2094ba346b35SGerhard Heift item_off, item_len)) { 2095ba346b35SGerhard Heift ret = -EFAULT; 2096ba346b35SGerhard Heift goto out; 2097ba346b35SGerhard Heift } 2098ba346b35SGerhard Heift 2099ac8e9819SChris Mason *sk_offset += item_len; 2100ac8e9819SChris Mason } 2101e2156867SHugo Mills (*num_found)++; 2102ac8e9819SChris Mason 21038f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21048f5f6178SGerhard Heift goto out; 21058f5f6178SGerhard Heift 210625c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 210725c9bc2eSGerhard Heift ret = 1; 210825c9bc2eSGerhard Heift goto out; 210925c9bc2eSGerhard Heift } 2110ac8e9819SChris Mason } 2111ac8e9819SChris Mason advance_key: 2112ac8e9819SChris Mason ret = 0; 2113dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2114dd81d459SNaohiro Aota test.type = sk->max_type; 2115dd81d459SNaohiro Aota test.offset = sk->max_offset; 2116dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2117dd81d459SNaohiro Aota ret = 1; 2118dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2119abc6e134SChris Mason key->offset++; 2120dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2121abc6e134SChris Mason key->offset = 0; 2122abc6e134SChris Mason key->type++; 2123dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2124abc6e134SChris Mason key->offset = 0; 2125abc6e134SChris Mason key->type = 0; 2126abc6e134SChris Mason key->objectid++; 2127abc6e134SChris Mason } else 2128abc6e134SChris Mason ret = 1; 212925c9bc2eSGerhard Heift out: 2130ba346b35SGerhard Heift /* 2131ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2132ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2133ba346b35SGerhard Heift * * all items were found 2134ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2135ba346b35SGerhard Heift * leaf 2136ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2137ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2138ba346b35SGerhard Heift */ 2139ac8e9819SChris Mason return ret; 2140ac8e9819SChris Mason } 2141ac8e9819SChris Mason 2142ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 214312544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21449b6e817dSGerhard Heift size_t *buf_size, 2145ba346b35SGerhard Heift char __user *ubuf) 2146ac8e9819SChris Mason { 21470b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2148ac8e9819SChris Mason struct btrfs_root *root; 2149ac8e9819SChris Mason struct btrfs_key key; 2150ac8e9819SChris Mason struct btrfs_path *path; 2151ac8e9819SChris Mason int ret; 2152ac8e9819SChris Mason int num_found = 0; 2153ac8e9819SChris Mason unsigned long sk_offset = 0; 2154ac8e9819SChris Mason 21559b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21569b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 215712544442SGerhard Heift return -EOVERFLOW; 21589b6e817dSGerhard Heift } 215912544442SGerhard Heift 2160ac8e9819SChris Mason path = btrfs_alloc_path(); 2161ac8e9819SChris Mason if (!path) 2162ac8e9819SChris Mason return -ENOMEM; 2163ac8e9819SChris Mason 2164ac8e9819SChris Mason if (sk->tree_id == 0) { 2165ac8e9819SChris Mason /* search the root of the inode that was passed */ 2166ac8e9819SChris Mason root = BTRFS_I(inode)->root; 2167ac8e9819SChris Mason } else { 2168ac8e9819SChris Mason key.objectid = sk->tree_id; 2169ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2170ac8e9819SChris Mason key.offset = (u64)-1; 2171ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 2172ac8e9819SChris Mason if (IS_ERR(root)) { 2173ac8e9819SChris Mason btrfs_free_path(path); 2174ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2175ac8e9819SChris Mason } 2176ac8e9819SChris Mason } 2177ac8e9819SChris Mason 2178ac8e9819SChris Mason key.objectid = sk->min_objectid; 2179ac8e9819SChris Mason key.type = sk->min_type; 2180ac8e9819SChris Mason key.offset = sk->min_offset; 2181ac8e9819SChris Mason 2182ac8e9819SChris Mason while (1) { 21836174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2184ac8e9819SChris Mason if (ret != 0) { 2185ac8e9819SChris Mason if (ret > 0) 2186ac8e9819SChris Mason ret = 0; 2187ac8e9819SChris Mason goto err; 2188ac8e9819SChris Mason } 2189df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2190ac8e9819SChris Mason &sk_offset, &num_found); 2191b3b4aa74SDavid Sterba btrfs_release_path(path); 219225c9bc2eSGerhard Heift if (ret) 2193ac8e9819SChris Mason break; 2194ac8e9819SChris Mason 2195ac8e9819SChris Mason } 21968f5f6178SGerhard Heift if (ret > 0) 2197ac8e9819SChris Mason ret = 0; 2198ac8e9819SChris Mason err: 2199ac8e9819SChris Mason sk->nr_items = num_found; 2200ac8e9819SChris Mason btrfs_free_path(path); 2201ac8e9819SChris Mason return ret; 2202ac8e9819SChris Mason } 2203ac8e9819SChris Mason 2204ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2205ac8e9819SChris Mason void __user *argp) 2206ac8e9819SChris Mason { 2207ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2208ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2209ac8e9819SChris Mason struct inode *inode; 2210ac8e9819SChris Mason int ret; 22119b6e817dSGerhard Heift size_t buf_size; 2212ac8e9819SChris Mason 2213ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2214ac8e9819SChris Mason return -EPERM; 2215ac8e9819SChris Mason 2216ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2217ac8e9819SChris Mason 2218ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2219ba346b35SGerhard Heift return -EFAULT; 2220ba346b35SGerhard Heift 2221ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2222ac8e9819SChris Mason 2223496ad9aaSAl Viro inode = file_inode(file); 2224ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22258f5f6178SGerhard Heift 22268f5f6178SGerhard Heift /* 22278f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22288f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22298f5f6178SGerhard Heift */ 22308f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22318f5f6178SGerhard Heift ret = 0; 22328f5f6178SGerhard Heift 2233ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2234ac8e9819SChris Mason ret = -EFAULT; 2235ac8e9819SChris Mason return ret; 2236ac8e9819SChris Mason } 2237ac8e9819SChris Mason 2238cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2239cc68a8a5SGerhard Heift void __user *argp) 2240cc68a8a5SGerhard Heift { 2241cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2242cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2243cc68a8a5SGerhard Heift struct inode *inode; 2244cc68a8a5SGerhard Heift int ret; 2245cc68a8a5SGerhard Heift size_t buf_size; 2246ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2247cc68a8a5SGerhard Heift 2248cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2249cc68a8a5SGerhard Heift return -EPERM; 2250cc68a8a5SGerhard Heift 2251cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2252cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2253cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2254cc68a8a5SGerhard Heift return -EFAULT; 2255cc68a8a5SGerhard Heift 2256cc68a8a5SGerhard Heift buf_size = args.buf_size; 2257cc68a8a5SGerhard Heift 2258cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2259cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2260cc68a8a5SGerhard Heift buf_size = buf_limit; 2261cc68a8a5SGerhard Heift 2262cc68a8a5SGerhard Heift inode = file_inode(file); 2263cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2264718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2265cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2266cc68a8a5SGerhard Heift ret = -EFAULT; 2267cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2268cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2269cc68a8a5SGerhard Heift ret = -EFAULT; 2270cc68a8a5SGerhard Heift 227176dda93cSYan, Zheng return ret; 227276dda93cSYan, Zheng } 227376dda93cSYan, Zheng 227498d377a0STARUISI Hiroaki /* 2275ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2276ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 227798d377a0STARUISI Hiroaki */ 227898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 227998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 228098d377a0STARUISI Hiroaki { 228198d377a0STARUISI Hiroaki struct btrfs_root *root; 228298d377a0STARUISI Hiroaki struct btrfs_key key; 2283ac8e9819SChris Mason char *ptr; 228498d377a0STARUISI Hiroaki int ret = -1; 228598d377a0STARUISI Hiroaki int slot; 228698d377a0STARUISI Hiroaki int len; 228798d377a0STARUISI Hiroaki int total_len = 0; 228898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 228998d377a0STARUISI Hiroaki struct extent_buffer *l; 229098d377a0STARUISI Hiroaki struct btrfs_path *path; 229198d377a0STARUISI Hiroaki 229298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 229398d377a0STARUISI Hiroaki name[0]='\0'; 229498d377a0STARUISI Hiroaki return 0; 229598d377a0STARUISI Hiroaki } 229698d377a0STARUISI Hiroaki 229798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 229898d377a0STARUISI Hiroaki if (!path) 229998d377a0STARUISI Hiroaki return -ENOMEM; 230098d377a0STARUISI Hiroaki 2301c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 230298d377a0STARUISI Hiroaki 230398d377a0STARUISI Hiroaki key.objectid = tree_id; 230498d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 230598d377a0STARUISI Hiroaki key.offset = (u64)-1; 230698d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 230798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2308ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 23098ad6fcabSChris Mason goto out; 231098d377a0STARUISI Hiroaki } 231198d377a0STARUISI Hiroaki 231298d377a0STARUISI Hiroaki key.objectid = dirid; 231398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23148ad6fcabSChris Mason key.offset = (u64)-1; 231598d377a0STARUISI Hiroaki 231698d377a0STARUISI Hiroaki while (1) { 231798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 231898d377a0STARUISI Hiroaki if (ret < 0) 231998d377a0STARUISI Hiroaki goto out; 232018674c6cSFilipe David Borba Manana else if (ret > 0) { 232118674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 232218674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 232318674c6cSFilipe David Borba Manana if (ret < 0) 232418674c6cSFilipe David Borba Manana goto out; 232518674c6cSFilipe David Borba Manana else if (ret > 0) { 2326ac8e9819SChris Mason ret = -ENOENT; 232798d377a0STARUISI Hiroaki goto out; 2328ac8e9819SChris Mason } 232918674c6cSFilipe David Borba Manana } 233018674c6cSFilipe David Borba Manana 233118674c6cSFilipe David Borba Manana l = path->nodes[0]; 233218674c6cSFilipe David Borba Manana slot = path->slots[0]; 233318674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 233498d377a0STARUISI Hiroaki 233598d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 233698d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 233798d377a0STARUISI Hiroaki ptr -= len + 1; 233898d377a0STARUISI Hiroaki total_len += len + 1; 2339a696cf35SFilipe David Borba Manana if (ptr < name) { 2340a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 234198d377a0STARUISI Hiroaki goto out; 2342a696cf35SFilipe David Borba Manana } 234398d377a0STARUISI Hiroaki 234498d377a0STARUISI Hiroaki *(ptr + len) = '/'; 234598d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 234698d377a0STARUISI Hiroaki 234798d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 234898d377a0STARUISI Hiroaki break; 234998d377a0STARUISI Hiroaki 2350b3b4aa74SDavid Sterba btrfs_release_path(path); 235198d377a0STARUISI Hiroaki key.objectid = key.offset; 23528ad6fcabSChris Mason key.offset = (u64)-1; 235398d377a0STARUISI Hiroaki dirid = key.objectid; 235498d377a0STARUISI Hiroaki } 235577906a50SLi Zefan memmove(name, ptr, total_len); 235698d377a0STARUISI Hiroaki name[total_len] = '\0'; 235798d377a0STARUISI Hiroaki ret = 0; 235898d377a0STARUISI Hiroaki out: 235998d377a0STARUISI Hiroaki btrfs_free_path(path); 2360ac8e9819SChris Mason return ret; 2361ac8e9819SChris Mason } 2362ac8e9819SChris Mason 236323d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 236423d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 236523d0b79dSTomohiro Misono { 236623d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 236723d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 236823d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 236923d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 237023d0b79dSTomohiro Misono u64 dirid = args->dirid; 237123d0b79dSTomohiro Misono unsigned long item_off; 237223d0b79dSTomohiro Misono unsigned long item_len; 237323d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 237423d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 237523d0b79dSTomohiro Misono struct btrfs_root *root; 237623d0b79dSTomohiro Misono struct btrfs_path *path; 237723d0b79dSTomohiro Misono struct btrfs_key key, key2; 237823d0b79dSTomohiro Misono struct extent_buffer *leaf; 237923d0b79dSTomohiro Misono struct inode *temp_inode; 238023d0b79dSTomohiro Misono char *ptr; 238123d0b79dSTomohiro Misono int slot; 238223d0b79dSTomohiro Misono int len; 238323d0b79dSTomohiro Misono int total_len = 0; 238423d0b79dSTomohiro Misono int ret; 238523d0b79dSTomohiro Misono 238623d0b79dSTomohiro Misono path = btrfs_alloc_path(); 238723d0b79dSTomohiro Misono if (!path) 238823d0b79dSTomohiro Misono return -ENOMEM; 238923d0b79dSTomohiro Misono 239023d0b79dSTomohiro Misono /* 239123d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 239223d0b79dSTomohiro Misono * construct the path in from the bottom up. 239323d0b79dSTomohiro Misono */ 239423d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 239523d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 239623d0b79dSTomohiro Misono 239723d0b79dSTomohiro Misono key.objectid = treeid; 239823d0b79dSTomohiro Misono key.type = BTRFS_ROOT_ITEM_KEY; 239923d0b79dSTomohiro Misono key.offset = (u64)-1; 240023d0b79dSTomohiro Misono root = btrfs_read_fs_root_no_name(fs_info, &key); 240123d0b79dSTomohiro Misono if (IS_ERR(root)) { 240223d0b79dSTomohiro Misono ret = PTR_ERR(root); 240323d0b79dSTomohiro Misono goto out; 240423d0b79dSTomohiro Misono } 240523d0b79dSTomohiro Misono 240623d0b79dSTomohiro Misono key.objectid = dirid; 240723d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 240823d0b79dSTomohiro Misono key.offset = (u64)-1; 240923d0b79dSTomohiro Misono while (1) { 241023d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 241123d0b79dSTomohiro Misono if (ret < 0) { 241223d0b79dSTomohiro Misono goto out; 241323d0b79dSTomohiro Misono } else if (ret > 0) { 241423d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 241523d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 241623d0b79dSTomohiro Misono if (ret < 0) { 241723d0b79dSTomohiro Misono goto out; 241823d0b79dSTomohiro Misono } else if (ret > 0) { 241923d0b79dSTomohiro Misono ret = -ENOENT; 242023d0b79dSTomohiro Misono goto out; 242123d0b79dSTomohiro Misono } 242223d0b79dSTomohiro Misono } 242323d0b79dSTomohiro Misono 242423d0b79dSTomohiro Misono leaf = path->nodes[0]; 242523d0b79dSTomohiro Misono slot = path->slots[0]; 242623d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 242723d0b79dSTomohiro Misono 242823d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 242923d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 243023d0b79dSTomohiro Misono ptr -= len + 1; 243123d0b79dSTomohiro Misono total_len += len + 1; 243223d0b79dSTomohiro Misono if (ptr < args->path) { 243323d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 243423d0b79dSTomohiro Misono goto out; 243523d0b79dSTomohiro Misono } 243623d0b79dSTomohiro Misono 243723d0b79dSTomohiro Misono *(ptr + len) = '/'; 243823d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 243923d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 244023d0b79dSTomohiro Misono 244123d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 244223d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 244323d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 244423d0b79dSTomohiro Misono if (ret < 0) { 244523d0b79dSTomohiro Misono goto out; 244623d0b79dSTomohiro Misono } else if (ret > 0) { 244723d0b79dSTomohiro Misono ret = -ENOENT; 244823d0b79dSTomohiro Misono goto out; 244923d0b79dSTomohiro Misono } 245023d0b79dSTomohiro Misono 245123d0b79dSTomohiro Misono leaf = path->nodes[0]; 245223d0b79dSTomohiro Misono slot = path->slots[0]; 245323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 245423d0b79dSTomohiro Misono if (key2.objectid != dirid) { 245523d0b79dSTomohiro Misono ret = -ENOENT; 245623d0b79dSTomohiro Misono goto out; 245723d0b79dSTomohiro Misono } 245823d0b79dSTomohiro Misono 245923d0b79dSTomohiro Misono temp_inode = btrfs_iget(sb, &key2, root, NULL); 24603ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24613ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 24623ca57bd6SMisono Tomohiro goto out; 24633ca57bd6SMisono Tomohiro } 246423d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 246523d0b79dSTomohiro Misono iput(temp_inode); 246623d0b79dSTomohiro Misono if (ret) { 246723d0b79dSTomohiro Misono ret = -EACCES; 246823d0b79dSTomohiro Misono goto out; 246923d0b79dSTomohiro Misono } 247023d0b79dSTomohiro Misono 247123d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 247223d0b79dSTomohiro Misono break; 247323d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 247423d0b79dSTomohiro Misono ret = -EACCES; 247523d0b79dSTomohiro Misono goto out; 247623d0b79dSTomohiro Misono } 247723d0b79dSTomohiro Misono 247823d0b79dSTomohiro Misono btrfs_release_path(path); 247923d0b79dSTomohiro Misono key.objectid = key.offset; 248023d0b79dSTomohiro Misono key.offset = (u64)-1; 248123d0b79dSTomohiro Misono dirid = key.objectid; 248223d0b79dSTomohiro Misono } 248323d0b79dSTomohiro Misono 248423d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 248523d0b79dSTomohiro Misono args->path[total_len] = '\0'; 248623d0b79dSTomohiro Misono btrfs_release_path(path); 248723d0b79dSTomohiro Misono } 248823d0b79dSTomohiro Misono 248923d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 249023d0b79dSTomohiro Misono root = fs_info->tree_root; 249123d0b79dSTomohiro Misono key.objectid = treeid; 249223d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 249323d0b79dSTomohiro Misono key.offset = args->treeid; 249423d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 249523d0b79dSTomohiro Misono if (ret < 0) { 249623d0b79dSTomohiro Misono goto out; 249723d0b79dSTomohiro Misono } else if (ret > 0) { 249823d0b79dSTomohiro Misono ret = -ENOENT; 249923d0b79dSTomohiro Misono goto out; 250023d0b79dSTomohiro Misono } 250123d0b79dSTomohiro Misono 250223d0b79dSTomohiro Misono leaf = path->nodes[0]; 250323d0b79dSTomohiro Misono slot = path->slots[0]; 250423d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 250523d0b79dSTomohiro Misono 250623d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 250723d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 250823d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 250923d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 251023d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 251123d0b79dSTomohiro Misono ret = -EINVAL; 251223d0b79dSTomohiro Misono goto out; 251323d0b79dSTomohiro Misono } 251423d0b79dSTomohiro Misono 251523d0b79dSTomohiro Misono /* Copy subvolume's name */ 251623d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 251723d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 251823d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 251923d0b79dSTomohiro Misono args->name[item_len] = 0; 252023d0b79dSTomohiro Misono 252123d0b79dSTomohiro Misono out: 252223d0b79dSTomohiro Misono btrfs_free_path(path); 252323d0b79dSTomohiro Misono return ret; 252423d0b79dSTomohiro Misono } 252523d0b79dSTomohiro Misono 2526ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2527ac8e9819SChris Mason void __user *argp) 2528ac8e9819SChris Mason { 2529ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2530ac8e9819SChris Mason struct inode *inode; 253101b810b8SDavid Sterba int ret = 0; 2532ac8e9819SChris Mason 25332354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25342354d08fSJulia Lawall if (IS_ERR(args)) 25352354d08fSJulia Lawall return PTR_ERR(args); 2536c2b96929SDan Carpenter 2537496ad9aaSAl Viro inode = file_inode(file); 2538ac8e9819SChris Mason 253901b810b8SDavid Sterba /* 254001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 254101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 254201b810b8SDavid Sterba */ 25431b53ac4dSChris Mason if (args->treeid == 0) 25441b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25451b53ac4dSChris Mason 254601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 254701b810b8SDavid Sterba args->name[0] = 0; 254801b810b8SDavid Sterba goto out; 254901b810b8SDavid Sterba } 255001b810b8SDavid Sterba 255101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 255201b810b8SDavid Sterba ret = -EPERM; 255301b810b8SDavid Sterba goto out; 255401b810b8SDavid Sterba } 255501b810b8SDavid Sterba 2556ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2557ac8e9819SChris Mason args->treeid, args->objectid, 2558ac8e9819SChris Mason args->name); 2559ac8e9819SChris Mason 256001b810b8SDavid Sterba out: 2561ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2562ac8e9819SChris Mason ret = -EFAULT; 2563ac8e9819SChris Mason 2564ac8e9819SChris Mason kfree(args); 256598d377a0STARUISI Hiroaki return ret; 256698d377a0STARUISI Hiroaki } 256798d377a0STARUISI Hiroaki 256823d0b79dSTomohiro Misono /* 256923d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 257023d0b79dSTomohiro Misono * 257123d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 257223d0b79dSTomohiro Misono * 257323d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 257423d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 257523d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 257623d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 257723d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 257823d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 257923d0b79dSTomohiro Misono */ 258023d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 258123d0b79dSTomohiro Misono { 258223d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 258323d0b79dSTomohiro Misono struct inode *inode; 258423d0b79dSTomohiro Misono int ret; 258523d0b79dSTomohiro Misono 258623d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 258723d0b79dSTomohiro Misono if (IS_ERR(args)) 258823d0b79dSTomohiro Misono return PTR_ERR(args); 258923d0b79dSTomohiro Misono 259023d0b79dSTomohiro Misono inode = file_inode(file); 259123d0b79dSTomohiro Misono 259223d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 259323d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 259423d0b79dSTomohiro Misono /* 259523d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 259623d0b79dSTomohiro Misono * called 259723d0b79dSTomohiro Misono */ 259823d0b79dSTomohiro Misono kfree(args); 259923d0b79dSTomohiro Misono return -EACCES; 260023d0b79dSTomohiro Misono } 260123d0b79dSTomohiro Misono 260223d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 260323d0b79dSTomohiro Misono 260423d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 260523d0b79dSTomohiro Misono ret = -EFAULT; 260623d0b79dSTomohiro Misono 260723d0b79dSTomohiro Misono kfree(args); 260823d0b79dSTomohiro Misono return ret; 260923d0b79dSTomohiro Misono } 261023d0b79dSTomohiro Misono 2611b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2612b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2613b64ec075STomohiro Misono { 2614b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2615b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2616b64ec075STomohiro Misono struct btrfs_root *root; 2617b64ec075STomohiro Misono struct btrfs_path *path; 2618b64ec075STomohiro Misono struct btrfs_key key; 2619b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2620b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2621b64ec075STomohiro Misono struct extent_buffer *leaf; 2622b64ec075STomohiro Misono unsigned long item_off; 2623b64ec075STomohiro Misono unsigned long item_len; 2624b64ec075STomohiro Misono struct inode *inode; 2625b64ec075STomohiro Misono int slot; 2626b64ec075STomohiro Misono int ret = 0; 2627b64ec075STomohiro Misono 2628b64ec075STomohiro Misono path = btrfs_alloc_path(); 2629b64ec075STomohiro Misono if (!path) 2630b64ec075STomohiro Misono return -ENOMEM; 2631b64ec075STomohiro Misono 2632b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2633b64ec075STomohiro Misono if (!subvol_info) { 2634b64ec075STomohiro Misono btrfs_free_path(path); 2635b64ec075STomohiro Misono return -ENOMEM; 2636b64ec075STomohiro Misono } 2637b64ec075STomohiro Misono 2638b64ec075STomohiro Misono inode = file_inode(file); 2639b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2640b64ec075STomohiro Misono 2641b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2642b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 2643b64ec075STomohiro Misono key.type = BTRFS_ROOT_ITEM_KEY; 2644b64ec075STomohiro Misono key.offset = (u64)-1; 2645b64ec075STomohiro Misono root = btrfs_read_fs_root_no_name(fs_info, &key); 2646b64ec075STomohiro Misono if (IS_ERR(root)) { 2647b64ec075STomohiro Misono ret = PTR_ERR(root); 2648b64ec075STomohiro Misono goto out; 2649b64ec075STomohiro Misono } 2650b64ec075STomohiro Misono root_item = &root->root_item; 2651b64ec075STomohiro Misono 2652b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2653b64ec075STomohiro Misono 2654b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2655b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2656b64ec075STomohiro Misono 2657b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2658b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2659b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2660b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2661b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2662b64ec075STomohiro Misono 2663b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2664b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2665b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2666b64ec075STomohiro Misono 2667b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2668b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2669b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2670b64ec075STomohiro Misono 2671b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2672b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2673b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2674b64ec075STomohiro Misono 2675b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2676b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2677b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2678b64ec075STomohiro Misono 2679b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2680b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2681b64ec075STomohiro Misono root = fs_info->tree_root; 2682b64ec075STomohiro Misono 2683b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2684b64ec075STomohiro Misono key.offset = 0; 2685b64ec075STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 2686b64ec075STomohiro Misono if (ret < 0) { 2687b64ec075STomohiro Misono goto out; 2688b64ec075STomohiro Misono } else if (path->slots[0] >= 2689b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 2690b64ec075STomohiro Misono ret = btrfs_next_leaf(root, path); 2691b64ec075STomohiro Misono if (ret < 0) { 2692b64ec075STomohiro Misono goto out; 2693b64ec075STomohiro Misono } else if (ret > 0) { 2694b64ec075STomohiro Misono ret = -EUCLEAN; 2695b64ec075STomohiro Misono goto out; 2696b64ec075STomohiro Misono } 2697b64ec075STomohiro Misono } 2698b64ec075STomohiro Misono 2699b64ec075STomohiro Misono leaf = path->nodes[0]; 2700b64ec075STomohiro Misono slot = path->slots[0]; 2701b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2702b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2703b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2704b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2705b64ec075STomohiro Misono 2706b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2707b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2708b64ec075STomohiro Misono 2709b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2710b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2711b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2712b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2713b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2714b64ec075STomohiro Misono item_off, item_len); 2715b64ec075STomohiro Misono } else { 2716b64ec075STomohiro Misono ret = -ENOENT; 2717b64ec075STomohiro Misono goto out; 2718b64ec075STomohiro Misono } 2719b64ec075STomohiro Misono } 2720b64ec075STomohiro Misono 2721b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2722b64ec075STomohiro Misono ret = -EFAULT; 2723b64ec075STomohiro Misono 2724b64ec075STomohiro Misono out: 2725b64ec075STomohiro Misono btrfs_free_path(path); 2726b64ec075STomohiro Misono kzfree(subvol_info); 2727b64ec075STomohiro Misono return ret; 2728b64ec075STomohiro Misono } 2729b64ec075STomohiro Misono 273042e4b520STomohiro Misono /* 273142e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 273242e4b520STomohiro Misono * except the subvolume name. 273342e4b520STomohiro Misono */ 273442e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 273542e4b520STomohiro Misono { 273642e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 273742e4b520STomohiro Misono struct btrfs_root_ref *rref; 273842e4b520STomohiro Misono struct btrfs_root *root; 273942e4b520STomohiro Misono struct btrfs_path *path; 274042e4b520STomohiro Misono struct btrfs_key key; 274142e4b520STomohiro Misono struct extent_buffer *leaf; 274242e4b520STomohiro Misono struct inode *inode; 274342e4b520STomohiro Misono u64 objectid; 274442e4b520STomohiro Misono int slot; 274542e4b520STomohiro Misono int ret; 274642e4b520STomohiro Misono u8 found; 274742e4b520STomohiro Misono 274842e4b520STomohiro Misono path = btrfs_alloc_path(); 274942e4b520STomohiro Misono if (!path) 275042e4b520STomohiro Misono return -ENOMEM; 275142e4b520STomohiro Misono 275242e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 275342e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 275442e4b520STomohiro Misono btrfs_free_path(path); 275542e4b520STomohiro Misono return PTR_ERR(rootrefs); 275642e4b520STomohiro Misono } 275742e4b520STomohiro Misono 275842e4b520STomohiro Misono inode = file_inode(file); 275942e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 276042e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 276142e4b520STomohiro Misono 276242e4b520STomohiro Misono key.objectid = objectid; 276342e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 276442e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 276542e4b520STomohiro Misono found = 0; 276642e4b520STomohiro Misono 276742e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 276842e4b520STomohiro Misono if (ret < 0) { 276942e4b520STomohiro Misono goto out; 277042e4b520STomohiro Misono } else if (path->slots[0] >= 277142e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 277242e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 277342e4b520STomohiro Misono if (ret < 0) { 277442e4b520STomohiro Misono goto out; 277542e4b520STomohiro Misono } else if (ret > 0) { 277642e4b520STomohiro Misono ret = -EUCLEAN; 277742e4b520STomohiro Misono goto out; 277842e4b520STomohiro Misono } 277942e4b520STomohiro Misono } 278042e4b520STomohiro Misono while (1) { 278142e4b520STomohiro Misono leaf = path->nodes[0]; 278242e4b520STomohiro Misono slot = path->slots[0]; 278342e4b520STomohiro Misono 278442e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 278542e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 278642e4b520STomohiro Misono ret = 0; 278742e4b520STomohiro Misono goto out; 278842e4b520STomohiro Misono } 278942e4b520STomohiro Misono 279042e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 279142e4b520STomohiro Misono ret = -EOVERFLOW; 279242e4b520STomohiro Misono goto out; 279342e4b520STomohiro Misono } 279442e4b520STomohiro Misono 279542e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 279642e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 279742e4b520STomohiro Misono rootrefs->rootref[found].dirid = 279842e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 279942e4b520STomohiro Misono found++; 280042e4b520STomohiro Misono 280142e4b520STomohiro Misono ret = btrfs_next_item(root, path); 280242e4b520STomohiro Misono if (ret < 0) { 280342e4b520STomohiro Misono goto out; 280442e4b520STomohiro Misono } else if (ret > 0) { 280542e4b520STomohiro Misono ret = -EUCLEAN; 280642e4b520STomohiro Misono goto out; 280742e4b520STomohiro Misono } 280842e4b520STomohiro Misono } 280942e4b520STomohiro Misono 281042e4b520STomohiro Misono out: 281142e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 281242e4b520STomohiro Misono rootrefs->num_items = found; 281342e4b520STomohiro Misono /* update min_treeid for next search */ 281442e4b520STomohiro Misono if (found) 281542e4b520STomohiro Misono rootrefs->min_treeid = 281642e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 281742e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 281842e4b520STomohiro Misono ret = -EFAULT; 281942e4b520STomohiro Misono } 282042e4b520STomohiro Misono 282142e4b520STomohiro Misono kfree(rootrefs); 282242e4b520STomohiro Misono btrfs_free_path(path); 282342e4b520STomohiro Misono 282442e4b520STomohiro Misono return ret; 282542e4b520STomohiro Misono } 282642e4b520STomohiro Misono 282776dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 282876dda93cSYan, Zheng void __user *arg) 282976dda93cSYan, Zheng { 283054563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28310b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 283276dda93cSYan, Zheng struct dentry *dentry; 28332b0143b5SDavid Howells struct inode *dir = d_inode(parent); 283476dda93cSYan, Zheng struct inode *inode; 283576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 283676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 283776dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 283876dda93cSYan, Zheng int namelen; 283976dda93cSYan, Zheng int err = 0; 284076dda93cSYan, Zheng 2841325c50e3SJeff Mahoney if (!S_ISDIR(dir->i_mode)) 2842325c50e3SJeff Mahoney return -ENOTDIR; 2843325c50e3SJeff Mahoney 284476dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 284576dda93cSYan, Zheng if (IS_ERR(vol_args)) 284676dda93cSYan, Zheng return PTR_ERR(vol_args); 284776dda93cSYan, Zheng 284876dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 284976dda93cSYan, Zheng namelen = strlen(vol_args->name); 285076dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 285176dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 285276dda93cSYan, Zheng err = -EINVAL; 285376dda93cSYan, Zheng goto out; 285476dda93cSYan, Zheng } 285576dda93cSYan, Zheng 2856a561be71SAl Viro err = mnt_want_write_file(file); 285776dda93cSYan, Zheng if (err) 285876dda93cSYan, Zheng goto out; 285976dda93cSYan, Zheng 2860521e0546SDavid Sterba 286100235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 286200235411SAl Viro if (err == -EINTR) 286300235411SAl Viro goto out_drop_write; 286476dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 286576dda93cSYan, Zheng if (IS_ERR(dentry)) { 286676dda93cSYan, Zheng err = PTR_ERR(dentry); 286776dda93cSYan, Zheng goto out_unlock_dir; 286876dda93cSYan, Zheng } 286976dda93cSYan, Zheng 28702b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 287176dda93cSYan, Zheng err = -ENOENT; 287276dda93cSYan, Zheng goto out_dput; 287376dda93cSYan, Zheng } 287476dda93cSYan, Zheng 28752b0143b5SDavid Howells inode = d_inode(dentry); 28764260f7c7SSage Weil dest = BTRFS_I(inode)->root; 28774260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 28784260f7c7SSage Weil /* 28794260f7c7SSage Weil * Regular user. Only allow this with a special mount 28804260f7c7SSage Weil * option, when the user has write+exec access to the 28814260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 28824260f7c7SSage Weil * allowed. 28834260f7c7SSage Weil * 28844260f7c7SSage Weil * Note that this is _not_ check that the subvol is 28854260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 28864260f7c7SSage Weil * otherwise be able to delete. 28874260f7c7SSage Weil * 28884260f7c7SSage Weil * Users who want to delete empty subvols should try 28894260f7c7SSage Weil * rmdir(2). 28904260f7c7SSage Weil */ 28914260f7c7SSage Weil err = -EPERM; 28920b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 28934260f7c7SSage Weil goto out_dput; 28944260f7c7SSage Weil 28954260f7c7SSage Weil /* 28964260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 28974260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 28984260f7c7SSage Weil * must be called on the dentry referencing the root 28994260f7c7SSage Weil * of the subvol, not a random directory contained 29004260f7c7SSage Weil * within it. 29014260f7c7SSage Weil */ 29024260f7c7SSage Weil err = -EINVAL; 29034260f7c7SSage Weil if (root == dest) 29044260f7c7SSage Weil goto out_dput; 29054260f7c7SSage Weil 29064260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 29074260f7c7SSage Weil if (err) 29084260f7c7SSage Weil goto out_dput; 29095c39da5bSMiao Xie } 29104260f7c7SSage Weil 29115c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 29124260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 29134260f7c7SSage Weil if (err) 29144260f7c7SSage Weil goto out_dput; 29154260f7c7SSage Weil 29164a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 291776dda93cSYan, Zheng err = -EINVAL; 291876dda93cSYan, Zheng goto out_dput; 291976dda93cSYan, Zheng } 292076dda93cSYan, Zheng 29215955102cSAl Viro inode_lock(inode); 2922f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 29235955102cSAl Viro inode_unlock(inode); 2924f60a2364SMisono Tomohiro if (!err) 292576dda93cSYan, Zheng d_delete(dentry); 2926fa6ac876SLiu Bo 292776dda93cSYan, Zheng out_dput: 292876dda93cSYan, Zheng dput(dentry); 292976dda93cSYan, Zheng out_unlock_dir: 29305955102cSAl Viro inode_unlock(dir); 293100235411SAl Viro out_drop_write: 29322a79f17eSAl Viro mnt_drop_write_file(file); 293376dda93cSYan, Zheng out: 293476dda93cSYan, Zheng kfree(vol_args); 293576dda93cSYan, Zheng return err; 293676dda93cSYan, Zheng } 293776dda93cSYan, Zheng 29381e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2939f46b5a66SChristoph Hellwig { 2940496ad9aaSAl Viro struct inode *inode = file_inode(file); 2941f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 29421e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 2943c146afadSYan Zheng int ret; 2944c146afadSYan Zheng 294525122d15SIlya Dryomov ret = mnt_want_write_file(file); 294625122d15SIlya Dryomov if (ret) 294725122d15SIlya Dryomov return ret; 2948b83cc969SLi Zefan 294925122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 295025122d15SIlya Dryomov ret = -EROFS; 295125122d15SIlya Dryomov goto out; 29525ac00addSStefan Behrens } 2953f46b5a66SChristoph Hellwig 2954f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2955f46b5a66SChristoph Hellwig case S_IFDIR: 2956e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2957e441d54dSChris Mason ret = -EPERM; 2958e441d54dSChris Mason goto out; 2959e441d54dSChris Mason } 2960de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 2961f46b5a66SChristoph Hellwig break; 2962f46b5a66SChristoph Hellwig case S_IFREG: 2963616d374eSAdam Borowski /* 2964616d374eSAdam Borowski * Note that this does not check the file descriptor for write 2965616d374eSAdam Borowski * access. This prevents defragmenting executables that are 2966616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 2967616d374eSAdam Borowski */ 2968616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 2969616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 2970616d374eSAdam Borowski ret = -EPERM; 2971e441d54dSChris Mason goto out; 2972e441d54dSChris Mason } 29731e701a32SChris Mason 29741e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 29751e701a32SChris Mason if (!range) { 29761e701a32SChris Mason ret = -ENOMEM; 29771e701a32SChris Mason goto out; 29781e701a32SChris Mason } 29791e701a32SChris Mason 29801e701a32SChris Mason if (argp) { 29811e701a32SChris Mason if (copy_from_user(range, argp, 29821e701a32SChris Mason sizeof(*range))) { 29831e701a32SChris Mason ret = -EFAULT; 29841e701a32SChris Mason kfree(range); 2985683be16eSDan Carpenter goto out; 29861e701a32SChris Mason } 29871e701a32SChris Mason /* compression requires us to start the IO */ 29881e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 29891e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 29901e701a32SChris Mason range->extent_thresh = (u32)-1; 29911e701a32SChris Mason } 29921e701a32SChris Mason } else { 29931e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 29941e701a32SChris Mason range->len = (u64)-1; 29951e701a32SChris Mason } 2996496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 29977c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 29984cb5300bSChris Mason if (ret > 0) 29994cb5300bSChris Mason ret = 0; 30001e701a32SChris Mason kfree(range); 3001f46b5a66SChristoph Hellwig break; 30028929ecfaSYan, Zheng default: 30038929ecfaSYan, Zheng ret = -EINVAL; 3004f46b5a66SChristoph Hellwig } 3005e441d54dSChris Mason out: 300625122d15SIlya Dryomov mnt_drop_write_file(file); 3007e441d54dSChris Mason return ret; 3008f46b5a66SChristoph Hellwig } 3009f46b5a66SChristoph Hellwig 30102ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3011f46b5a66SChristoph Hellwig { 3012f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3013f46b5a66SChristoph Hellwig int ret; 3014f46b5a66SChristoph Hellwig 3015e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3016e441d54dSChris Mason return -EPERM; 3017e441d54dSChris Mason 3018171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) 3019e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3020c9e9f97bSIlya Dryomov 3021dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3022c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3023c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3024c9e9f97bSIlya Dryomov goto out; 3025c9e9f97bSIlya Dryomov } 3026f46b5a66SChristoph Hellwig 30275516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 30282ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3029f46b5a66SChristoph Hellwig 303043d20761SAnand Jain if (!ret) 30310b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 303243d20761SAnand Jain 3033f46b5a66SChristoph Hellwig kfree(vol_args); 3034c9e9f97bSIlya Dryomov out: 3035171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3036f46b5a66SChristoph Hellwig return ret; 3037f46b5a66SChristoph Hellwig } 3038f46b5a66SChristoph Hellwig 30396b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3040f46b5a66SChristoph Hellwig { 30410b246afaSJeff Mahoney struct inode *inode = file_inode(file); 30420b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 30436b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3044f46b5a66SChristoph Hellwig int ret; 3045f46b5a66SChristoph Hellwig 3046e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3047e441d54dSChris Mason return -EPERM; 3048e441d54dSChris Mason 3049da24927bSMiao Xie ret = mnt_want_write_file(file); 3050da24927bSMiao Xie if (ret) 3051da24927bSMiao Xie return ret; 3052c146afadSYan Zheng 3053dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3054c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3055c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3056c47ca32dSDan Carpenter goto err_drop; 3057c9e9f97bSIlya Dryomov } 3058f46b5a66SChristoph Hellwig 30596b526ed7SAnand Jain /* Check for compatibility reject unknown flags */ 3060fd4e994bSOmar Sandoval if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) { 3061fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3062fd4e994bSOmar Sandoval goto out; 3063fd4e994bSOmar Sandoval } 3064f46b5a66SChristoph Hellwig 3065171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3066183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3067183860f6SAnand Jain goto out; 3068183860f6SAnand Jain } 3069183860f6SAnand Jain 3070735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 30712ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 30726b526ed7SAnand Jain } else { 30736b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 30742ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 30756b526ed7SAnand Jain } 3076171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3077183860f6SAnand Jain 30786b526ed7SAnand Jain if (!ret) { 3079735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 30800b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 30816b526ed7SAnand Jain vol_args->devid); 30826b526ed7SAnand Jain else 30830b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 30846b526ed7SAnand Jain vol_args->name); 30856b526ed7SAnand Jain } 3086183860f6SAnand Jain out: 3087183860f6SAnand Jain kfree(vol_args); 3088c47ca32dSDan Carpenter err_drop: 30894ac20c70SIlya Dryomov mnt_drop_write_file(file); 3090f46b5a66SChristoph Hellwig return ret; 3091f46b5a66SChristoph Hellwig } 3092f46b5a66SChristoph Hellwig 3093f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3094f46b5a66SChristoph Hellwig { 30950b246afaSJeff Mahoney struct inode *inode = file_inode(file); 30960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3097f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3098f46b5a66SChristoph Hellwig int ret; 3099f46b5a66SChristoph Hellwig 3100f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3101f46b5a66SChristoph Hellwig return -EPERM; 3102f46b5a66SChristoph Hellwig 3103f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3104f46b5a66SChristoph Hellwig if (ret) 3105f46b5a66SChristoph Hellwig return ret; 3106f46b5a66SChristoph Hellwig 3107171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3108f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 310958d7bbf8SDavid Sterba goto out_drop_write; 311058d7bbf8SDavid Sterba } 311158d7bbf8SDavid Sterba 311258d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 311358d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 311458d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3115f46b5a66SChristoph Hellwig goto out; 3116f46b5a66SChristoph Hellwig } 3117f46b5a66SChristoph Hellwig 311858d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31192ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3120f46b5a66SChristoph Hellwig 3121f46b5a66SChristoph Hellwig if (!ret) 31220b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3123f46b5a66SChristoph Hellwig kfree(vol_args); 312458d7bbf8SDavid Sterba out: 3125171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 312658d7bbf8SDavid Sterba out_drop_write: 3127f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 312858d7bbf8SDavid Sterba 3129f46b5a66SChristoph Hellwig return ret; 3130f46b5a66SChristoph Hellwig } 3131f46b5a66SChristoph Hellwig 31322ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 31332ff7e61eSJeff Mahoney void __user *arg) 3134475f6387SJan Schmidt { 3135027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3136475f6387SJan Schmidt struct btrfs_device *device; 31370b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3138027ed2f0SLi Zefan int ret = 0; 3139475f6387SJan Schmidt 3140027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 3141027ed2f0SLi Zefan if (!fi_args) 3142027ed2f0SLi Zefan return -ENOMEM; 3143027ed2f0SLi Zefan 3144d03262c7SDavid Sterba rcu_read_lock(); 3145027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3146475f6387SJan Schmidt 3147d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3148027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3149027ed2f0SLi Zefan fi_args->max_id = device->devid; 3150475f6387SJan Schmidt } 3151d03262c7SDavid Sterba rcu_read_unlock(); 3152475f6387SJan Schmidt 3153de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3154bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3155bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3156bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 315780a773fbSDavid Sterba 3158027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3159027ed2f0SLi Zefan ret = -EFAULT; 3160475f6387SJan Schmidt 3161027ed2f0SLi Zefan kfree(fi_args); 3162027ed2f0SLi Zefan return ret; 3163475f6387SJan Schmidt } 3164475f6387SJan Schmidt 31652ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 31662ff7e61eSJeff Mahoney void __user *arg) 3167475f6387SJan Schmidt { 3168475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3169475f6387SJan Schmidt struct btrfs_device *dev; 3170475f6387SJan Schmidt int ret = 0; 3171475f6387SJan Schmidt char *s_uuid = NULL; 3172475f6387SJan Schmidt 3173475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3174475f6387SJan Schmidt if (IS_ERR(di_args)) 3175475f6387SJan Schmidt return PTR_ERR(di_args); 3176475f6387SJan Schmidt 3177dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3178475f6387SJan Schmidt s_uuid = di_args->uuid; 3179475f6387SJan Schmidt 3180c5593ca3SDavid Sterba rcu_read_lock(); 31810b246afaSJeff Mahoney dev = btrfs_find_device(fs_info, di_args->devid, s_uuid, NULL); 3182475f6387SJan Schmidt 3183475f6387SJan Schmidt if (!dev) { 3184475f6387SJan Schmidt ret = -ENODEV; 3185475f6387SJan Schmidt goto out; 3186475f6387SJan Schmidt } 3187475f6387SJan Schmidt 3188475f6387SJan Schmidt di_args->devid = dev->devid; 31897cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 31907cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3191475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3192a27202fbSJim Meyering if (dev->name) { 3193672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3194672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3195a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3196a27202fbSJim Meyering } else { 319799ba55adSStefan Behrens di_args->path[0] = '\0'; 3198a27202fbSJim Meyering } 3199475f6387SJan Schmidt 3200475f6387SJan Schmidt out: 3201c5593ca3SDavid Sterba rcu_read_unlock(); 3202475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3203475f6387SJan Schmidt ret = -EFAULT; 3204475f6387SJan Schmidt 3205475f6387SJan Schmidt kfree(di_args); 3206475f6387SJan Schmidt return ret; 3207475f6387SJan Schmidt } 3208475f6387SJan Schmidt 3209f4414602SMark Fasheh static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) 3210416161dbSMark Fasheh { 32115955102cSAl Viro inode_unlock(inode1); 32125955102cSAl Viro inode_unlock(inode2); 3213416161dbSMark Fasheh } 3214416161dbSMark Fasheh 3215f4414602SMark Fasheh static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) 3216f4414602SMark Fasheh { 3217f4414602SMark Fasheh if (inode1 < inode2) 3218f4414602SMark Fasheh swap(inode1, inode2); 3219f4414602SMark Fasheh 32205955102cSAl Viro inode_lock_nested(inode1, I_MUTEX_PARENT); 32215955102cSAl Viro inode_lock_nested(inode2, I_MUTEX_CHILD); 3222f4414602SMark Fasheh } 3223f4414602SMark Fasheh 3224d8b55242SFilipe Manana static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, 3225d8b55242SFilipe Manana struct inode *inode2, u64 loff2, u64 len) 3226d8b55242SFilipe Manana { 3227d8b55242SFilipe Manana unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 3228d8b55242SFilipe Manana unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 3229d8b55242SFilipe Manana } 3230d8b55242SFilipe Manana 3231d8b55242SFilipe Manana static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1, 3232d8b55242SFilipe Manana struct inode *inode2, u64 loff2, u64 len) 3233d8b55242SFilipe Manana { 3234d8b55242SFilipe Manana if (inode1 < inode2) { 3235d8b55242SFilipe Manana swap(inode1, inode2); 3236d8b55242SFilipe Manana swap(loff1, loff2); 3237d8b55242SFilipe Manana } else if (inode1 == inode2 && loff2 < loff1) { 3238d8b55242SFilipe Manana swap(loff1, loff2); 3239d8b55242SFilipe Manana } 3240d8b55242SFilipe Manana lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); 3241d8b55242SFilipe Manana lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); 3242d8b55242SFilipe Manana } 3243d8b55242SFilipe Manana 32443973909dSTimofey Titovets static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen, 324534a28e3dSFilipe Manana struct inode *dst, u64 dst_loff) 3246416161dbSMark Fasheh { 324734a28e3dSFilipe Manana u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; 3248416161dbSMark Fasheh int ret; 3249e1d227a4SMark Fasheh u64 len = olen; 3250416161dbSMark Fasheh 325134a28e3dSFilipe Manana if (loff + len == src->i_size) 325234a28e3dSFilipe Manana len = ALIGN(src->i_size, bs) - loff; 32530efa9f48SMark Fasheh /* 325434a28e3dSFilipe Manana * For same inode case we don't want our length pushed out past i_size 325534a28e3dSFilipe Manana * as comparing that data range makes no sense. 32560efa9f48SMark Fasheh * 325734a28e3dSFilipe Manana * This effectively means we require aligned extents for the single 325834a28e3dSFilipe Manana * inode case, whereas the other cases allow an unaligned length so long 325934a28e3dSFilipe Manana * as it ends at i_size. 32600efa9f48SMark Fasheh */ 326134a28e3dSFilipe Manana if (dst == src && len != olen) 32623973909dSTimofey Titovets return -EINVAL; 32630efa9f48SMark Fasheh 3264de02b9f6SFilipe Manana /* 3265d8b55242SFilipe Manana * Lock destination range to serialize with concurrent readpages() and 3266d8b55242SFilipe Manana * source range to serialize with relocation. 3267de02b9f6SFilipe Manana */ 3268d8b55242SFilipe Manana btrfs_double_extent_lock(src, loff, dst, dst_loff, len); 32691c919a5eSMark Fasheh ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); 3270d8b55242SFilipe Manana btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); 32713973909dSTimofey Titovets 32723973909dSTimofey Titovets return ret; 32733973909dSTimofey Titovets } 32743973909dSTimofey Titovets 3275b6728768STimofey Titovets #define BTRFS_MAX_DEDUPE_LEN SZ_16M 3276b6728768STimofey Titovets 32773973909dSTimofey Titovets static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, 32783973909dSTimofey Titovets struct inode *dst, u64 dst_loff) 32793973909dSTimofey Titovets { 32803973909dSTimofey Titovets int ret; 328167b07bd4STimofey Titovets int num_pages = PAGE_ALIGN(BTRFS_MAX_DEDUPE_LEN) >> PAGE_SHIFT; 3282b6728768STimofey Titovets u64 i, tail_len, chunk_count; 32833973909dSTimofey Titovets 32843973909dSTimofey Titovets /* don't make the dst file partly checksummed */ 32853973909dSTimofey Titovets if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 328634a28e3dSFilipe Manana (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) 328734a28e3dSFilipe Manana return -EINVAL; 32883973909dSTimofey Titovets 328934a28e3dSFilipe Manana if (IS_SWAPFILE(src) || IS_SWAPFILE(dst)) 329034a28e3dSFilipe Manana return -ETXTBSY; 3291eede2bf3SOmar Sandoval 3292b6728768STimofey Titovets tail_len = olen % BTRFS_MAX_DEDUPE_LEN; 3293b6728768STimofey Titovets chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN); 329467b07bd4STimofey Titovets if (chunk_count == 0) 329567b07bd4STimofey Titovets num_pages = PAGE_ALIGN(tail_len) >> PAGE_SHIFT; 329667b07bd4STimofey Titovets 3297b6728768STimofey Titovets for (i = 0; i < chunk_count; i++) { 3298b6728768STimofey Titovets ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN, 329934a28e3dSFilipe Manana dst, dst_loff); 3300b6728768STimofey Titovets if (ret) 330134a28e3dSFilipe Manana return ret; 3302b6728768STimofey Titovets 3303b6728768STimofey Titovets loff += BTRFS_MAX_DEDUPE_LEN; 3304b6728768STimofey Titovets dst_loff += BTRFS_MAX_DEDUPE_LEN; 3305b6728768STimofey Titovets } 3306b6728768STimofey Titovets 3307b6728768STimofey Titovets if (tail_len > 0) 330867b07bd4STimofey Titovets ret = btrfs_extent_same_range(src, loff, tail_len, dst, 330934a28e3dSFilipe Manana dst_loff); 3310416161dbSMark Fasheh 3311416161dbSMark Fasheh return ret; 3312416161dbSMark Fasheh } 3313416161dbSMark Fasheh 3314f82a9901SFilipe Manana static int clone_finish_inode_update(struct btrfs_trans_handle *trans, 3315f82a9901SFilipe Manana struct inode *inode, 3316f82a9901SFilipe Manana u64 endoff, 3317f82a9901SFilipe Manana const u64 destoff, 33181c919a5eSMark Fasheh const u64 olen, 33191c919a5eSMark Fasheh int no_time_update) 3320f82a9901SFilipe Manana { 3321f82a9901SFilipe Manana struct btrfs_root *root = BTRFS_I(inode)->root; 3322f82a9901SFilipe Manana int ret; 3323f82a9901SFilipe Manana 3324f82a9901SFilipe Manana inode_inc_iversion(inode); 33251c919a5eSMark Fasheh if (!no_time_update) 3326c2050a45SDeepa Dinamani inode->i_mtime = inode->i_ctime = current_time(inode); 3327f82a9901SFilipe Manana /* 3328f82a9901SFilipe Manana * We round up to the block size at eof when determining which 3329f82a9901SFilipe Manana * extents to clone above, but shouldn't round up the file size. 3330f82a9901SFilipe Manana */ 3331f82a9901SFilipe Manana if (endoff > destoff + olen) 3332f82a9901SFilipe Manana endoff = destoff + olen; 3333f82a9901SFilipe Manana if (endoff > inode->i_size) 33346ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(inode), endoff); 3335f82a9901SFilipe Manana 3336f82a9901SFilipe Manana ret = btrfs_update_inode(trans, root, inode); 3337f82a9901SFilipe Manana if (ret) { 333866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 33393a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3340f82a9901SFilipe Manana goto out; 3341f82a9901SFilipe Manana } 33423a45bb20SJeff Mahoney ret = btrfs_end_transaction(trans); 3343f82a9901SFilipe Manana out: 3344f82a9901SFilipe Manana return ret; 3345f82a9901SFilipe Manana } 3346f82a9901SFilipe Manana 3347a2f392e4SNikolay Borisov static void clone_update_extent_map(struct btrfs_inode *inode, 33487ffbb598SFilipe Manana const struct btrfs_trans_handle *trans, 33497ffbb598SFilipe Manana const struct btrfs_path *path, 33507ffbb598SFilipe Manana const u64 hole_offset, 33517ffbb598SFilipe Manana const u64 hole_len) 33527ffbb598SFilipe Manana { 3353a2f392e4SNikolay Borisov struct extent_map_tree *em_tree = &inode->extent_tree; 33547ffbb598SFilipe Manana struct extent_map *em; 33557ffbb598SFilipe Manana int ret; 33567ffbb598SFilipe Manana 33577ffbb598SFilipe Manana em = alloc_extent_map(); 33587ffbb598SFilipe Manana if (!em) { 3359a2f392e4SNikolay Borisov set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); 33607ffbb598SFilipe Manana return; 33617ffbb598SFilipe Manana } 33627ffbb598SFilipe Manana 336314f59796SFilipe Manana if (path) { 336414f59796SFilipe Manana struct btrfs_file_extent_item *fi; 336514f59796SFilipe Manana 336614f59796SFilipe Manana fi = btrfs_item_ptr(path->nodes[0], path->slots[0], 336714f59796SFilipe Manana struct btrfs_file_extent_item); 3368a2f392e4SNikolay Borisov btrfs_extent_item_to_extent_map(inode, path, fi, false, em); 33697ffbb598SFilipe Manana em->generation = -1; 33707ffbb598SFilipe Manana if (btrfs_file_extent_type(path->nodes[0], fi) == 33717ffbb598SFilipe Manana BTRFS_FILE_EXTENT_INLINE) 33727ffbb598SFilipe Manana set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, 3373a2f392e4SNikolay Borisov &inode->runtime_flags); 33747ffbb598SFilipe Manana } else { 33757ffbb598SFilipe Manana em->start = hole_offset; 33767ffbb598SFilipe Manana em->len = hole_len; 33777ffbb598SFilipe Manana em->ram_bytes = em->len; 33787ffbb598SFilipe Manana em->orig_start = hole_offset; 33797ffbb598SFilipe Manana em->block_start = EXTENT_MAP_HOLE; 33807ffbb598SFilipe Manana em->block_len = 0; 33817ffbb598SFilipe Manana em->orig_block_len = 0; 33827ffbb598SFilipe Manana em->compress_type = BTRFS_COMPRESS_NONE; 33837ffbb598SFilipe Manana em->generation = trans->transid; 33847ffbb598SFilipe Manana } 33857ffbb598SFilipe Manana 33867ffbb598SFilipe Manana while (1) { 33877ffbb598SFilipe Manana write_lock(&em_tree->lock); 33887ffbb598SFilipe Manana ret = add_extent_mapping(em_tree, em, 1); 33897ffbb598SFilipe Manana write_unlock(&em_tree->lock); 33907ffbb598SFilipe Manana if (ret != -EEXIST) { 33917ffbb598SFilipe Manana free_extent_map(em); 33927ffbb598SFilipe Manana break; 33937ffbb598SFilipe Manana } 3394a2f392e4SNikolay Borisov btrfs_drop_extent_cache(inode, em->start, 33957ffbb598SFilipe Manana em->start + em->len - 1, 0); 33967ffbb598SFilipe Manana } 33977ffbb598SFilipe Manana 3398ee39b432SDavid Sterba if (ret) 3399a2f392e4SNikolay Borisov set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); 34007ffbb598SFilipe Manana } 34017ffbb598SFilipe Manana 34028039d87dSFilipe Manana /* 34038039d87dSFilipe Manana * Make sure we do not end up inserting an inline extent into a file that has 34048039d87dSFilipe Manana * already other (non-inline) extents. If a file has an inline extent it can 34058039d87dSFilipe Manana * not have any other extents and the (single) inline extent must start at the 34068039d87dSFilipe Manana * file offset 0. Failing to respect these rules will lead to file corruption, 34078039d87dSFilipe Manana * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc 34088039d87dSFilipe Manana * 34098039d87dSFilipe Manana * We can have extents that have been already written to disk or we can have 34108039d87dSFilipe Manana * dirty ranges still in delalloc, in which case the extent maps and items are 34118039d87dSFilipe Manana * created only when we run delalloc, and the delalloc ranges might fall outside 34128039d87dSFilipe Manana * the range we are currently locking in the inode's io tree. So we check the 34138039d87dSFilipe Manana * inode's i_size because of that (i_size updates are done while holding the 34148039d87dSFilipe Manana * i_mutex, which we are holding here). 34158039d87dSFilipe Manana * We also check to see if the inode has a size not greater than "datal" but has 34168039d87dSFilipe Manana * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are 34178039d87dSFilipe Manana * protected against such concurrent fallocate calls by the i_mutex). 34188039d87dSFilipe Manana * 34198039d87dSFilipe Manana * If the file has no extents but a size greater than datal, do not allow the 34208039d87dSFilipe Manana * copy because we would need turn the inline extent into a non-inline one (even 34218039d87dSFilipe Manana * with NO_HOLES enabled). If we find our destination inode only has one inline 34228039d87dSFilipe Manana * extent, just overwrite it with the source inline extent if its size is less 34238039d87dSFilipe Manana * than the source extent's size, or we could copy the source inline extent's 34248039d87dSFilipe Manana * data into the destination inode's inline extent if the later is greater then 34258039d87dSFilipe Manana * the former. 34268039d87dSFilipe Manana */ 34274a0ab9d7SDavid Sterba static int clone_copy_inline_extent(struct inode *dst, 34288039d87dSFilipe Manana struct btrfs_trans_handle *trans, 34298039d87dSFilipe Manana struct btrfs_path *path, 34308039d87dSFilipe Manana struct btrfs_key *new_key, 34318039d87dSFilipe Manana const u64 drop_start, 34328039d87dSFilipe Manana const u64 datal, 34338039d87dSFilipe Manana const u64 skip, 34348039d87dSFilipe Manana const u64 size, 34358039d87dSFilipe Manana char *inline_data) 34368039d87dSFilipe Manana { 34370b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb); 34388039d87dSFilipe Manana struct btrfs_root *root = BTRFS_I(dst)->root; 34398039d87dSFilipe Manana const u64 aligned_end = ALIGN(new_key->offset + datal, 34400b246afaSJeff Mahoney fs_info->sectorsize); 34418039d87dSFilipe Manana int ret; 34428039d87dSFilipe Manana struct btrfs_key key; 34438039d87dSFilipe Manana 34448039d87dSFilipe Manana if (new_key->offset > 0) 34458039d87dSFilipe Manana return -EOPNOTSUPP; 34468039d87dSFilipe Manana 34474a0cc7caSNikolay Borisov key.objectid = btrfs_ino(BTRFS_I(dst)); 34488039d87dSFilipe Manana key.type = BTRFS_EXTENT_DATA_KEY; 34498039d87dSFilipe Manana key.offset = 0; 34508039d87dSFilipe Manana ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 34518039d87dSFilipe Manana if (ret < 0) { 34528039d87dSFilipe Manana return ret; 34538039d87dSFilipe Manana } else if (ret > 0) { 34548039d87dSFilipe Manana if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { 34558039d87dSFilipe Manana ret = btrfs_next_leaf(root, path); 34568039d87dSFilipe Manana if (ret < 0) 34578039d87dSFilipe Manana return ret; 34588039d87dSFilipe Manana else if (ret > 0) 34598039d87dSFilipe Manana goto copy_inline_extent; 34608039d87dSFilipe Manana } 34618039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 34624a0cc7caSNikolay Borisov if (key.objectid == btrfs_ino(BTRFS_I(dst)) && 34638039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) { 34648039d87dSFilipe Manana ASSERT(key.offset > 0); 34658039d87dSFilipe Manana return -EOPNOTSUPP; 34668039d87dSFilipe Manana } 34678039d87dSFilipe Manana } else if (i_size_read(dst) <= datal) { 34688039d87dSFilipe Manana struct btrfs_file_extent_item *ei; 34698039d87dSFilipe Manana u64 ext_len; 34708039d87dSFilipe Manana 34718039d87dSFilipe Manana /* 34728039d87dSFilipe Manana * If the file size is <= datal, make sure there are no other 34738039d87dSFilipe Manana * extents following (can happen do to an fallocate call with 34748039d87dSFilipe Manana * the flag FALLOC_FL_KEEP_SIZE). 34758039d87dSFilipe Manana */ 34768039d87dSFilipe Manana ei = btrfs_item_ptr(path->nodes[0], path->slots[0], 34778039d87dSFilipe Manana struct btrfs_file_extent_item); 34788039d87dSFilipe Manana /* 34798039d87dSFilipe Manana * If it's an inline extent, it can not have other extents 34808039d87dSFilipe Manana * following it. 34818039d87dSFilipe Manana */ 34828039d87dSFilipe Manana if (btrfs_file_extent_type(path->nodes[0], ei) == 34838039d87dSFilipe Manana BTRFS_FILE_EXTENT_INLINE) 34848039d87dSFilipe Manana goto copy_inline_extent; 34858039d87dSFilipe Manana 34868039d87dSFilipe Manana ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); 34878039d87dSFilipe Manana if (ext_len > aligned_end) 34888039d87dSFilipe Manana return -EOPNOTSUPP; 34898039d87dSFilipe Manana 34908039d87dSFilipe Manana ret = btrfs_next_item(root, path); 34918039d87dSFilipe Manana if (ret < 0) { 34928039d87dSFilipe Manana return ret; 34938039d87dSFilipe Manana } else if (ret == 0) { 34948039d87dSFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 34958039d87dSFilipe Manana path->slots[0]); 34964a0cc7caSNikolay Borisov if (key.objectid == btrfs_ino(BTRFS_I(dst)) && 34978039d87dSFilipe Manana key.type == BTRFS_EXTENT_DATA_KEY) 34988039d87dSFilipe Manana return -EOPNOTSUPP; 34998039d87dSFilipe Manana } 35008039d87dSFilipe Manana } 35018039d87dSFilipe Manana 35028039d87dSFilipe Manana copy_inline_extent: 35038039d87dSFilipe Manana /* 35048039d87dSFilipe Manana * We have no extent items, or we have an extent at offset 0 which may 35058039d87dSFilipe Manana * or may not be inlined. All these cases are dealt the same way. 35068039d87dSFilipe Manana */ 35078039d87dSFilipe Manana if (i_size_read(dst) > datal) { 35088039d87dSFilipe Manana /* 35098039d87dSFilipe Manana * If the destination inode has an inline extent... 35108039d87dSFilipe Manana * This would require copying the data from the source inline 35118039d87dSFilipe Manana * extent into the beginning of the destination's inline extent. 35128039d87dSFilipe Manana * But this is really complex, both extents can be compressed 35138039d87dSFilipe Manana * or just one of them, which would require decompressing and 35148039d87dSFilipe Manana * re-compressing data (which could increase the new compressed 35158039d87dSFilipe Manana * size, not allowing the compressed data to fit anymore in an 35168039d87dSFilipe Manana * inline extent). 35178039d87dSFilipe Manana * So just don't support this case for now (it should be rare, 35188039d87dSFilipe Manana * we are not really saving space when cloning inline extents). 35198039d87dSFilipe Manana */ 35208039d87dSFilipe Manana return -EOPNOTSUPP; 35218039d87dSFilipe Manana } 35228039d87dSFilipe Manana 35238039d87dSFilipe Manana btrfs_release_path(path); 35248039d87dSFilipe Manana ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); 35258039d87dSFilipe Manana if (ret) 35268039d87dSFilipe Manana return ret; 35278039d87dSFilipe Manana ret = btrfs_insert_empty_item(trans, root, path, new_key, size); 35288039d87dSFilipe Manana if (ret) 35298039d87dSFilipe Manana return ret; 35308039d87dSFilipe Manana 35318039d87dSFilipe Manana if (skip) { 35328039d87dSFilipe Manana const u32 start = btrfs_file_extent_calc_inline_size(0); 35338039d87dSFilipe Manana 35348039d87dSFilipe Manana memmove(inline_data + start, inline_data + start + skip, datal); 35358039d87dSFilipe Manana } 35368039d87dSFilipe Manana 35378039d87dSFilipe Manana write_extent_buffer(path->nodes[0], inline_data, 35388039d87dSFilipe Manana btrfs_item_ptr_offset(path->nodes[0], 35398039d87dSFilipe Manana path->slots[0]), 35408039d87dSFilipe Manana size); 35418039d87dSFilipe Manana inode_add_bytes(dst, datal); 35428039d87dSFilipe Manana 35438039d87dSFilipe Manana return 0; 35448039d87dSFilipe Manana } 35458039d87dSFilipe Manana 354632b7c687SMark Fasheh /** 354732b7c687SMark Fasheh * btrfs_clone() - clone a range from inode file to another 354832b7c687SMark Fasheh * 354932b7c687SMark Fasheh * @src: Inode to clone from 355032b7c687SMark Fasheh * @inode: Inode to clone to 355132b7c687SMark Fasheh * @off: Offset within source to start clone from 355232b7c687SMark Fasheh * @olen: Original length, passed by user, of range to clone 35531c919a5eSMark Fasheh * @olen_aligned: Block-aligned value of olen 355432b7c687SMark Fasheh * @destoff: Offset within @inode to start clone 35551c919a5eSMark Fasheh * @no_time_update: Whether to update mtime/ctime on the target inode 355632b7c687SMark Fasheh */ 355732b7c687SMark Fasheh static int btrfs_clone(struct inode *src, struct inode *inode, 3558f82a9901SFilipe Manana const u64 off, const u64 olen, const u64 olen_aligned, 35591c919a5eSMark Fasheh const u64 destoff, int no_time_update) 3560f46b5a66SChristoph Hellwig { 35610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3562f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 356332b7c687SMark Fasheh struct btrfs_path *path = NULL; 3564f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 356532b7c687SMark Fasheh struct btrfs_trans_handle *trans; 356632b7c687SMark Fasheh char *buf = NULL; 3567ae01a0abSYan Zheng struct btrfs_key key; 3568f46b5a66SChristoph Hellwig u32 nritems; 3569f46b5a66SChristoph Hellwig int slot; 3570ae01a0abSYan Zheng int ret; 3571f82a9901SFilipe Manana const u64 len = olen_aligned; 3572f82a9901SFilipe Manana u64 last_dest_end = destoff; 3573ae01a0abSYan Zheng 3574ae01a0abSYan Zheng ret = -ENOMEM; 3575752ade68SMichal Hocko buf = kvmalloc(fs_info->nodesize, GFP_KERNEL); 3576ae01a0abSYan Zheng if (!buf) 357732b7c687SMark Fasheh return ret; 3578ae01a0abSYan Zheng 3579ae01a0abSYan Zheng path = btrfs_alloc_path(); 3580ae01a0abSYan Zheng if (!path) { 358115351955SDavid Sterba kvfree(buf); 358232b7c687SMark Fasheh return ret; 3583ae01a0abSYan Zheng } 358432b7c687SMark Fasheh 3585e4058b54SDavid Sterba path->reada = READA_FORWARD; 3586c5c9cd4dSSage Weil /* clone data */ 35874a0cc7caSNikolay Borisov key.objectid = btrfs_ino(BTRFS_I(src)); 3588ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 35892c463823SFilipe Manana key.offset = off; 3590f46b5a66SChristoph Hellwig 3591f46b5a66SChristoph Hellwig while (1) { 3592de249e66SChris Mason u64 next_key_min_offset = key.offset + 1; 3593df858e76SFilipe Manana 3594f46b5a66SChristoph Hellwig /* 3595f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 3596f46b5a66SChristoph Hellwig * tree. 3597f46b5a66SChristoph Hellwig */ 3598e4355f34SFilipe David Borba Manana path->leave_spinning = 1; 3599362a20c5SDavid Sterba ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 3600362a20c5SDavid Sterba 0, 0); 3601f46b5a66SChristoph Hellwig if (ret < 0) 3602f46b5a66SChristoph Hellwig goto out; 36032c463823SFilipe Manana /* 36042c463823SFilipe Manana * First search, if no extent item that starts at offset off was 36052c463823SFilipe Manana * found but the previous item is an extent item, it's possible 36062c463823SFilipe Manana * it might overlap our target range, therefore process it. 36072c463823SFilipe Manana */ 36082c463823SFilipe Manana if (key.offset == off && ret > 0 && path->slots[0] > 0) { 36092c463823SFilipe Manana btrfs_item_key_to_cpu(path->nodes[0], &key, 36102c463823SFilipe Manana path->slots[0] - 1); 36112c463823SFilipe Manana if (key.type == BTRFS_EXTENT_DATA_KEY) 36122c463823SFilipe Manana path->slots[0]--; 36132c463823SFilipe Manana } 3614f46b5a66SChristoph Hellwig 3615ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3616e4355f34SFilipe David Borba Manana process_slot: 3617ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 3618362a20c5SDavid Sterba ret = btrfs_next_leaf(BTRFS_I(src)->root, path); 3619f46b5a66SChristoph Hellwig if (ret < 0) 3620f46b5a66SChristoph Hellwig goto out; 3621f46b5a66SChristoph Hellwig if (ret > 0) 3622f46b5a66SChristoph Hellwig break; 3623ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 3624f46b5a66SChristoph Hellwig } 3625f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 3626f46b5a66SChristoph Hellwig slot = path->slots[0]; 3627f46b5a66SChristoph Hellwig 3628ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 3629962a298fSDavid Sterba if (key.type > BTRFS_EXTENT_DATA_KEY || 36304a0cc7caSNikolay Borisov key.objectid != btrfs_ino(BTRFS_I(src))) 3631f46b5a66SChristoph Hellwig break; 3632f46b5a66SChristoph Hellwig 3633962a298fSDavid Sterba if (key.type == BTRFS_EXTENT_DATA_KEY) { 3634c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 3635c5c9cd4dSSage Weil int type; 363631840ae1SZheng Yan u32 size; 363731840ae1SZheng Yan struct btrfs_key new_key; 3638c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 3639c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 3640c5c9cd4dSSage Weil u8 comp; 3641f82a9901SFilipe Manana u64 drop_start; 364231840ae1SZheng Yan 3643c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 3644c5c9cd4dSSage Weil struct btrfs_file_extent_item); 3645c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 3646c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 3647c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3648c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3649d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 3650d397712bSChris Mason extent); 3651d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 3652d397712bSChris Mason extent); 3653c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 3654d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 3655d397712bSChris Mason extent); 3656c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3657c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 3658c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 3659c5c9cd4dSSage Weil extent); 3660c5c9cd4dSSage Weil } 366131840ae1SZheng Yan 36622c463823SFilipe Manana /* 36632c463823SFilipe Manana * The first search might have left us at an extent 36642c463823SFilipe Manana * item that ends before our target range's start, can 36652c463823SFilipe Manana * happen if we have holes and NO_HOLES feature enabled. 36662c463823SFilipe Manana */ 36672c463823SFilipe Manana if (key.offset + datal <= off) { 3668e4355f34SFilipe David Borba Manana path->slots[0]++; 3669e4355f34SFilipe David Borba Manana goto process_slot; 36702c463823SFilipe Manana } else if (key.offset >= off + len) { 36712c463823SFilipe Manana break; 3672e4355f34SFilipe David Borba Manana } 3673df858e76SFilipe Manana next_key_min_offset = key.offset + datal; 3674e4355f34SFilipe David Borba Manana size = btrfs_item_size_nr(leaf, slot); 3675e4355f34SFilipe David Borba Manana read_extent_buffer(leaf, buf, 3676e4355f34SFilipe David Borba Manana btrfs_item_ptr_offset(leaf, slot), 3677e4355f34SFilipe David Borba Manana size); 3678e4355f34SFilipe David Borba Manana 3679e4355f34SFilipe David Borba Manana btrfs_release_path(path); 3680e4355f34SFilipe David Borba Manana path->leave_spinning = 0; 3681c5c9cd4dSSage Weil 368231840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 36834a0cc7caSNikolay Borisov new_key.objectid = btrfs_ino(BTRFS_I(inode)); 36844d728ec7SLi Zefan if (off <= key.offset) 3685c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 36864d728ec7SLi Zefan else 36874d728ec7SLi Zefan new_key.offset = destoff; 3688c5c9cd4dSSage Weil 3689b6f3409bSSage Weil /* 3690f82a9901SFilipe Manana * Deal with a hole that doesn't have an extent item 3691f82a9901SFilipe Manana * that represents it (NO_HOLES feature enabled). 3692f82a9901SFilipe Manana * This hole is either in the middle of the cloning 3693f82a9901SFilipe Manana * range or at the beginning (fully overlaps it or 3694f82a9901SFilipe Manana * partially overlaps it). 3695f82a9901SFilipe Manana */ 3696f82a9901SFilipe Manana if (new_key.offset != last_dest_end) 3697f82a9901SFilipe Manana drop_start = last_dest_end; 3698f82a9901SFilipe Manana else 3699f82a9901SFilipe Manana drop_start = new_key.offset; 3700f82a9901SFilipe Manana 3701f82a9901SFilipe Manana /* 3702b6f3409bSSage Weil * 1 - adjusting old extent (we may have to split it) 3703b6f3409bSSage Weil * 1 - add new extent 3704b6f3409bSSage Weil * 1 - inode update 3705b6f3409bSSage Weil */ 3706b6f3409bSSage Weil trans = btrfs_start_transaction(root, 3); 3707a22285a6SYan, Zheng if (IS_ERR(trans)) { 3708a22285a6SYan, Zheng ret = PTR_ERR(trans); 3709a22285a6SYan, Zheng goto out; 3710a22285a6SYan, Zheng } 3711a22285a6SYan, Zheng 3712c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 3713c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 3714d72c0842SLi Zefan /* 3715d72c0842SLi Zefan * a | --- range to clone ---| b 3716d72c0842SLi Zefan * | ------------- extent ------------- | 3717d72c0842SLi Zefan */ 3718d72c0842SLi Zefan 371993915584SAntonio Ospite /* subtract range b */ 3720d72c0842SLi Zefan if (key.offset + datal > off + len) 3721d72c0842SLi Zefan datal = off + len - key.offset; 3722d72c0842SLi Zefan 372393915584SAntonio Ospite /* subtract range a */ 3724a22285a6SYan, Zheng if (off > key.offset) { 3725a22285a6SYan, Zheng datao += off - key.offset; 3726a22285a6SYan, Zheng datal -= off - key.offset; 3727a22285a6SYan, Zheng } 3728a22285a6SYan, Zheng 37295dc562c5SJosef Bacik ret = btrfs_drop_extents(trans, root, inode, 3730f82a9901SFilipe Manana drop_start, 3731a22285a6SYan, Zheng new_key.offset + datal, 37322671485dSJosef Bacik 1); 373379787eaaSJeff Mahoney if (ret) { 37343f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 373500fdf13aSLiu Bo btrfs_abort_transaction(trans, 373666642832SJeff Mahoney ret); 37373a45bb20SJeff Mahoney btrfs_end_transaction(trans); 373879787eaaSJeff Mahoney goto out; 373979787eaaSJeff Mahoney } 3740a22285a6SYan, Zheng 374131840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 374231840ae1SZheng Yan &new_key, size); 374379787eaaSJeff Mahoney if (ret) { 374466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 37453a45bb20SJeff Mahoney btrfs_end_transaction(trans); 374679787eaaSJeff Mahoney goto out; 374779787eaaSJeff Mahoney } 374831840ae1SZheng Yan 374931840ae1SZheng Yan leaf = path->nodes[0]; 375031840ae1SZheng Yan slot = path->slots[0]; 375131840ae1SZheng Yan write_extent_buffer(leaf, buf, 375231840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 375331840ae1SZheng Yan size); 3754ae01a0abSYan Zheng 3755f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 3756f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 3757c5c9cd4dSSage Weil 3758c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 3759c5c9cd4dSSage Weil if (!disko) 3760c5c9cd4dSSage Weil datao = 0; 3761c5c9cd4dSSage Weil 3762c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 3763c5c9cd4dSSage Weil datao); 3764c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 3765c5c9cd4dSSage Weil datal); 3766fcebe456SJosef Bacik 3767c5c9cd4dSSage Weil if (disko) { 3768c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 37692ff7e61eSJeff Mahoney ret = btrfs_inc_extent_ref(trans, 377084f7d8e6SJosef Bacik root, 37715d4f98a2SYan Zheng disko, diskl, 0, 3772f46b5a66SChristoph Hellwig root->root_key.objectid, 37734a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(inode)), 3774b06c4bf5SFilipe Manana new_key.offset - datao); 377579787eaaSJeff Mahoney if (ret) { 377679787eaaSJeff Mahoney btrfs_abort_transaction(trans, 377779787eaaSJeff Mahoney ret); 37783a45bb20SJeff Mahoney btrfs_end_transaction(trans); 377979787eaaSJeff Mahoney goto out; 378079787eaaSJeff Mahoney 378179787eaaSJeff Mahoney } 3782f46b5a66SChristoph Hellwig } 3783c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 3784c5c9cd4dSSage Weil u64 skip = 0; 3785c5c9cd4dSSage Weil u64 trim = 0; 3786ed958762SFilipe Manana 3787c5c9cd4dSSage Weil if (off > key.offset) { 3788c5c9cd4dSSage Weil skip = off - key.offset; 3789c5c9cd4dSSage Weil new_key.offset += skip; 379031840ae1SZheng Yan } 3791d397712bSChris Mason 3792c5c9cd4dSSage Weil if (key.offset + datal > off + len) 3793c5c9cd4dSSage Weil trim = key.offset + datal - (off + len); 3794d397712bSChris Mason 3795c5c9cd4dSSage Weil if (comp && (skip || trim)) { 3796c5c9cd4dSSage Weil ret = -EINVAL; 37973a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3798c5c9cd4dSSage Weil goto out; 379931840ae1SZheng Yan } 3800c5c9cd4dSSage Weil size -= skip + trim; 3801c5c9cd4dSSage Weil datal -= skip + trim; 3802a22285a6SYan, Zheng 38034a0ab9d7SDavid Sterba ret = clone_copy_inline_extent(inode, 38048039d87dSFilipe Manana trans, path, 38058039d87dSFilipe Manana &new_key, 3806f82a9901SFilipe Manana drop_start, 38078039d87dSFilipe Manana datal, 38088039d87dSFilipe Manana skip, size, buf); 380979787eaaSJeff Mahoney if (ret) { 38103f9e3df8SDavid Sterba if (ret != -EOPNOTSUPP) 38113a29bc09SChris Mason btrfs_abort_transaction(trans, 381279787eaaSJeff Mahoney ret); 38133a45bb20SJeff Mahoney btrfs_end_transaction(trans); 381479787eaaSJeff Mahoney goto out; 381579787eaaSJeff Mahoney } 3816c5c9cd4dSSage Weil leaf = path->nodes[0]; 3817c5c9cd4dSSage Weil slot = path->slots[0]; 3818c5c9cd4dSSage Weil } 3819c5c9cd4dSSage Weil 38207ffbb598SFilipe Manana /* If we have an implicit hole (NO_HOLES feature). */ 38217ffbb598SFilipe Manana if (drop_start < new_key.offset) 3822a2f392e4SNikolay Borisov clone_update_extent_map(BTRFS_I(inode), trans, 382314f59796SFilipe Manana NULL, drop_start, 38247ffbb598SFilipe Manana new_key.offset - drop_start); 38257ffbb598SFilipe Manana 3826a2f392e4SNikolay Borisov clone_update_extent_map(BTRFS_I(inode), trans, 3827a2f392e4SNikolay Borisov path, 0, 0); 38287ffbb598SFilipe Manana 3829c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 3830b3b4aa74SDavid Sterba btrfs_release_path(path); 3831c5c9cd4dSSage Weil 383262e2390eSFilipe Manana last_dest_end = ALIGN(new_key.offset + datal, 38330b246afaSJeff Mahoney fs_info->sectorsize); 3834f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, 3835f82a9901SFilipe Manana last_dest_end, 38361c919a5eSMark Fasheh destoff, olen, 38371c919a5eSMark Fasheh no_time_update); 3838f82a9901SFilipe Manana if (ret) 383979787eaaSJeff Mahoney goto out; 38402c463823SFilipe Manana if (new_key.offset + datal >= destoff + len) 38412c463823SFilipe Manana break; 3842a22285a6SYan, Zheng } 3843b3b4aa74SDavid Sterba btrfs_release_path(path); 3844df858e76SFilipe Manana key.offset = next_key_min_offset; 384569ae5e44SWang Xiaoguang 384669ae5e44SWang Xiaoguang if (fatal_signal_pending(current)) { 384769ae5e44SWang Xiaoguang ret = -EINTR; 384869ae5e44SWang Xiaoguang goto out; 384969ae5e44SWang Xiaoguang } 3850ae01a0abSYan Zheng } 3851f46b5a66SChristoph Hellwig ret = 0; 385232b7c687SMark Fasheh 3853f82a9901SFilipe Manana if (last_dest_end < destoff + len) { 3854f82a9901SFilipe Manana /* 3855f82a9901SFilipe Manana * We have an implicit hole (NO_HOLES feature is enabled) that 3856f82a9901SFilipe Manana * fully or partially overlaps our cloning range at its end. 3857f82a9901SFilipe Manana */ 3858b3b4aa74SDavid Sterba btrfs_release_path(path); 3859f82a9901SFilipe Manana 3860f82a9901SFilipe Manana /* 3861f82a9901SFilipe Manana * 1 - remove extent(s) 3862f82a9901SFilipe Manana * 1 - inode update 3863f82a9901SFilipe Manana */ 3864f82a9901SFilipe Manana trans = btrfs_start_transaction(root, 2); 3865f82a9901SFilipe Manana if (IS_ERR(trans)) { 3866f82a9901SFilipe Manana ret = PTR_ERR(trans); 3867f82a9901SFilipe Manana goto out; 3868f82a9901SFilipe Manana } 3869f82a9901SFilipe Manana ret = btrfs_drop_extents(trans, root, inode, 3870f82a9901SFilipe Manana last_dest_end, destoff + len, 1); 3871f82a9901SFilipe Manana if (ret) { 3872f82a9901SFilipe Manana if (ret != -EOPNOTSUPP) 387366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 38743a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3875f82a9901SFilipe Manana goto out; 3876f82a9901SFilipe Manana } 3877a2f392e4SNikolay Borisov clone_update_extent_map(BTRFS_I(inode), trans, NULL, 3878a2f392e4SNikolay Borisov last_dest_end, 387914f59796SFilipe Manana destoff + len - last_dest_end); 3880f82a9901SFilipe Manana ret = clone_finish_inode_update(trans, inode, destoff + len, 38811c919a5eSMark Fasheh destoff, olen, no_time_update); 3882f82a9901SFilipe Manana } 3883f82a9901SFilipe Manana 3884f46b5a66SChristoph Hellwig out: 388532b7c687SMark Fasheh btrfs_free_path(path); 388615351955SDavid Sterba kvfree(buf); 388732b7c687SMark Fasheh return ret; 388832b7c687SMark Fasheh } 388932b7c687SMark Fasheh 38903db11b2eSZach Brown static noinline int btrfs_clone_files(struct file *file, struct file *file_src, 389132b7c687SMark Fasheh u64 off, u64 olen, u64 destoff) 389232b7c687SMark Fasheh { 389354563d41SAl Viro struct inode *inode = file_inode(file); 38943db11b2eSZach Brown struct inode *src = file_inode(file_src); 38950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 389632b7c687SMark Fasheh int ret; 389732b7c687SMark Fasheh u64 len = olen; 38980b246afaSJeff Mahoney u64 bs = fs_info->sb->s_blocksize; 389932b7c687SMark Fasheh 390032b7c687SMark Fasheh /* 390132b7c687SMark Fasheh * TODO: 390232b7c687SMark Fasheh * - split compressed inline extents. annoying: we need to 390332b7c687SMark Fasheh * decompress into destination's address_space (the file offset 390432b7c687SMark Fasheh * may change, so source mapping won't do), then recompress (or 390532b7c687SMark Fasheh * otherwise reinsert) a subrange. 390600fdf13aSLiu Bo * 390700fdf13aSLiu Bo * - split destination inode's inline extents. The inline extents can 390800fdf13aSLiu Bo * be either compressed or non-compressed. 390932b7c687SMark Fasheh */ 391032b7c687SMark Fasheh 3911b5c40d59SOmar Sandoval /* don't make the dst file partly checksummed */ 3912b5c40d59SOmar Sandoval if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != 391334a28e3dSFilipe Manana (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) 391434a28e3dSFilipe Manana return -EINVAL; 3915b5c40d59SOmar Sandoval 391634a28e3dSFilipe Manana if (IS_SWAPFILE(src) || IS_SWAPFILE(inode)) 391734a28e3dSFilipe Manana return -ETXTBSY; 3918eede2bf3SOmar Sandoval 3919ac765f83SFilipe Manana /* 392034a28e3dSFilipe Manana * VFS's generic_remap_file_range_prep() protects us from cloning the 392134a28e3dSFilipe Manana * eof block into the middle of a file, which would result in corruption 392234a28e3dSFilipe Manana * if the file size is not blocksize aligned. So we don't need to check 392334a28e3dSFilipe Manana * for that case here. 3924ac765f83SFilipe Manana */ 392534a28e3dSFilipe Manana if (off + len == src->i_size) 392632b7c687SMark Fasheh len = ALIGN(src->i_size, bs) - off; 392732b7c687SMark Fasheh 392832b7c687SMark Fasheh if (destoff > inode->i_size) { 3929f7fa1107SFilipe Manana const u64 wb_start = ALIGN_DOWN(inode->i_size, bs); 3930f7fa1107SFilipe Manana 393132b7c687SMark Fasheh ret = btrfs_cont_expand(inode, inode->i_size, destoff); 393232b7c687SMark Fasheh if (ret) 393334a28e3dSFilipe Manana return ret; 3934f7fa1107SFilipe Manana /* 3935f7fa1107SFilipe Manana * We may have truncated the last block if the inode's size is 3936f7fa1107SFilipe Manana * not sector size aligned, so we need to wait for writeback to 3937f7fa1107SFilipe Manana * complete before proceeding further, otherwise we can race 3938f7fa1107SFilipe Manana * with cloning and attempt to increment a reference to an 3939f7fa1107SFilipe Manana * extent that no longer exists (writeback completed right after 3940f7fa1107SFilipe Manana * we found the previous extent covering eof and before we 3941f7fa1107SFilipe Manana * attempted to increment its reference count). 3942f7fa1107SFilipe Manana */ 3943f7fa1107SFilipe Manana ret = btrfs_wait_ordered_range(inode, wb_start, 3944f7fa1107SFilipe Manana destoff - wb_start); 3945f7fa1107SFilipe Manana if (ret) 3946f7fa1107SFilipe Manana return ret; 394732b7c687SMark Fasheh } 394832b7c687SMark Fasheh 3949c125b8bfSFilipe Manana /* 3950d8b55242SFilipe Manana * Lock destination range to serialize with concurrent readpages() and 3951d8b55242SFilipe Manana * source range to serialize with relocation. 3952c125b8bfSFilipe Manana */ 3953d8b55242SFilipe Manana btrfs_double_extent_lock(src, off, inode, destoff, len); 39541c919a5eSMark Fasheh ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); 3955d8b55242SFilipe Manana btrfs_double_extent_unlock(src, off, inode, destoff, len); 3956c125b8bfSFilipe Manana /* 3957c125b8bfSFilipe Manana * Truncate page cache pages so that future reads will see the cloned 3958c125b8bfSFilipe Manana * data immediately and not the previous data. 3959c125b8bfSFilipe Manana */ 396065bfa658SChandan Rajendra truncate_inode_pages_range(&inode->i_data, 396109cbfeafSKirill A. Shutemov round_down(destoff, PAGE_SIZE), 396209cbfeafSKirill A. Shutemov round_up(destoff + len, PAGE_SIZE) - 1); 396334a28e3dSFilipe Manana 396434a28e3dSFilipe Manana return ret; 396534a28e3dSFilipe Manana } 396634a28e3dSFilipe Manana 396734a28e3dSFilipe Manana static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in, 396834a28e3dSFilipe Manana struct file *file_out, loff_t pos_out, 396934a28e3dSFilipe Manana loff_t *len, unsigned int remap_flags) 397034a28e3dSFilipe Manana { 397134a28e3dSFilipe Manana struct inode *inode_in = file_inode(file_in); 397234a28e3dSFilipe Manana struct inode *inode_out = file_inode(file_out); 397334a28e3dSFilipe Manana u64 bs = BTRFS_I(inode_out)->root->fs_info->sb->s_blocksize; 397434a28e3dSFilipe Manana bool same_inode = inode_out == inode_in; 397534a28e3dSFilipe Manana u64 wb_len; 397634a28e3dSFilipe Manana int ret; 397734a28e3dSFilipe Manana 397834a28e3dSFilipe Manana if (!(remap_flags & REMAP_FILE_DEDUP)) { 397934a28e3dSFilipe Manana struct btrfs_root *root_out = BTRFS_I(inode_out)->root; 398034a28e3dSFilipe Manana 398134a28e3dSFilipe Manana if (btrfs_root_readonly(root_out)) 398234a28e3dSFilipe Manana return -EROFS; 398334a28e3dSFilipe Manana 398434a28e3dSFilipe Manana if (file_in->f_path.mnt != file_out->f_path.mnt || 398534a28e3dSFilipe Manana inode_in->i_sb != inode_out->i_sb) 398634a28e3dSFilipe Manana return -EXDEV; 398734a28e3dSFilipe Manana } 398834a28e3dSFilipe Manana 398934a28e3dSFilipe Manana if (same_inode) 399034a28e3dSFilipe Manana inode_lock(inode_in); 3991293a8489SMark Fasheh else 399234a28e3dSFilipe Manana btrfs_double_inode_lock(inode_in, inode_out); 399334a28e3dSFilipe Manana 399434a28e3dSFilipe Manana /* 399534a28e3dSFilipe Manana * Now that the inodes are locked, we need to start writeback ourselves 399634a28e3dSFilipe Manana * and can not rely on the writeback from the VFS's generic helper 399734a28e3dSFilipe Manana * generic_remap_file_range_prep() because: 399834a28e3dSFilipe Manana * 399934a28e3dSFilipe Manana * 1) For compression we must call filemap_fdatawrite_range() range 400034a28e3dSFilipe Manana * twice (btrfs_fdatawrite_range() does it for us), and the generic 400134a28e3dSFilipe Manana * helper only calls it once; 400234a28e3dSFilipe Manana * 400334a28e3dSFilipe Manana * 2) filemap_fdatawrite_range(), called by the generic helper only 400434a28e3dSFilipe Manana * waits for the writeback to complete, i.e. for IO to be done, and 400534a28e3dSFilipe Manana * not for the ordered extents to complete. We need to wait for them 400634a28e3dSFilipe Manana * to complete so that new file extent items are in the fs tree. 400734a28e3dSFilipe Manana */ 400834a28e3dSFilipe Manana if (*len == 0 && !(remap_flags & REMAP_FILE_DEDUP)) 400934a28e3dSFilipe Manana wb_len = ALIGN(inode_in->i_size, bs) - ALIGN_DOWN(pos_in, bs); 401034a28e3dSFilipe Manana else 401134a28e3dSFilipe Manana wb_len = ALIGN(*len, bs); 401234a28e3dSFilipe Manana 401334a28e3dSFilipe Manana /* 401434a28e3dSFilipe Manana * Since we don't lock ranges, wait for ongoing lockless dio writes (as 401534a28e3dSFilipe Manana * any in progress could create its ordered extents after we wait for 401634a28e3dSFilipe Manana * existing ordered extents below). 401734a28e3dSFilipe Manana */ 401834a28e3dSFilipe Manana inode_dio_wait(inode_in); 401934a28e3dSFilipe Manana if (!same_inode) 402034a28e3dSFilipe Manana inode_dio_wait(inode_out); 402134a28e3dSFilipe Manana 402234a28e3dSFilipe Manana ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs), 402334a28e3dSFilipe Manana wb_len); 402434a28e3dSFilipe Manana if (ret < 0) 402534a28e3dSFilipe Manana goto out_unlock; 402634a28e3dSFilipe Manana ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs), 402734a28e3dSFilipe Manana wb_len); 402834a28e3dSFilipe Manana if (ret < 0) 402934a28e3dSFilipe Manana goto out_unlock; 403034a28e3dSFilipe Manana 403134a28e3dSFilipe Manana ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, 403234a28e3dSFilipe Manana len, remap_flags); 403334a28e3dSFilipe Manana if (ret < 0 || *len == 0) 403434a28e3dSFilipe Manana goto out_unlock; 403534a28e3dSFilipe Manana 403634a28e3dSFilipe Manana return 0; 403734a28e3dSFilipe Manana 403834a28e3dSFilipe Manana out_unlock: 403934a28e3dSFilipe Manana if (same_inode) 404034a28e3dSFilipe Manana inode_unlock(inode_in); 404134a28e3dSFilipe Manana else 404234a28e3dSFilipe Manana btrfs_double_inode_unlock(inode_in, inode_out); 404334a28e3dSFilipe Manana 40443db11b2eSZach Brown return ret; 40453db11b2eSZach Brown } 40463db11b2eSZach Brown 404742ec3d4cSDarrick J. Wong loff_t btrfs_remap_file_range(struct file *src_file, loff_t off, 404842ec3d4cSDarrick J. Wong struct file *dst_file, loff_t destoff, loff_t len, 40492e5dfc99SDarrick J. Wong unsigned int remap_flags) 40503db11b2eSZach Brown { 405134a28e3dSFilipe Manana struct inode *src_inode = file_inode(src_file); 405234a28e3dSFilipe Manana struct inode *dst_inode = file_inode(dst_file); 405334a28e3dSFilipe Manana bool same_inode = dst_inode == src_inode; 405442ec3d4cSDarrick J. Wong int ret; 405542ec3d4cSDarrick J. Wong 40562e5dfc99SDarrick J. Wong if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY)) 40572e5dfc99SDarrick J. Wong return -EINVAL; 40582e5dfc99SDarrick J. Wong 405934a28e3dSFilipe Manana ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff, 406034a28e3dSFilipe Manana &len, remap_flags); 406134a28e3dSFilipe Manana if (ret < 0 || len == 0) 406234a28e3dSFilipe Manana return ret; 40632e5dfc99SDarrick J. Wong 406434a28e3dSFilipe Manana if (remap_flags & REMAP_FILE_DEDUP) 406534a28e3dSFilipe Manana ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff); 406634a28e3dSFilipe Manana else 406742ec3d4cSDarrick J. Wong ret = btrfs_clone_files(dst_file, src_file, off, len, destoff); 406834a28e3dSFilipe Manana 406934a28e3dSFilipe Manana if (same_inode) 407034a28e3dSFilipe Manana inode_unlock(src_inode); 407134a28e3dSFilipe Manana else 407234a28e3dSFilipe Manana btrfs_double_inode_unlock(src_inode, dst_inode); 407334a28e3dSFilipe Manana 407442ec3d4cSDarrick J. Wong return ret < 0 ? ret : len; 4075c5c9cd4dSSage Weil } 4076c5c9cd4dSSage Weil 40776ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 40786ef5ed0dSJosef Bacik { 4079496ad9aaSAl Viro struct inode *inode = file_inode(file); 40800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 40816ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 40826ef5ed0dSJosef Bacik struct btrfs_root *new_root; 40836ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 40846ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 40856ef5ed0dSJosef Bacik struct btrfs_path *path; 40866ef5ed0dSJosef Bacik struct btrfs_key location; 40876ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 40886ef5ed0dSJosef Bacik u64 objectid = 0; 40896ef5ed0dSJosef Bacik u64 dir_id; 40903c04ce01SMiao Xie int ret; 40916ef5ed0dSJosef Bacik 40926ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 40936ef5ed0dSJosef Bacik return -EPERM; 40946ef5ed0dSJosef Bacik 40953c04ce01SMiao Xie ret = mnt_want_write_file(file); 40963c04ce01SMiao Xie if (ret) 40973c04ce01SMiao Xie return ret; 40983c04ce01SMiao Xie 40993c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 41003c04ce01SMiao Xie ret = -EFAULT; 41013c04ce01SMiao Xie goto out; 41023c04ce01SMiao Xie } 41036ef5ed0dSJosef Bacik 41046ef5ed0dSJosef Bacik if (!objectid) 41051cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 41066ef5ed0dSJosef Bacik 41076ef5ed0dSJosef Bacik location.objectid = objectid; 41086ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 41096ef5ed0dSJosef Bacik location.offset = (u64)-1; 41106ef5ed0dSJosef Bacik 41110b246afaSJeff Mahoney new_root = btrfs_read_fs_root_no_name(fs_info, &location); 41123c04ce01SMiao Xie if (IS_ERR(new_root)) { 41133c04ce01SMiao Xie ret = PTR_ERR(new_root); 41143c04ce01SMiao Xie goto out; 41153c04ce01SMiao Xie } 41164fd786e6SMisono Tomohiro if (!is_fstree(new_root->root_key.objectid)) { 41176d6d2829Ssatoru takeuchi ret = -ENOENT; 41186d6d2829Ssatoru takeuchi goto out; 41196d6d2829Ssatoru takeuchi } 41206ef5ed0dSJosef Bacik 41216ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 41223c04ce01SMiao Xie if (!path) { 41233c04ce01SMiao Xie ret = -ENOMEM; 41243c04ce01SMiao Xie goto out; 41253c04ce01SMiao Xie } 41266ef5ed0dSJosef Bacik path->leave_spinning = 1; 41276ef5ed0dSJosef Bacik 41286ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 412998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 41306ef5ed0dSJosef Bacik btrfs_free_path(path); 41313c04ce01SMiao Xie ret = PTR_ERR(trans); 41323c04ce01SMiao Xie goto out; 41336ef5ed0dSJosef Bacik } 41346ef5ed0dSJosef Bacik 41350b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 41360b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 41376ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 4138cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 41396ef5ed0dSJosef Bacik btrfs_free_path(path); 41403a45bb20SJeff Mahoney btrfs_end_transaction(trans); 41410b246afaSJeff Mahoney btrfs_err(fs_info, 41425d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 41433c04ce01SMiao Xie ret = -ENOENT; 41443c04ce01SMiao Xie goto out; 41456ef5ed0dSJosef Bacik } 41466ef5ed0dSJosef Bacik 41476ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 41486ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 41496ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 41506ef5ed0dSJosef Bacik btrfs_free_path(path); 41516ef5ed0dSJosef Bacik 41520b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 41533a45bb20SJeff Mahoney btrfs_end_transaction(trans); 41543c04ce01SMiao Xie out: 41553c04ce01SMiao Xie mnt_drop_write_file(file); 41563c04ce01SMiao Xie return ret; 41576ef5ed0dSJosef Bacik } 41586ef5ed0dSJosef Bacik 4159c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 4160bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 4161bf5fc093SJosef Bacik { 4162bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 4163bf5fc093SJosef Bacik 4164bf5fc093SJosef Bacik space->total_bytes = 0; 4165bf5fc093SJosef Bacik space->used_bytes = 0; 4166bf5fc093SJosef Bacik space->flags = 0; 4167bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 4168bf5fc093SJosef Bacik space->flags = block_group->flags; 4169bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 4170bf5fc093SJosef Bacik space->used_bytes += 4171bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 4172bf5fc093SJosef Bacik } 4173bf5fc093SJosef Bacik } 4174bf5fc093SJosef Bacik 41752ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 41762ff7e61eSJeff Mahoney void __user *arg) 41771406e432SJosef Bacik { 41781406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 41791406e432SJosef Bacik struct btrfs_ioctl_space_info space; 41801406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 41817fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 418213f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 41831406e432SJosef Bacik struct btrfs_space_info *info; 4184315d8e98SColin Ian King static const u64 types[] = { 4185315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 4186bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 4187bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 4188315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 4189315d8e98SColin Ian King }; 4190bf5fc093SJosef Bacik int num_types = 4; 41917fde62bfSChris Mason int alloc_size; 41921406e432SJosef Bacik int ret = 0; 419351788b1bSDan Rosenberg u64 slot_count = 0; 4194bf5fc093SJosef Bacik int i, c; 41951406e432SJosef Bacik 41961406e432SJosef Bacik if (copy_from_user(&space_args, 41971406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 41981406e432SJosef Bacik sizeof(space_args))) 41991406e432SJosef Bacik return -EFAULT; 42001406e432SJosef Bacik 4201bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4202bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4203bf5fc093SJosef Bacik 4204bf5fc093SJosef Bacik info = NULL; 42057fde62bfSChris Mason rcu_read_lock(); 42060b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 4207bf5fc093SJosef Bacik list) { 4208bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4209bf5fc093SJosef Bacik info = tmp; 4210bf5fc093SJosef Bacik break; 4211bf5fc093SJosef Bacik } 4212bf5fc093SJosef Bacik } 42137fde62bfSChris Mason rcu_read_unlock(); 42141406e432SJosef Bacik 4215bf5fc093SJosef Bacik if (!info) 4216bf5fc093SJosef Bacik continue; 4217bf5fc093SJosef Bacik 4218bf5fc093SJosef Bacik down_read(&info->groups_sem); 4219bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4220bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 4221bf5fc093SJosef Bacik slot_count++; 4222bf5fc093SJosef Bacik } 4223bf5fc093SJosef Bacik up_read(&info->groups_sem); 4224bf5fc093SJosef Bacik } 4225bf5fc093SJosef Bacik 422636523e95SDavid Sterba /* 422736523e95SDavid Sterba * Global block reserve, exported as a space_info 422836523e95SDavid Sterba */ 422936523e95SDavid Sterba slot_count++; 423036523e95SDavid Sterba 42317fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 42327fde62bfSChris Mason if (space_args.space_slots == 0) { 42337fde62bfSChris Mason space_args.total_spaces = slot_count; 42347fde62bfSChris Mason goto out; 42357fde62bfSChris Mason } 4236bf5fc093SJosef Bacik 423751788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 4238bf5fc093SJosef Bacik 42397fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 4240bf5fc093SJosef Bacik 42417fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 42427fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 42437fde62bfSChris Mason */ 424409cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 42457fde62bfSChris Mason return -ENOMEM; 42467fde62bfSChris Mason 42477fde62bfSChris Mason space_args.total_spaces = 0; 42488d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 42497fde62bfSChris Mason if (!dest) 42507fde62bfSChris Mason return -ENOMEM; 42517fde62bfSChris Mason dest_orig = dest; 42527fde62bfSChris Mason 42537fde62bfSChris Mason /* now we have a buffer to copy into */ 4254bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 4255bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 4256bf5fc093SJosef Bacik 425751788b1bSDan Rosenberg if (!slot_count) 425851788b1bSDan Rosenberg break; 425951788b1bSDan Rosenberg 4260bf5fc093SJosef Bacik info = NULL; 42611406e432SJosef Bacik rcu_read_lock(); 42620b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 4263bf5fc093SJosef Bacik list) { 4264bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 4265bf5fc093SJosef Bacik info = tmp; 42667fde62bfSChris Mason break; 4267bf5fc093SJosef Bacik } 4268bf5fc093SJosef Bacik } 4269bf5fc093SJosef Bacik rcu_read_unlock(); 42707fde62bfSChris Mason 4271bf5fc093SJosef Bacik if (!info) 4272bf5fc093SJosef Bacik continue; 4273bf5fc093SJosef Bacik down_read(&info->groups_sem); 4274bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 4275bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 4276c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 4277c065f5b1SSu Yue &space); 42787fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 42791406e432SJosef Bacik dest++; 42801406e432SJosef Bacik space_args.total_spaces++; 428151788b1bSDan Rosenberg slot_count--; 42821406e432SJosef Bacik } 428351788b1bSDan Rosenberg if (!slot_count) 428451788b1bSDan Rosenberg break; 4285bf5fc093SJosef Bacik } 4286bf5fc093SJosef Bacik up_read(&info->groups_sem); 4287bf5fc093SJosef Bacik } 42881406e432SJosef Bacik 428936523e95SDavid Sterba /* 429036523e95SDavid Sterba * Add global block reserve 429136523e95SDavid Sterba */ 429236523e95SDavid Sterba if (slot_count) { 42930b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 429436523e95SDavid Sterba 429536523e95SDavid Sterba spin_lock(&block_rsv->lock); 429636523e95SDavid Sterba space.total_bytes = block_rsv->size; 429736523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 429836523e95SDavid Sterba spin_unlock(&block_rsv->lock); 429936523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 430036523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 430136523e95SDavid Sterba space_args.total_spaces++; 430236523e95SDavid Sterba } 430336523e95SDavid Sterba 43042eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 43057fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 43067fde62bfSChris Mason 43077fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 43087fde62bfSChris Mason ret = -EFAULT; 43097fde62bfSChris Mason 43107fde62bfSChris Mason kfree(dest_orig); 43117fde62bfSChris Mason out: 43127fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 43131406e432SJosef Bacik ret = -EFAULT; 43141406e432SJosef Bacik 43151406e432SJosef Bacik return ret; 43161406e432SJosef Bacik } 43171406e432SJosef Bacik 43189a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 43199a8c28beSMiao Xie void __user *argp) 432046204592SSage Weil { 432146204592SSage Weil struct btrfs_trans_handle *trans; 432246204592SSage Weil u64 transid; 4323db5b493aSTsutomu Itoh int ret; 432446204592SSage Weil 4325d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4326ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4327ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 432898d5dc13STsutomu Itoh return PTR_ERR(trans); 4329ff7c1d33SMiao Xie 4330ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4331ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4332ff7c1d33SMiao Xie goto out; 4333ff7c1d33SMiao Xie } 433446204592SSage Weil transid = trans->transid; 43353a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 43368b2b2d3cSTsutomu Itoh if (ret) { 43373a45bb20SJeff Mahoney btrfs_end_transaction(trans); 4338db5b493aSTsutomu Itoh return ret; 43398b2b2d3cSTsutomu Itoh } 4340ff7c1d33SMiao Xie out: 434146204592SSage Weil if (argp) 434246204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 434346204592SSage Weil return -EFAULT; 434446204592SSage Weil return 0; 434546204592SSage Weil } 434646204592SSage Weil 43472ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 43489a8c28beSMiao Xie void __user *argp) 434946204592SSage Weil { 435046204592SSage Weil u64 transid; 435146204592SSage Weil 435246204592SSage Weil if (argp) { 435346204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 435446204592SSage Weil return -EFAULT; 435546204592SSage Weil } else { 435646204592SSage Weil transid = 0; /* current trans */ 435746204592SSage Weil } 43582ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 435946204592SSage Weil } 436046204592SSage Weil 4361b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4362475f6387SJan Schmidt { 43630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 4364475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4365b8e95489SMiao Xie int ret; 4366475f6387SJan Schmidt 4367475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4368475f6387SJan Schmidt return -EPERM; 4369475f6387SJan Schmidt 4370475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4371475f6387SJan Schmidt if (IS_ERR(sa)) 4372475f6387SJan Schmidt return PTR_ERR(sa); 4373475f6387SJan Schmidt 4374b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4375b8e95489SMiao Xie ret = mnt_want_write_file(file); 4376b8e95489SMiao Xie if (ret) 4377b8e95489SMiao Xie goto out; 4378b8e95489SMiao Xie } 4379b8e95489SMiao Xie 43800b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 438163a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 438263a212abSStefan Behrens 0); 4383475f6387SJan Schmidt 438406fe39abSFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4385475f6387SJan Schmidt ret = -EFAULT; 4386475f6387SJan Schmidt 4387b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4388b8e95489SMiao Xie mnt_drop_write_file(file); 4389b8e95489SMiao Xie out: 4390475f6387SJan Schmidt kfree(sa); 4391475f6387SJan Schmidt return ret; 4392475f6387SJan Schmidt } 4393475f6387SJan Schmidt 43942ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 4395475f6387SJan Schmidt { 4396475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4397475f6387SJan Schmidt return -EPERM; 4398475f6387SJan Schmidt 43992ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 4400475f6387SJan Schmidt } 4401475f6387SJan Schmidt 44022ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 4403475f6387SJan Schmidt void __user *arg) 4404475f6387SJan Schmidt { 4405475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4406475f6387SJan Schmidt int ret; 4407475f6387SJan Schmidt 4408475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4409475f6387SJan Schmidt return -EPERM; 4410475f6387SJan Schmidt 4411475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4412475f6387SJan Schmidt if (IS_ERR(sa)) 4413475f6387SJan Schmidt return PTR_ERR(sa); 4414475f6387SJan Schmidt 44152ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 4416475f6387SJan Schmidt 44174fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4418475f6387SJan Schmidt ret = -EFAULT; 4419475f6387SJan Schmidt 4420475f6387SJan Schmidt kfree(sa); 4421475f6387SJan Schmidt return ret; 4422475f6387SJan Schmidt } 4423475f6387SJan Schmidt 44242ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 4425b27f7c0cSDavid Sterba void __user *arg) 4426c11d2c23SStefan Behrens { 4427c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4428c11d2c23SStefan Behrens int ret; 4429c11d2c23SStefan Behrens 4430c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4431c11d2c23SStefan Behrens if (IS_ERR(sa)) 4432c11d2c23SStefan Behrens return PTR_ERR(sa); 4433c11d2c23SStefan Behrens 4434b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4435b27f7c0cSDavid Sterba kfree(sa); 4436b27f7c0cSDavid Sterba return -EPERM; 4437b27f7c0cSDavid Sterba } 4438b27f7c0cSDavid Sterba 44392ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4440c11d2c23SStefan Behrens 4441eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4442c11d2c23SStefan Behrens ret = -EFAULT; 4443c11d2c23SStefan Behrens 4444c11d2c23SStefan Behrens kfree(sa); 4445c11d2c23SStefan Behrens return ret; 4446c11d2c23SStefan Behrens } 4447c11d2c23SStefan Behrens 44482ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 44492ff7e61eSJeff Mahoney void __user *arg) 44503f6bcfbdSStefan Behrens { 44513f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 44523f6bcfbdSStefan Behrens int ret; 44533f6bcfbdSStefan Behrens 44543f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 44553f6bcfbdSStefan Behrens return -EPERM; 44563f6bcfbdSStefan Behrens 44573f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 44583f6bcfbdSStefan Behrens if (IS_ERR(p)) 44593f6bcfbdSStefan Behrens return PTR_ERR(p); 44603f6bcfbdSStefan Behrens 44613f6bcfbdSStefan Behrens switch (p->cmd) { 44623f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4463bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4464adfa97cbSIlya Dryomov ret = -EROFS; 4465adfa97cbSIlya Dryomov goto out; 4466adfa97cbSIlya Dryomov } 4467171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 4468e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 44693f6bcfbdSStefan Behrens } else { 44702ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4471171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 44723f6bcfbdSStefan Behrens } 44733f6bcfbdSStefan Behrens break; 44743f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 44750b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 44763f6bcfbdSStefan Behrens ret = 0; 44773f6bcfbdSStefan Behrens break; 44783f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 447917d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 448097282031SAnand Jain ret = 0; 44813f6bcfbdSStefan Behrens break; 44823f6bcfbdSStefan Behrens default: 44833f6bcfbdSStefan Behrens ret = -EINVAL; 44843f6bcfbdSStefan Behrens break; 44853f6bcfbdSStefan Behrens } 44863f6bcfbdSStefan Behrens 44873f6bcfbdSStefan Behrens if (copy_to_user(arg, p, sizeof(*p))) 44883f6bcfbdSStefan Behrens ret = -EFAULT; 4489adfa97cbSIlya Dryomov out: 44903f6bcfbdSStefan Behrens kfree(p); 44913f6bcfbdSStefan Behrens return ret; 44923f6bcfbdSStefan Behrens } 44933f6bcfbdSStefan Behrens 4494d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4495d7728c96SJan Schmidt { 4496d7728c96SJan Schmidt int ret = 0; 4497d7728c96SJan Schmidt int i; 4498740c3d22SChris Mason u64 rel_ptr; 4499d7728c96SJan Schmidt int size; 4500806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4501d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4502d7728c96SJan Schmidt struct btrfs_path *path; 4503d7728c96SJan Schmidt 450482b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4505d7728c96SJan Schmidt return -EPERM; 4506d7728c96SJan Schmidt 4507d7728c96SJan Schmidt path = btrfs_alloc_path(); 4508d7728c96SJan Schmidt if (!path) { 4509d7728c96SJan Schmidt ret = -ENOMEM; 4510d7728c96SJan Schmidt goto out; 4511d7728c96SJan Schmidt } 4512d7728c96SJan Schmidt 4513d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4514d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4515d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4516d7728c96SJan Schmidt ipa = NULL; 4517d7728c96SJan Schmidt goto out; 4518d7728c96SJan Schmidt } 4519d7728c96SJan Schmidt 4520d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4521d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4522d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4523d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4524d7728c96SJan Schmidt ipath = NULL; 4525d7728c96SJan Schmidt goto out; 4526d7728c96SJan Schmidt } 4527d7728c96SJan Schmidt 4528d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4529d7728c96SJan Schmidt if (ret < 0) 4530d7728c96SJan Schmidt goto out; 4531d7728c96SJan Schmidt 4532d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4533745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4534745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4535740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4536d7728c96SJan Schmidt } 4537d7728c96SJan Schmidt 4538718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4539718dc5faSOmar Sandoval ipath->fspath, size); 4540d7728c96SJan Schmidt if (ret) { 4541d7728c96SJan Schmidt ret = -EFAULT; 4542d7728c96SJan Schmidt goto out; 4543d7728c96SJan Schmidt } 4544d7728c96SJan Schmidt 4545d7728c96SJan Schmidt out: 4546d7728c96SJan Schmidt btrfs_free_path(path); 4547d7728c96SJan Schmidt free_ipath(ipath); 4548d7728c96SJan Schmidt kfree(ipa); 4549d7728c96SJan Schmidt 4550d7728c96SJan Schmidt return ret; 4551d7728c96SJan Schmidt } 4552d7728c96SJan Schmidt 4553d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4554d7728c96SJan Schmidt { 4555d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4556d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4557d7728c96SJan Schmidt 4558d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4559d7728c96SJan Schmidt inodes->bytes_left -= c; 4560d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4561d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4562d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4563d7728c96SJan Schmidt inodes->elem_cnt += 3; 4564d7728c96SJan Schmidt } else { 4565d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4566d7728c96SJan Schmidt inodes->bytes_left = 0; 4567d7728c96SJan Schmidt inodes->elem_missed += 3; 4568d7728c96SJan Schmidt } 4569d7728c96SJan Schmidt 4570d7728c96SJan Schmidt return 0; 4571d7728c96SJan Schmidt } 4572d7728c96SJan Schmidt 45732ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4574d24a67b2SZygo Blaxell void __user *arg, int version) 4575d7728c96SJan Schmidt { 4576d7728c96SJan Schmidt int ret = 0; 4577d7728c96SJan Schmidt int size; 4578d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4579d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4580d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4581d24a67b2SZygo Blaxell bool ignore_offset; 4582d7728c96SJan Schmidt 4583d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4584d7728c96SJan Schmidt return -EPERM; 4585d7728c96SJan Schmidt 4586d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 45877b9ea627SShailendra Verma if (IS_ERR(loi)) 45887b9ea627SShailendra Verma return PTR_ERR(loi); 4589d7728c96SJan Schmidt 4590d24a67b2SZygo Blaxell if (version == 1) { 4591d24a67b2SZygo Blaxell ignore_offset = false; 4592b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4593d24a67b2SZygo Blaxell } else { 4594d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4595d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4596d24a67b2SZygo Blaxell ret = -EINVAL; 4597d24a67b2SZygo Blaxell goto out_loi; 4598d24a67b2SZygo Blaxell } 4599d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4600d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4601d24a67b2SZygo Blaxell ret = -EINVAL; 4602d24a67b2SZygo Blaxell goto out_loi; 4603d24a67b2SZygo Blaxell } 4604d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4605b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4606d24a67b2SZygo Blaxell } 4607d24a67b2SZygo Blaxell 4608d7728c96SJan Schmidt path = btrfs_alloc_path(); 4609d7728c96SJan Schmidt if (!path) { 4610d7728c96SJan Schmidt ret = -ENOMEM; 4611d7728c96SJan Schmidt goto out; 4612d7728c96SJan Schmidt } 4613d7728c96SJan Schmidt 4614d7728c96SJan Schmidt inodes = init_data_container(size); 4615d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4616d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4617d7728c96SJan Schmidt inodes = NULL; 4618d7728c96SJan Schmidt goto out; 4619d7728c96SJan Schmidt } 4620d7728c96SJan Schmidt 46212ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4622d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4623df031f07SLiu Bo if (ret == -EINVAL) 4624d7728c96SJan Schmidt ret = -ENOENT; 4625d7728c96SJan Schmidt if (ret < 0) 4626d7728c96SJan Schmidt goto out; 4627d7728c96SJan Schmidt 4628718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4629718dc5faSOmar Sandoval size); 4630d7728c96SJan Schmidt if (ret) 4631d7728c96SJan Schmidt ret = -EFAULT; 4632d7728c96SJan Schmidt 4633d7728c96SJan Schmidt out: 4634d7728c96SJan Schmidt btrfs_free_path(path); 4635f54de068SDavid Sterba kvfree(inodes); 4636d24a67b2SZygo Blaxell out_loi: 4637d7728c96SJan Schmidt kfree(loi); 4638d7728c96SJan Schmidt 4639d7728c96SJan Schmidt return ret; 4640d7728c96SJan Schmidt } 4641d7728c96SJan Schmidt 4642008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4643c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4644c9e9f97bSIlya Dryomov { 4645c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4646c9e9f97bSIlya Dryomov 4647c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4648c9e9f97bSIlya Dryomov 46493009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4650837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4651837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4652837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4653a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4654a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4655837d5b6eSIlya Dryomov 4656c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4657c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4658c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 465919a39dceSIlya Dryomov 466019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 466119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 466219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4663c9e9f97bSIlya Dryomov } 4664c9e9f97bSIlya Dryomov 46659ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4666c9e9f97bSIlya Dryomov { 4667496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4668c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4669c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4670c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4671ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4672c9e9f97bSIlya Dryomov int ret; 4673c9e9f97bSIlya Dryomov 4674c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4675c9e9f97bSIlya Dryomov return -EPERM; 4676c9e9f97bSIlya Dryomov 4677e54bfa31SLiu Bo ret = mnt_want_write_file(file); 46789ba1f6e4SLiu Bo if (ret) 46799ba1f6e4SLiu Bo return ret; 46809ba1f6e4SLiu Bo 4681ed0fb78fSIlya Dryomov again: 4682171938e5SDavid Sterba if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 4683c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4684ed0fb78fSIlya Dryomov need_unlock = true; 4685ed0fb78fSIlya Dryomov goto locked; 4686ed0fb78fSIlya Dryomov } 4687ed0fb78fSIlya Dryomov 4688ed0fb78fSIlya Dryomov /* 468901327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4690ed0fb78fSIlya Dryomov * (1) some other op is running 4691ed0fb78fSIlya Dryomov * (2) balance is running 4692ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4693ed0fb78fSIlya Dryomov */ 4694ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4695ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4696ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 46973009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4698ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4699dccdb07bSDavid Sterba /* 4700dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4701dccdb07bSDavid Sterba * we'll reexamine the status again. 4702dccdb07bSDavid Sterba */ 4703ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4704ed0fb78fSIlya Dryomov 4705ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 47063009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4707ed0fb78fSIlya Dryomov /* this is (3) */ 4708ed0fb78fSIlya Dryomov need_unlock = false; 4709ed0fb78fSIlya Dryomov goto locked; 4710ed0fb78fSIlya Dryomov } 4711ed0fb78fSIlya Dryomov 4712ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4713ed0fb78fSIlya Dryomov goto again; 4714ed0fb78fSIlya Dryomov } else { 4715ed0fb78fSIlya Dryomov /* this is (2) */ 4716ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4717ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4718ed0fb78fSIlya Dryomov goto out; 4719ed0fb78fSIlya Dryomov } 4720ed0fb78fSIlya Dryomov } else { 4721ed0fb78fSIlya Dryomov /* this is (1) */ 4722ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4723e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4724ed0fb78fSIlya Dryomov goto out; 4725ed0fb78fSIlya Dryomov } 4726ed0fb78fSIlya Dryomov 4727ed0fb78fSIlya Dryomov locked: 4728171938e5SDavid Sterba BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); 4729c9e9f97bSIlya Dryomov 4730c9e9f97bSIlya Dryomov if (arg) { 4731c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4732c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4733c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4734ed0fb78fSIlya Dryomov goto out_unlock; 4735c9e9f97bSIlya Dryomov } 4736de322263SIlya Dryomov 4737de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4738de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4739de322263SIlya Dryomov ret = -ENOTCONN; 4740de322263SIlya Dryomov goto out_bargs; 4741de322263SIlya Dryomov } 4742de322263SIlya Dryomov 4743de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4744de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4745de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4746de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4747de322263SIlya Dryomov 4748de322263SIlya Dryomov goto do_balance; 4749de322263SIlya Dryomov } 4750c9e9f97bSIlya Dryomov } else { 4751c9e9f97bSIlya Dryomov bargs = NULL; 4752c9e9f97bSIlya Dryomov } 4753c9e9f97bSIlya Dryomov 4754ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4755837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4756837d5b6eSIlya Dryomov goto out_bargs; 4757837d5b6eSIlya Dryomov } 4758837d5b6eSIlya Dryomov 47598d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4760c9e9f97bSIlya Dryomov if (!bctl) { 4761c9e9f97bSIlya Dryomov ret = -ENOMEM; 4762c9e9f97bSIlya Dryomov goto out_bargs; 4763c9e9f97bSIlya Dryomov } 4764c9e9f97bSIlya Dryomov 4765c9e9f97bSIlya Dryomov if (arg) { 4766c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4767c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4768c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4769c9e9f97bSIlya Dryomov 4770c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4771f43ffb60SIlya Dryomov } else { 4772f43ffb60SIlya Dryomov /* balance everything - no filters */ 4773f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4774c9e9f97bSIlya Dryomov } 4775c9e9f97bSIlya Dryomov 47768eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 47778eb93459SDavid Sterba ret = -EINVAL; 47780f89abf5SChristian Engelmayer goto out_bctl; 47798eb93459SDavid Sterba } 47808eb93459SDavid Sterba 4781de322263SIlya Dryomov do_balance: 4782c9e9f97bSIlya Dryomov /* 4783149196a2SDavid Sterba * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to 4784149196a2SDavid Sterba * btrfs_balance. bctl is freed in reset_balance_state, or, if 4785149196a2SDavid Sterba * restriper was paused all the way until unmount, in free_fs_info. 4786149196a2SDavid Sterba * The flag should be cleared after reset_balance_state. 4787c9e9f97bSIlya Dryomov */ 4788ed0fb78fSIlya Dryomov need_unlock = false; 4789ed0fb78fSIlya Dryomov 47906fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 47910f89abf5SChristian Engelmayer bctl = NULL; 4792ed0fb78fSIlya Dryomov 4793c9e9f97bSIlya Dryomov if (arg) { 4794c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4795c9e9f97bSIlya Dryomov ret = -EFAULT; 4796c9e9f97bSIlya Dryomov } 4797c9e9f97bSIlya Dryomov 47980f89abf5SChristian Engelmayer out_bctl: 47990f89abf5SChristian Engelmayer kfree(bctl); 4800c9e9f97bSIlya Dryomov out_bargs: 4801c9e9f97bSIlya Dryomov kfree(bargs); 4802ed0fb78fSIlya Dryomov out_unlock: 4803c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4804ed0fb78fSIlya Dryomov if (need_unlock) 4805171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 4806ed0fb78fSIlya Dryomov out: 4807e54bfa31SLiu Bo mnt_drop_write_file(file); 4808c9e9f97bSIlya Dryomov return ret; 4809c9e9f97bSIlya Dryomov } 4810c9e9f97bSIlya Dryomov 48112ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4812837d5b6eSIlya Dryomov { 4813837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4814837d5b6eSIlya Dryomov return -EPERM; 4815837d5b6eSIlya Dryomov 4816837d5b6eSIlya Dryomov switch (cmd) { 4817837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 48180b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4819a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 48200b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4821837d5b6eSIlya Dryomov } 4822837d5b6eSIlya Dryomov 4823837d5b6eSIlya Dryomov return -EINVAL; 4824837d5b6eSIlya Dryomov } 4825837d5b6eSIlya Dryomov 48262ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 482719a39dceSIlya Dryomov void __user *arg) 482819a39dceSIlya Dryomov { 482919a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 483019a39dceSIlya Dryomov int ret = 0; 483119a39dceSIlya Dryomov 483219a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 483319a39dceSIlya Dryomov return -EPERM; 483419a39dceSIlya Dryomov 483519a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 483619a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 483719a39dceSIlya Dryomov ret = -ENOTCONN; 483819a39dceSIlya Dryomov goto out; 483919a39dceSIlya Dryomov } 484019a39dceSIlya Dryomov 48418d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 484219a39dceSIlya Dryomov if (!bargs) { 484319a39dceSIlya Dryomov ret = -ENOMEM; 484419a39dceSIlya Dryomov goto out; 484519a39dceSIlya Dryomov } 484619a39dceSIlya Dryomov 4847008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 484819a39dceSIlya Dryomov 484919a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 485019a39dceSIlya Dryomov ret = -EFAULT; 485119a39dceSIlya Dryomov 485219a39dceSIlya Dryomov kfree(bargs); 485319a39dceSIlya Dryomov out: 485419a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 485519a39dceSIlya Dryomov return ret; 485619a39dceSIlya Dryomov } 485719a39dceSIlya Dryomov 4858905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 48595d13a37bSArne Jansen { 48600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48625d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 48635d13a37bSArne Jansen int ret; 48645d13a37bSArne Jansen 48655d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 48665d13a37bSArne Jansen return -EPERM; 48675d13a37bSArne Jansen 4868905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4869905b0ddaSMiao Xie if (ret) 4870905b0ddaSMiao Xie return ret; 48715d13a37bSArne Jansen 48725d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4873905b0ddaSMiao Xie if (IS_ERR(sa)) { 4874905b0ddaSMiao Xie ret = PTR_ERR(sa); 4875905b0ddaSMiao Xie goto drop_write; 4876905b0ddaSMiao Xie } 48775d13a37bSArne Jansen 48780b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 48795d13a37bSArne Jansen 48805d13a37bSArne Jansen switch (sa->cmd) { 48815d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4882340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 48835d13a37bSArne Jansen break; 48845d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4885340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 48865d13a37bSArne Jansen break; 48875d13a37bSArne Jansen default: 48885d13a37bSArne Jansen ret = -EINVAL; 48895d13a37bSArne Jansen break; 48905d13a37bSArne Jansen } 48915d13a37bSArne Jansen 48925d13a37bSArne Jansen kfree(sa); 48930b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4894905b0ddaSMiao Xie drop_write: 4895905b0ddaSMiao Xie mnt_drop_write_file(file); 48965d13a37bSArne Jansen return ret; 48975d13a37bSArne Jansen } 48985d13a37bSArne Jansen 4899905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 49005d13a37bSArne Jansen { 49010b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49030b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 49055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 49065d13a37bSArne Jansen int ret; 49075d13a37bSArne Jansen int err; 49085d13a37bSArne Jansen 49095d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 49105d13a37bSArne Jansen return -EPERM; 49115d13a37bSArne Jansen 4912905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4913905b0ddaSMiao Xie if (ret) 4914905b0ddaSMiao Xie return ret; 49155d13a37bSArne Jansen 49165d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4917905b0ddaSMiao Xie if (IS_ERR(sa)) { 4918905b0ddaSMiao Xie ret = PTR_ERR(sa); 4919905b0ddaSMiao Xie goto drop_write; 4920905b0ddaSMiao Xie } 49215d13a37bSArne Jansen 49225d13a37bSArne Jansen trans = btrfs_join_transaction(root); 49235d13a37bSArne Jansen if (IS_ERR(trans)) { 49245d13a37bSArne Jansen ret = PTR_ERR(trans); 49255d13a37bSArne Jansen goto out; 49265d13a37bSArne Jansen } 49275d13a37bSArne Jansen 49285d13a37bSArne Jansen if (sa->assign) { 49299f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 49305d13a37bSArne Jansen } else { 493139616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 49325d13a37bSArne Jansen } 49335d13a37bSArne Jansen 4934e082f563SQu Wenruo /* update qgroup status and info */ 4935280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4936e082f563SQu Wenruo if (err < 0) 49370b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4938ad8403dfSAnand Jain "failed to update qgroup status and info"); 49393a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 49405d13a37bSArne Jansen if (err && !ret) 49415d13a37bSArne Jansen ret = err; 49425d13a37bSArne Jansen 49435d13a37bSArne Jansen out: 49445d13a37bSArne Jansen kfree(sa); 4945905b0ddaSMiao Xie drop_write: 4946905b0ddaSMiao Xie mnt_drop_write_file(file); 49475d13a37bSArne Jansen return ret; 49485d13a37bSArne Jansen } 49495d13a37bSArne Jansen 4950905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 49515d13a37bSArne Jansen { 49520b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49530b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49545d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 49555d13a37bSArne Jansen struct btrfs_trans_handle *trans; 49565d13a37bSArne Jansen int ret; 49575d13a37bSArne Jansen int err; 49585d13a37bSArne Jansen 49595d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 49605d13a37bSArne Jansen return -EPERM; 49615d13a37bSArne Jansen 4962905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4963905b0ddaSMiao Xie if (ret) 4964905b0ddaSMiao Xie return ret; 49655d13a37bSArne Jansen 49665d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4967905b0ddaSMiao Xie if (IS_ERR(sa)) { 4968905b0ddaSMiao Xie ret = PTR_ERR(sa); 4969905b0ddaSMiao Xie goto drop_write; 4970905b0ddaSMiao Xie } 49715d13a37bSArne Jansen 4972d86e56cfSMiao Xie if (!sa->qgroupid) { 4973d86e56cfSMiao Xie ret = -EINVAL; 4974d86e56cfSMiao Xie goto out; 4975d86e56cfSMiao Xie } 4976d86e56cfSMiao Xie 49775d13a37bSArne Jansen trans = btrfs_join_transaction(root); 49785d13a37bSArne Jansen if (IS_ERR(trans)) { 49795d13a37bSArne Jansen ret = PTR_ERR(trans); 49805d13a37bSArne Jansen goto out; 49815d13a37bSArne Jansen } 49825d13a37bSArne Jansen 49835d13a37bSArne Jansen if (sa->create) { 498449a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 49855d13a37bSArne Jansen } else { 49863efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 49875d13a37bSArne Jansen } 49885d13a37bSArne Jansen 49893a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 49905d13a37bSArne Jansen if (err && !ret) 49915d13a37bSArne Jansen ret = err; 49925d13a37bSArne Jansen 49935d13a37bSArne Jansen out: 49945d13a37bSArne Jansen kfree(sa); 4995905b0ddaSMiao Xie drop_write: 4996905b0ddaSMiao Xie mnt_drop_write_file(file); 49975d13a37bSArne Jansen return ret; 49985d13a37bSArne Jansen } 49995d13a37bSArne Jansen 5000905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 50015d13a37bSArne Jansen { 50020b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50030b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 50045d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 50055d13a37bSArne Jansen struct btrfs_trans_handle *trans; 50065d13a37bSArne Jansen int ret; 50075d13a37bSArne Jansen int err; 50085d13a37bSArne Jansen u64 qgroupid; 50095d13a37bSArne Jansen 50105d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 50115d13a37bSArne Jansen return -EPERM; 50125d13a37bSArne Jansen 5013905b0ddaSMiao Xie ret = mnt_want_write_file(file); 5014905b0ddaSMiao Xie if (ret) 5015905b0ddaSMiao Xie return ret; 50165d13a37bSArne Jansen 50175d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 5018905b0ddaSMiao Xie if (IS_ERR(sa)) { 5019905b0ddaSMiao Xie ret = PTR_ERR(sa); 5020905b0ddaSMiao Xie goto drop_write; 5021905b0ddaSMiao Xie } 50225d13a37bSArne Jansen 50235d13a37bSArne Jansen trans = btrfs_join_transaction(root); 50245d13a37bSArne Jansen if (IS_ERR(trans)) { 50255d13a37bSArne Jansen ret = PTR_ERR(trans); 50265d13a37bSArne Jansen goto out; 50275d13a37bSArne Jansen } 50285d13a37bSArne Jansen 50295d13a37bSArne Jansen qgroupid = sa->qgroupid; 50305d13a37bSArne Jansen if (!qgroupid) { 50315d13a37bSArne Jansen /* take the current subvol as qgroup */ 50325d13a37bSArne Jansen qgroupid = root->root_key.objectid; 50335d13a37bSArne Jansen } 50345d13a37bSArne Jansen 5035f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 50365d13a37bSArne Jansen 50373a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 50385d13a37bSArne Jansen if (err && !ret) 50395d13a37bSArne Jansen ret = err; 50405d13a37bSArne Jansen 50415d13a37bSArne Jansen out: 50425d13a37bSArne Jansen kfree(sa); 5043905b0ddaSMiao Xie drop_write: 5044905b0ddaSMiao Xie mnt_drop_write_file(file); 50455d13a37bSArne Jansen return ret; 50465d13a37bSArne Jansen } 50475d13a37bSArne Jansen 50482f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 50492f232036SJan Schmidt { 50500b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50510b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 50522f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 50532f232036SJan Schmidt int ret; 50542f232036SJan Schmidt 50552f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 50562f232036SJan Schmidt return -EPERM; 50572f232036SJan Schmidt 50582f232036SJan Schmidt ret = mnt_want_write_file(file); 50592f232036SJan Schmidt if (ret) 50602f232036SJan Schmidt return ret; 50612f232036SJan Schmidt 50622f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 50632f232036SJan Schmidt if (IS_ERR(qsa)) { 50642f232036SJan Schmidt ret = PTR_ERR(qsa); 50652f232036SJan Schmidt goto drop_write; 50662f232036SJan Schmidt } 50672f232036SJan Schmidt 50682f232036SJan Schmidt if (qsa->flags) { 50692f232036SJan Schmidt ret = -EINVAL; 50702f232036SJan Schmidt goto out; 50712f232036SJan Schmidt } 50722f232036SJan Schmidt 50730b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 50742f232036SJan Schmidt 50752f232036SJan Schmidt out: 50762f232036SJan Schmidt kfree(qsa); 50772f232036SJan Schmidt drop_write: 50782f232036SJan Schmidt mnt_drop_write_file(file); 50792f232036SJan Schmidt return ret; 50802f232036SJan Schmidt } 50812f232036SJan Schmidt 50822f232036SJan Schmidt static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) 50832f232036SJan Schmidt { 50840b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 50862f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 50872f232036SJan Schmidt int ret = 0; 50882f232036SJan Schmidt 50892f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 50902f232036SJan Schmidt return -EPERM; 50912f232036SJan Schmidt 50928d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 50932f232036SJan Schmidt if (!qsa) 50942f232036SJan Schmidt return -ENOMEM; 50952f232036SJan Schmidt 50960b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 50972f232036SJan Schmidt qsa->flags = 1; 50980b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 50992f232036SJan Schmidt } 51002f232036SJan Schmidt 51012f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 51022f232036SJan Schmidt ret = -EFAULT; 51032f232036SJan Schmidt 51042f232036SJan Schmidt kfree(qsa); 51052f232036SJan Schmidt return ret; 51062f232036SJan Schmidt } 51072f232036SJan Schmidt 510857254b6eSJan Schmidt static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) 510957254b6eSJan Schmidt { 51100b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 511257254b6eSJan Schmidt 511357254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 511457254b6eSJan Schmidt return -EPERM; 511557254b6eSJan Schmidt 51160b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 511757254b6eSJan Schmidt } 511857254b6eSJan Schmidt 5119abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 5120abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 51218ea05e3aSAlexander Block { 5122496ad9aaSAl Viro struct inode *inode = file_inode(file); 51230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51248ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 51258ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 51268ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 512795582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 51288ea05e3aSAlexander Block int ret = 0; 5129dd5f9615SStefan Behrens int received_uuid_changed; 51308ea05e3aSAlexander Block 5131bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 5132bd60ea0fSDavid Sterba return -EPERM; 5133bd60ea0fSDavid Sterba 51348ea05e3aSAlexander Block ret = mnt_want_write_file(file); 51358ea05e3aSAlexander Block if (ret < 0) 51368ea05e3aSAlexander Block return ret; 51378ea05e3aSAlexander Block 51380b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 51398ea05e3aSAlexander Block 51404a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 51418ea05e3aSAlexander Block ret = -EINVAL; 51428ea05e3aSAlexander Block goto out; 51438ea05e3aSAlexander Block } 51448ea05e3aSAlexander Block 51458ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 51468ea05e3aSAlexander Block ret = -EROFS; 51478ea05e3aSAlexander Block goto out; 51488ea05e3aSAlexander Block } 51498ea05e3aSAlexander Block 5150dd5f9615SStefan Behrens /* 5151dd5f9615SStefan Behrens * 1 - root item 5152dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 5153dd5f9615SStefan Behrens */ 5154dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 51558ea05e3aSAlexander Block if (IS_ERR(trans)) { 51568ea05e3aSAlexander Block ret = PTR_ERR(trans); 51578ea05e3aSAlexander Block trans = NULL; 51588ea05e3aSAlexander Block goto out; 51598ea05e3aSAlexander Block } 51608ea05e3aSAlexander Block 51618ea05e3aSAlexander Block sa->rtransid = trans->transid; 51628ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 51638ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 51648ea05e3aSAlexander Block 5165dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 5166dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 5167dd5f9615SStefan Behrens if (received_uuid_changed && 5168d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 5169d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 5170dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5171dd5f9615SStefan Behrens root->root_key.objectid); 5172d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 5173d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 5174d87ff758SNikolay Borisov btrfs_end_transaction(trans); 5175d87ff758SNikolay Borisov goto out; 5176d87ff758SNikolay Borisov } 5177d87ff758SNikolay Borisov } 51788ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 51798ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 51808ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 51813cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 51823cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 51833cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 51843cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 51858ea05e3aSAlexander Block 51860b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 51878ea05e3aSAlexander Block &root->root_key, &root->root_item); 51888ea05e3aSAlexander Block if (ret < 0) { 51893a45bb20SJeff Mahoney btrfs_end_transaction(trans); 51908ea05e3aSAlexander Block goto out; 5191dd5f9615SStefan Behrens } 5192dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 5193cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 5194dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 5195dd5f9615SStefan Behrens root->root_key.objectid); 5196dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 519766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 5198efd38150SNikolay Borisov btrfs_end_transaction(trans); 5199dd5f9615SStefan Behrens goto out; 5200dd5f9615SStefan Behrens } 5201dd5f9615SStefan Behrens } 52023a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5203abccd00fSHugo Mills out: 52040b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 5205abccd00fSHugo Mills mnt_drop_write_file(file); 5206abccd00fSHugo Mills return ret; 5207abccd00fSHugo Mills } 5208abccd00fSHugo Mills 5209abccd00fSHugo Mills #ifdef CONFIG_64BIT 5210abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 5211abccd00fSHugo Mills void __user *arg) 5212abccd00fSHugo Mills { 5213abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 5214abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 5215abccd00fSHugo Mills int ret = 0; 5216abccd00fSHugo Mills 5217abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 52187b9ea627SShailendra Verma if (IS_ERR(args32)) 52197b9ea627SShailendra Verma return PTR_ERR(args32); 5220abccd00fSHugo Mills 52218d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 522284dbeb87SDan Carpenter if (!args64) { 522384dbeb87SDan Carpenter ret = -ENOMEM; 5224abccd00fSHugo Mills goto out; 5225abccd00fSHugo Mills } 5226abccd00fSHugo Mills 5227abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 5228abccd00fSHugo Mills args64->stransid = args32->stransid; 5229abccd00fSHugo Mills args64->rtransid = args32->rtransid; 5230abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 5231abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 5232abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 5233abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 5234abccd00fSHugo Mills args64->flags = args32->flags; 5235abccd00fSHugo Mills 5236abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 5237abccd00fSHugo Mills if (ret) 5238abccd00fSHugo Mills goto out; 5239abccd00fSHugo Mills 5240abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 5241abccd00fSHugo Mills args32->stransid = args64->stransid; 5242abccd00fSHugo Mills args32->rtransid = args64->rtransid; 5243abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 5244abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 5245abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 5246abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 5247abccd00fSHugo Mills args32->flags = args64->flags; 5248abccd00fSHugo Mills 5249abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 5250abccd00fSHugo Mills if (ret) 5251abccd00fSHugo Mills ret = -EFAULT; 5252abccd00fSHugo Mills 5253abccd00fSHugo Mills out: 5254abccd00fSHugo Mills kfree(args32); 5255abccd00fSHugo Mills kfree(args64); 5256abccd00fSHugo Mills return ret; 5257abccd00fSHugo Mills } 5258abccd00fSHugo Mills #endif 5259abccd00fSHugo Mills 5260abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 5261abccd00fSHugo Mills void __user *arg) 5262abccd00fSHugo Mills { 5263abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 5264abccd00fSHugo Mills int ret = 0; 5265abccd00fSHugo Mills 5266abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 52677b9ea627SShailendra Verma if (IS_ERR(sa)) 52687b9ea627SShailendra Verma return PTR_ERR(sa); 5269abccd00fSHugo Mills 5270abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 5271abccd00fSHugo Mills 5272abccd00fSHugo Mills if (ret) 5273abccd00fSHugo Mills goto out; 5274abccd00fSHugo Mills 52758ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 52768ea05e3aSAlexander Block if (ret) 52778ea05e3aSAlexander Block ret = -EFAULT; 52788ea05e3aSAlexander Block 52798ea05e3aSAlexander Block out: 52808ea05e3aSAlexander Block kfree(sa); 52818ea05e3aSAlexander Block return ret; 52828ea05e3aSAlexander Block } 52838ea05e3aSAlexander Block 5284867ab667Sjeff.liu static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) 5285867ab667Sjeff.liu { 52860b246afaSJeff Mahoney struct inode *inode = file_inode(file); 52870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 5288a1b83ac5SAnand Jain size_t len; 5289867ab667Sjeff.liu int ret; 5290a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 5291a1b83ac5SAnand Jain 52920b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 52930b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 52940b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 5295a1b83ac5SAnand Jain 5296a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 5297867ab667Sjeff.liu 5298867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 52990b246afaSJeff Mahoney btrfs_warn(fs_info, 53000b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 53010b246afaSJeff Mahoney --len); 5302867ab667Sjeff.liu } 5303867ab667Sjeff.liu 5304867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 5305867ab667Sjeff.liu 5306867ab667Sjeff.liu return ret ? -EFAULT : 0; 5307867ab667Sjeff.liu } 5308867ab667Sjeff.liu 5309a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 5310a8bfd4abSjeff.liu { 53110b246afaSJeff Mahoney struct inode *inode = file_inode(file); 53120b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 53130b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 53140b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 5315a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5316a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5317a8bfd4abSjeff.liu int ret; 5318a8bfd4abSjeff.liu 5319a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5320a8bfd4abSjeff.liu return -EPERM; 5321a8bfd4abSjeff.liu 5322a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5323a8bfd4abSjeff.liu return -EFAULT; 5324a8bfd4abSjeff.liu 5325a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 53260b246afaSJeff Mahoney btrfs_err(fs_info, 53275d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 5328a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5329a8bfd4abSjeff.liu return -EINVAL; 5330a8bfd4abSjeff.liu } 5331a8bfd4abSjeff.liu 5332a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5333a8bfd4abSjeff.liu if (ret) 5334a8bfd4abSjeff.liu return ret; 5335a8bfd4abSjeff.liu 5336a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5337a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5338a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5339a8bfd4abSjeff.liu goto out_unlock; 5340a8bfd4abSjeff.liu } 5341a8bfd4abSjeff.liu 53420b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 5343a8bfd4abSjeff.liu strcpy(super_block->label, label); 53440b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 53453a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5346a8bfd4abSjeff.liu 5347a8bfd4abSjeff.liu out_unlock: 5348a8bfd4abSjeff.liu mnt_drop_write_file(file); 5349a8bfd4abSjeff.liu return ret; 5350a8bfd4abSjeff.liu } 5351a8bfd4abSjeff.liu 53522eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 53532eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 53542eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 53552eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 53562eaa055fSJeff Mahoney 5357d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 53582eaa055fSJeff Mahoney { 53594d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 53602eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 53612eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 53622eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 53632eaa055fSJeff Mahoney }; 53642eaa055fSJeff Mahoney 53652eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 53662eaa055fSJeff Mahoney return -EFAULT; 53672eaa055fSJeff Mahoney 53682eaa055fSJeff Mahoney return 0; 53692eaa055fSJeff Mahoney } 53702eaa055fSJeff Mahoney 53712eaa055fSJeff Mahoney static int btrfs_ioctl_get_features(struct file *file, void __user *arg) 53722eaa055fSJeff Mahoney { 53730b246afaSJeff Mahoney struct inode *inode = file_inode(file); 53740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 53750b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 53762eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 53772eaa055fSJeff Mahoney 53782eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 53792eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 53802eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 53812eaa055fSJeff Mahoney 53822eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 53832eaa055fSJeff Mahoney return -EFAULT; 53842eaa055fSJeff Mahoney 53852eaa055fSJeff Mahoney return 0; 53862eaa055fSJeff Mahoney } 53872eaa055fSJeff Mahoney 53882ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 53893b02a68aSJeff Mahoney enum btrfs_feature_set set, 53902eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 53912eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 53922eaa055fSJeff Mahoney { 53933b02a68aSJeff Mahoney const char *type = btrfs_feature_set_names[set]; 53943b02a68aSJeff Mahoney char *names; 53952eaa055fSJeff Mahoney u64 disallowed, unsupported; 53962eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 53972eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 53982eaa055fSJeff Mahoney 53992eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 54002eaa055fSJeff Mahoney if (unsupported) { 54013b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 54023b02a68aSJeff Mahoney if (names) { 54030b246afaSJeff Mahoney btrfs_warn(fs_info, 54043b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 54053b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 54063b02a68aSJeff Mahoney kfree(names); 54073b02a68aSJeff Mahoney } else 54080b246afaSJeff Mahoney btrfs_warn(fs_info, 54092eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 54102eaa055fSJeff Mahoney type, unsupported); 54112eaa055fSJeff Mahoney return -EOPNOTSUPP; 54122eaa055fSJeff Mahoney } 54132eaa055fSJeff Mahoney 54142eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 54152eaa055fSJeff Mahoney if (disallowed) { 54163b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 54173b02a68aSJeff Mahoney if (names) { 54180b246afaSJeff Mahoney btrfs_warn(fs_info, 54193b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 54203b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 54213b02a68aSJeff Mahoney kfree(names); 54223b02a68aSJeff Mahoney } else 54230b246afaSJeff Mahoney btrfs_warn(fs_info, 54242eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 54252eaa055fSJeff Mahoney type, disallowed); 54262eaa055fSJeff Mahoney return -EPERM; 54272eaa055fSJeff Mahoney } 54282eaa055fSJeff Mahoney 54292eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 54302eaa055fSJeff Mahoney if (disallowed) { 54313b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 54323b02a68aSJeff Mahoney if (names) { 54330b246afaSJeff Mahoney btrfs_warn(fs_info, 54343b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 54353b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 54363b02a68aSJeff Mahoney kfree(names); 54373b02a68aSJeff Mahoney } else 54380b246afaSJeff Mahoney btrfs_warn(fs_info, 54392eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 54402eaa055fSJeff Mahoney type, disallowed); 54412eaa055fSJeff Mahoney return -EPERM; 54422eaa055fSJeff Mahoney } 54432eaa055fSJeff Mahoney 54442eaa055fSJeff Mahoney return 0; 54452eaa055fSJeff Mahoney } 54462eaa055fSJeff Mahoney 54472ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 54482ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 54492eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 54502eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 54512eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 54522eaa055fSJeff Mahoney 54532eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 54542eaa055fSJeff Mahoney { 54550b246afaSJeff Mahoney struct inode *inode = file_inode(file); 54560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 54570b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 54580b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 54592eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 54602eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 54612eaa055fSJeff Mahoney u64 newflags; 54622eaa055fSJeff Mahoney int ret; 54632eaa055fSJeff Mahoney 54642eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 54652eaa055fSJeff Mahoney return -EPERM; 54662eaa055fSJeff Mahoney 54672eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 54682eaa055fSJeff Mahoney return -EFAULT; 54692eaa055fSJeff Mahoney 54702eaa055fSJeff Mahoney /* Nothing to do */ 54712eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 54722eaa055fSJeff Mahoney !flags[0].incompat_flags) 54732eaa055fSJeff Mahoney return 0; 54742eaa055fSJeff Mahoney 54752ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 54762eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 54772eaa055fSJeff Mahoney if (ret) 54782eaa055fSJeff Mahoney return ret; 54792eaa055fSJeff Mahoney 54802ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 54812eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 54822eaa055fSJeff Mahoney if (ret) 54832eaa055fSJeff Mahoney return ret; 54842eaa055fSJeff Mahoney 54852ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 54862eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 54872eaa055fSJeff Mahoney if (ret) 54882eaa055fSJeff Mahoney return ret; 54892eaa055fSJeff Mahoney 54907ab19625SDavid Sterba ret = mnt_want_write_file(file); 54917ab19625SDavid Sterba if (ret) 54927ab19625SDavid Sterba return ret; 54937ab19625SDavid Sterba 54948051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 54957ab19625SDavid Sterba if (IS_ERR(trans)) { 54967ab19625SDavid Sterba ret = PTR_ERR(trans); 54977ab19625SDavid Sterba goto out_drop_write; 54987ab19625SDavid Sterba } 54992eaa055fSJeff Mahoney 55000b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 55012eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 55022eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 55032eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 55042eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 55052eaa055fSJeff Mahoney 55062eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 55072eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 55082eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 55092eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 55102eaa055fSJeff Mahoney 55112eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 55122eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 55132eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 55142eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 55150b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 55162eaa055fSJeff Mahoney 55173a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 55187ab19625SDavid Sterba out_drop_write: 55197ab19625SDavid Sterba mnt_drop_write_file(file); 55207ab19625SDavid Sterba 55217ab19625SDavid Sterba return ret; 55222eaa055fSJeff Mahoney } 55232eaa055fSJeff Mahoney 55242351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 55252351f431SJosef Bacik { 55262351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 55272351f431SJosef Bacik int ret; 55282351f431SJosef Bacik 55292351f431SJosef Bacik if (compat) { 55302351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55312351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 55322351f431SJosef Bacik 55332351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 55342351f431SJosef Bacik if (ret) 55352351f431SJosef Bacik return -EFAULT; 55362351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 55372351f431SJosef Bacik if (!arg) 55382351f431SJosef Bacik return -ENOMEM; 55392351f431SJosef Bacik arg->send_fd = args32.send_fd; 55402351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 55412351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 55422351f431SJosef Bacik arg->parent_root = args32.parent_root; 55432351f431SJosef Bacik arg->flags = args32.flags; 55442351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 55452351f431SJosef Bacik sizeof(args32.reserved)); 55462351f431SJosef Bacik #else 55472351f431SJosef Bacik return -ENOTTY; 55482351f431SJosef Bacik #endif 55492351f431SJosef Bacik } else { 55502351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 55512351f431SJosef Bacik if (IS_ERR(arg)) 55522351f431SJosef Bacik return PTR_ERR(arg); 55532351f431SJosef Bacik } 55542351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 55552351f431SJosef Bacik kfree(arg); 55562351f431SJosef Bacik return ret; 55572351f431SJosef Bacik } 55582351f431SJosef Bacik 5559f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5560f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5561f46b5a66SChristoph Hellwig { 55620b246afaSJeff Mahoney struct inode *inode = file_inode(file); 55630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 55640b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 55654bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5566f46b5a66SChristoph Hellwig 5567f46b5a66SChristoph Hellwig switch (cmd) { 55686cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 55696cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 55706cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 55716cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 55726cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 55736cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 5574f7039b1dSLi Dongyang case FITRIM: 5575f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 5576f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5577fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5578fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5579fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 55803de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5581fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 55826f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 55836f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 558476dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 558576dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 55860caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 55870caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 55880caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 55890caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 55906ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 55916ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5592f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 55931e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 55941e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 55951e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5596f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5597198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5598f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 55992ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5600f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5601da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 56026b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 56036b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5604475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 56052ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5606475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 56072ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5608f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 56099ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5610ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5611ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5612cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5613cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5614ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5615ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5616d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5617d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5618d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5619d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5620d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5621d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 56221406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 56232ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 56249b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 56259b199859SFilipe David Borba Manana int ret; 56269b199859SFilipe David Borba Manana 562782b3e53bSNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, -1); 56289b199859SFilipe David Borba Manana if (ret) 56299b199859SFilipe David Borba Manana return ret; 56300b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 56312fad4e83SDavid Sterba /* 56322fad4e83SDavid Sterba * The transaction thread may want to do more work, 563301327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 56342fad4e83SDavid Sterba * processing uncleaned subvols. 56352fad4e83SDavid Sterba */ 56360b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 56379b199859SFilipe David Borba Manana return ret; 56389b199859SFilipe David Borba Manana } 563946204592SSage Weil case BTRFS_IOC_START_SYNC: 56409a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 564146204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 56422ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5643475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5644b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5645475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 56462ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5647475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 56482ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5649c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 56509ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5651837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 56522ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 565319a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 56542ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 56558ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 56568ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5657abccd00fSHugo Mills #ifdef CONFIG_64BIT 5658abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5659abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5660abccd00fSHugo Mills #endif 566131db9f7cSAlexander Block case BTRFS_IOC_SEND: 56622351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 56632351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 56642351f431SJosef Bacik case BTRFS_IOC_SEND_32: 56652351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 56662351f431SJosef Bacik #endif 5667c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 56682ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 56695d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5670905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 56715d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5672905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 56735d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5674905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 56755d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5676905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 56772f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 56782f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 56792f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 56802f232036SJan Schmidt return btrfs_ioctl_quota_rescan_status(file, argp); 568157254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 568257254b6eSJan Schmidt return btrfs_ioctl_quota_rescan_wait(file, argp); 56833f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 56842ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 5685867ab667Sjeff.liu case BTRFS_IOC_GET_FSLABEL: 5686867ab667Sjeff.liu return btrfs_ioctl_get_fslabel(file, argp); 5687a8bfd4abSjeff.liu case BTRFS_IOC_SET_FSLABEL: 5688a8bfd4abSjeff.liu return btrfs_ioctl_set_fslabel(file, argp); 56892eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5690d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 56912eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 56922eaa055fSJeff Mahoney return btrfs_ioctl_get_features(file, argp); 56932eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 56942eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5695e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5696e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5697025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5698025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5699b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5700b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 570142e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 570242e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 570323d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 570423d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5705f46b5a66SChristoph Hellwig } 5706f46b5a66SChristoph Hellwig 5707f46b5a66SChristoph Hellwig return -ENOTTY; 5708f46b5a66SChristoph Hellwig } 57094c63c245SLuke Dashjr 57104c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 57114c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 57124c63c245SLuke Dashjr { 57132a362249SJeff Mahoney /* 57142a362249SJeff Mahoney * These all access 32-bit values anyway so no further 57152a362249SJeff Mahoney * handling is necessary. 57162a362249SJeff Mahoney */ 57174c63c245SLuke Dashjr switch (cmd) { 57184c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 57194c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 57204c63c245SLuke Dashjr break; 57214c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 57224c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 57234c63c245SLuke Dashjr break; 57244c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 57254c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 57264c63c245SLuke Dashjr break; 57274c63c245SLuke Dashjr } 57284c63c245SLuke Dashjr 57294c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 57304c63c245SLuke Dashjr } 57314c63c245SLuke Dashjr #endif 5732