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" 31949964c9SMarcos Paulo de Souza #include "export.h" 32f46b5a66SChristoph Hellwig #include "transaction.h" 33f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 34f46b5a66SChristoph Hellwig #include "print-tree.h" 35f46b5a66SChristoph Hellwig #include "volumes.h" 36925baeddSChris Mason #include "locking.h" 37581bb050SLi Zefan #include "inode-map.h" 38d7728c96SJan Schmidt #include "backref.h" 39606686eeSJosef Bacik #include "rcu-string.h" 4031db9f7cSAlexander Block #include "send.h" 413f6bcfbdSStefan Behrens #include "dev-replace.h" 4263541927SFilipe David Borba Manana #include "props.h" 433b02a68aSJeff Mahoney #include "sysfs.h" 44fcebe456SJosef Bacik #include "qgroup.h" 451ec9a1aeSFilipe Manana #include "tree-log.h" 46ebb8765bSAnand Jain #include "compression.h" 478719aaaeSJosef Bacik #include "space-info.h" 4886736342SJosef Bacik #include "delalloc-space.h" 49aac0023cSJosef Bacik #include "block-group.h" 50f46b5a66SChristoph Hellwig 51abccd00fSHugo Mills #ifdef CONFIG_64BIT 52abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 53abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 54abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 55abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 56abccd00fSHugo Mills */ 57abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 58abccd00fSHugo Mills __u64 sec; 59abccd00fSHugo Mills __u32 nsec; 60abccd00fSHugo Mills } __attribute__ ((__packed__)); 61abccd00fSHugo Mills 62abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 63abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 64abccd00fSHugo Mills __u64 stransid; /* in */ 65abccd00fSHugo Mills __u64 rtransid; /* out */ 66abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 67abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 68abccd00fSHugo Mills __u64 flags; /* in */ 69abccd00fSHugo Mills __u64 reserved[16]; /* in */ 70abccd00fSHugo Mills } __attribute__ ((__packed__)); 71abccd00fSHugo Mills 72abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 73abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 74abccd00fSHugo Mills #endif 75abccd00fSHugo Mills 762351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 772351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 782351f431SJosef Bacik __s64 send_fd; /* in */ 792351f431SJosef Bacik __u64 clone_sources_count; /* in */ 802351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 812351f431SJosef Bacik __u64 parent_root; /* in */ 822351f431SJosef Bacik __u64 flags; /* in */ 832351f431SJosef Bacik __u64 reserved[4]; /* in */ 842351f431SJosef Bacik } __attribute__ ((__packed__)); 852351f431SJosef Bacik 862351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 872351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 882351f431SJosef Bacik #endif 89abccd00fSHugo Mills 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; 1905aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 1916cbff00fSChristoph Hellwig int ret; 192ff9fef55SAnand Jain const char *comp = NULL; 193d2b8fcfeSAnand Jain u32 binode_flags = binode->flags; 1946cbff00fSChristoph Hellwig 195bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 196bd60ea0fSDavid Sterba return -EPERM; 197bd60ea0fSDavid Sterba 198b83cc969SLi Zefan if (btrfs_root_readonly(root)) 199b83cc969SLi Zefan return -EROFS; 200b83cc969SLi Zefan 2015c57b8b6SDavid Sterba if (copy_from_user(&fsflags, arg, sizeof(fsflags))) 2026cbff00fSChristoph Hellwig return -EFAULT; 2036cbff00fSChristoph Hellwig 2045c57b8b6SDavid Sterba ret = check_fsflags(fsflags); 20575e7cb7fSLiu Bo if (ret) 20675e7cb7fSLiu Bo return ret; 2076cbff00fSChristoph Hellwig 208e7848683SJan Kara ret = mnt_want_write_file(file); 209e7848683SJan Kara if (ret) 210e7848683SJan Kara return ret; 211e7848683SJan Kara 2125955102cSAl Viro inode_lock(inode); 2136cbff00fSChristoph Hellwig 2145c57b8b6SDavid Sterba fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); 2155aca2842SDarrick J. Wong old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 2165aca2842SDarrick J. Wong ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags); 2175aca2842SDarrick J. Wong if (ret) 2186cbff00fSChristoph Hellwig goto out_unlock; 2196cbff00fSChristoph Hellwig 2205c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 221d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2226cbff00fSChristoph Hellwig else 223d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2245c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 225d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2266cbff00fSChristoph Hellwig else 227d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2285c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 229d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2306cbff00fSChristoph Hellwig else 231d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2325c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 233d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2346cbff00fSChristoph Hellwig else 235d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2365c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 237d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2386cbff00fSChristoph Hellwig else 239d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 2405c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 241d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2426cbff00fSChristoph Hellwig else 243d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2445c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 24544e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2467e97b8daSDavid Sterba /* 2477e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2487e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2497e97b8daSDavid Sterba * status of the file and will not set it. 2507e97b8daSDavid Sterba */ 2517e97b8daSDavid Sterba if (inode->i_size == 0) 252d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 253d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2547e97b8daSDavid Sterba } else { 255d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2567e97b8daSDavid Sterba } 2577e97b8daSDavid Sterba } else { 2587e97b8daSDavid Sterba /* 25901327610SNicholas D Steeves * Revert back under same assumptions as above 2607e97b8daSDavid Sterba */ 26144e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2627e97b8daSDavid Sterba if (inode->i_size == 0) 263d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 264d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2657e97b8daSDavid Sterba } else { 266d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 2677e97b8daSDavid Sterba } 2687e97b8daSDavid Sterba } 2696cbff00fSChristoph Hellwig 27075e7cb7fSLiu Bo /* 27175e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 27275e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 27375e7cb7fSLiu Bo * things smaller. 27475e7cb7fSLiu Bo */ 2755c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 276d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 277d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 2785c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 27963541927SFilipe David Borba Manana 280eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 281eede2bf3SOmar Sandoval ret = -ETXTBSY; 282eede2bf3SOmar Sandoval goto out_unlock; 283eede2bf3SOmar Sandoval } 284eede2bf3SOmar Sandoval 285d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 286d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 28763541927SFilipe David Borba Manana 28893370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 28993370509SDavid Sterba if (!comp || comp[0] == 0) 29093370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 291ebcb904dSLi Zefan } else { 292d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 29375e7cb7fSLiu Bo } 2946cbff00fSChristoph Hellwig 295ff9fef55SAnand Jain /* 296ff9fef55SAnand Jain * 1 for inode item 297ff9fef55SAnand Jain * 2 for properties 298ff9fef55SAnand Jain */ 299ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 300f062abf0SLi Zefan if (IS_ERR(trans)) { 301f062abf0SLi Zefan ret = PTR_ERR(trans); 302d2b8fcfeSAnand Jain goto out_unlock; 303f062abf0SLi Zefan } 3046cbff00fSChristoph Hellwig 305ff9fef55SAnand Jain if (comp) { 306ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 307ff9fef55SAnand Jain strlen(comp), 0); 308ff9fef55SAnand Jain if (ret) { 309ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 310ff9fef55SAnand Jain goto out_end_trans; 311ff9fef55SAnand Jain } 312ff9fef55SAnand Jain } else { 313ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 314ff9fef55SAnand Jain 0, 0); 315ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 316ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 317ff9fef55SAnand Jain goto out_end_trans; 318ff9fef55SAnand Jain } 319ff9fef55SAnand Jain } 320ff9fef55SAnand Jain 321d2b8fcfeSAnand Jain binode->flags = binode_flags; 3227b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3230c4d2d95SJosef Bacik inode_inc_iversion(inode); 324c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3256cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 3266cbff00fSChristoph Hellwig 327ff9fef55SAnand Jain out_end_trans: 3283a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3296cbff00fSChristoph Hellwig out_unlock: 3305955102cSAl Viro inode_unlock(inode); 331e7848683SJan Kara mnt_drop_write_file(file); 3322d4e6f6aSliubo return ret; 3336cbff00fSChristoph Hellwig } 3346cbff00fSChristoph Hellwig 33519f93b3cSDavid Sterba /* 33619f93b3cSDavid Sterba * Translate btrfs internal inode flags to xflags as expected by the 33719f93b3cSDavid Sterba * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are 33819f93b3cSDavid Sterba * silently dropped. 33919f93b3cSDavid Sterba */ 34019f93b3cSDavid Sterba static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) 34119f93b3cSDavid Sterba { 34219f93b3cSDavid Sterba unsigned int xflags = 0; 34319f93b3cSDavid Sterba 34419f93b3cSDavid Sterba if (flags & BTRFS_INODE_APPEND) 34519f93b3cSDavid Sterba xflags |= FS_XFLAG_APPEND; 34619f93b3cSDavid Sterba if (flags & BTRFS_INODE_IMMUTABLE) 34719f93b3cSDavid Sterba xflags |= FS_XFLAG_IMMUTABLE; 34819f93b3cSDavid Sterba if (flags & BTRFS_INODE_NOATIME) 34919f93b3cSDavid Sterba xflags |= FS_XFLAG_NOATIME; 35019f93b3cSDavid Sterba if (flags & BTRFS_INODE_NODUMP) 35119f93b3cSDavid Sterba xflags |= FS_XFLAG_NODUMP; 35219f93b3cSDavid Sterba if (flags & BTRFS_INODE_SYNC) 35319f93b3cSDavid Sterba xflags |= FS_XFLAG_SYNC; 35419f93b3cSDavid Sterba 35519f93b3cSDavid Sterba return xflags; 35619f93b3cSDavid Sterba } 35719f93b3cSDavid Sterba 35819f93b3cSDavid Sterba /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ 35919f93b3cSDavid Sterba static int check_xflags(unsigned int flags) 36019f93b3cSDavid Sterba { 36119f93b3cSDavid Sterba if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | 36219f93b3cSDavid Sterba FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) 36319f93b3cSDavid Sterba return -EOPNOTSUPP; 36419f93b3cSDavid Sterba return 0; 36519f93b3cSDavid Sterba } 36619f93b3cSDavid Sterba 367e4202ac9SDavid Sterba /* 368e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 369e4202ac9SDavid Sterba * are zeroed. 370e4202ac9SDavid Sterba */ 371e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 372e4202ac9SDavid Sterba { 373e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 374e4202ac9SDavid Sterba struct fsxattr fa; 375e4202ac9SDavid Sterba 3767b0e492eSDarrick J. Wong simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags)); 377e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 378e4202ac9SDavid Sterba return -EFAULT; 379e4202ac9SDavid Sterba 380e4202ac9SDavid Sterba return 0; 381e4202ac9SDavid Sterba } 382e4202ac9SDavid Sterba 383025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 384025f2121SDavid Sterba { 385025f2121SDavid Sterba struct inode *inode = file_inode(file); 386025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 387025f2121SDavid Sterba struct btrfs_root *root = binode->root; 388025f2121SDavid Sterba struct btrfs_trans_handle *trans; 3897b0e492eSDarrick J. Wong struct fsxattr fa, old_fa; 390025f2121SDavid Sterba unsigned old_flags; 391025f2121SDavid Sterba unsigned old_i_flags; 392025f2121SDavid Sterba int ret = 0; 393025f2121SDavid Sterba 394025f2121SDavid Sterba if (!inode_owner_or_capable(inode)) 395025f2121SDavid Sterba return -EPERM; 396025f2121SDavid Sterba 397025f2121SDavid Sterba if (btrfs_root_readonly(root)) 398025f2121SDavid Sterba return -EROFS; 399025f2121SDavid Sterba 400025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 401025f2121SDavid Sterba return -EFAULT; 402025f2121SDavid Sterba 403025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 404025f2121SDavid Sterba if (ret) 405025f2121SDavid Sterba return ret; 406025f2121SDavid Sterba 407025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 408025f2121SDavid Sterba return -EOPNOTSUPP; 409025f2121SDavid Sterba 410025f2121SDavid Sterba ret = mnt_want_write_file(file); 411025f2121SDavid Sterba if (ret) 412025f2121SDavid Sterba return ret; 413025f2121SDavid Sterba 414025f2121SDavid Sterba inode_lock(inode); 415025f2121SDavid Sterba 416025f2121SDavid Sterba old_flags = binode->flags; 417025f2121SDavid Sterba old_i_flags = inode->i_flags; 418025f2121SDavid Sterba 4197b0e492eSDarrick J. Wong simple_fill_fsxattr(&old_fa, 4207b0e492eSDarrick J. Wong btrfs_inode_flags_to_xflags(binode->flags)); 4217b0e492eSDarrick J. Wong ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); 4227b0e492eSDarrick J. Wong if (ret) 423025f2121SDavid Sterba goto out_unlock; 424025f2121SDavid Sterba 425025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 426025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 427025f2121SDavid Sterba else 428025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 429025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 430025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 431025f2121SDavid Sterba else 432025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 433025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 434025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 435025f2121SDavid Sterba else 436025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 437025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 438025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 439025f2121SDavid Sterba else 440025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 441025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 442025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 443025f2121SDavid Sterba else 444025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 445025f2121SDavid Sterba 446025f2121SDavid Sterba /* 1 item for the inode */ 447025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 448025f2121SDavid Sterba if (IS_ERR(trans)) { 449025f2121SDavid Sterba ret = PTR_ERR(trans); 450025f2121SDavid Sterba goto out_unlock; 451025f2121SDavid Sterba } 452025f2121SDavid Sterba 453025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 454025f2121SDavid Sterba inode_inc_iversion(inode); 455025f2121SDavid Sterba inode->i_ctime = current_time(inode); 456025f2121SDavid Sterba ret = btrfs_update_inode(trans, root, inode); 457025f2121SDavid Sterba 458025f2121SDavid Sterba btrfs_end_transaction(trans); 459025f2121SDavid Sterba 460025f2121SDavid Sterba out_unlock: 461025f2121SDavid Sterba if (ret) { 462025f2121SDavid Sterba binode->flags = old_flags; 463025f2121SDavid Sterba inode->i_flags = old_i_flags; 464025f2121SDavid Sterba } 465025f2121SDavid Sterba 466025f2121SDavid Sterba inode_unlock(inode); 467025f2121SDavid Sterba mnt_drop_write_file(file); 468025f2121SDavid Sterba 469025f2121SDavid Sterba return ret; 470025f2121SDavid Sterba } 471025f2121SDavid Sterba 4726cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4736cbff00fSChristoph Hellwig { 474496ad9aaSAl Viro struct inode *inode = file_inode(file); 4756cbff00fSChristoph Hellwig 4766cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4776cbff00fSChristoph Hellwig } 478f46b5a66SChristoph Hellwig 479b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 480b929c1d8SMarcos Paulo de Souza void __user *arg) 481f7039b1dSLi Dongyang { 482f7039b1dSLi Dongyang struct btrfs_device *device; 483f7039b1dSLi Dongyang struct request_queue *q; 484f7039b1dSLi Dongyang struct fstrim_range range; 485f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 486f7039b1dSLi Dongyang u64 num_devices = 0; 487f7039b1dSLi Dongyang int ret; 488f7039b1dSLi Dongyang 489f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 490f7039b1dSLi Dongyang return -EPERM; 491f7039b1dSLi Dongyang 492f35f06c3SFilipe Manana /* 493f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 494f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 495f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 496f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 497f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 498f35f06c3SFilipe Manana */ 499f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 500f35f06c3SFilipe Manana return -EROFS; 501f35f06c3SFilipe Manana 5021f78160cSXiao Guangrong rcu_read_lock(); 5031f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5041f78160cSXiao Guangrong dev_list) { 505f7039b1dSLi Dongyang if (!device->bdev) 506f7039b1dSLi Dongyang continue; 507f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 508f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 509f7039b1dSLi Dongyang num_devices++; 51050d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 511f7039b1dSLi Dongyang minlen); 512f7039b1dSLi Dongyang } 513f7039b1dSLi Dongyang } 5141f78160cSXiao Guangrong rcu_read_unlock(); 515f4c697e6SLukas Czerner 516f7039b1dSLi Dongyang if (!num_devices) 517f7039b1dSLi Dongyang return -EOPNOTSUPP; 518f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 519f7039b1dSLi Dongyang return -EFAULT; 5206ba9fc8eSQu Wenruo 5216ba9fc8eSQu Wenruo /* 5226ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5236ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5246ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5256ba9fc8eSQu Wenruo */ 5266ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 527f4c697e6SLukas Czerner return -EINVAL; 528f7039b1dSLi Dongyang 529f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5302ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 531f7039b1dSLi Dongyang if (ret < 0) 532f7039b1dSLi Dongyang return ret; 533f7039b1dSLi Dongyang 534f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 535f7039b1dSLi Dongyang return -EFAULT; 536f7039b1dSLi Dongyang 537f7039b1dSLi Dongyang return 0; 538f7039b1dSLi Dongyang } 539f7039b1dSLi Dongyang 540e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 541dd5f9615SStefan Behrens { 54246e0f66aSChris Mason int i; 54346e0f66aSChris Mason 54446e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54546e0f66aSChris Mason if (uuid[i]) 54646e0f66aSChris Mason return 0; 54746e0f66aSChris Mason } 54846e0f66aSChris Mason return 1; 549dd5f9615SStefan Behrens } 550dd5f9615SStefan Behrens 551d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 552cb8e7090SChristoph Hellwig struct dentry *dentry, 55352f75f4fSDavid Sterba const char *name, int namelen, 5548696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 555f46b5a66SChristoph Hellwig { 5560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 557f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 558f46b5a66SChristoph Hellwig struct btrfs_key key; 55949a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 560f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 561f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 562d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 56376dda93cSYan, Zheng struct btrfs_root *new_root; 564d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 56595582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5665662344bSTsutomu Itoh struct inode *inode; 567f46b5a66SChristoph Hellwig int ret; 568f46b5a66SChristoph Hellwig int err; 5692dfb1e43SQu Wenruo dev_t anon_dev = 0; 570f46b5a66SChristoph Hellwig u64 objectid; 571f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 5723de4586cSChris Mason u64 index = 0; 573f46b5a66SChristoph Hellwig 57449a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 57549a3c4d9SDavid Sterba if (!root_item) 57649a3c4d9SDavid Sterba return -ENOMEM; 57749a3c4d9SDavid Sterba 5780b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 5792fbe8c8aSAl Viro if (ret) 58049a3c4d9SDavid Sterba goto fail_free; 5816a912213SJosef Bacik 5822dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5832dfb1e43SQu Wenruo if (ret < 0) 5842dfb1e43SQu Wenruo goto fail_free; 5852dfb1e43SQu Wenruo 586e09fe2d2SQu Wenruo /* 587e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 58801327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 589e09fe2d2SQu Wenruo */ 59049a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 59149a3c4d9SDavid Sterba ret = -ENOSPC; 59249a3c4d9SDavid Sterba goto fail_free; 59349a3c4d9SDavid Sterba } 594e09fe2d2SQu Wenruo 595d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5969ed74f2dSJosef Bacik /* 597d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 598d5c12070SMiao Xie * of create_snapshot(). 5999ed74f2dSJosef Bacik */ 600c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 601d5c12070SMiao Xie if (ret) 60249a3c4d9SDavid Sterba goto fail_free; 603f46b5a66SChristoph Hellwig 604d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 605d5c12070SMiao Xie if (IS_ERR(trans)) { 606d5c12070SMiao Xie ret = PTR_ERR(trans); 6077775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 60849a3c4d9SDavid Sterba goto fail_free; 609d5c12070SMiao Xie } 610d5c12070SMiao Xie trans->block_rsv = &block_rsv; 611d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 612f46b5a66SChristoph Hellwig 613a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6146f72c7e2SArne Jansen if (ret) 6156f72c7e2SArne Jansen goto fail; 6166f72c7e2SArne Jansen 6174d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 6188e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6198e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6208e8a1e31SJosef Bacik goto fail; 6218e8a1e31SJosef Bacik } 622f46b5a66SChristoph Hellwig 623f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 624f46b5a66SChristoph Hellwig 62549a3c4d9SDavid Sterba inode_item = &root_item->inode; 6263cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6273cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6283cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 629da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6300b246afaSJeff Mahoney fs_info->nodesize); 6313cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 632f46b5a66SChristoph Hellwig 63349a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 63449a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6353cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 63608fe4db1SLi Zefan 63749a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 63849a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 63949a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 64049a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 64149a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 64249a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 643f46b5a66SChristoph Hellwig 64449a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 64549a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 646807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 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; 6682dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 66979787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6702dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 67179787eaaSJeff Mahoney ret = PTR_ERR(new_root); 67266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 67379787eaaSJeff Mahoney goto fail; 67479787eaaSJeff Mahoney } 6752dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6762dfb1e43SQu Wenruo anon_dev = 0; 67776dda93cSYan, Zheng 67876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 67976dda93cSYan, Zheng 68063541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 68100246528SJosef Bacik btrfs_put_root(new_root); 682ce598979SMark Fasheh if (ret) { 683ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 68466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 685ce598979SMark Fasheh goto fail; 686ce598979SMark Fasheh } 687ce598979SMark Fasheh 688f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 689f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 690f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 691f32e48e9SChandan Rajendra 692f46b5a66SChristoph Hellwig /* 693f46b5a66SChristoph Hellwig * insert the directory item 694f46b5a66SChristoph Hellwig */ 695877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 69679787eaaSJeff Mahoney if (ret) { 69766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 69879787eaaSJeff Mahoney goto fail; 69979787eaaSJeff Mahoney } 7003de4586cSChris Mason 701684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7023de4586cSChris Mason BTRFS_FT_DIR, index); 70379787eaaSJeff Mahoney if (ret) { 70466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 705f46b5a66SChristoph Hellwig goto fail; 70679787eaaSJeff Mahoney } 7070660b5afSChris Mason 7086ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 70952c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 710c7e54b51SJosef Bacik if (ret) { 711c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 712c7e54b51SJosef Bacik goto fail; 713c7e54b51SJosef Bacik } 71452c26179SYan Zheng 7156025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7164a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 717c7e54b51SJosef Bacik if (ret) { 718c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 719c7e54b51SJosef Bacik goto fail; 720c7e54b51SJosef Bacik } 7210660b5afSChris Mason 722cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7236bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 724dd5f9615SStefan Behrens if (ret) 72566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 726dd5f9615SStefan Behrens 727f46b5a66SChristoph Hellwig fail: 72849a3c4d9SDavid Sterba kfree(root_item); 729d5c12070SMiao Xie trans->block_rsv = NULL; 730d5c12070SMiao Xie trans->bytes_reserved = 0; 7317775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 732de6e8200SLiu Bo 7333a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 734f46b5a66SChristoph Hellwig if (err && !ret) 735f46b5a66SChristoph Hellwig ret = err; 7361a65e24bSChris Mason 7375662344bSTsutomu Itoh if (!ret) { 7385662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 739de6e8200SLiu Bo if (IS_ERR(inode)) 740de6e8200SLiu Bo return PTR_ERR(inode); 7415662344bSTsutomu Itoh d_instantiate(dentry, inode); 7425662344bSTsutomu Itoh } 743f46b5a66SChristoph Hellwig return ret; 74449a3c4d9SDavid Sterba 74549a3c4d9SDavid Sterba fail_free: 7462dfb1e43SQu Wenruo if (anon_dev) 7472dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 74849a3c4d9SDavid Sterba kfree(root_item); 74949a3c4d9SDavid Sterba return ret; 750f46b5a66SChristoph Hellwig } 751f46b5a66SChristoph Hellwig 752e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7539babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 754e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 755f46b5a66SChristoph Hellwig { 7560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7572e4bfab9SYan, Zheng struct inode *inode; 758f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 759f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7602e4bfab9SYan, Zheng int ret; 761f46b5a66SChristoph Hellwig 76292a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 763f46b5a66SChristoph Hellwig return -EINVAL; 764f46b5a66SChristoph Hellwig 765eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 766eede2bf3SOmar Sandoval btrfs_warn(fs_info, 767eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 768eede2bf3SOmar Sandoval return -ETXTBSY; 769eede2bf3SOmar Sandoval } 770eede2bf3SOmar Sandoval 77123269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 772a1ee7362SDavid Sterba if (!pending_snapshot) 773a1ee7362SDavid Sterba return -ENOMEM; 774a1ee7362SDavid Sterba 7752dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7762dfb1e43SQu Wenruo if (ret < 0) 7772dfb1e43SQu Wenruo goto free_pending; 778b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 77923269bf5SDavid Sterba GFP_KERNEL); 7808546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7818546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 782b0c0ea63SDavid Sterba ret = -ENOMEM; 783b0c0ea63SDavid Sterba goto free_pending; 784b0c0ea63SDavid Sterba } 785b0c0ea63SDavid Sterba 78666d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 78766d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 788d5c12070SMiao Xie /* 789d5c12070SMiao Xie * 1 - parent dir inode 790d5c12070SMiao Xie * 2 - dir entries 791d5c12070SMiao Xie * 1 - root item 792d5c12070SMiao Xie * 2 - root ref/backref 793d5c12070SMiao Xie * 1 - root of snapshot 794dd5f9615SStefan Behrens * 1 - UUID item 795d5c12070SMiao Xie */ 796d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 797dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 798ee3441b4SJeff Mahoney false); 799d5c12070SMiao Xie if (ret) 800c11fbb6eSRobbie Ko goto free_pending; 801d5c12070SMiao Xie 802a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 803a22285a6SYan, Zheng pending_snapshot->root = root; 804b83cc969SLi Zefan pending_snapshot->readonly = readonly; 805e9662f70SMiao Xie pending_snapshot->dir = dir; 8068696c533SMiao Xie pending_snapshot->inherit = inherit; 807a22285a6SYan, Zheng 808d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 809a22285a6SYan, Zheng if (IS_ERR(trans)) { 810a22285a6SYan, Zheng ret = PTR_ERR(trans); 811a22285a6SYan, Zheng goto fail; 812a22285a6SYan, Zheng } 813a22285a6SYan, Zheng 8140b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 815a22285a6SYan, Zheng list_add(&pending_snapshot->list, 816a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8170b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8189babda9fSNikolay Borisov 8193a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 820aec8030aSMiao Xie if (ret) 821c37b2b62SJosef Bacik goto fail; 822a22285a6SYan, Zheng 823a22285a6SYan, Zheng ret = pending_snapshot->error; 824f46b5a66SChristoph Hellwig if (ret) 8252e4bfab9SYan, Zheng goto fail; 826f46b5a66SChristoph Hellwig 827d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 828d3797308SChris Mason if (ret) 829d3797308SChris Mason goto fail; 830d3797308SChris Mason 8312b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8322e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8332e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8342e4bfab9SYan, Zheng goto fail; 8352e4bfab9SYan, Zheng } 8365662344bSTsutomu Itoh 8372e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8382e4bfab9SYan, Zheng ret = 0; 8392dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8402e4bfab9SYan, Zheng fail: 8412dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8422dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8432dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 84400246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 8457775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv); 846b0c0ea63SDavid Sterba free_pending: 8472dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8482dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 849b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8508546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 851a1ee7362SDavid Sterba kfree(pending_snapshot); 852a1ee7362SDavid Sterba 853f46b5a66SChristoph Hellwig return ret; 854f46b5a66SChristoph Hellwig } 855f46b5a66SChristoph Hellwig 8564260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8574260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8584260f7c7SSage Weil * whether the type of victim is right. 8594260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8604260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8614260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8624260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8634260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8644260f7c7SSage Weil * a. be owner of dir, or 8654260f7c7SSage Weil * b. be owner of victim, or 8664260f7c7SSage Weil * c. have CAP_FOWNER capability 86701327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8684260f7c7SSage Weil * links pointing to it. 8694260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8704260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8714260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8724260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8734260f7c7SSage Weil * nfs_async_unlink(). 8744260f7c7SSage Weil */ 8754260f7c7SSage Weil 8764260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8774260f7c7SSage Weil { 8784260f7c7SSage Weil int error; 8794260f7c7SSage Weil 8802b0143b5SDavid Howells if (d_really_is_negative(victim)) 8814260f7c7SSage Weil return -ENOENT; 8824260f7c7SSage Weil 8832b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8844fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8854260f7c7SSage Weil 8864260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 8874260f7c7SSage Weil if (error) 8884260f7c7SSage Weil return error; 8894260f7c7SSage Weil if (IS_APPEND(dir)) 8904260f7c7SSage Weil return -EPERM; 8912b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 8922b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 8934260f7c7SSage Weil return -EPERM; 8944260f7c7SSage Weil if (isdir) { 895e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8964260f7c7SSage Weil return -ENOTDIR; 8974260f7c7SSage Weil if (IS_ROOT(victim)) 8984260f7c7SSage Weil return -EBUSY; 899e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9004260f7c7SSage Weil return -EISDIR; 9014260f7c7SSage Weil if (IS_DEADDIR(dir)) 9024260f7c7SSage Weil return -ENOENT; 9034260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9044260f7c7SSage Weil return -EBUSY; 9054260f7c7SSage Weil return 0; 9064260f7c7SSage Weil } 9074260f7c7SSage Weil 908cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 909cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 910cb8e7090SChristoph Hellwig { 9112b0143b5SDavid Howells if (d_really_is_positive(child)) 912cb8e7090SChristoph Hellwig return -EEXIST; 913cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 914cb8e7090SChristoph Hellwig return -ENOENT; 915cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 916cb8e7090SChristoph Hellwig } 917cb8e7090SChristoph Hellwig 918cb8e7090SChristoph Hellwig /* 919cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 920cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 921cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 922cb8e7090SChristoph Hellwig */ 92392872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 92452f75f4fSDavid Sterba const char *name, int namelen, 92572fd032eSSage Weil struct btrfs_root *snap_src, 9269babda9fSNikolay Borisov bool readonly, 9278696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 928cb8e7090SChristoph Hellwig { 9292b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 931cb8e7090SChristoph Hellwig struct dentry *dentry; 932cb8e7090SChristoph Hellwig int error; 933cb8e7090SChristoph Hellwig 93400235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 93500235411SAl Viro if (error == -EINTR) 93600235411SAl Viro return error; 937cb8e7090SChristoph Hellwig 938cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 939cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 940cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 941cb8e7090SChristoph Hellwig goto out_unlock; 942cb8e7090SChristoph Hellwig 94376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 944cb8e7090SChristoph Hellwig if (error) 945a874a63eSLiu Bo goto out_dput; 946cb8e7090SChristoph Hellwig 9479c52057cSChris Mason /* 9489c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9499c52057cSChris Mason * check for them now when we can safely fail 9509c52057cSChris Mason */ 9519c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9529c52057cSChris Mason dir->i_ino, name, 9539c52057cSChris Mason namelen); 9549c52057cSChris Mason if (error) 9559c52057cSChris Mason goto out_dput; 9569c52057cSChris Mason 9570b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 95876dda93cSYan, Zheng 95976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 96076dda93cSYan, Zheng goto out_up_read; 96176dda93cSYan, Zheng 9629babda9fSNikolay Borisov if (snap_src) 9639babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9649babda9fSNikolay Borisov else 9659babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9669babda9fSNikolay Borisov 96776dda93cSYan, Zheng if (!error) 96876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 96976dda93cSYan, Zheng out_up_read: 9700b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 971cb8e7090SChristoph Hellwig out_dput: 972cb8e7090SChristoph Hellwig dput(dentry); 973cb8e7090SChristoph Hellwig out_unlock: 9745955102cSAl Viro inode_unlock(dir); 975cb8e7090SChristoph Hellwig return error; 976cb8e7090SChristoph Hellwig } 977cb8e7090SChristoph Hellwig 978c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 979c11fbb6eSRobbie Ko const char *name, int namelen, 980c11fbb6eSRobbie Ko struct btrfs_root *root, 981c11fbb6eSRobbie Ko bool readonly, 982c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 983c11fbb6eSRobbie Ko { 984c11fbb6eSRobbie Ko int ret; 985c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 986c11fbb6eSRobbie Ko 987c11fbb6eSRobbie Ko /* 988c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 989c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 990c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 991c11fbb6eSRobbie Ko */ 992c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 993c11fbb6eSRobbie Ko 994c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 995c11fbb6eSRobbie Ko if (ret) 996c11fbb6eSRobbie Ko goto out; 997c11fbb6eSRobbie Ko 998c11fbb6eSRobbie Ko /* 999c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1000c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1001c11fbb6eSRobbie Ko * creation. 1002c11fbb6eSRobbie Ko */ 1003c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1004c11fbb6eSRobbie Ko snapshot_force_cow = true; 1005c11fbb6eSRobbie Ko 1006c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1007c11fbb6eSRobbie Ko 1008c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1009c11fbb6eSRobbie Ko root, readonly, inherit); 1010c11fbb6eSRobbie Ko out: 1011c11fbb6eSRobbie Ko if (snapshot_force_cow) 1012c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1013c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1014c11fbb6eSRobbie Ko return ret; 1015c11fbb6eSRobbie Ko } 1016c11fbb6eSRobbie Ko 10174cb5300bSChris Mason /* 10184cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10194cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10204cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10214cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10224cb5300bSChris Mason * part of the file 10234cb5300bSChris Mason */ 1024aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10254cb5300bSChris Mason { 10264cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10274cb5300bSChris Mason struct extent_map *em = NULL; 10284cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10294cb5300bSChris Mason u64 end; 10304cb5300bSChris Mason 10314cb5300bSChris Mason read_lock(&em_tree->lock); 103209cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10334cb5300bSChris Mason read_unlock(&em_tree->lock); 10344cb5300bSChris Mason 10354cb5300bSChris Mason if (em) { 10364cb5300bSChris Mason end = extent_map_end(em); 10374cb5300bSChris Mason free_extent_map(em); 10384cb5300bSChris Mason if (end - offset > thresh) 10394cb5300bSChris Mason return 0; 10404cb5300bSChris Mason } 10414cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10424cb5300bSChris Mason thresh /= 2; 10434cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10444cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10454cb5300bSChris Mason if (end >= thresh) 10464cb5300bSChris Mason return 0; 10474cb5300bSChris Mason return 1; 10484cb5300bSChris Mason } 10494cb5300bSChris Mason 10504cb5300bSChris Mason /* 10514cb5300bSChris Mason * helper function to walk through a file and find extents 10524cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10534cb5300bSChris Mason * 10544cb5300bSChris Mason * This is used by the defragging code to find new and small 10554cb5300bSChris Mason * extents 10564cb5300bSChris Mason */ 10574cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10584cb5300bSChris Mason struct inode *inode, u64 newer_than, 1059aab110abSDavid Sterba u64 *off, u32 thresh) 10604cb5300bSChris Mason { 10614cb5300bSChris Mason struct btrfs_path *path; 10624cb5300bSChris Mason struct btrfs_key min_key; 10634cb5300bSChris Mason struct extent_buffer *leaf; 10644cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10654cb5300bSChris Mason int type; 10664cb5300bSChris Mason int ret; 10674a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10684cb5300bSChris Mason 10694cb5300bSChris Mason path = btrfs_alloc_path(); 10704cb5300bSChris Mason if (!path) 10714cb5300bSChris Mason return -ENOMEM; 10724cb5300bSChris Mason 1073a4689d2bSDavid Sterba min_key.objectid = ino; 10744cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10754cb5300bSChris Mason min_key.offset = *off; 10764cb5300bSChris Mason 10774cb5300bSChris Mason while (1) { 10786174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10794cb5300bSChris Mason if (ret != 0) 10804cb5300bSChris Mason goto none; 1081f094c9bdSFilipe Manana process_slot: 1082a4689d2bSDavid Sterba if (min_key.objectid != ino) 10834cb5300bSChris Mason goto none; 10844cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10854cb5300bSChris Mason goto none; 10864cb5300bSChris Mason 10874cb5300bSChris Mason leaf = path->nodes[0]; 10884cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10894cb5300bSChris Mason struct btrfs_file_extent_item); 10904cb5300bSChris Mason 10914cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10924cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10934cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10944cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10954cb5300bSChris Mason *off = min_key.offset; 10964cb5300bSChris Mason btrfs_free_path(path); 10974cb5300bSChris Mason return 0; 10984cb5300bSChris Mason } 10994cb5300bSChris Mason 1100f094c9bdSFilipe Manana path->slots[0]++; 1101f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1102f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1103f094c9bdSFilipe Manana goto process_slot; 1104f094c9bdSFilipe Manana } 1105f094c9bdSFilipe Manana 11064cb5300bSChris Mason if (min_key.offset == (u64)-1) 11074cb5300bSChris Mason goto none; 11084cb5300bSChris Mason 11094cb5300bSChris Mason min_key.offset++; 11104cb5300bSChris Mason btrfs_release_path(path); 11114cb5300bSChris Mason } 11124cb5300bSChris Mason none: 11134cb5300bSChris Mason btrfs_free_path(path); 11144cb5300bSChris Mason return -ENOENT; 11154cb5300bSChris Mason } 11164cb5300bSChris Mason 11176c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 111817ce6ef8SLiu Bo { 111917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1120940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11216c282eb4SLi Zefan struct extent_map *em; 112209cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1123940100a4SChris Mason 1124940100a4SChris Mason /* 1125940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1126940100a4SChris Mason * the full extent lock 1127940100a4SChris Mason */ 1128940100a4SChris Mason read_lock(&em_tree->lock); 1129940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1130940100a4SChris Mason read_unlock(&em_tree->lock); 1131940100a4SChris Mason 1132940100a4SChris Mason if (!em) { 1133308d9800SFilipe Manana struct extent_state *cached = NULL; 1134308d9800SFilipe Manana u64 end = start + len - 1; 1135308d9800SFilipe Manana 1136940100a4SChris Mason /* get the big lock and read metadata off disk */ 1137ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 113839b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1139e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1140940100a4SChris Mason 11416cf8bfbfSDan Carpenter if (IS_ERR(em)) 11426c282eb4SLi Zefan return NULL; 1143940100a4SChris Mason } 1144940100a4SChris Mason 11456c282eb4SLi Zefan return em; 11466c282eb4SLi Zefan } 11476c282eb4SLi Zefan 11486c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11496c282eb4SLi Zefan { 11506c282eb4SLi Zefan struct extent_map *next; 11516c282eb4SLi Zefan bool ret = true; 11526c282eb4SLi Zefan 11536c282eb4SLi Zefan /* this is the last extent */ 11546c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11556c282eb4SLi Zefan return false; 11566c282eb4SLi Zefan 11576c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1158e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1159e9512d72SChris Mason ret = false; 1160e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1161ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11626c282eb4SLi Zefan ret = false; 11636c282eb4SLi Zefan 11646c282eb4SLi Zefan free_extent_map(next); 11656c282eb4SLi Zefan return ret; 11666c282eb4SLi Zefan } 11676c282eb4SLi Zefan 1168aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1169a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1170a43a2111SAndrew Mahone int compress) 11716c282eb4SLi Zefan { 11726c282eb4SLi Zefan struct extent_map *em; 11736c282eb4SLi Zefan int ret = 1; 11746c282eb4SLi Zefan bool next_mergeable = true; 11754a3560c4SLiu Bo bool prev_mergeable = true; 11766c282eb4SLi Zefan 11776c282eb4SLi Zefan /* 11786c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11796c282eb4SLi Zefan * defragging it 11806c282eb4SLi Zefan */ 11816c282eb4SLi Zefan if (start < *defrag_end) 11826c282eb4SLi Zefan return 1; 11836c282eb4SLi Zefan 11846c282eb4SLi Zefan *skip = 0; 11856c282eb4SLi Zefan 11866c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11876c282eb4SLi Zefan if (!em) 11886c282eb4SLi Zefan return 0; 11896c282eb4SLi Zefan 1190940100a4SChris Mason /* this will cover holes, and inline extents */ 119117ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1192940100a4SChris Mason ret = 0; 119317ce6ef8SLiu Bo goto out; 119417ce6ef8SLiu Bo } 119517ce6ef8SLiu Bo 11964a3560c4SLiu Bo if (!*defrag_end) 11974a3560c4SLiu Bo prev_mergeable = false; 11984a3560c4SLiu Bo 11996c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1200940100a4SChris Mason /* 12016c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12026c282eb4SLi Zefan * real extent, don't bother defragging it 1203940100a4SChris Mason */ 1204a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12054a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1206940100a4SChris Mason ret = 0; 120717ce6ef8SLiu Bo out: 1208940100a4SChris Mason /* 1209940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1210940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1211940100a4SChris Mason * so that the next tiny extent will force a defrag. 1212940100a4SChris Mason * 1213940100a4SChris Mason * The end result of this is that tiny extents before a single big 1214940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1215940100a4SChris Mason */ 1216940100a4SChris Mason if (ret) { 1217940100a4SChris Mason *defrag_end = extent_map_end(em); 1218940100a4SChris Mason } else { 1219940100a4SChris Mason *last_len = 0; 1220940100a4SChris Mason *skip = extent_map_end(em); 1221940100a4SChris Mason *defrag_end = 0; 1222940100a4SChris Mason } 1223940100a4SChris Mason 1224940100a4SChris Mason free_extent_map(em); 1225940100a4SChris Mason return ret; 1226940100a4SChris Mason } 1227940100a4SChris Mason 12284cb5300bSChris Mason /* 12294cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12304cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12314cb5300bSChris Mason * to COW and defrag. 12324cb5300bSChris Mason * 12334cb5300bSChris Mason * It also makes sure the delalloc code has enough 12344cb5300bSChris Mason * dirty data to avoid making new small extents as part 12354cb5300bSChris Mason * of the defrag 12364cb5300bSChris Mason * 12374cb5300bSChris Mason * It's a good idea to start RA on this range 12384cb5300bSChris Mason * before calling this. 12394cb5300bSChris Mason */ 12404cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12414cb5300bSChris Mason struct page **pages, 12424cb5300bSChris Mason unsigned long start_index, 1243c41570c9SJustin Maggard unsigned long num_pages) 1244f46b5a66SChristoph Hellwig { 12454cb5300bSChris Mason unsigned long file_end; 12464cb5300bSChris Mason u64 isize = i_size_read(inode); 1247f46b5a66SChristoph Hellwig u64 page_start; 1248f46b5a66SChristoph Hellwig u64 page_end; 12491f12bd06SLiu Bo u64 page_cnt; 12504cb5300bSChris Mason int ret; 12514cb5300bSChris Mason int i; 12524cb5300bSChris Mason int i_done; 12534cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12544cb5300bSChris Mason struct extent_state *cached_state = NULL; 1255600a45e1SMiao Xie struct extent_io_tree *tree; 1256364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12573b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12584cb5300bSChris Mason 125909cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12601f12bd06SLiu Bo if (!isize || start_index > file_end) 12611f12bd06SLiu Bo return 0; 12621f12bd06SLiu Bo 12631f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12644cb5300bSChris Mason 1265e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 126609cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 126709cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12684cb5300bSChris Mason if (ret) 12694cb5300bSChris Mason return ret; 12704cb5300bSChris Mason i_done = 0; 1271600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12724cb5300bSChris Mason 12734cb5300bSChris Mason /* step one, lock all the pages */ 12741f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12754cb5300bSChris Mason struct page *page; 1276600a45e1SMiao Xie again: 1277a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12783b16a4e3SJosef Bacik start_index + i, mask); 12794cb5300bSChris Mason if (!page) 12804cb5300bSChris Mason break; 12814cb5300bSChris Mason 1282600a45e1SMiao Xie page_start = page_offset(page); 128309cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1284600a45e1SMiao Xie while (1) { 1285308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1286ff13db41SDavid Sterba &cached_state); 1287c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1288600a45e1SMiao Xie page_start); 1289308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1290e43bbe5eSDavid Sterba &cached_state); 1291600a45e1SMiao Xie if (!ordered) 1292600a45e1SMiao Xie break; 1293600a45e1SMiao Xie 1294600a45e1SMiao Xie unlock_page(page); 1295600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1296600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1297600a45e1SMiao Xie lock_page(page); 12981f12bd06SLiu Bo /* 12991f12bd06SLiu Bo * we unlocked the page above, so we need check if 13001f12bd06SLiu Bo * it was released or not. 13011f12bd06SLiu Bo */ 13021f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13031f12bd06SLiu Bo unlock_page(page); 130409cbfeafSKirill A. Shutemov put_page(page); 13051f12bd06SLiu Bo goto again; 13061f12bd06SLiu Bo } 1307600a45e1SMiao Xie } 1308600a45e1SMiao Xie 13094cb5300bSChris Mason if (!PageUptodate(page)) { 13104cb5300bSChris Mason btrfs_readpage(NULL, page); 13114cb5300bSChris Mason lock_page(page); 13124cb5300bSChris Mason if (!PageUptodate(page)) { 13134cb5300bSChris Mason unlock_page(page); 131409cbfeafSKirill A. Shutemov put_page(page); 13154cb5300bSChris Mason ret = -EIO; 13164cb5300bSChris Mason break; 13174cb5300bSChris Mason } 13184cb5300bSChris Mason } 1319600a45e1SMiao Xie 1320600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1321600a45e1SMiao Xie unlock_page(page); 132209cbfeafSKirill A. Shutemov put_page(page); 1323600a45e1SMiao Xie goto again; 1324600a45e1SMiao Xie } 1325600a45e1SMiao Xie 13264cb5300bSChris Mason pages[i] = page; 13274cb5300bSChris Mason i_done++; 13284cb5300bSChris Mason } 13294cb5300bSChris Mason if (!i_done || ret) 13304cb5300bSChris Mason goto out; 13314cb5300bSChris Mason 13321751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13334cb5300bSChris Mason goto out; 13344cb5300bSChris Mason 13354cb5300bSChris Mason /* 13364cb5300bSChris Mason * so now we have a nice long stream of locked 13374cb5300bSChris Mason * and up to date pages, lets wait on them 13384cb5300bSChris Mason */ 13394cb5300bSChris Mason for (i = 0; i < i_done; i++) 13404cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13414cb5300bSChris Mason 13424cb5300bSChris Mason page_start = page_offset(pages[0]); 134309cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13444cb5300bSChris Mason 13454cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1346ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13474cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1348e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1349e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13504cb5300bSChris Mason 13511f12bd06SLiu Bo if (i_done != page_cnt) { 13529e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 135328c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13549e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 135586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 135609cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 135743b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13584cb5300bSChris Mason } 13594cb5300bSChris Mason 13604cb5300bSChris Mason 13619e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1362018ed4f7SDavid Sterba &cached_state); 13634cb5300bSChris Mason 13644cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1365e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13664cb5300bSChris Mason 13674cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13684cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13694cb5300bSChris Mason ClearPageChecked(pages[i]); 13704cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13714cb5300bSChris Mason set_page_dirty(pages[i]); 13724cb5300bSChris Mason unlock_page(pages[i]); 137309cbfeafSKirill A. Shutemov put_page(pages[i]); 13744cb5300bSChris Mason } 13758702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1376364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13774cb5300bSChris Mason return i_done; 13784cb5300bSChris Mason out: 13794cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13804cb5300bSChris Mason unlock_page(pages[i]); 138109cbfeafSKirill A. Shutemov put_page(pages[i]); 13824cb5300bSChris Mason } 138386d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 138409cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 138543b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 13868702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1387364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13884cb5300bSChris Mason return ret; 13894cb5300bSChris Mason 13904cb5300bSChris Mason } 13914cb5300bSChris Mason 13924cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13934cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13944cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13954cb5300bSChris Mason { 13960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13974cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13984cb5300bSChris Mason struct file_ra_state *ra = NULL; 13994cb5300bSChris Mason unsigned long last_index; 1400151a31b2SLi Zefan u64 isize = i_size_read(inode); 1401940100a4SChris Mason u64 last_len = 0; 1402940100a4SChris Mason u64 skip = 0; 1403940100a4SChris Mason u64 defrag_end = 0; 14044cb5300bSChris Mason u64 newer_off = range->start; 1405f46b5a66SChristoph Hellwig unsigned long i; 1406008873eaSLi Zefan unsigned long ra_index = 0; 1407f46b5a66SChristoph Hellwig int ret; 14084cb5300bSChris Mason int defrag_count = 0; 14091a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1410aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 141109cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1412c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1413ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14144cb5300bSChris Mason struct page **pages = NULL; 14151e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14164cb5300bSChris Mason 14170abd5b17SLiu Bo if (isize == 0) 14180abd5b17SLiu Bo return 0; 14190abd5b17SLiu Bo 14200abd5b17SLiu Bo if (range->start >= isize) 14210abd5b17SLiu Bo return -EINVAL; 14221a419d85SLi Zefan 14231e2ef46dSDavid Sterba if (do_compress) { 1424ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14251a419d85SLi Zefan return -EINVAL; 14261a419d85SLi Zefan if (range->compress_type) 14271a419d85SLi Zefan compress_type = range->compress_type; 14281a419d85SLi Zefan } 1429f46b5a66SChristoph Hellwig 14300abd5b17SLiu Bo if (extent_thresh == 0) 1431ee22184bSByongho Lee extent_thresh = SZ_256K; 1432f46b5a66SChristoph Hellwig 14334cb5300bSChris Mason /* 14340a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14350a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14360a52d108SDavid Sterba * we don't error out. 14374cb5300bSChris Mason */ 14384cb5300bSChris Mason if (!file) { 143963e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14400a52d108SDavid Sterba if (ra) 14414cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14424cb5300bSChris Mason } else { 14434cb5300bSChris Mason ra = &file->f_ra; 14444cb5300bSChris Mason } 14454cb5300bSChris Mason 144663e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14474cb5300bSChris Mason if (!pages) { 14484cb5300bSChris Mason ret = -ENOMEM; 14494cb5300bSChris Mason goto out_ra; 14504cb5300bSChris Mason } 14514cb5300bSChris Mason 14524cb5300bSChris Mason /* find the last page to defrag */ 14531e701a32SChris Mason if (range->start + range->len > range->start) { 1454151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 145509cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14561e701a32SChris Mason } else { 145709cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14581e701a32SChris Mason } 14591e701a32SChris Mason 14604cb5300bSChris Mason if (newer_than) { 14614cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1462ee22184bSByongho Lee &newer_off, SZ_64K); 14634cb5300bSChris Mason if (!ret) { 14644cb5300bSChris Mason range->start = newer_off; 14654cb5300bSChris Mason /* 14664cb5300bSChris Mason * we always align our defrag to help keep 14674cb5300bSChris Mason * the extents in the file evenly spaced 14684cb5300bSChris Mason */ 146909cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14704cb5300bSChris Mason } else 14714cb5300bSChris Mason goto out_ra; 14724cb5300bSChris Mason } else { 147309cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14744cb5300bSChris Mason } 14754cb5300bSChris Mason if (!max_to_defrag) 1476070034bdSchandan max_to_defrag = last_index - i + 1; 14774cb5300bSChris Mason 14782a0f7f57SLi Zefan /* 14792a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14802a0f7f57SLi Zefan * written sequentially. 14812a0f7f57SLi Zefan */ 14822a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14832a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14842a0f7f57SLi Zefan 1485f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 148609cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14874cb5300bSChris Mason /* 14884cb5300bSChris Mason * make sure we stop running if someone unmounts 14894cb5300bSChris Mason * the FS 14904cb5300bSChris Mason */ 14911751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14924cb5300bSChris Mason break; 14934cb5300bSChris Mason 14940b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14950b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1496210549ebSDavid Sterba ret = -EAGAIN; 1497210549ebSDavid Sterba break; 1498210549ebSDavid Sterba } 1499210549ebSDavid Sterba 150009cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15016c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15021e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1503940100a4SChris Mason unsigned long next; 1504940100a4SChris Mason /* 1505940100a4SChris Mason * the should_defrag function tells us how much to skip 1506940100a4SChris Mason * bump our counter by the suggested amount 1507940100a4SChris Mason */ 150809cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1509940100a4SChris Mason i = max(i + 1, next); 1510940100a4SChris Mason continue; 1511940100a4SChris Mason } 1512008873eaSLi Zefan 1513008873eaSLi Zefan if (!newer_than) { 151409cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 151509cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1516008873eaSLi Zefan cluster = min(cluster, max_cluster); 1517008873eaSLi Zefan } else { 1518008873eaSLi Zefan cluster = max_cluster; 1519008873eaSLi Zefan } 1520008873eaSLi Zefan 1521008873eaSLi Zefan if (i + cluster > ra_index) { 1522008873eaSLi Zefan ra_index = max(i, ra_index); 15230a52d108SDavid Sterba if (ra) 1524d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1525d3c0bab5SDavid Sterba file, ra_index, cluster); 1526e4826a5bSchandan ra_index += cluster; 1527008873eaSLi Zefan } 15284cb5300bSChris Mason 15295955102cSAl Viro inode_lock(inode); 1530eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1531eede2bf3SOmar Sandoval ret = -ETXTBSY; 1532eede2bf3SOmar Sandoval } else { 15331e2ef46dSDavid Sterba if (do_compress) 1534eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1535008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1536eede2bf3SOmar Sandoval } 1537ecb8bea8SLiu Bo if (ret < 0) { 15385955102cSAl Viro inode_unlock(inode); 15394cb5300bSChris Mason goto out_ra; 1540ecb8bea8SLiu Bo } 15414cb5300bSChris Mason 15424cb5300bSChris Mason defrag_count += ret; 1543d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15445955102cSAl Viro inode_unlock(inode); 15454cb5300bSChris Mason 15464cb5300bSChris Mason if (newer_than) { 15474cb5300bSChris Mason if (newer_off == (u64)-1) 15484cb5300bSChris Mason break; 15494cb5300bSChris Mason 1550e1f041e1SLiu Bo if (ret > 0) 1551e1f041e1SLiu Bo i += ret; 1552e1f041e1SLiu Bo 15534cb5300bSChris Mason newer_off = max(newer_off + 1, 155409cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15554cb5300bSChris Mason 1556ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1557ee22184bSByongho Lee &newer_off, SZ_64K); 15584cb5300bSChris Mason if (!ret) { 15594cb5300bSChris Mason range->start = newer_off; 156009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15614cb5300bSChris Mason } else { 15624cb5300bSChris Mason break; 1563940100a4SChris Mason } 15644cb5300bSChris Mason } else { 1565008873eaSLi Zefan if (ret > 0) { 1566cbcc8326SLi Zefan i += ret; 156709cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1568008873eaSLi Zefan } else { 1569940100a4SChris Mason i++; 1570008873eaSLi Zefan last_len = 0; 1571008873eaSLi Zefan } 1572f46b5a66SChristoph Hellwig } 15734cb5300bSChris Mason } 1574f46b5a66SChristoph Hellwig 1575dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15761e701a32SChris Mason filemap_flush(inode->i_mapping); 1577dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1578dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1579dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1580dec8ef90SFilipe Manana } 15811e701a32SChris Mason 15821a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15830b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15845c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15855c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15861a419d85SLi Zefan } 15871a419d85SLi Zefan 158860ccf82fSDiego Calleja ret = defrag_count; 1589940100a4SChris Mason 15904cb5300bSChris Mason out_ra: 15911e2ef46dSDavid Sterba if (do_compress) { 15925955102cSAl Viro inode_lock(inode); 1593eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 15945955102cSAl Viro inode_unlock(inode); 1595633085c7SFilipe David Borba Manana } 15964cb5300bSChris Mason if (!file) 15974cb5300bSChris Mason kfree(ra); 15984cb5300bSChris Mason kfree(pages); 1599940100a4SChris Mason return ret; 1600f46b5a66SChristoph Hellwig } 1601f46b5a66SChristoph Hellwig 1602198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 160376dda93cSYan, Zheng void __user *arg) 1604f46b5a66SChristoph Hellwig { 16050b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16060b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1607f46b5a66SChristoph Hellwig u64 new_size; 1608f46b5a66SChristoph Hellwig u64 old_size; 1609f46b5a66SChristoph Hellwig u64 devid = 1; 16100b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1611f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1612f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1613f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1614f46b5a66SChristoph Hellwig char *sizestr; 16159a40f122SGui Hecheng char *retptr; 1616f46b5a66SChristoph Hellwig char *devstr = NULL; 1617f46b5a66SChristoph Hellwig int ret = 0; 1618f46b5a66SChristoph Hellwig int mod = 0; 1619f46b5a66SChristoph Hellwig 1620e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1621e441d54dSChris Mason return -EPERM; 1622e441d54dSChris Mason 1623198605a8SMiao Xie ret = mnt_want_write_file(file); 1624198605a8SMiao Xie if (ret) 1625198605a8SMiao Xie return ret; 1626198605a8SMiao Xie 1627171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 162897547676SMiao Xie mnt_drop_write_file(file); 1629e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1630c9e9f97bSIlya Dryomov } 1631c9e9f97bSIlya Dryomov 1632dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1633c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1634c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1635c9e9f97bSIlya Dryomov goto out; 1636c9e9f97bSIlya Dryomov } 16375516e595SMark Fasheh 16385516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1639f46b5a66SChristoph Hellwig 1640f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1641f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1642f46b5a66SChristoph Hellwig if (devstr) { 1643f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1644f46b5a66SChristoph Hellwig *devstr = '\0'; 1645f46b5a66SChristoph Hellwig devstr = vol_args->name; 164658dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 164758dfae63SZhangZhen if (ret) 164858dfae63SZhangZhen goto out_free; 1649dfd79829SMiao Xie if (!devid) { 1650dfd79829SMiao Xie ret = -EINVAL; 1651dfd79829SMiao Xie goto out_free; 1652dfd79829SMiao Xie } 16530b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1654f46b5a66SChristoph Hellwig } 1655dba60f3fSMiao Xie 165609ba3bc9SAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); 1657f46b5a66SChristoph Hellwig if (!device) { 16580b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1659c1c9ff7cSGeert Uytterhoeven devid); 1660dfd79829SMiao Xie ret = -ENODEV; 1661c9e9f97bSIlya Dryomov goto out_free; 1662f46b5a66SChristoph Hellwig } 1663dba60f3fSMiao Xie 1664ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16650b246afaSJeff Mahoney btrfs_info(fs_info, 1666efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1667c1c9ff7cSGeert Uytterhoeven devid); 1668dfd79829SMiao Xie ret = -EPERM; 16694e42ae1bSLiu Bo goto out_free; 16704e42ae1bSLiu Bo } 16714e42ae1bSLiu Bo 1672f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1673f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1674f46b5a66SChristoph Hellwig else { 1675f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1676f46b5a66SChristoph Hellwig mod = -1; 1677f46b5a66SChristoph Hellwig sizestr++; 1678f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1679f46b5a66SChristoph Hellwig mod = 1; 1680f46b5a66SChristoph Hellwig sizestr++; 1681f46b5a66SChristoph Hellwig } 16829a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16839a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1684f46b5a66SChristoph Hellwig ret = -EINVAL; 1685c9e9f97bSIlya Dryomov goto out_free; 1686f46b5a66SChristoph Hellwig } 1687f46b5a66SChristoph Hellwig } 1688f46b5a66SChristoph Hellwig 1689401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1690dfd79829SMiao Xie ret = -EPERM; 169163a212abSStefan Behrens goto out_free; 169263a212abSStefan Behrens } 169363a212abSStefan Behrens 16947cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1695f46b5a66SChristoph Hellwig 1696f46b5a66SChristoph Hellwig if (mod < 0) { 1697f46b5a66SChristoph Hellwig if (new_size > old_size) { 1698f46b5a66SChristoph Hellwig ret = -EINVAL; 1699c9e9f97bSIlya Dryomov goto out_free; 1700f46b5a66SChristoph Hellwig } 1701f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1702f46b5a66SChristoph Hellwig } else if (mod > 0) { 1703eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1704902c68a4SGui Hecheng ret = -ERANGE; 1705eb8052e0SWenliang Fan goto out_free; 1706eb8052e0SWenliang Fan } 1707f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1708f46b5a66SChristoph Hellwig } 1709f46b5a66SChristoph Hellwig 1710ee22184bSByongho Lee if (new_size < SZ_256M) { 1711f46b5a66SChristoph Hellwig ret = -EINVAL; 1712c9e9f97bSIlya Dryomov goto out_free; 1713f46b5a66SChristoph Hellwig } 1714f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1715f46b5a66SChristoph Hellwig ret = -EFBIG; 1716c9e9f97bSIlya Dryomov goto out_free; 1717f46b5a66SChristoph Hellwig } 1718f46b5a66SChristoph Hellwig 171947f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1720f46b5a66SChristoph Hellwig 1721f46b5a66SChristoph Hellwig if (new_size > old_size) { 1722a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 172398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 172498d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1725c9e9f97bSIlya Dryomov goto out_free; 172698d5dc13STsutomu Itoh } 1727f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17283a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1729ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1730f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17310253f40eSjeff.liu } /* equal, nothing need to do */ 1732f46b5a66SChristoph Hellwig 1733faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1734faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1735faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1736faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1737faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1738c9e9f97bSIlya Dryomov out_free: 1739f46b5a66SChristoph Hellwig kfree(vol_args); 1740c9e9f97bSIlya Dryomov out: 1741171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 174218f39c41SIlya Dryomov mnt_drop_write_file(file); 1743f46b5a66SChristoph Hellwig return ret; 1744f46b5a66SChristoph Hellwig } 1745f46b5a66SChristoph Hellwig 17465d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 174752f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17485d54c67eSNikolay Borisov bool readonly, 17498696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1750f46b5a66SChristoph Hellwig { 1751f46b5a66SChristoph Hellwig int namelen; 17523de4586cSChris Mason int ret = 0; 1753f46b5a66SChristoph Hellwig 1754325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1755325c50e3SJeff Mahoney return -ENOTDIR; 1756325c50e3SJeff Mahoney 1757a874a63eSLiu Bo ret = mnt_want_write_file(file); 1758a874a63eSLiu Bo if (ret) 1759a874a63eSLiu Bo goto out; 1760a874a63eSLiu Bo 176172fd032eSSage Weil namelen = strlen(name); 176272fd032eSSage Weil if (strchr(name, '/')) { 1763f46b5a66SChristoph Hellwig ret = -EINVAL; 1764a874a63eSLiu Bo goto out_drop_write; 1765f46b5a66SChristoph Hellwig } 1766f46b5a66SChristoph Hellwig 176716780cabSChris Mason if (name[0] == '.' && 176816780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 176916780cabSChris Mason ret = -EEXIST; 1770a874a63eSLiu Bo goto out_drop_write; 177116780cabSChris Mason } 177216780cabSChris Mason 17733de4586cSChris Mason if (subvol) { 177472fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17755d54c67eSNikolay Borisov NULL, readonly, inherit); 1776cb8e7090SChristoph Hellwig } else { 17772903ff01SAl Viro struct fd src = fdget(fd); 17783de4586cSChris Mason struct inode *src_inode; 17792903ff01SAl Viro if (!src.file) { 17803de4586cSChris Mason ret = -EINVAL; 1781a874a63eSLiu Bo goto out_drop_write; 17823de4586cSChris Mason } 17833de4586cSChris Mason 1784496ad9aaSAl Viro src_inode = file_inode(src.file); 1785496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1786c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1787efe120a0SFrank Holton "Snapshot src from another FS"); 178823ad5b17SKusanagi Kouichi ret = -EXDEV; 1789d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1790d0242061SDavid Sterba /* 1791d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1792d0242061SDavid Sterba * are limited to own subvolumes only 1793d0242061SDavid Sterba */ 1794d0242061SDavid Sterba ret = -EPERM; 1795ecd18815SAl Viro } else { 1796c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 179772fd032eSSage Weil BTRFS_I(src_inode)->root, 17985d54c67eSNikolay Borisov readonly, inherit); 1799ecd18815SAl Viro } 18002903ff01SAl Viro fdput(src); 1801cb8e7090SChristoph Hellwig } 1802a874a63eSLiu Bo out_drop_write: 1803a874a63eSLiu Bo mnt_drop_write_file(file); 1804f46b5a66SChristoph Hellwig out: 180572fd032eSSage Weil return ret; 180672fd032eSSage Weil } 180772fd032eSSage Weil 180872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1809fa0d2b9bSLi Zefan void __user *arg, int subvol) 181072fd032eSSage Weil { 1811fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 181272fd032eSSage Weil int ret; 181372fd032eSSage Weil 1814325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1815325c50e3SJeff Mahoney return -ENOTDIR; 1816325c50e3SJeff Mahoney 1817fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1818fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1819fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1820fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1821fa0d2b9bSLi Zefan 18225d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18235d54c67eSNikolay Borisov subvol, false, NULL); 1824fa0d2b9bSLi Zefan 1825fa0d2b9bSLi Zefan kfree(vol_args); 1826fa0d2b9bSLi Zefan return ret; 1827fa0d2b9bSLi Zefan } 1828fa0d2b9bSLi Zefan 1829fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1830fa0d2b9bSLi Zefan void __user *arg, int subvol) 1831fa0d2b9bSLi Zefan { 1832fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1833fa0d2b9bSLi Zefan int ret; 1834b83cc969SLi Zefan bool readonly = false; 18356f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 183672fd032eSSage Weil 1837325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1838325c50e3SJeff Mahoney return -ENOTDIR; 1839325c50e3SJeff Mahoney 1840fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1841fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1842fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1843fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1844fdfb1e4fSLi Zefan 1845673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1846b83cc969SLi Zefan ret = -EOPNOTSUPP; 1847c47ca32dSDan Carpenter goto free_args; 1848fdfb1e4fSLi Zefan } 1849fdfb1e4fSLi Zefan 1850b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1851b83cc969SLi Zefan readonly = true; 18526f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 185309cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18546f72c7e2SArne Jansen ret = -EINVAL; 1855c47ca32dSDan Carpenter goto free_args; 18566f72c7e2SArne Jansen } 18576f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18586f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18596f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1860c47ca32dSDan Carpenter goto free_args; 18616f72c7e2SArne Jansen } 18626f72c7e2SArne Jansen } 186375eaa0e2SSage Weil 18645d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18655d54c67eSNikolay Borisov subvol, readonly, inherit); 1866c47ca32dSDan Carpenter if (ret) 1867c47ca32dSDan Carpenter goto free_inherit; 1868c47ca32dSDan Carpenter free_inherit: 18696f72c7e2SArne Jansen kfree(inherit); 1870c47ca32dSDan Carpenter free_args: 1871c47ca32dSDan Carpenter kfree(vol_args); 1872f46b5a66SChristoph Hellwig return ret; 1873f46b5a66SChristoph Hellwig } 1874f46b5a66SChristoph Hellwig 18750caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18760caa102dSLi Zefan void __user *arg) 18770caa102dSLi Zefan { 1878496ad9aaSAl Viro struct inode *inode = file_inode(file); 18790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18800caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18810caa102dSLi Zefan int ret = 0; 18820caa102dSLi Zefan u64 flags = 0; 18830caa102dSLi Zefan 18844a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18850caa102dSLi Zefan return -EINVAL; 18860caa102dSLi Zefan 18870b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 18880caa102dSLi Zefan if (btrfs_root_readonly(root)) 18890caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 18900b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 18910caa102dSLi Zefan 18920caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 18930caa102dSLi Zefan ret = -EFAULT; 18940caa102dSLi Zefan 18950caa102dSLi Zefan return ret; 18960caa102dSLi Zefan } 18970caa102dSLi Zefan 18980caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 18990caa102dSLi Zefan void __user *arg) 19000caa102dSLi Zefan { 1901496ad9aaSAl Viro struct inode *inode = file_inode(file); 19020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19030caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19040caa102dSLi Zefan struct btrfs_trans_handle *trans; 19050caa102dSLi Zefan u64 root_flags; 19060caa102dSLi Zefan u64 flags; 19070caa102dSLi Zefan int ret = 0; 19080caa102dSLi Zefan 1909bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1910bd60ea0fSDavid Sterba return -EPERM; 1911bd60ea0fSDavid Sterba 1912b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1913b9ca0664SLiu Bo if (ret) 1914b9ca0664SLiu Bo goto out; 19150caa102dSLi Zefan 19164a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1917b9ca0664SLiu Bo ret = -EINVAL; 1918b9ca0664SLiu Bo goto out_drop_write; 1919b9ca0664SLiu Bo } 19200caa102dSLi Zefan 1921b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1922b9ca0664SLiu Bo ret = -EFAULT; 1923b9ca0664SLiu Bo goto out_drop_write; 1924b9ca0664SLiu Bo } 19250caa102dSLi Zefan 1926b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1927b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1928b9ca0664SLiu Bo goto out_drop_write; 1929b9ca0664SLiu Bo } 19300caa102dSLi Zefan 19310b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19320caa102dSLi Zefan 19330caa102dSLi Zefan /* nothing to do */ 19340caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1935b9ca0664SLiu Bo goto out_drop_sem; 19360caa102dSLi Zefan 19370caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19382c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19390caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19400caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19412c686537SDavid Sterba } else { 19422c686537SDavid Sterba /* 19432c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19442c686537SDavid Sterba * send 19452c686537SDavid Sterba */ 19462c686537SDavid Sterba spin_lock(&root->root_item_lock); 19472c686537SDavid Sterba if (root->send_in_progress == 0) { 19480caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19490caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19502c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19512c686537SDavid Sterba } else { 19522c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19530b246afaSJeff Mahoney btrfs_warn(fs_info, 19542c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19552c686537SDavid Sterba root->root_key.objectid); 19562c686537SDavid Sterba ret = -EPERM; 19572c686537SDavid Sterba goto out_drop_sem; 19582c686537SDavid Sterba } 19592c686537SDavid Sterba } 19600caa102dSLi Zefan 19610caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19620caa102dSLi Zefan if (IS_ERR(trans)) { 19630caa102dSLi Zefan ret = PTR_ERR(trans); 19640caa102dSLi Zefan goto out_reset; 19650caa102dSLi Zefan } 19660caa102dSLi Zefan 19670b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19680caa102dSLi Zefan &root->root_key, &root->root_item); 19699417ebc8SNikolay Borisov if (ret < 0) { 19709417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19719417ebc8SNikolay Borisov goto out_reset; 19729417ebc8SNikolay Borisov } 19730caa102dSLi Zefan 19749417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19759417ebc8SNikolay Borisov 19760caa102dSLi Zefan out_reset: 19770caa102dSLi Zefan if (ret) 19780caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1979b9ca0664SLiu Bo out_drop_sem: 19800b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1981b9ca0664SLiu Bo out_drop_write: 1982b9ca0664SLiu Bo mnt_drop_write_file(file); 1983b9ca0664SLiu Bo out: 19840caa102dSLi Zefan return ret; 19850caa102dSLi Zefan } 19860caa102dSLi Zefan 1987ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1988ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1989ac8e9819SChris Mason { 1990abc6e134SChris Mason struct btrfs_key test; 1991abc6e134SChris Mason int ret; 1992abc6e134SChris Mason 1993abc6e134SChris Mason test.objectid = sk->min_objectid; 1994abc6e134SChris Mason test.type = sk->min_type; 1995abc6e134SChris Mason test.offset = sk->min_offset; 1996abc6e134SChris Mason 1997abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1998abc6e134SChris Mason if (ret < 0) 1999ac8e9819SChris Mason return 0; 2000abc6e134SChris Mason 2001abc6e134SChris Mason test.objectid = sk->max_objectid; 2002abc6e134SChris Mason test.type = sk->max_type; 2003abc6e134SChris Mason test.offset = sk->max_offset; 2004abc6e134SChris Mason 2005abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2006abc6e134SChris Mason if (ret > 0) 2007ac8e9819SChris Mason return 0; 2008ac8e9819SChris Mason return 1; 2009ac8e9819SChris Mason } 2010ac8e9819SChris Mason 2011df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2012ac8e9819SChris Mason struct btrfs_key *key, 2013ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20149b6e817dSGerhard Heift size_t *buf_size, 2015ba346b35SGerhard Heift char __user *ubuf, 2016ac8e9819SChris Mason unsigned long *sk_offset, 2017ac8e9819SChris Mason int *num_found) 2018ac8e9819SChris Mason { 2019ac8e9819SChris Mason u64 found_transid; 2020ac8e9819SChris Mason struct extent_buffer *leaf; 2021ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2022dd81d459SNaohiro Aota struct btrfs_key test; 2023ac8e9819SChris Mason unsigned long item_off; 2024ac8e9819SChris Mason unsigned long item_len; 2025ac8e9819SChris Mason int nritems; 2026ac8e9819SChris Mason int i; 2027ac8e9819SChris Mason int slot; 2028ac8e9819SChris Mason int ret = 0; 2029ac8e9819SChris Mason 2030ac8e9819SChris Mason leaf = path->nodes[0]; 2031ac8e9819SChris Mason slot = path->slots[0]; 2032ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2033ac8e9819SChris Mason 2034ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2035ac8e9819SChris Mason i = nritems; 2036ac8e9819SChris Mason goto advance_key; 2037ac8e9819SChris Mason } 2038ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2039ac8e9819SChris Mason 2040ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2041ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2042ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2043ac8e9819SChris Mason 204403b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 204503b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 204603b71c6cSGabriel de Perthuis continue; 204703b71c6cSGabriel de Perthuis 20489b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20498f5f6178SGerhard Heift if (*num_found) { 2050ac8e9819SChris Mason ret = 1; 20518f5f6178SGerhard Heift goto out; 20528f5f6178SGerhard Heift } 20538f5f6178SGerhard Heift 20548f5f6178SGerhard Heift /* 20558f5f6178SGerhard Heift * return one empty item back for v1, which does not 20568f5f6178SGerhard Heift * handle -EOVERFLOW 20578f5f6178SGerhard Heift */ 20588f5f6178SGerhard Heift 20599b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2060ac8e9819SChris Mason item_len = 0; 20618f5f6178SGerhard Heift ret = -EOVERFLOW; 20628f5f6178SGerhard Heift } 2063ac8e9819SChris Mason 20649b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2065ac8e9819SChris Mason ret = 1; 206625c9bc2eSGerhard Heift goto out; 2067ac8e9819SChris Mason } 2068ac8e9819SChris Mason 2069ac8e9819SChris Mason sh.objectid = key->objectid; 2070ac8e9819SChris Mason sh.offset = key->offset; 2071ac8e9819SChris Mason sh.type = key->type; 2072ac8e9819SChris Mason sh.len = item_len; 2073ac8e9819SChris Mason sh.transid = found_transid; 2074ac8e9819SChris Mason 2075ac8e9819SChris Mason /* copy search result header */ 2076ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2077ba346b35SGerhard Heift ret = -EFAULT; 2078ba346b35SGerhard Heift goto out; 2079ba346b35SGerhard Heift } 2080ba346b35SGerhard Heift 2081ac8e9819SChris Mason *sk_offset += sizeof(sh); 2082ac8e9819SChris Mason 2083ac8e9819SChris Mason if (item_len) { 2084ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2085ac8e9819SChris Mason /* copy the item */ 2086ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2087ba346b35SGerhard Heift item_off, item_len)) { 2088ba346b35SGerhard Heift ret = -EFAULT; 2089ba346b35SGerhard Heift goto out; 2090ba346b35SGerhard Heift } 2091ba346b35SGerhard Heift 2092ac8e9819SChris Mason *sk_offset += item_len; 2093ac8e9819SChris Mason } 2094e2156867SHugo Mills (*num_found)++; 2095ac8e9819SChris Mason 20968f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20978f5f6178SGerhard Heift goto out; 20988f5f6178SGerhard Heift 209925c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 210025c9bc2eSGerhard Heift ret = 1; 210125c9bc2eSGerhard Heift goto out; 210225c9bc2eSGerhard Heift } 2103ac8e9819SChris Mason } 2104ac8e9819SChris Mason advance_key: 2105ac8e9819SChris Mason ret = 0; 2106dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2107dd81d459SNaohiro Aota test.type = sk->max_type; 2108dd81d459SNaohiro Aota test.offset = sk->max_offset; 2109dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2110dd81d459SNaohiro Aota ret = 1; 2111dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2112abc6e134SChris Mason key->offset++; 2113dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2114abc6e134SChris Mason key->offset = 0; 2115abc6e134SChris Mason key->type++; 2116dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2117abc6e134SChris Mason key->offset = 0; 2118abc6e134SChris Mason key->type = 0; 2119abc6e134SChris Mason key->objectid++; 2120abc6e134SChris Mason } else 2121abc6e134SChris Mason ret = 1; 212225c9bc2eSGerhard Heift out: 2123ba346b35SGerhard Heift /* 2124ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2125ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2126ba346b35SGerhard Heift * * all items were found 2127ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2128ba346b35SGerhard Heift * leaf 2129ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2130ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2131ba346b35SGerhard Heift */ 2132ac8e9819SChris Mason return ret; 2133ac8e9819SChris Mason } 2134ac8e9819SChris Mason 2135ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 213612544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21379b6e817dSGerhard Heift size_t *buf_size, 2138ba346b35SGerhard Heift char __user *ubuf) 2139ac8e9819SChris Mason { 21400b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2141ac8e9819SChris Mason struct btrfs_root *root; 2142ac8e9819SChris Mason struct btrfs_key key; 2143ac8e9819SChris Mason struct btrfs_path *path; 2144ac8e9819SChris Mason int ret; 2145ac8e9819SChris Mason int num_found = 0; 2146ac8e9819SChris Mason unsigned long sk_offset = 0; 2147ac8e9819SChris Mason 21489b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21499b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 215012544442SGerhard Heift return -EOVERFLOW; 21519b6e817dSGerhard Heift } 215212544442SGerhard Heift 2153ac8e9819SChris Mason path = btrfs_alloc_path(); 2154ac8e9819SChris Mason if (!path) 2155ac8e9819SChris Mason return -ENOMEM; 2156ac8e9819SChris Mason 2157ac8e9819SChris Mason if (sk->tree_id == 0) { 2158ac8e9819SChris Mason /* search the root of the inode that was passed */ 215900246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2160ac8e9819SChris Mason } else { 216156e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2162ac8e9819SChris Mason if (IS_ERR(root)) { 2163ac8e9819SChris Mason btrfs_free_path(path); 2164ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2165ac8e9819SChris Mason } 2166ac8e9819SChris Mason } 2167ac8e9819SChris Mason 2168ac8e9819SChris Mason key.objectid = sk->min_objectid; 2169ac8e9819SChris Mason key.type = sk->min_type; 2170ac8e9819SChris Mason key.offset = sk->min_offset; 2171ac8e9819SChris Mason 2172ac8e9819SChris Mason while (1) { 21736174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2174ac8e9819SChris Mason if (ret != 0) { 2175ac8e9819SChris Mason if (ret > 0) 2176ac8e9819SChris Mason ret = 0; 2177ac8e9819SChris Mason goto err; 2178ac8e9819SChris Mason } 2179df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2180ac8e9819SChris Mason &sk_offset, &num_found); 2181b3b4aa74SDavid Sterba btrfs_release_path(path); 218225c9bc2eSGerhard Heift if (ret) 2183ac8e9819SChris Mason break; 2184ac8e9819SChris Mason 2185ac8e9819SChris Mason } 21868f5f6178SGerhard Heift if (ret > 0) 2187ac8e9819SChris Mason ret = 0; 2188ac8e9819SChris Mason err: 2189ac8e9819SChris Mason sk->nr_items = num_found; 219000246528SJosef Bacik btrfs_put_root(root); 2191ac8e9819SChris Mason btrfs_free_path(path); 2192ac8e9819SChris Mason return ret; 2193ac8e9819SChris Mason } 2194ac8e9819SChris Mason 2195ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2196ac8e9819SChris Mason void __user *argp) 2197ac8e9819SChris Mason { 2198ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2199ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2200ac8e9819SChris Mason struct inode *inode; 2201ac8e9819SChris Mason int ret; 22029b6e817dSGerhard Heift size_t buf_size; 2203ac8e9819SChris Mason 2204ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2205ac8e9819SChris Mason return -EPERM; 2206ac8e9819SChris Mason 2207ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2208ac8e9819SChris Mason 2209ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2210ba346b35SGerhard Heift return -EFAULT; 2211ba346b35SGerhard Heift 2212ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2213ac8e9819SChris Mason 2214496ad9aaSAl Viro inode = file_inode(file); 2215ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22168f5f6178SGerhard Heift 22178f5f6178SGerhard Heift /* 22188f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22198f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22208f5f6178SGerhard Heift */ 22218f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22228f5f6178SGerhard Heift ret = 0; 22238f5f6178SGerhard Heift 2224ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2225ac8e9819SChris Mason ret = -EFAULT; 2226ac8e9819SChris Mason return ret; 2227ac8e9819SChris Mason } 2228ac8e9819SChris Mason 2229cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2230cc68a8a5SGerhard Heift void __user *argp) 2231cc68a8a5SGerhard Heift { 2232cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2233cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2234cc68a8a5SGerhard Heift struct inode *inode; 2235cc68a8a5SGerhard Heift int ret; 2236cc68a8a5SGerhard Heift size_t buf_size; 2237ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2238cc68a8a5SGerhard Heift 2239cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2240cc68a8a5SGerhard Heift return -EPERM; 2241cc68a8a5SGerhard Heift 2242cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2243cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2244cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2245cc68a8a5SGerhard Heift return -EFAULT; 2246cc68a8a5SGerhard Heift 2247cc68a8a5SGerhard Heift buf_size = args.buf_size; 2248cc68a8a5SGerhard Heift 2249cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2250cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2251cc68a8a5SGerhard Heift buf_size = buf_limit; 2252cc68a8a5SGerhard Heift 2253cc68a8a5SGerhard Heift inode = file_inode(file); 2254cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2255718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2256cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2257cc68a8a5SGerhard Heift ret = -EFAULT; 2258cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2259cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2260cc68a8a5SGerhard Heift ret = -EFAULT; 2261cc68a8a5SGerhard Heift 226276dda93cSYan, Zheng return ret; 226376dda93cSYan, Zheng } 226476dda93cSYan, Zheng 226598d377a0STARUISI Hiroaki /* 2266ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2267ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 226898d377a0STARUISI Hiroaki */ 226998d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 227098d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 227198d377a0STARUISI Hiroaki { 227298d377a0STARUISI Hiroaki struct btrfs_root *root; 227398d377a0STARUISI Hiroaki struct btrfs_key key; 2274ac8e9819SChris Mason char *ptr; 227598d377a0STARUISI Hiroaki int ret = -1; 227698d377a0STARUISI Hiroaki int slot; 227798d377a0STARUISI Hiroaki int len; 227898d377a0STARUISI Hiroaki int total_len = 0; 227998d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 228098d377a0STARUISI Hiroaki struct extent_buffer *l; 228198d377a0STARUISI Hiroaki struct btrfs_path *path; 228298d377a0STARUISI Hiroaki 228398d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 228498d377a0STARUISI Hiroaki name[0]='\0'; 228598d377a0STARUISI Hiroaki return 0; 228698d377a0STARUISI Hiroaki } 228798d377a0STARUISI Hiroaki 228898d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 228998d377a0STARUISI Hiroaki if (!path) 229098d377a0STARUISI Hiroaki return -ENOMEM; 229198d377a0STARUISI Hiroaki 2292c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 229398d377a0STARUISI Hiroaki 229456e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 229598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2296ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 229788234012SJosef Bacik root = NULL; 229888234012SJosef Bacik goto out; 229988234012SJosef Bacik } 230098d377a0STARUISI Hiroaki 230198d377a0STARUISI Hiroaki key.objectid = dirid; 230298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23038ad6fcabSChris Mason key.offset = (u64)-1; 230498d377a0STARUISI Hiroaki 230598d377a0STARUISI Hiroaki while (1) { 230698d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 230798d377a0STARUISI Hiroaki if (ret < 0) 230898d377a0STARUISI Hiroaki goto out; 230918674c6cSFilipe David Borba Manana else if (ret > 0) { 231018674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 231118674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 231218674c6cSFilipe David Borba Manana if (ret < 0) 231318674c6cSFilipe David Borba Manana goto out; 231418674c6cSFilipe David Borba Manana else if (ret > 0) { 2315ac8e9819SChris Mason ret = -ENOENT; 231698d377a0STARUISI Hiroaki goto out; 2317ac8e9819SChris Mason } 231818674c6cSFilipe David Borba Manana } 231918674c6cSFilipe David Borba Manana 232018674c6cSFilipe David Borba Manana l = path->nodes[0]; 232118674c6cSFilipe David Borba Manana slot = path->slots[0]; 232218674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 232398d377a0STARUISI Hiroaki 232498d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 232598d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 232698d377a0STARUISI Hiroaki ptr -= len + 1; 232798d377a0STARUISI Hiroaki total_len += len + 1; 2328a696cf35SFilipe David Borba Manana if (ptr < name) { 2329a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 233098d377a0STARUISI Hiroaki goto out; 2331a696cf35SFilipe David Borba Manana } 233298d377a0STARUISI Hiroaki 233398d377a0STARUISI Hiroaki *(ptr + len) = '/'; 233498d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 233598d377a0STARUISI Hiroaki 233698d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 233798d377a0STARUISI Hiroaki break; 233898d377a0STARUISI Hiroaki 2339b3b4aa74SDavid Sterba btrfs_release_path(path); 234098d377a0STARUISI Hiroaki key.objectid = key.offset; 23418ad6fcabSChris Mason key.offset = (u64)-1; 234298d377a0STARUISI Hiroaki dirid = key.objectid; 234398d377a0STARUISI Hiroaki } 234477906a50SLi Zefan memmove(name, ptr, total_len); 234598d377a0STARUISI Hiroaki name[total_len] = '\0'; 234698d377a0STARUISI Hiroaki ret = 0; 234798d377a0STARUISI Hiroaki out: 234800246528SJosef Bacik btrfs_put_root(root); 234998d377a0STARUISI Hiroaki btrfs_free_path(path); 2350ac8e9819SChris Mason return ret; 2351ac8e9819SChris Mason } 2352ac8e9819SChris Mason 235323d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 235423d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 235523d0b79dSTomohiro Misono { 235623d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 235723d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 235823d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 235923d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 236023d0b79dSTomohiro Misono u64 dirid = args->dirid; 236123d0b79dSTomohiro Misono unsigned long item_off; 236223d0b79dSTomohiro Misono unsigned long item_len; 236323d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 236423d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2365b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 236623d0b79dSTomohiro Misono struct btrfs_path *path; 236723d0b79dSTomohiro Misono struct btrfs_key key, key2; 236823d0b79dSTomohiro Misono struct extent_buffer *leaf; 236923d0b79dSTomohiro Misono struct inode *temp_inode; 237023d0b79dSTomohiro Misono char *ptr; 237123d0b79dSTomohiro Misono int slot; 237223d0b79dSTomohiro Misono int len; 237323d0b79dSTomohiro Misono int total_len = 0; 237423d0b79dSTomohiro Misono int ret; 237523d0b79dSTomohiro Misono 237623d0b79dSTomohiro Misono path = btrfs_alloc_path(); 237723d0b79dSTomohiro Misono if (!path) 237823d0b79dSTomohiro Misono return -ENOMEM; 237923d0b79dSTomohiro Misono 238023d0b79dSTomohiro Misono /* 238123d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 238223d0b79dSTomohiro Misono * construct the path in from the bottom up. 238323d0b79dSTomohiro Misono */ 238423d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 238523d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 238623d0b79dSTomohiro Misono 238756e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 238823d0b79dSTomohiro Misono if (IS_ERR(root)) { 238923d0b79dSTomohiro Misono ret = PTR_ERR(root); 239023d0b79dSTomohiro Misono goto out; 239123d0b79dSTomohiro Misono } 239223d0b79dSTomohiro Misono 239323d0b79dSTomohiro Misono key.objectid = dirid; 239423d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 239523d0b79dSTomohiro Misono key.offset = (u64)-1; 239623d0b79dSTomohiro Misono while (1) { 239723d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 239823d0b79dSTomohiro Misono if (ret < 0) { 2399b8a49ae1SJosef Bacik goto out_put; 240023d0b79dSTomohiro Misono } else if (ret > 0) { 240123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 240223d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 240323d0b79dSTomohiro Misono if (ret < 0) { 2404b8a49ae1SJosef Bacik goto out_put; 240523d0b79dSTomohiro Misono } else if (ret > 0) { 240623d0b79dSTomohiro Misono ret = -ENOENT; 2407b8a49ae1SJosef Bacik goto out_put; 240823d0b79dSTomohiro Misono } 240923d0b79dSTomohiro Misono } 241023d0b79dSTomohiro Misono 241123d0b79dSTomohiro Misono leaf = path->nodes[0]; 241223d0b79dSTomohiro Misono slot = path->slots[0]; 241323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 241423d0b79dSTomohiro Misono 241523d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 241623d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 241723d0b79dSTomohiro Misono ptr -= len + 1; 241823d0b79dSTomohiro Misono total_len += len + 1; 241923d0b79dSTomohiro Misono if (ptr < args->path) { 242023d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2421b8a49ae1SJosef Bacik goto out_put; 242223d0b79dSTomohiro Misono } 242323d0b79dSTomohiro Misono 242423d0b79dSTomohiro Misono *(ptr + len) = '/'; 242523d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 242623d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 242723d0b79dSTomohiro Misono 242823d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 242923d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 243023d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 243123d0b79dSTomohiro Misono if (ret < 0) { 2432b8a49ae1SJosef Bacik goto out_put; 243323d0b79dSTomohiro Misono } else if (ret > 0) { 243423d0b79dSTomohiro Misono ret = -ENOENT; 2435b8a49ae1SJosef Bacik goto out_put; 243623d0b79dSTomohiro Misono } 243723d0b79dSTomohiro Misono 243823d0b79dSTomohiro Misono leaf = path->nodes[0]; 243923d0b79dSTomohiro Misono slot = path->slots[0]; 244023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 244123d0b79dSTomohiro Misono if (key2.objectid != dirid) { 244223d0b79dSTomohiro Misono ret = -ENOENT; 2443b8a49ae1SJosef Bacik goto out_put; 244423d0b79dSTomohiro Misono } 244523d0b79dSTomohiro Misono 24460202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 24473ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24483ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2449b8a49ae1SJosef Bacik goto out_put; 24503ca57bd6SMisono Tomohiro } 245123d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 245223d0b79dSTomohiro Misono iput(temp_inode); 245323d0b79dSTomohiro Misono if (ret) { 245423d0b79dSTomohiro Misono ret = -EACCES; 2455b8a49ae1SJosef Bacik goto out_put; 245623d0b79dSTomohiro Misono } 245723d0b79dSTomohiro Misono 245823d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 245923d0b79dSTomohiro Misono break; 246023d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 246123d0b79dSTomohiro Misono ret = -EACCES; 2462b8a49ae1SJosef Bacik goto out_put; 246323d0b79dSTomohiro Misono } 246423d0b79dSTomohiro Misono 246523d0b79dSTomohiro Misono btrfs_release_path(path); 246623d0b79dSTomohiro Misono key.objectid = key.offset; 246723d0b79dSTomohiro Misono key.offset = (u64)-1; 246823d0b79dSTomohiro Misono dirid = key.objectid; 246923d0b79dSTomohiro Misono } 247023d0b79dSTomohiro Misono 247123d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 247223d0b79dSTomohiro Misono args->path[total_len] = '\0'; 247300246528SJosef Bacik btrfs_put_root(root); 2474b8a49ae1SJosef Bacik root = NULL; 247523d0b79dSTomohiro Misono btrfs_release_path(path); 247623d0b79dSTomohiro Misono } 247723d0b79dSTomohiro Misono 247823d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 247923d0b79dSTomohiro Misono key.objectid = treeid; 248023d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 248123d0b79dSTomohiro Misono key.offset = args->treeid; 2482b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 248323d0b79dSTomohiro Misono if (ret < 0) { 248423d0b79dSTomohiro Misono goto out; 248523d0b79dSTomohiro Misono } else if (ret > 0) { 248623d0b79dSTomohiro Misono ret = -ENOENT; 248723d0b79dSTomohiro Misono goto out; 248823d0b79dSTomohiro Misono } 248923d0b79dSTomohiro Misono 249023d0b79dSTomohiro Misono leaf = path->nodes[0]; 249123d0b79dSTomohiro Misono slot = path->slots[0]; 249223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 249323d0b79dSTomohiro Misono 249423d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 249523d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 249623d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 249723d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 249823d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 249923d0b79dSTomohiro Misono ret = -EINVAL; 250023d0b79dSTomohiro Misono goto out; 250123d0b79dSTomohiro Misono } 250223d0b79dSTomohiro Misono 250323d0b79dSTomohiro Misono /* Copy subvolume's name */ 250423d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 250523d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 250623d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 250723d0b79dSTomohiro Misono args->name[item_len] = 0; 250823d0b79dSTomohiro Misono 2509b8a49ae1SJosef Bacik out_put: 251000246528SJosef Bacik btrfs_put_root(root); 251123d0b79dSTomohiro Misono out: 251223d0b79dSTomohiro Misono btrfs_free_path(path); 251323d0b79dSTomohiro Misono return ret; 251423d0b79dSTomohiro Misono } 251523d0b79dSTomohiro Misono 2516ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2517ac8e9819SChris Mason void __user *argp) 2518ac8e9819SChris Mason { 2519ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2520ac8e9819SChris Mason struct inode *inode; 252101b810b8SDavid Sterba int ret = 0; 2522ac8e9819SChris Mason 25232354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25242354d08fSJulia Lawall if (IS_ERR(args)) 25252354d08fSJulia Lawall return PTR_ERR(args); 2526c2b96929SDan Carpenter 2527496ad9aaSAl Viro inode = file_inode(file); 2528ac8e9819SChris Mason 252901b810b8SDavid Sterba /* 253001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 253101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 253201b810b8SDavid Sterba */ 25331b53ac4dSChris Mason if (args->treeid == 0) 25341b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25351b53ac4dSChris Mason 253601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 253701b810b8SDavid Sterba args->name[0] = 0; 253801b810b8SDavid Sterba goto out; 253901b810b8SDavid Sterba } 254001b810b8SDavid Sterba 254101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 254201b810b8SDavid Sterba ret = -EPERM; 254301b810b8SDavid Sterba goto out; 254401b810b8SDavid Sterba } 254501b810b8SDavid Sterba 2546ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2547ac8e9819SChris Mason args->treeid, args->objectid, 2548ac8e9819SChris Mason args->name); 2549ac8e9819SChris Mason 255001b810b8SDavid Sterba out: 2551ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2552ac8e9819SChris Mason ret = -EFAULT; 2553ac8e9819SChris Mason 2554ac8e9819SChris Mason kfree(args); 255598d377a0STARUISI Hiroaki return ret; 255698d377a0STARUISI Hiroaki } 255798d377a0STARUISI Hiroaki 255823d0b79dSTomohiro Misono /* 255923d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 256023d0b79dSTomohiro Misono * 256123d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 256223d0b79dSTomohiro Misono * 256323d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 256423d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 256523d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 256623d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 256723d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 256823d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 256923d0b79dSTomohiro Misono */ 257023d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 257123d0b79dSTomohiro Misono { 257223d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 257323d0b79dSTomohiro Misono struct inode *inode; 257423d0b79dSTomohiro Misono int ret; 257523d0b79dSTomohiro Misono 257623d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 257723d0b79dSTomohiro Misono if (IS_ERR(args)) 257823d0b79dSTomohiro Misono return PTR_ERR(args); 257923d0b79dSTomohiro Misono 258023d0b79dSTomohiro Misono inode = file_inode(file); 258123d0b79dSTomohiro Misono 258223d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 258323d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 258423d0b79dSTomohiro Misono /* 258523d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 258623d0b79dSTomohiro Misono * called 258723d0b79dSTomohiro Misono */ 258823d0b79dSTomohiro Misono kfree(args); 258923d0b79dSTomohiro Misono return -EACCES; 259023d0b79dSTomohiro Misono } 259123d0b79dSTomohiro Misono 259223d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 259323d0b79dSTomohiro Misono 259423d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 259523d0b79dSTomohiro Misono ret = -EFAULT; 259623d0b79dSTomohiro Misono 259723d0b79dSTomohiro Misono kfree(args); 259823d0b79dSTomohiro Misono return ret; 259923d0b79dSTomohiro Misono } 260023d0b79dSTomohiro Misono 2601b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2602b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2603b64ec075STomohiro Misono { 2604b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2605b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2606b64ec075STomohiro Misono struct btrfs_root *root; 2607b64ec075STomohiro Misono struct btrfs_path *path; 2608b64ec075STomohiro Misono struct btrfs_key key; 2609b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2610b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2611b64ec075STomohiro Misono struct extent_buffer *leaf; 2612b64ec075STomohiro Misono unsigned long item_off; 2613b64ec075STomohiro Misono unsigned long item_len; 2614b64ec075STomohiro Misono struct inode *inode; 2615b64ec075STomohiro Misono int slot; 2616b64ec075STomohiro Misono int ret = 0; 2617b64ec075STomohiro Misono 2618b64ec075STomohiro Misono path = btrfs_alloc_path(); 2619b64ec075STomohiro Misono if (!path) 2620b64ec075STomohiro Misono return -ENOMEM; 2621b64ec075STomohiro Misono 2622b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2623b64ec075STomohiro Misono if (!subvol_info) { 2624b64ec075STomohiro Misono btrfs_free_path(path); 2625b64ec075STomohiro Misono return -ENOMEM; 2626b64ec075STomohiro Misono } 2627b64ec075STomohiro Misono 2628b64ec075STomohiro Misono inode = file_inode(file); 2629b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2630b64ec075STomohiro Misono 2631b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2632b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 263356e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2634b64ec075STomohiro Misono if (IS_ERR(root)) { 2635b64ec075STomohiro Misono ret = PTR_ERR(root); 263604734e84SJosef Bacik goto out_free; 263704734e84SJosef Bacik } 2638b64ec075STomohiro Misono root_item = &root->root_item; 2639b64ec075STomohiro Misono 2640b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2641b64ec075STomohiro Misono 2642b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2643b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2644b64ec075STomohiro Misono 2645b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2646b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2647b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2648b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2649b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2650b64ec075STomohiro Misono 2651b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2652b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2653b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2654b64ec075STomohiro Misono 2655b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2656b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2657b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2658b64ec075STomohiro Misono 2659b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2660b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2661b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2662b64ec075STomohiro Misono 2663b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2664b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2665b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2666b64ec075STomohiro Misono 2667b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2668b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2669b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2670b64ec075STomohiro Misono key.offset = 0; 267104734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2672b64ec075STomohiro Misono if (ret < 0) { 2673b64ec075STomohiro Misono goto out; 2674b64ec075STomohiro Misono } else if (path->slots[0] >= 2675b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 267604734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2677b64ec075STomohiro Misono if (ret < 0) { 2678b64ec075STomohiro Misono goto out; 2679b64ec075STomohiro Misono } else if (ret > 0) { 2680b64ec075STomohiro Misono ret = -EUCLEAN; 2681b64ec075STomohiro Misono goto out; 2682b64ec075STomohiro Misono } 2683b64ec075STomohiro Misono } 2684b64ec075STomohiro Misono 2685b64ec075STomohiro Misono leaf = path->nodes[0]; 2686b64ec075STomohiro Misono slot = path->slots[0]; 2687b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2688b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2689b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2690b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2691b64ec075STomohiro Misono 2692b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2693b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2694b64ec075STomohiro Misono 2695b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2696b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2697b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2698b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2699b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2700b64ec075STomohiro Misono item_off, item_len); 2701b64ec075STomohiro Misono } else { 2702b64ec075STomohiro Misono ret = -ENOENT; 2703b64ec075STomohiro Misono goto out; 2704b64ec075STomohiro Misono } 2705b64ec075STomohiro Misono } 2706b64ec075STomohiro Misono 2707b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2708b64ec075STomohiro Misono ret = -EFAULT; 2709b64ec075STomohiro Misono 2710b64ec075STomohiro Misono out: 271100246528SJosef Bacik btrfs_put_root(root); 271204734e84SJosef Bacik out_free: 2713b64ec075STomohiro Misono btrfs_free_path(path); 2714b091f7feSWaiman Long kfree(subvol_info); 2715b64ec075STomohiro Misono return ret; 2716b64ec075STomohiro Misono } 2717b64ec075STomohiro Misono 271842e4b520STomohiro Misono /* 271942e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 272042e4b520STomohiro Misono * except the subvolume name. 272142e4b520STomohiro Misono */ 272242e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 272342e4b520STomohiro Misono { 272442e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 272542e4b520STomohiro Misono struct btrfs_root_ref *rref; 272642e4b520STomohiro Misono struct btrfs_root *root; 272742e4b520STomohiro Misono struct btrfs_path *path; 272842e4b520STomohiro Misono struct btrfs_key key; 272942e4b520STomohiro Misono struct extent_buffer *leaf; 273042e4b520STomohiro Misono struct inode *inode; 273142e4b520STomohiro Misono u64 objectid; 273242e4b520STomohiro Misono int slot; 273342e4b520STomohiro Misono int ret; 273442e4b520STomohiro Misono u8 found; 273542e4b520STomohiro Misono 273642e4b520STomohiro Misono path = btrfs_alloc_path(); 273742e4b520STomohiro Misono if (!path) 273842e4b520STomohiro Misono return -ENOMEM; 273942e4b520STomohiro Misono 274042e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 274142e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 274242e4b520STomohiro Misono btrfs_free_path(path); 274342e4b520STomohiro Misono return PTR_ERR(rootrefs); 274442e4b520STomohiro Misono } 274542e4b520STomohiro Misono 274642e4b520STomohiro Misono inode = file_inode(file); 274742e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 274842e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 274942e4b520STomohiro Misono 275042e4b520STomohiro Misono key.objectid = objectid; 275142e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 275242e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 275342e4b520STomohiro Misono found = 0; 275442e4b520STomohiro Misono 275542e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 275642e4b520STomohiro Misono if (ret < 0) { 275742e4b520STomohiro Misono goto out; 275842e4b520STomohiro Misono } else if (path->slots[0] >= 275942e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 276042e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 276142e4b520STomohiro Misono if (ret < 0) { 276242e4b520STomohiro Misono goto out; 276342e4b520STomohiro Misono } else if (ret > 0) { 276442e4b520STomohiro Misono ret = -EUCLEAN; 276542e4b520STomohiro Misono goto out; 276642e4b520STomohiro Misono } 276742e4b520STomohiro Misono } 276842e4b520STomohiro Misono while (1) { 276942e4b520STomohiro Misono leaf = path->nodes[0]; 277042e4b520STomohiro Misono slot = path->slots[0]; 277142e4b520STomohiro Misono 277242e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 277342e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 277442e4b520STomohiro Misono ret = 0; 277542e4b520STomohiro Misono goto out; 277642e4b520STomohiro Misono } 277742e4b520STomohiro Misono 277842e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 277942e4b520STomohiro Misono ret = -EOVERFLOW; 278042e4b520STomohiro Misono goto out; 278142e4b520STomohiro Misono } 278242e4b520STomohiro Misono 278342e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 278442e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 278542e4b520STomohiro Misono rootrefs->rootref[found].dirid = 278642e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 278742e4b520STomohiro Misono found++; 278842e4b520STomohiro Misono 278942e4b520STomohiro Misono ret = btrfs_next_item(root, path); 279042e4b520STomohiro Misono if (ret < 0) { 279142e4b520STomohiro Misono goto out; 279242e4b520STomohiro Misono } else if (ret > 0) { 279342e4b520STomohiro Misono ret = -EUCLEAN; 279442e4b520STomohiro Misono goto out; 279542e4b520STomohiro Misono } 279642e4b520STomohiro Misono } 279742e4b520STomohiro Misono 279842e4b520STomohiro Misono out: 279942e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 280042e4b520STomohiro Misono rootrefs->num_items = found; 280142e4b520STomohiro Misono /* update min_treeid for next search */ 280242e4b520STomohiro Misono if (found) 280342e4b520STomohiro Misono rootrefs->min_treeid = 280442e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 280542e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 280642e4b520STomohiro Misono ret = -EFAULT; 280742e4b520STomohiro Misono } 280842e4b520STomohiro Misono 280942e4b520STomohiro Misono kfree(rootrefs); 281042e4b520STomohiro Misono btrfs_free_path(path); 281142e4b520STomohiro Misono 281242e4b520STomohiro Misono return ret; 281342e4b520STomohiro Misono } 281442e4b520STomohiro Misono 281576dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2816949964c9SMarcos Paulo de Souza void __user *arg, 2817949964c9SMarcos Paulo de Souza bool destroy_v2) 281876dda93cSYan, Zheng { 281954563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28200b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 282176dda93cSYan, Zheng struct dentry *dentry; 28222b0143b5SDavid Howells struct inode *dir = d_inode(parent); 282376dda93cSYan, Zheng struct inode *inode; 282476dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 282576dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2826949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2827949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2828949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2829949964c9SMarcos Paulo de Souza int subvol_namelen; 283076dda93cSYan, Zheng int err = 0; 2831949964c9SMarcos Paulo de Souza bool destroy_parent = false; 283276dda93cSYan, Zheng 2833949964c9SMarcos Paulo de Souza if (destroy_v2) { 2834949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2835949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2836949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2837325c50e3SJeff Mahoney 2838949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2839949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2840949964c9SMarcos Paulo de Souza goto out; 2841949964c9SMarcos Paulo de Souza } 284276dda93cSYan, Zheng 2843949964c9SMarcos Paulo de Souza /* 2844949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2845949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2846949964c9SMarcos Paulo de Souza */ 2847949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2848949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2849949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2850949964c9SMarcos Paulo de Souza 2851949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2852949964c9SMarcos Paulo de Souza if (err) 2853949964c9SMarcos Paulo de Souza goto out; 2854949964c9SMarcos Paulo de Souza } else { 2855949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 285676dda93cSYan, Zheng err = -EINVAL; 285776dda93cSYan, Zheng goto out; 285876dda93cSYan, Zheng } 285976dda93cSYan, Zheng 2860a561be71SAl Viro err = mnt_want_write_file(file); 286176dda93cSYan, Zheng if (err) 286276dda93cSYan, Zheng goto out; 286376dda93cSYan, Zheng 2864949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2865949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2866949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2867949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2868949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2869949964c9SMarcos Paulo de Souza goto out_drop_write; 2870949964c9SMarcos Paulo de Souza } 2871949964c9SMarcos Paulo de Souza 2872949964c9SMarcos Paulo de Souza /* 2873949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2874949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2875949964c9SMarcos Paulo de Souza */ 2876949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2877949964c9SMarcos Paulo de Souza 2878949964c9SMarcos Paulo de Souza /* 2879949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2880949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2881949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2882949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2883949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2884949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2885949964c9SMarcos Paulo de Souza */ 2886949964c9SMarcos Paulo de Souza dput(dentry); 2887949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2888949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2889949964c9SMarcos Paulo de Souza goto out_drop_write; 2890949964c9SMarcos Paulo de Souza } 2891949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2892949964c9SMarcos Paulo de Souza 2893949964c9SMarcos Paulo de Souza /* 2894949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2895949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2896949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2897949964c9SMarcos Paulo de Souza * new parent dentry. 2898949964c9SMarcos Paulo de Souza */ 2899949964c9SMarcos Paulo de Souza destroy_parent = true; 2900949964c9SMarcos Paulo de Souza 2901949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2902949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2903949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2904949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2905949964c9SMarcos Paulo de Souza goto free_parent; 2906949964c9SMarcos Paulo de Souza } 2907949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2908949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2909949964c9SMarcos Paulo de Souza } 2910949964c9SMarcos Paulo de Souza } else { 2911949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2912949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2913949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2914949964c9SMarcos Paulo de Souza 2915949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2916949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2917949964c9SMarcos Paulo de Souza 2918949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2919949964c9SMarcos Paulo de Souza if (err) 2920949964c9SMarcos Paulo de Souza goto out; 2921949964c9SMarcos Paulo de Souza } 2922949964c9SMarcos Paulo de Souza 2923949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2924949964c9SMarcos Paulo de Souza 2925949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2926949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2927949964c9SMarcos Paulo de Souza err = -EINVAL; 2928949964c9SMarcos Paulo de Souza goto free_subvol_name; 2929949964c9SMarcos Paulo de Souza } 2930949964c9SMarcos Paulo de Souza 2931949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2932949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2933949964c9SMarcos Paulo de Souza goto free_subvol_name; 2934949964c9SMarcos Paulo de Souza } 2935521e0546SDavid Sterba 293600235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 293700235411SAl Viro if (err == -EINTR) 2938949964c9SMarcos Paulo de Souza goto free_subvol_name; 2939949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 294076dda93cSYan, Zheng if (IS_ERR(dentry)) { 294176dda93cSYan, Zheng err = PTR_ERR(dentry); 294276dda93cSYan, Zheng goto out_unlock_dir; 294376dda93cSYan, Zheng } 294476dda93cSYan, Zheng 29452b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 294676dda93cSYan, Zheng err = -ENOENT; 294776dda93cSYan, Zheng goto out_dput; 294876dda93cSYan, Zheng } 294976dda93cSYan, Zheng 29502b0143b5SDavid Howells inode = d_inode(dentry); 29514260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29524260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29534260f7c7SSage Weil /* 29544260f7c7SSage Weil * Regular user. Only allow this with a special mount 29554260f7c7SSage Weil * option, when the user has write+exec access to the 29564260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29574260f7c7SSage Weil * allowed. 29584260f7c7SSage Weil * 29594260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29604260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29614260f7c7SSage Weil * otherwise be able to delete. 29624260f7c7SSage Weil * 29634260f7c7SSage Weil * Users who want to delete empty subvols should try 29644260f7c7SSage Weil * rmdir(2). 29654260f7c7SSage Weil */ 29664260f7c7SSage Weil err = -EPERM; 29670b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29684260f7c7SSage Weil goto out_dput; 29694260f7c7SSage Weil 29704260f7c7SSage Weil /* 29714260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 29724260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 29734260f7c7SSage Weil * must be called on the dentry referencing the root 29744260f7c7SSage Weil * of the subvol, not a random directory contained 29754260f7c7SSage Weil * within it. 29764260f7c7SSage Weil */ 29774260f7c7SSage Weil err = -EINVAL; 29784260f7c7SSage Weil if (root == dest) 29794260f7c7SSage Weil goto out_dput; 29804260f7c7SSage Weil 29814260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 29824260f7c7SSage Weil if (err) 29834260f7c7SSage Weil goto out_dput; 29845c39da5bSMiao Xie } 29854260f7c7SSage Weil 29865c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 29874260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 29884260f7c7SSage Weil if (err) 29894260f7c7SSage Weil goto out_dput; 29904260f7c7SSage Weil 29914a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 299276dda93cSYan, Zheng err = -EINVAL; 299376dda93cSYan, Zheng goto out_dput; 299476dda93cSYan, Zheng } 299576dda93cSYan, Zheng 29965955102cSAl Viro inode_lock(inode); 2997f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 29985955102cSAl Viro inode_unlock(inode); 299946008d9dSAmir Goldstein if (!err) { 300046008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 300176dda93cSYan, Zheng d_delete(dentry); 300246008d9dSAmir Goldstein } 3003fa6ac876SLiu Bo 300476dda93cSYan, Zheng out_dput: 300576dda93cSYan, Zheng dput(dentry); 300676dda93cSYan, Zheng out_unlock_dir: 30075955102cSAl Viro inode_unlock(dir); 3008949964c9SMarcos Paulo de Souza free_subvol_name: 3009949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3010949964c9SMarcos Paulo de Souza free_parent: 3011949964c9SMarcos Paulo de Souza if (destroy_parent) 3012949964c9SMarcos Paulo de Souza dput(parent); 301300235411SAl Viro out_drop_write: 30142a79f17eSAl Viro mnt_drop_write_file(file); 301576dda93cSYan, Zheng out: 3016949964c9SMarcos Paulo de Souza kfree(vol_args2); 301776dda93cSYan, Zheng kfree(vol_args); 301876dda93cSYan, Zheng return err; 301976dda93cSYan, Zheng } 302076dda93cSYan, Zheng 30211e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3022f46b5a66SChristoph Hellwig { 3023496ad9aaSAl Viro struct inode *inode = file_inode(file); 3024f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30251e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3026c146afadSYan Zheng int ret; 3027c146afadSYan Zheng 302825122d15SIlya Dryomov ret = mnt_want_write_file(file); 302925122d15SIlya Dryomov if (ret) 303025122d15SIlya Dryomov return ret; 3031b83cc969SLi Zefan 303225122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 303325122d15SIlya Dryomov ret = -EROFS; 303425122d15SIlya Dryomov goto out; 30355ac00addSStefan Behrens } 3036f46b5a66SChristoph Hellwig 3037f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3038f46b5a66SChristoph Hellwig case S_IFDIR: 3039e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3040e441d54dSChris Mason ret = -EPERM; 3041e441d54dSChris Mason goto out; 3042e441d54dSChris Mason } 3043de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3044f46b5a66SChristoph Hellwig break; 3045f46b5a66SChristoph Hellwig case S_IFREG: 3046616d374eSAdam Borowski /* 3047616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3048616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3049616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3050616d374eSAdam Borowski */ 3051616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3052616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3053616d374eSAdam Borowski ret = -EPERM; 3054e441d54dSChris Mason goto out; 3055e441d54dSChris Mason } 30561e701a32SChris Mason 30571e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30581e701a32SChris Mason if (!range) { 30591e701a32SChris Mason ret = -ENOMEM; 30601e701a32SChris Mason goto out; 30611e701a32SChris Mason } 30621e701a32SChris Mason 30631e701a32SChris Mason if (argp) { 30641e701a32SChris Mason if (copy_from_user(range, argp, 30651e701a32SChris Mason sizeof(*range))) { 30661e701a32SChris Mason ret = -EFAULT; 30671e701a32SChris Mason kfree(range); 3068683be16eSDan Carpenter goto out; 30691e701a32SChris Mason } 30701e701a32SChris Mason /* compression requires us to start the IO */ 30711e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 30721e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 30731e701a32SChris Mason range->extent_thresh = (u32)-1; 30741e701a32SChris Mason } 30751e701a32SChris Mason } else { 30761e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 30771e701a32SChris Mason range->len = (u64)-1; 30781e701a32SChris Mason } 3079496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 30807c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 30814cb5300bSChris Mason if (ret > 0) 30824cb5300bSChris Mason ret = 0; 30831e701a32SChris Mason kfree(range); 3084f46b5a66SChristoph Hellwig break; 30858929ecfaSYan, Zheng default: 30868929ecfaSYan, Zheng ret = -EINVAL; 3087f46b5a66SChristoph Hellwig } 3088e441d54dSChris Mason out: 308925122d15SIlya Dryomov mnt_drop_write_file(file); 3090e441d54dSChris Mason return ret; 3091f46b5a66SChristoph Hellwig } 3092f46b5a66SChristoph Hellwig 30932ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3094f46b5a66SChristoph Hellwig { 3095f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3096f46b5a66SChristoph Hellwig int ret; 3097f46b5a66SChristoph Hellwig 3098e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3099e441d54dSChris Mason return -EPERM; 3100e441d54dSChris Mason 3101171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) 3102e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3103c9e9f97bSIlya Dryomov 3104dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3105c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3106c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3107c9e9f97bSIlya Dryomov goto out; 3108c9e9f97bSIlya Dryomov } 3109f46b5a66SChristoph Hellwig 31105516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31112ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3112f46b5a66SChristoph Hellwig 311343d20761SAnand Jain if (!ret) 31140b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 311543d20761SAnand Jain 3116f46b5a66SChristoph Hellwig kfree(vol_args); 3117c9e9f97bSIlya Dryomov out: 3118171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3119f46b5a66SChristoph Hellwig return ret; 3120f46b5a66SChristoph Hellwig } 3121f46b5a66SChristoph Hellwig 31226b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3123f46b5a66SChristoph Hellwig { 31240b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31250b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31266b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3127f46b5a66SChristoph Hellwig int ret; 3128f46b5a66SChristoph Hellwig 3129e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3130e441d54dSChris Mason return -EPERM; 3131e441d54dSChris Mason 3132da24927bSMiao Xie ret = mnt_want_write_file(file); 3133da24927bSMiao Xie if (ret) 3134da24927bSMiao Xie return ret; 3135c146afadSYan Zheng 3136dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3137c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3138c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3139c47ca32dSDan Carpenter goto err_drop; 3140c9e9f97bSIlya Dryomov } 3141f46b5a66SChristoph Hellwig 3142748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3143fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3144fd4e994bSOmar Sandoval goto out; 3145fd4e994bSOmar Sandoval } 3146f46b5a66SChristoph Hellwig 3147171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3148183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3149183860f6SAnand Jain goto out; 3150183860f6SAnand Jain } 3151183860f6SAnand Jain 3152735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31532ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31546b526ed7SAnand Jain } else { 31556b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31562ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31576b526ed7SAnand Jain } 3158171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3159183860f6SAnand Jain 31606b526ed7SAnand Jain if (!ret) { 3161735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31620b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31636b526ed7SAnand Jain vol_args->devid); 31646b526ed7SAnand Jain else 31650b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31666b526ed7SAnand Jain vol_args->name); 31676b526ed7SAnand Jain } 3168183860f6SAnand Jain out: 3169183860f6SAnand Jain kfree(vol_args); 3170c47ca32dSDan Carpenter err_drop: 31714ac20c70SIlya Dryomov mnt_drop_write_file(file); 3172f46b5a66SChristoph Hellwig return ret; 3173f46b5a66SChristoph Hellwig } 3174f46b5a66SChristoph Hellwig 3175f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3176f46b5a66SChristoph Hellwig { 31770b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3179f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3180f46b5a66SChristoph Hellwig int ret; 3181f46b5a66SChristoph Hellwig 3182f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3183f46b5a66SChristoph Hellwig return -EPERM; 3184f46b5a66SChristoph Hellwig 3185f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3186f46b5a66SChristoph Hellwig if (ret) 3187f46b5a66SChristoph Hellwig return ret; 3188f46b5a66SChristoph Hellwig 3189171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3190f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 319158d7bbf8SDavid Sterba goto out_drop_write; 319258d7bbf8SDavid Sterba } 319358d7bbf8SDavid Sterba 319458d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 319558d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 319658d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3197f46b5a66SChristoph Hellwig goto out; 3198f46b5a66SChristoph Hellwig } 3199f46b5a66SChristoph Hellwig 320058d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32012ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3202f46b5a66SChristoph Hellwig 3203f46b5a66SChristoph Hellwig if (!ret) 32040b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3205f46b5a66SChristoph Hellwig kfree(vol_args); 320658d7bbf8SDavid Sterba out: 3207171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 320858d7bbf8SDavid Sterba out_drop_write: 3209f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 321058d7bbf8SDavid Sterba 3211f46b5a66SChristoph Hellwig return ret; 3212f46b5a66SChristoph Hellwig } 3213f46b5a66SChristoph Hellwig 32142ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32152ff7e61eSJeff Mahoney void __user *arg) 3216475f6387SJan Schmidt { 3217027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3218475f6387SJan Schmidt struct btrfs_device *device; 32190b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3220137c5418SJohannes Thumshirn u64 flags_in; 3221027ed2f0SLi Zefan int ret = 0; 3222475f6387SJan Schmidt 3223137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3224137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3225137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3226137c5418SJohannes Thumshirn 3227137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3228137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3229027ed2f0SLi Zefan 3230d03262c7SDavid Sterba rcu_read_lock(); 3231027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3232475f6387SJan Schmidt 3233d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3234027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3235027ed2f0SLi Zefan fi_args->max_id = device->devid; 3236475f6387SJan Schmidt } 3237d03262c7SDavid Sterba rcu_read_unlock(); 3238475f6387SJan Schmidt 3239de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3240bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3241bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3242bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 324380a773fbSDavid Sterba 3244137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3245137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3246137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3247137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3248137c5418SJohannes Thumshirn } 3249137c5418SJohannes Thumshirn 32500fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 32510fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 32520fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 32530fb408a5SJohannes Thumshirn } 32540fb408a5SJohannes Thumshirn 3255027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3256027ed2f0SLi Zefan ret = -EFAULT; 3257475f6387SJan Schmidt 3258027ed2f0SLi Zefan kfree(fi_args); 3259027ed2f0SLi Zefan return ret; 3260475f6387SJan Schmidt } 3261475f6387SJan Schmidt 32622ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32632ff7e61eSJeff Mahoney void __user *arg) 3264475f6387SJan Schmidt { 3265475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3266475f6387SJan Schmidt struct btrfs_device *dev; 3267475f6387SJan Schmidt int ret = 0; 3268475f6387SJan Schmidt char *s_uuid = NULL; 3269475f6387SJan Schmidt 3270475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3271475f6387SJan Schmidt if (IS_ERR(di_args)) 3272475f6387SJan Schmidt return PTR_ERR(di_args); 3273475f6387SJan Schmidt 3274dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3275475f6387SJan Schmidt s_uuid = di_args->uuid; 3276475f6387SJan Schmidt 3277c5593ca3SDavid Sterba rcu_read_lock(); 3278e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 327909ba3bc9SAnand Jain NULL, true); 3280475f6387SJan Schmidt 3281475f6387SJan Schmidt if (!dev) { 3282475f6387SJan Schmidt ret = -ENODEV; 3283475f6387SJan Schmidt goto out; 3284475f6387SJan Schmidt } 3285475f6387SJan Schmidt 3286475f6387SJan Schmidt di_args->devid = dev->devid; 32877cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 32887cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3289475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3290a27202fbSJim Meyering if (dev->name) { 3291672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3292672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3293a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3294a27202fbSJim Meyering } else { 329599ba55adSStefan Behrens di_args->path[0] = '\0'; 3296a27202fbSJim Meyering } 3297475f6387SJan Schmidt 3298475f6387SJan Schmidt out: 3299c5593ca3SDavid Sterba rcu_read_unlock(); 3300475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3301475f6387SJan Schmidt ret = -EFAULT; 3302475f6387SJan Schmidt 3303475f6387SJan Schmidt kfree(di_args); 3304475f6387SJan Schmidt return ret; 3305475f6387SJan Schmidt } 3306475f6387SJan Schmidt 33076ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33086ef5ed0dSJosef Bacik { 3309496ad9aaSAl Viro struct inode *inode = file_inode(file); 33100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33116ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 33126ef5ed0dSJosef Bacik struct btrfs_root *new_root; 33136ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 33146ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 33152a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 33166ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 33176ef5ed0dSJosef Bacik u64 objectid = 0; 33186ef5ed0dSJosef Bacik u64 dir_id; 33193c04ce01SMiao Xie int ret; 33206ef5ed0dSJosef Bacik 33216ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33226ef5ed0dSJosef Bacik return -EPERM; 33236ef5ed0dSJosef Bacik 33243c04ce01SMiao Xie ret = mnt_want_write_file(file); 33253c04ce01SMiao Xie if (ret) 33263c04ce01SMiao Xie return ret; 33273c04ce01SMiao Xie 33283c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33293c04ce01SMiao Xie ret = -EFAULT; 33303c04ce01SMiao Xie goto out; 33313c04ce01SMiao Xie } 33326ef5ed0dSJosef Bacik 33336ef5ed0dSJosef Bacik if (!objectid) 33341cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33356ef5ed0dSJosef Bacik 333656e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 33373c04ce01SMiao Xie if (IS_ERR(new_root)) { 33383c04ce01SMiao Xie ret = PTR_ERR(new_root); 33393c04ce01SMiao Xie goto out; 33403c04ce01SMiao Xie } 33412a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33422a2b5d62SJosef Bacik ret = -ENOENT; 33432a2b5d62SJosef Bacik goto out_free; 33442a2b5d62SJosef Bacik } 33456ef5ed0dSJosef Bacik 33466ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33473c04ce01SMiao Xie if (!path) { 33483c04ce01SMiao Xie ret = -ENOMEM; 33492a2b5d62SJosef Bacik goto out_free; 33503c04ce01SMiao Xie } 33516ef5ed0dSJosef Bacik path->leave_spinning = 1; 33526ef5ed0dSJosef Bacik 33536ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 335498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33553c04ce01SMiao Xie ret = PTR_ERR(trans); 33562a2b5d62SJosef Bacik goto out_free; 33576ef5ed0dSJosef Bacik } 33586ef5ed0dSJosef Bacik 33590b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33600b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33616ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3362cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33632a2b5d62SJosef Bacik btrfs_release_path(path); 33643a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33650b246afaSJeff Mahoney btrfs_err(fs_info, 33665d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 33673c04ce01SMiao Xie ret = -ENOENT; 33682a2b5d62SJosef Bacik goto out_free; 33696ef5ed0dSJosef Bacik } 33706ef5ed0dSJosef Bacik 33716ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33726ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33736ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33742a2b5d62SJosef Bacik btrfs_release_path(path); 33756ef5ed0dSJosef Bacik 33760b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 33773a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33782a2b5d62SJosef Bacik out_free: 337900246528SJosef Bacik btrfs_put_root(new_root); 33802a2b5d62SJosef Bacik btrfs_free_path(path); 33813c04ce01SMiao Xie out: 33823c04ce01SMiao Xie mnt_drop_write_file(file); 33833c04ce01SMiao Xie return ret; 33846ef5ed0dSJosef Bacik } 33856ef5ed0dSJosef Bacik 3386c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3387bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3388bf5fc093SJosef Bacik { 338932da5386SDavid Sterba struct btrfs_block_group *block_group; 3390bf5fc093SJosef Bacik 3391bf5fc093SJosef Bacik space->total_bytes = 0; 3392bf5fc093SJosef Bacik space->used_bytes = 0; 3393bf5fc093SJosef Bacik space->flags = 0; 3394bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3395bf5fc093SJosef Bacik space->flags = block_group->flags; 3396b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3397bf38be65SDavid Sterba space->used_bytes += block_group->used; 3398bf5fc093SJosef Bacik } 3399bf5fc093SJosef Bacik } 3400bf5fc093SJosef Bacik 34012ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34022ff7e61eSJeff Mahoney void __user *arg) 34031406e432SJosef Bacik { 34041406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34051406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34061406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34077fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 340813f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34091406e432SJosef Bacik struct btrfs_space_info *info; 3410315d8e98SColin Ian King static const u64 types[] = { 3411315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3412bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3413bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3414315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3415315d8e98SColin Ian King }; 3416bf5fc093SJosef Bacik int num_types = 4; 34177fde62bfSChris Mason int alloc_size; 34181406e432SJosef Bacik int ret = 0; 341951788b1bSDan Rosenberg u64 slot_count = 0; 3420bf5fc093SJosef Bacik int i, c; 34211406e432SJosef Bacik 34221406e432SJosef Bacik if (copy_from_user(&space_args, 34231406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34241406e432SJosef Bacik sizeof(space_args))) 34251406e432SJosef Bacik return -EFAULT; 34261406e432SJosef Bacik 3427bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3428bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3429bf5fc093SJosef Bacik 3430bf5fc093SJosef Bacik info = NULL; 34317fde62bfSChris Mason rcu_read_lock(); 34320b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3433bf5fc093SJosef Bacik list) { 3434bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3435bf5fc093SJosef Bacik info = tmp; 3436bf5fc093SJosef Bacik break; 3437bf5fc093SJosef Bacik } 3438bf5fc093SJosef Bacik } 34397fde62bfSChris Mason rcu_read_unlock(); 34401406e432SJosef Bacik 3441bf5fc093SJosef Bacik if (!info) 3442bf5fc093SJosef Bacik continue; 3443bf5fc093SJosef Bacik 3444bf5fc093SJosef Bacik down_read(&info->groups_sem); 3445bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3446bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3447bf5fc093SJosef Bacik slot_count++; 3448bf5fc093SJosef Bacik } 3449bf5fc093SJosef Bacik up_read(&info->groups_sem); 3450bf5fc093SJosef Bacik } 3451bf5fc093SJosef Bacik 345236523e95SDavid Sterba /* 345336523e95SDavid Sterba * Global block reserve, exported as a space_info 345436523e95SDavid Sterba */ 345536523e95SDavid Sterba slot_count++; 345636523e95SDavid Sterba 34577fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34587fde62bfSChris Mason if (space_args.space_slots == 0) { 34597fde62bfSChris Mason space_args.total_spaces = slot_count; 34607fde62bfSChris Mason goto out; 34617fde62bfSChris Mason } 3462bf5fc093SJosef Bacik 346351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3464bf5fc093SJosef Bacik 34657fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3466bf5fc093SJosef Bacik 34677fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34687fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34697fde62bfSChris Mason */ 347009cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 34717fde62bfSChris Mason return -ENOMEM; 34727fde62bfSChris Mason 34737fde62bfSChris Mason space_args.total_spaces = 0; 34748d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 34757fde62bfSChris Mason if (!dest) 34767fde62bfSChris Mason return -ENOMEM; 34777fde62bfSChris Mason dest_orig = dest; 34787fde62bfSChris Mason 34797fde62bfSChris Mason /* now we have a buffer to copy into */ 3480bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3481bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3482bf5fc093SJosef Bacik 348351788b1bSDan Rosenberg if (!slot_count) 348451788b1bSDan Rosenberg break; 348551788b1bSDan Rosenberg 3486bf5fc093SJosef Bacik info = NULL; 34871406e432SJosef Bacik rcu_read_lock(); 34880b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3489bf5fc093SJosef Bacik list) { 3490bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3491bf5fc093SJosef Bacik info = tmp; 34927fde62bfSChris Mason break; 3493bf5fc093SJosef Bacik } 3494bf5fc093SJosef Bacik } 3495bf5fc093SJosef Bacik rcu_read_unlock(); 34967fde62bfSChris Mason 3497bf5fc093SJosef Bacik if (!info) 3498bf5fc093SJosef Bacik continue; 3499bf5fc093SJosef Bacik down_read(&info->groups_sem); 3500bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3501bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3502c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3503c065f5b1SSu Yue &space); 35047fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35051406e432SJosef Bacik dest++; 35061406e432SJosef Bacik space_args.total_spaces++; 350751788b1bSDan Rosenberg slot_count--; 35081406e432SJosef Bacik } 350951788b1bSDan Rosenberg if (!slot_count) 351051788b1bSDan Rosenberg break; 3511bf5fc093SJosef Bacik } 3512bf5fc093SJosef Bacik up_read(&info->groups_sem); 3513bf5fc093SJosef Bacik } 35141406e432SJosef Bacik 351536523e95SDavid Sterba /* 351636523e95SDavid Sterba * Add global block reserve 351736523e95SDavid Sterba */ 351836523e95SDavid Sterba if (slot_count) { 35190b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 352036523e95SDavid Sterba 352136523e95SDavid Sterba spin_lock(&block_rsv->lock); 352236523e95SDavid Sterba space.total_bytes = block_rsv->size; 352336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 352436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 352536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 352636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 352736523e95SDavid Sterba space_args.total_spaces++; 352836523e95SDavid Sterba } 352936523e95SDavid Sterba 35302eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35317fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35327fde62bfSChris Mason 35337fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35347fde62bfSChris Mason ret = -EFAULT; 35357fde62bfSChris Mason 35367fde62bfSChris Mason kfree(dest_orig); 35377fde62bfSChris Mason out: 35387fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35391406e432SJosef Bacik ret = -EFAULT; 35401406e432SJosef Bacik 35411406e432SJosef Bacik return ret; 35421406e432SJosef Bacik } 35431406e432SJosef Bacik 35449a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35459a8c28beSMiao Xie void __user *argp) 354646204592SSage Weil { 354746204592SSage Weil struct btrfs_trans_handle *trans; 354846204592SSage Weil u64 transid; 3549db5b493aSTsutomu Itoh int ret; 355046204592SSage Weil 3551d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3552ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3553ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 355498d5dc13STsutomu Itoh return PTR_ERR(trans); 3555ff7c1d33SMiao Xie 3556ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3557ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3558ff7c1d33SMiao Xie goto out; 3559ff7c1d33SMiao Xie } 356046204592SSage Weil transid = trans->transid; 35613a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35628b2b2d3cSTsutomu Itoh if (ret) { 35633a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3564db5b493aSTsutomu Itoh return ret; 35658b2b2d3cSTsutomu Itoh } 3566ff7c1d33SMiao Xie out: 356746204592SSage Weil if (argp) 356846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 356946204592SSage Weil return -EFAULT; 357046204592SSage Weil return 0; 357146204592SSage Weil } 357246204592SSage Weil 35732ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 35749a8c28beSMiao Xie void __user *argp) 357546204592SSage Weil { 357646204592SSage Weil u64 transid; 357746204592SSage Weil 357846204592SSage Weil if (argp) { 357946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 358046204592SSage Weil return -EFAULT; 358146204592SSage Weil } else { 358246204592SSage Weil transid = 0; /* current trans */ 358346204592SSage Weil } 35842ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 358546204592SSage Weil } 358646204592SSage Weil 3587b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3588475f6387SJan Schmidt { 35890b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3590475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3591b8e95489SMiao Xie int ret; 3592475f6387SJan Schmidt 3593475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3594475f6387SJan Schmidt return -EPERM; 3595475f6387SJan Schmidt 3596475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3597475f6387SJan Schmidt if (IS_ERR(sa)) 3598475f6387SJan Schmidt return PTR_ERR(sa); 3599475f6387SJan Schmidt 3600b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3601b8e95489SMiao Xie ret = mnt_want_write_file(file); 3602b8e95489SMiao Xie if (ret) 3603b8e95489SMiao Xie goto out; 3604b8e95489SMiao Xie } 3605b8e95489SMiao Xie 36060b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 360763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 360863a212abSStefan Behrens 0); 3609475f6387SJan Schmidt 36105afe6ce7SFilipe Manana /* 36115afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36125afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36135afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36145afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36155afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 36165afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 36175afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36185afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36195afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36205afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36215afe6ce7SFilipe Manana */ 36225afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3623475f6387SJan Schmidt ret = -EFAULT; 3624475f6387SJan Schmidt 3625b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3626b8e95489SMiao Xie mnt_drop_write_file(file); 3627b8e95489SMiao Xie out: 3628475f6387SJan Schmidt kfree(sa); 3629475f6387SJan Schmidt return ret; 3630475f6387SJan Schmidt } 3631475f6387SJan Schmidt 36322ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3633475f6387SJan Schmidt { 3634475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3635475f6387SJan Schmidt return -EPERM; 3636475f6387SJan Schmidt 36372ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3638475f6387SJan Schmidt } 3639475f6387SJan Schmidt 36402ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3641475f6387SJan Schmidt void __user *arg) 3642475f6387SJan Schmidt { 3643475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3644475f6387SJan Schmidt int ret; 3645475f6387SJan Schmidt 3646475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3647475f6387SJan Schmidt return -EPERM; 3648475f6387SJan Schmidt 3649475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3650475f6387SJan Schmidt if (IS_ERR(sa)) 3651475f6387SJan Schmidt return PTR_ERR(sa); 3652475f6387SJan Schmidt 36532ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3654475f6387SJan Schmidt 36554fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3656475f6387SJan Schmidt ret = -EFAULT; 3657475f6387SJan Schmidt 3658475f6387SJan Schmidt kfree(sa); 3659475f6387SJan Schmidt return ret; 3660475f6387SJan Schmidt } 3661475f6387SJan Schmidt 36622ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3663b27f7c0cSDavid Sterba void __user *arg) 3664c11d2c23SStefan Behrens { 3665c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3666c11d2c23SStefan Behrens int ret; 3667c11d2c23SStefan Behrens 3668c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3669c11d2c23SStefan Behrens if (IS_ERR(sa)) 3670c11d2c23SStefan Behrens return PTR_ERR(sa); 3671c11d2c23SStefan Behrens 3672b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3673b27f7c0cSDavid Sterba kfree(sa); 3674b27f7c0cSDavid Sterba return -EPERM; 3675b27f7c0cSDavid Sterba } 3676b27f7c0cSDavid Sterba 36772ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3678c11d2c23SStefan Behrens 3679eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3680c11d2c23SStefan Behrens ret = -EFAULT; 3681c11d2c23SStefan Behrens 3682c11d2c23SStefan Behrens kfree(sa); 3683c11d2c23SStefan Behrens return ret; 3684c11d2c23SStefan Behrens } 3685c11d2c23SStefan Behrens 36862ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 36872ff7e61eSJeff Mahoney void __user *arg) 36883f6bcfbdSStefan Behrens { 36893f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36903f6bcfbdSStefan Behrens int ret; 36913f6bcfbdSStefan Behrens 36923f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36933f6bcfbdSStefan Behrens return -EPERM; 36943f6bcfbdSStefan Behrens 36953f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36963f6bcfbdSStefan Behrens if (IS_ERR(p)) 36973f6bcfbdSStefan Behrens return PTR_ERR(p); 36983f6bcfbdSStefan Behrens 36993f6bcfbdSStefan Behrens switch (p->cmd) { 37003f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3701bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3702adfa97cbSIlya Dryomov ret = -EROFS; 3703adfa97cbSIlya Dryomov goto out; 3704adfa97cbSIlya Dryomov } 3705171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3706e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37073f6bcfbdSStefan Behrens } else { 37082ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3709171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 37103f6bcfbdSStefan Behrens } 37113f6bcfbdSStefan Behrens break; 37123f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37130b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37143f6bcfbdSStefan Behrens ret = 0; 37153f6bcfbdSStefan Behrens break; 37163f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 371717d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 371897282031SAnand Jain ret = 0; 37193f6bcfbdSStefan Behrens break; 37203f6bcfbdSStefan Behrens default: 37213f6bcfbdSStefan Behrens ret = -EINVAL; 37223f6bcfbdSStefan Behrens break; 37233f6bcfbdSStefan Behrens } 37243f6bcfbdSStefan Behrens 3725d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37263f6bcfbdSStefan Behrens ret = -EFAULT; 3727adfa97cbSIlya Dryomov out: 37283f6bcfbdSStefan Behrens kfree(p); 37293f6bcfbdSStefan Behrens return ret; 37303f6bcfbdSStefan Behrens } 37313f6bcfbdSStefan Behrens 3732d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3733d7728c96SJan Schmidt { 3734d7728c96SJan Schmidt int ret = 0; 3735d7728c96SJan Schmidt int i; 3736740c3d22SChris Mason u64 rel_ptr; 3737d7728c96SJan Schmidt int size; 3738806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3739d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3740d7728c96SJan Schmidt struct btrfs_path *path; 3741d7728c96SJan Schmidt 374282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3743d7728c96SJan Schmidt return -EPERM; 3744d7728c96SJan Schmidt 3745d7728c96SJan Schmidt path = btrfs_alloc_path(); 3746d7728c96SJan Schmidt if (!path) { 3747d7728c96SJan Schmidt ret = -ENOMEM; 3748d7728c96SJan Schmidt goto out; 3749d7728c96SJan Schmidt } 3750d7728c96SJan Schmidt 3751d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3752d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3753d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3754d7728c96SJan Schmidt ipa = NULL; 3755d7728c96SJan Schmidt goto out; 3756d7728c96SJan Schmidt } 3757d7728c96SJan Schmidt 3758d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3759d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3760d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3761d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3762d7728c96SJan Schmidt ipath = NULL; 3763d7728c96SJan Schmidt goto out; 3764d7728c96SJan Schmidt } 3765d7728c96SJan Schmidt 3766d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3767d7728c96SJan Schmidt if (ret < 0) 3768d7728c96SJan Schmidt goto out; 3769d7728c96SJan Schmidt 3770d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3771745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3772745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3773740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3774d7728c96SJan Schmidt } 3775d7728c96SJan Schmidt 3776718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3777718dc5faSOmar Sandoval ipath->fspath, size); 3778d7728c96SJan Schmidt if (ret) { 3779d7728c96SJan Schmidt ret = -EFAULT; 3780d7728c96SJan Schmidt goto out; 3781d7728c96SJan Schmidt } 3782d7728c96SJan Schmidt 3783d7728c96SJan Schmidt out: 3784d7728c96SJan Schmidt btrfs_free_path(path); 3785d7728c96SJan Schmidt free_ipath(ipath); 3786d7728c96SJan Schmidt kfree(ipa); 3787d7728c96SJan Schmidt 3788d7728c96SJan Schmidt return ret; 3789d7728c96SJan Schmidt } 3790d7728c96SJan Schmidt 3791d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3792d7728c96SJan Schmidt { 3793d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3794d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3795d7728c96SJan Schmidt 3796d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3797d7728c96SJan Schmidt inodes->bytes_left -= c; 3798d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3799d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3800d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3801d7728c96SJan Schmidt inodes->elem_cnt += 3; 3802d7728c96SJan Schmidt } else { 3803d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3804d7728c96SJan Schmidt inodes->bytes_left = 0; 3805d7728c96SJan Schmidt inodes->elem_missed += 3; 3806d7728c96SJan Schmidt } 3807d7728c96SJan Schmidt 3808d7728c96SJan Schmidt return 0; 3809d7728c96SJan Schmidt } 3810d7728c96SJan Schmidt 38112ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3812d24a67b2SZygo Blaxell void __user *arg, int version) 3813d7728c96SJan Schmidt { 3814d7728c96SJan Schmidt int ret = 0; 3815d7728c96SJan Schmidt int size; 3816d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3817d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3818d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3819d24a67b2SZygo Blaxell bool ignore_offset; 3820d7728c96SJan Schmidt 3821d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3822d7728c96SJan Schmidt return -EPERM; 3823d7728c96SJan Schmidt 3824d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38257b9ea627SShailendra Verma if (IS_ERR(loi)) 38267b9ea627SShailendra Verma return PTR_ERR(loi); 3827d7728c96SJan Schmidt 3828d24a67b2SZygo Blaxell if (version == 1) { 3829d24a67b2SZygo Blaxell ignore_offset = false; 3830b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3831d24a67b2SZygo Blaxell } else { 3832d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3833d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3834d24a67b2SZygo Blaxell ret = -EINVAL; 3835d24a67b2SZygo Blaxell goto out_loi; 3836d24a67b2SZygo Blaxell } 3837d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3838d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3839d24a67b2SZygo Blaxell ret = -EINVAL; 3840d24a67b2SZygo Blaxell goto out_loi; 3841d24a67b2SZygo Blaxell } 3842d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3843b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3844d24a67b2SZygo Blaxell } 3845d24a67b2SZygo Blaxell 3846d7728c96SJan Schmidt path = btrfs_alloc_path(); 3847d7728c96SJan Schmidt if (!path) { 3848d7728c96SJan Schmidt ret = -ENOMEM; 3849d7728c96SJan Schmidt goto out; 3850d7728c96SJan Schmidt } 3851d7728c96SJan Schmidt 3852d7728c96SJan Schmidt inodes = init_data_container(size); 3853d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3854d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3855d7728c96SJan Schmidt inodes = NULL; 3856d7728c96SJan Schmidt goto out; 3857d7728c96SJan Schmidt } 3858d7728c96SJan Schmidt 38592ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3860d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3861df031f07SLiu Bo if (ret == -EINVAL) 3862d7728c96SJan Schmidt ret = -ENOENT; 3863d7728c96SJan Schmidt if (ret < 0) 3864d7728c96SJan Schmidt goto out; 3865d7728c96SJan Schmidt 3866718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3867718dc5faSOmar Sandoval size); 3868d7728c96SJan Schmidt if (ret) 3869d7728c96SJan Schmidt ret = -EFAULT; 3870d7728c96SJan Schmidt 3871d7728c96SJan Schmidt out: 3872d7728c96SJan Schmidt btrfs_free_path(path); 3873f54de068SDavid Sterba kvfree(inodes); 3874d24a67b2SZygo Blaxell out_loi: 3875d7728c96SJan Schmidt kfree(loi); 3876d7728c96SJan Schmidt 3877d7728c96SJan Schmidt return ret; 3878d7728c96SJan Schmidt } 3879d7728c96SJan Schmidt 3880008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3881c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3882c9e9f97bSIlya Dryomov { 3883c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3884c9e9f97bSIlya Dryomov 3885c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3886c9e9f97bSIlya Dryomov 38873009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3888837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3889837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3890837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3891a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3892a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3893837d5b6eSIlya Dryomov 3894c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3895c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3896c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 389719a39dceSIlya Dryomov 389819a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 389919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 390019a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3901c9e9f97bSIlya Dryomov } 3902c9e9f97bSIlya Dryomov 39039ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3904c9e9f97bSIlya Dryomov { 3905496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3906c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3907c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3908c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3909ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3910c9e9f97bSIlya Dryomov int ret; 3911c9e9f97bSIlya Dryomov 3912c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3913c9e9f97bSIlya Dryomov return -EPERM; 3914c9e9f97bSIlya Dryomov 3915e54bfa31SLiu Bo ret = mnt_want_write_file(file); 39169ba1f6e4SLiu Bo if (ret) 39179ba1f6e4SLiu Bo return ret; 39189ba1f6e4SLiu Bo 3919ed0fb78fSIlya Dryomov again: 3920171938e5SDavid Sterba if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3921c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3922ed0fb78fSIlya Dryomov need_unlock = true; 3923ed0fb78fSIlya Dryomov goto locked; 3924ed0fb78fSIlya Dryomov } 3925ed0fb78fSIlya Dryomov 3926ed0fb78fSIlya Dryomov /* 392701327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3928ed0fb78fSIlya Dryomov * (1) some other op is running 3929ed0fb78fSIlya Dryomov * (2) balance is running 3930ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3931ed0fb78fSIlya Dryomov */ 3932ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3933ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3934ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39353009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3936ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3937dccdb07bSDavid Sterba /* 3938dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3939dccdb07bSDavid Sterba * we'll reexamine the status again. 3940dccdb07bSDavid Sterba */ 3941ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3942ed0fb78fSIlya Dryomov 3943ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39443009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3945ed0fb78fSIlya Dryomov /* this is (3) */ 3946ed0fb78fSIlya Dryomov need_unlock = false; 3947ed0fb78fSIlya Dryomov goto locked; 3948ed0fb78fSIlya Dryomov } 3949ed0fb78fSIlya Dryomov 3950ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3951ed0fb78fSIlya Dryomov goto again; 3952ed0fb78fSIlya Dryomov } else { 3953ed0fb78fSIlya Dryomov /* this is (2) */ 3954ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3955ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3956ed0fb78fSIlya Dryomov goto out; 3957ed0fb78fSIlya Dryomov } 3958ed0fb78fSIlya Dryomov } else { 3959ed0fb78fSIlya Dryomov /* this is (1) */ 3960ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3961e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3962ed0fb78fSIlya Dryomov goto out; 3963ed0fb78fSIlya Dryomov } 3964ed0fb78fSIlya Dryomov 3965ed0fb78fSIlya Dryomov locked: 3966171938e5SDavid Sterba BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); 3967c9e9f97bSIlya Dryomov 3968c9e9f97bSIlya Dryomov if (arg) { 3969c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3970c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3971c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3972ed0fb78fSIlya Dryomov goto out_unlock; 3973c9e9f97bSIlya Dryomov } 3974de322263SIlya Dryomov 3975de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3976de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3977de322263SIlya Dryomov ret = -ENOTCONN; 3978de322263SIlya Dryomov goto out_bargs; 3979de322263SIlya Dryomov } 3980de322263SIlya Dryomov 3981de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3982de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3983de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3984de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3985de322263SIlya Dryomov 3986de322263SIlya Dryomov goto do_balance; 3987de322263SIlya Dryomov } 3988c9e9f97bSIlya Dryomov } else { 3989c9e9f97bSIlya Dryomov bargs = NULL; 3990c9e9f97bSIlya Dryomov } 3991c9e9f97bSIlya Dryomov 3992ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3993837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3994837d5b6eSIlya Dryomov goto out_bargs; 3995837d5b6eSIlya Dryomov } 3996837d5b6eSIlya Dryomov 39978d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3998c9e9f97bSIlya Dryomov if (!bctl) { 3999c9e9f97bSIlya Dryomov ret = -ENOMEM; 4000c9e9f97bSIlya Dryomov goto out_bargs; 4001c9e9f97bSIlya Dryomov } 4002c9e9f97bSIlya Dryomov 4003c9e9f97bSIlya Dryomov if (arg) { 4004c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4005c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4006c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4007c9e9f97bSIlya Dryomov 4008c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4009f43ffb60SIlya Dryomov } else { 4010f43ffb60SIlya Dryomov /* balance everything - no filters */ 4011f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4012c9e9f97bSIlya Dryomov } 4013c9e9f97bSIlya Dryomov 40148eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40158eb93459SDavid Sterba ret = -EINVAL; 40160f89abf5SChristian Engelmayer goto out_bctl; 40178eb93459SDavid Sterba } 40188eb93459SDavid Sterba 4019de322263SIlya Dryomov do_balance: 4020c9e9f97bSIlya Dryomov /* 4021149196a2SDavid Sterba * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to 4022149196a2SDavid Sterba * btrfs_balance. bctl is freed in reset_balance_state, or, if 4023149196a2SDavid Sterba * restriper was paused all the way until unmount, in free_fs_info. 4024149196a2SDavid Sterba * The flag should be cleared after reset_balance_state. 4025c9e9f97bSIlya Dryomov */ 4026ed0fb78fSIlya Dryomov need_unlock = false; 4027ed0fb78fSIlya Dryomov 40286fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40290f89abf5SChristian Engelmayer bctl = NULL; 4030ed0fb78fSIlya Dryomov 4031d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4032c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4033c9e9f97bSIlya Dryomov ret = -EFAULT; 4034c9e9f97bSIlya Dryomov } 4035c9e9f97bSIlya Dryomov 40360f89abf5SChristian Engelmayer out_bctl: 40370f89abf5SChristian Engelmayer kfree(bctl); 4038c9e9f97bSIlya Dryomov out_bargs: 4039c9e9f97bSIlya Dryomov kfree(bargs); 4040ed0fb78fSIlya Dryomov out_unlock: 4041c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4042ed0fb78fSIlya Dryomov if (need_unlock) 4043171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 4044ed0fb78fSIlya Dryomov out: 4045e54bfa31SLiu Bo mnt_drop_write_file(file); 4046c9e9f97bSIlya Dryomov return ret; 4047c9e9f97bSIlya Dryomov } 4048c9e9f97bSIlya Dryomov 40492ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4050837d5b6eSIlya Dryomov { 4051837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4052837d5b6eSIlya Dryomov return -EPERM; 4053837d5b6eSIlya Dryomov 4054837d5b6eSIlya Dryomov switch (cmd) { 4055837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40560b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4057a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40580b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4059837d5b6eSIlya Dryomov } 4060837d5b6eSIlya Dryomov 4061837d5b6eSIlya Dryomov return -EINVAL; 4062837d5b6eSIlya Dryomov } 4063837d5b6eSIlya Dryomov 40642ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 406519a39dceSIlya Dryomov void __user *arg) 406619a39dceSIlya Dryomov { 406719a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 406819a39dceSIlya Dryomov int ret = 0; 406919a39dceSIlya Dryomov 407019a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 407119a39dceSIlya Dryomov return -EPERM; 407219a39dceSIlya Dryomov 407319a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 407419a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 407519a39dceSIlya Dryomov ret = -ENOTCONN; 407619a39dceSIlya Dryomov goto out; 407719a39dceSIlya Dryomov } 407819a39dceSIlya Dryomov 40798d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 408019a39dceSIlya Dryomov if (!bargs) { 408119a39dceSIlya Dryomov ret = -ENOMEM; 408219a39dceSIlya Dryomov goto out; 408319a39dceSIlya Dryomov } 408419a39dceSIlya Dryomov 4085008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 408619a39dceSIlya Dryomov 408719a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 408819a39dceSIlya Dryomov ret = -EFAULT; 408919a39dceSIlya Dryomov 409019a39dceSIlya Dryomov kfree(bargs); 409119a39dceSIlya Dryomov out: 409219a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 409319a39dceSIlya Dryomov return ret; 409419a39dceSIlya Dryomov } 409519a39dceSIlya Dryomov 4096905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40975d13a37bSArne Jansen { 40980b246afaSJeff Mahoney struct inode *inode = file_inode(file); 40990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41005d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41015d13a37bSArne Jansen int ret; 41025d13a37bSArne Jansen 41035d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41045d13a37bSArne Jansen return -EPERM; 41055d13a37bSArne Jansen 4106905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4107905b0ddaSMiao Xie if (ret) 4108905b0ddaSMiao Xie return ret; 41095d13a37bSArne Jansen 41105d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4111905b0ddaSMiao Xie if (IS_ERR(sa)) { 4112905b0ddaSMiao Xie ret = PTR_ERR(sa); 4113905b0ddaSMiao Xie goto drop_write; 4114905b0ddaSMiao Xie } 41155d13a37bSArne Jansen 41160b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 41175d13a37bSArne Jansen 41185d13a37bSArne Jansen switch (sa->cmd) { 41195d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4120340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41215d13a37bSArne Jansen break; 41225d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4123340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41245d13a37bSArne Jansen break; 41255d13a37bSArne Jansen default: 41265d13a37bSArne Jansen ret = -EINVAL; 41275d13a37bSArne Jansen break; 41285d13a37bSArne Jansen } 41295d13a37bSArne Jansen 41305d13a37bSArne Jansen kfree(sa); 41310b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4132905b0ddaSMiao Xie drop_write: 4133905b0ddaSMiao Xie mnt_drop_write_file(file); 41345d13a37bSArne Jansen return ret; 41355d13a37bSArne Jansen } 41365d13a37bSArne Jansen 4137905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41385d13a37bSArne Jansen { 41390b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41400b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41410b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41425d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41435d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41445d13a37bSArne Jansen int ret; 41455d13a37bSArne Jansen int err; 41465d13a37bSArne Jansen 41475d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41485d13a37bSArne Jansen return -EPERM; 41495d13a37bSArne Jansen 4150905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4151905b0ddaSMiao Xie if (ret) 4152905b0ddaSMiao Xie return ret; 41535d13a37bSArne Jansen 41545d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4155905b0ddaSMiao Xie if (IS_ERR(sa)) { 4156905b0ddaSMiao Xie ret = PTR_ERR(sa); 4157905b0ddaSMiao Xie goto drop_write; 4158905b0ddaSMiao Xie } 41595d13a37bSArne Jansen 41605d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41615d13a37bSArne Jansen if (IS_ERR(trans)) { 41625d13a37bSArne Jansen ret = PTR_ERR(trans); 41635d13a37bSArne Jansen goto out; 41645d13a37bSArne Jansen } 41655d13a37bSArne Jansen 41665d13a37bSArne Jansen if (sa->assign) { 41679f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 41685d13a37bSArne Jansen } else { 416939616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 41705d13a37bSArne Jansen } 41715d13a37bSArne Jansen 4172e082f563SQu Wenruo /* update qgroup status and info */ 4173280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4174e082f563SQu Wenruo if (err < 0) 41750b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4176ad8403dfSAnand Jain "failed to update qgroup status and info"); 41773a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 41785d13a37bSArne Jansen if (err && !ret) 41795d13a37bSArne Jansen ret = err; 41805d13a37bSArne Jansen 41815d13a37bSArne Jansen out: 41825d13a37bSArne Jansen kfree(sa); 4183905b0ddaSMiao Xie drop_write: 4184905b0ddaSMiao Xie mnt_drop_write_file(file); 41855d13a37bSArne Jansen return ret; 41865d13a37bSArne Jansen } 41875d13a37bSArne Jansen 4188905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41895d13a37bSArne Jansen { 41900b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41910b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41925d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41935d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41945d13a37bSArne Jansen int ret; 41955d13a37bSArne Jansen int err; 41965d13a37bSArne Jansen 41975d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41985d13a37bSArne Jansen return -EPERM; 41995d13a37bSArne Jansen 4200905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4201905b0ddaSMiao Xie if (ret) 4202905b0ddaSMiao Xie return ret; 42035d13a37bSArne Jansen 42045d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4205905b0ddaSMiao Xie if (IS_ERR(sa)) { 4206905b0ddaSMiao Xie ret = PTR_ERR(sa); 4207905b0ddaSMiao Xie goto drop_write; 4208905b0ddaSMiao Xie } 42095d13a37bSArne Jansen 4210d86e56cfSMiao Xie if (!sa->qgroupid) { 4211d86e56cfSMiao Xie ret = -EINVAL; 4212d86e56cfSMiao Xie goto out; 4213d86e56cfSMiao Xie } 4214d86e56cfSMiao Xie 42155d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42165d13a37bSArne Jansen if (IS_ERR(trans)) { 42175d13a37bSArne Jansen ret = PTR_ERR(trans); 42185d13a37bSArne Jansen goto out; 42195d13a37bSArne Jansen } 42205d13a37bSArne Jansen 42215d13a37bSArne Jansen if (sa->create) { 422249a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42235d13a37bSArne Jansen } else { 42243efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42255d13a37bSArne Jansen } 42265d13a37bSArne Jansen 42273a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42285d13a37bSArne Jansen if (err && !ret) 42295d13a37bSArne Jansen ret = err; 42305d13a37bSArne Jansen 42315d13a37bSArne Jansen out: 42325d13a37bSArne Jansen kfree(sa); 4233905b0ddaSMiao Xie drop_write: 4234905b0ddaSMiao Xie mnt_drop_write_file(file); 42355d13a37bSArne Jansen return ret; 42365d13a37bSArne Jansen } 42375d13a37bSArne Jansen 4238905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42395d13a37bSArne Jansen { 42400b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42410b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42425d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42435d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42445d13a37bSArne Jansen int ret; 42455d13a37bSArne Jansen int err; 42465d13a37bSArne Jansen u64 qgroupid; 42475d13a37bSArne Jansen 42485d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42495d13a37bSArne Jansen return -EPERM; 42505d13a37bSArne Jansen 4251905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4252905b0ddaSMiao Xie if (ret) 4253905b0ddaSMiao Xie return ret; 42545d13a37bSArne Jansen 42555d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4256905b0ddaSMiao Xie if (IS_ERR(sa)) { 4257905b0ddaSMiao Xie ret = PTR_ERR(sa); 4258905b0ddaSMiao Xie goto drop_write; 4259905b0ddaSMiao Xie } 42605d13a37bSArne Jansen 42615d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42625d13a37bSArne Jansen if (IS_ERR(trans)) { 42635d13a37bSArne Jansen ret = PTR_ERR(trans); 42645d13a37bSArne Jansen goto out; 42655d13a37bSArne Jansen } 42665d13a37bSArne Jansen 42675d13a37bSArne Jansen qgroupid = sa->qgroupid; 42685d13a37bSArne Jansen if (!qgroupid) { 42695d13a37bSArne Jansen /* take the current subvol as qgroup */ 42705d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42715d13a37bSArne Jansen } 42725d13a37bSArne Jansen 4273f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 42745d13a37bSArne Jansen 42753a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42765d13a37bSArne Jansen if (err && !ret) 42775d13a37bSArne Jansen ret = err; 42785d13a37bSArne Jansen 42795d13a37bSArne Jansen out: 42805d13a37bSArne Jansen kfree(sa); 4281905b0ddaSMiao Xie drop_write: 4282905b0ddaSMiao Xie mnt_drop_write_file(file); 42835d13a37bSArne Jansen return ret; 42845d13a37bSArne Jansen } 42855d13a37bSArne Jansen 42862f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42872f232036SJan Schmidt { 42880b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42890b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42902f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42912f232036SJan Schmidt int ret; 42922f232036SJan Schmidt 42932f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42942f232036SJan Schmidt return -EPERM; 42952f232036SJan Schmidt 42962f232036SJan Schmidt ret = mnt_want_write_file(file); 42972f232036SJan Schmidt if (ret) 42982f232036SJan Schmidt return ret; 42992f232036SJan Schmidt 43002f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43012f232036SJan Schmidt if (IS_ERR(qsa)) { 43022f232036SJan Schmidt ret = PTR_ERR(qsa); 43032f232036SJan Schmidt goto drop_write; 43042f232036SJan Schmidt } 43052f232036SJan Schmidt 43062f232036SJan Schmidt if (qsa->flags) { 43072f232036SJan Schmidt ret = -EINVAL; 43082f232036SJan Schmidt goto out; 43092f232036SJan Schmidt } 43102f232036SJan Schmidt 43110b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43122f232036SJan Schmidt 43132f232036SJan Schmidt out: 43142f232036SJan Schmidt kfree(qsa); 43152f232036SJan Schmidt drop_write: 43162f232036SJan Schmidt mnt_drop_write_file(file); 43172f232036SJan Schmidt return ret; 43182f232036SJan Schmidt } 43192f232036SJan Schmidt 4320b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4321b929c1d8SMarcos Paulo de Souza void __user *arg) 43222f232036SJan Schmidt { 43232f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43242f232036SJan Schmidt int ret = 0; 43252f232036SJan Schmidt 43262f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43272f232036SJan Schmidt return -EPERM; 43282f232036SJan Schmidt 43298d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43302f232036SJan Schmidt if (!qsa) 43312f232036SJan Schmidt return -ENOMEM; 43322f232036SJan Schmidt 43330b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43342f232036SJan Schmidt qsa->flags = 1; 43350b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43362f232036SJan Schmidt } 43372f232036SJan Schmidt 43382f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43392f232036SJan Schmidt ret = -EFAULT; 43402f232036SJan Schmidt 43412f232036SJan Schmidt kfree(qsa); 43422f232036SJan Schmidt return ret; 43432f232036SJan Schmidt } 43442f232036SJan Schmidt 4345b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4346b929c1d8SMarcos Paulo de Souza void __user *arg) 434757254b6eSJan Schmidt { 434857254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 434957254b6eSJan Schmidt return -EPERM; 435057254b6eSJan Schmidt 43510b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 435257254b6eSJan Schmidt } 435357254b6eSJan Schmidt 4354abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4355abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43568ea05e3aSAlexander Block { 4357496ad9aaSAl Viro struct inode *inode = file_inode(file); 43580b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43598ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43608ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43618ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 436295582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43638ea05e3aSAlexander Block int ret = 0; 4364dd5f9615SStefan Behrens int received_uuid_changed; 43658ea05e3aSAlexander Block 4366bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4367bd60ea0fSDavid Sterba return -EPERM; 4368bd60ea0fSDavid Sterba 43698ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43708ea05e3aSAlexander Block if (ret < 0) 43718ea05e3aSAlexander Block return ret; 43728ea05e3aSAlexander Block 43730b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 43748ea05e3aSAlexander Block 43754a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 43768ea05e3aSAlexander Block ret = -EINVAL; 43778ea05e3aSAlexander Block goto out; 43788ea05e3aSAlexander Block } 43798ea05e3aSAlexander Block 43808ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43818ea05e3aSAlexander Block ret = -EROFS; 43828ea05e3aSAlexander Block goto out; 43838ea05e3aSAlexander Block } 43848ea05e3aSAlexander Block 4385dd5f9615SStefan Behrens /* 4386dd5f9615SStefan Behrens * 1 - root item 4387dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4388dd5f9615SStefan Behrens */ 4389dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43908ea05e3aSAlexander Block if (IS_ERR(trans)) { 43918ea05e3aSAlexander Block ret = PTR_ERR(trans); 43928ea05e3aSAlexander Block trans = NULL; 43938ea05e3aSAlexander Block goto out; 43948ea05e3aSAlexander Block } 43958ea05e3aSAlexander Block 43968ea05e3aSAlexander Block sa->rtransid = trans->transid; 43978ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43988ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43998ea05e3aSAlexander Block 4400dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4401dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4402dd5f9615SStefan Behrens if (received_uuid_changed && 4403d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4404d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4405dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4406dd5f9615SStefan Behrens root->root_key.objectid); 4407d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4408d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4409d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4410d87ff758SNikolay Borisov goto out; 4411d87ff758SNikolay Borisov } 4412d87ff758SNikolay Borisov } 44138ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44148ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44158ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44163cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 44173cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44183cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44193cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44208ea05e3aSAlexander Block 44210b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44228ea05e3aSAlexander Block &root->root_key, &root->root_item); 44238ea05e3aSAlexander Block if (ret < 0) { 44243a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44258ea05e3aSAlexander Block goto out; 4426dd5f9615SStefan Behrens } 4427dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4428cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4429dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4430dd5f9615SStefan Behrens root->root_key.objectid); 4431dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 443266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4433efd38150SNikolay Borisov btrfs_end_transaction(trans); 4434dd5f9615SStefan Behrens goto out; 4435dd5f9615SStefan Behrens } 4436dd5f9615SStefan Behrens } 44373a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4438abccd00fSHugo Mills out: 44390b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4440abccd00fSHugo Mills mnt_drop_write_file(file); 4441abccd00fSHugo Mills return ret; 4442abccd00fSHugo Mills } 4443abccd00fSHugo Mills 4444abccd00fSHugo Mills #ifdef CONFIG_64BIT 4445abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4446abccd00fSHugo Mills void __user *arg) 4447abccd00fSHugo Mills { 4448abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4449abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4450abccd00fSHugo Mills int ret = 0; 4451abccd00fSHugo Mills 4452abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44537b9ea627SShailendra Verma if (IS_ERR(args32)) 44547b9ea627SShailendra Verma return PTR_ERR(args32); 4455abccd00fSHugo Mills 44568d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 445784dbeb87SDan Carpenter if (!args64) { 445884dbeb87SDan Carpenter ret = -ENOMEM; 4459abccd00fSHugo Mills goto out; 4460abccd00fSHugo Mills } 4461abccd00fSHugo Mills 4462abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4463abccd00fSHugo Mills args64->stransid = args32->stransid; 4464abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4465abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4466abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4467abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4468abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4469abccd00fSHugo Mills args64->flags = args32->flags; 4470abccd00fSHugo Mills 4471abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4472abccd00fSHugo Mills if (ret) 4473abccd00fSHugo Mills goto out; 4474abccd00fSHugo Mills 4475abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4476abccd00fSHugo Mills args32->stransid = args64->stransid; 4477abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4478abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4479abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4480abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4481abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4482abccd00fSHugo Mills args32->flags = args64->flags; 4483abccd00fSHugo Mills 4484abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4485abccd00fSHugo Mills if (ret) 4486abccd00fSHugo Mills ret = -EFAULT; 4487abccd00fSHugo Mills 4488abccd00fSHugo Mills out: 4489abccd00fSHugo Mills kfree(args32); 4490abccd00fSHugo Mills kfree(args64); 4491abccd00fSHugo Mills return ret; 4492abccd00fSHugo Mills } 4493abccd00fSHugo Mills #endif 4494abccd00fSHugo Mills 4495abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4496abccd00fSHugo Mills void __user *arg) 4497abccd00fSHugo Mills { 4498abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4499abccd00fSHugo Mills int ret = 0; 4500abccd00fSHugo Mills 4501abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45027b9ea627SShailendra Verma if (IS_ERR(sa)) 45037b9ea627SShailendra Verma return PTR_ERR(sa); 4504abccd00fSHugo Mills 4505abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4506abccd00fSHugo Mills 4507abccd00fSHugo Mills if (ret) 4508abccd00fSHugo Mills goto out; 4509abccd00fSHugo Mills 45108ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45118ea05e3aSAlexander Block if (ret) 45128ea05e3aSAlexander Block ret = -EFAULT; 45138ea05e3aSAlexander Block 45148ea05e3aSAlexander Block out: 45158ea05e3aSAlexander Block kfree(sa); 45168ea05e3aSAlexander Block return ret; 45178ea05e3aSAlexander Block } 45188ea05e3aSAlexander Block 4519b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4520b929c1d8SMarcos Paulo de Souza void __user *arg) 4521867ab667Sjeff.liu { 4522a1b83ac5SAnand Jain size_t len; 4523867ab667Sjeff.liu int ret; 4524a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4525a1b83ac5SAnand Jain 45260b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45270b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45280b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4529a1b83ac5SAnand Jain 4530a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4531867ab667Sjeff.liu 4532867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45330b246afaSJeff Mahoney btrfs_warn(fs_info, 45340b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45350b246afaSJeff Mahoney --len); 4536867ab667Sjeff.liu } 4537867ab667Sjeff.liu 4538867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4539867ab667Sjeff.liu 4540867ab667Sjeff.liu return ret ? -EFAULT : 0; 4541867ab667Sjeff.liu } 4542867ab667Sjeff.liu 4543a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4544a8bfd4abSjeff.liu { 45450b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45460b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45470b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45480b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4549a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4550a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4551a8bfd4abSjeff.liu int ret; 4552a8bfd4abSjeff.liu 4553a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4554a8bfd4abSjeff.liu return -EPERM; 4555a8bfd4abSjeff.liu 4556a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4557a8bfd4abSjeff.liu return -EFAULT; 4558a8bfd4abSjeff.liu 4559a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45600b246afaSJeff Mahoney btrfs_err(fs_info, 45615d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4562a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4563a8bfd4abSjeff.liu return -EINVAL; 4564a8bfd4abSjeff.liu } 4565a8bfd4abSjeff.liu 4566a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4567a8bfd4abSjeff.liu if (ret) 4568a8bfd4abSjeff.liu return ret; 4569a8bfd4abSjeff.liu 4570a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4571a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4572a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4573a8bfd4abSjeff.liu goto out_unlock; 4574a8bfd4abSjeff.liu } 4575a8bfd4abSjeff.liu 45760b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4577a8bfd4abSjeff.liu strcpy(super_block->label, label); 45780b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 45793a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4580a8bfd4abSjeff.liu 4581a8bfd4abSjeff.liu out_unlock: 4582a8bfd4abSjeff.liu mnt_drop_write_file(file); 4583a8bfd4abSjeff.liu return ret; 4584a8bfd4abSjeff.liu } 4585a8bfd4abSjeff.liu 45862eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 45872eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 45882eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 45892eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 45902eaa055fSJeff Mahoney 4591d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 45922eaa055fSJeff Mahoney { 45934d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 45942eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 45952eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 45962eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 45972eaa055fSJeff Mahoney }; 45982eaa055fSJeff Mahoney 45992eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46002eaa055fSJeff Mahoney return -EFAULT; 46012eaa055fSJeff Mahoney 46022eaa055fSJeff Mahoney return 0; 46032eaa055fSJeff Mahoney } 46042eaa055fSJeff Mahoney 4605b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4606b929c1d8SMarcos Paulo de Souza void __user *arg) 46072eaa055fSJeff Mahoney { 46080b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46092eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46102eaa055fSJeff Mahoney 46112eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46122eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46132eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46142eaa055fSJeff Mahoney 46152eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46162eaa055fSJeff Mahoney return -EFAULT; 46172eaa055fSJeff Mahoney 46182eaa055fSJeff Mahoney return 0; 46192eaa055fSJeff Mahoney } 46202eaa055fSJeff Mahoney 46212ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46223b02a68aSJeff Mahoney enum btrfs_feature_set set, 46232eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46242eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46252eaa055fSJeff Mahoney { 4626f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46273b02a68aSJeff Mahoney char *names; 46282eaa055fSJeff Mahoney u64 disallowed, unsupported; 46292eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46302eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46312eaa055fSJeff Mahoney 46322eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46332eaa055fSJeff Mahoney if (unsupported) { 46343b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46353b02a68aSJeff Mahoney if (names) { 46360b246afaSJeff Mahoney btrfs_warn(fs_info, 46373b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46383b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46393b02a68aSJeff Mahoney kfree(names); 46403b02a68aSJeff Mahoney } else 46410b246afaSJeff Mahoney btrfs_warn(fs_info, 46422eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46432eaa055fSJeff Mahoney type, unsupported); 46442eaa055fSJeff Mahoney return -EOPNOTSUPP; 46452eaa055fSJeff Mahoney } 46462eaa055fSJeff Mahoney 46472eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46482eaa055fSJeff Mahoney if (disallowed) { 46493b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46503b02a68aSJeff Mahoney if (names) { 46510b246afaSJeff Mahoney btrfs_warn(fs_info, 46523b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46533b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46543b02a68aSJeff Mahoney kfree(names); 46553b02a68aSJeff Mahoney } else 46560b246afaSJeff Mahoney btrfs_warn(fs_info, 46572eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46582eaa055fSJeff Mahoney type, disallowed); 46592eaa055fSJeff Mahoney return -EPERM; 46602eaa055fSJeff Mahoney } 46612eaa055fSJeff Mahoney 46622eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46632eaa055fSJeff Mahoney if (disallowed) { 46643b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46653b02a68aSJeff Mahoney if (names) { 46660b246afaSJeff Mahoney btrfs_warn(fs_info, 46673b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 46683b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46693b02a68aSJeff Mahoney kfree(names); 46703b02a68aSJeff Mahoney } else 46710b246afaSJeff Mahoney btrfs_warn(fs_info, 46722eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 46732eaa055fSJeff Mahoney type, disallowed); 46742eaa055fSJeff Mahoney return -EPERM; 46752eaa055fSJeff Mahoney } 46762eaa055fSJeff Mahoney 46772eaa055fSJeff Mahoney return 0; 46782eaa055fSJeff Mahoney } 46792eaa055fSJeff Mahoney 46802ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 46812ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 46822eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 46832eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 46842eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 46852eaa055fSJeff Mahoney 46862eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 46872eaa055fSJeff Mahoney { 46880b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46890b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46900b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46910b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46922eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 46932eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 46942eaa055fSJeff Mahoney u64 newflags; 46952eaa055fSJeff Mahoney int ret; 46962eaa055fSJeff Mahoney 46972eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 46982eaa055fSJeff Mahoney return -EPERM; 46992eaa055fSJeff Mahoney 47002eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47012eaa055fSJeff Mahoney return -EFAULT; 47022eaa055fSJeff Mahoney 47032eaa055fSJeff Mahoney /* Nothing to do */ 47042eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47052eaa055fSJeff Mahoney !flags[0].incompat_flags) 47062eaa055fSJeff Mahoney return 0; 47072eaa055fSJeff Mahoney 47082ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47092eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47102eaa055fSJeff Mahoney if (ret) 47112eaa055fSJeff Mahoney return ret; 47122eaa055fSJeff Mahoney 47132ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47142eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47152eaa055fSJeff Mahoney if (ret) 47162eaa055fSJeff Mahoney return ret; 47172eaa055fSJeff Mahoney 47182ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47192eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47202eaa055fSJeff Mahoney if (ret) 47212eaa055fSJeff Mahoney return ret; 47222eaa055fSJeff Mahoney 47237ab19625SDavid Sterba ret = mnt_want_write_file(file); 47247ab19625SDavid Sterba if (ret) 47257ab19625SDavid Sterba return ret; 47267ab19625SDavid Sterba 47278051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47287ab19625SDavid Sterba if (IS_ERR(trans)) { 47297ab19625SDavid Sterba ret = PTR_ERR(trans); 47307ab19625SDavid Sterba goto out_drop_write; 47317ab19625SDavid Sterba } 47322eaa055fSJeff Mahoney 47330b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47342eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47352eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47362eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47372eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47382eaa055fSJeff Mahoney 47392eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47402eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47412eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47422eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47432eaa055fSJeff Mahoney 47442eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47452eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47462eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47472eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47480b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47492eaa055fSJeff Mahoney 47503a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47517ab19625SDavid Sterba out_drop_write: 47527ab19625SDavid Sterba mnt_drop_write_file(file); 47537ab19625SDavid Sterba 47547ab19625SDavid Sterba return ret; 47552eaa055fSJeff Mahoney } 47562eaa055fSJeff Mahoney 47572351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47582351f431SJosef Bacik { 47592351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47602351f431SJosef Bacik int ret; 47612351f431SJosef Bacik 47622351f431SJosef Bacik if (compat) { 47632351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47642351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 47652351f431SJosef Bacik 47662351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 47672351f431SJosef Bacik if (ret) 47682351f431SJosef Bacik return -EFAULT; 47692351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 47702351f431SJosef Bacik if (!arg) 47712351f431SJosef Bacik return -ENOMEM; 47722351f431SJosef Bacik arg->send_fd = args32.send_fd; 47732351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 47742351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 47752351f431SJosef Bacik arg->parent_root = args32.parent_root; 47762351f431SJosef Bacik arg->flags = args32.flags; 47772351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 47782351f431SJosef Bacik sizeof(args32.reserved)); 47792351f431SJosef Bacik #else 47802351f431SJosef Bacik return -ENOTTY; 47812351f431SJosef Bacik #endif 47822351f431SJosef Bacik } else { 47832351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 47842351f431SJosef Bacik if (IS_ERR(arg)) 47852351f431SJosef Bacik return PTR_ERR(arg); 47862351f431SJosef Bacik } 47872351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 47882351f431SJosef Bacik kfree(arg); 47892351f431SJosef Bacik return ret; 47902351f431SJosef Bacik } 47912351f431SJosef Bacik 4792f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4793f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4794f46b5a66SChristoph Hellwig { 47950b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47970b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47984bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4799f46b5a66SChristoph Hellwig 4800f46b5a66SChristoph Hellwig switch (cmd) { 48016cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48026cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48036cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48046cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48056cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48066cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 480740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4808b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 480940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 481040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4811f7039b1dSLi Dongyang case FITRIM: 4812b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4813f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4814fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4815fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4816fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 48173de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4818fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48196f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48206f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 482176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4822949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4823949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4824949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48250caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48260caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48270caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48280caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48296ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48306ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4831f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48321e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48331e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48341e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4835f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4836198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4837f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48382ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4839f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4840da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48416b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48426b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4843475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48442ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4845475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48462ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4847f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48489ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4849ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4850ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4851cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4852cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4853ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4854ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4855d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4856d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4857d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4858d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4859d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4860d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48611406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48622ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48639b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48649b199859SFilipe David Borba Manana int ret; 48659b199859SFilipe David Borba Manana 486682b3e53bSNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, -1); 48679b199859SFilipe David Borba Manana if (ret) 48689b199859SFilipe David Borba Manana return ret; 48690b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 48702fad4e83SDavid Sterba /* 48712fad4e83SDavid Sterba * The transaction thread may want to do more work, 487201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 48732fad4e83SDavid Sterba * processing uncleaned subvols. 48742fad4e83SDavid Sterba */ 48750b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 48769b199859SFilipe David Borba Manana return ret; 48779b199859SFilipe David Borba Manana } 487846204592SSage Weil case BTRFS_IOC_START_SYNC: 48799a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 488046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 48812ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4882475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4883b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4884475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 48852ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4886475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 48872ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4888c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 48899ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4890837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 48912ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 489219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 48932ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 48948ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 48958ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4896abccd00fSHugo Mills #ifdef CONFIG_64BIT 4897abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4898abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4899abccd00fSHugo Mills #endif 490031db9f7cSAlexander Block case BTRFS_IOC_SEND: 49012351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49022351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49032351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49042351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49052351f431SJosef Bacik #endif 4906c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49072ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49085d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4909905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49105d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4911905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49125d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4913905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49145d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4915905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49162f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 49172f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49182f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4919b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 492057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4921b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49223f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49232ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49242eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4925d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49262eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4927b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49282eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49292eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4930e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 4931e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 4932025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 4933025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 4934b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4935b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 493642e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 493742e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 493823d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 493923d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4940f46b5a66SChristoph Hellwig } 4941f46b5a66SChristoph Hellwig 4942f46b5a66SChristoph Hellwig return -ENOTTY; 4943f46b5a66SChristoph Hellwig } 49444c63c245SLuke Dashjr 49454c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49464c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49474c63c245SLuke Dashjr { 49482a362249SJeff Mahoney /* 49492a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49502a362249SJeff Mahoney * handling is necessary. 49512a362249SJeff Mahoney */ 49524c63c245SLuke Dashjr switch (cmd) { 49534c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 49544c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 49554c63c245SLuke Dashjr break; 49564c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 49574c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 49584c63c245SLuke Dashjr break; 49594c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49604c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49614c63c245SLuke Dashjr break; 49624c63c245SLuke Dashjr } 49634c63c245SLuke Dashjr 49644c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 49654c63c245SLuke Dashjr } 49664c63c245SLuke Dashjr #endif 4967