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; 569f46b5a66SChristoph Hellwig u64 objectid; 570f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 5713de4586cSChris Mason u64 index = 0; 572f46b5a66SChristoph Hellwig 57349a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 57449a3c4d9SDavid Sterba if (!root_item) 57549a3c4d9SDavid Sterba return -ENOMEM; 57649a3c4d9SDavid Sterba 5770b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 5782fbe8c8aSAl Viro if (ret) 57949a3c4d9SDavid Sterba goto fail_free; 5806a912213SJosef Bacik 581e09fe2d2SQu Wenruo /* 582e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 58301327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 584e09fe2d2SQu Wenruo */ 58549a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 58649a3c4d9SDavid Sterba ret = -ENOSPC; 58749a3c4d9SDavid Sterba goto fail_free; 58849a3c4d9SDavid Sterba } 589e09fe2d2SQu Wenruo 590d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5919ed74f2dSJosef Bacik /* 592d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 593d5c12070SMiao Xie * of create_snapshot(). 5949ed74f2dSJosef Bacik */ 595c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 596d5c12070SMiao Xie if (ret) 59749a3c4d9SDavid Sterba goto fail_free; 598f46b5a66SChristoph Hellwig 599d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 600d5c12070SMiao Xie if (IS_ERR(trans)) { 601d5c12070SMiao Xie ret = PTR_ERR(trans); 6027775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 60349a3c4d9SDavid Sterba goto fail_free; 604d5c12070SMiao Xie } 605d5c12070SMiao Xie trans->block_rsv = &block_rsv; 606d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 607f46b5a66SChristoph Hellwig 608a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6096f72c7e2SArne Jansen if (ret) 6106f72c7e2SArne Jansen goto fail; 6116f72c7e2SArne Jansen 6124d75f8a9SDavid Sterba leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); 6138e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6148e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6158e8a1e31SJosef Bacik goto fail; 6168e8a1e31SJosef Bacik } 617f46b5a66SChristoph Hellwig 618f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 619f46b5a66SChristoph Hellwig 62049a3c4d9SDavid Sterba inode_item = &root_item->inode; 6213cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6223cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6233cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 624da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6250b246afaSJeff Mahoney fs_info->nodesize); 6263cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 627f46b5a66SChristoph Hellwig 62849a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 62949a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6303cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 63108fe4db1SLi Zefan 63249a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 63349a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 63449a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 63549a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 63649a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 63749a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 638f46b5a66SChristoph Hellwig 63949a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 64049a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 641807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 64249a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 64349a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 64449a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 64549a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 64649a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 647f46b5a66SChristoph Hellwig 648925baeddSChris Mason btrfs_tree_unlock(leaf); 649f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 650f46b5a66SChristoph Hellwig leaf = NULL; 651f46b5a66SChristoph Hellwig 65249a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 653f46b5a66SChristoph Hellwig 654f46b5a66SChristoph Hellwig key.objectid = objectid; 6555d4f98a2SYan Zheng key.offset = 0; 656962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6570b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 65849a3c4d9SDavid Sterba root_item); 659f46b5a66SChristoph Hellwig if (ret) 660f46b5a66SChristoph Hellwig goto fail; 661f46b5a66SChristoph Hellwig 66276dda93cSYan, Zheng key.offset = (u64)-1; 6633619c94fSJosef Bacik new_root = btrfs_get_fs_root(fs_info, &key, true); 66479787eaaSJeff Mahoney if (IS_ERR(new_root)) { 66579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 66666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 66779787eaaSJeff Mahoney goto fail; 66879787eaaSJeff Mahoney } 66976dda93cSYan, Zheng 67076dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 67176dda93cSYan, Zheng 67263541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 67300246528SJosef Bacik btrfs_put_root(new_root); 674ce598979SMark Fasheh if (ret) { 675ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 67666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 677ce598979SMark Fasheh goto fail; 678ce598979SMark Fasheh } 679ce598979SMark Fasheh 680f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 681f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 682f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 683f32e48e9SChandan Rajendra 684f46b5a66SChristoph Hellwig /* 685f46b5a66SChristoph Hellwig * insert the directory item 686f46b5a66SChristoph Hellwig */ 687877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 68879787eaaSJeff Mahoney if (ret) { 68966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 69079787eaaSJeff Mahoney goto fail; 69179787eaaSJeff Mahoney } 6923de4586cSChris Mason 693684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6943de4586cSChris Mason BTRFS_FT_DIR, index); 69579787eaaSJeff Mahoney if (ret) { 69666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 697f46b5a66SChristoph Hellwig goto fail; 69879787eaaSJeff Mahoney } 6990660b5afSChris Mason 7006ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 70152c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 702c7e54b51SJosef Bacik if (ret) { 703c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 704c7e54b51SJosef Bacik goto fail; 705c7e54b51SJosef Bacik } 70652c26179SYan Zheng 7076025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7084a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 709c7e54b51SJosef Bacik if (ret) { 710c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 711c7e54b51SJosef Bacik goto fail; 712c7e54b51SJosef Bacik } 7130660b5afSChris Mason 714cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7156bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 716dd5f9615SStefan Behrens if (ret) 71766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 718dd5f9615SStefan Behrens 719f46b5a66SChristoph Hellwig fail: 72049a3c4d9SDavid Sterba kfree(root_item); 721d5c12070SMiao Xie trans->block_rsv = NULL; 722d5c12070SMiao Xie trans->bytes_reserved = 0; 7237775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &block_rsv); 724de6e8200SLiu Bo 7253a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 726f46b5a66SChristoph Hellwig if (err && !ret) 727f46b5a66SChristoph Hellwig ret = err; 7281a65e24bSChris Mason 7295662344bSTsutomu Itoh if (!ret) { 7305662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 731de6e8200SLiu Bo if (IS_ERR(inode)) 732de6e8200SLiu Bo return PTR_ERR(inode); 7335662344bSTsutomu Itoh d_instantiate(dentry, inode); 7345662344bSTsutomu Itoh } 735f46b5a66SChristoph Hellwig return ret; 73649a3c4d9SDavid Sterba 73749a3c4d9SDavid Sterba fail_free: 73849a3c4d9SDavid Sterba kfree(root_item); 73949a3c4d9SDavid Sterba return ret; 740f46b5a66SChristoph Hellwig } 741f46b5a66SChristoph Hellwig 742e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7439babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 744e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 745f46b5a66SChristoph Hellwig { 7460b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7472e4bfab9SYan, Zheng struct inode *inode; 748f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 749f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7502e4bfab9SYan, Zheng int ret; 751f46b5a66SChristoph Hellwig 75292a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 753f46b5a66SChristoph Hellwig return -EINVAL; 754f46b5a66SChristoph Hellwig 755eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 756eede2bf3SOmar Sandoval btrfs_warn(fs_info, 757eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 758eede2bf3SOmar Sandoval return -ETXTBSY; 759eede2bf3SOmar Sandoval } 760eede2bf3SOmar Sandoval 76123269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 762a1ee7362SDavid Sterba if (!pending_snapshot) 763a1ee7362SDavid Sterba return -ENOMEM; 764a1ee7362SDavid Sterba 765b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 76623269bf5SDavid Sterba GFP_KERNEL); 7678546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7688546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 769b0c0ea63SDavid Sterba ret = -ENOMEM; 770b0c0ea63SDavid Sterba goto free_pending; 771b0c0ea63SDavid Sterba } 772b0c0ea63SDavid Sterba 77366d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 77466d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 775d5c12070SMiao Xie /* 776d5c12070SMiao Xie * 1 - parent dir inode 777d5c12070SMiao Xie * 2 - dir entries 778d5c12070SMiao Xie * 1 - root item 779d5c12070SMiao Xie * 2 - root ref/backref 780d5c12070SMiao Xie * 1 - root of snapshot 781dd5f9615SStefan Behrens * 1 - UUID item 782d5c12070SMiao Xie */ 783d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 784dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 785ee3441b4SJeff Mahoney false); 786d5c12070SMiao Xie if (ret) 787c11fbb6eSRobbie Ko goto free_pending; 788d5c12070SMiao Xie 789a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 790a22285a6SYan, Zheng pending_snapshot->root = root; 791b83cc969SLi Zefan pending_snapshot->readonly = readonly; 792e9662f70SMiao Xie pending_snapshot->dir = dir; 7938696c533SMiao Xie pending_snapshot->inherit = inherit; 794a22285a6SYan, Zheng 795d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 796a22285a6SYan, Zheng if (IS_ERR(trans)) { 797a22285a6SYan, Zheng ret = PTR_ERR(trans); 798a22285a6SYan, Zheng goto fail; 799a22285a6SYan, Zheng } 800a22285a6SYan, Zheng 8010b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 802a22285a6SYan, Zheng list_add(&pending_snapshot->list, 803a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8040b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8059babda9fSNikolay Borisov 8063a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 807aec8030aSMiao Xie if (ret) 808c37b2b62SJosef Bacik goto fail; 809a22285a6SYan, Zheng 810a22285a6SYan, Zheng ret = pending_snapshot->error; 811f46b5a66SChristoph Hellwig if (ret) 8122e4bfab9SYan, Zheng goto fail; 813f46b5a66SChristoph Hellwig 814d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 815d3797308SChris Mason if (ret) 816d3797308SChris Mason goto fail; 817d3797308SChris Mason 8182b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8192e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8202e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8212e4bfab9SYan, Zheng goto fail; 8222e4bfab9SYan, Zheng } 8235662344bSTsutomu Itoh 8242e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8252e4bfab9SYan, Zheng ret = 0; 8262e4bfab9SYan, Zheng fail: 82700246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 8287775c818SDavid Sterba btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv); 829b0c0ea63SDavid Sterba free_pending: 830b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8318546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 832a1ee7362SDavid Sterba kfree(pending_snapshot); 833a1ee7362SDavid Sterba 834f46b5a66SChristoph Hellwig return ret; 835f46b5a66SChristoph Hellwig } 836f46b5a66SChristoph Hellwig 8374260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8384260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8394260f7c7SSage Weil * whether the type of victim is right. 8404260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8414260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8424260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8434260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8444260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8454260f7c7SSage Weil * a. be owner of dir, or 8464260f7c7SSage Weil * b. be owner of victim, or 8474260f7c7SSage Weil * c. have CAP_FOWNER capability 84801327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8494260f7c7SSage Weil * links pointing to it. 8504260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8514260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8524260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8534260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8544260f7c7SSage Weil * nfs_async_unlink(). 8554260f7c7SSage Weil */ 8564260f7c7SSage Weil 8574260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 8584260f7c7SSage Weil { 8594260f7c7SSage Weil int error; 8604260f7c7SSage Weil 8612b0143b5SDavid Howells if (d_really_is_negative(victim)) 8624260f7c7SSage Weil return -ENOENT; 8634260f7c7SSage Weil 8642b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8654fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8664260f7c7SSage Weil 8674260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 8684260f7c7SSage Weil if (error) 8694260f7c7SSage Weil return error; 8704260f7c7SSage Weil if (IS_APPEND(dir)) 8714260f7c7SSage Weil return -EPERM; 8722b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 8732b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 8744260f7c7SSage Weil return -EPERM; 8754260f7c7SSage Weil if (isdir) { 876e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8774260f7c7SSage Weil return -ENOTDIR; 8784260f7c7SSage Weil if (IS_ROOT(victim)) 8794260f7c7SSage Weil return -EBUSY; 880e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8814260f7c7SSage Weil return -EISDIR; 8824260f7c7SSage Weil if (IS_DEADDIR(dir)) 8834260f7c7SSage Weil return -ENOENT; 8844260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8854260f7c7SSage Weil return -EBUSY; 8864260f7c7SSage Weil return 0; 8874260f7c7SSage Weil } 8884260f7c7SSage Weil 889cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 890cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 891cb8e7090SChristoph Hellwig { 8922b0143b5SDavid Howells if (d_really_is_positive(child)) 893cb8e7090SChristoph Hellwig return -EEXIST; 894cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 895cb8e7090SChristoph Hellwig return -ENOENT; 896cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 897cb8e7090SChristoph Hellwig } 898cb8e7090SChristoph Hellwig 899cb8e7090SChristoph Hellwig /* 900cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 901cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 902cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 903cb8e7090SChristoph Hellwig */ 90492872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 90552f75f4fSDavid Sterba const char *name, int namelen, 90672fd032eSSage Weil struct btrfs_root *snap_src, 9079babda9fSNikolay Borisov bool readonly, 9088696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 909cb8e7090SChristoph Hellwig { 9102b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 912cb8e7090SChristoph Hellwig struct dentry *dentry; 913cb8e7090SChristoph Hellwig int error; 914cb8e7090SChristoph Hellwig 91500235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 91600235411SAl Viro if (error == -EINTR) 91700235411SAl Viro return error; 918cb8e7090SChristoph Hellwig 919cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 920cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 921cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 922cb8e7090SChristoph Hellwig goto out_unlock; 923cb8e7090SChristoph Hellwig 92476dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 925cb8e7090SChristoph Hellwig if (error) 926a874a63eSLiu Bo goto out_dput; 927cb8e7090SChristoph Hellwig 9289c52057cSChris Mason /* 9299c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9309c52057cSChris Mason * check for them now when we can safely fail 9319c52057cSChris Mason */ 9329c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9339c52057cSChris Mason dir->i_ino, name, 9349c52057cSChris Mason namelen); 9359c52057cSChris Mason if (error) 9369c52057cSChris Mason goto out_dput; 9379c52057cSChris Mason 9380b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 93976dda93cSYan, Zheng 94076dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 94176dda93cSYan, Zheng goto out_up_read; 94276dda93cSYan, Zheng 9439babda9fSNikolay Borisov if (snap_src) 9449babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9459babda9fSNikolay Borisov else 9469babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 9479babda9fSNikolay Borisov 94876dda93cSYan, Zheng if (!error) 94976dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 95076dda93cSYan, Zheng out_up_read: 9510b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 952cb8e7090SChristoph Hellwig out_dput: 953cb8e7090SChristoph Hellwig dput(dentry); 954cb8e7090SChristoph Hellwig out_unlock: 9555955102cSAl Viro inode_unlock(dir); 956cb8e7090SChristoph Hellwig return error; 957cb8e7090SChristoph Hellwig } 958cb8e7090SChristoph Hellwig 959c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 960c11fbb6eSRobbie Ko const char *name, int namelen, 961c11fbb6eSRobbie Ko struct btrfs_root *root, 962c11fbb6eSRobbie Ko bool readonly, 963c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 964c11fbb6eSRobbie Ko { 965c11fbb6eSRobbie Ko int ret; 966c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 967c11fbb6eSRobbie Ko 968c11fbb6eSRobbie Ko /* 969c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 970c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 971c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 972c11fbb6eSRobbie Ko */ 973c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 974c11fbb6eSRobbie Ko 975c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 976c11fbb6eSRobbie Ko if (ret) 977c11fbb6eSRobbie Ko goto out; 978c11fbb6eSRobbie Ko 979c11fbb6eSRobbie Ko /* 980c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 981c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 982c11fbb6eSRobbie Ko * creation. 983c11fbb6eSRobbie Ko */ 984c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 985c11fbb6eSRobbie Ko snapshot_force_cow = true; 986c11fbb6eSRobbie Ko 987c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 988c11fbb6eSRobbie Ko 989c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 990c11fbb6eSRobbie Ko root, readonly, inherit); 991c11fbb6eSRobbie Ko out: 992c11fbb6eSRobbie Ko if (snapshot_force_cow) 993c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 994c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 995c11fbb6eSRobbie Ko return ret; 996c11fbb6eSRobbie Ko } 997c11fbb6eSRobbie Ko 9984cb5300bSChris Mason /* 9994cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10004cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10014cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10024cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10034cb5300bSChris Mason * part of the file 10044cb5300bSChris Mason */ 1005aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10064cb5300bSChris Mason { 10074cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10084cb5300bSChris Mason struct extent_map *em = NULL; 10094cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10104cb5300bSChris Mason u64 end; 10114cb5300bSChris Mason 10124cb5300bSChris Mason read_lock(&em_tree->lock); 101309cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10144cb5300bSChris Mason read_unlock(&em_tree->lock); 10154cb5300bSChris Mason 10164cb5300bSChris Mason if (em) { 10174cb5300bSChris Mason end = extent_map_end(em); 10184cb5300bSChris Mason free_extent_map(em); 10194cb5300bSChris Mason if (end - offset > thresh) 10204cb5300bSChris Mason return 0; 10214cb5300bSChris Mason } 10224cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10234cb5300bSChris Mason thresh /= 2; 10244cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10254cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10264cb5300bSChris Mason if (end >= thresh) 10274cb5300bSChris Mason return 0; 10284cb5300bSChris Mason return 1; 10294cb5300bSChris Mason } 10304cb5300bSChris Mason 10314cb5300bSChris Mason /* 10324cb5300bSChris Mason * helper function to walk through a file and find extents 10334cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10344cb5300bSChris Mason * 10354cb5300bSChris Mason * This is used by the defragging code to find new and small 10364cb5300bSChris Mason * extents 10374cb5300bSChris Mason */ 10384cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10394cb5300bSChris Mason struct inode *inode, u64 newer_than, 1040aab110abSDavid Sterba u64 *off, u32 thresh) 10414cb5300bSChris Mason { 10424cb5300bSChris Mason struct btrfs_path *path; 10434cb5300bSChris Mason struct btrfs_key min_key; 10444cb5300bSChris Mason struct extent_buffer *leaf; 10454cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10464cb5300bSChris Mason int type; 10474cb5300bSChris Mason int ret; 10484a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10494cb5300bSChris Mason 10504cb5300bSChris Mason path = btrfs_alloc_path(); 10514cb5300bSChris Mason if (!path) 10524cb5300bSChris Mason return -ENOMEM; 10534cb5300bSChris Mason 1054a4689d2bSDavid Sterba min_key.objectid = ino; 10554cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10564cb5300bSChris Mason min_key.offset = *off; 10574cb5300bSChris Mason 10584cb5300bSChris Mason while (1) { 10596174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10604cb5300bSChris Mason if (ret != 0) 10614cb5300bSChris Mason goto none; 1062f094c9bdSFilipe Manana process_slot: 1063a4689d2bSDavid Sterba if (min_key.objectid != ino) 10644cb5300bSChris Mason goto none; 10654cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10664cb5300bSChris Mason goto none; 10674cb5300bSChris Mason 10684cb5300bSChris Mason leaf = path->nodes[0]; 10694cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10704cb5300bSChris Mason struct btrfs_file_extent_item); 10714cb5300bSChris Mason 10724cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10734cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10744cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10754cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10764cb5300bSChris Mason *off = min_key.offset; 10774cb5300bSChris Mason btrfs_free_path(path); 10784cb5300bSChris Mason return 0; 10794cb5300bSChris Mason } 10804cb5300bSChris Mason 1081f094c9bdSFilipe Manana path->slots[0]++; 1082f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1083f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1084f094c9bdSFilipe Manana goto process_slot; 1085f094c9bdSFilipe Manana } 1086f094c9bdSFilipe Manana 10874cb5300bSChris Mason if (min_key.offset == (u64)-1) 10884cb5300bSChris Mason goto none; 10894cb5300bSChris Mason 10904cb5300bSChris Mason min_key.offset++; 10914cb5300bSChris Mason btrfs_release_path(path); 10924cb5300bSChris Mason } 10934cb5300bSChris Mason none: 10944cb5300bSChris Mason btrfs_free_path(path); 10954cb5300bSChris Mason return -ENOENT; 10964cb5300bSChris Mason } 10974cb5300bSChris Mason 10986c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 109917ce6ef8SLiu Bo { 110017ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1101940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11026c282eb4SLi Zefan struct extent_map *em; 110309cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1104940100a4SChris Mason 1105940100a4SChris Mason /* 1106940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1107940100a4SChris Mason * the full extent lock 1108940100a4SChris Mason */ 1109940100a4SChris Mason read_lock(&em_tree->lock); 1110940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1111940100a4SChris Mason read_unlock(&em_tree->lock); 1112940100a4SChris Mason 1113940100a4SChris Mason if (!em) { 1114308d9800SFilipe Manana struct extent_state *cached = NULL; 1115308d9800SFilipe Manana u64 end = start + len - 1; 1116308d9800SFilipe Manana 1117940100a4SChris Mason /* get the big lock and read metadata off disk */ 1118ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 111939b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1120e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1121940100a4SChris Mason 11226cf8bfbfSDan Carpenter if (IS_ERR(em)) 11236c282eb4SLi Zefan return NULL; 1124940100a4SChris Mason } 1125940100a4SChris Mason 11266c282eb4SLi Zefan return em; 11276c282eb4SLi Zefan } 11286c282eb4SLi Zefan 11296c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11306c282eb4SLi Zefan { 11316c282eb4SLi Zefan struct extent_map *next; 11326c282eb4SLi Zefan bool ret = true; 11336c282eb4SLi Zefan 11346c282eb4SLi Zefan /* this is the last extent */ 11356c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11366c282eb4SLi Zefan return false; 11376c282eb4SLi Zefan 11386c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1139e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1140e9512d72SChris Mason ret = false; 1141e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1142ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11436c282eb4SLi Zefan ret = false; 11446c282eb4SLi Zefan 11456c282eb4SLi Zefan free_extent_map(next); 11466c282eb4SLi Zefan return ret; 11476c282eb4SLi Zefan } 11486c282eb4SLi Zefan 1149aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1150a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1151a43a2111SAndrew Mahone int compress) 11526c282eb4SLi Zefan { 11536c282eb4SLi Zefan struct extent_map *em; 11546c282eb4SLi Zefan int ret = 1; 11556c282eb4SLi Zefan bool next_mergeable = true; 11564a3560c4SLiu Bo bool prev_mergeable = true; 11576c282eb4SLi Zefan 11586c282eb4SLi Zefan /* 11596c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11606c282eb4SLi Zefan * defragging it 11616c282eb4SLi Zefan */ 11626c282eb4SLi Zefan if (start < *defrag_end) 11636c282eb4SLi Zefan return 1; 11646c282eb4SLi Zefan 11656c282eb4SLi Zefan *skip = 0; 11666c282eb4SLi Zefan 11676c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11686c282eb4SLi Zefan if (!em) 11696c282eb4SLi Zefan return 0; 11706c282eb4SLi Zefan 1171940100a4SChris Mason /* this will cover holes, and inline extents */ 117217ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1173940100a4SChris Mason ret = 0; 117417ce6ef8SLiu Bo goto out; 117517ce6ef8SLiu Bo } 117617ce6ef8SLiu Bo 11774a3560c4SLiu Bo if (!*defrag_end) 11784a3560c4SLiu Bo prev_mergeable = false; 11794a3560c4SLiu Bo 11806c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1181940100a4SChris Mason /* 11826c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11836c282eb4SLi Zefan * real extent, don't bother defragging it 1184940100a4SChris Mason */ 1185a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11864a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1187940100a4SChris Mason ret = 0; 118817ce6ef8SLiu Bo out: 1189940100a4SChris Mason /* 1190940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1191940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1192940100a4SChris Mason * so that the next tiny extent will force a defrag. 1193940100a4SChris Mason * 1194940100a4SChris Mason * The end result of this is that tiny extents before a single big 1195940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1196940100a4SChris Mason */ 1197940100a4SChris Mason if (ret) { 1198940100a4SChris Mason *defrag_end = extent_map_end(em); 1199940100a4SChris Mason } else { 1200940100a4SChris Mason *last_len = 0; 1201940100a4SChris Mason *skip = extent_map_end(em); 1202940100a4SChris Mason *defrag_end = 0; 1203940100a4SChris Mason } 1204940100a4SChris Mason 1205940100a4SChris Mason free_extent_map(em); 1206940100a4SChris Mason return ret; 1207940100a4SChris Mason } 1208940100a4SChris Mason 12094cb5300bSChris Mason /* 12104cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12114cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12124cb5300bSChris Mason * to COW and defrag. 12134cb5300bSChris Mason * 12144cb5300bSChris Mason * It also makes sure the delalloc code has enough 12154cb5300bSChris Mason * dirty data to avoid making new small extents as part 12164cb5300bSChris Mason * of the defrag 12174cb5300bSChris Mason * 12184cb5300bSChris Mason * It's a good idea to start RA on this range 12194cb5300bSChris Mason * before calling this. 12204cb5300bSChris Mason */ 12214cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12224cb5300bSChris Mason struct page **pages, 12234cb5300bSChris Mason unsigned long start_index, 1224c41570c9SJustin Maggard unsigned long num_pages) 1225f46b5a66SChristoph Hellwig { 12264cb5300bSChris Mason unsigned long file_end; 12274cb5300bSChris Mason u64 isize = i_size_read(inode); 1228f46b5a66SChristoph Hellwig u64 page_start; 1229f46b5a66SChristoph Hellwig u64 page_end; 12301f12bd06SLiu Bo u64 page_cnt; 12314cb5300bSChris Mason int ret; 12324cb5300bSChris Mason int i; 12334cb5300bSChris Mason int i_done; 12344cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12354cb5300bSChris Mason struct extent_state *cached_state = NULL; 1236600a45e1SMiao Xie struct extent_io_tree *tree; 1237364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12383b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12394cb5300bSChris Mason 124009cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12411f12bd06SLiu Bo if (!isize || start_index > file_end) 12421f12bd06SLiu Bo return 0; 12431f12bd06SLiu Bo 12441f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12454cb5300bSChris Mason 1246364ecf36SQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, 124709cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 124809cbfeafSKirill A. Shutemov page_cnt << PAGE_SHIFT); 12494cb5300bSChris Mason if (ret) 12504cb5300bSChris Mason return ret; 12514cb5300bSChris Mason i_done = 0; 1252600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12534cb5300bSChris Mason 12544cb5300bSChris Mason /* step one, lock all the pages */ 12551f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12564cb5300bSChris Mason struct page *page; 1257600a45e1SMiao Xie again: 1258a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12593b16a4e3SJosef Bacik start_index + i, mask); 12604cb5300bSChris Mason if (!page) 12614cb5300bSChris Mason break; 12624cb5300bSChris Mason 1263600a45e1SMiao Xie page_start = page_offset(page); 126409cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1265600a45e1SMiao Xie while (1) { 1266308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1267ff13db41SDavid Sterba &cached_state); 1268600a45e1SMiao Xie ordered = btrfs_lookup_ordered_extent(inode, 1269600a45e1SMiao Xie page_start); 1270308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1271e43bbe5eSDavid Sterba &cached_state); 1272600a45e1SMiao Xie if (!ordered) 1273600a45e1SMiao Xie break; 1274600a45e1SMiao Xie 1275600a45e1SMiao Xie unlock_page(page); 1276600a45e1SMiao Xie btrfs_start_ordered_extent(inode, ordered, 1); 1277600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1278600a45e1SMiao Xie lock_page(page); 12791f12bd06SLiu Bo /* 12801f12bd06SLiu Bo * we unlocked the page above, so we need check if 12811f12bd06SLiu Bo * it was released or not. 12821f12bd06SLiu Bo */ 12831f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12841f12bd06SLiu Bo unlock_page(page); 128509cbfeafSKirill A. Shutemov put_page(page); 12861f12bd06SLiu Bo goto again; 12871f12bd06SLiu Bo } 1288600a45e1SMiao Xie } 1289600a45e1SMiao Xie 12904cb5300bSChris Mason if (!PageUptodate(page)) { 12914cb5300bSChris Mason btrfs_readpage(NULL, page); 12924cb5300bSChris Mason lock_page(page); 12934cb5300bSChris Mason if (!PageUptodate(page)) { 12944cb5300bSChris Mason unlock_page(page); 129509cbfeafSKirill A. Shutemov put_page(page); 12964cb5300bSChris Mason ret = -EIO; 12974cb5300bSChris Mason break; 12984cb5300bSChris Mason } 12994cb5300bSChris Mason } 1300600a45e1SMiao Xie 1301600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1302600a45e1SMiao Xie unlock_page(page); 130309cbfeafSKirill A. Shutemov put_page(page); 1304600a45e1SMiao Xie goto again; 1305600a45e1SMiao Xie } 1306600a45e1SMiao Xie 13074cb5300bSChris Mason pages[i] = page; 13084cb5300bSChris Mason i_done++; 13094cb5300bSChris Mason } 13104cb5300bSChris Mason if (!i_done || ret) 13114cb5300bSChris Mason goto out; 13124cb5300bSChris Mason 13131751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13144cb5300bSChris Mason goto out; 13154cb5300bSChris Mason 13164cb5300bSChris Mason /* 13174cb5300bSChris Mason * so now we have a nice long stream of locked 13184cb5300bSChris Mason * and up to date pages, lets wait on them 13194cb5300bSChris Mason */ 13204cb5300bSChris Mason for (i = 0; i < i_done; i++) 13214cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13224cb5300bSChris Mason 13234cb5300bSChris Mason page_start = page_offset(pages[0]); 132409cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13254cb5300bSChris Mason 13264cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1327ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13284cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1329e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1330e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13314cb5300bSChris Mason 13321f12bd06SLiu Bo if (i_done != page_cnt) { 13339e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 133428c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13359e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 1336bc42bda2SQu Wenruo btrfs_delalloc_release_space(inode, data_reserved, 133709cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 133843b18595SQu Wenruo (page_cnt - i_done) << PAGE_SHIFT, true); 13394cb5300bSChris Mason } 13404cb5300bSChris Mason 13414cb5300bSChris Mason 13429e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1343018ed4f7SDavid Sterba &cached_state); 13444cb5300bSChris Mason 13454cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1346e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13474cb5300bSChris Mason 13484cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13494cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13504cb5300bSChris Mason ClearPageChecked(pages[i]); 13514cb5300bSChris Mason set_page_extent_mapped(pages[i]); 13524cb5300bSChris Mason set_page_dirty(pages[i]); 13534cb5300bSChris Mason unlock_page(pages[i]); 135409cbfeafSKirill A. Shutemov put_page(pages[i]); 13554cb5300bSChris Mason } 13568702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1357364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13584cb5300bSChris Mason return i_done; 13594cb5300bSChris Mason out: 13604cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13614cb5300bSChris Mason unlock_page(pages[i]); 136209cbfeafSKirill A. Shutemov put_page(pages[i]); 13634cb5300bSChris Mason } 1364bc42bda2SQu Wenruo btrfs_delalloc_release_space(inode, data_reserved, 136509cbfeafSKirill A. Shutemov start_index << PAGE_SHIFT, 136643b18595SQu Wenruo page_cnt << PAGE_SHIFT, true); 13678702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1368364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13694cb5300bSChris Mason return ret; 13704cb5300bSChris Mason 13714cb5300bSChris Mason } 13724cb5300bSChris Mason 13734cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 13744cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 13754cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 13764cb5300bSChris Mason { 13770b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13784cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 13794cb5300bSChris Mason struct file_ra_state *ra = NULL; 13804cb5300bSChris Mason unsigned long last_index; 1381151a31b2SLi Zefan u64 isize = i_size_read(inode); 1382940100a4SChris Mason u64 last_len = 0; 1383940100a4SChris Mason u64 skip = 0; 1384940100a4SChris Mason u64 defrag_end = 0; 13854cb5300bSChris Mason u64 newer_off = range->start; 1386f46b5a66SChristoph Hellwig unsigned long i; 1387008873eaSLi Zefan unsigned long ra_index = 0; 1388f46b5a66SChristoph Hellwig int ret; 13894cb5300bSChris Mason int defrag_count = 0; 13901a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1391aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 139209cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1393c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1394ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 13954cb5300bSChris Mason struct page **pages = NULL; 13961e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 13974cb5300bSChris Mason 13980abd5b17SLiu Bo if (isize == 0) 13990abd5b17SLiu Bo return 0; 14000abd5b17SLiu Bo 14010abd5b17SLiu Bo if (range->start >= isize) 14020abd5b17SLiu Bo return -EINVAL; 14031a419d85SLi Zefan 14041e2ef46dSDavid Sterba if (do_compress) { 1405ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14061a419d85SLi Zefan return -EINVAL; 14071a419d85SLi Zefan if (range->compress_type) 14081a419d85SLi Zefan compress_type = range->compress_type; 14091a419d85SLi Zefan } 1410f46b5a66SChristoph Hellwig 14110abd5b17SLiu Bo if (extent_thresh == 0) 1412ee22184bSByongho Lee extent_thresh = SZ_256K; 1413f46b5a66SChristoph Hellwig 14144cb5300bSChris Mason /* 14150a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14160a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14170a52d108SDavid Sterba * we don't error out. 14184cb5300bSChris Mason */ 14194cb5300bSChris Mason if (!file) { 142063e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14210a52d108SDavid Sterba if (ra) 14224cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14234cb5300bSChris Mason } else { 14244cb5300bSChris Mason ra = &file->f_ra; 14254cb5300bSChris Mason } 14264cb5300bSChris Mason 142763e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14284cb5300bSChris Mason if (!pages) { 14294cb5300bSChris Mason ret = -ENOMEM; 14304cb5300bSChris Mason goto out_ra; 14314cb5300bSChris Mason } 14324cb5300bSChris Mason 14334cb5300bSChris Mason /* find the last page to defrag */ 14341e701a32SChris Mason if (range->start + range->len > range->start) { 1435151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 143609cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14371e701a32SChris Mason } else { 143809cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14391e701a32SChris Mason } 14401e701a32SChris Mason 14414cb5300bSChris Mason if (newer_than) { 14424cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1443ee22184bSByongho Lee &newer_off, SZ_64K); 14444cb5300bSChris Mason if (!ret) { 14454cb5300bSChris Mason range->start = newer_off; 14464cb5300bSChris Mason /* 14474cb5300bSChris Mason * we always align our defrag to help keep 14484cb5300bSChris Mason * the extents in the file evenly spaced 14494cb5300bSChris Mason */ 145009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14514cb5300bSChris Mason } else 14524cb5300bSChris Mason goto out_ra; 14534cb5300bSChris Mason } else { 145409cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14554cb5300bSChris Mason } 14564cb5300bSChris Mason if (!max_to_defrag) 1457070034bdSchandan max_to_defrag = last_index - i + 1; 14584cb5300bSChris Mason 14592a0f7f57SLi Zefan /* 14602a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14612a0f7f57SLi Zefan * written sequentially. 14622a0f7f57SLi Zefan */ 14632a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14642a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14652a0f7f57SLi Zefan 1466f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 146709cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 14684cb5300bSChris Mason /* 14694cb5300bSChris Mason * make sure we stop running if someone unmounts 14704cb5300bSChris Mason * the FS 14714cb5300bSChris Mason */ 14721751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14734cb5300bSChris Mason break; 14744cb5300bSChris Mason 14750b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 14760b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1477210549ebSDavid Sterba ret = -EAGAIN; 1478210549ebSDavid Sterba break; 1479210549ebSDavid Sterba } 1480210549ebSDavid Sterba 148109cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 14826c282eb4SLi Zefan extent_thresh, &last_len, &skip, 14831e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1484940100a4SChris Mason unsigned long next; 1485940100a4SChris Mason /* 1486940100a4SChris Mason * the should_defrag function tells us how much to skip 1487940100a4SChris Mason * bump our counter by the suggested amount 1488940100a4SChris Mason */ 148909cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1490940100a4SChris Mason i = max(i + 1, next); 1491940100a4SChris Mason continue; 1492940100a4SChris Mason } 1493008873eaSLi Zefan 1494008873eaSLi Zefan if (!newer_than) { 149509cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 149609cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1497008873eaSLi Zefan cluster = min(cluster, max_cluster); 1498008873eaSLi Zefan } else { 1499008873eaSLi Zefan cluster = max_cluster; 1500008873eaSLi Zefan } 1501008873eaSLi Zefan 1502008873eaSLi Zefan if (i + cluster > ra_index) { 1503008873eaSLi Zefan ra_index = max(i, ra_index); 15040a52d108SDavid Sterba if (ra) 1505d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1506d3c0bab5SDavid Sterba file, ra_index, cluster); 1507e4826a5bSchandan ra_index += cluster; 1508008873eaSLi Zefan } 15094cb5300bSChris Mason 15105955102cSAl Viro inode_lock(inode); 1511eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1512eede2bf3SOmar Sandoval ret = -ETXTBSY; 1513eede2bf3SOmar Sandoval } else { 15141e2ef46dSDavid Sterba if (do_compress) 1515eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1516008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1517eede2bf3SOmar Sandoval } 1518ecb8bea8SLiu Bo if (ret < 0) { 15195955102cSAl Viro inode_unlock(inode); 15204cb5300bSChris Mason goto out_ra; 1521ecb8bea8SLiu Bo } 15224cb5300bSChris Mason 15234cb5300bSChris Mason defrag_count += ret; 1524d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 15255955102cSAl Viro inode_unlock(inode); 15264cb5300bSChris Mason 15274cb5300bSChris Mason if (newer_than) { 15284cb5300bSChris Mason if (newer_off == (u64)-1) 15294cb5300bSChris Mason break; 15304cb5300bSChris Mason 1531e1f041e1SLiu Bo if (ret > 0) 1532e1f041e1SLiu Bo i += ret; 1533e1f041e1SLiu Bo 15344cb5300bSChris Mason newer_off = max(newer_off + 1, 153509cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15364cb5300bSChris Mason 1537ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1538ee22184bSByongho Lee &newer_off, SZ_64K); 15394cb5300bSChris Mason if (!ret) { 15404cb5300bSChris Mason range->start = newer_off; 154109cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15424cb5300bSChris Mason } else { 15434cb5300bSChris Mason break; 1544940100a4SChris Mason } 15454cb5300bSChris Mason } else { 1546008873eaSLi Zefan if (ret > 0) { 1547cbcc8326SLi Zefan i += ret; 154809cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1549008873eaSLi Zefan } else { 1550940100a4SChris Mason i++; 1551008873eaSLi Zefan last_len = 0; 1552008873eaSLi Zefan } 1553f46b5a66SChristoph Hellwig } 15544cb5300bSChris Mason } 1555f46b5a66SChristoph Hellwig 1556dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15571e701a32SChris Mason filemap_flush(inode->i_mapping); 1558dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1559dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1560dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1561dec8ef90SFilipe Manana } 15621e701a32SChris Mason 15631a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15640b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 15655c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 15665c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 15671a419d85SLi Zefan } 15681a419d85SLi Zefan 156960ccf82fSDiego Calleja ret = defrag_count; 1570940100a4SChris Mason 15714cb5300bSChris Mason out_ra: 15721e2ef46dSDavid Sterba if (do_compress) { 15735955102cSAl Viro inode_lock(inode); 1574eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 15755955102cSAl Viro inode_unlock(inode); 1576633085c7SFilipe David Borba Manana } 15774cb5300bSChris Mason if (!file) 15784cb5300bSChris Mason kfree(ra); 15794cb5300bSChris Mason kfree(pages); 1580940100a4SChris Mason return ret; 1581f46b5a66SChristoph Hellwig } 1582f46b5a66SChristoph Hellwig 1583198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 158476dda93cSYan, Zheng void __user *arg) 1585f46b5a66SChristoph Hellwig { 15860b246afaSJeff Mahoney struct inode *inode = file_inode(file); 15870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1588f46b5a66SChristoph Hellwig u64 new_size; 1589f46b5a66SChristoph Hellwig u64 old_size; 1590f46b5a66SChristoph Hellwig u64 devid = 1; 15910b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1592f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1593f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1594f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1595f46b5a66SChristoph Hellwig char *sizestr; 15969a40f122SGui Hecheng char *retptr; 1597f46b5a66SChristoph Hellwig char *devstr = NULL; 1598f46b5a66SChristoph Hellwig int ret = 0; 1599f46b5a66SChristoph Hellwig int mod = 0; 1600f46b5a66SChristoph Hellwig 1601e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1602e441d54dSChris Mason return -EPERM; 1603e441d54dSChris Mason 1604198605a8SMiao Xie ret = mnt_want_write_file(file); 1605198605a8SMiao Xie if (ret) 1606198605a8SMiao Xie return ret; 1607198605a8SMiao Xie 1608171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 160997547676SMiao Xie mnt_drop_write_file(file); 1610e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1611c9e9f97bSIlya Dryomov } 1612c9e9f97bSIlya Dryomov 1613dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1614c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1615c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1616c9e9f97bSIlya Dryomov goto out; 1617c9e9f97bSIlya Dryomov } 16185516e595SMark Fasheh 16195516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1620f46b5a66SChristoph Hellwig 1621f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1622f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1623f46b5a66SChristoph Hellwig if (devstr) { 1624f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1625f46b5a66SChristoph Hellwig *devstr = '\0'; 1626f46b5a66SChristoph Hellwig devstr = vol_args->name; 162758dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 162858dfae63SZhangZhen if (ret) 162958dfae63SZhangZhen goto out_free; 1630dfd79829SMiao Xie if (!devid) { 1631dfd79829SMiao Xie ret = -EINVAL; 1632dfd79829SMiao Xie goto out_free; 1633dfd79829SMiao Xie } 16340b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1635f46b5a66SChristoph Hellwig } 1636dba60f3fSMiao Xie 163709ba3bc9SAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true); 1638f46b5a66SChristoph Hellwig if (!device) { 16390b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1640c1c9ff7cSGeert Uytterhoeven devid); 1641dfd79829SMiao Xie ret = -ENODEV; 1642c9e9f97bSIlya Dryomov goto out_free; 1643f46b5a66SChristoph Hellwig } 1644dba60f3fSMiao Xie 1645ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 16460b246afaSJeff Mahoney btrfs_info(fs_info, 1647efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1648c1c9ff7cSGeert Uytterhoeven devid); 1649dfd79829SMiao Xie ret = -EPERM; 16504e42ae1bSLiu Bo goto out_free; 16514e42ae1bSLiu Bo } 16524e42ae1bSLiu Bo 1653f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1654f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1655f46b5a66SChristoph Hellwig else { 1656f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1657f46b5a66SChristoph Hellwig mod = -1; 1658f46b5a66SChristoph Hellwig sizestr++; 1659f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1660f46b5a66SChristoph Hellwig mod = 1; 1661f46b5a66SChristoph Hellwig sizestr++; 1662f46b5a66SChristoph Hellwig } 16639a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 16649a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1665f46b5a66SChristoph Hellwig ret = -EINVAL; 1666c9e9f97bSIlya Dryomov goto out_free; 1667f46b5a66SChristoph Hellwig } 1668f46b5a66SChristoph Hellwig } 1669f46b5a66SChristoph Hellwig 1670401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1671dfd79829SMiao Xie ret = -EPERM; 167263a212abSStefan Behrens goto out_free; 167363a212abSStefan Behrens } 167463a212abSStefan Behrens 16757cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1676f46b5a66SChristoph Hellwig 1677f46b5a66SChristoph Hellwig if (mod < 0) { 1678f46b5a66SChristoph Hellwig if (new_size > old_size) { 1679f46b5a66SChristoph Hellwig ret = -EINVAL; 1680c9e9f97bSIlya Dryomov goto out_free; 1681f46b5a66SChristoph Hellwig } 1682f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1683f46b5a66SChristoph Hellwig } else if (mod > 0) { 1684eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1685902c68a4SGui Hecheng ret = -ERANGE; 1686eb8052e0SWenliang Fan goto out_free; 1687eb8052e0SWenliang Fan } 1688f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1689f46b5a66SChristoph Hellwig } 1690f46b5a66SChristoph Hellwig 1691ee22184bSByongho Lee if (new_size < SZ_256M) { 1692f46b5a66SChristoph Hellwig ret = -EINVAL; 1693c9e9f97bSIlya Dryomov goto out_free; 1694f46b5a66SChristoph Hellwig } 1695f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1696f46b5a66SChristoph Hellwig ret = -EFBIG; 1697c9e9f97bSIlya Dryomov goto out_free; 1698f46b5a66SChristoph Hellwig } 1699f46b5a66SChristoph Hellwig 170047f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1701f46b5a66SChristoph Hellwig 1702f46b5a66SChristoph Hellwig if (new_size > old_size) { 1703a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 170498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 170598d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1706c9e9f97bSIlya Dryomov goto out_free; 170798d5dc13STsutomu Itoh } 1708f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17093a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1710ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1711f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17120253f40eSjeff.liu } /* equal, nothing need to do */ 1713f46b5a66SChristoph Hellwig 1714faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1715faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1716faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1717faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1718faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1719c9e9f97bSIlya Dryomov out_free: 1720f46b5a66SChristoph Hellwig kfree(vol_args); 1721c9e9f97bSIlya Dryomov out: 1722171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 172318f39c41SIlya Dryomov mnt_drop_write_file(file); 1724f46b5a66SChristoph Hellwig return ret; 1725f46b5a66SChristoph Hellwig } 1726f46b5a66SChristoph Hellwig 17275d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 172852f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 17295d54c67eSNikolay Borisov bool readonly, 17308696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1731f46b5a66SChristoph Hellwig { 1732f46b5a66SChristoph Hellwig int namelen; 17333de4586cSChris Mason int ret = 0; 1734f46b5a66SChristoph Hellwig 1735325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1736325c50e3SJeff Mahoney return -ENOTDIR; 1737325c50e3SJeff Mahoney 1738a874a63eSLiu Bo ret = mnt_want_write_file(file); 1739a874a63eSLiu Bo if (ret) 1740a874a63eSLiu Bo goto out; 1741a874a63eSLiu Bo 174272fd032eSSage Weil namelen = strlen(name); 174372fd032eSSage Weil if (strchr(name, '/')) { 1744f46b5a66SChristoph Hellwig ret = -EINVAL; 1745a874a63eSLiu Bo goto out_drop_write; 1746f46b5a66SChristoph Hellwig } 1747f46b5a66SChristoph Hellwig 174816780cabSChris Mason if (name[0] == '.' && 174916780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 175016780cabSChris Mason ret = -EEXIST; 1751a874a63eSLiu Bo goto out_drop_write; 175216780cabSChris Mason } 175316780cabSChris Mason 17543de4586cSChris Mason if (subvol) { 175572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 17565d54c67eSNikolay Borisov NULL, readonly, inherit); 1757cb8e7090SChristoph Hellwig } else { 17582903ff01SAl Viro struct fd src = fdget(fd); 17593de4586cSChris Mason struct inode *src_inode; 17602903ff01SAl Viro if (!src.file) { 17613de4586cSChris Mason ret = -EINVAL; 1762a874a63eSLiu Bo goto out_drop_write; 17633de4586cSChris Mason } 17643de4586cSChris Mason 1765496ad9aaSAl Viro src_inode = file_inode(src.file); 1766496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1767c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1768efe120a0SFrank Holton "Snapshot src from another FS"); 176923ad5b17SKusanagi Kouichi ret = -EXDEV; 1770d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1771d0242061SDavid Sterba /* 1772d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1773d0242061SDavid Sterba * are limited to own subvolumes only 1774d0242061SDavid Sterba */ 1775d0242061SDavid Sterba ret = -EPERM; 1776ecd18815SAl Viro } else { 1777c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 177872fd032eSSage Weil BTRFS_I(src_inode)->root, 17795d54c67eSNikolay Borisov readonly, inherit); 1780ecd18815SAl Viro } 17812903ff01SAl Viro fdput(src); 1782cb8e7090SChristoph Hellwig } 1783a874a63eSLiu Bo out_drop_write: 1784a874a63eSLiu Bo mnt_drop_write_file(file); 1785f46b5a66SChristoph Hellwig out: 178672fd032eSSage Weil return ret; 178772fd032eSSage Weil } 178872fd032eSSage Weil 178972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1790fa0d2b9bSLi Zefan void __user *arg, int subvol) 179172fd032eSSage Weil { 1792fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 179372fd032eSSage Weil int ret; 179472fd032eSSage Weil 1795325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1796325c50e3SJeff Mahoney return -ENOTDIR; 1797325c50e3SJeff Mahoney 1798fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1799fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1800fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1801fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1802fa0d2b9bSLi Zefan 18035d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18045d54c67eSNikolay Borisov subvol, false, NULL); 1805fa0d2b9bSLi Zefan 1806fa0d2b9bSLi Zefan kfree(vol_args); 1807fa0d2b9bSLi Zefan return ret; 1808fa0d2b9bSLi Zefan } 1809fa0d2b9bSLi Zefan 1810fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1811fa0d2b9bSLi Zefan void __user *arg, int subvol) 1812fa0d2b9bSLi Zefan { 1813fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1814fa0d2b9bSLi Zefan int ret; 1815b83cc969SLi Zefan bool readonly = false; 18166f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 181772fd032eSSage Weil 1818325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1819325c50e3SJeff Mahoney return -ENOTDIR; 1820325c50e3SJeff Mahoney 1821fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1822fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1823fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1824fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1825fdfb1e4fSLi Zefan 1826673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1827b83cc969SLi Zefan ret = -EOPNOTSUPP; 1828c47ca32dSDan Carpenter goto free_args; 1829fdfb1e4fSLi Zefan } 1830fdfb1e4fSLi Zefan 1831b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1832b83cc969SLi Zefan readonly = true; 18336f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 183409cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 18356f72c7e2SArne Jansen ret = -EINVAL; 1836c47ca32dSDan Carpenter goto free_args; 18376f72c7e2SArne Jansen } 18386f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 18396f72c7e2SArne Jansen if (IS_ERR(inherit)) { 18406f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1841c47ca32dSDan Carpenter goto free_args; 18426f72c7e2SArne Jansen } 18436f72c7e2SArne Jansen } 184475eaa0e2SSage Weil 18455d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18465d54c67eSNikolay Borisov subvol, readonly, inherit); 1847c47ca32dSDan Carpenter if (ret) 1848c47ca32dSDan Carpenter goto free_inherit; 1849c47ca32dSDan Carpenter free_inherit: 18506f72c7e2SArne Jansen kfree(inherit); 1851c47ca32dSDan Carpenter free_args: 1852c47ca32dSDan Carpenter kfree(vol_args); 1853f46b5a66SChristoph Hellwig return ret; 1854f46b5a66SChristoph Hellwig } 1855f46b5a66SChristoph Hellwig 18560caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 18570caa102dSLi Zefan void __user *arg) 18580caa102dSLi Zefan { 1859496ad9aaSAl Viro struct inode *inode = file_inode(file); 18600b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18610caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18620caa102dSLi Zefan int ret = 0; 18630caa102dSLi Zefan u64 flags = 0; 18640caa102dSLi Zefan 18654a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 18660caa102dSLi Zefan return -EINVAL; 18670caa102dSLi Zefan 18680b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 18690caa102dSLi Zefan if (btrfs_root_readonly(root)) 18700caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 18710b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 18720caa102dSLi Zefan 18730caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 18740caa102dSLi Zefan ret = -EFAULT; 18750caa102dSLi Zefan 18760caa102dSLi Zefan return ret; 18770caa102dSLi Zefan } 18780caa102dSLi Zefan 18790caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 18800caa102dSLi Zefan void __user *arg) 18810caa102dSLi Zefan { 1882496ad9aaSAl Viro struct inode *inode = file_inode(file); 18830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18840caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 18850caa102dSLi Zefan struct btrfs_trans_handle *trans; 18860caa102dSLi Zefan u64 root_flags; 18870caa102dSLi Zefan u64 flags; 18880caa102dSLi Zefan int ret = 0; 18890caa102dSLi Zefan 1890bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1891bd60ea0fSDavid Sterba return -EPERM; 1892bd60ea0fSDavid Sterba 1893b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1894b9ca0664SLiu Bo if (ret) 1895b9ca0664SLiu Bo goto out; 18960caa102dSLi Zefan 18974a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1898b9ca0664SLiu Bo ret = -EINVAL; 1899b9ca0664SLiu Bo goto out_drop_write; 1900b9ca0664SLiu Bo } 19010caa102dSLi Zefan 1902b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1903b9ca0664SLiu Bo ret = -EFAULT; 1904b9ca0664SLiu Bo goto out_drop_write; 1905b9ca0664SLiu Bo } 19060caa102dSLi Zefan 1907b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1908b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1909b9ca0664SLiu Bo goto out_drop_write; 1910b9ca0664SLiu Bo } 19110caa102dSLi Zefan 19120b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 19130caa102dSLi Zefan 19140caa102dSLi Zefan /* nothing to do */ 19150caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1916b9ca0664SLiu Bo goto out_drop_sem; 19170caa102dSLi Zefan 19180caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 19192c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 19200caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19210caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 19222c686537SDavid Sterba } else { 19232c686537SDavid Sterba /* 19242c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 19252c686537SDavid Sterba * send 19262c686537SDavid Sterba */ 19272c686537SDavid Sterba spin_lock(&root->root_item_lock); 19282c686537SDavid Sterba if (root->send_in_progress == 0) { 19290caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 19300caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 19312c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19322c686537SDavid Sterba } else { 19332c686537SDavid Sterba spin_unlock(&root->root_item_lock); 19340b246afaSJeff Mahoney btrfs_warn(fs_info, 19352c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 19362c686537SDavid Sterba root->root_key.objectid); 19372c686537SDavid Sterba ret = -EPERM; 19382c686537SDavid Sterba goto out_drop_sem; 19392c686537SDavid Sterba } 19402c686537SDavid Sterba } 19410caa102dSLi Zefan 19420caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 19430caa102dSLi Zefan if (IS_ERR(trans)) { 19440caa102dSLi Zefan ret = PTR_ERR(trans); 19450caa102dSLi Zefan goto out_reset; 19460caa102dSLi Zefan } 19470caa102dSLi Zefan 19480b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 19490caa102dSLi Zefan &root->root_key, &root->root_item); 19509417ebc8SNikolay Borisov if (ret < 0) { 19519417ebc8SNikolay Borisov btrfs_end_transaction(trans); 19529417ebc8SNikolay Borisov goto out_reset; 19539417ebc8SNikolay Borisov } 19540caa102dSLi Zefan 19559417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 19569417ebc8SNikolay Borisov 19570caa102dSLi Zefan out_reset: 19580caa102dSLi Zefan if (ret) 19590caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1960b9ca0664SLiu Bo out_drop_sem: 19610b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1962b9ca0664SLiu Bo out_drop_write: 1963b9ca0664SLiu Bo mnt_drop_write_file(file); 1964b9ca0664SLiu Bo out: 19650caa102dSLi Zefan return ret; 19660caa102dSLi Zefan } 19670caa102dSLi Zefan 1968ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1969ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1970ac8e9819SChris Mason { 1971abc6e134SChris Mason struct btrfs_key test; 1972abc6e134SChris Mason int ret; 1973abc6e134SChris Mason 1974abc6e134SChris Mason test.objectid = sk->min_objectid; 1975abc6e134SChris Mason test.type = sk->min_type; 1976abc6e134SChris Mason test.offset = sk->min_offset; 1977abc6e134SChris Mason 1978abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1979abc6e134SChris Mason if (ret < 0) 1980ac8e9819SChris Mason return 0; 1981abc6e134SChris Mason 1982abc6e134SChris Mason test.objectid = sk->max_objectid; 1983abc6e134SChris Mason test.type = sk->max_type; 1984abc6e134SChris Mason test.offset = sk->max_offset; 1985abc6e134SChris Mason 1986abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1987abc6e134SChris Mason if (ret > 0) 1988ac8e9819SChris Mason return 0; 1989ac8e9819SChris Mason return 1; 1990ac8e9819SChris Mason } 1991ac8e9819SChris Mason 1992df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1993ac8e9819SChris Mason struct btrfs_key *key, 1994ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 19959b6e817dSGerhard Heift size_t *buf_size, 1996ba346b35SGerhard Heift char __user *ubuf, 1997ac8e9819SChris Mason unsigned long *sk_offset, 1998ac8e9819SChris Mason int *num_found) 1999ac8e9819SChris Mason { 2000ac8e9819SChris Mason u64 found_transid; 2001ac8e9819SChris Mason struct extent_buffer *leaf; 2002ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2003dd81d459SNaohiro Aota struct btrfs_key test; 2004ac8e9819SChris Mason unsigned long item_off; 2005ac8e9819SChris Mason unsigned long item_len; 2006ac8e9819SChris Mason int nritems; 2007ac8e9819SChris Mason int i; 2008ac8e9819SChris Mason int slot; 2009ac8e9819SChris Mason int ret = 0; 2010ac8e9819SChris Mason 2011ac8e9819SChris Mason leaf = path->nodes[0]; 2012ac8e9819SChris Mason slot = path->slots[0]; 2013ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2014ac8e9819SChris Mason 2015ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2016ac8e9819SChris Mason i = nritems; 2017ac8e9819SChris Mason goto advance_key; 2018ac8e9819SChris Mason } 2019ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2020ac8e9819SChris Mason 2021ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2022ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2023ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2024ac8e9819SChris Mason 202503b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 202603b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 202703b71c6cSGabriel de Perthuis continue; 202803b71c6cSGabriel de Perthuis 20299b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 20308f5f6178SGerhard Heift if (*num_found) { 2031ac8e9819SChris Mason ret = 1; 20328f5f6178SGerhard Heift goto out; 20338f5f6178SGerhard Heift } 20348f5f6178SGerhard Heift 20358f5f6178SGerhard Heift /* 20368f5f6178SGerhard Heift * return one empty item back for v1, which does not 20378f5f6178SGerhard Heift * handle -EOVERFLOW 20388f5f6178SGerhard Heift */ 20398f5f6178SGerhard Heift 20409b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2041ac8e9819SChris Mason item_len = 0; 20428f5f6178SGerhard Heift ret = -EOVERFLOW; 20438f5f6178SGerhard Heift } 2044ac8e9819SChris Mason 20459b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2046ac8e9819SChris Mason ret = 1; 204725c9bc2eSGerhard Heift goto out; 2048ac8e9819SChris Mason } 2049ac8e9819SChris Mason 2050ac8e9819SChris Mason sh.objectid = key->objectid; 2051ac8e9819SChris Mason sh.offset = key->offset; 2052ac8e9819SChris Mason sh.type = key->type; 2053ac8e9819SChris Mason sh.len = item_len; 2054ac8e9819SChris Mason sh.transid = found_transid; 2055ac8e9819SChris Mason 2056ac8e9819SChris Mason /* copy search result header */ 2057ba346b35SGerhard Heift if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { 2058ba346b35SGerhard Heift ret = -EFAULT; 2059ba346b35SGerhard Heift goto out; 2060ba346b35SGerhard Heift } 2061ba346b35SGerhard Heift 2062ac8e9819SChris Mason *sk_offset += sizeof(sh); 2063ac8e9819SChris Mason 2064ac8e9819SChris Mason if (item_len) { 2065ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2066ac8e9819SChris Mason /* copy the item */ 2067ba346b35SGerhard Heift if (read_extent_buffer_to_user(leaf, up, 2068ba346b35SGerhard Heift item_off, item_len)) { 2069ba346b35SGerhard Heift ret = -EFAULT; 2070ba346b35SGerhard Heift goto out; 2071ba346b35SGerhard Heift } 2072ba346b35SGerhard Heift 2073ac8e9819SChris Mason *sk_offset += item_len; 2074ac8e9819SChris Mason } 2075e2156867SHugo Mills (*num_found)++; 2076ac8e9819SChris Mason 20778f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 20788f5f6178SGerhard Heift goto out; 20798f5f6178SGerhard Heift 208025c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 208125c9bc2eSGerhard Heift ret = 1; 208225c9bc2eSGerhard Heift goto out; 208325c9bc2eSGerhard Heift } 2084ac8e9819SChris Mason } 2085ac8e9819SChris Mason advance_key: 2086ac8e9819SChris Mason ret = 0; 2087dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2088dd81d459SNaohiro Aota test.type = sk->max_type; 2089dd81d459SNaohiro Aota test.offset = sk->max_offset; 2090dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2091dd81d459SNaohiro Aota ret = 1; 2092dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2093abc6e134SChris Mason key->offset++; 2094dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2095abc6e134SChris Mason key->offset = 0; 2096abc6e134SChris Mason key->type++; 2097dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2098abc6e134SChris Mason key->offset = 0; 2099abc6e134SChris Mason key->type = 0; 2100abc6e134SChris Mason key->objectid++; 2101abc6e134SChris Mason } else 2102abc6e134SChris Mason ret = 1; 210325c9bc2eSGerhard Heift out: 2104ba346b35SGerhard Heift /* 2105ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2106ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2107ba346b35SGerhard Heift * * all items were found 2108ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2109ba346b35SGerhard Heift * leaf 2110ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2111ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2112ba346b35SGerhard Heift */ 2113ac8e9819SChris Mason return ret; 2114ac8e9819SChris Mason } 2115ac8e9819SChris Mason 2116ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 211712544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 21189b6e817dSGerhard Heift size_t *buf_size, 2119ba346b35SGerhard Heift char __user *ubuf) 2120ac8e9819SChris Mason { 21210b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2122ac8e9819SChris Mason struct btrfs_root *root; 2123ac8e9819SChris Mason struct btrfs_key key; 2124ac8e9819SChris Mason struct btrfs_path *path; 2125ac8e9819SChris Mason int ret; 2126ac8e9819SChris Mason int num_found = 0; 2127ac8e9819SChris Mason unsigned long sk_offset = 0; 2128ac8e9819SChris Mason 21299b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 21309b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 213112544442SGerhard Heift return -EOVERFLOW; 21329b6e817dSGerhard Heift } 213312544442SGerhard Heift 2134ac8e9819SChris Mason path = btrfs_alloc_path(); 2135ac8e9819SChris Mason if (!path) 2136ac8e9819SChris Mason return -ENOMEM; 2137ac8e9819SChris Mason 2138ac8e9819SChris Mason if (sk->tree_id == 0) { 2139ac8e9819SChris Mason /* search the root of the inode that was passed */ 214000246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2141ac8e9819SChris Mason } else { 2142ac8e9819SChris Mason key.objectid = sk->tree_id; 2143ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 2144ac8e9819SChris Mason key.offset = (u64)-1; 21453619c94fSJosef Bacik root = btrfs_get_fs_root(info, &key, true); 2146ac8e9819SChris Mason if (IS_ERR(root)) { 2147ac8e9819SChris Mason btrfs_free_path(path); 2148ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2149ac8e9819SChris Mason } 2150ac8e9819SChris Mason } 2151ac8e9819SChris Mason 2152ac8e9819SChris Mason key.objectid = sk->min_objectid; 2153ac8e9819SChris Mason key.type = sk->min_type; 2154ac8e9819SChris Mason key.offset = sk->min_offset; 2155ac8e9819SChris Mason 2156ac8e9819SChris Mason while (1) { 21576174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2158ac8e9819SChris Mason if (ret != 0) { 2159ac8e9819SChris Mason if (ret > 0) 2160ac8e9819SChris Mason ret = 0; 2161ac8e9819SChris Mason goto err; 2162ac8e9819SChris Mason } 2163df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2164ac8e9819SChris Mason &sk_offset, &num_found); 2165b3b4aa74SDavid Sterba btrfs_release_path(path); 216625c9bc2eSGerhard Heift if (ret) 2167ac8e9819SChris Mason break; 2168ac8e9819SChris Mason 2169ac8e9819SChris Mason } 21708f5f6178SGerhard Heift if (ret > 0) 2171ac8e9819SChris Mason ret = 0; 2172ac8e9819SChris Mason err: 2173ac8e9819SChris Mason sk->nr_items = num_found; 217400246528SJosef Bacik btrfs_put_root(root); 2175ac8e9819SChris Mason btrfs_free_path(path); 2176ac8e9819SChris Mason return ret; 2177ac8e9819SChris Mason } 2178ac8e9819SChris Mason 2179ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2180ac8e9819SChris Mason void __user *argp) 2181ac8e9819SChris Mason { 2182ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2183ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2184ac8e9819SChris Mason struct inode *inode; 2185ac8e9819SChris Mason int ret; 21869b6e817dSGerhard Heift size_t buf_size; 2187ac8e9819SChris Mason 2188ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2189ac8e9819SChris Mason return -EPERM; 2190ac8e9819SChris Mason 2191ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2192ac8e9819SChris Mason 2193ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2194ba346b35SGerhard Heift return -EFAULT; 2195ba346b35SGerhard Heift 2196ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2197ac8e9819SChris Mason 2198496ad9aaSAl Viro inode = file_inode(file); 2199ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 22008f5f6178SGerhard Heift 22018f5f6178SGerhard Heift /* 22028f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 22038f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 22048f5f6178SGerhard Heift */ 22058f5f6178SGerhard Heift if (ret == -EOVERFLOW) 22068f5f6178SGerhard Heift ret = 0; 22078f5f6178SGerhard Heift 2208ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2209ac8e9819SChris Mason ret = -EFAULT; 2210ac8e9819SChris Mason return ret; 2211ac8e9819SChris Mason } 2212ac8e9819SChris Mason 2213cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2214cc68a8a5SGerhard Heift void __user *argp) 2215cc68a8a5SGerhard Heift { 2216cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2217cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2218cc68a8a5SGerhard Heift struct inode *inode; 2219cc68a8a5SGerhard Heift int ret; 2220cc68a8a5SGerhard Heift size_t buf_size; 2221ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2222cc68a8a5SGerhard Heift 2223cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2224cc68a8a5SGerhard Heift return -EPERM; 2225cc68a8a5SGerhard Heift 2226cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2227cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2228cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2229cc68a8a5SGerhard Heift return -EFAULT; 2230cc68a8a5SGerhard Heift 2231cc68a8a5SGerhard Heift buf_size = args.buf_size; 2232cc68a8a5SGerhard Heift 2233cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2234cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2235cc68a8a5SGerhard Heift buf_size = buf_limit; 2236cc68a8a5SGerhard Heift 2237cc68a8a5SGerhard Heift inode = file_inode(file); 2238cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2239718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2240cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2241cc68a8a5SGerhard Heift ret = -EFAULT; 2242cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2243cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2244cc68a8a5SGerhard Heift ret = -EFAULT; 2245cc68a8a5SGerhard Heift 224676dda93cSYan, Zheng return ret; 224776dda93cSYan, Zheng } 224876dda93cSYan, Zheng 224998d377a0STARUISI Hiroaki /* 2250ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2251ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 225298d377a0STARUISI Hiroaki */ 225398d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 225498d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 225598d377a0STARUISI Hiroaki { 225698d377a0STARUISI Hiroaki struct btrfs_root *root; 225798d377a0STARUISI Hiroaki struct btrfs_key key; 2258ac8e9819SChris Mason char *ptr; 225998d377a0STARUISI Hiroaki int ret = -1; 226098d377a0STARUISI Hiroaki int slot; 226198d377a0STARUISI Hiroaki int len; 226298d377a0STARUISI Hiroaki int total_len = 0; 226398d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 226498d377a0STARUISI Hiroaki struct extent_buffer *l; 226598d377a0STARUISI Hiroaki struct btrfs_path *path; 226698d377a0STARUISI Hiroaki 226798d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 226898d377a0STARUISI Hiroaki name[0]='\0'; 226998d377a0STARUISI Hiroaki return 0; 227098d377a0STARUISI Hiroaki } 227198d377a0STARUISI Hiroaki 227298d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 227398d377a0STARUISI Hiroaki if (!path) 227498d377a0STARUISI Hiroaki return -ENOMEM; 227598d377a0STARUISI Hiroaki 2276c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 227798d377a0STARUISI Hiroaki 227898d377a0STARUISI Hiroaki key.objectid = tree_id; 227998d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 228098d377a0STARUISI Hiroaki key.offset = (u64)-1; 22813619c94fSJosef Bacik root = btrfs_get_fs_root(info, &key, true); 228298d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2283ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 228488234012SJosef Bacik root = NULL; 228588234012SJosef Bacik goto out; 228688234012SJosef Bacik } 228798d377a0STARUISI Hiroaki 228898d377a0STARUISI Hiroaki key.objectid = dirid; 228998d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 22908ad6fcabSChris Mason key.offset = (u64)-1; 229198d377a0STARUISI Hiroaki 229298d377a0STARUISI Hiroaki while (1) { 229398d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 229498d377a0STARUISI Hiroaki if (ret < 0) 229598d377a0STARUISI Hiroaki goto out; 229618674c6cSFilipe David Borba Manana else if (ret > 0) { 229718674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 229818674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 229918674c6cSFilipe David Borba Manana if (ret < 0) 230018674c6cSFilipe David Borba Manana goto out; 230118674c6cSFilipe David Borba Manana else if (ret > 0) { 2302ac8e9819SChris Mason ret = -ENOENT; 230398d377a0STARUISI Hiroaki goto out; 2304ac8e9819SChris Mason } 230518674c6cSFilipe David Borba Manana } 230618674c6cSFilipe David Borba Manana 230718674c6cSFilipe David Borba Manana l = path->nodes[0]; 230818674c6cSFilipe David Borba Manana slot = path->slots[0]; 230918674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 231098d377a0STARUISI Hiroaki 231198d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 231298d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 231398d377a0STARUISI Hiroaki ptr -= len + 1; 231498d377a0STARUISI Hiroaki total_len += len + 1; 2315a696cf35SFilipe David Borba Manana if (ptr < name) { 2316a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 231798d377a0STARUISI Hiroaki goto out; 2318a696cf35SFilipe David Borba Manana } 231998d377a0STARUISI Hiroaki 232098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 232198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 232298d377a0STARUISI Hiroaki 232398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 232498d377a0STARUISI Hiroaki break; 232598d377a0STARUISI Hiroaki 2326b3b4aa74SDavid Sterba btrfs_release_path(path); 232798d377a0STARUISI Hiroaki key.objectid = key.offset; 23288ad6fcabSChris Mason key.offset = (u64)-1; 232998d377a0STARUISI Hiroaki dirid = key.objectid; 233098d377a0STARUISI Hiroaki } 233177906a50SLi Zefan memmove(name, ptr, total_len); 233298d377a0STARUISI Hiroaki name[total_len] = '\0'; 233398d377a0STARUISI Hiroaki ret = 0; 233498d377a0STARUISI Hiroaki out: 233500246528SJosef Bacik btrfs_put_root(root); 233698d377a0STARUISI Hiroaki btrfs_free_path(path); 2337ac8e9819SChris Mason return ret; 2338ac8e9819SChris Mason } 2339ac8e9819SChris Mason 234023d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 234123d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 234223d0b79dSTomohiro Misono { 234323d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 234423d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 234523d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 234623d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 234723d0b79dSTomohiro Misono u64 dirid = args->dirid; 234823d0b79dSTomohiro Misono unsigned long item_off; 234923d0b79dSTomohiro Misono unsigned long item_len; 235023d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 235123d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2352b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 235323d0b79dSTomohiro Misono struct btrfs_path *path; 235423d0b79dSTomohiro Misono struct btrfs_key key, key2; 235523d0b79dSTomohiro Misono struct extent_buffer *leaf; 235623d0b79dSTomohiro Misono struct inode *temp_inode; 235723d0b79dSTomohiro Misono char *ptr; 235823d0b79dSTomohiro Misono int slot; 235923d0b79dSTomohiro Misono int len; 236023d0b79dSTomohiro Misono int total_len = 0; 236123d0b79dSTomohiro Misono int ret; 236223d0b79dSTomohiro Misono 236323d0b79dSTomohiro Misono path = btrfs_alloc_path(); 236423d0b79dSTomohiro Misono if (!path) 236523d0b79dSTomohiro Misono return -ENOMEM; 236623d0b79dSTomohiro Misono 236723d0b79dSTomohiro Misono /* 236823d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 236923d0b79dSTomohiro Misono * construct the path in from the bottom up. 237023d0b79dSTomohiro Misono */ 237123d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 237223d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 237323d0b79dSTomohiro Misono 237423d0b79dSTomohiro Misono key.objectid = treeid; 237523d0b79dSTomohiro Misono key.type = BTRFS_ROOT_ITEM_KEY; 237623d0b79dSTomohiro Misono key.offset = (u64)-1; 23773619c94fSJosef Bacik root = btrfs_get_fs_root(fs_info, &key, true); 237823d0b79dSTomohiro Misono if (IS_ERR(root)) { 237923d0b79dSTomohiro Misono ret = PTR_ERR(root); 238023d0b79dSTomohiro Misono goto out; 238123d0b79dSTomohiro Misono } 238223d0b79dSTomohiro Misono 238323d0b79dSTomohiro Misono key.objectid = dirid; 238423d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 238523d0b79dSTomohiro Misono key.offset = (u64)-1; 238623d0b79dSTomohiro Misono while (1) { 238723d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 238823d0b79dSTomohiro Misono if (ret < 0) { 2389b8a49ae1SJosef Bacik goto out_put; 239023d0b79dSTomohiro Misono } else if (ret > 0) { 239123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 239223d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 239323d0b79dSTomohiro Misono if (ret < 0) { 2394b8a49ae1SJosef Bacik goto out_put; 239523d0b79dSTomohiro Misono } else if (ret > 0) { 239623d0b79dSTomohiro Misono ret = -ENOENT; 2397b8a49ae1SJosef Bacik goto out_put; 239823d0b79dSTomohiro Misono } 239923d0b79dSTomohiro Misono } 240023d0b79dSTomohiro Misono 240123d0b79dSTomohiro Misono leaf = path->nodes[0]; 240223d0b79dSTomohiro Misono slot = path->slots[0]; 240323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 240423d0b79dSTomohiro Misono 240523d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 240623d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 240723d0b79dSTomohiro Misono ptr -= len + 1; 240823d0b79dSTomohiro Misono total_len += len + 1; 240923d0b79dSTomohiro Misono if (ptr < args->path) { 241023d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2411b8a49ae1SJosef Bacik goto out_put; 241223d0b79dSTomohiro Misono } 241323d0b79dSTomohiro Misono 241423d0b79dSTomohiro Misono *(ptr + len) = '/'; 241523d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 241623d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 241723d0b79dSTomohiro Misono 241823d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 241923d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 242023d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 242123d0b79dSTomohiro Misono if (ret < 0) { 2422b8a49ae1SJosef Bacik goto out_put; 242323d0b79dSTomohiro Misono } else if (ret > 0) { 242423d0b79dSTomohiro Misono ret = -ENOENT; 2425b8a49ae1SJosef Bacik goto out_put; 242623d0b79dSTomohiro Misono } 242723d0b79dSTomohiro Misono 242823d0b79dSTomohiro Misono leaf = path->nodes[0]; 242923d0b79dSTomohiro Misono slot = path->slots[0]; 243023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 243123d0b79dSTomohiro Misono if (key2.objectid != dirid) { 243223d0b79dSTomohiro Misono ret = -ENOENT; 2433b8a49ae1SJosef Bacik goto out_put; 243423d0b79dSTomohiro Misono } 243523d0b79dSTomohiro Misono 24364c66e0d4SDavid Sterba temp_inode = btrfs_iget(sb, &key2, root); 24373ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 24383ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2439b8a49ae1SJosef Bacik goto out_put; 24403ca57bd6SMisono Tomohiro } 244123d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 244223d0b79dSTomohiro Misono iput(temp_inode); 244323d0b79dSTomohiro Misono if (ret) { 244423d0b79dSTomohiro Misono ret = -EACCES; 2445b8a49ae1SJosef Bacik goto out_put; 244623d0b79dSTomohiro Misono } 244723d0b79dSTomohiro Misono 244823d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 244923d0b79dSTomohiro Misono break; 245023d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 245123d0b79dSTomohiro Misono ret = -EACCES; 2452b8a49ae1SJosef Bacik goto out_put; 245323d0b79dSTomohiro Misono } 245423d0b79dSTomohiro Misono 245523d0b79dSTomohiro Misono btrfs_release_path(path); 245623d0b79dSTomohiro Misono key.objectid = key.offset; 245723d0b79dSTomohiro Misono key.offset = (u64)-1; 245823d0b79dSTomohiro Misono dirid = key.objectid; 245923d0b79dSTomohiro Misono } 246023d0b79dSTomohiro Misono 246123d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 246223d0b79dSTomohiro Misono args->path[total_len] = '\0'; 246300246528SJosef Bacik btrfs_put_root(root); 2464b8a49ae1SJosef Bacik root = NULL; 246523d0b79dSTomohiro Misono btrfs_release_path(path); 246623d0b79dSTomohiro Misono } 246723d0b79dSTomohiro Misono 246823d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 246923d0b79dSTomohiro Misono key.objectid = treeid; 247023d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 247123d0b79dSTomohiro Misono key.offset = args->treeid; 2472b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 247323d0b79dSTomohiro Misono if (ret < 0) { 247423d0b79dSTomohiro Misono goto out; 247523d0b79dSTomohiro Misono } else if (ret > 0) { 247623d0b79dSTomohiro Misono ret = -ENOENT; 247723d0b79dSTomohiro Misono goto out; 247823d0b79dSTomohiro Misono } 247923d0b79dSTomohiro Misono 248023d0b79dSTomohiro Misono leaf = path->nodes[0]; 248123d0b79dSTomohiro Misono slot = path->slots[0]; 248223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 248323d0b79dSTomohiro Misono 248423d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 248523d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 248623d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 248723d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 248823d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 248923d0b79dSTomohiro Misono ret = -EINVAL; 249023d0b79dSTomohiro Misono goto out; 249123d0b79dSTomohiro Misono } 249223d0b79dSTomohiro Misono 249323d0b79dSTomohiro Misono /* Copy subvolume's name */ 249423d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 249523d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 249623d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 249723d0b79dSTomohiro Misono args->name[item_len] = 0; 249823d0b79dSTomohiro Misono 2499b8a49ae1SJosef Bacik out_put: 250000246528SJosef Bacik btrfs_put_root(root); 250123d0b79dSTomohiro Misono out: 250223d0b79dSTomohiro Misono btrfs_free_path(path); 250323d0b79dSTomohiro Misono return ret; 250423d0b79dSTomohiro Misono } 250523d0b79dSTomohiro Misono 2506ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2507ac8e9819SChris Mason void __user *argp) 2508ac8e9819SChris Mason { 2509ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2510ac8e9819SChris Mason struct inode *inode; 251101b810b8SDavid Sterba int ret = 0; 2512ac8e9819SChris Mason 25132354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 25142354d08fSJulia Lawall if (IS_ERR(args)) 25152354d08fSJulia Lawall return PTR_ERR(args); 2516c2b96929SDan Carpenter 2517496ad9aaSAl Viro inode = file_inode(file); 2518ac8e9819SChris Mason 251901b810b8SDavid Sterba /* 252001b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 252101b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 252201b810b8SDavid Sterba */ 25231b53ac4dSChris Mason if (args->treeid == 0) 25241b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 25251b53ac4dSChris Mason 252601b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 252701b810b8SDavid Sterba args->name[0] = 0; 252801b810b8SDavid Sterba goto out; 252901b810b8SDavid Sterba } 253001b810b8SDavid Sterba 253101b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 253201b810b8SDavid Sterba ret = -EPERM; 253301b810b8SDavid Sterba goto out; 253401b810b8SDavid Sterba } 253501b810b8SDavid Sterba 2536ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2537ac8e9819SChris Mason args->treeid, args->objectid, 2538ac8e9819SChris Mason args->name); 2539ac8e9819SChris Mason 254001b810b8SDavid Sterba out: 2541ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2542ac8e9819SChris Mason ret = -EFAULT; 2543ac8e9819SChris Mason 2544ac8e9819SChris Mason kfree(args); 254598d377a0STARUISI Hiroaki return ret; 254698d377a0STARUISI Hiroaki } 254798d377a0STARUISI Hiroaki 254823d0b79dSTomohiro Misono /* 254923d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 255023d0b79dSTomohiro Misono * 255123d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 255223d0b79dSTomohiro Misono * 255323d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 255423d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 255523d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 255623d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 255723d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 255823d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 255923d0b79dSTomohiro Misono */ 256023d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 256123d0b79dSTomohiro Misono { 256223d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 256323d0b79dSTomohiro Misono struct inode *inode; 256423d0b79dSTomohiro Misono int ret; 256523d0b79dSTomohiro Misono 256623d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 256723d0b79dSTomohiro Misono if (IS_ERR(args)) 256823d0b79dSTomohiro Misono return PTR_ERR(args); 256923d0b79dSTomohiro Misono 257023d0b79dSTomohiro Misono inode = file_inode(file); 257123d0b79dSTomohiro Misono 257223d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 257323d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 257423d0b79dSTomohiro Misono /* 257523d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 257623d0b79dSTomohiro Misono * called 257723d0b79dSTomohiro Misono */ 257823d0b79dSTomohiro Misono kfree(args); 257923d0b79dSTomohiro Misono return -EACCES; 258023d0b79dSTomohiro Misono } 258123d0b79dSTomohiro Misono 258223d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 258323d0b79dSTomohiro Misono 258423d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 258523d0b79dSTomohiro Misono ret = -EFAULT; 258623d0b79dSTomohiro Misono 258723d0b79dSTomohiro Misono kfree(args); 258823d0b79dSTomohiro Misono return ret; 258923d0b79dSTomohiro Misono } 259023d0b79dSTomohiro Misono 2591b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2592b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2593b64ec075STomohiro Misono { 2594b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2595b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2596b64ec075STomohiro Misono struct btrfs_root *root; 2597b64ec075STomohiro Misono struct btrfs_path *path; 2598b64ec075STomohiro Misono struct btrfs_key key; 2599b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2600b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2601b64ec075STomohiro Misono struct extent_buffer *leaf; 2602b64ec075STomohiro Misono unsigned long item_off; 2603b64ec075STomohiro Misono unsigned long item_len; 2604b64ec075STomohiro Misono struct inode *inode; 2605b64ec075STomohiro Misono int slot; 2606b64ec075STomohiro Misono int ret = 0; 2607b64ec075STomohiro Misono 2608b64ec075STomohiro Misono path = btrfs_alloc_path(); 2609b64ec075STomohiro Misono if (!path) 2610b64ec075STomohiro Misono return -ENOMEM; 2611b64ec075STomohiro Misono 2612b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2613b64ec075STomohiro Misono if (!subvol_info) { 2614b64ec075STomohiro Misono btrfs_free_path(path); 2615b64ec075STomohiro Misono return -ENOMEM; 2616b64ec075STomohiro Misono } 2617b64ec075STomohiro Misono 2618b64ec075STomohiro Misono inode = file_inode(file); 2619b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2620b64ec075STomohiro Misono 2621b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2622b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 2623b64ec075STomohiro Misono key.type = BTRFS_ROOT_ITEM_KEY; 2624b64ec075STomohiro Misono key.offset = (u64)-1; 26253619c94fSJosef Bacik root = btrfs_get_fs_root(fs_info, &key, true); 2626b64ec075STomohiro Misono if (IS_ERR(root)) { 2627b64ec075STomohiro Misono ret = PTR_ERR(root); 262804734e84SJosef Bacik goto out_free; 262904734e84SJosef Bacik } 2630b64ec075STomohiro Misono root_item = &root->root_item; 2631b64ec075STomohiro Misono 2632b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2633b64ec075STomohiro Misono 2634b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2635b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2636b64ec075STomohiro Misono 2637b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2638b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2639b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2640b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2641b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2642b64ec075STomohiro Misono 2643b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2644b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2645b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2646b64ec075STomohiro Misono 2647b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2648b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2649b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2650b64ec075STomohiro Misono 2651b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2652b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2653b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2654b64ec075STomohiro Misono 2655b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2656b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2657b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2658b64ec075STomohiro Misono 2659b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2660b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2661b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2662b64ec075STomohiro Misono key.offset = 0; 266304734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2664b64ec075STomohiro Misono if (ret < 0) { 2665b64ec075STomohiro Misono goto out; 2666b64ec075STomohiro Misono } else if (path->slots[0] >= 2667b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 266804734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2669b64ec075STomohiro Misono if (ret < 0) { 2670b64ec075STomohiro Misono goto out; 2671b64ec075STomohiro Misono } else if (ret > 0) { 2672b64ec075STomohiro Misono ret = -EUCLEAN; 2673b64ec075STomohiro Misono goto out; 2674b64ec075STomohiro Misono } 2675b64ec075STomohiro Misono } 2676b64ec075STomohiro Misono 2677b64ec075STomohiro Misono leaf = path->nodes[0]; 2678b64ec075STomohiro Misono slot = path->slots[0]; 2679b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2680b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2681b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2682b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2683b64ec075STomohiro Misono 2684b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2685b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2686b64ec075STomohiro Misono 2687b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2688b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2689b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2690b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2691b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2692b64ec075STomohiro Misono item_off, item_len); 2693b64ec075STomohiro Misono } else { 2694b64ec075STomohiro Misono ret = -ENOENT; 2695b64ec075STomohiro Misono goto out; 2696b64ec075STomohiro Misono } 2697b64ec075STomohiro Misono } 2698b64ec075STomohiro Misono 2699b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2700b64ec075STomohiro Misono ret = -EFAULT; 2701b64ec075STomohiro Misono 2702b64ec075STomohiro Misono out: 270300246528SJosef Bacik btrfs_put_root(root); 270404734e84SJosef Bacik out_free: 2705b64ec075STomohiro Misono btrfs_free_path(path); 2706b64ec075STomohiro Misono kzfree(subvol_info); 2707b64ec075STomohiro Misono return ret; 2708b64ec075STomohiro Misono } 2709b64ec075STomohiro Misono 271042e4b520STomohiro Misono /* 271142e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 271242e4b520STomohiro Misono * except the subvolume name. 271342e4b520STomohiro Misono */ 271442e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 271542e4b520STomohiro Misono { 271642e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 271742e4b520STomohiro Misono struct btrfs_root_ref *rref; 271842e4b520STomohiro Misono struct btrfs_root *root; 271942e4b520STomohiro Misono struct btrfs_path *path; 272042e4b520STomohiro Misono struct btrfs_key key; 272142e4b520STomohiro Misono struct extent_buffer *leaf; 272242e4b520STomohiro Misono struct inode *inode; 272342e4b520STomohiro Misono u64 objectid; 272442e4b520STomohiro Misono int slot; 272542e4b520STomohiro Misono int ret; 272642e4b520STomohiro Misono u8 found; 272742e4b520STomohiro Misono 272842e4b520STomohiro Misono path = btrfs_alloc_path(); 272942e4b520STomohiro Misono if (!path) 273042e4b520STomohiro Misono return -ENOMEM; 273142e4b520STomohiro Misono 273242e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 273342e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 273442e4b520STomohiro Misono btrfs_free_path(path); 273542e4b520STomohiro Misono return PTR_ERR(rootrefs); 273642e4b520STomohiro Misono } 273742e4b520STomohiro Misono 273842e4b520STomohiro Misono inode = file_inode(file); 273942e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 274042e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 274142e4b520STomohiro Misono 274242e4b520STomohiro Misono key.objectid = objectid; 274342e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 274442e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 274542e4b520STomohiro Misono found = 0; 274642e4b520STomohiro Misono 274742e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 274842e4b520STomohiro Misono if (ret < 0) { 274942e4b520STomohiro Misono goto out; 275042e4b520STomohiro Misono } else if (path->slots[0] >= 275142e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 275242e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 275342e4b520STomohiro Misono if (ret < 0) { 275442e4b520STomohiro Misono goto out; 275542e4b520STomohiro Misono } else if (ret > 0) { 275642e4b520STomohiro Misono ret = -EUCLEAN; 275742e4b520STomohiro Misono goto out; 275842e4b520STomohiro Misono } 275942e4b520STomohiro Misono } 276042e4b520STomohiro Misono while (1) { 276142e4b520STomohiro Misono leaf = path->nodes[0]; 276242e4b520STomohiro Misono slot = path->slots[0]; 276342e4b520STomohiro Misono 276442e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 276542e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 276642e4b520STomohiro Misono ret = 0; 276742e4b520STomohiro Misono goto out; 276842e4b520STomohiro Misono } 276942e4b520STomohiro Misono 277042e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 277142e4b520STomohiro Misono ret = -EOVERFLOW; 277242e4b520STomohiro Misono goto out; 277342e4b520STomohiro Misono } 277442e4b520STomohiro Misono 277542e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 277642e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 277742e4b520STomohiro Misono rootrefs->rootref[found].dirid = 277842e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 277942e4b520STomohiro Misono found++; 278042e4b520STomohiro Misono 278142e4b520STomohiro Misono ret = btrfs_next_item(root, path); 278242e4b520STomohiro Misono if (ret < 0) { 278342e4b520STomohiro Misono goto out; 278442e4b520STomohiro Misono } else if (ret > 0) { 278542e4b520STomohiro Misono ret = -EUCLEAN; 278642e4b520STomohiro Misono goto out; 278742e4b520STomohiro Misono } 278842e4b520STomohiro Misono } 278942e4b520STomohiro Misono 279042e4b520STomohiro Misono out: 279142e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 279242e4b520STomohiro Misono rootrefs->num_items = found; 279342e4b520STomohiro Misono /* update min_treeid for next search */ 279442e4b520STomohiro Misono if (found) 279542e4b520STomohiro Misono rootrefs->min_treeid = 279642e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 279742e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 279842e4b520STomohiro Misono ret = -EFAULT; 279942e4b520STomohiro Misono } 280042e4b520STomohiro Misono 280142e4b520STomohiro Misono kfree(rootrefs); 280242e4b520STomohiro Misono btrfs_free_path(path); 280342e4b520STomohiro Misono 280442e4b520STomohiro Misono return ret; 280542e4b520STomohiro Misono } 280642e4b520STomohiro Misono 280776dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2808949964c9SMarcos Paulo de Souza void __user *arg, 2809949964c9SMarcos Paulo de Souza bool destroy_v2) 281076dda93cSYan, Zheng { 281154563d41SAl Viro struct dentry *parent = file->f_path.dentry; 28120b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 281376dda93cSYan, Zheng struct dentry *dentry; 28142b0143b5SDavid Howells struct inode *dir = d_inode(parent); 281576dda93cSYan, Zheng struct inode *inode; 281676dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 281776dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2818949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2819949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2820949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2821949964c9SMarcos Paulo de Souza int subvol_namelen; 282276dda93cSYan, Zheng int err = 0; 2823949964c9SMarcos Paulo de Souza bool destroy_parent = false; 282476dda93cSYan, Zheng 2825949964c9SMarcos Paulo de Souza if (destroy_v2) { 2826949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2827949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2828949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2829325c50e3SJeff Mahoney 2830949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2831949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2832949964c9SMarcos Paulo de Souza goto out; 2833949964c9SMarcos Paulo de Souza } 283476dda93cSYan, Zheng 2835949964c9SMarcos Paulo de Souza /* 2836949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2837949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2838949964c9SMarcos Paulo de Souza */ 2839949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2840949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2841949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2842949964c9SMarcos Paulo de Souza 2843949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2844949964c9SMarcos Paulo de Souza if (err) 2845949964c9SMarcos Paulo de Souza goto out; 2846949964c9SMarcos Paulo de Souza } else { 2847949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 284876dda93cSYan, Zheng err = -EINVAL; 284976dda93cSYan, Zheng goto out; 285076dda93cSYan, Zheng } 285176dda93cSYan, Zheng 2852a561be71SAl Viro err = mnt_want_write_file(file); 285376dda93cSYan, Zheng if (err) 285476dda93cSYan, Zheng goto out; 285576dda93cSYan, Zheng 2856949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2857949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2858949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2859949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2860949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2861949964c9SMarcos Paulo de Souza goto out_drop_write; 2862949964c9SMarcos Paulo de Souza } 2863949964c9SMarcos Paulo de Souza 2864949964c9SMarcos Paulo de Souza /* 2865949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2866949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2867949964c9SMarcos Paulo de Souza */ 2868949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2869949964c9SMarcos Paulo de Souza 2870949964c9SMarcos Paulo de Souza /* 2871949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2872949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2873949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2874949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2875949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2876949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2877949964c9SMarcos Paulo de Souza */ 2878949964c9SMarcos Paulo de Souza dput(dentry); 2879949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2880949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2881949964c9SMarcos Paulo de Souza goto out_drop_write; 2882949964c9SMarcos Paulo de Souza } 2883949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2884949964c9SMarcos Paulo de Souza 2885949964c9SMarcos Paulo de Souza /* 2886949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2887949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2888949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2889949964c9SMarcos Paulo de Souza * new parent dentry. 2890949964c9SMarcos Paulo de Souza */ 2891949964c9SMarcos Paulo de Souza destroy_parent = true; 2892949964c9SMarcos Paulo de Souza 2893949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2894949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2895949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2896949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2897949964c9SMarcos Paulo de Souza goto free_parent; 2898949964c9SMarcos Paulo de Souza } 2899949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2900949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2901949964c9SMarcos Paulo de Souza } 2902949964c9SMarcos Paulo de Souza } else { 2903949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2904949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2905949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2906949964c9SMarcos Paulo de Souza 2907949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2908949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2909949964c9SMarcos Paulo de Souza 2910949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2911949964c9SMarcos Paulo de Souza if (err) 2912949964c9SMarcos Paulo de Souza goto out; 2913949964c9SMarcos Paulo de Souza } 2914949964c9SMarcos Paulo de Souza 2915949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2916949964c9SMarcos Paulo de Souza 2917949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2918949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2919949964c9SMarcos Paulo de Souza err = -EINVAL; 2920949964c9SMarcos Paulo de Souza goto free_subvol_name; 2921949964c9SMarcos Paulo de Souza } 2922949964c9SMarcos Paulo de Souza 2923949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2924949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2925949964c9SMarcos Paulo de Souza goto free_subvol_name; 2926949964c9SMarcos Paulo de Souza } 2927521e0546SDavid Sterba 292800235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 292900235411SAl Viro if (err == -EINTR) 2930949964c9SMarcos Paulo de Souza goto free_subvol_name; 2931949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 293276dda93cSYan, Zheng if (IS_ERR(dentry)) { 293376dda93cSYan, Zheng err = PTR_ERR(dentry); 293476dda93cSYan, Zheng goto out_unlock_dir; 293576dda93cSYan, Zheng } 293676dda93cSYan, Zheng 29372b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 293876dda93cSYan, Zheng err = -ENOENT; 293976dda93cSYan, Zheng goto out_dput; 294076dda93cSYan, Zheng } 294176dda93cSYan, Zheng 29422b0143b5SDavid Howells inode = d_inode(dentry); 29434260f7c7SSage Weil dest = BTRFS_I(inode)->root; 29444260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 29454260f7c7SSage Weil /* 29464260f7c7SSage Weil * Regular user. Only allow this with a special mount 29474260f7c7SSage Weil * option, when the user has write+exec access to the 29484260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 29494260f7c7SSage Weil * allowed. 29504260f7c7SSage Weil * 29514260f7c7SSage Weil * Note that this is _not_ check that the subvol is 29524260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 29534260f7c7SSage Weil * otherwise be able to delete. 29544260f7c7SSage Weil * 29554260f7c7SSage Weil * Users who want to delete empty subvols should try 29564260f7c7SSage Weil * rmdir(2). 29574260f7c7SSage Weil */ 29584260f7c7SSage Weil err = -EPERM; 29590b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 29604260f7c7SSage Weil goto out_dput; 29614260f7c7SSage Weil 29624260f7c7SSage Weil /* 29634260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 29644260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 29654260f7c7SSage Weil * must be called on the dentry referencing the root 29664260f7c7SSage Weil * of the subvol, not a random directory contained 29674260f7c7SSage Weil * within it. 29684260f7c7SSage Weil */ 29694260f7c7SSage Weil err = -EINVAL; 29704260f7c7SSage Weil if (root == dest) 29714260f7c7SSage Weil goto out_dput; 29724260f7c7SSage Weil 29734260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 29744260f7c7SSage Weil if (err) 29754260f7c7SSage Weil goto out_dput; 29765c39da5bSMiao Xie } 29774260f7c7SSage Weil 29785c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 29794260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 29804260f7c7SSage Weil if (err) 29814260f7c7SSage Weil goto out_dput; 29824260f7c7SSage Weil 29834a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 298476dda93cSYan, Zheng err = -EINVAL; 298576dda93cSYan, Zheng goto out_dput; 298676dda93cSYan, Zheng } 298776dda93cSYan, Zheng 29885955102cSAl Viro inode_lock(inode); 2989f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 29905955102cSAl Viro inode_unlock(inode); 299146008d9dSAmir Goldstein if (!err) { 299246008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 299376dda93cSYan, Zheng d_delete(dentry); 299446008d9dSAmir Goldstein } 2995fa6ac876SLiu Bo 299676dda93cSYan, Zheng out_dput: 299776dda93cSYan, Zheng dput(dentry); 299876dda93cSYan, Zheng out_unlock_dir: 29995955102cSAl Viro inode_unlock(dir); 3000949964c9SMarcos Paulo de Souza free_subvol_name: 3001949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3002949964c9SMarcos Paulo de Souza free_parent: 3003949964c9SMarcos Paulo de Souza if (destroy_parent) 3004949964c9SMarcos Paulo de Souza dput(parent); 300500235411SAl Viro out_drop_write: 30062a79f17eSAl Viro mnt_drop_write_file(file); 300776dda93cSYan, Zheng out: 3008949964c9SMarcos Paulo de Souza kfree(vol_args2); 300976dda93cSYan, Zheng kfree(vol_args); 301076dda93cSYan, Zheng return err; 301176dda93cSYan, Zheng } 301276dda93cSYan, Zheng 30131e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3014f46b5a66SChristoph Hellwig { 3015496ad9aaSAl Viro struct inode *inode = file_inode(file); 3016f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 30171e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3018c146afadSYan Zheng int ret; 3019c146afadSYan Zheng 302025122d15SIlya Dryomov ret = mnt_want_write_file(file); 302125122d15SIlya Dryomov if (ret) 302225122d15SIlya Dryomov return ret; 3023b83cc969SLi Zefan 302425122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 302525122d15SIlya Dryomov ret = -EROFS; 302625122d15SIlya Dryomov goto out; 30275ac00addSStefan Behrens } 3028f46b5a66SChristoph Hellwig 3029f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3030f46b5a66SChristoph Hellwig case S_IFDIR: 3031e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3032e441d54dSChris Mason ret = -EPERM; 3033e441d54dSChris Mason goto out; 3034e441d54dSChris Mason } 3035de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3036f46b5a66SChristoph Hellwig break; 3037f46b5a66SChristoph Hellwig case S_IFREG: 3038616d374eSAdam Borowski /* 3039616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3040616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3041616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3042616d374eSAdam Borowski */ 3043616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3044616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3045616d374eSAdam Borowski ret = -EPERM; 3046e441d54dSChris Mason goto out; 3047e441d54dSChris Mason } 30481e701a32SChris Mason 30491e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 30501e701a32SChris Mason if (!range) { 30511e701a32SChris Mason ret = -ENOMEM; 30521e701a32SChris Mason goto out; 30531e701a32SChris Mason } 30541e701a32SChris Mason 30551e701a32SChris Mason if (argp) { 30561e701a32SChris Mason if (copy_from_user(range, argp, 30571e701a32SChris Mason sizeof(*range))) { 30581e701a32SChris Mason ret = -EFAULT; 30591e701a32SChris Mason kfree(range); 3060683be16eSDan Carpenter goto out; 30611e701a32SChris Mason } 30621e701a32SChris Mason /* compression requires us to start the IO */ 30631e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 30641e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 30651e701a32SChris Mason range->extent_thresh = (u32)-1; 30661e701a32SChris Mason } 30671e701a32SChris Mason } else { 30681e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 30691e701a32SChris Mason range->len = (u64)-1; 30701e701a32SChris Mason } 3071496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 30727c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 30734cb5300bSChris Mason if (ret > 0) 30744cb5300bSChris Mason ret = 0; 30751e701a32SChris Mason kfree(range); 3076f46b5a66SChristoph Hellwig break; 30778929ecfaSYan, Zheng default: 30788929ecfaSYan, Zheng ret = -EINVAL; 3079f46b5a66SChristoph Hellwig } 3080e441d54dSChris Mason out: 308125122d15SIlya Dryomov mnt_drop_write_file(file); 3082e441d54dSChris Mason return ret; 3083f46b5a66SChristoph Hellwig } 3084f46b5a66SChristoph Hellwig 30852ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3086f46b5a66SChristoph Hellwig { 3087f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3088f46b5a66SChristoph Hellwig int ret; 3089f46b5a66SChristoph Hellwig 3090e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3091e441d54dSChris Mason return -EPERM; 3092e441d54dSChris Mason 3093171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) 3094e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3095c9e9f97bSIlya Dryomov 3096dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3097c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3098c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3099c9e9f97bSIlya Dryomov goto out; 3100c9e9f97bSIlya Dryomov } 3101f46b5a66SChristoph Hellwig 31025516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31032ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3104f46b5a66SChristoph Hellwig 310543d20761SAnand Jain if (!ret) 31060b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 310743d20761SAnand Jain 3108f46b5a66SChristoph Hellwig kfree(vol_args); 3109c9e9f97bSIlya Dryomov out: 3110171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3111f46b5a66SChristoph Hellwig return ret; 3112f46b5a66SChristoph Hellwig } 3113f46b5a66SChristoph Hellwig 31146b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3115f46b5a66SChristoph Hellwig { 31160b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31170b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 31186b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3119f46b5a66SChristoph Hellwig int ret; 3120f46b5a66SChristoph Hellwig 3121e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3122e441d54dSChris Mason return -EPERM; 3123e441d54dSChris Mason 3124da24927bSMiao Xie ret = mnt_want_write_file(file); 3125da24927bSMiao Xie if (ret) 3126da24927bSMiao Xie return ret; 3127c146afadSYan Zheng 3128dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3129c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3130c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3131c47ca32dSDan Carpenter goto err_drop; 3132c9e9f97bSIlya Dryomov } 3133f46b5a66SChristoph Hellwig 3134748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3135fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3136fd4e994bSOmar Sandoval goto out; 3137fd4e994bSOmar Sandoval } 3138f46b5a66SChristoph Hellwig 3139171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3140183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3141183860f6SAnand Jain goto out; 3142183860f6SAnand Jain } 3143183860f6SAnand Jain 3144735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 31452ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 31466b526ed7SAnand Jain } else { 31476b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 31482ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 31496b526ed7SAnand Jain } 3150171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 3151183860f6SAnand Jain 31526b526ed7SAnand Jain if (!ret) { 3153735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 31540b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 31556b526ed7SAnand Jain vol_args->devid); 31566b526ed7SAnand Jain else 31570b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 31586b526ed7SAnand Jain vol_args->name); 31596b526ed7SAnand Jain } 3160183860f6SAnand Jain out: 3161183860f6SAnand Jain kfree(vol_args); 3162c47ca32dSDan Carpenter err_drop: 31634ac20c70SIlya Dryomov mnt_drop_write_file(file); 3164f46b5a66SChristoph Hellwig return ret; 3165f46b5a66SChristoph Hellwig } 3166f46b5a66SChristoph Hellwig 3167f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3168f46b5a66SChristoph Hellwig { 31690b246afaSJeff Mahoney struct inode *inode = file_inode(file); 31700b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3171f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3172f46b5a66SChristoph Hellwig int ret; 3173f46b5a66SChristoph Hellwig 3174f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3175f46b5a66SChristoph Hellwig return -EPERM; 3176f46b5a66SChristoph Hellwig 3177f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3178f46b5a66SChristoph Hellwig if (ret) 3179f46b5a66SChristoph Hellwig return ret; 3180f46b5a66SChristoph Hellwig 3181171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3182f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 318358d7bbf8SDavid Sterba goto out_drop_write; 318458d7bbf8SDavid Sterba } 318558d7bbf8SDavid Sterba 318658d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 318758d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 318858d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3189f46b5a66SChristoph Hellwig goto out; 3190f46b5a66SChristoph Hellwig } 3191f46b5a66SChristoph Hellwig 319258d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31932ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3194f46b5a66SChristoph Hellwig 3195f46b5a66SChristoph Hellwig if (!ret) 31960b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3197f46b5a66SChristoph Hellwig kfree(vol_args); 319858d7bbf8SDavid Sterba out: 3199171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 320058d7bbf8SDavid Sterba out_drop_write: 3201f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 320258d7bbf8SDavid Sterba 3203f46b5a66SChristoph Hellwig return ret; 3204f46b5a66SChristoph Hellwig } 3205f46b5a66SChristoph Hellwig 32062ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 32072ff7e61eSJeff Mahoney void __user *arg) 3208475f6387SJan Schmidt { 3209027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3210475f6387SJan Schmidt struct btrfs_device *device; 32110b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3212027ed2f0SLi Zefan int ret = 0; 3213475f6387SJan Schmidt 3214027ed2f0SLi Zefan fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); 3215027ed2f0SLi Zefan if (!fi_args) 3216027ed2f0SLi Zefan return -ENOMEM; 3217027ed2f0SLi Zefan 3218d03262c7SDavid Sterba rcu_read_lock(); 3219027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3220475f6387SJan Schmidt 3221d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3222027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3223027ed2f0SLi Zefan fi_args->max_id = device->devid; 3224475f6387SJan Schmidt } 3225d03262c7SDavid Sterba rcu_read_unlock(); 3226475f6387SJan Schmidt 3227de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3228bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3229bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3230bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 323180a773fbSDavid Sterba 3232027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3233027ed2f0SLi Zefan ret = -EFAULT; 3234475f6387SJan Schmidt 3235027ed2f0SLi Zefan kfree(fi_args); 3236027ed2f0SLi Zefan return ret; 3237475f6387SJan Schmidt } 3238475f6387SJan Schmidt 32392ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 32402ff7e61eSJeff Mahoney void __user *arg) 3241475f6387SJan Schmidt { 3242475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3243475f6387SJan Schmidt struct btrfs_device *dev; 3244475f6387SJan Schmidt int ret = 0; 3245475f6387SJan Schmidt char *s_uuid = NULL; 3246475f6387SJan Schmidt 3247475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3248475f6387SJan Schmidt if (IS_ERR(di_args)) 3249475f6387SJan Schmidt return PTR_ERR(di_args); 3250475f6387SJan Schmidt 3251dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3252475f6387SJan Schmidt s_uuid = di_args->uuid; 3253475f6387SJan Schmidt 3254c5593ca3SDavid Sterba rcu_read_lock(); 3255e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 325609ba3bc9SAnand Jain NULL, true); 3257475f6387SJan Schmidt 3258475f6387SJan Schmidt if (!dev) { 3259475f6387SJan Schmidt ret = -ENODEV; 3260475f6387SJan Schmidt goto out; 3261475f6387SJan Schmidt } 3262475f6387SJan Schmidt 3263475f6387SJan Schmidt di_args->devid = dev->devid; 32647cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 32657cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3266475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3267a27202fbSJim Meyering if (dev->name) { 3268672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3269672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3270a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3271a27202fbSJim Meyering } else { 327299ba55adSStefan Behrens di_args->path[0] = '\0'; 3273a27202fbSJim Meyering } 3274475f6387SJan Schmidt 3275475f6387SJan Schmidt out: 3276c5593ca3SDavid Sterba rcu_read_unlock(); 3277475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3278475f6387SJan Schmidt ret = -EFAULT; 3279475f6387SJan Schmidt 3280475f6387SJan Schmidt kfree(di_args); 3281475f6387SJan Schmidt return ret; 3282475f6387SJan Schmidt } 3283475f6387SJan Schmidt 32846ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 32856ef5ed0dSJosef Bacik { 3286496ad9aaSAl Viro struct inode *inode = file_inode(file); 32870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32886ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 32896ef5ed0dSJosef Bacik struct btrfs_root *new_root; 32906ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 32916ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 32922a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 32936ef5ed0dSJosef Bacik struct btrfs_key location; 32946ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 32956ef5ed0dSJosef Bacik u64 objectid = 0; 32966ef5ed0dSJosef Bacik u64 dir_id; 32973c04ce01SMiao Xie int ret; 32986ef5ed0dSJosef Bacik 32996ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 33006ef5ed0dSJosef Bacik return -EPERM; 33016ef5ed0dSJosef Bacik 33023c04ce01SMiao Xie ret = mnt_want_write_file(file); 33033c04ce01SMiao Xie if (ret) 33043c04ce01SMiao Xie return ret; 33053c04ce01SMiao Xie 33063c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 33073c04ce01SMiao Xie ret = -EFAULT; 33083c04ce01SMiao Xie goto out; 33093c04ce01SMiao Xie } 33106ef5ed0dSJosef Bacik 33116ef5ed0dSJosef Bacik if (!objectid) 33121cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 33136ef5ed0dSJosef Bacik 33146ef5ed0dSJosef Bacik location.objectid = objectid; 33156ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 33166ef5ed0dSJosef Bacik location.offset = (u64)-1; 33176ef5ed0dSJosef Bacik 33183619c94fSJosef Bacik new_root = btrfs_get_fs_root(fs_info, &location, true); 33193c04ce01SMiao Xie if (IS_ERR(new_root)) { 33203c04ce01SMiao Xie ret = PTR_ERR(new_root); 33213c04ce01SMiao Xie goto out; 33223c04ce01SMiao Xie } 33232a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 33242a2b5d62SJosef Bacik ret = -ENOENT; 33252a2b5d62SJosef Bacik goto out_free; 33262a2b5d62SJosef Bacik } 33276ef5ed0dSJosef Bacik 33286ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 33293c04ce01SMiao Xie if (!path) { 33303c04ce01SMiao Xie ret = -ENOMEM; 33312a2b5d62SJosef Bacik goto out_free; 33323c04ce01SMiao Xie } 33336ef5ed0dSJosef Bacik path->leave_spinning = 1; 33346ef5ed0dSJosef Bacik 33356ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 333698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 33373c04ce01SMiao Xie ret = PTR_ERR(trans); 33382a2b5d62SJosef Bacik goto out_free; 33396ef5ed0dSJosef Bacik } 33406ef5ed0dSJosef Bacik 33410b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 33420b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 33436ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3344cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 33452a2b5d62SJosef Bacik btrfs_release_path(path); 33463a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33470b246afaSJeff Mahoney btrfs_err(fs_info, 33485d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 33493c04ce01SMiao Xie ret = -ENOENT; 33502a2b5d62SJosef Bacik goto out_free; 33516ef5ed0dSJosef Bacik } 33526ef5ed0dSJosef Bacik 33536ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 33546ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 33556ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 33562a2b5d62SJosef Bacik btrfs_release_path(path); 33576ef5ed0dSJosef Bacik 33580b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 33593a45bb20SJeff Mahoney btrfs_end_transaction(trans); 33602a2b5d62SJosef Bacik out_free: 336100246528SJosef Bacik btrfs_put_root(new_root); 33622a2b5d62SJosef Bacik btrfs_free_path(path); 33633c04ce01SMiao Xie out: 33643c04ce01SMiao Xie mnt_drop_write_file(file); 33653c04ce01SMiao Xie return ret; 33666ef5ed0dSJosef Bacik } 33676ef5ed0dSJosef Bacik 3368c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3369bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3370bf5fc093SJosef Bacik { 337132da5386SDavid Sterba struct btrfs_block_group *block_group; 3372bf5fc093SJosef Bacik 3373bf5fc093SJosef Bacik space->total_bytes = 0; 3374bf5fc093SJosef Bacik space->used_bytes = 0; 3375bf5fc093SJosef Bacik space->flags = 0; 3376bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3377bf5fc093SJosef Bacik space->flags = block_group->flags; 3378b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3379bf38be65SDavid Sterba space->used_bytes += block_group->used; 3380bf5fc093SJosef Bacik } 3381bf5fc093SJosef Bacik } 3382bf5fc093SJosef Bacik 33832ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 33842ff7e61eSJeff Mahoney void __user *arg) 33851406e432SJosef Bacik { 33861406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 33871406e432SJosef Bacik struct btrfs_ioctl_space_info space; 33881406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 33897fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 339013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 33911406e432SJosef Bacik struct btrfs_space_info *info; 3392315d8e98SColin Ian King static const u64 types[] = { 3393315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3394bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3395bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3396315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3397315d8e98SColin Ian King }; 3398bf5fc093SJosef Bacik int num_types = 4; 33997fde62bfSChris Mason int alloc_size; 34001406e432SJosef Bacik int ret = 0; 340151788b1bSDan Rosenberg u64 slot_count = 0; 3402bf5fc093SJosef Bacik int i, c; 34031406e432SJosef Bacik 34041406e432SJosef Bacik if (copy_from_user(&space_args, 34051406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 34061406e432SJosef Bacik sizeof(space_args))) 34071406e432SJosef Bacik return -EFAULT; 34081406e432SJosef Bacik 3409bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3410bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3411bf5fc093SJosef Bacik 3412bf5fc093SJosef Bacik info = NULL; 34137fde62bfSChris Mason rcu_read_lock(); 34140b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3415bf5fc093SJosef Bacik list) { 3416bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3417bf5fc093SJosef Bacik info = tmp; 3418bf5fc093SJosef Bacik break; 3419bf5fc093SJosef Bacik } 3420bf5fc093SJosef Bacik } 34217fde62bfSChris Mason rcu_read_unlock(); 34221406e432SJosef Bacik 3423bf5fc093SJosef Bacik if (!info) 3424bf5fc093SJosef Bacik continue; 3425bf5fc093SJosef Bacik 3426bf5fc093SJosef Bacik down_read(&info->groups_sem); 3427bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3428bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3429bf5fc093SJosef Bacik slot_count++; 3430bf5fc093SJosef Bacik } 3431bf5fc093SJosef Bacik up_read(&info->groups_sem); 3432bf5fc093SJosef Bacik } 3433bf5fc093SJosef Bacik 343436523e95SDavid Sterba /* 343536523e95SDavid Sterba * Global block reserve, exported as a space_info 343636523e95SDavid Sterba */ 343736523e95SDavid Sterba slot_count++; 343836523e95SDavid Sterba 34397fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 34407fde62bfSChris Mason if (space_args.space_slots == 0) { 34417fde62bfSChris Mason space_args.total_spaces = slot_count; 34427fde62bfSChris Mason goto out; 34437fde62bfSChris Mason } 3444bf5fc093SJosef Bacik 344551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3446bf5fc093SJosef Bacik 34477fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3448bf5fc093SJosef Bacik 34497fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 34507fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 34517fde62bfSChris Mason */ 345209cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 34537fde62bfSChris Mason return -ENOMEM; 34547fde62bfSChris Mason 34557fde62bfSChris Mason space_args.total_spaces = 0; 34568d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 34577fde62bfSChris Mason if (!dest) 34587fde62bfSChris Mason return -ENOMEM; 34597fde62bfSChris Mason dest_orig = dest; 34607fde62bfSChris Mason 34617fde62bfSChris Mason /* now we have a buffer to copy into */ 3462bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3463bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3464bf5fc093SJosef Bacik 346551788b1bSDan Rosenberg if (!slot_count) 346651788b1bSDan Rosenberg break; 346751788b1bSDan Rosenberg 3468bf5fc093SJosef Bacik info = NULL; 34691406e432SJosef Bacik rcu_read_lock(); 34700b246afaSJeff Mahoney list_for_each_entry_rcu(tmp, &fs_info->space_info, 3471bf5fc093SJosef Bacik list) { 3472bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3473bf5fc093SJosef Bacik info = tmp; 34747fde62bfSChris Mason break; 3475bf5fc093SJosef Bacik } 3476bf5fc093SJosef Bacik } 3477bf5fc093SJosef Bacik rcu_read_unlock(); 34787fde62bfSChris Mason 3479bf5fc093SJosef Bacik if (!info) 3480bf5fc093SJosef Bacik continue; 3481bf5fc093SJosef Bacik down_read(&info->groups_sem); 3482bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3483bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3484c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3485c065f5b1SSu Yue &space); 34867fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 34871406e432SJosef Bacik dest++; 34881406e432SJosef Bacik space_args.total_spaces++; 348951788b1bSDan Rosenberg slot_count--; 34901406e432SJosef Bacik } 349151788b1bSDan Rosenberg if (!slot_count) 349251788b1bSDan Rosenberg break; 3493bf5fc093SJosef Bacik } 3494bf5fc093SJosef Bacik up_read(&info->groups_sem); 3495bf5fc093SJosef Bacik } 34961406e432SJosef Bacik 349736523e95SDavid Sterba /* 349836523e95SDavid Sterba * Add global block reserve 349936523e95SDavid Sterba */ 350036523e95SDavid Sterba if (slot_count) { 35010b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 350236523e95SDavid Sterba 350336523e95SDavid Sterba spin_lock(&block_rsv->lock); 350436523e95SDavid Sterba space.total_bytes = block_rsv->size; 350536523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 350636523e95SDavid Sterba spin_unlock(&block_rsv->lock); 350736523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 350836523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 350936523e95SDavid Sterba space_args.total_spaces++; 351036523e95SDavid Sterba } 351136523e95SDavid Sterba 35122eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 35137fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 35147fde62bfSChris Mason 35157fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 35167fde62bfSChris Mason ret = -EFAULT; 35177fde62bfSChris Mason 35187fde62bfSChris Mason kfree(dest_orig); 35197fde62bfSChris Mason out: 35207fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 35211406e432SJosef Bacik ret = -EFAULT; 35221406e432SJosef Bacik 35231406e432SJosef Bacik return ret; 35241406e432SJosef Bacik } 35251406e432SJosef Bacik 35269a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 35279a8c28beSMiao Xie void __user *argp) 352846204592SSage Weil { 352946204592SSage Weil struct btrfs_trans_handle *trans; 353046204592SSage Weil u64 transid; 3531db5b493aSTsutomu Itoh int ret; 353246204592SSage Weil 3533d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3534ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3535ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 353698d5dc13STsutomu Itoh return PTR_ERR(trans); 3537ff7c1d33SMiao Xie 3538ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3539ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3540ff7c1d33SMiao Xie goto out; 3541ff7c1d33SMiao Xie } 354246204592SSage Weil transid = trans->transid; 35433a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 35448b2b2d3cSTsutomu Itoh if (ret) { 35453a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3546db5b493aSTsutomu Itoh return ret; 35478b2b2d3cSTsutomu Itoh } 3548ff7c1d33SMiao Xie out: 354946204592SSage Weil if (argp) 355046204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 355146204592SSage Weil return -EFAULT; 355246204592SSage Weil return 0; 355346204592SSage Weil } 355446204592SSage Weil 35552ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 35569a8c28beSMiao Xie void __user *argp) 355746204592SSage Weil { 355846204592SSage Weil u64 transid; 355946204592SSage Weil 356046204592SSage Weil if (argp) { 356146204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 356246204592SSage Weil return -EFAULT; 356346204592SSage Weil } else { 356446204592SSage Weil transid = 0; /* current trans */ 356546204592SSage Weil } 35662ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 356746204592SSage Weil } 356846204592SSage Weil 3569b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3570475f6387SJan Schmidt { 35710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3572475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3573b8e95489SMiao Xie int ret; 3574475f6387SJan Schmidt 3575475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3576475f6387SJan Schmidt return -EPERM; 3577475f6387SJan Schmidt 3578475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3579475f6387SJan Schmidt if (IS_ERR(sa)) 3580475f6387SJan Schmidt return PTR_ERR(sa); 3581475f6387SJan Schmidt 3582b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3583b8e95489SMiao Xie ret = mnt_want_write_file(file); 3584b8e95489SMiao Xie if (ret) 3585b8e95489SMiao Xie goto out; 3586b8e95489SMiao Xie } 3587b8e95489SMiao Xie 35880b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 358963a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 359063a212abSStefan Behrens 0); 3591475f6387SJan Schmidt 35925afe6ce7SFilipe Manana /* 35935afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 35945afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 35955afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 35965afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 35975afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 35985afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 35995afe6ce7SFilipe Manana * previously (btrfs-progs does this). 36005afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 36015afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 36025afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 36035afe6ce7SFilipe Manana */ 36045afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3605475f6387SJan Schmidt ret = -EFAULT; 3606475f6387SJan Schmidt 3607b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3608b8e95489SMiao Xie mnt_drop_write_file(file); 3609b8e95489SMiao Xie out: 3610475f6387SJan Schmidt kfree(sa); 3611475f6387SJan Schmidt return ret; 3612475f6387SJan Schmidt } 3613475f6387SJan Schmidt 36142ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3615475f6387SJan Schmidt { 3616475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3617475f6387SJan Schmidt return -EPERM; 3618475f6387SJan Schmidt 36192ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3620475f6387SJan Schmidt } 3621475f6387SJan Schmidt 36222ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3623475f6387SJan Schmidt void __user *arg) 3624475f6387SJan Schmidt { 3625475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3626475f6387SJan Schmidt int ret; 3627475f6387SJan Schmidt 3628475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3629475f6387SJan Schmidt return -EPERM; 3630475f6387SJan Schmidt 3631475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3632475f6387SJan Schmidt if (IS_ERR(sa)) 3633475f6387SJan Schmidt return PTR_ERR(sa); 3634475f6387SJan Schmidt 36352ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3636475f6387SJan Schmidt 36374fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3638475f6387SJan Schmidt ret = -EFAULT; 3639475f6387SJan Schmidt 3640475f6387SJan Schmidt kfree(sa); 3641475f6387SJan Schmidt return ret; 3642475f6387SJan Schmidt } 3643475f6387SJan Schmidt 36442ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3645b27f7c0cSDavid Sterba void __user *arg) 3646c11d2c23SStefan Behrens { 3647c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3648c11d2c23SStefan Behrens int ret; 3649c11d2c23SStefan Behrens 3650c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3651c11d2c23SStefan Behrens if (IS_ERR(sa)) 3652c11d2c23SStefan Behrens return PTR_ERR(sa); 3653c11d2c23SStefan Behrens 3654b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3655b27f7c0cSDavid Sterba kfree(sa); 3656b27f7c0cSDavid Sterba return -EPERM; 3657b27f7c0cSDavid Sterba } 3658b27f7c0cSDavid Sterba 36592ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3660c11d2c23SStefan Behrens 3661eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3662c11d2c23SStefan Behrens ret = -EFAULT; 3663c11d2c23SStefan Behrens 3664c11d2c23SStefan Behrens kfree(sa); 3665c11d2c23SStefan Behrens return ret; 3666c11d2c23SStefan Behrens } 3667c11d2c23SStefan Behrens 36682ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 36692ff7e61eSJeff Mahoney void __user *arg) 36703f6bcfbdSStefan Behrens { 36713f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 36723f6bcfbdSStefan Behrens int ret; 36733f6bcfbdSStefan Behrens 36743f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 36753f6bcfbdSStefan Behrens return -EPERM; 36763f6bcfbdSStefan Behrens 36773f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 36783f6bcfbdSStefan Behrens if (IS_ERR(p)) 36793f6bcfbdSStefan Behrens return PTR_ERR(p); 36803f6bcfbdSStefan Behrens 36813f6bcfbdSStefan Behrens switch (p->cmd) { 36823f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3683bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3684adfa97cbSIlya Dryomov ret = -EROFS; 3685adfa97cbSIlya Dryomov goto out; 3686adfa97cbSIlya Dryomov } 3687171938e5SDavid Sterba if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3688e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 36893f6bcfbdSStefan Behrens } else { 36902ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3691171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 36923f6bcfbdSStefan Behrens } 36933f6bcfbdSStefan Behrens break; 36943f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 36950b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 36963f6bcfbdSStefan Behrens ret = 0; 36973f6bcfbdSStefan Behrens break; 36983f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 369917d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 370097282031SAnand Jain ret = 0; 37013f6bcfbdSStefan Behrens break; 37023f6bcfbdSStefan Behrens default: 37033f6bcfbdSStefan Behrens ret = -EINVAL; 37043f6bcfbdSStefan Behrens break; 37053f6bcfbdSStefan Behrens } 37063f6bcfbdSStefan Behrens 3707d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 37083f6bcfbdSStefan Behrens ret = -EFAULT; 3709adfa97cbSIlya Dryomov out: 37103f6bcfbdSStefan Behrens kfree(p); 37113f6bcfbdSStefan Behrens return ret; 37123f6bcfbdSStefan Behrens } 37133f6bcfbdSStefan Behrens 3714d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3715d7728c96SJan Schmidt { 3716d7728c96SJan Schmidt int ret = 0; 3717d7728c96SJan Schmidt int i; 3718740c3d22SChris Mason u64 rel_ptr; 3719d7728c96SJan Schmidt int size; 3720806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3721d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3722d7728c96SJan Schmidt struct btrfs_path *path; 3723d7728c96SJan Schmidt 372482b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3725d7728c96SJan Schmidt return -EPERM; 3726d7728c96SJan Schmidt 3727d7728c96SJan Schmidt path = btrfs_alloc_path(); 3728d7728c96SJan Schmidt if (!path) { 3729d7728c96SJan Schmidt ret = -ENOMEM; 3730d7728c96SJan Schmidt goto out; 3731d7728c96SJan Schmidt } 3732d7728c96SJan Schmidt 3733d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3734d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3735d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3736d7728c96SJan Schmidt ipa = NULL; 3737d7728c96SJan Schmidt goto out; 3738d7728c96SJan Schmidt } 3739d7728c96SJan Schmidt 3740d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3741d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3742d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3743d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3744d7728c96SJan Schmidt ipath = NULL; 3745d7728c96SJan Schmidt goto out; 3746d7728c96SJan Schmidt } 3747d7728c96SJan Schmidt 3748d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3749d7728c96SJan Schmidt if (ret < 0) 3750d7728c96SJan Schmidt goto out; 3751d7728c96SJan Schmidt 3752d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3753745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3754745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3755740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3756d7728c96SJan Schmidt } 3757d7728c96SJan Schmidt 3758718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3759718dc5faSOmar Sandoval ipath->fspath, size); 3760d7728c96SJan Schmidt if (ret) { 3761d7728c96SJan Schmidt ret = -EFAULT; 3762d7728c96SJan Schmidt goto out; 3763d7728c96SJan Schmidt } 3764d7728c96SJan Schmidt 3765d7728c96SJan Schmidt out: 3766d7728c96SJan Schmidt btrfs_free_path(path); 3767d7728c96SJan Schmidt free_ipath(ipath); 3768d7728c96SJan Schmidt kfree(ipa); 3769d7728c96SJan Schmidt 3770d7728c96SJan Schmidt return ret; 3771d7728c96SJan Schmidt } 3772d7728c96SJan Schmidt 3773d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3774d7728c96SJan Schmidt { 3775d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3776d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3777d7728c96SJan Schmidt 3778d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3779d7728c96SJan Schmidt inodes->bytes_left -= c; 3780d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3781d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3782d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3783d7728c96SJan Schmidt inodes->elem_cnt += 3; 3784d7728c96SJan Schmidt } else { 3785d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3786d7728c96SJan Schmidt inodes->bytes_left = 0; 3787d7728c96SJan Schmidt inodes->elem_missed += 3; 3788d7728c96SJan Schmidt } 3789d7728c96SJan Schmidt 3790d7728c96SJan Schmidt return 0; 3791d7728c96SJan Schmidt } 3792d7728c96SJan Schmidt 37932ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3794d24a67b2SZygo Blaxell void __user *arg, int version) 3795d7728c96SJan Schmidt { 3796d7728c96SJan Schmidt int ret = 0; 3797d7728c96SJan Schmidt int size; 3798d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3799d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3800d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3801d24a67b2SZygo Blaxell bool ignore_offset; 3802d7728c96SJan Schmidt 3803d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3804d7728c96SJan Schmidt return -EPERM; 3805d7728c96SJan Schmidt 3806d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 38077b9ea627SShailendra Verma if (IS_ERR(loi)) 38087b9ea627SShailendra Verma return PTR_ERR(loi); 3809d7728c96SJan Schmidt 3810d24a67b2SZygo Blaxell if (version == 1) { 3811d24a67b2SZygo Blaxell ignore_offset = false; 3812b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3813d24a67b2SZygo Blaxell } else { 3814d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3815d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3816d24a67b2SZygo Blaxell ret = -EINVAL; 3817d24a67b2SZygo Blaxell goto out_loi; 3818d24a67b2SZygo Blaxell } 3819d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3820d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3821d24a67b2SZygo Blaxell ret = -EINVAL; 3822d24a67b2SZygo Blaxell goto out_loi; 3823d24a67b2SZygo Blaxell } 3824d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3825b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3826d24a67b2SZygo Blaxell } 3827d24a67b2SZygo Blaxell 3828d7728c96SJan Schmidt path = btrfs_alloc_path(); 3829d7728c96SJan Schmidt if (!path) { 3830d7728c96SJan Schmidt ret = -ENOMEM; 3831d7728c96SJan Schmidt goto out; 3832d7728c96SJan Schmidt } 3833d7728c96SJan Schmidt 3834d7728c96SJan Schmidt inodes = init_data_container(size); 3835d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3836d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3837d7728c96SJan Schmidt inodes = NULL; 3838d7728c96SJan Schmidt goto out; 3839d7728c96SJan Schmidt } 3840d7728c96SJan Schmidt 38412ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3842d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3843df031f07SLiu Bo if (ret == -EINVAL) 3844d7728c96SJan Schmidt ret = -ENOENT; 3845d7728c96SJan Schmidt if (ret < 0) 3846d7728c96SJan Schmidt goto out; 3847d7728c96SJan Schmidt 3848718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3849718dc5faSOmar Sandoval size); 3850d7728c96SJan Schmidt if (ret) 3851d7728c96SJan Schmidt ret = -EFAULT; 3852d7728c96SJan Schmidt 3853d7728c96SJan Schmidt out: 3854d7728c96SJan Schmidt btrfs_free_path(path); 3855f54de068SDavid Sterba kvfree(inodes); 3856d24a67b2SZygo Blaxell out_loi: 3857d7728c96SJan Schmidt kfree(loi); 3858d7728c96SJan Schmidt 3859d7728c96SJan Schmidt return ret; 3860d7728c96SJan Schmidt } 3861d7728c96SJan Schmidt 3862008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3863c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3864c9e9f97bSIlya Dryomov { 3865c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3866c9e9f97bSIlya Dryomov 3867c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3868c9e9f97bSIlya Dryomov 38693009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3870837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3871837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3872837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3873a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3874a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3875837d5b6eSIlya Dryomov 3876c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3877c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3878c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 387919a39dceSIlya Dryomov 388019a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 388119a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 388219a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3883c9e9f97bSIlya Dryomov } 3884c9e9f97bSIlya Dryomov 38859ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3886c9e9f97bSIlya Dryomov { 3887496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3888c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3889c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3890c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3891ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3892c9e9f97bSIlya Dryomov int ret; 3893c9e9f97bSIlya Dryomov 3894c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3895c9e9f97bSIlya Dryomov return -EPERM; 3896c9e9f97bSIlya Dryomov 3897e54bfa31SLiu Bo ret = mnt_want_write_file(file); 38989ba1f6e4SLiu Bo if (ret) 38999ba1f6e4SLiu Bo return ret; 39009ba1f6e4SLiu Bo 3901ed0fb78fSIlya Dryomov again: 3902171938e5SDavid Sterba if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) { 3903c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3904ed0fb78fSIlya Dryomov need_unlock = true; 3905ed0fb78fSIlya Dryomov goto locked; 3906ed0fb78fSIlya Dryomov } 3907ed0fb78fSIlya Dryomov 3908ed0fb78fSIlya Dryomov /* 390901327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 3910ed0fb78fSIlya Dryomov * (1) some other op is running 3911ed0fb78fSIlya Dryomov * (2) balance is running 3912ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 3913ed0fb78fSIlya Dryomov */ 3914ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3915ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3916ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 39173009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3918ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3919dccdb07bSDavid Sterba /* 3920dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 3921dccdb07bSDavid Sterba * we'll reexamine the status again. 3922dccdb07bSDavid Sterba */ 3923ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 3924ed0fb78fSIlya Dryomov 3925ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 39263009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 3927ed0fb78fSIlya Dryomov /* this is (3) */ 3928ed0fb78fSIlya Dryomov need_unlock = false; 3929ed0fb78fSIlya Dryomov goto locked; 3930ed0fb78fSIlya Dryomov } 3931ed0fb78fSIlya Dryomov 3932ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3933ed0fb78fSIlya Dryomov goto again; 3934ed0fb78fSIlya Dryomov } else { 3935ed0fb78fSIlya Dryomov /* this is (2) */ 3936ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3937ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 3938ed0fb78fSIlya Dryomov goto out; 3939ed0fb78fSIlya Dryomov } 3940ed0fb78fSIlya Dryomov } else { 3941ed0fb78fSIlya Dryomov /* this is (1) */ 3942ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3943e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3944ed0fb78fSIlya Dryomov goto out; 3945ed0fb78fSIlya Dryomov } 3946ed0fb78fSIlya Dryomov 3947ed0fb78fSIlya Dryomov locked: 3948171938e5SDavid Sterba BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)); 3949c9e9f97bSIlya Dryomov 3950c9e9f97bSIlya Dryomov if (arg) { 3951c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 3952c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 3953c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 3954ed0fb78fSIlya Dryomov goto out_unlock; 3955c9e9f97bSIlya Dryomov } 3956de322263SIlya Dryomov 3957de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3958de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3959de322263SIlya Dryomov ret = -ENOTCONN; 3960de322263SIlya Dryomov goto out_bargs; 3961de322263SIlya Dryomov } 3962de322263SIlya Dryomov 3963de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3964de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3965de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3966de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3967de322263SIlya Dryomov 3968de322263SIlya Dryomov goto do_balance; 3969de322263SIlya Dryomov } 3970c9e9f97bSIlya Dryomov } else { 3971c9e9f97bSIlya Dryomov bargs = NULL; 3972c9e9f97bSIlya Dryomov } 3973c9e9f97bSIlya Dryomov 3974ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3975837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3976837d5b6eSIlya Dryomov goto out_bargs; 3977837d5b6eSIlya Dryomov } 3978837d5b6eSIlya Dryomov 39798d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3980c9e9f97bSIlya Dryomov if (!bctl) { 3981c9e9f97bSIlya Dryomov ret = -ENOMEM; 3982c9e9f97bSIlya Dryomov goto out_bargs; 3983c9e9f97bSIlya Dryomov } 3984c9e9f97bSIlya Dryomov 3985c9e9f97bSIlya Dryomov if (arg) { 3986c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3987c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3988c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3989c9e9f97bSIlya Dryomov 3990c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3991f43ffb60SIlya Dryomov } else { 3992f43ffb60SIlya Dryomov /* balance everything - no filters */ 3993f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 3994c9e9f97bSIlya Dryomov } 3995c9e9f97bSIlya Dryomov 39968eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 39978eb93459SDavid Sterba ret = -EINVAL; 39980f89abf5SChristian Engelmayer goto out_bctl; 39998eb93459SDavid Sterba } 40008eb93459SDavid Sterba 4001de322263SIlya Dryomov do_balance: 4002c9e9f97bSIlya Dryomov /* 4003149196a2SDavid Sterba * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to 4004149196a2SDavid Sterba * btrfs_balance. bctl is freed in reset_balance_state, or, if 4005149196a2SDavid Sterba * restriper was paused all the way until unmount, in free_fs_info. 4006149196a2SDavid Sterba * The flag should be cleared after reset_balance_state. 4007c9e9f97bSIlya Dryomov */ 4008ed0fb78fSIlya Dryomov need_unlock = false; 4009ed0fb78fSIlya Dryomov 40106fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 40110f89abf5SChristian Engelmayer bctl = NULL; 4012ed0fb78fSIlya Dryomov 4013d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4014c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4015c9e9f97bSIlya Dryomov ret = -EFAULT; 4016c9e9f97bSIlya Dryomov } 4017c9e9f97bSIlya Dryomov 40180f89abf5SChristian Engelmayer out_bctl: 40190f89abf5SChristian Engelmayer kfree(bctl); 4020c9e9f97bSIlya Dryomov out_bargs: 4021c9e9f97bSIlya Dryomov kfree(bargs); 4022ed0fb78fSIlya Dryomov out_unlock: 4023c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4024ed0fb78fSIlya Dryomov if (need_unlock) 4025171938e5SDavid Sterba clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags); 4026ed0fb78fSIlya Dryomov out: 4027e54bfa31SLiu Bo mnt_drop_write_file(file); 4028c9e9f97bSIlya Dryomov return ret; 4029c9e9f97bSIlya Dryomov } 4030c9e9f97bSIlya Dryomov 40312ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4032837d5b6eSIlya Dryomov { 4033837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4034837d5b6eSIlya Dryomov return -EPERM; 4035837d5b6eSIlya Dryomov 4036837d5b6eSIlya Dryomov switch (cmd) { 4037837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 40380b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4039a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 40400b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4041837d5b6eSIlya Dryomov } 4042837d5b6eSIlya Dryomov 4043837d5b6eSIlya Dryomov return -EINVAL; 4044837d5b6eSIlya Dryomov } 4045837d5b6eSIlya Dryomov 40462ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 404719a39dceSIlya Dryomov void __user *arg) 404819a39dceSIlya Dryomov { 404919a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 405019a39dceSIlya Dryomov int ret = 0; 405119a39dceSIlya Dryomov 405219a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 405319a39dceSIlya Dryomov return -EPERM; 405419a39dceSIlya Dryomov 405519a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 405619a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 405719a39dceSIlya Dryomov ret = -ENOTCONN; 405819a39dceSIlya Dryomov goto out; 405919a39dceSIlya Dryomov } 406019a39dceSIlya Dryomov 40618d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 406219a39dceSIlya Dryomov if (!bargs) { 406319a39dceSIlya Dryomov ret = -ENOMEM; 406419a39dceSIlya Dryomov goto out; 406519a39dceSIlya Dryomov } 406619a39dceSIlya Dryomov 4067008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 406819a39dceSIlya Dryomov 406919a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 407019a39dceSIlya Dryomov ret = -EFAULT; 407119a39dceSIlya Dryomov 407219a39dceSIlya Dryomov kfree(bargs); 407319a39dceSIlya Dryomov out: 407419a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 407519a39dceSIlya Dryomov return ret; 407619a39dceSIlya Dryomov } 407719a39dceSIlya Dryomov 4078905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 40795d13a37bSArne Jansen { 40800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 40810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 40825d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 40835d13a37bSArne Jansen int ret; 40845d13a37bSArne Jansen 40855d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 40865d13a37bSArne Jansen return -EPERM; 40875d13a37bSArne Jansen 4088905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4089905b0ddaSMiao Xie if (ret) 4090905b0ddaSMiao Xie return ret; 40915d13a37bSArne Jansen 40925d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4093905b0ddaSMiao Xie if (IS_ERR(sa)) { 4094905b0ddaSMiao Xie ret = PTR_ERR(sa); 4095905b0ddaSMiao Xie goto drop_write; 4096905b0ddaSMiao Xie } 40975d13a37bSArne Jansen 40980b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 40995d13a37bSArne Jansen 41005d13a37bSArne Jansen switch (sa->cmd) { 41015d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4102340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 41035d13a37bSArne Jansen break; 41045d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4105340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 41065d13a37bSArne Jansen break; 41075d13a37bSArne Jansen default: 41085d13a37bSArne Jansen ret = -EINVAL; 41095d13a37bSArne Jansen break; 41105d13a37bSArne Jansen } 41115d13a37bSArne Jansen 41125d13a37bSArne Jansen kfree(sa); 41130b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4114905b0ddaSMiao Xie drop_write: 4115905b0ddaSMiao Xie mnt_drop_write_file(file); 41165d13a37bSArne Jansen return ret; 41175d13a37bSArne Jansen } 41185d13a37bSArne Jansen 4119905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 41205d13a37bSArne Jansen { 41210b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41220b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41230b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41245d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 41255d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41265d13a37bSArne Jansen int ret; 41275d13a37bSArne Jansen int err; 41285d13a37bSArne Jansen 41295d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41305d13a37bSArne Jansen return -EPERM; 41315d13a37bSArne Jansen 4132905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4133905b0ddaSMiao Xie if (ret) 4134905b0ddaSMiao Xie return ret; 41355d13a37bSArne Jansen 41365d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4137905b0ddaSMiao Xie if (IS_ERR(sa)) { 4138905b0ddaSMiao Xie ret = PTR_ERR(sa); 4139905b0ddaSMiao Xie goto drop_write; 4140905b0ddaSMiao Xie } 41415d13a37bSArne Jansen 41425d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41435d13a37bSArne Jansen if (IS_ERR(trans)) { 41445d13a37bSArne Jansen ret = PTR_ERR(trans); 41455d13a37bSArne Jansen goto out; 41465d13a37bSArne Jansen } 41475d13a37bSArne Jansen 41485d13a37bSArne Jansen if (sa->assign) { 41499f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 41505d13a37bSArne Jansen } else { 415139616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 41525d13a37bSArne Jansen } 41535d13a37bSArne Jansen 4154e082f563SQu Wenruo /* update qgroup status and info */ 4155280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4156e082f563SQu Wenruo if (err < 0) 41570b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4158ad8403dfSAnand Jain "failed to update qgroup status and info"); 41593a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 41605d13a37bSArne Jansen if (err && !ret) 41615d13a37bSArne Jansen ret = err; 41625d13a37bSArne Jansen 41635d13a37bSArne Jansen out: 41645d13a37bSArne Jansen kfree(sa); 4165905b0ddaSMiao Xie drop_write: 4166905b0ddaSMiao Xie mnt_drop_write_file(file); 41675d13a37bSArne Jansen return ret; 41685d13a37bSArne Jansen } 41695d13a37bSArne Jansen 4170905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 41715d13a37bSArne Jansen { 41720b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41730b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41745d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 41755d13a37bSArne Jansen struct btrfs_trans_handle *trans; 41765d13a37bSArne Jansen int ret; 41775d13a37bSArne Jansen int err; 41785d13a37bSArne Jansen 41795d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41805d13a37bSArne Jansen return -EPERM; 41815d13a37bSArne Jansen 4182905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4183905b0ddaSMiao Xie if (ret) 4184905b0ddaSMiao Xie return ret; 41855d13a37bSArne Jansen 41865d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4187905b0ddaSMiao Xie if (IS_ERR(sa)) { 4188905b0ddaSMiao Xie ret = PTR_ERR(sa); 4189905b0ddaSMiao Xie goto drop_write; 4190905b0ddaSMiao Xie } 41915d13a37bSArne Jansen 4192d86e56cfSMiao Xie if (!sa->qgroupid) { 4193d86e56cfSMiao Xie ret = -EINVAL; 4194d86e56cfSMiao Xie goto out; 4195d86e56cfSMiao Xie } 4196d86e56cfSMiao Xie 41975d13a37bSArne Jansen trans = btrfs_join_transaction(root); 41985d13a37bSArne Jansen if (IS_ERR(trans)) { 41995d13a37bSArne Jansen ret = PTR_ERR(trans); 42005d13a37bSArne Jansen goto out; 42015d13a37bSArne Jansen } 42025d13a37bSArne Jansen 42035d13a37bSArne Jansen if (sa->create) { 420449a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 42055d13a37bSArne Jansen } else { 42063efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 42075d13a37bSArne Jansen } 42085d13a37bSArne Jansen 42093a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42105d13a37bSArne Jansen if (err && !ret) 42115d13a37bSArne Jansen ret = err; 42125d13a37bSArne Jansen 42135d13a37bSArne Jansen out: 42145d13a37bSArne Jansen kfree(sa); 4215905b0ddaSMiao Xie drop_write: 4216905b0ddaSMiao Xie mnt_drop_write_file(file); 42175d13a37bSArne Jansen return ret; 42185d13a37bSArne Jansen } 42195d13a37bSArne Jansen 4220905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 42215d13a37bSArne Jansen { 42220b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42230b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42245d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 42255d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42265d13a37bSArne Jansen int ret; 42275d13a37bSArne Jansen int err; 42285d13a37bSArne Jansen u64 qgroupid; 42295d13a37bSArne Jansen 42305d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42315d13a37bSArne Jansen return -EPERM; 42325d13a37bSArne Jansen 4233905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4234905b0ddaSMiao Xie if (ret) 4235905b0ddaSMiao Xie return ret; 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4238905b0ddaSMiao Xie if (IS_ERR(sa)) { 4239905b0ddaSMiao Xie ret = PTR_ERR(sa); 4240905b0ddaSMiao Xie goto drop_write; 4241905b0ddaSMiao Xie } 42425d13a37bSArne Jansen 42435d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42445d13a37bSArne Jansen if (IS_ERR(trans)) { 42455d13a37bSArne Jansen ret = PTR_ERR(trans); 42465d13a37bSArne Jansen goto out; 42475d13a37bSArne Jansen } 42485d13a37bSArne Jansen 42495d13a37bSArne Jansen qgroupid = sa->qgroupid; 42505d13a37bSArne Jansen if (!qgroupid) { 42515d13a37bSArne Jansen /* take the current subvol as qgroup */ 42525d13a37bSArne Jansen qgroupid = root->root_key.objectid; 42535d13a37bSArne Jansen } 42545d13a37bSArne Jansen 4255f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 42565d13a37bSArne Jansen 42573a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42585d13a37bSArne Jansen if (err && !ret) 42595d13a37bSArne Jansen ret = err; 42605d13a37bSArne Jansen 42615d13a37bSArne Jansen out: 42625d13a37bSArne Jansen kfree(sa); 4263905b0ddaSMiao Xie drop_write: 4264905b0ddaSMiao Xie mnt_drop_write_file(file); 42655d13a37bSArne Jansen return ret; 42665d13a37bSArne Jansen } 42675d13a37bSArne Jansen 42682f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 42692f232036SJan Schmidt { 42700b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42722f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 42732f232036SJan Schmidt int ret; 42742f232036SJan Schmidt 42752f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 42762f232036SJan Schmidt return -EPERM; 42772f232036SJan Schmidt 42782f232036SJan Schmidt ret = mnt_want_write_file(file); 42792f232036SJan Schmidt if (ret) 42802f232036SJan Schmidt return ret; 42812f232036SJan Schmidt 42822f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 42832f232036SJan Schmidt if (IS_ERR(qsa)) { 42842f232036SJan Schmidt ret = PTR_ERR(qsa); 42852f232036SJan Schmidt goto drop_write; 42862f232036SJan Schmidt } 42872f232036SJan Schmidt 42882f232036SJan Schmidt if (qsa->flags) { 42892f232036SJan Schmidt ret = -EINVAL; 42902f232036SJan Schmidt goto out; 42912f232036SJan Schmidt } 42922f232036SJan Schmidt 42930b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 42942f232036SJan Schmidt 42952f232036SJan Schmidt out: 42962f232036SJan Schmidt kfree(qsa); 42972f232036SJan Schmidt drop_write: 42982f232036SJan Schmidt mnt_drop_write_file(file); 42992f232036SJan Schmidt return ret; 43002f232036SJan Schmidt } 43012f232036SJan Schmidt 4302b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4303b929c1d8SMarcos Paulo de Souza void __user *arg) 43042f232036SJan Schmidt { 43052f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43062f232036SJan Schmidt int ret = 0; 43072f232036SJan Schmidt 43082f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43092f232036SJan Schmidt return -EPERM; 43102f232036SJan Schmidt 43118d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 43122f232036SJan Schmidt if (!qsa) 43132f232036SJan Schmidt return -ENOMEM; 43142f232036SJan Schmidt 43150b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 43162f232036SJan Schmidt qsa->flags = 1; 43170b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 43182f232036SJan Schmidt } 43192f232036SJan Schmidt 43202f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 43212f232036SJan Schmidt ret = -EFAULT; 43222f232036SJan Schmidt 43232f232036SJan Schmidt kfree(qsa); 43242f232036SJan Schmidt return ret; 43252f232036SJan Schmidt } 43262f232036SJan Schmidt 4327b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4328b929c1d8SMarcos Paulo de Souza void __user *arg) 432957254b6eSJan Schmidt { 433057254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 433157254b6eSJan Schmidt return -EPERM; 433257254b6eSJan Schmidt 43330b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 433457254b6eSJan Schmidt } 433557254b6eSJan Schmidt 4336abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4337abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 43388ea05e3aSAlexander Block { 4339496ad9aaSAl Viro struct inode *inode = file_inode(file); 43400b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43418ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 43428ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 43438ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 434495582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 43458ea05e3aSAlexander Block int ret = 0; 4346dd5f9615SStefan Behrens int received_uuid_changed; 43478ea05e3aSAlexander Block 4348bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4349bd60ea0fSDavid Sterba return -EPERM; 4350bd60ea0fSDavid Sterba 43518ea05e3aSAlexander Block ret = mnt_want_write_file(file); 43528ea05e3aSAlexander Block if (ret < 0) 43538ea05e3aSAlexander Block return ret; 43548ea05e3aSAlexander Block 43550b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 43568ea05e3aSAlexander Block 43574a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 43588ea05e3aSAlexander Block ret = -EINVAL; 43598ea05e3aSAlexander Block goto out; 43608ea05e3aSAlexander Block } 43618ea05e3aSAlexander Block 43628ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 43638ea05e3aSAlexander Block ret = -EROFS; 43648ea05e3aSAlexander Block goto out; 43658ea05e3aSAlexander Block } 43668ea05e3aSAlexander Block 4367dd5f9615SStefan Behrens /* 4368dd5f9615SStefan Behrens * 1 - root item 4369dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4370dd5f9615SStefan Behrens */ 4371dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 43728ea05e3aSAlexander Block if (IS_ERR(trans)) { 43738ea05e3aSAlexander Block ret = PTR_ERR(trans); 43748ea05e3aSAlexander Block trans = NULL; 43758ea05e3aSAlexander Block goto out; 43768ea05e3aSAlexander Block } 43778ea05e3aSAlexander Block 43788ea05e3aSAlexander Block sa->rtransid = trans->transid; 43798ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 43808ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 43818ea05e3aSAlexander Block 4382dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4383dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4384dd5f9615SStefan Behrens if (received_uuid_changed && 4385d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4386d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4387dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4388dd5f9615SStefan Behrens root->root_key.objectid); 4389d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4390d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4391d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4392d87ff758SNikolay Borisov goto out; 4393d87ff758SNikolay Borisov } 4394d87ff758SNikolay Borisov } 43958ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 43968ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 43978ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 43983cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 43993cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 44003cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 44013cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 44028ea05e3aSAlexander Block 44030b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 44048ea05e3aSAlexander Block &root->root_key, &root->root_item); 44058ea05e3aSAlexander Block if (ret < 0) { 44063a45bb20SJeff Mahoney btrfs_end_transaction(trans); 44078ea05e3aSAlexander Block goto out; 4408dd5f9615SStefan Behrens } 4409dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4410cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4411dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4412dd5f9615SStefan Behrens root->root_key.objectid); 4413dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 441466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4415efd38150SNikolay Borisov btrfs_end_transaction(trans); 4416dd5f9615SStefan Behrens goto out; 4417dd5f9615SStefan Behrens } 4418dd5f9615SStefan Behrens } 44193a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4420abccd00fSHugo Mills out: 44210b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4422abccd00fSHugo Mills mnt_drop_write_file(file); 4423abccd00fSHugo Mills return ret; 4424abccd00fSHugo Mills } 4425abccd00fSHugo Mills 4426abccd00fSHugo Mills #ifdef CONFIG_64BIT 4427abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4428abccd00fSHugo Mills void __user *arg) 4429abccd00fSHugo Mills { 4430abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4431abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4432abccd00fSHugo Mills int ret = 0; 4433abccd00fSHugo Mills 4434abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 44357b9ea627SShailendra Verma if (IS_ERR(args32)) 44367b9ea627SShailendra Verma return PTR_ERR(args32); 4437abccd00fSHugo Mills 44388d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 443984dbeb87SDan Carpenter if (!args64) { 444084dbeb87SDan Carpenter ret = -ENOMEM; 4441abccd00fSHugo Mills goto out; 4442abccd00fSHugo Mills } 4443abccd00fSHugo Mills 4444abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4445abccd00fSHugo Mills args64->stransid = args32->stransid; 4446abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4447abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4448abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4449abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4450abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4451abccd00fSHugo Mills args64->flags = args32->flags; 4452abccd00fSHugo Mills 4453abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4454abccd00fSHugo Mills if (ret) 4455abccd00fSHugo Mills goto out; 4456abccd00fSHugo Mills 4457abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4458abccd00fSHugo Mills args32->stransid = args64->stransid; 4459abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4460abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4461abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4462abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4463abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4464abccd00fSHugo Mills args32->flags = args64->flags; 4465abccd00fSHugo Mills 4466abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4467abccd00fSHugo Mills if (ret) 4468abccd00fSHugo Mills ret = -EFAULT; 4469abccd00fSHugo Mills 4470abccd00fSHugo Mills out: 4471abccd00fSHugo Mills kfree(args32); 4472abccd00fSHugo Mills kfree(args64); 4473abccd00fSHugo Mills return ret; 4474abccd00fSHugo Mills } 4475abccd00fSHugo Mills #endif 4476abccd00fSHugo Mills 4477abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4478abccd00fSHugo Mills void __user *arg) 4479abccd00fSHugo Mills { 4480abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4481abccd00fSHugo Mills int ret = 0; 4482abccd00fSHugo Mills 4483abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 44847b9ea627SShailendra Verma if (IS_ERR(sa)) 44857b9ea627SShailendra Verma return PTR_ERR(sa); 4486abccd00fSHugo Mills 4487abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4488abccd00fSHugo Mills 4489abccd00fSHugo Mills if (ret) 4490abccd00fSHugo Mills goto out; 4491abccd00fSHugo Mills 44928ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 44938ea05e3aSAlexander Block if (ret) 44948ea05e3aSAlexander Block ret = -EFAULT; 44958ea05e3aSAlexander Block 44968ea05e3aSAlexander Block out: 44978ea05e3aSAlexander Block kfree(sa); 44988ea05e3aSAlexander Block return ret; 44998ea05e3aSAlexander Block } 45008ea05e3aSAlexander Block 4501b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4502b929c1d8SMarcos Paulo de Souza void __user *arg) 4503867ab667Sjeff.liu { 4504a1b83ac5SAnand Jain size_t len; 4505867ab667Sjeff.liu int ret; 4506a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4507a1b83ac5SAnand Jain 45080b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 45090b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 45100b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4511a1b83ac5SAnand Jain 4512a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4513867ab667Sjeff.liu 4514867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 45150b246afaSJeff Mahoney btrfs_warn(fs_info, 45160b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 45170b246afaSJeff Mahoney --len); 4518867ab667Sjeff.liu } 4519867ab667Sjeff.liu 4520867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4521867ab667Sjeff.liu 4522867ab667Sjeff.liu return ret ? -EFAULT : 0; 4523867ab667Sjeff.liu } 4524867ab667Sjeff.liu 4525a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4526a8bfd4abSjeff.liu { 45270b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45280b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45290b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45300b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4531a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4532a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4533a8bfd4abSjeff.liu int ret; 4534a8bfd4abSjeff.liu 4535a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4536a8bfd4abSjeff.liu return -EPERM; 4537a8bfd4abSjeff.liu 4538a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4539a8bfd4abSjeff.liu return -EFAULT; 4540a8bfd4abSjeff.liu 4541a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 45420b246afaSJeff Mahoney btrfs_err(fs_info, 45435d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4544a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4545a8bfd4abSjeff.liu return -EINVAL; 4546a8bfd4abSjeff.liu } 4547a8bfd4abSjeff.liu 4548a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4549a8bfd4abSjeff.liu if (ret) 4550a8bfd4abSjeff.liu return ret; 4551a8bfd4abSjeff.liu 4552a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4553a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4554a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4555a8bfd4abSjeff.liu goto out_unlock; 4556a8bfd4abSjeff.liu } 4557a8bfd4abSjeff.liu 45580b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4559a8bfd4abSjeff.liu strcpy(super_block->label, label); 45600b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 45613a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4562a8bfd4abSjeff.liu 4563a8bfd4abSjeff.liu out_unlock: 4564a8bfd4abSjeff.liu mnt_drop_write_file(file); 4565a8bfd4abSjeff.liu return ret; 4566a8bfd4abSjeff.liu } 4567a8bfd4abSjeff.liu 45682eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 45692eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 45702eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 45712eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 45722eaa055fSJeff Mahoney 4573d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 45742eaa055fSJeff Mahoney { 45754d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 45762eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 45772eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 45782eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 45792eaa055fSJeff Mahoney }; 45802eaa055fSJeff Mahoney 45812eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45822eaa055fSJeff Mahoney return -EFAULT; 45832eaa055fSJeff Mahoney 45842eaa055fSJeff Mahoney return 0; 45852eaa055fSJeff Mahoney } 45862eaa055fSJeff Mahoney 4587b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4588b929c1d8SMarcos Paulo de Souza void __user *arg) 45892eaa055fSJeff Mahoney { 45900b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 45912eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 45922eaa055fSJeff Mahoney 45932eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 45942eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 45952eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 45962eaa055fSJeff Mahoney 45972eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 45982eaa055fSJeff Mahoney return -EFAULT; 45992eaa055fSJeff Mahoney 46002eaa055fSJeff Mahoney return 0; 46012eaa055fSJeff Mahoney } 46022eaa055fSJeff Mahoney 46032ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 46043b02a68aSJeff Mahoney enum btrfs_feature_set set, 46052eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 46062eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 46072eaa055fSJeff Mahoney { 4608f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 46093b02a68aSJeff Mahoney char *names; 46102eaa055fSJeff Mahoney u64 disallowed, unsupported; 46112eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 46122eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 46132eaa055fSJeff Mahoney 46142eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 46152eaa055fSJeff Mahoney if (unsupported) { 46163b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 46173b02a68aSJeff Mahoney if (names) { 46180b246afaSJeff Mahoney btrfs_warn(fs_info, 46193b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 46203b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46213b02a68aSJeff Mahoney kfree(names); 46223b02a68aSJeff Mahoney } else 46230b246afaSJeff Mahoney btrfs_warn(fs_info, 46242eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 46252eaa055fSJeff Mahoney type, unsupported); 46262eaa055fSJeff Mahoney return -EOPNOTSUPP; 46272eaa055fSJeff Mahoney } 46282eaa055fSJeff Mahoney 46292eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 46302eaa055fSJeff Mahoney if (disallowed) { 46313b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46323b02a68aSJeff Mahoney if (names) { 46330b246afaSJeff Mahoney btrfs_warn(fs_info, 46343b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 46353b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46363b02a68aSJeff Mahoney kfree(names); 46373b02a68aSJeff Mahoney } else 46380b246afaSJeff Mahoney btrfs_warn(fs_info, 46392eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 46402eaa055fSJeff Mahoney type, disallowed); 46412eaa055fSJeff Mahoney return -EPERM; 46422eaa055fSJeff Mahoney } 46432eaa055fSJeff Mahoney 46442eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 46452eaa055fSJeff Mahoney if (disallowed) { 46463b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 46473b02a68aSJeff Mahoney if (names) { 46480b246afaSJeff Mahoney btrfs_warn(fs_info, 46493b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 46503b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 46513b02a68aSJeff Mahoney kfree(names); 46523b02a68aSJeff Mahoney } else 46530b246afaSJeff Mahoney btrfs_warn(fs_info, 46542eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 46552eaa055fSJeff Mahoney type, disallowed); 46562eaa055fSJeff Mahoney return -EPERM; 46572eaa055fSJeff Mahoney } 46582eaa055fSJeff Mahoney 46592eaa055fSJeff Mahoney return 0; 46602eaa055fSJeff Mahoney } 46612eaa055fSJeff Mahoney 46622ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 46632ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 46642eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 46652eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 46662eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 46672eaa055fSJeff Mahoney 46682eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 46692eaa055fSJeff Mahoney { 46700b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46720b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46730b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46742eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 46752eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 46762eaa055fSJeff Mahoney u64 newflags; 46772eaa055fSJeff Mahoney int ret; 46782eaa055fSJeff Mahoney 46792eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 46802eaa055fSJeff Mahoney return -EPERM; 46812eaa055fSJeff Mahoney 46822eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 46832eaa055fSJeff Mahoney return -EFAULT; 46842eaa055fSJeff Mahoney 46852eaa055fSJeff Mahoney /* Nothing to do */ 46862eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 46872eaa055fSJeff Mahoney !flags[0].incompat_flags) 46882eaa055fSJeff Mahoney return 0; 46892eaa055fSJeff Mahoney 46902ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 46912eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 46922eaa055fSJeff Mahoney if (ret) 46932eaa055fSJeff Mahoney return ret; 46942eaa055fSJeff Mahoney 46952ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 46962eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 46972eaa055fSJeff Mahoney if (ret) 46982eaa055fSJeff Mahoney return ret; 46992eaa055fSJeff Mahoney 47002ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 47012eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 47022eaa055fSJeff Mahoney if (ret) 47032eaa055fSJeff Mahoney return ret; 47042eaa055fSJeff Mahoney 47057ab19625SDavid Sterba ret = mnt_want_write_file(file); 47067ab19625SDavid Sterba if (ret) 47077ab19625SDavid Sterba return ret; 47087ab19625SDavid Sterba 47098051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 47107ab19625SDavid Sterba if (IS_ERR(trans)) { 47117ab19625SDavid Sterba ret = PTR_ERR(trans); 47127ab19625SDavid Sterba goto out_drop_write; 47137ab19625SDavid Sterba } 47142eaa055fSJeff Mahoney 47150b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47162eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 47172eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 47182eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 47192eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 47202eaa055fSJeff Mahoney 47212eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 47222eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 47232eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 47242eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 47252eaa055fSJeff Mahoney 47262eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 47272eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 47282eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 47292eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 47300b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47312eaa055fSJeff Mahoney 47323a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 47337ab19625SDavid Sterba out_drop_write: 47347ab19625SDavid Sterba mnt_drop_write_file(file); 47357ab19625SDavid Sterba 47367ab19625SDavid Sterba return ret; 47372eaa055fSJeff Mahoney } 47382eaa055fSJeff Mahoney 47392351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 47402351f431SJosef Bacik { 47412351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 47422351f431SJosef Bacik int ret; 47432351f431SJosef Bacik 47442351f431SJosef Bacik if (compat) { 47452351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47462351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 47472351f431SJosef Bacik 47482351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 47492351f431SJosef Bacik if (ret) 47502351f431SJosef Bacik return -EFAULT; 47512351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 47522351f431SJosef Bacik if (!arg) 47532351f431SJosef Bacik return -ENOMEM; 47542351f431SJosef Bacik arg->send_fd = args32.send_fd; 47552351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 47562351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 47572351f431SJosef Bacik arg->parent_root = args32.parent_root; 47582351f431SJosef Bacik arg->flags = args32.flags; 47592351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 47602351f431SJosef Bacik sizeof(args32.reserved)); 47612351f431SJosef Bacik #else 47622351f431SJosef Bacik return -ENOTTY; 47632351f431SJosef Bacik #endif 47642351f431SJosef Bacik } else { 47652351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 47662351f431SJosef Bacik if (IS_ERR(arg)) 47672351f431SJosef Bacik return PTR_ERR(arg); 47682351f431SJosef Bacik } 47692351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 47702351f431SJosef Bacik kfree(arg); 47712351f431SJosef Bacik return ret; 47722351f431SJosef Bacik } 47732351f431SJosef Bacik 4774f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4775f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4776f46b5a66SChristoph Hellwig { 47770b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47790b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47804bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4781f46b5a66SChristoph Hellwig 4782f46b5a66SChristoph Hellwig switch (cmd) { 47836cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 47846cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 47856cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 47866cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 47876cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 47886cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 478940cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4790b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 479140cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 479240cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4793f7039b1dSLi Dongyang case FITRIM: 4794b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4795f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4796fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4797fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4798fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 47993de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4800fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 48016f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 48026f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 480376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4804949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4805949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4806949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 48070caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 48080caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 48090caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 48100caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 48116ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 48126ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4813f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 48141e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 48151e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 48161e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4817f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4818198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4819f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 48202ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4821f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4822da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 48236b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 48246b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4825475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 48262ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4827475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 48282ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4829f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 48309ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4831ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4832ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4833cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4834cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4835ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4836ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4837d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4838d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4839d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4840d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4841d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4842d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 48431406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 48442ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 48459b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 48469b199859SFilipe David Borba Manana int ret; 48479b199859SFilipe David Borba Manana 484882b3e53bSNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, -1); 48499b199859SFilipe David Borba Manana if (ret) 48509b199859SFilipe David Borba Manana return ret; 48510b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 48522fad4e83SDavid Sterba /* 48532fad4e83SDavid Sterba * The transaction thread may want to do more work, 485401327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 48552fad4e83SDavid Sterba * processing uncleaned subvols. 48562fad4e83SDavid Sterba */ 48570b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 48589b199859SFilipe David Borba Manana return ret; 48599b199859SFilipe David Borba Manana } 486046204592SSage Weil case BTRFS_IOC_START_SYNC: 48619a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 486246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 48632ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4864475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4865b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4866475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 48672ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4868475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 48692ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4870c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 48719ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4872837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 48732ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 487419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 48752ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 48768ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 48778ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4878abccd00fSHugo Mills #ifdef CONFIG_64BIT 4879abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4880abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4881abccd00fSHugo Mills #endif 488231db9f7cSAlexander Block case BTRFS_IOC_SEND: 48832351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 48842351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48852351f431SJosef Bacik case BTRFS_IOC_SEND_32: 48862351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 48872351f431SJosef Bacik #endif 4888c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 48892ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 48905d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4891905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 48925d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4893905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 48945d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4895905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 48965d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4897905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 48982f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 48992f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 49002f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4901b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 490257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4903b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 49043f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 49052ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 49062eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4907d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 49082eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4909b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 49102eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 49112eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4912e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 4913e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 4914025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 4915025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 4916b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 4917b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 491842e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 491942e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 492023d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 492123d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 4922f46b5a66SChristoph Hellwig } 4923f46b5a66SChristoph Hellwig 4924f46b5a66SChristoph Hellwig return -ENOTTY; 4925f46b5a66SChristoph Hellwig } 49264c63c245SLuke Dashjr 49274c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 49284c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 49294c63c245SLuke Dashjr { 49302a362249SJeff Mahoney /* 49312a362249SJeff Mahoney * These all access 32-bit values anyway so no further 49322a362249SJeff Mahoney * handling is necessary. 49332a362249SJeff Mahoney */ 49344c63c245SLuke Dashjr switch (cmd) { 49354c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 49364c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 49374c63c245SLuke Dashjr break; 49384c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 49394c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 49404c63c245SLuke Dashjr break; 49414c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 49424c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 49434c63c245SLuke Dashjr break; 49444c63c245SLuke Dashjr } 49454c63c245SLuke Dashjr 49464c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 49474c63c245SLuke Dashjr } 49484c63c245SLuke Dashjr #endif 4949