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> 2997fc2977SMiklos Szeredi #include <linux/fileattr.h> 3014605409SBoris Burkov #include <linux/fsverity.h> 311881fba8SOmar Sandoval #include <linux/sched/xacct.h> 32f46b5a66SChristoph Hellwig #include "ctree.h" 33f46b5a66SChristoph Hellwig #include "disk-io.h" 34949964c9SMarcos Paulo de Souza #include "export.h" 35f46b5a66SChristoph Hellwig #include "transaction.h" 36f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 37f46b5a66SChristoph Hellwig #include "print-tree.h" 38f46b5a66SChristoph Hellwig #include "volumes.h" 39925baeddSChris Mason #include "locking.h" 40d7728c96SJan Schmidt #include "backref.h" 41606686eeSJosef Bacik #include "rcu-string.h" 4231db9f7cSAlexander Block #include "send.h" 433f6bcfbdSStefan Behrens #include "dev-replace.h" 4463541927SFilipe David Borba Manana #include "props.h" 453b02a68aSJeff Mahoney #include "sysfs.h" 46fcebe456SJosef Bacik #include "qgroup.h" 471ec9a1aeSFilipe Manana #include "tree-log.h" 48ebb8765bSAnand Jain #include "compression.h" 498719aaaeSJosef Bacik #include "space-info.h" 5086736342SJosef Bacik #include "delalloc-space.h" 51aac0023cSJosef Bacik #include "block-group.h" 5222b398eeSQu Wenruo #include "subpage.h" 53c7f13d42SJosef Bacik #include "fs.h" 5407e81dc9SJosef Bacik #include "accessors.h" 55a0231804SJosef Bacik #include "extent-tree.h" 5645c40c8fSJosef Bacik #include "root-tree.h" 5759b818e0SJosef Bacik #include "defrag.h" 58f2b39277SJosef Bacik #include "dir-item.h" 59c7a03b52SJosef Bacik #include "uuid-tree.h" 607572dec8SJosef Bacik #include "ioctl.h" 61af142b6fSJosef Bacik #include "file.h" 622fc6822cSJosef Bacik #include "scrub.h" 63c03b2207SJosef Bacik #include "super.h" 64f46b5a66SChristoph Hellwig 65abccd00fSHugo Mills #ifdef CONFIG_64BIT 66abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 67abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 68abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 69abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 70abccd00fSHugo Mills */ 71abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 72abccd00fSHugo Mills __u64 sec; 73abccd00fSHugo Mills __u32 nsec; 74abccd00fSHugo Mills } __attribute__ ((__packed__)); 75abccd00fSHugo Mills 76abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 77abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 78abccd00fSHugo Mills __u64 stransid; /* in */ 79abccd00fSHugo Mills __u64 rtransid; /* out */ 80abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 81abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 82abccd00fSHugo Mills __u64 flags; /* in */ 83abccd00fSHugo Mills __u64 reserved[16]; /* in */ 84abccd00fSHugo Mills } __attribute__ ((__packed__)); 85abccd00fSHugo Mills 86abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 87abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 88abccd00fSHugo Mills #endif 89abccd00fSHugo Mills 902351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 912351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 922351f431SJosef Bacik __s64 send_fd; /* in */ 932351f431SJosef Bacik __u64 clone_sources_count; /* in */ 942351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 952351f431SJosef Bacik __u64 parent_root; /* in */ 962351f431SJosef Bacik __u64 flags; /* in */ 97e77fbf99SDavid Sterba __u32 version; /* in */ 98e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 992351f431SJosef Bacik } __attribute__ ((__packed__)); 1002351f431SJosef Bacik 1012351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 1022351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 1031881fba8SOmar Sandoval 1041881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 { 1051881fba8SOmar Sandoval compat_uptr_t iov; 1061881fba8SOmar Sandoval compat_ulong_t iovcnt; 1071881fba8SOmar Sandoval __s64 offset; 1081881fba8SOmar Sandoval __u64 flags; 1091881fba8SOmar Sandoval __u64 len; 1101881fba8SOmar Sandoval __u64 unencoded_len; 1111881fba8SOmar Sandoval __u64 unencoded_offset; 1121881fba8SOmar Sandoval __u32 compression; 1131881fba8SOmar Sandoval __u32 encryption; 1141881fba8SOmar Sandoval __u8 reserved[64]; 1151881fba8SOmar Sandoval }; 1161881fba8SOmar Sandoval 1171881fba8SOmar Sandoval #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ 1181881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1197c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 1207c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1212351f431SJosef Bacik #endif 122abccd00fSHugo Mills 1236cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 1241905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 1251905a0f7SDavid Sterba unsigned int flags) 1266cbff00fSChristoph Hellwig { 1271905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 1286cbff00fSChristoph Hellwig return flags; 1291905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1306cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1316cbff00fSChristoph Hellwig else 1326cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1336cbff00fSChristoph Hellwig } 134f46b5a66SChristoph Hellwig 1356cbff00fSChristoph Hellwig /* 136a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 137a157d4fdSDavid Sterba * ioctl. 1386cbff00fSChristoph Hellwig */ 13977eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1406cbff00fSChristoph Hellwig { 1416cbff00fSChristoph Hellwig unsigned int iflags = 0; 14277eea05eSBoris Burkov u32 flags = binode->flags; 14314605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1446cbff00fSChristoph Hellwig 1456cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1466cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1476cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1486cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1496cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1506cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1516cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1526cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1536cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1546cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1556cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1566cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 157d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 158d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 15914605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 16014605409SBoris Burkov iflags |= FS_VERITY_FL; 161d0092bddSLi Zefan 16213f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 163d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 16413f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 16513f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1666cbff00fSChristoph Hellwig 1676cbff00fSChristoph Hellwig return iflags; 1686cbff00fSChristoph Hellwig } 1696cbff00fSChristoph Hellwig 1706cbff00fSChristoph Hellwig /* 1716cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1726cbff00fSChristoph Hellwig */ 1737b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1746cbff00fSChristoph Hellwig { 1755c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1763cc79392SFilipe Manana unsigned int new_fl = 0; 1776cbff00fSChristoph Hellwig 1785c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1793cc79392SFilipe Manana new_fl |= S_SYNC; 1805c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1813cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1825c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1833cc79392SFilipe Manana new_fl |= S_APPEND; 1845c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1853cc79392SFilipe Manana new_fl |= S_NOATIME; 1865c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1873cc79392SFilipe Manana new_fl |= S_DIRSYNC; 18814605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 18914605409SBoris Burkov new_fl |= S_VERITY; 1903cc79392SFilipe Manana 1913cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 19214605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 19314605409SBoris Burkov S_VERITY, new_fl); 1946cbff00fSChristoph Hellwig } 1956cbff00fSChristoph Hellwig 196f37c563bSDavid Sterba /* 197f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 198f37c563bSDavid Sterba * the old and new flags are not conflicting 199f37c563bSDavid Sterba */ 200f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 20175e7cb7fSLiu Bo { 20275e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 20375e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 20475e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 205e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 206e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20775e7cb7fSLiu Bo return -EOPNOTSUPP; 20875e7cb7fSLiu Bo 209f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 21075e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 21175e7cb7fSLiu Bo return -EINVAL; 21275e7cb7fSLiu Bo 213f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 214f37c563bSDavid Sterba return -EINVAL; 215f37c563bSDavid Sterba 216f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 217f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 218f37c563bSDavid Sterba return -EINVAL; 219f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 220f37c563bSDavid Sterba return -EINVAL; 221f37c563bSDavid Sterba 22275e7cb7fSLiu Bo return 0; 22375e7cb7fSLiu Bo } 22475e7cb7fSLiu Bo 225d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 226d206e9c9SNaohiro Aota unsigned int flags) 227d206e9c9SNaohiro Aota { 228d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 229d206e9c9SNaohiro Aota return -EPERM; 230d206e9c9SNaohiro Aota 231d206e9c9SNaohiro Aota return 0; 232d206e9c9SNaohiro Aota } 233d206e9c9SNaohiro Aota 23497fc2977SMiklos Szeredi /* 23597fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 23697fc2977SMiklos Szeredi * fsxattr are zeroed. 23797fc2977SMiklos Szeredi */ 23897fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2396cbff00fSChristoph Hellwig { 24097fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 24197fc2977SMiklos Szeredi 24277eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 24397fc2977SMiklos Szeredi return 0; 24497fc2977SMiklos Szeredi } 24597fc2977SMiklos Szeredi 2468782a9aeSChristian Brauner int btrfs_fileattr_set(struct mnt_idmap *idmap, 24797fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 24897fc2977SMiklos Szeredi { 24997fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2515c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2525c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2536cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2545aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2556cbff00fSChristoph Hellwig int ret; 256ff9fef55SAnand Jain const char *comp = NULL; 257f37c563bSDavid Sterba u32 binode_flags; 2586cbff00fSChristoph Hellwig 259b83cc969SLi Zefan if (btrfs_root_readonly(root)) 260b83cc969SLi Zefan return -EROFS; 261b83cc969SLi Zefan 26297fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 26397fc2977SMiklos Szeredi return -EOPNOTSUPP; 2646cbff00fSChristoph Hellwig 26597fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 26677eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 26797fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 268e7848683SJan Kara if (ret) 269e7848683SJan Kara return ret; 270e7848683SJan Kara 271d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 272d206e9c9SNaohiro Aota if (ret) 27397fc2977SMiklos Szeredi return ret; 274d206e9c9SNaohiro Aota 275f37c563bSDavid Sterba binode_flags = binode->flags; 2765c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 277d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2786cbff00fSChristoph Hellwig else 279d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2805c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 281d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2826cbff00fSChristoph Hellwig else 283d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2845c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 285d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2866cbff00fSChristoph Hellwig else 287d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2885c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 289d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2906cbff00fSChristoph Hellwig else 291d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2925c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 293d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2946cbff00fSChristoph Hellwig else 295d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 29697fc2977SMiklos Szeredi 29797fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 29897fc2977SMiklos Szeredi if (!fa->flags_valid) { 29997fc2977SMiklos Szeredi /* 1 item for the inode */ 30097fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 3019b8a233bSRitesh Harjani if (IS_ERR(trans)) 3029b8a233bSRitesh Harjani return PTR_ERR(trans); 30397fc2977SMiklos Szeredi goto update_flags; 30497fc2977SMiklos Szeredi } 30597fc2977SMiklos Szeredi 3065c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 307d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 3086cbff00fSChristoph Hellwig else 309d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 3105c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 31144e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3127e97b8daSDavid Sterba /* 3137e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 3147e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 3157e97b8daSDavid Sterba * status of the file and will not set it. 3167e97b8daSDavid Sterba */ 3177e97b8daSDavid Sterba if (inode->i_size == 0) 318d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 319d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 3207e97b8daSDavid Sterba } else { 321d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 3227e97b8daSDavid Sterba } 3237e97b8daSDavid Sterba } else { 3247e97b8daSDavid Sterba /* 32501327610SNicholas D Steeves * Revert back under same assumptions as above 3267e97b8daSDavid Sterba */ 32744e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3287e97b8daSDavid Sterba if (inode->i_size == 0) 329d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 330d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3317e97b8daSDavid Sterba } else { 332d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3337e97b8daSDavid Sterba } 3347e97b8daSDavid Sterba } 3356cbff00fSChristoph Hellwig 33675e7cb7fSLiu Bo /* 33775e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 33875e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 33975e7cb7fSLiu Bo * things smaller. 34075e7cb7fSLiu Bo */ 3415c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 342d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 343d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3445c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 34563541927SFilipe David Borba Manana 34697fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 34797fc2977SMiklos Szeredi return -ETXTBSY; 348eede2bf3SOmar Sandoval 349d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 350d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 35163541927SFilipe David Borba Manana 35293370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 35393370509SDavid Sterba if (!comp || comp[0] == 0) 35493370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 355ebcb904dSLi Zefan } else { 356d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 35775e7cb7fSLiu Bo } 3586cbff00fSChristoph Hellwig 359ff9fef55SAnand Jain /* 360ff9fef55SAnand Jain * 1 for inode item 361ff9fef55SAnand Jain * 2 for properties 362ff9fef55SAnand Jain */ 363ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 36497fc2977SMiklos Szeredi if (IS_ERR(trans)) 36597fc2977SMiklos Szeredi return PTR_ERR(trans); 3666cbff00fSChristoph Hellwig 367ff9fef55SAnand Jain if (comp) { 368ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 369ff9fef55SAnand Jain strlen(comp), 0); 370ff9fef55SAnand Jain if (ret) { 371ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 372ff9fef55SAnand Jain goto out_end_trans; 373ff9fef55SAnand Jain } 374ff9fef55SAnand Jain } else { 375ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 376ff9fef55SAnand Jain 0, 0); 377ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 378ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 379ff9fef55SAnand Jain goto out_end_trans; 380ff9fef55SAnand Jain } 381ff9fef55SAnand Jain } 382ff9fef55SAnand Jain 38397fc2977SMiklos Szeredi update_flags: 384d2b8fcfeSAnand Jain binode->flags = binode_flags; 3857b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3860c4d2d95SJosef Bacik inode_inc_iversion(inode); 3872a9462deSJeff Layton inode_set_ctime_current(inode); 3889a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3896cbff00fSChristoph Hellwig 390ff9fef55SAnand Jain out_end_trans: 3913a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3922d4e6f6aSliubo return ret; 3936cbff00fSChristoph Hellwig } 3946cbff00fSChristoph Hellwig 3950d7ed32cSDavid Sterba /* 3960d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3970d7ed32cSDavid Sterba */ 398c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 399c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 400c3e1f96cSGoldwyn Rodrigues { 4010d7ed32cSDavid Sterba bool ret = false; 4020d7ed32cSDavid Sterba 4030d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 4040d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 4050d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 4060d7ed32cSDavid Sterba ret = true; 4070d7ed32cSDavid Sterba } 4080d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 4090d7ed32cSDavid Sterba 4100d7ed32cSDavid Sterba return ret; 411c3e1f96cSGoldwyn Rodrigues } 412c3e1f96cSGoldwyn Rodrigues 413578bda9eSDavid Sterba /* 414578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 415578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 416578bda9eSDavid Sterba * btrfs_exclop_finish. 417578bda9eSDavid Sterba * 418578bda9eSDavid Sterba * Compatibility: 419578bda9eSDavid Sterba * - the same type is already running 420621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 421578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 422578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 423578bda9eSDavid Sterba */ 424578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 425578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 426578bda9eSDavid Sterba { 427578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 428621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 429621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 430621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 431578bda9eSDavid Sterba return true; 432578bda9eSDavid Sterba 433578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 434578bda9eSDavid Sterba return false; 435578bda9eSDavid Sterba } 436578bda9eSDavid Sterba 437578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 438578bda9eSDavid Sterba { 439578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 440578bda9eSDavid Sterba } 441578bda9eSDavid Sterba 442c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 443c3e1f96cSGoldwyn Rodrigues { 4440d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 445c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4460d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 44766a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 448c3e1f96cSGoldwyn Rodrigues } 449c3e1f96cSGoldwyn Rodrigues 450efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 451efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 452efc0e69cSNikolay Borisov { 453efc0e69cSNikolay Borisov switch (op) { 454efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 455efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 456efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 457ac868bc9Sxiaoshoukui fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD || 458ac868bc9Sxiaoshoukui fs_info->exclusive_operation == BTRFS_EXCLOP_NONE || 459ac868bc9Sxiaoshoukui fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 460efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 461efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 462efc0e69cSNikolay Borisov break; 463efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 464efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 465efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 466efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 467efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 468efc0e69cSNikolay Borisov break; 469efc0e69cSNikolay Borisov default: 470efc0e69cSNikolay Borisov btrfs_warn(fs_info, 471efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 472efc0e69cSNikolay Borisov } 473efc0e69cSNikolay Borisov } 474efc0e69cSNikolay Borisov 475dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4766cbff00fSChristoph Hellwig { 4776cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4786cbff00fSChristoph Hellwig } 479f46b5a66SChristoph Hellwig 480b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 481b929c1d8SMarcos Paulo de Souza void __user *arg) 482f7039b1dSLi Dongyang { 483f7039b1dSLi Dongyang struct btrfs_device *device; 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 /* 4931cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4941cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4951cb3dc3fSNaohiro Aota * filesystem for now. 4961cb3dc3fSNaohiro Aota */ 4971cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4981cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4991cb3dc3fSNaohiro Aota 5001cb3dc3fSNaohiro Aota /* 501f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 502f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 503f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 504f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 505f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 506f35f06c3SFilipe Manana */ 507f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 508f35f06c3SFilipe Manana return -EROFS; 509f35f06c3SFilipe Manana 5101f78160cSXiao Guangrong rcu_read_lock(); 5111f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5121f78160cSXiao Guangrong dev_list) { 5137b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 514f7039b1dSLi Dongyang continue; 515f7039b1dSLi Dongyang num_devices++; 5167b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 517f7039b1dSLi Dongyang minlen); 518f7039b1dSLi Dongyang } 5191f78160cSXiao Guangrong rcu_read_unlock(); 520f4c697e6SLukas Czerner 521f7039b1dSLi Dongyang if (!num_devices) 522f7039b1dSLi Dongyang return -EOPNOTSUPP; 523f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 524f7039b1dSLi Dongyang return -EFAULT; 5256ba9fc8eSQu Wenruo 5266ba9fc8eSQu Wenruo /* 5276ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5286ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5296ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5306ba9fc8eSQu Wenruo */ 5316ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 532f4c697e6SLukas Czerner return -EINVAL; 533f7039b1dSLi Dongyang 534f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5352ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 536f7039b1dSLi Dongyang if (ret < 0) 537f7039b1dSLi Dongyang return ret; 538f7039b1dSLi Dongyang 539f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 540f7039b1dSLi Dongyang return -EFAULT; 541f7039b1dSLi Dongyang 542f7039b1dSLi Dongyang return 0; 543f7039b1dSLi Dongyang } 544f7039b1dSLi Dongyang 545e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 546dd5f9615SStefan Behrens { 54746e0f66aSChris Mason int i; 54846e0f66aSChris Mason 54946e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 55046e0f66aSChris Mason if (uuid[i]) 55146e0f66aSChris Mason return 0; 55246e0f66aSChris Mason } 55346e0f66aSChris Mason return 1; 554dd5f9615SStefan Behrens } 555dd5f9615SStefan Behrens 5563538d68dSOmar Sandoval /* 5573538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5583538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5593538d68dSOmar Sandoval */ 5603538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5613538d68dSOmar Sandoval { 5623538d68dSOmar Sandoval /* 5633538d68dSOmar Sandoval * 1 to add root block 5643538d68dSOmar Sandoval * 1 to add root item 5653538d68dSOmar Sandoval * 1 to add root ref 5663538d68dSOmar Sandoval * 1 to add root backref 5673538d68dSOmar Sandoval * 1 to add UUID item 5683538d68dSOmar Sandoval * 1 to add qgroup info 5693538d68dSOmar Sandoval * 1 to add qgroup limit 5703538d68dSOmar Sandoval * 5713538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5723538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5733538d68dSOmar Sandoval */ 5743538d68dSOmar Sandoval unsigned int num_items = 7; 5753538d68dSOmar Sandoval 5763538d68dSOmar Sandoval if (inherit) { 5773538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5783538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5793538d68dSOmar Sandoval } 5803538d68dSOmar Sandoval return num_items; 5813538d68dSOmar Sandoval } 5823538d68dSOmar Sandoval 583f2d40141SChristian Brauner static noinline int create_subvol(struct mnt_idmap *idmap, 5844d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5858696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 586f46b5a66SChristoph Hellwig { 5870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 588f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 589f46b5a66SChristoph Hellwig struct btrfs_key key; 59049a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 591f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 592f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 593d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 59476dda93cSYan, Zheng struct btrfs_root *new_root; 595d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 59695582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5973538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5983538d68dSOmar Sandoval .dir = dir, 5993538d68dSOmar Sandoval .dentry = dentry, 6003538d68dSOmar Sandoval .subvol = true, 6013538d68dSOmar Sandoval }; 6023538d68dSOmar Sandoval unsigned int trans_num_items; 603f46b5a66SChristoph Hellwig int ret; 6042256e901SOmar Sandoval dev_t anon_dev; 605f46b5a66SChristoph Hellwig u64 objectid; 606f46b5a66SChristoph Hellwig 60749a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 60849a3c4d9SDavid Sterba if (!root_item) 60949a3c4d9SDavid Sterba return -ENOMEM; 61049a3c4d9SDavid Sterba 611543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6122fbe8c8aSAl Viro if (ret) 6132256e901SOmar Sandoval goto out_root_item; 6142dfb1e43SQu Wenruo 615e09fe2d2SQu Wenruo /* 616e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 61701327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 618e09fe2d2SQu Wenruo */ 61949a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 62049a3c4d9SDavid Sterba ret = -ENOSPC; 6212256e901SOmar Sandoval goto out_root_item; 62249a3c4d9SDavid Sterba } 623e09fe2d2SQu Wenruo 6242256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6252256e901SOmar Sandoval if (ret < 0) 6262256e901SOmar Sandoval goto out_root_item; 6272256e901SOmar Sandoval 628f2d40141SChristian Brauner new_inode_args.inode = btrfs_new_subvol_inode(idmap, dir); 6293538d68dSOmar Sandoval if (!new_inode_args.inode) { 630a1fd0c35SOmar Sandoval ret = -ENOMEM; 631a1fd0c35SOmar Sandoval goto out_anon_dev; 632a1fd0c35SOmar Sandoval } 6333538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 634d5c12070SMiao Xie if (ret) 635a1fd0c35SOmar Sandoval goto out_inode; 6363538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6373538d68dSOmar Sandoval 6383538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6393538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6403538d68dSOmar Sandoval trans_num_items, false); 6413538d68dSOmar Sandoval if (ret) 6423538d68dSOmar Sandoval goto out_new_inode_args; 643f46b5a66SChristoph Hellwig 644d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 645d5c12070SMiao Xie if (IS_ERR(trans)) { 646d5c12070SMiao Xie ret = PTR_ERR(trans); 647e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6483538d68dSOmar Sandoval goto out_new_inode_args; 649d5c12070SMiao Xie } 650d5c12070SMiao Xie trans->block_rsv = &block_rsv; 651d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 6521b53e51aSSweet Tea Dorminy /* Tree log can't currently deal with an inode which is a new root. */ 6531b53e51aSSweet Tea Dorminy btrfs_set_log_full_commit(trans); 654f46b5a66SChristoph Hellwig 655a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6566f72c7e2SArne Jansen if (ret) 6572256e901SOmar Sandoval goto out; 6586f72c7e2SArne Jansen 6599631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6609631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6618e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6628e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6632256e901SOmar Sandoval goto out; 6648e8a1e31SJosef Bacik } 665f46b5a66SChristoph Hellwig 666d5e09e38SFilipe Manana btrfs_mark_buffer_dirty(trans, leaf); 667f46b5a66SChristoph Hellwig 66849a3c4d9SDavid Sterba inode_item = &root_item->inode; 6693cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6703cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6713cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 672da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6730b246afaSJeff Mahoney fs_info->nodesize); 6743cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 675f46b5a66SChristoph Hellwig 67649a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 67749a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6783cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 67908fe4db1SLi Zefan 68049a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 68149a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 68249a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 68349a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 68449a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68549a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 686f46b5a66SChristoph Hellwig 68749a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 68849a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 689807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 69049a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 69149a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 69249a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 69349a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 69449a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 695f46b5a66SChristoph Hellwig 696925baeddSChris Mason btrfs_tree_unlock(leaf); 697f46b5a66SChristoph Hellwig 69869948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 699f46b5a66SChristoph Hellwig 700f46b5a66SChristoph Hellwig key.objectid = objectid; 7015d4f98a2SYan Zheng key.offset = 0; 702962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7030b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70449a3c4d9SDavid Sterba root_item); 70567addf29SFilipe Manana if (ret) { 70667addf29SFilipe Manana /* 70767addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 70867addf29SFilipe Manana * tree block so that we don't leak space and leave the 70967addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 7107a163608SFilipe Manana * extent tree with a backreference for a root that does not 711212a58fdSFilipe Manana * exists). 71267addf29SFilipe Manana */ 713212a58fdSFilipe Manana btrfs_tree_lock(leaf); 714190a8339SJosef Bacik btrfs_clear_buffer_dirty(trans, leaf); 715212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7167a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 71767addf29SFilipe Manana free_extent_buffer(leaf); 7182256e901SOmar Sandoval goto out; 71967addf29SFilipe Manana } 72067addf29SFilipe Manana 72167addf29SFilipe Manana free_extent_buffer(leaf); 72267addf29SFilipe Manana leaf = NULL; 723f46b5a66SChristoph Hellwig 7242dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 72579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 72679787eaaSJeff Mahoney ret = PTR_ERR(new_root); 72766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7282256e901SOmar Sandoval goto out; 72979787eaaSJeff Mahoney } 7302256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7312dfb1e43SQu Wenruo anon_dev = 0; 7323538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7333538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 73476dda93cSYan, Zheng 735221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 736221581e4SJosef Bacik if (ret) { 737221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7382256e901SOmar Sandoval goto out; 739c7e54b51SJosef Bacik } 7400660b5afSChris Mason 741cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7426bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 743caae78e0SOmar Sandoval if (ret) { 74466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 745caae78e0SOmar Sandoval goto out; 746caae78e0SOmar Sandoval } 747dd5f9615SStefan Behrens 748caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 749caae78e0SOmar Sandoval if (ret) { 750caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 751caae78e0SOmar Sandoval goto out; 752caae78e0SOmar Sandoval } 753caae78e0SOmar Sandoval 754caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 755caae78e0SOmar Sandoval new_inode_args.inode = NULL; 756f46b5a66SChristoph Hellwig 7572256e901SOmar Sandoval out: 758d5c12070SMiao Xie trans->block_rsv = NULL; 759d5c12070SMiao Xie trans->bytes_reserved = 0; 760e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 761de6e8200SLiu Bo 7621b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7633538d68dSOmar Sandoval out_new_inode_args: 7643538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 765a1fd0c35SOmar Sandoval out_inode: 7663538d68dSOmar Sandoval iput(new_inode_args.inode); 7672256e901SOmar Sandoval out_anon_dev: 7682dfb1e43SQu Wenruo if (anon_dev) 7692dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7702256e901SOmar Sandoval out_root_item: 77149a3c4d9SDavid Sterba kfree(root_item); 77249a3c4d9SDavid Sterba return ret; 773f46b5a66SChristoph Hellwig } 774f46b5a66SChristoph Hellwig 775e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7769babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 777e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 778f46b5a66SChristoph Hellwig { 7790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7802e4bfab9SYan, Zheng struct inode *inode; 781f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7823538d68dSOmar Sandoval unsigned int trans_num_items; 783f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7842e4bfab9SYan, Zheng int ret; 785f46b5a66SChristoph Hellwig 786813febdbSJosef Bacik /* We do not support snapshotting right now. */ 787813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 788813febdbSJosef Bacik btrfs_warn(fs_info, 789813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 790813febdbSJosef Bacik return -EOPNOTSUPP; 791813febdbSJosef Bacik } 792813febdbSJosef Bacik 793*ec794a75SOmar Sandoval if (btrfs_root_refs(&root->root_item) == 0) 794*ec794a75SOmar Sandoval return -ENOENT; 795*ec794a75SOmar Sandoval 79692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 797f46b5a66SChristoph Hellwig return -EINVAL; 798f46b5a66SChristoph Hellwig 799eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 800eede2bf3SOmar Sandoval btrfs_warn(fs_info, 801eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 802eede2bf3SOmar Sandoval return -ETXTBSY; 803eede2bf3SOmar Sandoval } 804eede2bf3SOmar Sandoval 80523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 806a1ee7362SDavid Sterba if (!pending_snapshot) 807a1ee7362SDavid Sterba return -ENOMEM; 808a1ee7362SDavid Sterba 8092dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8102dfb1e43SQu Wenruo if (ret < 0) 8112dfb1e43SQu Wenruo goto free_pending; 812b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 81323269bf5SDavid Sterba GFP_KERNEL); 8148546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8158546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 816b0c0ea63SDavid Sterba ret = -ENOMEM; 817b0c0ea63SDavid Sterba goto free_pending; 818b0c0ea63SDavid Sterba } 819b0c0ea63SDavid Sterba 82066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 82166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 822d5c12070SMiao Xie /* 8233538d68dSOmar Sandoval * 1 to add dir item 8243538d68dSOmar Sandoval * 1 to add dir index 8253538d68dSOmar Sandoval * 1 to update parent inode item 826d5c12070SMiao Xie */ 8273538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 828d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8293538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8303538d68dSOmar Sandoval trans_num_items, false); 831d5c12070SMiao Xie if (ret) 832c11fbb6eSRobbie Ko goto free_pending; 833d5c12070SMiao Xie 834a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 835a22285a6SYan, Zheng pending_snapshot->root = root; 836b83cc969SLi Zefan pending_snapshot->readonly = readonly; 837e9662f70SMiao Xie pending_snapshot->dir = dir; 8388696c533SMiao Xie pending_snapshot->inherit = inherit; 839a22285a6SYan, Zheng 840d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 841a22285a6SYan, Zheng if (IS_ERR(trans)) { 842a22285a6SYan, Zheng ret = PTR_ERR(trans); 843a22285a6SYan, Zheng goto fail; 844a22285a6SYan, Zheng } 845a22285a6SYan, Zheng 84628b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8479babda9fSNikolay Borisov 8483a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 849aec8030aSMiao Xie if (ret) 850c37b2b62SJosef Bacik goto fail; 851a22285a6SYan, Zheng 852a22285a6SYan, Zheng ret = pending_snapshot->error; 853f46b5a66SChristoph Hellwig if (ret) 8542e4bfab9SYan, Zheng goto fail; 855f46b5a66SChristoph Hellwig 856d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 857d3797308SChris Mason if (ret) 858d3797308SChris Mason goto fail; 859d3797308SChris Mason 8602b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8612e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8622e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8632e4bfab9SYan, Zheng goto fail; 8642e4bfab9SYan, Zheng } 8655662344bSTsutomu Itoh 8662e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8672e4bfab9SYan, Zheng ret = 0; 8682dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8692e4bfab9SYan, Zheng fail: 8702dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8712dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8722dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 87300246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 874e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 875b0c0ea63SDavid Sterba free_pending: 8762dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8772dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 878b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8798546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 880a1ee7362SDavid Sterba kfree(pending_snapshot); 881a1ee7362SDavid Sterba 882f46b5a66SChristoph Hellwig return ret; 883f46b5a66SChristoph Hellwig } 884f46b5a66SChristoph Hellwig 8854260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8864260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8874260f7c7SSage Weil * whether the type of victim is right. 8884260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8894260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8904260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8914260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8924260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8934260f7c7SSage Weil * a. be owner of dir, or 8944260f7c7SSage Weil * b. be owner of victim, or 8954260f7c7SSage Weil * c. have CAP_FOWNER capability 89601327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8974260f7c7SSage Weil * links pointing to it. 8984260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8994260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 9004260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 9014260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9024260f7c7SSage Weil * nfs_async_unlink(). 9034260f7c7SSage Weil */ 9044260f7c7SSage Weil 9054609e1f1SChristian Brauner static int btrfs_may_delete(struct mnt_idmap *idmap, 906c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 9074260f7c7SSage Weil { 9084260f7c7SSage Weil int error; 9094260f7c7SSage Weil 9102b0143b5SDavid Howells if (d_really_is_negative(victim)) 9114260f7c7SSage Weil return -ENOENT; 9124260f7c7SSage Weil 9132b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9144fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9154260f7c7SSage Weil 9164609e1f1SChristian Brauner error = inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC); 9174260f7c7SSage Weil if (error) 9184260f7c7SSage Weil return error; 9194260f7c7SSage Weil if (IS_APPEND(dir)) 9204260f7c7SSage Weil return -EPERM; 9219452e93eSChristian Brauner if (check_sticky(idmap, dir, d_inode(victim)) || 922ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 923ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9244260f7c7SSage Weil return -EPERM; 9254260f7c7SSage Weil if (isdir) { 926e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9274260f7c7SSage Weil return -ENOTDIR; 9284260f7c7SSage Weil if (IS_ROOT(victim)) 9294260f7c7SSage Weil return -EBUSY; 930e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9314260f7c7SSage Weil return -EISDIR; 9324260f7c7SSage Weil if (IS_DEADDIR(dir)) 9334260f7c7SSage Weil return -ENOENT; 9344260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9354260f7c7SSage Weil return -EBUSY; 9364260f7c7SSage Weil return 0; 9374260f7c7SSage Weil } 9384260f7c7SSage Weil 939cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9404609e1f1SChristian Brauner static inline int btrfs_may_create(struct mnt_idmap *idmap, 9414d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 942cb8e7090SChristoph Hellwig { 9432b0143b5SDavid Howells if (d_really_is_positive(child)) 944cb8e7090SChristoph Hellwig return -EEXIST; 945cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 946cb8e7090SChristoph Hellwig return -ENOENT; 9474609e1f1SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, idmap)) 9485474bf40SChristian Brauner return -EOVERFLOW; 9494609e1f1SChristian Brauner return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC); 950cb8e7090SChristoph Hellwig } 951cb8e7090SChristoph Hellwig 952cb8e7090SChristoph Hellwig /* 953cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 954cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 955cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 956cb8e7090SChristoph Hellwig */ 95792872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9584609e1f1SChristian Brauner struct mnt_idmap *idmap, 95952f75f4fSDavid Sterba const char *name, int namelen, 96072fd032eSSage Weil struct btrfs_root *snap_src, 9619babda9fSNikolay Borisov bool readonly, 9628696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 963cb8e7090SChristoph Hellwig { 9642b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9650b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 966cb8e7090SChristoph Hellwig struct dentry *dentry; 9676db75318SSweet Tea Dorminy struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); 968cb8e7090SChristoph Hellwig int error; 969cb8e7090SChristoph Hellwig 97000235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 97100235411SAl Viro if (error == -EINTR) 97200235411SAl Viro return error; 973cb8e7090SChristoph Hellwig 9744609e1f1SChristian Brauner dentry = lookup_one(idmap, name, parent->dentry, namelen); 975cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 976cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 977cb8e7090SChristoph Hellwig goto out_unlock; 978cb8e7090SChristoph Hellwig 9794609e1f1SChristian Brauner error = btrfs_may_create(idmap, dir, dentry); 980cb8e7090SChristoph Hellwig if (error) 981a874a63eSLiu Bo goto out_dput; 982cb8e7090SChristoph Hellwig 9839c52057cSChris Mason /* 9849c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9859c52057cSChris Mason * check for them now when we can safely fail 9869c52057cSChris Mason */ 9879c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 988e43eec81SSweet Tea Dorminy dir->i_ino, &name_str); 9899c52057cSChris Mason if (error) 9909c52057cSChris Mason goto out_dput; 9919c52057cSChris Mason 9920b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 99376dda93cSYan, Zheng 99476dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 99576dda93cSYan, Zheng goto out_up_read; 99676dda93cSYan, Zheng 9979babda9fSNikolay Borisov if (snap_src) 9989babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9999babda9fSNikolay Borisov else 1000f2d40141SChristian Brauner error = create_subvol(idmap, dir, dentry, inherit); 10019babda9fSNikolay Borisov 100276dda93cSYan, Zheng if (!error) 100376dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 100476dda93cSYan, Zheng out_up_read: 10050b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1006cb8e7090SChristoph Hellwig out_dput: 1007cb8e7090SChristoph Hellwig dput(dentry); 1008cb8e7090SChristoph Hellwig out_unlock: 1009e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(dir), 0); 1010cb8e7090SChristoph Hellwig return error; 1011cb8e7090SChristoph Hellwig } 1012cb8e7090SChristoph Hellwig 1013c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10144609e1f1SChristian Brauner struct mnt_idmap *idmap, 1015c11fbb6eSRobbie Ko const char *name, int namelen, 1016c11fbb6eSRobbie Ko struct btrfs_root *root, 1017c11fbb6eSRobbie Ko bool readonly, 1018c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1019c11fbb6eSRobbie Ko { 1020c11fbb6eSRobbie Ko int ret; 1021c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1022c11fbb6eSRobbie Ko 1023c11fbb6eSRobbie Ko /* 1024c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1025c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1026c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1027c11fbb6eSRobbie Ko */ 1028c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1029c11fbb6eSRobbie Ko 1030f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1031c11fbb6eSRobbie Ko if (ret) 1032c11fbb6eSRobbie Ko goto out; 1033c11fbb6eSRobbie Ko 1034c11fbb6eSRobbie Ko /* 1035c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1036c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1037c11fbb6eSRobbie Ko * creation. 1038c11fbb6eSRobbie Ko */ 1039c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1040c11fbb6eSRobbie Ko snapshot_force_cow = true; 1041c11fbb6eSRobbie Ko 1042c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1043c11fbb6eSRobbie Ko 10444609e1f1SChristian Brauner ret = btrfs_mksubvol(parent, idmap, name, namelen, 1045c11fbb6eSRobbie Ko root, readonly, inherit); 1046c11fbb6eSRobbie Ko out: 1047c11fbb6eSRobbie Ko if (snapshot_force_cow) 1048c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1049c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1050c11fbb6eSRobbie Ko return ret; 1051c11fbb6eSRobbie Ko } 1052c11fbb6eSRobbie Ko 1053d5633b0dSQu Wenruo /* 105417aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 105517aaa434SDavid Sterba * 105617aaa434SDavid Sterba * Return: 105717aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 105817aaa434SDavid Sterba * >0 - normal mode, something else is running, 105917aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 106017aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 106117aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 106217aaa434SDavid Sterba */ 106317aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 106417aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 106517aaa434SDavid Sterba { 106617aaa434SDavid Sterba if (!cancel) { 106717aaa434SDavid Sterba /* Start normal op */ 106817aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 106917aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 107017aaa434SDavid Sterba /* Exclusive operation is now claimed */ 107117aaa434SDavid Sterba return 0; 107217aaa434SDavid Sterba } 107317aaa434SDavid Sterba 107417aaa434SDavid Sterba /* Cancel running op */ 107517aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 107617aaa434SDavid Sterba /* 107717aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 107817aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 107917aaa434SDavid Sterba * or it has finished and no waiting will happen. 108017aaa434SDavid Sterba */ 108117aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 108217aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 108317aaa434SDavid Sterba 108417aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 108517aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 108617aaa434SDavid Sterba TASK_INTERRUPTIBLE); 108717aaa434SDavid Sterba 108817aaa434SDavid Sterba return -ECANCELED; 108917aaa434SDavid Sterba } 109017aaa434SDavid Sterba 109117aaa434SDavid Sterba /* Something else is running or none */ 109217aaa434SDavid Sterba return -ENOTCONN; 109317aaa434SDavid Sterba } 109417aaa434SDavid Sterba 1095198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 109676dda93cSYan, Zheng void __user *arg) 1097f46b5a66SChristoph Hellwig { 1098562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 10990b246afaSJeff Mahoney struct inode *inode = file_inode(file); 11000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1101f46b5a66SChristoph Hellwig u64 new_size; 1102f46b5a66SChristoph Hellwig u64 old_size; 1103f46b5a66SChristoph Hellwig u64 devid = 1; 11040b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1105f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1106f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1107f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1108f46b5a66SChristoph Hellwig char *sizestr; 11099a40f122SGui Hecheng char *retptr; 1110f46b5a66SChristoph Hellwig char *devstr = NULL; 1111f46b5a66SChristoph Hellwig int ret = 0; 1112f46b5a66SChristoph Hellwig int mod = 0; 1113bb059a37SDavid Sterba bool cancel; 1114f46b5a66SChristoph Hellwig 1115e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1116e441d54dSChris Mason return -EPERM; 1117e441d54dSChris Mason 1118198605a8SMiao Xie ret = mnt_want_write_file(file); 1119198605a8SMiao Xie if (ret) 1120198605a8SMiao Xie return ret; 1121198605a8SMiao Xie 1122bb059a37SDavid Sterba /* 1123bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1124bb059a37SDavid Sterba * distinguish regular resize and cancel 1125bb059a37SDavid Sterba */ 1126dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1127c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1128c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1129bb059a37SDavid Sterba goto out_drop; 1130c9e9f97bSIlya Dryomov } 11315516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1132f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1133bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1134bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1135bb059a37SDavid Sterba if (ret) 1136bb059a37SDavid Sterba goto out_free; 1137bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1138bb059a37SDavid Sterba 1139f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1140f46b5a66SChristoph Hellwig if (devstr) { 1141f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1142f46b5a66SChristoph Hellwig *devstr = '\0'; 1143f46b5a66SChristoph Hellwig devstr = vol_args->name; 114458dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 114558dfae63SZhangZhen if (ret) 1146bb059a37SDavid Sterba goto out_finish; 1147dfd79829SMiao Xie if (!devid) { 1148dfd79829SMiao Xie ret = -EINVAL; 1149bb059a37SDavid Sterba goto out_finish; 1150dfd79829SMiao Xie } 11510b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1152f46b5a66SChristoph Hellwig } 1153dba60f3fSMiao Xie 1154562d7b15SJosef Bacik args.devid = devid; 1155562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 1156f46b5a66SChristoph Hellwig if (!device) { 11570b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1158c1c9ff7cSGeert Uytterhoeven devid); 1159dfd79829SMiao Xie ret = -ENODEV; 1160bb059a37SDavid Sterba goto out_finish; 1161f46b5a66SChristoph Hellwig } 1162dba60f3fSMiao Xie 1163ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 11640b246afaSJeff Mahoney btrfs_info(fs_info, 1165efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1166c1c9ff7cSGeert Uytterhoeven devid); 1167dfd79829SMiao Xie ret = -EPERM; 1168bb059a37SDavid Sterba goto out_finish; 11694e42ae1bSLiu Bo } 11704e42ae1bSLiu Bo 1171f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1172cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 1173f46b5a66SChristoph Hellwig else { 1174f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1175f46b5a66SChristoph Hellwig mod = -1; 1176f46b5a66SChristoph Hellwig sizestr++; 1177f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1178f46b5a66SChristoph Hellwig mod = 1; 1179f46b5a66SChristoph Hellwig sizestr++; 1180f46b5a66SChristoph Hellwig } 11819a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 11829a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1183f46b5a66SChristoph Hellwig ret = -EINVAL; 1184bb059a37SDavid Sterba goto out_finish; 1185f46b5a66SChristoph Hellwig } 1186f46b5a66SChristoph Hellwig } 1187f46b5a66SChristoph Hellwig 1188401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1189dfd79829SMiao Xie ret = -EPERM; 1190bb059a37SDavid Sterba goto out_finish; 119163a212abSStefan Behrens } 119263a212abSStefan Behrens 11937cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1194f46b5a66SChristoph Hellwig 1195f46b5a66SChristoph Hellwig if (mod < 0) { 1196f46b5a66SChristoph Hellwig if (new_size > old_size) { 1197f46b5a66SChristoph Hellwig ret = -EINVAL; 1198bb059a37SDavid Sterba goto out_finish; 1199f46b5a66SChristoph Hellwig } 1200f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1201f46b5a66SChristoph Hellwig } else if (mod > 0) { 1202eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1203902c68a4SGui Hecheng ret = -ERANGE; 1204bb059a37SDavid Sterba goto out_finish; 1205eb8052e0SWenliang Fan } 1206f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1207f46b5a66SChristoph Hellwig } 1208f46b5a66SChristoph Hellwig 1209ee22184bSByongho Lee if (new_size < SZ_256M) { 1210f46b5a66SChristoph Hellwig ret = -EINVAL; 1211bb059a37SDavid Sterba goto out_finish; 1212f46b5a66SChristoph Hellwig } 1213cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 1214f46b5a66SChristoph Hellwig ret = -EFBIG; 1215bb059a37SDavid Sterba goto out_finish; 1216f46b5a66SChristoph Hellwig } 1217f46b5a66SChristoph Hellwig 121847f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1219f46b5a66SChristoph Hellwig 1220f46b5a66SChristoph Hellwig if (new_size > old_size) { 1221a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 122298d5dc13STsutomu Itoh if (IS_ERR(trans)) { 122398d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1224bb059a37SDavid Sterba goto out_finish; 122598d5dc13STsutomu Itoh } 1226f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 12273a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1228ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1229f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 12300253f40eSjeff.liu } /* equal, nothing need to do */ 1231f46b5a66SChristoph Hellwig 1232faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1233faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1234faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1235cb3e217bSQu Wenruo btrfs_dev_name(device), device->devid, 1236faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1237bb059a37SDavid Sterba out_finish: 1238bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1239c9e9f97bSIlya Dryomov out_free: 1240f46b5a66SChristoph Hellwig kfree(vol_args); 1241bb059a37SDavid Sterba out_drop: 124218f39c41SIlya Dryomov mnt_drop_write_file(file); 1243f46b5a66SChristoph Hellwig return ret; 1244f46b5a66SChristoph Hellwig } 1245f46b5a66SChristoph Hellwig 12465d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 12474609e1f1SChristian Brauner struct mnt_idmap *idmap, 124852f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 12495d54c67eSNikolay Borisov bool readonly, 12508696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1251f46b5a66SChristoph Hellwig { 1252f46b5a66SChristoph Hellwig int namelen; 12533de4586cSChris Mason int ret = 0; 1254f46b5a66SChristoph Hellwig 1255325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1256325c50e3SJeff Mahoney return -ENOTDIR; 1257325c50e3SJeff Mahoney 1258a874a63eSLiu Bo ret = mnt_want_write_file(file); 1259a874a63eSLiu Bo if (ret) 1260a874a63eSLiu Bo goto out; 1261a874a63eSLiu Bo 126272fd032eSSage Weil namelen = strlen(name); 126372fd032eSSage Weil if (strchr(name, '/')) { 1264f46b5a66SChristoph Hellwig ret = -EINVAL; 1265a874a63eSLiu Bo goto out_drop_write; 1266f46b5a66SChristoph Hellwig } 1267f46b5a66SChristoph Hellwig 126816780cabSChris Mason if (name[0] == '.' && 126916780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 127016780cabSChris Mason ret = -EEXIST; 1271a874a63eSLiu Bo goto out_drop_write; 127216780cabSChris Mason } 127316780cabSChris Mason 12743de4586cSChris Mason if (subvol) { 12754609e1f1SChristian Brauner ret = btrfs_mksubvol(&file->f_path, idmap, name, 12764d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1277cb8e7090SChristoph Hellwig } else { 12782903ff01SAl Viro struct fd src = fdget(fd); 12793de4586cSChris Mason struct inode *src_inode; 12802903ff01SAl Viro if (!src.file) { 12813de4586cSChris Mason ret = -EINVAL; 1282a874a63eSLiu Bo goto out_drop_write; 12833de4586cSChris Mason } 12843de4586cSChris Mason 1285496ad9aaSAl Viro src_inode = file_inode(src.file); 1286496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1287c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1288efe120a0SFrank Holton "Snapshot src from another FS"); 128923ad5b17SKusanagi Kouichi ret = -EXDEV; 129001beba79SChristian Brauner } else if (!inode_owner_or_capable(idmap, src_inode)) { 1291d0242061SDavid Sterba /* 1292d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1293d0242061SDavid Sterba * are limited to own subvolumes only 1294d0242061SDavid Sterba */ 1295d0242061SDavid Sterba ret = -EPERM; 129665446174SJosef Bacik } else if (btrfs_ino(BTRFS_I(src_inode)) != BTRFS_FIRST_FREE_OBJECTID) { 129765446174SJosef Bacik /* 129865446174SJosef Bacik * Snapshots must be made with the src_inode referring 129965446174SJosef Bacik * to the subvolume inode, otherwise the permission 130065446174SJosef Bacik * checking above is useless because we may have 130165446174SJosef Bacik * permission on a lower directory but not the subvol 130265446174SJosef Bacik * itself. 130365446174SJosef Bacik */ 130465446174SJosef Bacik ret = -EINVAL; 1305ecd18815SAl Viro } else { 13064609e1f1SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, idmap, 13074d4340c9SChristian Brauner name, namelen, 130872fd032eSSage Weil BTRFS_I(src_inode)->root, 13095d54c67eSNikolay Borisov readonly, inherit); 1310ecd18815SAl Viro } 13112903ff01SAl Viro fdput(src); 1312cb8e7090SChristoph Hellwig } 1313a874a63eSLiu Bo out_drop_write: 1314a874a63eSLiu Bo mnt_drop_write_file(file); 1315f46b5a66SChristoph Hellwig out: 131672fd032eSSage Weil return ret; 131772fd032eSSage Weil } 131872fd032eSSage Weil 131972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1320fa0d2b9bSLi Zefan void __user *arg, int subvol) 132172fd032eSSage Weil { 1322fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 132372fd032eSSage Weil int ret; 132472fd032eSSage Weil 1325325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1326325c50e3SJeff Mahoney return -ENOTDIR; 1327325c50e3SJeff Mahoney 1328fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1329fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1330fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1331fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1332fa0d2b9bSLi Zefan 13334609e1f1SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), 13344d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13354d4340c9SChristian Brauner false, NULL); 1336fa0d2b9bSLi Zefan 1337fa0d2b9bSLi Zefan kfree(vol_args); 1338fa0d2b9bSLi Zefan return ret; 1339fa0d2b9bSLi Zefan } 1340fa0d2b9bSLi Zefan 1341fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1342fa0d2b9bSLi Zefan void __user *arg, int subvol) 1343fa0d2b9bSLi Zefan { 1344fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1345fa0d2b9bSLi Zefan int ret; 1346b83cc969SLi Zefan bool readonly = false; 13476f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 134872fd032eSSage Weil 1349325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1350325c50e3SJeff Mahoney return -ENOTDIR; 1351325c50e3SJeff Mahoney 1352fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1353fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1354fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1355fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1356fdfb1e4fSLi Zefan 1357673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1358b83cc969SLi Zefan ret = -EOPNOTSUPP; 1359c47ca32dSDan Carpenter goto free_args; 1360fdfb1e4fSLi Zefan } 1361fdfb1e4fSLi Zefan 1362b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1363b83cc969SLi Zefan readonly = true; 13646f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 13655011c5a6SDan Carpenter u64 nums; 13665011c5a6SDan Carpenter 13675011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 13685011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 13696f72c7e2SArne Jansen ret = -EINVAL; 1370c47ca32dSDan Carpenter goto free_args; 13716f72c7e2SArne Jansen } 13726f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 13736f72c7e2SArne Jansen if (IS_ERR(inherit)) { 13746f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1375c47ca32dSDan Carpenter goto free_args; 13766f72c7e2SArne Jansen } 13775011c5a6SDan Carpenter 13785011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 13795011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 13805011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 13815011c5a6SDan Carpenter ret = -EINVAL; 13825011c5a6SDan Carpenter goto free_inherit; 13835011c5a6SDan Carpenter } 13845011c5a6SDan Carpenter 13855011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 13865011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 13875011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 13885011c5a6SDan Carpenter ret = -EINVAL; 13895011c5a6SDan Carpenter goto free_inherit; 13905011c5a6SDan Carpenter } 13916f72c7e2SArne Jansen } 139275eaa0e2SSage Weil 13934609e1f1SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), 13944d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13954d4340c9SChristian Brauner readonly, inherit); 1396c47ca32dSDan Carpenter if (ret) 1397c47ca32dSDan Carpenter goto free_inherit; 1398c47ca32dSDan Carpenter free_inherit: 13996f72c7e2SArne Jansen kfree(inherit); 1400c47ca32dSDan Carpenter free_args: 1401c47ca32dSDan Carpenter kfree(vol_args); 1402f46b5a66SChristoph Hellwig return ret; 1403f46b5a66SChristoph Hellwig } 1404f46b5a66SChristoph Hellwig 14059ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 14060caa102dSLi Zefan void __user *arg) 14070caa102dSLi Zefan { 14080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14090caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14100caa102dSLi Zefan int ret = 0; 14110caa102dSLi Zefan u64 flags = 0; 14120caa102dSLi Zefan 14134a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 14140caa102dSLi Zefan return -EINVAL; 14150caa102dSLi Zefan 14160b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 14170caa102dSLi Zefan if (btrfs_root_readonly(root)) 14180caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 14190b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 14200caa102dSLi Zefan 14210caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 14220caa102dSLi Zefan ret = -EFAULT; 14230caa102dSLi Zefan 14240caa102dSLi Zefan return ret; 14250caa102dSLi Zefan } 14260caa102dSLi Zefan 14270caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 14280caa102dSLi Zefan void __user *arg) 14290caa102dSLi Zefan { 1430496ad9aaSAl Viro struct inode *inode = file_inode(file); 14310b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14320caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14330caa102dSLi Zefan struct btrfs_trans_handle *trans; 14340caa102dSLi Zefan u64 root_flags; 14350caa102dSLi Zefan u64 flags; 14360caa102dSLi Zefan int ret = 0; 14370caa102dSLi Zefan 143801beba79SChristian Brauner if (!inode_owner_or_capable(file_mnt_idmap(file), inode)) 1439bd60ea0fSDavid Sterba return -EPERM; 1440bd60ea0fSDavid Sterba 1441b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1442b9ca0664SLiu Bo if (ret) 1443b9ca0664SLiu Bo goto out; 14440caa102dSLi Zefan 14454a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1446b9ca0664SLiu Bo ret = -EINVAL; 1447b9ca0664SLiu Bo goto out_drop_write; 1448b9ca0664SLiu Bo } 14490caa102dSLi Zefan 1450b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1451b9ca0664SLiu Bo ret = -EFAULT; 1452b9ca0664SLiu Bo goto out_drop_write; 1453b9ca0664SLiu Bo } 14540caa102dSLi Zefan 1455b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1456b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1457b9ca0664SLiu Bo goto out_drop_write; 1458b9ca0664SLiu Bo } 14590caa102dSLi Zefan 14600b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 14610caa102dSLi Zefan 14620caa102dSLi Zefan /* nothing to do */ 14630caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1464b9ca0664SLiu Bo goto out_drop_sem; 14650caa102dSLi Zefan 14660caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 14672c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 14680caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14690caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 14702c686537SDavid Sterba } else { 14712c686537SDavid Sterba /* 14722c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 14732c686537SDavid Sterba * send 14742c686537SDavid Sterba */ 14752c686537SDavid Sterba spin_lock(&root->root_item_lock); 14762c686537SDavid Sterba if (root->send_in_progress == 0) { 14770caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14780caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 14792c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14802c686537SDavid Sterba } else { 14812c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14820b246afaSJeff Mahoney btrfs_warn(fs_info, 14832c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 14842c686537SDavid Sterba root->root_key.objectid); 14852c686537SDavid Sterba ret = -EPERM; 14862c686537SDavid Sterba goto out_drop_sem; 14872c686537SDavid Sterba } 14882c686537SDavid Sterba } 14890caa102dSLi Zefan 14900caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 14910caa102dSLi Zefan if (IS_ERR(trans)) { 14920caa102dSLi Zefan ret = PTR_ERR(trans); 14930caa102dSLi Zefan goto out_reset; 14940caa102dSLi Zefan } 14950caa102dSLi Zefan 14960b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 14970caa102dSLi Zefan &root->root_key, &root->root_item); 14989417ebc8SNikolay Borisov if (ret < 0) { 14999417ebc8SNikolay Borisov btrfs_end_transaction(trans); 15009417ebc8SNikolay Borisov goto out_reset; 15019417ebc8SNikolay Borisov } 15020caa102dSLi Zefan 15039417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 15049417ebc8SNikolay Borisov 15050caa102dSLi Zefan out_reset: 15060caa102dSLi Zefan if (ret) 15070caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1508b9ca0664SLiu Bo out_drop_sem: 15090b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1510b9ca0664SLiu Bo out_drop_write: 1511b9ca0664SLiu Bo mnt_drop_write_file(file); 1512b9ca0664SLiu Bo out: 15130caa102dSLi Zefan return ret; 15140caa102dSLi Zefan } 15150caa102dSLi Zefan 1516ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1517ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1518ac8e9819SChris Mason { 1519abc6e134SChris Mason struct btrfs_key test; 1520abc6e134SChris Mason int ret; 1521abc6e134SChris Mason 1522abc6e134SChris Mason test.objectid = sk->min_objectid; 1523abc6e134SChris Mason test.type = sk->min_type; 1524abc6e134SChris Mason test.offset = sk->min_offset; 1525abc6e134SChris Mason 1526abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1527abc6e134SChris Mason if (ret < 0) 1528ac8e9819SChris Mason return 0; 1529abc6e134SChris Mason 1530abc6e134SChris Mason test.objectid = sk->max_objectid; 1531abc6e134SChris Mason test.type = sk->max_type; 1532abc6e134SChris Mason test.offset = sk->max_offset; 1533abc6e134SChris Mason 1534abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1535abc6e134SChris Mason if (ret > 0) 1536ac8e9819SChris Mason return 0; 1537ac8e9819SChris Mason return 1; 1538ac8e9819SChris Mason } 1539ac8e9819SChris Mason 1540df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1541ac8e9819SChris Mason struct btrfs_key *key, 1542ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 15439ac639deSFilipe Manana u64 *buf_size, 1544ba346b35SGerhard Heift char __user *ubuf, 1545ac8e9819SChris Mason unsigned long *sk_offset, 1546ac8e9819SChris Mason int *num_found) 1547ac8e9819SChris Mason { 1548ac8e9819SChris Mason u64 found_transid; 1549ac8e9819SChris Mason struct extent_buffer *leaf; 1550ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1551dd81d459SNaohiro Aota struct btrfs_key test; 1552ac8e9819SChris Mason unsigned long item_off; 1553ac8e9819SChris Mason unsigned long item_len; 1554ac8e9819SChris Mason int nritems; 1555ac8e9819SChris Mason int i; 1556ac8e9819SChris Mason int slot; 1557ac8e9819SChris Mason int ret = 0; 1558ac8e9819SChris Mason 1559ac8e9819SChris Mason leaf = path->nodes[0]; 1560ac8e9819SChris Mason slot = path->slots[0]; 1561ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1562ac8e9819SChris Mason 1563ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1564ac8e9819SChris Mason i = nritems; 1565ac8e9819SChris Mason goto advance_key; 1566ac8e9819SChris Mason } 1567ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1568ac8e9819SChris Mason 1569ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1570ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 15713212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 1572ac8e9819SChris Mason 157303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 157403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 157503b71c6cSGabriel de Perthuis continue; 157603b71c6cSGabriel de Perthuis 15779b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 15788f5f6178SGerhard Heift if (*num_found) { 1579ac8e9819SChris Mason ret = 1; 15808f5f6178SGerhard Heift goto out; 15818f5f6178SGerhard Heift } 15828f5f6178SGerhard Heift 15838f5f6178SGerhard Heift /* 15848f5f6178SGerhard Heift * return one empty item back for v1, which does not 15858f5f6178SGerhard Heift * handle -EOVERFLOW 15868f5f6178SGerhard Heift */ 15878f5f6178SGerhard Heift 15889b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1589ac8e9819SChris Mason item_len = 0; 15908f5f6178SGerhard Heift ret = -EOVERFLOW; 15918f5f6178SGerhard Heift } 1592ac8e9819SChris Mason 15939b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1594ac8e9819SChris Mason ret = 1; 159525c9bc2eSGerhard Heift goto out; 1596ac8e9819SChris Mason } 1597ac8e9819SChris Mason 1598ac8e9819SChris Mason sh.objectid = key->objectid; 1599ac8e9819SChris Mason sh.offset = key->offset; 1600ac8e9819SChris Mason sh.type = key->type; 1601ac8e9819SChris Mason sh.len = item_len; 1602ac8e9819SChris Mason sh.transid = found_transid; 1603ac8e9819SChris Mason 1604a48b73ecSJosef Bacik /* 1605a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 1606a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 1607a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 1608a48b73ecSJosef Bacik * properly this next time through 1609a48b73ecSJosef Bacik */ 1610a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 1611a48b73ecSJosef Bacik ret = 0; 1612ba346b35SGerhard Heift goto out; 1613ba346b35SGerhard Heift } 1614ba346b35SGerhard Heift 1615ac8e9819SChris Mason *sk_offset += sizeof(sh); 1616ac8e9819SChris Mason 1617ac8e9819SChris Mason if (item_len) { 1618ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1619a48b73ecSJosef Bacik /* 1620a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 1621a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 1622a48b73ecSJosef Bacik */ 1623a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 1624ba346b35SGerhard Heift item_off, item_len)) { 1625a48b73ecSJosef Bacik ret = 0; 1626a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 1627ba346b35SGerhard Heift goto out; 1628ba346b35SGerhard Heift } 1629ba346b35SGerhard Heift 1630ac8e9819SChris Mason *sk_offset += item_len; 1631ac8e9819SChris Mason } 1632e2156867SHugo Mills (*num_found)++; 1633ac8e9819SChris Mason 16348f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 16358f5f6178SGerhard Heift goto out; 16368f5f6178SGerhard Heift 163725c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 163825c9bc2eSGerhard Heift ret = 1; 163925c9bc2eSGerhard Heift goto out; 164025c9bc2eSGerhard Heift } 1641ac8e9819SChris Mason } 1642ac8e9819SChris Mason advance_key: 1643ac8e9819SChris Mason ret = 0; 1644dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 1645dd81d459SNaohiro Aota test.type = sk->max_type; 1646dd81d459SNaohiro Aota test.offset = sk->max_offset; 1647dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 1648dd81d459SNaohiro Aota ret = 1; 1649dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 1650abc6e134SChris Mason key->offset++; 1651dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 1652abc6e134SChris Mason key->offset = 0; 1653abc6e134SChris Mason key->type++; 1654dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 1655abc6e134SChris Mason key->offset = 0; 1656abc6e134SChris Mason key->type = 0; 1657abc6e134SChris Mason key->objectid++; 1658abc6e134SChris Mason } else 1659abc6e134SChris Mason ret = 1; 166025c9bc2eSGerhard Heift out: 1661ba346b35SGerhard Heift /* 1662ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 1663ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 1664ba346b35SGerhard Heift * * all items were found 1665ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 1666ba346b35SGerhard Heift * leaf 1667ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 1668ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 1669ba346b35SGerhard Heift */ 1670ac8e9819SChris Mason return ret; 1671ac8e9819SChris Mason } 1672ac8e9819SChris Mason 1673ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 167412544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 16759ac639deSFilipe Manana u64 *buf_size, 1676ba346b35SGerhard Heift char __user *ubuf) 1677ac8e9819SChris Mason { 16780b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 1679ac8e9819SChris Mason struct btrfs_root *root; 1680ac8e9819SChris Mason struct btrfs_key key; 1681ac8e9819SChris Mason struct btrfs_path *path; 1682ac8e9819SChris Mason int ret; 1683ac8e9819SChris Mason int num_found = 0; 1684ac8e9819SChris Mason unsigned long sk_offset = 0; 1685ac8e9819SChris Mason 16869b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 16879b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 168812544442SGerhard Heift return -EOVERFLOW; 16899b6e817dSGerhard Heift } 169012544442SGerhard Heift 1691ac8e9819SChris Mason path = btrfs_alloc_path(); 1692ac8e9819SChris Mason if (!path) 1693ac8e9819SChris Mason return -ENOMEM; 1694ac8e9819SChris Mason 1695ac8e9819SChris Mason if (sk->tree_id == 0) { 1696ac8e9819SChris Mason /* search the root of the inode that was passed */ 169700246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 1698ac8e9819SChris Mason } else { 169956e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 1700ac8e9819SChris Mason if (IS_ERR(root)) { 1701ac8e9819SChris Mason btrfs_free_path(path); 1702ad1e3d56SMisono Tomohiro return PTR_ERR(root); 1703ac8e9819SChris Mason } 1704ac8e9819SChris Mason } 1705ac8e9819SChris Mason 1706ac8e9819SChris Mason key.objectid = sk->min_objectid; 1707ac8e9819SChris Mason key.type = sk->min_type; 1708ac8e9819SChris Mason key.offset = sk->min_offset; 1709ac8e9819SChris Mason 1710ac8e9819SChris Mason while (1) { 1711bb523b40SAndreas Gruenbacher ret = -EFAULT; 171218788e34SCatalin Marinas /* 171318788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 171418788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 171518788e34SCatalin Marinas */ 171618788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 171718788e34SCatalin Marinas *buf_size - sk_offset)) 1718a48b73ecSJosef Bacik break; 1719a48b73ecSJosef Bacik 17206174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1721ac8e9819SChris Mason if (ret != 0) { 1722ac8e9819SChris Mason if (ret > 0) 1723ac8e9819SChris Mason ret = 0; 1724ac8e9819SChris Mason goto err; 1725ac8e9819SChris Mason } 1726df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 1727ac8e9819SChris Mason &sk_offset, &num_found); 1728b3b4aa74SDavid Sterba btrfs_release_path(path); 172925c9bc2eSGerhard Heift if (ret) 1730ac8e9819SChris Mason break; 1731ac8e9819SChris Mason 1732ac8e9819SChris Mason } 17338f5f6178SGerhard Heift if (ret > 0) 1734ac8e9819SChris Mason ret = 0; 1735ac8e9819SChris Mason err: 1736ac8e9819SChris Mason sk->nr_items = num_found; 173700246528SJosef Bacik btrfs_put_root(root); 1738ac8e9819SChris Mason btrfs_free_path(path); 1739ac8e9819SChris Mason return ret; 1740ac8e9819SChris Mason } 1741ac8e9819SChris Mason 17429ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 1743ac8e9819SChris Mason void __user *argp) 1744ac8e9819SChris Mason { 17450d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 1746ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 1747ac8e9819SChris Mason int ret; 17489ac639deSFilipe Manana u64 buf_size; 1749ac8e9819SChris Mason 1750ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1751ac8e9819SChris Mason return -EPERM; 1752ac8e9819SChris Mason 1753ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 1754ba346b35SGerhard Heift return -EFAULT; 1755ba346b35SGerhard Heift 1756ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 1757ac8e9819SChris Mason 1758ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 17598f5f6178SGerhard Heift 17608f5f6178SGerhard Heift /* 17618f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 17628f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 17638f5f6178SGerhard Heift */ 17648f5f6178SGerhard Heift if (ret == -EOVERFLOW) 17658f5f6178SGerhard Heift ret = 0; 17668f5f6178SGerhard Heift 1767ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 1768ac8e9819SChris Mason ret = -EFAULT; 1769ac8e9819SChris Mason return ret; 1770ac8e9819SChris Mason } 1771ac8e9819SChris Mason 17729ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 1773cc68a8a5SGerhard Heift void __user *argp) 1774cc68a8a5SGerhard Heift { 17750d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 1776cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 1777cc68a8a5SGerhard Heift int ret; 17789ac639deSFilipe Manana u64 buf_size; 17799ac639deSFilipe Manana const u64 buf_limit = SZ_16M; 1780cc68a8a5SGerhard Heift 1781cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 1782cc68a8a5SGerhard Heift return -EPERM; 1783cc68a8a5SGerhard Heift 1784cc68a8a5SGerhard Heift /* copy search header and buffer size */ 1785cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 1786cc68a8a5SGerhard Heift return -EFAULT; 1787cc68a8a5SGerhard Heift 1788cc68a8a5SGerhard Heift buf_size = args.buf_size; 1789cc68a8a5SGerhard Heift 1790cc68a8a5SGerhard Heift /* limit result size to 16MB */ 1791cc68a8a5SGerhard Heift if (buf_size > buf_limit) 1792cc68a8a5SGerhard Heift buf_size = buf_limit; 1793cc68a8a5SGerhard Heift 1794cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 1795718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 1796cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 1797cc68a8a5SGerhard Heift ret = -EFAULT; 1798cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 1799cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 1800cc68a8a5SGerhard Heift ret = -EFAULT; 1801cc68a8a5SGerhard Heift 180276dda93cSYan, Zheng return ret; 180376dda93cSYan, Zheng } 180476dda93cSYan, Zheng 180598d377a0STARUISI Hiroaki /* 1806ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1807ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 180898d377a0STARUISI Hiroaki */ 180998d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 181098d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 181198d377a0STARUISI Hiroaki { 181298d377a0STARUISI Hiroaki struct btrfs_root *root; 181398d377a0STARUISI Hiroaki struct btrfs_key key; 1814ac8e9819SChris Mason char *ptr; 181598d377a0STARUISI Hiroaki int ret = -1; 181698d377a0STARUISI Hiroaki int slot; 181798d377a0STARUISI Hiroaki int len; 181898d377a0STARUISI Hiroaki int total_len = 0; 181998d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 182098d377a0STARUISI Hiroaki struct extent_buffer *l; 182198d377a0STARUISI Hiroaki struct btrfs_path *path; 182298d377a0STARUISI Hiroaki 182398d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 182498d377a0STARUISI Hiroaki name[0]='\0'; 182598d377a0STARUISI Hiroaki return 0; 182698d377a0STARUISI Hiroaki } 182798d377a0STARUISI Hiroaki 182898d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 182998d377a0STARUISI Hiroaki if (!path) 183098d377a0STARUISI Hiroaki return -ENOMEM; 183198d377a0STARUISI Hiroaki 1832c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 183398d377a0STARUISI Hiroaki 183456e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 183598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 1836ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 183788234012SJosef Bacik root = NULL; 183888234012SJosef Bacik goto out; 183988234012SJosef Bacik } 184098d377a0STARUISI Hiroaki 184198d377a0STARUISI Hiroaki key.objectid = dirid; 184298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18438ad6fcabSChris Mason key.offset = (u64)-1; 184498d377a0STARUISI Hiroaki 184598d377a0STARUISI Hiroaki while (1) { 18460ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 184718674c6cSFilipe David Borba Manana if (ret < 0) 184818674c6cSFilipe David Borba Manana goto out; 184918674c6cSFilipe David Borba Manana else if (ret > 0) { 1850ac8e9819SChris Mason ret = -ENOENT; 185198d377a0STARUISI Hiroaki goto out; 1852ac8e9819SChris Mason } 185318674c6cSFilipe David Borba Manana 185418674c6cSFilipe David Borba Manana l = path->nodes[0]; 185518674c6cSFilipe David Borba Manana slot = path->slots[0]; 185698d377a0STARUISI Hiroaki 185798d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 185898d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 185998d377a0STARUISI Hiroaki ptr -= len + 1; 186098d377a0STARUISI Hiroaki total_len += len + 1; 1861a696cf35SFilipe David Borba Manana if (ptr < name) { 1862a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 186398d377a0STARUISI Hiroaki goto out; 1864a696cf35SFilipe David Borba Manana } 186598d377a0STARUISI Hiroaki 186698d377a0STARUISI Hiroaki *(ptr + len) = '/'; 186798d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 186898d377a0STARUISI Hiroaki 186998d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 187098d377a0STARUISI Hiroaki break; 187198d377a0STARUISI Hiroaki 1872b3b4aa74SDavid Sterba btrfs_release_path(path); 187398d377a0STARUISI Hiroaki key.objectid = key.offset; 18748ad6fcabSChris Mason key.offset = (u64)-1; 187598d377a0STARUISI Hiroaki dirid = key.objectid; 187698d377a0STARUISI Hiroaki } 187777906a50SLi Zefan memmove(name, ptr, total_len); 187898d377a0STARUISI Hiroaki name[total_len] = '\0'; 187998d377a0STARUISI Hiroaki ret = 0; 188098d377a0STARUISI Hiroaki out: 188100246528SJosef Bacik btrfs_put_root(root); 188298d377a0STARUISI Hiroaki btrfs_free_path(path); 1883ac8e9819SChris Mason return ret; 1884ac8e9819SChris Mason } 1885ac8e9819SChris Mason 18864609e1f1SChristian Brauner static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap, 18876623d9a0SChristian Brauner struct inode *inode, 188823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 188923d0b79dSTomohiro Misono { 189023d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 189123d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 189223d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 189323d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 189423d0b79dSTomohiro Misono u64 dirid = args->dirid; 189523d0b79dSTomohiro Misono unsigned long item_off; 189623d0b79dSTomohiro Misono unsigned long item_len; 189723d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 189823d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 1899b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 190023d0b79dSTomohiro Misono struct btrfs_path *path; 190123d0b79dSTomohiro Misono struct btrfs_key key, key2; 190223d0b79dSTomohiro Misono struct extent_buffer *leaf; 190323d0b79dSTomohiro Misono struct inode *temp_inode; 190423d0b79dSTomohiro Misono char *ptr; 190523d0b79dSTomohiro Misono int slot; 190623d0b79dSTomohiro Misono int len; 190723d0b79dSTomohiro Misono int total_len = 0; 190823d0b79dSTomohiro Misono int ret; 190923d0b79dSTomohiro Misono 191023d0b79dSTomohiro Misono path = btrfs_alloc_path(); 191123d0b79dSTomohiro Misono if (!path) 191223d0b79dSTomohiro Misono return -ENOMEM; 191323d0b79dSTomohiro Misono 191423d0b79dSTomohiro Misono /* 191523d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 191623d0b79dSTomohiro Misono * construct the path in from the bottom up. 191723d0b79dSTomohiro Misono */ 191823d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 191923d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 192023d0b79dSTomohiro Misono 192156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 192223d0b79dSTomohiro Misono if (IS_ERR(root)) { 192323d0b79dSTomohiro Misono ret = PTR_ERR(root); 192423d0b79dSTomohiro Misono goto out; 192523d0b79dSTomohiro Misono } 192623d0b79dSTomohiro Misono 192723d0b79dSTomohiro Misono key.objectid = dirid; 192823d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 192923d0b79dSTomohiro Misono key.offset = (u64)-1; 193023d0b79dSTomohiro Misono while (1) { 19310ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 19320ff40a91SMarcos Paulo de Souza if (ret < 0) 1933b8a49ae1SJosef Bacik goto out_put; 19340ff40a91SMarcos Paulo de Souza else if (ret > 0) { 193523d0b79dSTomohiro Misono ret = -ENOENT; 1936b8a49ae1SJosef Bacik goto out_put; 193723d0b79dSTomohiro Misono } 193823d0b79dSTomohiro Misono 193923d0b79dSTomohiro Misono leaf = path->nodes[0]; 194023d0b79dSTomohiro Misono slot = path->slots[0]; 194123d0b79dSTomohiro Misono 194223d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 194323d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 194423d0b79dSTomohiro Misono ptr -= len + 1; 194523d0b79dSTomohiro Misono total_len += len + 1; 194623d0b79dSTomohiro Misono if (ptr < args->path) { 194723d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 1948b8a49ae1SJosef Bacik goto out_put; 194923d0b79dSTomohiro Misono } 195023d0b79dSTomohiro Misono 195123d0b79dSTomohiro Misono *(ptr + len) = '/'; 195223d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 195323d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 195423d0b79dSTomohiro Misono 195523d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 195623d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 195723d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 195823d0b79dSTomohiro Misono if (ret < 0) { 1959b8a49ae1SJosef Bacik goto out_put; 196023d0b79dSTomohiro Misono } else if (ret > 0) { 196123d0b79dSTomohiro Misono ret = -ENOENT; 1962b8a49ae1SJosef Bacik goto out_put; 196323d0b79dSTomohiro Misono } 196423d0b79dSTomohiro Misono 196523d0b79dSTomohiro Misono leaf = path->nodes[0]; 196623d0b79dSTomohiro Misono slot = path->slots[0]; 196723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 196823d0b79dSTomohiro Misono if (key2.objectid != dirid) { 196923d0b79dSTomohiro Misono ret = -ENOENT; 1970b8a49ae1SJosef Bacik goto out_put; 197123d0b79dSTomohiro Misono } 197223d0b79dSTomohiro Misono 1973ee34a82eSFilipe Manana /* 1974ee34a82eSFilipe Manana * We don't need the path anymore, so release it and 1975ee34a82eSFilipe Manana * avoid deadlocks and lockdep warnings in case 1976ee34a82eSFilipe Manana * btrfs_iget() needs to lookup the inode from its root 1977ee34a82eSFilipe Manana * btree and lock the same leaf. 1978ee34a82eSFilipe Manana */ 1979ee34a82eSFilipe Manana btrfs_release_path(path); 19800202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 19813ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 19823ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 1983b8a49ae1SJosef Bacik goto out_put; 19843ca57bd6SMisono Tomohiro } 19854609e1f1SChristian Brauner ret = inode_permission(idmap, temp_inode, 198647291baaSChristian Brauner MAY_READ | MAY_EXEC); 198723d0b79dSTomohiro Misono iput(temp_inode); 198823d0b79dSTomohiro Misono if (ret) { 198923d0b79dSTomohiro Misono ret = -EACCES; 1990b8a49ae1SJosef Bacik goto out_put; 199123d0b79dSTomohiro Misono } 199223d0b79dSTomohiro Misono 199323d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 199423d0b79dSTomohiro Misono break; 199523d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 199623d0b79dSTomohiro Misono ret = -EACCES; 1997b8a49ae1SJosef Bacik goto out_put; 199823d0b79dSTomohiro Misono } 199923d0b79dSTomohiro Misono 200023d0b79dSTomohiro Misono key.objectid = key.offset; 200123d0b79dSTomohiro Misono key.offset = (u64)-1; 200223d0b79dSTomohiro Misono dirid = key.objectid; 200323d0b79dSTomohiro Misono } 200423d0b79dSTomohiro Misono 200523d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 200623d0b79dSTomohiro Misono args->path[total_len] = '\0'; 200700246528SJosef Bacik btrfs_put_root(root); 2008b8a49ae1SJosef Bacik root = NULL; 200923d0b79dSTomohiro Misono btrfs_release_path(path); 201023d0b79dSTomohiro Misono } 201123d0b79dSTomohiro Misono 201223d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 201323d0b79dSTomohiro Misono key.objectid = treeid; 201423d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 201523d0b79dSTomohiro Misono key.offset = args->treeid; 2016b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 201723d0b79dSTomohiro Misono if (ret < 0) { 201823d0b79dSTomohiro Misono goto out; 201923d0b79dSTomohiro Misono } else if (ret > 0) { 202023d0b79dSTomohiro Misono ret = -ENOENT; 202123d0b79dSTomohiro Misono goto out; 202223d0b79dSTomohiro Misono } 202323d0b79dSTomohiro Misono 202423d0b79dSTomohiro Misono leaf = path->nodes[0]; 202523d0b79dSTomohiro Misono slot = path->slots[0]; 202623d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 202723d0b79dSTomohiro Misono 202823d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 20293212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 203023d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 203123d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 203223d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 203323d0b79dSTomohiro Misono ret = -EINVAL; 203423d0b79dSTomohiro Misono goto out; 203523d0b79dSTomohiro Misono } 203623d0b79dSTomohiro Misono 203723d0b79dSTomohiro Misono /* Copy subvolume's name */ 203823d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 203923d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 204023d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 204123d0b79dSTomohiro Misono args->name[item_len] = 0; 204223d0b79dSTomohiro Misono 2043b8a49ae1SJosef Bacik out_put: 204400246528SJosef Bacik btrfs_put_root(root); 204523d0b79dSTomohiro Misono out: 204623d0b79dSTomohiro Misono btrfs_free_path(path); 204723d0b79dSTomohiro Misono return ret; 204823d0b79dSTomohiro Misono } 204923d0b79dSTomohiro Misono 2050dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2051ac8e9819SChris Mason void __user *argp) 2052ac8e9819SChris Mason { 2053ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 205401b810b8SDavid Sterba int ret = 0; 2055ac8e9819SChris Mason 20562354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20572354d08fSJulia Lawall if (IS_ERR(args)) 20582354d08fSJulia Lawall return PTR_ERR(args); 2059c2b96929SDan Carpenter 206001b810b8SDavid Sterba /* 206101b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 206201b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 206301b810b8SDavid Sterba */ 20641b53ac4dSChris Mason if (args->treeid == 0) 2065dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 20661b53ac4dSChris Mason 206701b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 206801b810b8SDavid Sterba args->name[0] = 0; 206901b810b8SDavid Sterba goto out; 207001b810b8SDavid Sterba } 207101b810b8SDavid Sterba 207201b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 207301b810b8SDavid Sterba ret = -EPERM; 207401b810b8SDavid Sterba goto out; 207501b810b8SDavid Sterba } 207601b810b8SDavid Sterba 2077dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2078ac8e9819SChris Mason args->treeid, args->objectid, 2079ac8e9819SChris Mason args->name); 2080ac8e9819SChris Mason 208101b810b8SDavid Sterba out: 2082ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2083ac8e9819SChris Mason ret = -EFAULT; 2084ac8e9819SChris Mason 2085ac8e9819SChris Mason kfree(args); 208698d377a0STARUISI Hiroaki return ret; 208798d377a0STARUISI Hiroaki } 208898d377a0STARUISI Hiroaki 208923d0b79dSTomohiro Misono /* 209023d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 209123d0b79dSTomohiro Misono * 209223d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 209323d0b79dSTomohiro Misono * 209423d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 209523d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 209623d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 209723d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 209823d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 209923d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 210023d0b79dSTomohiro Misono */ 210123d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 210223d0b79dSTomohiro Misono { 210323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 210423d0b79dSTomohiro Misono struct inode *inode; 210523d0b79dSTomohiro Misono int ret; 210623d0b79dSTomohiro Misono 210723d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 210823d0b79dSTomohiro Misono if (IS_ERR(args)) 210923d0b79dSTomohiro Misono return PTR_ERR(args); 211023d0b79dSTomohiro Misono 211123d0b79dSTomohiro Misono inode = file_inode(file); 211223d0b79dSTomohiro Misono 211323d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 211423d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 211523d0b79dSTomohiro Misono /* 211623d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 211723d0b79dSTomohiro Misono * called 211823d0b79dSTomohiro Misono */ 211923d0b79dSTomohiro Misono kfree(args); 212023d0b79dSTomohiro Misono return -EACCES; 212123d0b79dSTomohiro Misono } 212223d0b79dSTomohiro Misono 21234609e1f1SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args); 212423d0b79dSTomohiro Misono 212523d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 212623d0b79dSTomohiro Misono ret = -EFAULT; 212723d0b79dSTomohiro Misono 212823d0b79dSTomohiro Misono kfree(args); 212923d0b79dSTomohiro Misono return ret; 213023d0b79dSTomohiro Misono } 213123d0b79dSTomohiro Misono 2132b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 21339ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2134b64ec075STomohiro Misono { 2135b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2136b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2137b64ec075STomohiro Misono struct btrfs_root *root; 2138b64ec075STomohiro Misono struct btrfs_path *path; 2139b64ec075STomohiro Misono struct btrfs_key key; 2140b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2141b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2142b64ec075STomohiro Misono struct extent_buffer *leaf; 2143b64ec075STomohiro Misono unsigned long item_off; 2144b64ec075STomohiro Misono unsigned long item_len; 2145b64ec075STomohiro Misono int slot; 2146b64ec075STomohiro Misono int ret = 0; 2147b64ec075STomohiro Misono 2148b64ec075STomohiro Misono path = btrfs_alloc_path(); 2149b64ec075STomohiro Misono if (!path) 2150b64ec075STomohiro Misono return -ENOMEM; 2151b64ec075STomohiro Misono 2152b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2153b64ec075STomohiro Misono if (!subvol_info) { 2154b64ec075STomohiro Misono btrfs_free_path(path); 2155b64ec075STomohiro Misono return -ENOMEM; 2156b64ec075STomohiro Misono } 2157b64ec075STomohiro Misono 2158b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2159b64ec075STomohiro Misono 2160b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2161b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 216256e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2163b64ec075STomohiro Misono if (IS_ERR(root)) { 2164b64ec075STomohiro Misono ret = PTR_ERR(root); 216504734e84SJosef Bacik goto out_free; 216604734e84SJosef Bacik } 2167b64ec075STomohiro Misono root_item = &root->root_item; 2168b64ec075STomohiro Misono 2169b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2170b64ec075STomohiro Misono 2171b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2172b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2173b64ec075STomohiro Misono 2174b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2175b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2176b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2177b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2178b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2179b64ec075STomohiro Misono 2180b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2181b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2182b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2183b64ec075STomohiro Misono 2184b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2185b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2186b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2187b64ec075STomohiro Misono 2188b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2189b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2190b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2191b64ec075STomohiro Misono 2192b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2193b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2194b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2195b64ec075STomohiro Misono 2196b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2197b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2198b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2199b64ec075STomohiro Misono key.offset = 0; 220004734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2201b64ec075STomohiro Misono if (ret < 0) { 2202b64ec075STomohiro Misono goto out; 2203b64ec075STomohiro Misono } else if (path->slots[0] >= 2204b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 220504734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2206b64ec075STomohiro Misono if (ret < 0) { 2207b64ec075STomohiro Misono goto out; 2208b64ec075STomohiro Misono } else if (ret > 0) { 2209b64ec075STomohiro Misono ret = -EUCLEAN; 2210b64ec075STomohiro Misono goto out; 2211b64ec075STomohiro Misono } 2212b64ec075STomohiro Misono } 2213b64ec075STomohiro Misono 2214b64ec075STomohiro Misono leaf = path->nodes[0]; 2215b64ec075STomohiro Misono slot = path->slots[0]; 2216b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2217b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2218b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2219b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2220b64ec075STomohiro Misono 2221b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2222b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2223b64ec075STomohiro Misono 2224b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2225b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 22263212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 2227b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2228b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2229b64ec075STomohiro Misono item_off, item_len); 2230b64ec075STomohiro Misono } else { 2231b64ec075STomohiro Misono ret = -ENOENT; 2232b64ec075STomohiro Misono goto out; 2233b64ec075STomohiro Misono } 2234b64ec075STomohiro Misono } 2235b64ec075STomohiro Misono 2236013c1c55SAnand Jain btrfs_free_path(path); 2237013c1c55SAnand Jain path = NULL; 2238b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2239b64ec075STomohiro Misono ret = -EFAULT; 2240b64ec075STomohiro Misono 2241b64ec075STomohiro Misono out: 224200246528SJosef Bacik btrfs_put_root(root); 224304734e84SJosef Bacik out_free: 2244b64ec075STomohiro Misono btrfs_free_path(path); 2245b091f7feSWaiman Long kfree(subvol_info); 2246b64ec075STomohiro Misono return ret; 2247b64ec075STomohiro Misono } 2248b64ec075STomohiro Misono 224942e4b520STomohiro Misono /* 225042e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 225142e4b520STomohiro Misono * except the subvolume name. 225242e4b520STomohiro Misono */ 22539ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 2254dc408ccdSSahil Kang void __user *argp) 225542e4b520STomohiro Misono { 225642e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 225742e4b520STomohiro Misono struct btrfs_root_ref *rref; 225842e4b520STomohiro Misono struct btrfs_path *path; 225942e4b520STomohiro Misono struct btrfs_key key; 226042e4b520STomohiro Misono struct extent_buffer *leaf; 226142e4b520STomohiro Misono u64 objectid; 226242e4b520STomohiro Misono int slot; 226342e4b520STomohiro Misono int ret; 226442e4b520STomohiro Misono u8 found; 226542e4b520STomohiro Misono 226642e4b520STomohiro Misono path = btrfs_alloc_path(); 226742e4b520STomohiro Misono if (!path) 226842e4b520STomohiro Misono return -ENOMEM; 226942e4b520STomohiro Misono 227042e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 227142e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 227242e4b520STomohiro Misono btrfs_free_path(path); 227342e4b520STomohiro Misono return PTR_ERR(rootrefs); 227442e4b520STomohiro Misono } 227542e4b520STomohiro Misono 22769ad12305SSahil Kang objectid = root->root_key.objectid; 227742e4b520STomohiro Misono key.objectid = objectid; 227842e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 227942e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 228042e4b520STomohiro Misono found = 0; 228142e4b520STomohiro Misono 22829ad12305SSahil Kang root = root->fs_info->tree_root; 228342e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 228442e4b520STomohiro Misono if (ret < 0) { 228542e4b520STomohiro Misono goto out; 228642e4b520STomohiro Misono } else if (path->slots[0] >= 228742e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 228842e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 228942e4b520STomohiro Misono if (ret < 0) { 229042e4b520STomohiro Misono goto out; 229142e4b520STomohiro Misono } else if (ret > 0) { 229242e4b520STomohiro Misono ret = -EUCLEAN; 229342e4b520STomohiro Misono goto out; 229442e4b520STomohiro Misono } 229542e4b520STomohiro Misono } 229642e4b520STomohiro Misono while (1) { 229742e4b520STomohiro Misono leaf = path->nodes[0]; 229842e4b520STomohiro Misono slot = path->slots[0]; 229942e4b520STomohiro Misono 230042e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 230142e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 230242e4b520STomohiro Misono ret = 0; 230342e4b520STomohiro Misono goto out; 230442e4b520STomohiro Misono } 230542e4b520STomohiro Misono 230642e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 230742e4b520STomohiro Misono ret = -EOVERFLOW; 230842e4b520STomohiro Misono goto out; 230942e4b520STomohiro Misono } 231042e4b520STomohiro Misono 231142e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 231242e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 231342e4b520STomohiro Misono rootrefs->rootref[found].dirid = 231442e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 231542e4b520STomohiro Misono found++; 231642e4b520STomohiro Misono 231742e4b520STomohiro Misono ret = btrfs_next_item(root, path); 231842e4b520STomohiro Misono if (ret < 0) { 231942e4b520STomohiro Misono goto out; 232042e4b520STomohiro Misono } else if (ret > 0) { 232142e4b520STomohiro Misono ret = -EUCLEAN; 232242e4b520STomohiro Misono goto out; 232342e4b520STomohiro Misono } 232442e4b520STomohiro Misono } 232542e4b520STomohiro Misono 232642e4b520STomohiro Misono out: 2327b740d806SJosef Bacik btrfs_free_path(path); 2328b740d806SJosef Bacik 232942e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 233042e4b520STomohiro Misono rootrefs->num_items = found; 233142e4b520STomohiro Misono /* update min_treeid for next search */ 233242e4b520STomohiro Misono if (found) 233342e4b520STomohiro Misono rootrefs->min_treeid = 233442e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 233542e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 233642e4b520STomohiro Misono ret = -EFAULT; 233742e4b520STomohiro Misono } 233842e4b520STomohiro Misono 233942e4b520STomohiro Misono kfree(rootrefs); 234042e4b520STomohiro Misono 234142e4b520STomohiro Misono return ret; 234242e4b520STomohiro Misono } 234342e4b520STomohiro Misono 234476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2345949964c9SMarcos Paulo de Souza void __user *arg, 2346949964c9SMarcos Paulo de Souza bool destroy_v2) 234776dda93cSYan, Zheng { 234854563d41SAl Viro struct dentry *parent = file->f_path.dentry; 23490b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 235076dda93cSYan, Zheng struct dentry *dentry; 23512b0143b5SDavid Howells struct inode *dir = d_inode(parent); 235276dda93cSYan, Zheng struct inode *inode; 235376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 235476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2355949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2356949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 23574609e1f1SChristian Brauner struct mnt_idmap *idmap = file_mnt_idmap(file); 2358949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2359949964c9SMarcos Paulo de Souza int subvol_namelen; 236076dda93cSYan, Zheng int err = 0; 2361949964c9SMarcos Paulo de Souza bool destroy_parent = false; 236276dda93cSYan, Zheng 2363813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 2364813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2365813febdbSJosef Bacik btrfs_err(fs_info, 2366813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 2367813febdbSJosef Bacik return -EOPNOTSUPP; 2368813febdbSJosef Bacik } 2369813febdbSJosef Bacik 2370949964c9SMarcos Paulo de Souza if (destroy_v2) { 2371949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2372949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2373949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2374325c50e3SJeff Mahoney 2375949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2376949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2377949964c9SMarcos Paulo de Souza goto out; 2378949964c9SMarcos Paulo de Souza } 237976dda93cSYan, Zheng 2380949964c9SMarcos Paulo de Souza /* 2381949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2382949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2383949964c9SMarcos Paulo de Souza */ 2384949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2385949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2386949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2387949964c9SMarcos Paulo de Souza 2388949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2389949964c9SMarcos Paulo de Souza if (err) 2390949964c9SMarcos Paulo de Souza goto out; 2391949964c9SMarcos Paulo de Souza } else { 2392aabb34e7SChristian Brauner struct inode *old_dir; 2393c4ed533bSChristian Brauner 2394949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 239576dda93cSYan, Zheng err = -EINVAL; 239676dda93cSYan, Zheng goto out; 239776dda93cSYan, Zheng } 239876dda93cSYan, Zheng 2399a561be71SAl Viro err = mnt_want_write_file(file); 240076dda93cSYan, Zheng if (err) 240176dda93cSYan, Zheng goto out; 240276dda93cSYan, Zheng 2403949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2404949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2405b307f06dSDavid Sterba vol_args2->subvolid, 0); 2406949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2407949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2408949964c9SMarcos Paulo de Souza goto out_drop_write; 2409949964c9SMarcos Paulo de Souza } 2410949964c9SMarcos Paulo de Souza 2411949964c9SMarcos Paulo de Souza /* 2412949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2413949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2414949964c9SMarcos Paulo de Souza */ 2415949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2416949964c9SMarcos Paulo de Souza 2417949964c9SMarcos Paulo de Souza /* 2418949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2419949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2420949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2421949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2422949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2423949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2424949964c9SMarcos Paulo de Souza */ 2425949964c9SMarcos Paulo de Souza dput(dentry); 2426949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2427949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2428949964c9SMarcos Paulo de Souza goto out_drop_write; 2429949964c9SMarcos Paulo de Souza } 2430aabb34e7SChristian Brauner old_dir = dir; 2431949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2432949964c9SMarcos Paulo de Souza 2433949964c9SMarcos Paulo de Souza /* 2434949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2435949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2436949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2437949964c9SMarcos Paulo de Souza * new parent dentry. 2438949964c9SMarcos Paulo de Souza */ 2439949964c9SMarcos Paulo de Souza destroy_parent = true; 2440949964c9SMarcos Paulo de Souza 2441aabb34e7SChristian Brauner /* 2442aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 2443aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 2444aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 2445aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 2446aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 2447aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 2448aabb34e7SChristian Brauner * to delete without an idmapped mount. 2449aabb34e7SChristian Brauner */ 24504609e1f1SChristian Brauner if (old_dir != dir && idmap != &nop_mnt_idmap) { 2451aabb34e7SChristian Brauner err = -EOPNOTSUPP; 2452aabb34e7SChristian Brauner goto free_parent; 2453aabb34e7SChristian Brauner } 2454aabb34e7SChristian Brauner 2455949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2456949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2457949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2458949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2459949964c9SMarcos Paulo de Souza goto free_parent; 2460949964c9SMarcos Paulo de Souza } 24611a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 2462949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2463949964c9SMarcos Paulo de Souza } 2464949964c9SMarcos Paulo de Souza } else { 2465949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2466949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2467949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2468949964c9SMarcos Paulo de Souza 2469949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2470949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2471949964c9SMarcos Paulo de Souza 2472949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2473949964c9SMarcos Paulo de Souza if (err) 2474949964c9SMarcos Paulo de Souza goto out; 2475949964c9SMarcos Paulo de Souza } 2476949964c9SMarcos Paulo de Souza 2477949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2478949964c9SMarcos Paulo de Souza 2479949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2480949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2481949964c9SMarcos Paulo de Souza err = -EINVAL; 2482949964c9SMarcos Paulo de Souza goto free_subvol_name; 2483949964c9SMarcos Paulo de Souza } 2484949964c9SMarcos Paulo de Souza 2485949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2486949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2487949964c9SMarcos Paulo de Souza goto free_subvol_name; 2488949964c9SMarcos Paulo de Souza } 2489521e0546SDavid Sterba 249000235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 249100235411SAl Viro if (err == -EINTR) 2492949964c9SMarcos Paulo de Souza goto free_subvol_name; 24934609e1f1SChristian Brauner dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen); 249476dda93cSYan, Zheng if (IS_ERR(dentry)) { 249576dda93cSYan, Zheng err = PTR_ERR(dentry); 249676dda93cSYan, Zheng goto out_unlock_dir; 249776dda93cSYan, Zheng } 249876dda93cSYan, Zheng 24992b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 250076dda93cSYan, Zheng err = -ENOENT; 250176dda93cSYan, Zheng goto out_dput; 250276dda93cSYan, Zheng } 250376dda93cSYan, Zheng 25042b0143b5SDavid Howells inode = d_inode(dentry); 25054260f7c7SSage Weil dest = BTRFS_I(inode)->root; 25064260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 25074260f7c7SSage Weil /* 25084260f7c7SSage Weil * Regular user. Only allow this with a special mount 25094260f7c7SSage Weil * option, when the user has write+exec access to the 25104260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 25114260f7c7SSage Weil * allowed. 25124260f7c7SSage Weil * 25134260f7c7SSage Weil * Note that this is _not_ check that the subvol is 25144260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 25154260f7c7SSage Weil * otherwise be able to delete. 25164260f7c7SSage Weil * 25174260f7c7SSage Weil * Users who want to delete empty subvols should try 25184260f7c7SSage Weil * rmdir(2). 25194260f7c7SSage Weil */ 25204260f7c7SSage Weil err = -EPERM; 25210b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 25224260f7c7SSage Weil goto out_dput; 25234260f7c7SSage Weil 25244260f7c7SSage Weil /* 25254260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 25264260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 25274260f7c7SSage Weil * must be called on the dentry referencing the root 25284260f7c7SSage Weil * of the subvol, not a random directory contained 25294260f7c7SSage Weil * within it. 25304260f7c7SSage Weil */ 25314260f7c7SSage Weil err = -EINVAL; 25324260f7c7SSage Weil if (root == dest) 25334260f7c7SSage Weil goto out_dput; 25344260f7c7SSage Weil 25354609e1f1SChristian Brauner err = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC); 25364260f7c7SSage Weil if (err) 25374260f7c7SSage Weil goto out_dput; 25385c39da5bSMiao Xie } 25394260f7c7SSage Weil 25405c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 25414609e1f1SChristian Brauner err = btrfs_may_delete(idmap, dir, dentry, 1); 25424260f7c7SSage Weil if (err) 25434260f7c7SSage Weil goto out_dput; 25444260f7c7SSage Weil 25454a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 254676dda93cSYan, Zheng err = -EINVAL; 254776dda93cSYan, Zheng goto out_dput; 254876dda93cSYan, Zheng } 254976dda93cSYan, Zheng 255029b6352bSDavid Sterba btrfs_inode_lock(BTRFS_I(inode), 0); 25513c4f91e2SDavid Sterba err = btrfs_delete_subvolume(BTRFS_I(dir), dentry); 2552e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(inode), 0); 2553a37d9a17SAmir Goldstein if (!err) 2554a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 2555fa6ac876SLiu Bo 255676dda93cSYan, Zheng out_dput: 255776dda93cSYan, Zheng dput(dentry); 255876dda93cSYan, Zheng out_unlock_dir: 2559e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(dir), 0); 2560949964c9SMarcos Paulo de Souza free_subvol_name: 2561949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 2562949964c9SMarcos Paulo de Souza free_parent: 2563949964c9SMarcos Paulo de Souza if (destroy_parent) 2564949964c9SMarcos Paulo de Souza dput(parent); 256500235411SAl Viro out_drop_write: 25662a79f17eSAl Viro mnt_drop_write_file(file); 256776dda93cSYan, Zheng out: 2568949964c9SMarcos Paulo de Souza kfree(vol_args2); 256976dda93cSYan, Zheng kfree(vol_args); 257076dda93cSYan, Zheng return err; 257176dda93cSYan, Zheng } 257276dda93cSYan, Zheng 25731e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2574f46b5a66SChristoph Hellwig { 2575496ad9aaSAl Viro struct inode *inode = file_inode(file); 2576f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2577c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 2578c146afadSYan Zheng int ret; 2579c146afadSYan Zheng 258025122d15SIlya Dryomov ret = mnt_want_write_file(file); 258125122d15SIlya Dryomov if (ret) 258225122d15SIlya Dryomov return ret; 2583b83cc969SLi Zefan 258425122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 258525122d15SIlya Dryomov ret = -EROFS; 258625122d15SIlya Dryomov goto out; 25875ac00addSStefan Behrens } 2588f46b5a66SChristoph Hellwig 2589f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2590f46b5a66SChristoph Hellwig case S_IFDIR: 2591e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2592e441d54dSChris Mason ret = -EPERM; 2593e441d54dSChris Mason goto out; 2594e441d54dSChris Mason } 2595de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 2596f46b5a66SChristoph Hellwig break; 2597f46b5a66SChristoph Hellwig case S_IFREG: 2598616d374eSAdam Borowski /* 2599616d374eSAdam Borowski * Note that this does not check the file descriptor for write 2600616d374eSAdam Borowski * access. This prevents defragmenting executables that are 2601616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 2602616d374eSAdam Borowski */ 2603616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 26044609e1f1SChristian Brauner inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) { 2605616d374eSAdam Borowski ret = -EPERM; 2606e441d54dSChris Mason goto out; 2607e441d54dSChris Mason } 26081e701a32SChris Mason 26091e701a32SChris Mason if (argp) { 2610c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 26111e701a32SChris Mason ret = -EFAULT; 2612683be16eSDan Carpenter goto out; 26131e701a32SChris Mason } 26145556a872SQu Wenruo if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) { 26155556a872SQu Wenruo ret = -EOPNOTSUPP; 26165556a872SQu Wenruo goto out; 26175556a872SQu Wenruo } 26181e701a32SChris Mason /* compression requires us to start the IO */ 2619c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 2620c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 2621c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 26221e701a32SChris Mason } 26231e701a32SChris Mason } else { 26241e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 2625c853a578SGoldwyn Rodrigues range.len = (u64)-1; 26261e701a32SChris Mason } 26271ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 2628c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 26294cb5300bSChris Mason if (ret > 0) 26304cb5300bSChris Mason ret = 0; 2631f46b5a66SChristoph Hellwig break; 26328929ecfaSYan, Zheng default: 26338929ecfaSYan, Zheng ret = -EINVAL; 2634f46b5a66SChristoph Hellwig } 2635e441d54dSChris Mason out: 263625122d15SIlya Dryomov mnt_drop_write_file(file); 2637e441d54dSChris Mason return ret; 2638f46b5a66SChristoph Hellwig } 2639f46b5a66SChristoph Hellwig 26402ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 2641f46b5a66SChristoph Hellwig { 2642f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2643a174c0a2SNikolay Borisov bool restore_op = false; 2644f46b5a66SChristoph Hellwig int ret; 2645f46b5a66SChristoph Hellwig 2646e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2647e441d54dSChris Mason return -EPERM; 2648e441d54dSChris Mason 2649914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2650914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 2651914a519bSJosef Bacik return -EINVAL; 2652914a519bSJosef Bacik } 2653914a519bSJosef Bacik 2654a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 2655a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 2656e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2657c9e9f97bSIlya Dryomov 2658a174c0a2SNikolay Borisov /* 2659a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 2660a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 2661a174c0a2SNikolay Borisov * back the paused balance 2662a174c0a2SNikolay Borisov */ 2663a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 2664a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 2665a174c0a2SNikolay Borisov restore_op = true; 2666a174c0a2SNikolay Borisov } 2667a174c0a2SNikolay Borisov 2668dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2669c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2670c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2671c9e9f97bSIlya Dryomov goto out; 2672c9e9f97bSIlya Dryomov } 2673f46b5a66SChristoph Hellwig 26745516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 26752ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 2676f46b5a66SChristoph Hellwig 267743d20761SAnand Jain if (!ret) 26780b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 267943d20761SAnand Jain 2680f46b5a66SChristoph Hellwig kfree(vol_args); 2681c9e9f97bSIlya Dryomov out: 2682a174c0a2SNikolay Borisov if (restore_op) 2683a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 2684a174c0a2SNikolay Borisov else 2685c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2686f46b5a66SChristoph Hellwig return ret; 2687f46b5a66SChristoph Hellwig } 2688f46b5a66SChristoph Hellwig 26896b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 2690f46b5a66SChristoph Hellwig { 26911a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 26920b246afaSJeff Mahoney struct inode *inode = file_inode(file); 26930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26946b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 26953fa421deSJosef Bacik struct block_device *bdev = NULL; 26962736e8eeSChristoph Hellwig void *holder; 2697f46b5a66SChristoph Hellwig int ret; 269867ae34b6SDavid Sterba bool cancel = false; 2699f46b5a66SChristoph Hellwig 2700e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2701e441d54dSChris Mason return -EPERM; 2702e441d54dSChris Mason 2703dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2704d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 2705d815b3f2SDan Carpenter return PTR_ERR(vol_args); 2706f46b5a66SChristoph Hellwig 2707748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 2708fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 2709fd4e994bSOmar Sandoval goto out; 2710fd4e994bSOmar Sandoval } 27111a15eb72SJosef Bacik 27126b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 27131a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 27141a15eb72SJosef Bacik args.devid = vol_args->devid; 27151a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 271667ae34b6SDavid Sterba cancel = true; 27171a15eb72SJosef Bacik } else { 27181a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 27191a15eb72SJosef Bacik if (ret) 27201a15eb72SJosef Bacik goto out; 27211a15eb72SJosef Bacik } 27221a15eb72SJosef Bacik 27231a15eb72SJosef Bacik ret = mnt_want_write_file(file); 27241a15eb72SJosef Bacik if (ret) 27251a15eb72SJosef Bacik goto out; 272667ae34b6SDavid Sterba 272767ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 272867ae34b6SDavid Sterba cancel); 272967ae34b6SDavid Sterba if (ret) 27301a15eb72SJosef Bacik goto err_drop; 273167ae34b6SDavid Sterba 27321a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 27332736e8eeSChristoph Hellwig ret = btrfs_rm_device(fs_info, &args, &bdev, &holder); 273467ae34b6SDavid Sterba 2735c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2736183860f6SAnand Jain 27376b526ed7SAnand Jain if (!ret) { 2738735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 27390b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 27406b526ed7SAnand Jain vol_args->devid); 27416b526ed7SAnand Jain else 27420b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 27436b526ed7SAnand Jain vol_args->name); 27446b526ed7SAnand Jain } 2745c47ca32dSDan Carpenter err_drop: 27464ac20c70SIlya Dryomov mnt_drop_write_file(file); 27473fa421deSJosef Bacik if (bdev) 27482736e8eeSChristoph Hellwig blkdev_put(bdev, holder); 27491a15eb72SJosef Bacik out: 27501a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27511a15eb72SJosef Bacik kfree(vol_args); 2752f46b5a66SChristoph Hellwig return ret; 2753f46b5a66SChristoph Hellwig } 2754f46b5a66SChristoph Hellwig 2755f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2756f46b5a66SChristoph Hellwig { 27571a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 27580b246afaSJeff Mahoney struct inode *inode = file_inode(file); 27590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2760f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 27613fa421deSJosef Bacik struct block_device *bdev = NULL; 27622736e8eeSChristoph Hellwig void *holder; 2763f46b5a66SChristoph Hellwig int ret; 276437b45995STom Rix bool cancel = false; 2765f46b5a66SChristoph Hellwig 2766f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2767f46b5a66SChristoph Hellwig return -EPERM; 2768f46b5a66SChristoph Hellwig 27691a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 27701a15eb72SJosef Bacik if (IS_ERR(vol_args)) 27711a15eb72SJosef Bacik return PTR_ERR(vol_args); 27721a15eb72SJosef Bacik 27731a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 27741a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 27751a15eb72SJosef Bacik cancel = true; 27761a15eb72SJosef Bacik } else { 27771a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 27781a15eb72SJosef Bacik if (ret) 27791a15eb72SJosef Bacik goto out; 27801a15eb72SJosef Bacik } 27811a15eb72SJosef Bacik 2782f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 2783f46b5a66SChristoph Hellwig if (ret) 27841a15eb72SJosef Bacik goto out; 2785f46b5a66SChristoph Hellwig 278667ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 278767ae34b6SDavid Sterba cancel); 278867ae34b6SDavid Sterba if (ret == 0) { 27892736e8eeSChristoph Hellwig ret = btrfs_rm_device(fs_info, &args, &bdev, &holder); 2790f46b5a66SChristoph Hellwig if (!ret) 27910b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 2792c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 279367ae34b6SDavid Sterba } 279467ae34b6SDavid Sterba 2795f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 27963fa421deSJosef Bacik if (bdev) 27972736e8eeSChristoph Hellwig blkdev_put(bdev, holder); 27981a15eb72SJosef Bacik out: 27991a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 28001a15eb72SJosef Bacik kfree(vol_args); 2801f46b5a66SChristoph Hellwig return ret; 2802f46b5a66SChristoph Hellwig } 2803f46b5a66SChristoph Hellwig 28042ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 28052ff7e61eSJeff Mahoney void __user *arg) 2806475f6387SJan Schmidt { 2807027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2808475f6387SJan Schmidt struct btrfs_device *device; 28090b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 2810137c5418SJohannes Thumshirn u64 flags_in; 2811027ed2f0SLi Zefan int ret = 0; 2812475f6387SJan Schmidt 2813137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 2814137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 2815137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 2816137c5418SJohannes Thumshirn 2817137c5418SJohannes Thumshirn flags_in = fi_args->flags; 2818137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 2819027ed2f0SLi Zefan 2820d03262c7SDavid Sterba rcu_read_lock(); 2821027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2822475f6387SJan Schmidt 2823d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2824027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2825027ed2f0SLi Zefan fi_args->max_id = device->devid; 2826475f6387SJan Schmidt } 2827d03262c7SDavid Sterba rcu_read_unlock(); 2828475f6387SJan Schmidt 2829de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 2830bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 2831bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 2832bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 283380a773fbSDavid Sterba 2834137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 2835137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 2836137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 2837137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 2838137c5418SJohannes Thumshirn } 2839137c5418SJohannes Thumshirn 28400fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 28410fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 28420fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 28430fb408a5SJohannes Thumshirn } 28440fb408a5SJohannes Thumshirn 284549bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 284649bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 284749bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 284849bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 284949bac897SJohannes Thumshirn } 285049bac897SJohannes Thumshirn 2851027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2852027ed2f0SLi Zefan ret = -EFAULT; 2853475f6387SJan Schmidt 2854027ed2f0SLi Zefan kfree(fi_args); 2855027ed2f0SLi Zefan return ret; 2856475f6387SJan Schmidt } 2857475f6387SJan Schmidt 28582ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 28592ff7e61eSJeff Mahoney void __user *arg) 2860475f6387SJan Schmidt { 2861562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 2862475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2863475f6387SJan Schmidt struct btrfs_device *dev; 2864475f6387SJan Schmidt int ret = 0; 2865475f6387SJan Schmidt 2866475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2867475f6387SJan Schmidt if (IS_ERR(di_args)) 2868475f6387SJan Schmidt return PTR_ERR(di_args); 2869475f6387SJan Schmidt 2870562d7b15SJosef Bacik args.devid = di_args->devid; 2871dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2872562d7b15SJosef Bacik args.uuid = di_args->uuid; 2873475f6387SJan Schmidt 2874c5593ca3SDavid Sterba rcu_read_lock(); 2875562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 2876475f6387SJan Schmidt if (!dev) { 2877475f6387SJan Schmidt ret = -ENODEV; 2878475f6387SJan Schmidt goto out; 2879475f6387SJan Schmidt } 2880475f6387SJan Schmidt 2881475f6387SJan Schmidt di_args->devid = dev->devid; 28827cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 28837cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2884475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 28852943868aSQu Wenruo memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 288663d5429fSArtem Chernyshev if (dev->name) 288763d5429fSArtem Chernyshev strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); 288863d5429fSArtem Chernyshev else 288999ba55adSStefan Behrens di_args->path[0] = '\0'; 2890475f6387SJan Schmidt 2891475f6387SJan Schmidt out: 2892c5593ca3SDavid Sterba rcu_read_unlock(); 2893475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2894475f6387SJan Schmidt ret = -EFAULT; 2895475f6387SJan Schmidt 2896475f6387SJan Schmidt kfree(di_args); 2897475f6387SJan Schmidt return ret; 2898475f6387SJan Schmidt } 2899475f6387SJan Schmidt 29006ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 29016ef5ed0dSJosef Bacik { 2902496ad9aaSAl Viro struct inode *inode = file_inode(file); 29030b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 29046ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 29056ef5ed0dSJosef Bacik struct btrfs_root *new_root; 29066ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 29076ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 29082a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 29096ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 29106db75318SSweet Tea Dorminy struct fscrypt_str name = FSTR_INIT("default", 7); 29116ef5ed0dSJosef Bacik u64 objectid = 0; 29126ef5ed0dSJosef Bacik u64 dir_id; 29133c04ce01SMiao Xie int ret; 29146ef5ed0dSJosef Bacik 29156ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 29166ef5ed0dSJosef Bacik return -EPERM; 29176ef5ed0dSJosef Bacik 29183c04ce01SMiao Xie ret = mnt_want_write_file(file); 29193c04ce01SMiao Xie if (ret) 29203c04ce01SMiao Xie return ret; 29213c04ce01SMiao Xie 29223c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29233c04ce01SMiao Xie ret = -EFAULT; 29243c04ce01SMiao Xie goto out; 29253c04ce01SMiao Xie } 29266ef5ed0dSJosef Bacik 29276ef5ed0dSJosef Bacik if (!objectid) 29281cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 29296ef5ed0dSJosef Bacik 293056e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 29313c04ce01SMiao Xie if (IS_ERR(new_root)) { 29323c04ce01SMiao Xie ret = PTR_ERR(new_root); 29333c04ce01SMiao Xie goto out; 29343c04ce01SMiao Xie } 29352a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 29362a2b5d62SJosef Bacik ret = -ENOENT; 29372a2b5d62SJosef Bacik goto out_free; 29382a2b5d62SJosef Bacik } 29396ef5ed0dSJosef Bacik 29406ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29413c04ce01SMiao Xie if (!path) { 29423c04ce01SMiao Xie ret = -ENOMEM; 29432a2b5d62SJosef Bacik goto out_free; 29443c04ce01SMiao Xie } 29456ef5ed0dSJosef Bacik 29466ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 294798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29483c04ce01SMiao Xie ret = PTR_ERR(trans); 29492a2b5d62SJosef Bacik goto out_free; 29506ef5ed0dSJosef Bacik } 29516ef5ed0dSJosef Bacik 29520b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 29530b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 2954e43eec81SSweet Tea Dorminy dir_id, &name, 1); 2955cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29562a2b5d62SJosef Bacik btrfs_release_path(path); 29573a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29580b246afaSJeff Mahoney btrfs_err(fs_info, 29595d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 29603c04ce01SMiao Xie ret = -ENOENT; 29612a2b5d62SJosef Bacik goto out_free; 29626ef5ed0dSJosef Bacik } 29636ef5ed0dSJosef Bacik 29646ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29656ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 2966d5e09e38SFilipe Manana btrfs_mark_buffer_dirty(trans, path->nodes[0]); 29672a2b5d62SJosef Bacik btrfs_release_path(path); 29686ef5ed0dSJosef Bacik 29690b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 29703a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29712a2b5d62SJosef Bacik out_free: 297200246528SJosef Bacik btrfs_put_root(new_root); 29732a2b5d62SJosef Bacik btrfs_free_path(path); 29743c04ce01SMiao Xie out: 29753c04ce01SMiao Xie mnt_drop_write_file(file); 29763c04ce01SMiao Xie return ret; 29776ef5ed0dSJosef Bacik } 29786ef5ed0dSJosef Bacik 2979c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 2980bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2981bf5fc093SJosef Bacik { 298232da5386SDavid Sterba struct btrfs_block_group *block_group; 2983bf5fc093SJosef Bacik 2984bf5fc093SJosef Bacik space->total_bytes = 0; 2985bf5fc093SJosef Bacik space->used_bytes = 0; 2986bf5fc093SJosef Bacik space->flags = 0; 2987bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2988bf5fc093SJosef Bacik space->flags = block_group->flags; 2989b3470b5dSDavid Sterba space->total_bytes += block_group->length; 2990bf38be65SDavid Sterba space->used_bytes += block_group->used; 2991bf5fc093SJosef Bacik } 2992bf5fc093SJosef Bacik } 2993bf5fc093SJosef Bacik 29942ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 29952ff7e61eSJeff Mahoney void __user *arg) 29961406e432SJosef Bacik { 29979147b9deSJosef Bacik struct btrfs_ioctl_space_args space_args = { 0 }; 29981406e432SJosef Bacik struct btrfs_ioctl_space_info space; 29991406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 30007fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 300113f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 30021406e432SJosef Bacik struct btrfs_space_info *info; 3003315d8e98SColin Ian King static const u64 types[] = { 3004315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3005bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3006bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3007315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3008315d8e98SColin Ian King }; 3009bf5fc093SJosef Bacik int num_types = 4; 30107fde62bfSChris Mason int alloc_size; 30111406e432SJosef Bacik int ret = 0; 301251788b1bSDan Rosenberg u64 slot_count = 0; 3013bf5fc093SJosef Bacik int i, c; 30141406e432SJosef Bacik 30151406e432SJosef Bacik if (copy_from_user(&space_args, 30161406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 30171406e432SJosef Bacik sizeof(space_args))) 30181406e432SJosef Bacik return -EFAULT; 30191406e432SJosef Bacik 3020bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3021bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3022bf5fc093SJosef Bacik 3023bf5fc093SJosef Bacik info = NULL; 302472804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3025bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3026bf5fc093SJosef Bacik info = tmp; 3027bf5fc093SJosef Bacik break; 3028bf5fc093SJosef Bacik } 3029bf5fc093SJosef Bacik } 30301406e432SJosef Bacik 3031bf5fc093SJosef Bacik if (!info) 3032bf5fc093SJosef Bacik continue; 3033bf5fc093SJosef Bacik 3034bf5fc093SJosef Bacik down_read(&info->groups_sem); 3035bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3036bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3037bf5fc093SJosef Bacik slot_count++; 3038bf5fc093SJosef Bacik } 3039bf5fc093SJosef Bacik up_read(&info->groups_sem); 3040bf5fc093SJosef Bacik } 3041bf5fc093SJosef Bacik 304236523e95SDavid Sterba /* 304336523e95SDavid Sterba * Global block reserve, exported as a space_info 304436523e95SDavid Sterba */ 304536523e95SDavid Sterba slot_count++; 304636523e95SDavid Sterba 30477fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30487fde62bfSChris Mason if (space_args.space_slots == 0) { 30497fde62bfSChris Mason space_args.total_spaces = slot_count; 30507fde62bfSChris Mason goto out; 30517fde62bfSChris Mason } 3052bf5fc093SJosef Bacik 305351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3054bf5fc093SJosef Bacik 30557fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3056bf5fc093SJosef Bacik 30577fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30587fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30597fde62bfSChris Mason */ 306009cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 30617fde62bfSChris Mason return -ENOMEM; 30627fde62bfSChris Mason 30637fde62bfSChris Mason space_args.total_spaces = 0; 30648d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 30657fde62bfSChris Mason if (!dest) 30667fde62bfSChris Mason return -ENOMEM; 30677fde62bfSChris Mason dest_orig = dest; 30687fde62bfSChris Mason 30697fde62bfSChris Mason /* now we have a buffer to copy into */ 3070bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3071bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3072bf5fc093SJosef Bacik 307351788b1bSDan Rosenberg if (!slot_count) 307451788b1bSDan Rosenberg break; 307551788b1bSDan Rosenberg 3076bf5fc093SJosef Bacik info = NULL; 307772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3078bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3079bf5fc093SJosef Bacik info = tmp; 30807fde62bfSChris Mason break; 3081bf5fc093SJosef Bacik } 3082bf5fc093SJosef Bacik } 30837fde62bfSChris Mason 3084bf5fc093SJosef Bacik if (!info) 3085bf5fc093SJosef Bacik continue; 3086bf5fc093SJosef Bacik down_read(&info->groups_sem); 3087bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3088bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3089c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3090c065f5b1SSu Yue &space); 30917fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 30921406e432SJosef Bacik dest++; 30931406e432SJosef Bacik space_args.total_spaces++; 309451788b1bSDan Rosenberg slot_count--; 30951406e432SJosef Bacik } 309651788b1bSDan Rosenberg if (!slot_count) 309751788b1bSDan Rosenberg break; 3098bf5fc093SJosef Bacik } 3099bf5fc093SJosef Bacik up_read(&info->groups_sem); 3100bf5fc093SJosef Bacik } 31011406e432SJosef Bacik 310236523e95SDavid Sterba /* 310336523e95SDavid Sterba * Add global block reserve 310436523e95SDavid Sterba */ 310536523e95SDavid Sterba if (slot_count) { 31060b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 310736523e95SDavid Sterba 310836523e95SDavid Sterba spin_lock(&block_rsv->lock); 310936523e95SDavid Sterba space.total_bytes = block_rsv->size; 311036523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 311136523e95SDavid Sterba spin_unlock(&block_rsv->lock); 311236523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 311336523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 311436523e95SDavid Sterba space_args.total_spaces++; 311536523e95SDavid Sterba } 311636523e95SDavid Sterba 31172eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 31187fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 31197fde62bfSChris Mason 31207fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 31217fde62bfSChris Mason ret = -EFAULT; 31227fde62bfSChris Mason 31237fde62bfSChris Mason kfree(dest_orig); 31247fde62bfSChris Mason out: 31257fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31261406e432SJosef Bacik ret = -EFAULT; 31271406e432SJosef Bacik 31281406e432SJosef Bacik return ret; 31291406e432SJosef Bacik } 31301406e432SJosef Bacik 31319a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31329a8c28beSMiao Xie void __user *argp) 313346204592SSage Weil { 313446204592SSage Weil struct btrfs_trans_handle *trans; 313546204592SSage Weil u64 transid; 313646204592SSage Weil 3137edc72881SQu Wenruo /* 3138edc72881SQu Wenruo * Start orphan cleanup here for the given root in case it hasn't been 3139edc72881SQu Wenruo * started already by other means. Errors are handled in the other 3140edc72881SQu Wenruo * functions during transaction commit. 3141edc72881SQu Wenruo */ 3142edc72881SQu Wenruo btrfs_orphan_cleanup(root); 3143edc72881SQu Wenruo 3144d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3145ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3146ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 314798d5dc13STsutomu Itoh return PTR_ERR(trans); 3148ff7c1d33SMiao Xie 3149ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3150ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3151ff7c1d33SMiao Xie goto out; 3152ff7c1d33SMiao Xie } 315346204592SSage Weil transid = trans->transid; 3154fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3155ff7c1d33SMiao Xie out: 315646204592SSage Weil if (argp) 315746204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 315846204592SSage Weil return -EFAULT; 315946204592SSage Weil return 0; 316046204592SSage Weil } 316146204592SSage Weil 31622ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 31639a8c28beSMiao Xie void __user *argp) 316446204592SSage Weil { 316512df6a62STom Rix /* By default wait for the current transaction. */ 316612df6a62STom Rix u64 transid = 0; 316746204592SSage Weil 316812df6a62STom Rix if (argp) 316946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 317046204592SSage Weil return -EFAULT; 317112df6a62STom Rix 31722ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 317346204592SSage Weil } 317446204592SSage Weil 3175b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3176475f6387SJan Schmidt { 31770b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3178475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3179b8e95489SMiao Xie int ret; 3180475f6387SJan Schmidt 3181475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3182475f6387SJan Schmidt return -EPERM; 3183475f6387SJan Schmidt 3184da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3185da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 3186da32c6d5SJosef Bacik return -EINVAL; 3187da32c6d5SJosef Bacik } 3188da32c6d5SJosef Bacik 3189475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3190475f6387SJan Schmidt if (IS_ERR(sa)) 3191475f6387SJan Schmidt return PTR_ERR(sa); 3192475f6387SJan Schmidt 3193604e6681SQu Wenruo if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) { 3194604e6681SQu Wenruo ret = -EOPNOTSUPP; 3195604e6681SQu Wenruo goto out; 3196604e6681SQu Wenruo } 3197604e6681SQu Wenruo 3198b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3199b8e95489SMiao Xie ret = mnt_want_write_file(file); 3200b8e95489SMiao Xie if (ret) 3201b8e95489SMiao Xie goto out; 3202b8e95489SMiao Xie } 3203b8e95489SMiao Xie 32040b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 320563a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 320663a212abSStefan Behrens 0); 3207475f6387SJan Schmidt 32085afe6ce7SFilipe Manana /* 32095afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 32105afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 32115afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 32125afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 32135afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 32145afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 32155afe6ce7SFilipe Manana * previously (btrfs-progs does this). 32165afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 32175afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 32185afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 32195afe6ce7SFilipe Manana */ 32205afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3221475f6387SJan Schmidt ret = -EFAULT; 3222475f6387SJan Schmidt 3223b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3224b8e95489SMiao Xie mnt_drop_write_file(file); 3225b8e95489SMiao Xie out: 3226475f6387SJan Schmidt kfree(sa); 3227475f6387SJan Schmidt return ret; 3228475f6387SJan Schmidt } 3229475f6387SJan Schmidt 32302ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3231475f6387SJan Schmidt { 3232475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3233475f6387SJan Schmidt return -EPERM; 3234475f6387SJan Schmidt 32352ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3236475f6387SJan Schmidt } 3237475f6387SJan Schmidt 32382ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3239475f6387SJan Schmidt void __user *arg) 3240475f6387SJan Schmidt { 3241475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3242475f6387SJan Schmidt int ret; 3243475f6387SJan Schmidt 3244475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3245475f6387SJan Schmidt return -EPERM; 3246475f6387SJan Schmidt 3247475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3248475f6387SJan Schmidt if (IS_ERR(sa)) 3249475f6387SJan Schmidt return PTR_ERR(sa); 3250475f6387SJan Schmidt 32512ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3252475f6387SJan Schmidt 32534fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3254475f6387SJan Schmidt ret = -EFAULT; 3255475f6387SJan Schmidt 3256475f6387SJan Schmidt kfree(sa); 3257475f6387SJan Schmidt return ret; 3258475f6387SJan Schmidt } 3259475f6387SJan Schmidt 32602ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3261b27f7c0cSDavid Sterba void __user *arg) 3262c11d2c23SStefan Behrens { 3263c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3264c11d2c23SStefan Behrens int ret; 3265c11d2c23SStefan Behrens 3266c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3267c11d2c23SStefan Behrens if (IS_ERR(sa)) 3268c11d2c23SStefan Behrens return PTR_ERR(sa); 3269c11d2c23SStefan Behrens 3270b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3271b27f7c0cSDavid Sterba kfree(sa); 3272b27f7c0cSDavid Sterba return -EPERM; 3273b27f7c0cSDavid Sterba } 3274b27f7c0cSDavid Sterba 32752ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3276c11d2c23SStefan Behrens 3277eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3278c11d2c23SStefan Behrens ret = -EFAULT; 3279c11d2c23SStefan Behrens 3280c11d2c23SStefan Behrens kfree(sa); 3281c11d2c23SStefan Behrens return ret; 3282c11d2c23SStefan Behrens } 3283c11d2c23SStefan Behrens 32842ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 32852ff7e61eSJeff Mahoney void __user *arg) 32863f6bcfbdSStefan Behrens { 32873f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32883f6bcfbdSStefan Behrens int ret; 32893f6bcfbdSStefan Behrens 32903f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32913f6bcfbdSStefan Behrens return -EPERM; 32923f6bcfbdSStefan Behrens 3293914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3294914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 3295914a519bSJosef Bacik return -EINVAL; 3296914a519bSJosef Bacik } 3297914a519bSJosef Bacik 32983f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32993f6bcfbdSStefan Behrens if (IS_ERR(p)) 33003f6bcfbdSStefan Behrens return PTR_ERR(p); 33013f6bcfbdSStefan Behrens 33023f6bcfbdSStefan Behrens switch (p->cmd) { 33033f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3304bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3305adfa97cbSIlya Dryomov ret = -EROFS; 3306adfa97cbSIlya Dryomov goto out; 3307adfa97cbSIlya Dryomov } 3308c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3309e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 33103f6bcfbdSStefan Behrens } else { 33112ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3312c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 33133f6bcfbdSStefan Behrens } 33143f6bcfbdSStefan Behrens break; 33153f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 33160b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 33173f6bcfbdSStefan Behrens ret = 0; 33183f6bcfbdSStefan Behrens break; 33193f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 332017d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 332197282031SAnand Jain ret = 0; 33223f6bcfbdSStefan Behrens break; 33233f6bcfbdSStefan Behrens default: 33243f6bcfbdSStefan Behrens ret = -EINVAL; 33253f6bcfbdSStefan Behrens break; 33263f6bcfbdSStefan Behrens } 33273f6bcfbdSStefan Behrens 3328d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 33293f6bcfbdSStefan Behrens ret = -EFAULT; 3330adfa97cbSIlya Dryomov out: 33313f6bcfbdSStefan Behrens kfree(p); 33323f6bcfbdSStefan Behrens return ret; 33333f6bcfbdSStefan Behrens } 33343f6bcfbdSStefan Behrens 3335d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3336d7728c96SJan Schmidt { 3337d7728c96SJan Schmidt int ret = 0; 3338d7728c96SJan Schmidt int i; 3339740c3d22SChris Mason u64 rel_ptr; 3340d7728c96SJan Schmidt int size; 3341806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3342d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3343d7728c96SJan Schmidt struct btrfs_path *path; 3344d7728c96SJan Schmidt 334582b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3346d7728c96SJan Schmidt return -EPERM; 3347d7728c96SJan Schmidt 3348d7728c96SJan Schmidt path = btrfs_alloc_path(); 3349d7728c96SJan Schmidt if (!path) { 3350d7728c96SJan Schmidt ret = -ENOMEM; 3351d7728c96SJan Schmidt goto out; 3352d7728c96SJan Schmidt } 3353d7728c96SJan Schmidt 3354d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3355d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3356d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3357d7728c96SJan Schmidt ipa = NULL; 3358d7728c96SJan Schmidt goto out; 3359d7728c96SJan Schmidt } 3360d7728c96SJan Schmidt 3361d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3362d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3363d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3364d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3365d7728c96SJan Schmidt ipath = NULL; 3366d7728c96SJan Schmidt goto out; 3367d7728c96SJan Schmidt } 3368d7728c96SJan Schmidt 3369d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3370d7728c96SJan Schmidt if (ret < 0) 3371d7728c96SJan Schmidt goto out; 3372d7728c96SJan Schmidt 3373d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3374745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3375745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3376740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3377d7728c96SJan Schmidt } 3378d7728c96SJan Schmidt 33798cf96b40SAnand Jain btrfs_free_path(path); 33808cf96b40SAnand Jain path = NULL; 3381718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3382718dc5faSOmar Sandoval ipath->fspath, size); 3383d7728c96SJan Schmidt if (ret) { 3384d7728c96SJan Schmidt ret = -EFAULT; 3385d7728c96SJan Schmidt goto out; 3386d7728c96SJan Schmidt } 3387d7728c96SJan Schmidt 3388d7728c96SJan Schmidt out: 3389d7728c96SJan Schmidt btrfs_free_path(path); 3390d7728c96SJan Schmidt free_ipath(ipath); 3391d7728c96SJan Schmidt kfree(ipa); 3392d7728c96SJan Schmidt 3393d7728c96SJan Schmidt return ret; 3394d7728c96SJan Schmidt } 3395d7728c96SJan Schmidt 33962ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3397d24a67b2SZygo Blaxell void __user *arg, int version) 3398d7728c96SJan Schmidt { 3399d7728c96SJan Schmidt int ret = 0; 3400d7728c96SJan Schmidt int size; 3401d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3402d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3403d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3404d24a67b2SZygo Blaxell bool ignore_offset; 3405d7728c96SJan Schmidt 3406d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3407d7728c96SJan Schmidt return -EPERM; 3408d7728c96SJan Schmidt 3409d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 34107b9ea627SShailendra Verma if (IS_ERR(loi)) 34117b9ea627SShailendra Verma return PTR_ERR(loi); 3412d7728c96SJan Schmidt 3413d24a67b2SZygo Blaxell if (version == 1) { 3414d24a67b2SZygo Blaxell ignore_offset = false; 3415b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3416d24a67b2SZygo Blaxell } else { 3417d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3418d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3419d24a67b2SZygo Blaxell ret = -EINVAL; 3420d24a67b2SZygo Blaxell goto out_loi; 3421d24a67b2SZygo Blaxell } 3422d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3423d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3424d24a67b2SZygo Blaxell ret = -EINVAL; 3425d24a67b2SZygo Blaxell goto out_loi; 3426d24a67b2SZygo Blaxell } 3427d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3428b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3429d24a67b2SZygo Blaxell } 3430d24a67b2SZygo Blaxell 3431418ffb9eSAnand Jain inodes = init_data_container(size); 3432418ffb9eSAnand Jain if (IS_ERR(inodes)) { 3433418ffb9eSAnand Jain ret = PTR_ERR(inodes); 3434418ffb9eSAnand Jain goto out_loi; 3435418ffb9eSAnand Jain } 3436418ffb9eSAnand Jain 3437d7728c96SJan Schmidt path = btrfs_alloc_path(); 3438d7728c96SJan Schmidt if (!path) { 3439d7728c96SJan Schmidt ret = -ENOMEM; 3440d7728c96SJan Schmidt goto out; 3441d7728c96SJan Schmidt } 34422ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3443e3059ec0SDavid Sterba inodes, ignore_offset); 3444418ffb9eSAnand Jain btrfs_free_path(path); 3445df031f07SLiu Bo if (ret == -EINVAL) 3446d7728c96SJan Schmidt ret = -ENOENT; 3447d7728c96SJan Schmidt if (ret < 0) 3448d7728c96SJan Schmidt goto out; 3449d7728c96SJan Schmidt 3450718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3451718dc5faSOmar Sandoval size); 3452d7728c96SJan Schmidt if (ret) 3453d7728c96SJan Schmidt ret = -EFAULT; 3454d7728c96SJan Schmidt 3455d7728c96SJan Schmidt out: 3456f54de068SDavid Sterba kvfree(inodes); 3457d24a67b2SZygo Blaxell out_loi: 3458d7728c96SJan Schmidt kfree(loi); 3459d7728c96SJan Schmidt 3460d7728c96SJan Schmidt return ret; 3461d7728c96SJan Schmidt } 3462d7728c96SJan Schmidt 3463008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3464c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3465c9e9f97bSIlya Dryomov { 3466c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3467c9e9f97bSIlya Dryomov 3468c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3469c9e9f97bSIlya Dryomov 34703009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3471837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3472837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3473837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3474a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3475a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3476837d5b6eSIlya Dryomov 3477c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3478c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3479c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 348019a39dceSIlya Dryomov 348119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 348219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 348319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3484c9e9f97bSIlya Dryomov } 3485c9e9f97bSIlya Dryomov 348643dd529aSDavid Sterba /* 34877fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 34887fb10ed8SNikolay Borisov * required. 34897fb10ed8SNikolay Borisov * 34907fb10ed8SNikolay Borisov * @fs_info: the filesystem 34917fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 34927fb10ed8SNikolay Borisov * is being resumed 34937fb10ed8SNikolay Borisov * 34947fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 34957fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 34967fb10ed8SNikolay Borisov */ 34977fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 34987fb10ed8SNikolay Borisov { 34997fb10ed8SNikolay Borisov int ret; 35007fb10ed8SNikolay Borisov 35017fb10ed8SNikolay Borisov /* 35027fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 35037fb10ed8SNikolay Borisov * (1) some other op is running 35047fb10ed8SNikolay Borisov * (2) balance is running 35057fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 35067fb10ed8SNikolay Borisov */ 35077fb10ed8SNikolay Borisov while (1) { 35087fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 35097fb10ed8SNikolay Borisov *excl_acquired = true; 35107fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 35117fb10ed8SNikolay Borisov return 0; 35127fb10ed8SNikolay Borisov } 35137fb10ed8SNikolay Borisov 35147fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 35157fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 35167fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 35177fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 35187fb10ed8SNikolay Borisov /* This is (2) */ 35197fb10ed8SNikolay Borisov ret = -EINPROGRESS; 35207fb10ed8SNikolay Borisov goto out_failure; 35217fb10ed8SNikolay Borisov 35227fb10ed8SNikolay Borisov } else { 35237fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35247fb10ed8SNikolay Borisov /* 35257fb10ed8SNikolay Borisov * Lock released to allow other waiters to 35267fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 35277fb10ed8SNikolay Borisov */ 35287fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 35297fb10ed8SNikolay Borisov 35307fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 35317fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 35327fb10ed8SNikolay Borisov /* This is (3) */ 35337fb10ed8SNikolay Borisov *excl_acquired = false; 35347fb10ed8SNikolay Borisov return 0; 35357fb10ed8SNikolay Borisov } 35367fb10ed8SNikolay Borisov } 35377fb10ed8SNikolay Borisov } else { 35387fb10ed8SNikolay Borisov /* This is (1) */ 35397fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 35407fb10ed8SNikolay Borisov goto out_failure; 35417fb10ed8SNikolay Borisov } 35427fb10ed8SNikolay Borisov 35437fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35447fb10ed8SNikolay Borisov } 35457fb10ed8SNikolay Borisov 35467fb10ed8SNikolay Borisov out_failure: 35477fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35487fb10ed8SNikolay Borisov *excl_acquired = false; 35497fb10ed8SNikolay Borisov return ret; 35507fb10ed8SNikolay Borisov } 35517fb10ed8SNikolay Borisov 35529ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3553c9e9f97bSIlya Dryomov { 3554496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3555c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3556c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3557c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3558099aa972SNikolay Borisov bool need_unlock = true; 3559c9e9f97bSIlya Dryomov int ret; 3560c9e9f97bSIlya Dryomov 3561c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3562c9e9f97bSIlya Dryomov return -EPERM; 3563c9e9f97bSIlya Dryomov 3564e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35659ba1f6e4SLiu Bo if (ret) 35669ba1f6e4SLiu Bo return ret; 35679ba1f6e4SLiu Bo 3568d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 3569d8645462SNikolay Borisov if (IS_ERR(bargs)) { 3570d8645462SNikolay Borisov ret = PTR_ERR(bargs); 3571d8645462SNikolay Borisov bargs = NULL; 3572d8645462SNikolay Borisov goto out; 3573d8645462SNikolay Borisov } 3574d8645462SNikolay Borisov 3575099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 3576099aa972SNikolay Borisov if (ret) 3577ed0fb78fSIlya Dryomov goto out; 3578ed0fb78fSIlya Dryomov 3579099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 3580099aa972SNikolay Borisov 3581de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3582de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3583de322263SIlya Dryomov ret = -ENOTCONN; 3584d8645462SNikolay Borisov goto out_unlock; 3585de322263SIlya Dryomov } 3586de322263SIlya Dryomov 3587de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3588de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3589de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3590de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3591efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 3592de322263SIlya Dryomov 3593de322263SIlya Dryomov goto do_balance; 3594de322263SIlya Dryomov } 3595c9e9f97bSIlya Dryomov 3596d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 3597d8645462SNikolay Borisov ret = -EINVAL; 3598d8645462SNikolay Borisov goto out_unlock; 3599c9e9f97bSIlya Dryomov } 3600c9e9f97bSIlya Dryomov 3601ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3602837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3603d8645462SNikolay Borisov goto out_unlock; 3604837d5b6eSIlya Dryomov } 3605837d5b6eSIlya Dryomov 36068d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3607c9e9f97bSIlya Dryomov if (!bctl) { 3608c9e9f97bSIlya Dryomov ret = -ENOMEM; 3609d8645462SNikolay Borisov goto out_unlock; 3610c9e9f97bSIlya Dryomov } 3611c9e9f97bSIlya Dryomov 3612c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3613c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3614c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3615c9e9f97bSIlya Dryomov 3616c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3617de322263SIlya Dryomov do_balance: 3618c9e9f97bSIlya Dryomov /* 3619c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 3620c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 3621c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 3622c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 3623c9e9f97bSIlya Dryomov */ 3624ed0fb78fSIlya Dryomov need_unlock = false; 3625ed0fb78fSIlya Dryomov 36266fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 36270f89abf5SChristian Engelmayer bctl = NULL; 3628ed0fb78fSIlya Dryomov 362939864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 3630c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3631c9e9f97bSIlya Dryomov ret = -EFAULT; 3632c9e9f97bSIlya Dryomov } 3633c9e9f97bSIlya Dryomov 36340f89abf5SChristian Engelmayer kfree(bctl); 3635ed0fb78fSIlya Dryomov out_unlock: 3636c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3637ed0fb78fSIlya Dryomov if (need_unlock) 3638c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3639ed0fb78fSIlya Dryomov out: 3640e54bfa31SLiu Bo mnt_drop_write_file(file); 3641d8645462SNikolay Borisov kfree(bargs); 3642c9e9f97bSIlya Dryomov return ret; 3643c9e9f97bSIlya Dryomov } 3644c9e9f97bSIlya Dryomov 36452ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 3646837d5b6eSIlya Dryomov { 3647837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3648837d5b6eSIlya Dryomov return -EPERM; 3649837d5b6eSIlya Dryomov 3650837d5b6eSIlya Dryomov switch (cmd) { 3651837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 36520b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 3653a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 36540b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 3655837d5b6eSIlya Dryomov } 3656837d5b6eSIlya Dryomov 3657837d5b6eSIlya Dryomov return -EINVAL; 3658837d5b6eSIlya Dryomov } 3659837d5b6eSIlya Dryomov 36602ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 366119a39dceSIlya Dryomov void __user *arg) 366219a39dceSIlya Dryomov { 366319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 366419a39dceSIlya Dryomov int ret = 0; 366519a39dceSIlya Dryomov 366619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 366719a39dceSIlya Dryomov return -EPERM; 366819a39dceSIlya Dryomov 366919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 367019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 367119a39dceSIlya Dryomov ret = -ENOTCONN; 367219a39dceSIlya Dryomov goto out; 367319a39dceSIlya Dryomov } 367419a39dceSIlya Dryomov 36758d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 367619a39dceSIlya Dryomov if (!bargs) { 367719a39dceSIlya Dryomov ret = -ENOMEM; 367819a39dceSIlya Dryomov goto out; 367919a39dceSIlya Dryomov } 368019a39dceSIlya Dryomov 3681008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 368219a39dceSIlya Dryomov 368319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 368419a39dceSIlya Dryomov ret = -EFAULT; 368519a39dceSIlya Dryomov 368619a39dceSIlya Dryomov kfree(bargs); 368719a39dceSIlya Dryomov out: 368819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 368919a39dceSIlya Dryomov return ret; 369019a39dceSIlya Dryomov } 369119a39dceSIlya Dryomov 3692905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36935d13a37bSArne Jansen { 36940b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36965d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36975d13a37bSArne Jansen int ret; 36985d13a37bSArne Jansen 36995d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37005d13a37bSArne Jansen return -EPERM; 37015d13a37bSArne Jansen 3702905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3703905b0ddaSMiao Xie if (ret) 3704905b0ddaSMiao Xie return ret; 37055d13a37bSArne Jansen 37065d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3707905b0ddaSMiao Xie if (IS_ERR(sa)) { 3708905b0ddaSMiao Xie ret = PTR_ERR(sa); 3709905b0ddaSMiao Xie goto drop_write; 3710905b0ddaSMiao Xie } 37115d13a37bSArne Jansen 37120b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 37135d13a37bSArne Jansen 37145d13a37bSArne Jansen switch (sa->cmd) { 37155d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 3716340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 37175d13a37bSArne Jansen break; 37185d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 3719340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 37205d13a37bSArne Jansen break; 37215d13a37bSArne Jansen default: 37225d13a37bSArne Jansen ret = -EINVAL; 37235d13a37bSArne Jansen break; 37245d13a37bSArne Jansen } 37255d13a37bSArne Jansen 37265d13a37bSArne Jansen kfree(sa); 37270b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3728905b0ddaSMiao Xie drop_write: 3729905b0ddaSMiao Xie mnt_drop_write_file(file); 37305d13a37bSArne Jansen return ret; 37315d13a37bSArne Jansen } 37325d13a37bSArne Jansen 3733905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37345d13a37bSArne Jansen { 37350b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37370b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37385d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37395d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37405d13a37bSArne Jansen int ret; 37415d13a37bSArne Jansen int err; 37425d13a37bSArne Jansen 37435d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37445d13a37bSArne Jansen return -EPERM; 37455d13a37bSArne Jansen 3746905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3747905b0ddaSMiao Xie if (ret) 3748905b0ddaSMiao Xie return ret; 37495d13a37bSArne Jansen 37505d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3751905b0ddaSMiao Xie if (IS_ERR(sa)) { 3752905b0ddaSMiao Xie ret = PTR_ERR(sa); 3753905b0ddaSMiao Xie goto drop_write; 3754905b0ddaSMiao Xie } 37555d13a37bSArne Jansen 37565d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37575d13a37bSArne Jansen if (IS_ERR(trans)) { 37585d13a37bSArne Jansen ret = PTR_ERR(trans); 37595d13a37bSArne Jansen goto out; 37605d13a37bSArne Jansen } 37615d13a37bSArne Jansen 37625d13a37bSArne Jansen if (sa->assign) { 37639f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 37645d13a37bSArne Jansen } else { 376539616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 37665d13a37bSArne Jansen } 37675d13a37bSArne Jansen 3768e082f563SQu Wenruo /* update qgroup status and info */ 37692f1a6be1SFilipe Manana mutex_lock(&fs_info->qgroup_ioctl_lock); 3770280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 37712f1a6be1SFilipe Manana mutex_unlock(&fs_info->qgroup_ioctl_lock); 3772e082f563SQu Wenruo if (err < 0) 37730b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 3774ad8403dfSAnand Jain "failed to update qgroup status and info"); 37753a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37765d13a37bSArne Jansen if (err && !ret) 37775d13a37bSArne Jansen ret = err; 37785d13a37bSArne Jansen 37795d13a37bSArne Jansen out: 37805d13a37bSArne Jansen kfree(sa); 3781905b0ddaSMiao Xie drop_write: 3782905b0ddaSMiao Xie mnt_drop_write_file(file); 37835d13a37bSArne Jansen return ret; 37845d13a37bSArne Jansen } 37855d13a37bSArne Jansen 3786905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37875d13a37bSArne Jansen { 37880b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37890b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37905d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37915d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37925d13a37bSArne Jansen int ret; 37935d13a37bSArne Jansen int err; 37945d13a37bSArne Jansen 37955d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37965d13a37bSArne Jansen return -EPERM; 37975d13a37bSArne Jansen 3798905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3799905b0ddaSMiao Xie if (ret) 3800905b0ddaSMiao Xie return ret; 38015d13a37bSArne Jansen 38025d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3803905b0ddaSMiao Xie if (IS_ERR(sa)) { 3804905b0ddaSMiao Xie ret = PTR_ERR(sa); 3805905b0ddaSMiao Xie goto drop_write; 3806905b0ddaSMiao Xie } 38075d13a37bSArne Jansen 3808d86e56cfSMiao Xie if (!sa->qgroupid) { 3809d86e56cfSMiao Xie ret = -EINVAL; 3810d86e56cfSMiao Xie goto out; 3811d86e56cfSMiao Xie } 3812d86e56cfSMiao Xie 38135d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38145d13a37bSArne Jansen if (IS_ERR(trans)) { 38155d13a37bSArne Jansen ret = PTR_ERR(trans); 38165d13a37bSArne Jansen goto out; 38175d13a37bSArne Jansen } 38185d13a37bSArne Jansen 38195d13a37bSArne Jansen if (sa->create) { 382049a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 38215d13a37bSArne Jansen } else { 38223efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 38235d13a37bSArne Jansen } 38245d13a37bSArne Jansen 38253a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 38265d13a37bSArne Jansen if (err && !ret) 38275d13a37bSArne Jansen ret = err; 38285d13a37bSArne Jansen 38295d13a37bSArne Jansen out: 38305d13a37bSArne Jansen kfree(sa); 3831905b0ddaSMiao Xie drop_write: 3832905b0ddaSMiao Xie mnt_drop_write_file(file); 38335d13a37bSArne Jansen return ret; 38345d13a37bSArne Jansen } 38355d13a37bSArne Jansen 3836905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38375d13a37bSArne Jansen { 38380b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38390b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 38405d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38415d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38425d13a37bSArne Jansen int ret; 38435d13a37bSArne Jansen int err; 38445d13a37bSArne Jansen u64 qgroupid; 38455d13a37bSArne Jansen 38465d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38475d13a37bSArne Jansen return -EPERM; 38485d13a37bSArne Jansen 3849905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3850905b0ddaSMiao Xie if (ret) 3851905b0ddaSMiao Xie return ret; 38525d13a37bSArne Jansen 38535d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3854905b0ddaSMiao Xie if (IS_ERR(sa)) { 3855905b0ddaSMiao Xie ret = PTR_ERR(sa); 3856905b0ddaSMiao Xie goto drop_write; 3857905b0ddaSMiao Xie } 38585d13a37bSArne Jansen 38595d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38605d13a37bSArne Jansen if (IS_ERR(trans)) { 38615d13a37bSArne Jansen ret = PTR_ERR(trans); 38625d13a37bSArne Jansen goto out; 38635d13a37bSArne Jansen } 38645d13a37bSArne Jansen 38655d13a37bSArne Jansen qgroupid = sa->qgroupid; 38665d13a37bSArne Jansen if (!qgroupid) { 38675d13a37bSArne Jansen /* take the current subvol as qgroup */ 38685d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38695d13a37bSArne Jansen } 38705d13a37bSArne Jansen 3871f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 38725d13a37bSArne Jansen 38733a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 38745d13a37bSArne Jansen if (err && !ret) 38755d13a37bSArne Jansen ret = err; 38765d13a37bSArne Jansen 38775d13a37bSArne Jansen out: 38785d13a37bSArne Jansen kfree(sa); 3879905b0ddaSMiao Xie drop_write: 3880905b0ddaSMiao Xie mnt_drop_write_file(file); 38815d13a37bSArne Jansen return ret; 38825d13a37bSArne Jansen } 38835d13a37bSArne Jansen 38842f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38852f232036SJan Schmidt { 38860b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 38882f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38892f232036SJan Schmidt int ret; 38902f232036SJan Schmidt 38912f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38922f232036SJan Schmidt return -EPERM; 38932f232036SJan Schmidt 38942f232036SJan Schmidt ret = mnt_want_write_file(file); 38952f232036SJan Schmidt if (ret) 38962f232036SJan Schmidt return ret; 38972f232036SJan Schmidt 38982f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38992f232036SJan Schmidt if (IS_ERR(qsa)) { 39002f232036SJan Schmidt ret = PTR_ERR(qsa); 39012f232036SJan Schmidt goto drop_write; 39022f232036SJan Schmidt } 39032f232036SJan Schmidt 39042f232036SJan Schmidt if (qsa->flags) { 39052f232036SJan Schmidt ret = -EINVAL; 39062f232036SJan Schmidt goto out; 39072f232036SJan Schmidt } 39082f232036SJan Schmidt 39090b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 39102f232036SJan Schmidt 39112f232036SJan Schmidt out: 39122f232036SJan Schmidt kfree(qsa); 39132f232036SJan Schmidt drop_write: 39142f232036SJan Schmidt mnt_drop_write_file(file); 39152f232036SJan Schmidt return ret; 39162f232036SJan Schmidt } 39172f232036SJan Schmidt 3918b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 3919b929c1d8SMarcos Paulo de Souza void __user *arg) 39202f232036SJan Schmidt { 39210afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 39222f232036SJan Schmidt 39232f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 39242f232036SJan Schmidt return -EPERM; 39252f232036SJan Schmidt 39260b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 39270afb603aSGoldwyn Rodrigues qsa.flags = 1; 39280afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 39292f232036SJan Schmidt } 39302f232036SJan Schmidt 39310afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 3932991a3daeSAnand Jain return -EFAULT; 39332f232036SJan Schmidt 3934991a3daeSAnand Jain return 0; 39352f232036SJan Schmidt } 39362f232036SJan Schmidt 3937b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 3938b929c1d8SMarcos Paulo de Souza void __user *arg) 393957254b6eSJan Schmidt { 394057254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 394157254b6eSJan Schmidt return -EPERM; 394257254b6eSJan Schmidt 39430b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 394457254b6eSJan Schmidt } 394557254b6eSJan Schmidt 3946abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 394701beba79SChristian Brauner struct mnt_idmap *idmap, 3948abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 39498ea05e3aSAlexander Block { 3950496ad9aaSAl Viro struct inode *inode = file_inode(file); 39510b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 39528ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39538ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39548ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 395595582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 39568ea05e3aSAlexander Block int ret = 0; 3957dd5f9615SStefan Behrens int received_uuid_changed; 39588ea05e3aSAlexander Block 395901beba79SChristian Brauner if (!inode_owner_or_capable(idmap, inode)) 3960bd60ea0fSDavid Sterba return -EPERM; 3961bd60ea0fSDavid Sterba 39628ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39638ea05e3aSAlexander Block if (ret < 0) 39648ea05e3aSAlexander Block return ret; 39658ea05e3aSAlexander Block 39660b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 39678ea05e3aSAlexander Block 39684a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 39698ea05e3aSAlexander Block ret = -EINVAL; 39708ea05e3aSAlexander Block goto out; 39718ea05e3aSAlexander Block } 39728ea05e3aSAlexander Block 39738ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39748ea05e3aSAlexander Block ret = -EROFS; 39758ea05e3aSAlexander Block goto out; 39768ea05e3aSAlexander Block } 39778ea05e3aSAlexander Block 3978dd5f9615SStefan Behrens /* 3979dd5f9615SStefan Behrens * 1 - root item 3980dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 3981dd5f9615SStefan Behrens */ 3982dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 39838ea05e3aSAlexander Block if (IS_ERR(trans)) { 39848ea05e3aSAlexander Block ret = PTR_ERR(trans); 39858ea05e3aSAlexander Block trans = NULL; 39868ea05e3aSAlexander Block goto out; 39878ea05e3aSAlexander Block } 39888ea05e3aSAlexander Block 39898ea05e3aSAlexander Block sa->rtransid = trans->transid; 39908ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39918ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39928ea05e3aSAlexander Block 3993dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 3994dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 3995dd5f9615SStefan Behrens if (received_uuid_changed && 3996d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 3997d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 3998dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3999dd5f9615SStefan Behrens root->root_key.objectid); 4000d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4001d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4002d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4003d87ff758SNikolay Borisov goto out; 4004d87ff758SNikolay Borisov } 4005d87ff758SNikolay Borisov } 40068ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 40078ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 40088ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 40093cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 40103cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 40113cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 40123cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 40138ea05e3aSAlexander Block 40140b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 40158ea05e3aSAlexander Block &root->root_key, &root->root_item); 40168ea05e3aSAlexander Block if (ret < 0) { 40173a45bb20SJeff Mahoney btrfs_end_transaction(trans); 40188ea05e3aSAlexander Block goto out; 4019dd5f9615SStefan Behrens } 4020dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4021cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4022dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4023dd5f9615SStefan Behrens root->root_key.objectid); 4024dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 402566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4026efd38150SNikolay Borisov btrfs_end_transaction(trans); 4027dd5f9615SStefan Behrens goto out; 4028dd5f9615SStefan Behrens } 4029dd5f9615SStefan Behrens } 40303a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4031abccd00fSHugo Mills out: 40320b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4033abccd00fSHugo Mills mnt_drop_write_file(file); 4034abccd00fSHugo Mills return ret; 4035abccd00fSHugo Mills } 4036abccd00fSHugo Mills 4037abccd00fSHugo Mills #ifdef CONFIG_64BIT 4038abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4039abccd00fSHugo Mills void __user *arg) 4040abccd00fSHugo Mills { 4041abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4042abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4043abccd00fSHugo Mills int ret = 0; 4044abccd00fSHugo Mills 4045abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 40467b9ea627SShailendra Verma if (IS_ERR(args32)) 40477b9ea627SShailendra Verma return PTR_ERR(args32); 4048abccd00fSHugo Mills 40498d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 405084dbeb87SDan Carpenter if (!args64) { 405184dbeb87SDan Carpenter ret = -ENOMEM; 4052abccd00fSHugo Mills goto out; 4053abccd00fSHugo Mills } 4054abccd00fSHugo Mills 4055abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4056abccd00fSHugo Mills args64->stransid = args32->stransid; 4057abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4058abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4059abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4060abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4061abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4062abccd00fSHugo Mills args64->flags = args32->flags; 4063abccd00fSHugo Mills 406401beba79SChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), args64); 4065abccd00fSHugo Mills if (ret) 4066abccd00fSHugo Mills goto out; 4067abccd00fSHugo Mills 4068abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4069abccd00fSHugo Mills args32->stransid = args64->stransid; 4070abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4071abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4072abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4073abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4074abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4075abccd00fSHugo Mills args32->flags = args64->flags; 4076abccd00fSHugo Mills 4077abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4078abccd00fSHugo Mills if (ret) 4079abccd00fSHugo Mills ret = -EFAULT; 4080abccd00fSHugo Mills 4081abccd00fSHugo Mills out: 4082abccd00fSHugo Mills kfree(args32); 4083abccd00fSHugo Mills kfree(args64); 4084abccd00fSHugo Mills return ret; 4085abccd00fSHugo Mills } 4086abccd00fSHugo Mills #endif 4087abccd00fSHugo Mills 4088abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4089abccd00fSHugo Mills void __user *arg) 4090abccd00fSHugo Mills { 4091abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4092abccd00fSHugo Mills int ret = 0; 4093abccd00fSHugo Mills 4094abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 40957b9ea627SShailendra Verma if (IS_ERR(sa)) 40967b9ea627SShailendra Verma return PTR_ERR(sa); 4097abccd00fSHugo Mills 409801beba79SChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), sa); 4099abccd00fSHugo Mills 4100abccd00fSHugo Mills if (ret) 4101abccd00fSHugo Mills goto out; 4102abccd00fSHugo Mills 41038ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 41048ea05e3aSAlexander Block if (ret) 41058ea05e3aSAlexander Block ret = -EFAULT; 41068ea05e3aSAlexander Block 41078ea05e3aSAlexander Block out: 41088ea05e3aSAlexander Block kfree(sa); 41098ea05e3aSAlexander Block return ret; 41108ea05e3aSAlexander Block } 41118ea05e3aSAlexander Block 4112b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4113b929c1d8SMarcos Paulo de Souza void __user *arg) 4114867ab667Sjeff.liu { 4115a1b83ac5SAnand Jain size_t len; 4116867ab667Sjeff.liu int ret; 4117a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4118a1b83ac5SAnand Jain 41190b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 41200b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 41210b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4122a1b83ac5SAnand Jain 4123a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4124867ab667Sjeff.liu 4125867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 41260b246afaSJeff Mahoney btrfs_warn(fs_info, 41270b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 41280b246afaSJeff Mahoney --len); 4129867ab667Sjeff.liu } 4130867ab667Sjeff.liu 4131867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4132867ab667Sjeff.liu 4133867ab667Sjeff.liu return ret ? -EFAULT : 0; 4134867ab667Sjeff.liu } 4135867ab667Sjeff.liu 4136a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4137a8bfd4abSjeff.liu { 41380b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41390b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41400b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41410b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4142a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4143a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4144a8bfd4abSjeff.liu int ret; 4145a8bfd4abSjeff.liu 4146a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4147a8bfd4abSjeff.liu return -EPERM; 4148a8bfd4abSjeff.liu 4149a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4150a8bfd4abSjeff.liu return -EFAULT; 4151a8bfd4abSjeff.liu 4152a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 41530b246afaSJeff Mahoney btrfs_err(fs_info, 41545d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4155a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4156a8bfd4abSjeff.liu return -EINVAL; 4157a8bfd4abSjeff.liu } 4158a8bfd4abSjeff.liu 4159a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4160a8bfd4abSjeff.liu if (ret) 4161a8bfd4abSjeff.liu return ret; 4162a8bfd4abSjeff.liu 4163a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4164a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4165a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4166a8bfd4abSjeff.liu goto out_unlock; 4167a8bfd4abSjeff.liu } 4168a8bfd4abSjeff.liu 41690b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4170a8bfd4abSjeff.liu strcpy(super_block->label, label); 41710b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 41723a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4173a8bfd4abSjeff.liu 4174a8bfd4abSjeff.liu out_unlock: 4175a8bfd4abSjeff.liu mnt_drop_write_file(file); 4176a8bfd4abSjeff.liu return ret; 4177a8bfd4abSjeff.liu } 4178a8bfd4abSjeff.liu 41792eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 41802eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 41812eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 41822eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 41832eaa055fSJeff Mahoney 4184d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 41852eaa055fSJeff Mahoney { 41864d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 41872eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 41882eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 41892eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 41902eaa055fSJeff Mahoney }; 41912eaa055fSJeff Mahoney 41922eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41932eaa055fSJeff Mahoney return -EFAULT; 41942eaa055fSJeff Mahoney 41952eaa055fSJeff Mahoney return 0; 41962eaa055fSJeff Mahoney } 41972eaa055fSJeff Mahoney 4198b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4199b929c1d8SMarcos Paulo de Souza void __user *arg) 42002eaa055fSJeff Mahoney { 42010b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 42022eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 42032eaa055fSJeff Mahoney 42042eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 42052eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 42062eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 42072eaa055fSJeff Mahoney 42082eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 42092eaa055fSJeff Mahoney return -EFAULT; 42102eaa055fSJeff Mahoney 42112eaa055fSJeff Mahoney return 0; 42122eaa055fSJeff Mahoney } 42132eaa055fSJeff Mahoney 42142ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 42153b02a68aSJeff Mahoney enum btrfs_feature_set set, 42162eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 42172eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 42182eaa055fSJeff Mahoney { 4219f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 42203b02a68aSJeff Mahoney char *names; 42212eaa055fSJeff Mahoney u64 disallowed, unsupported; 42222eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 42232eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 42242eaa055fSJeff Mahoney 42252eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 42262eaa055fSJeff Mahoney if (unsupported) { 42273b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 42283b02a68aSJeff Mahoney if (names) { 42290b246afaSJeff Mahoney btrfs_warn(fs_info, 42303b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 42313b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42323b02a68aSJeff Mahoney kfree(names); 42333b02a68aSJeff Mahoney } else 42340b246afaSJeff Mahoney btrfs_warn(fs_info, 42352eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 42362eaa055fSJeff Mahoney type, unsupported); 42372eaa055fSJeff Mahoney return -EOPNOTSUPP; 42382eaa055fSJeff Mahoney } 42392eaa055fSJeff Mahoney 42402eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 42412eaa055fSJeff Mahoney if (disallowed) { 42423b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42433b02a68aSJeff Mahoney if (names) { 42440b246afaSJeff Mahoney btrfs_warn(fs_info, 42453b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 42463b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42473b02a68aSJeff Mahoney kfree(names); 42483b02a68aSJeff Mahoney } else 42490b246afaSJeff Mahoney btrfs_warn(fs_info, 42502eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 42512eaa055fSJeff Mahoney type, disallowed); 42522eaa055fSJeff Mahoney return -EPERM; 42532eaa055fSJeff Mahoney } 42542eaa055fSJeff Mahoney 42552eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 42562eaa055fSJeff Mahoney if (disallowed) { 42573b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42583b02a68aSJeff Mahoney if (names) { 42590b246afaSJeff Mahoney btrfs_warn(fs_info, 42603b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 42613b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42623b02a68aSJeff Mahoney kfree(names); 42633b02a68aSJeff Mahoney } else 42640b246afaSJeff Mahoney btrfs_warn(fs_info, 42652eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 42662eaa055fSJeff Mahoney type, disallowed); 42672eaa055fSJeff Mahoney return -EPERM; 42682eaa055fSJeff Mahoney } 42692eaa055fSJeff Mahoney 42702eaa055fSJeff Mahoney return 0; 42712eaa055fSJeff Mahoney } 42722eaa055fSJeff Mahoney 42732ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 42742ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 42752eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 42762eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 42772eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 42782eaa055fSJeff Mahoney 42792eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 42802eaa055fSJeff Mahoney { 42810b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42820b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42830b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42840b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 42852eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 42862eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 42872eaa055fSJeff Mahoney u64 newflags; 42882eaa055fSJeff Mahoney int ret; 42892eaa055fSJeff Mahoney 42902eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 42912eaa055fSJeff Mahoney return -EPERM; 42922eaa055fSJeff Mahoney 42932eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 42942eaa055fSJeff Mahoney return -EFAULT; 42952eaa055fSJeff Mahoney 42962eaa055fSJeff Mahoney /* Nothing to do */ 42972eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 42982eaa055fSJeff Mahoney !flags[0].incompat_flags) 42992eaa055fSJeff Mahoney return 0; 43002eaa055fSJeff Mahoney 43012ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 43022eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 43032eaa055fSJeff Mahoney if (ret) 43042eaa055fSJeff Mahoney return ret; 43052eaa055fSJeff Mahoney 43062ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 43072eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 43082eaa055fSJeff Mahoney if (ret) 43092eaa055fSJeff Mahoney return ret; 43102eaa055fSJeff Mahoney 43112ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 43122eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 43132eaa055fSJeff Mahoney if (ret) 43142eaa055fSJeff Mahoney return ret; 43152eaa055fSJeff Mahoney 43167ab19625SDavid Sterba ret = mnt_want_write_file(file); 43177ab19625SDavid Sterba if (ret) 43187ab19625SDavid Sterba return ret; 43197ab19625SDavid Sterba 43208051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 43217ab19625SDavid Sterba if (IS_ERR(trans)) { 43227ab19625SDavid Sterba ret = PTR_ERR(trans); 43237ab19625SDavid Sterba goto out_drop_write; 43247ab19625SDavid Sterba } 43252eaa055fSJeff Mahoney 43260b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 43272eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 43282eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 43292eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 43302eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 43312eaa055fSJeff Mahoney 43322eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 43332eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 43342eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 43352eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 43362eaa055fSJeff Mahoney 43372eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 43382eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 43392eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 43402eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 43410b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 43422eaa055fSJeff Mahoney 43433a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 43447ab19625SDavid Sterba out_drop_write: 43457ab19625SDavid Sterba mnt_drop_write_file(file); 43467ab19625SDavid Sterba 43477ab19625SDavid Sterba return ret; 43482eaa055fSJeff Mahoney } 43492eaa055fSJeff Mahoney 43509ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 43512351f431SJosef Bacik { 43522351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 43532351f431SJosef Bacik int ret; 43542351f431SJosef Bacik 43552351f431SJosef Bacik if (compat) { 43562351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43579147b9deSJosef Bacik struct btrfs_ioctl_send_args_32 args32 = { 0 }; 43582351f431SJosef Bacik 43592351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 43602351f431SJosef Bacik if (ret) 43612351f431SJosef Bacik return -EFAULT; 43622351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 43632351f431SJosef Bacik if (!arg) 43642351f431SJosef Bacik return -ENOMEM; 43652351f431SJosef Bacik arg->send_fd = args32.send_fd; 43662351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 43672351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 43682351f431SJosef Bacik arg->parent_root = args32.parent_root; 43692351f431SJosef Bacik arg->flags = args32.flags; 43704a1a4bf2SDavid Sterba arg->version = args32.version; 43712351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 43722351f431SJosef Bacik sizeof(args32.reserved)); 43732351f431SJosef Bacik #else 43742351f431SJosef Bacik return -ENOTTY; 43752351f431SJosef Bacik #endif 43762351f431SJosef Bacik } else { 43772351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 43782351f431SJosef Bacik if (IS_ERR(arg)) 43792351f431SJosef Bacik return PTR_ERR(arg); 43802351f431SJosef Bacik } 43819ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 43822351f431SJosef Bacik kfree(arg); 43832351f431SJosef Bacik return ret; 43842351f431SJosef Bacik } 43852351f431SJosef Bacik 43861881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 43871881fba8SOmar Sandoval bool compat) 43881881fba8SOmar Sandoval { 43891881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 43901881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 43911881fba8SOmar Sandoval flags); 43921881fba8SOmar Sandoval size_t copy_end; 43931881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 43941881fba8SOmar Sandoval struct iovec *iov = iovstack; 43951881fba8SOmar Sandoval struct iov_iter iter; 43961881fba8SOmar Sandoval loff_t pos; 43971881fba8SOmar Sandoval struct kiocb kiocb; 43981881fba8SOmar Sandoval ssize_t ret; 43991881fba8SOmar Sandoval 44001881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 44011881fba8SOmar Sandoval ret = -EPERM; 44021881fba8SOmar Sandoval goto out_acct; 44031881fba8SOmar Sandoval } 44041881fba8SOmar Sandoval 44051881fba8SOmar Sandoval if (compat) { 44061881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 44071881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 44081881fba8SOmar Sandoval 44091881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 44101881fba8SOmar Sandoval flags); 44111881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 44121881fba8SOmar Sandoval ret = -EFAULT; 44131881fba8SOmar Sandoval goto out_acct; 44141881fba8SOmar Sandoval } 44151881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 44161881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 44171881fba8SOmar Sandoval args.offset = args32.offset; 44181881fba8SOmar Sandoval args.flags = args32.flags; 44191881fba8SOmar Sandoval #else 44201881fba8SOmar Sandoval return -ENOTTY; 44211881fba8SOmar Sandoval #endif 44221881fba8SOmar Sandoval } else { 44231881fba8SOmar Sandoval copy_end = copy_end_kernel; 44241881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 44251881fba8SOmar Sandoval ret = -EFAULT; 44261881fba8SOmar Sandoval goto out_acct; 44271881fba8SOmar Sandoval } 44281881fba8SOmar Sandoval } 44291881fba8SOmar Sandoval if (args.flags != 0) { 44301881fba8SOmar Sandoval ret = -EINVAL; 44311881fba8SOmar Sandoval goto out_acct; 44321881fba8SOmar Sandoval } 44331881fba8SOmar Sandoval 4434de4eda9dSAl Viro ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 44351881fba8SOmar Sandoval &iov, &iter); 44361881fba8SOmar Sandoval if (ret < 0) 44371881fba8SOmar Sandoval goto out_acct; 44381881fba8SOmar Sandoval 44391881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 44401881fba8SOmar Sandoval ret = 0; 44411881fba8SOmar Sandoval goto out_iov; 44421881fba8SOmar Sandoval } 44431881fba8SOmar Sandoval pos = args.offset; 44441881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 44451881fba8SOmar Sandoval if (ret < 0) 44461881fba8SOmar Sandoval goto out_iov; 44471881fba8SOmar Sandoval 44481881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 44491881fba8SOmar Sandoval kiocb.ki_pos = pos; 44501881fba8SOmar Sandoval 44511881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 44521881fba8SOmar Sandoval if (ret >= 0) { 44531881fba8SOmar Sandoval fsnotify_access(file); 44541881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 44551881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 44561881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 44571881fba8SOmar Sandoval ret = -EFAULT; 44581881fba8SOmar Sandoval } 44591881fba8SOmar Sandoval 44601881fba8SOmar Sandoval out_iov: 44611881fba8SOmar Sandoval kfree(iov); 44621881fba8SOmar Sandoval out_acct: 44631881fba8SOmar Sandoval if (ret > 0) 44641881fba8SOmar Sandoval add_rchar(current, ret); 44651881fba8SOmar Sandoval inc_syscr(current); 44661881fba8SOmar Sandoval return ret; 44671881fba8SOmar Sandoval } 44681881fba8SOmar Sandoval 44697c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 44707c0c7269SOmar Sandoval { 44717c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 44727c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 44737c0c7269SOmar Sandoval struct iovec *iov = iovstack; 44747c0c7269SOmar Sandoval struct iov_iter iter; 44757c0c7269SOmar Sandoval loff_t pos; 44767c0c7269SOmar Sandoval struct kiocb kiocb; 44777c0c7269SOmar Sandoval ssize_t ret; 44787c0c7269SOmar Sandoval 44797c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 44807c0c7269SOmar Sandoval ret = -EPERM; 44817c0c7269SOmar Sandoval goto out_acct; 44827c0c7269SOmar Sandoval } 44837c0c7269SOmar Sandoval 44847c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 44857c0c7269SOmar Sandoval ret = -EBADF; 44867c0c7269SOmar Sandoval goto out_acct; 44877c0c7269SOmar Sandoval } 44887c0c7269SOmar Sandoval 44897c0c7269SOmar Sandoval if (compat) { 44907c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 44917c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 44927c0c7269SOmar Sandoval 44937c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 44947c0c7269SOmar Sandoval ret = -EFAULT; 44957c0c7269SOmar Sandoval goto out_acct; 44967c0c7269SOmar Sandoval } 44977c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 44987c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 44997c0c7269SOmar Sandoval args.offset = args32.offset; 45007c0c7269SOmar Sandoval args.flags = args32.flags; 45017c0c7269SOmar Sandoval args.len = args32.len; 45027c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 45037c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 45047c0c7269SOmar Sandoval args.compression = args32.compression; 45057c0c7269SOmar Sandoval args.encryption = args32.encryption; 45067c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 45077c0c7269SOmar Sandoval #else 45087c0c7269SOmar Sandoval return -ENOTTY; 45097c0c7269SOmar Sandoval #endif 45107c0c7269SOmar Sandoval } else { 45117c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 45127c0c7269SOmar Sandoval ret = -EFAULT; 45137c0c7269SOmar Sandoval goto out_acct; 45147c0c7269SOmar Sandoval } 45157c0c7269SOmar Sandoval } 45167c0c7269SOmar Sandoval 45177c0c7269SOmar Sandoval ret = -EINVAL; 45187c0c7269SOmar Sandoval if (args.flags != 0) 45197c0c7269SOmar Sandoval goto out_acct; 45207c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 45217c0c7269SOmar Sandoval goto out_acct; 45227c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 45237c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 45247c0c7269SOmar Sandoval goto out_acct; 45257c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 45267c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 45277c0c7269SOmar Sandoval goto out_acct; 45287c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 45297c0c7269SOmar Sandoval goto out_acct; 45307c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 45317c0c7269SOmar Sandoval goto out_acct; 45327c0c7269SOmar Sandoval 4533de4eda9dSAl Viro ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 45347c0c7269SOmar Sandoval &iov, &iter); 45357c0c7269SOmar Sandoval if (ret < 0) 45367c0c7269SOmar Sandoval goto out_acct; 45377c0c7269SOmar Sandoval 45387c0c7269SOmar Sandoval file_start_write(file); 45397c0c7269SOmar Sandoval 45407c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 45417c0c7269SOmar Sandoval ret = 0; 45427c0c7269SOmar Sandoval goto out_end_write; 45437c0c7269SOmar Sandoval } 45447c0c7269SOmar Sandoval pos = args.offset; 45457c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 45467c0c7269SOmar Sandoval if (ret < 0) 45477c0c7269SOmar Sandoval goto out_end_write; 45487c0c7269SOmar Sandoval 45497c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 45507c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 45517c0c7269SOmar Sandoval if (ret) 45527c0c7269SOmar Sandoval goto out_end_write; 45537c0c7269SOmar Sandoval kiocb.ki_pos = pos; 45547c0c7269SOmar Sandoval 45557c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 45567c0c7269SOmar Sandoval if (ret > 0) 45577c0c7269SOmar Sandoval fsnotify_modify(file); 45587c0c7269SOmar Sandoval 45597c0c7269SOmar Sandoval out_end_write: 45607c0c7269SOmar Sandoval file_end_write(file); 45617c0c7269SOmar Sandoval kfree(iov); 45627c0c7269SOmar Sandoval out_acct: 45637c0c7269SOmar Sandoval if (ret > 0) 45647c0c7269SOmar Sandoval add_wchar(current, ret); 45657c0c7269SOmar Sandoval inc_syscw(current); 45667c0c7269SOmar Sandoval return ret; 45677c0c7269SOmar Sandoval } 45687c0c7269SOmar Sandoval 4569f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4570f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4571f46b5a66SChristoph Hellwig { 45720b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45740b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45754bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4576f46b5a66SChristoph Hellwig 4577f46b5a66SChristoph Hellwig switch (cmd) { 45786cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 4579dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 458040cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4581b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 458240cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 458340cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4584f7039b1dSLi Dongyang case FITRIM: 4585b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4586f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4587fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4588fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4589fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45903de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4591fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45926f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45936f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 459476dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4595949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4596949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4597949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 45980caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45999ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 46000caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 46010caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 46026ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 46036ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4604f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 46051e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 46061e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 46071e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4608f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4609198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4610f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 46112ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4612f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4613da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 46146b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 46156b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4616475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 46172ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4618475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 46192ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4620ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 46219ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 4622cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 46239ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 4624ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4625dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 4626d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4627d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4628d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4629d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4630d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4631d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 46321406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 46332ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 46349b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 46359b199859SFilipe David Borba Manana int ret; 46369b199859SFilipe David Borba Manana 46379db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 46389b199859SFilipe David Borba Manana if (ret) 46399b199859SFilipe David Borba Manana return ret; 46400b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 46412fad4e83SDavid Sterba /* 46422fad4e83SDavid Sterba * The transaction thread may want to do more work, 464301327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 46442fad4e83SDavid Sterba * processing uncleaned subvols. 46452fad4e83SDavid Sterba */ 46460b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 46479b199859SFilipe David Borba Manana return ret; 46489b199859SFilipe David Borba Manana } 464946204592SSage Weil case BTRFS_IOC_START_SYNC: 46509a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 465146204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 46522ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4653475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4654b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4655475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 46562ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4657475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 46582ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4659c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 46609ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4661837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 46622ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 466319a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 46642ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 46658ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 46668ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4667abccd00fSHugo Mills #ifdef CONFIG_64BIT 4668abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4669abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4670abccd00fSHugo Mills #endif 467131db9f7cSAlexander Block case BTRFS_IOC_SEND: 46729ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 46732351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46742351f431SJosef Bacik case BTRFS_IOC_SEND_32: 46759ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 46762351f431SJosef Bacik #endif 4677c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 46782ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 46795d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4680905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 46815d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4682905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 46835d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4684905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 46855d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4686905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 46872f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 46882f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 46892f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4690b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 469157254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4692b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 46933f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 46942ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 46952eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4696d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 46972eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4698b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 46992eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 47002eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4701b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 47029ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 470342e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 4704dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 470523d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 470623d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 470714605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 470814605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 470914605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 471014605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 47111881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 47121881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 47137c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 47147c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 47151881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 47161881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 47171881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 47187c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 47197c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 47201881fba8SOmar Sandoval #endif 4721f46b5a66SChristoph Hellwig } 4722f46b5a66SChristoph Hellwig 4723f46b5a66SChristoph Hellwig return -ENOTTY; 4724f46b5a66SChristoph Hellwig } 47254c63c245SLuke Dashjr 47264c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 47274c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 47284c63c245SLuke Dashjr { 47292a362249SJeff Mahoney /* 47302a362249SJeff Mahoney * These all access 32-bit values anyway so no further 47312a362249SJeff Mahoney * handling is necessary. 47322a362249SJeff Mahoney */ 47334c63c245SLuke Dashjr switch (cmd) { 47344c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 47354c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 47364c63c245SLuke Dashjr break; 47374c63c245SLuke Dashjr } 47384c63c245SLuke Dashjr 47394c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 47404c63c245SLuke Dashjr } 47414c63c245SLuke Dashjr #endif 4742