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); 387c2050a45SDeepa Dinamani inode->i_ctime = current_time(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 || 457efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 458efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 459efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 460efc0e69cSNikolay Borisov break; 461efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 462efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 463efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 464efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 465efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 466efc0e69cSNikolay Borisov break; 467efc0e69cSNikolay Borisov default: 468efc0e69cSNikolay Borisov btrfs_warn(fs_info, 469efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 470efc0e69cSNikolay Borisov } 471efc0e69cSNikolay Borisov } 472efc0e69cSNikolay Borisov 473dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4746cbff00fSChristoph Hellwig { 4756cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4766cbff00fSChristoph Hellwig } 477f46b5a66SChristoph Hellwig 478b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 479b929c1d8SMarcos Paulo de Souza void __user *arg) 480f7039b1dSLi Dongyang { 481f7039b1dSLi Dongyang struct btrfs_device *device; 482f7039b1dSLi Dongyang struct fstrim_range range; 483f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 484f7039b1dSLi Dongyang u64 num_devices = 0; 485f7039b1dSLi Dongyang int ret; 486f7039b1dSLi Dongyang 487f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 488f7039b1dSLi Dongyang return -EPERM; 489f7039b1dSLi Dongyang 490f35f06c3SFilipe Manana /* 4911cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4921cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4931cb3dc3fSNaohiro Aota * filesystem for now. 4941cb3dc3fSNaohiro Aota */ 4951cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4961cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4971cb3dc3fSNaohiro Aota 4981cb3dc3fSNaohiro Aota /* 499f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 500f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 501f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 502f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 503f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 504f35f06c3SFilipe Manana */ 505f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 506f35f06c3SFilipe Manana return -EROFS; 507f35f06c3SFilipe Manana 5081f78160cSXiao Guangrong rcu_read_lock(); 5091f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5101f78160cSXiao Guangrong dev_list) { 5117b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 512f7039b1dSLi Dongyang continue; 513f7039b1dSLi Dongyang num_devices++; 5147b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 515f7039b1dSLi Dongyang minlen); 516f7039b1dSLi Dongyang } 5171f78160cSXiao Guangrong rcu_read_unlock(); 518f4c697e6SLukas Czerner 519f7039b1dSLi Dongyang if (!num_devices) 520f7039b1dSLi Dongyang return -EOPNOTSUPP; 521f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 522f7039b1dSLi Dongyang return -EFAULT; 5236ba9fc8eSQu Wenruo 5246ba9fc8eSQu Wenruo /* 5256ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5266ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5276ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5286ba9fc8eSQu Wenruo */ 5296ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 530f4c697e6SLukas Czerner return -EINVAL; 531f7039b1dSLi Dongyang 532f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5332ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 534f7039b1dSLi Dongyang if (ret < 0) 535f7039b1dSLi Dongyang return ret; 536f7039b1dSLi Dongyang 537f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 538f7039b1dSLi Dongyang return -EFAULT; 539f7039b1dSLi Dongyang 540f7039b1dSLi Dongyang return 0; 541f7039b1dSLi Dongyang } 542f7039b1dSLi Dongyang 543e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 544dd5f9615SStefan Behrens { 54546e0f66aSChris Mason int i; 54646e0f66aSChris Mason 54746e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54846e0f66aSChris Mason if (uuid[i]) 54946e0f66aSChris Mason return 0; 55046e0f66aSChris Mason } 55146e0f66aSChris Mason return 1; 552dd5f9615SStefan Behrens } 553dd5f9615SStefan Behrens 5543538d68dSOmar Sandoval /* 5553538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5563538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5573538d68dSOmar Sandoval */ 5583538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5593538d68dSOmar Sandoval { 5603538d68dSOmar Sandoval /* 5613538d68dSOmar Sandoval * 1 to add root block 5623538d68dSOmar Sandoval * 1 to add root item 5633538d68dSOmar Sandoval * 1 to add root ref 5643538d68dSOmar Sandoval * 1 to add root backref 5653538d68dSOmar Sandoval * 1 to add UUID item 5663538d68dSOmar Sandoval * 1 to add qgroup info 5673538d68dSOmar Sandoval * 1 to add qgroup limit 5683538d68dSOmar Sandoval * 5693538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5703538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5713538d68dSOmar Sandoval */ 5723538d68dSOmar Sandoval unsigned int num_items = 7; 5733538d68dSOmar Sandoval 5743538d68dSOmar Sandoval if (inherit) { 5753538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5763538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5773538d68dSOmar Sandoval } 5783538d68dSOmar Sandoval return num_items; 5793538d68dSOmar Sandoval } 5803538d68dSOmar Sandoval 5814d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5824d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5838696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 584f46b5a66SChristoph Hellwig { 5850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 586f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 587f46b5a66SChristoph Hellwig struct btrfs_key key; 58849a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 589f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 590f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 591d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 59276dda93cSYan, Zheng struct btrfs_root *new_root; 593d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 59495582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5953538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5963538d68dSOmar Sandoval .dir = dir, 5973538d68dSOmar Sandoval .dentry = dentry, 5983538d68dSOmar Sandoval .subvol = true, 5993538d68dSOmar Sandoval }; 6003538d68dSOmar Sandoval unsigned int trans_num_items; 601f46b5a66SChristoph Hellwig int ret; 6022256e901SOmar Sandoval dev_t anon_dev; 603f46b5a66SChristoph Hellwig u64 objectid; 604f46b5a66SChristoph Hellwig 60549a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 60649a3c4d9SDavid Sterba if (!root_item) 60749a3c4d9SDavid Sterba return -ENOMEM; 60849a3c4d9SDavid Sterba 609543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6102fbe8c8aSAl Viro if (ret) 6112256e901SOmar Sandoval goto out_root_item; 6122dfb1e43SQu Wenruo 613e09fe2d2SQu Wenruo /* 614e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 61501327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 616e09fe2d2SQu Wenruo */ 61749a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 61849a3c4d9SDavid Sterba ret = -ENOSPC; 6192256e901SOmar Sandoval goto out_root_item; 62049a3c4d9SDavid Sterba } 621e09fe2d2SQu Wenruo 6222256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6232256e901SOmar Sandoval if (ret < 0) 6242256e901SOmar Sandoval goto out_root_item; 6252256e901SOmar Sandoval 6263538d68dSOmar Sandoval new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); 6273538d68dSOmar Sandoval if (!new_inode_args.inode) { 628a1fd0c35SOmar Sandoval ret = -ENOMEM; 629a1fd0c35SOmar Sandoval goto out_anon_dev; 630a1fd0c35SOmar Sandoval } 6313538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 632d5c12070SMiao Xie if (ret) 633a1fd0c35SOmar Sandoval goto out_inode; 6343538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6353538d68dSOmar Sandoval 6363538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6373538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6383538d68dSOmar Sandoval trans_num_items, false); 6393538d68dSOmar Sandoval if (ret) 6403538d68dSOmar Sandoval goto out_new_inode_args; 641f46b5a66SChristoph Hellwig 642d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 643d5c12070SMiao Xie if (IS_ERR(trans)) { 644d5c12070SMiao Xie ret = PTR_ERR(trans); 645e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6463538d68dSOmar Sandoval goto out_new_inode_args; 647d5c12070SMiao Xie } 648d5c12070SMiao Xie trans->block_rsv = &block_rsv; 649d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 650f46b5a66SChristoph Hellwig 651a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6526f72c7e2SArne Jansen if (ret) 6532256e901SOmar Sandoval goto out; 6546f72c7e2SArne Jansen 6559631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6569631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6578e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6588e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6592256e901SOmar Sandoval goto out; 6608e8a1e31SJosef Bacik } 661f46b5a66SChristoph Hellwig 662f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 663f46b5a66SChristoph Hellwig 66449a3c4d9SDavid Sterba inode_item = &root_item->inode; 6653cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6663cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6673cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 668da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6690b246afaSJeff Mahoney fs_info->nodesize); 6703cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 671f46b5a66SChristoph Hellwig 67249a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 67349a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6743cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 67508fe4db1SLi Zefan 67649a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 67749a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 67849a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 67949a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 68049a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68149a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 682f46b5a66SChristoph Hellwig 68349a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 68449a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 685807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 68649a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 68749a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 68849a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 68949a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 69049a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 691f46b5a66SChristoph Hellwig 692925baeddSChris Mason btrfs_tree_unlock(leaf); 693f46b5a66SChristoph Hellwig 69469948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 695f46b5a66SChristoph Hellwig 696f46b5a66SChristoph Hellwig key.objectid = objectid; 6975d4f98a2SYan Zheng key.offset = 0; 698962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6990b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70049a3c4d9SDavid Sterba root_item); 70167addf29SFilipe Manana if (ret) { 70267addf29SFilipe Manana /* 70367addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 70467addf29SFilipe Manana * tree block so that we don't leak space and leave the 70567addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 7067a163608SFilipe Manana * extent tree with a backreference for a root that does not 707212a58fdSFilipe Manana * exists). 70867addf29SFilipe Manana */ 709212a58fdSFilipe Manana btrfs_tree_lock(leaf); 710212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 711212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7127a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 71367addf29SFilipe Manana free_extent_buffer(leaf); 7142256e901SOmar Sandoval goto out; 71567addf29SFilipe Manana } 71667addf29SFilipe Manana 71767addf29SFilipe Manana free_extent_buffer(leaf); 71867addf29SFilipe Manana leaf = NULL; 719f46b5a66SChristoph Hellwig 7202dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 72179787eaaSJeff Mahoney if (IS_ERR(new_root)) { 72279787eaaSJeff Mahoney ret = PTR_ERR(new_root); 72366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7242256e901SOmar Sandoval goto out; 72579787eaaSJeff Mahoney } 7262256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7272dfb1e43SQu Wenruo anon_dev = 0; 7283538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7293538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 73076dda93cSYan, Zheng 731221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 732221581e4SJosef Bacik if (ret) { 733221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7342256e901SOmar Sandoval goto out; 735c7e54b51SJosef Bacik } 7360660b5afSChris Mason 737cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7386bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 739caae78e0SOmar Sandoval if (ret) { 74066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 741caae78e0SOmar Sandoval goto out; 742caae78e0SOmar Sandoval } 743dd5f9615SStefan Behrens 744caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 745caae78e0SOmar Sandoval if (ret) { 746caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 747caae78e0SOmar Sandoval goto out; 748caae78e0SOmar Sandoval } 749caae78e0SOmar Sandoval 750caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 751caae78e0SOmar Sandoval new_inode_args.inode = NULL; 752f46b5a66SChristoph Hellwig 7532256e901SOmar Sandoval out: 754d5c12070SMiao Xie trans->block_rsv = NULL; 755d5c12070SMiao Xie trans->bytes_reserved = 0; 756e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 757de6e8200SLiu Bo 7581b58ae0eSFilipe Manana if (ret) 7591b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7601b58ae0eSFilipe Manana else 7611b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7623538d68dSOmar Sandoval out_new_inode_args: 7633538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 764a1fd0c35SOmar Sandoval out_inode: 7653538d68dSOmar Sandoval iput(new_inode_args.inode); 7662256e901SOmar Sandoval out_anon_dev: 7672dfb1e43SQu Wenruo if (anon_dev) 7682dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7692256e901SOmar Sandoval out_root_item: 77049a3c4d9SDavid Sterba kfree(root_item); 77149a3c4d9SDavid Sterba return ret; 772f46b5a66SChristoph Hellwig } 773f46b5a66SChristoph Hellwig 774e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7759babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 776e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 777f46b5a66SChristoph Hellwig { 7780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7792e4bfab9SYan, Zheng struct inode *inode; 780f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7813538d68dSOmar Sandoval unsigned int trans_num_items; 782f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7832e4bfab9SYan, Zheng int ret; 784f46b5a66SChristoph Hellwig 785813febdbSJosef Bacik /* We do not support snapshotting right now. */ 786813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 787813febdbSJosef Bacik btrfs_warn(fs_info, 788813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 789813febdbSJosef Bacik return -EOPNOTSUPP; 790813febdbSJosef Bacik } 791813febdbSJosef Bacik 79292a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 793f46b5a66SChristoph Hellwig return -EINVAL; 794f46b5a66SChristoph Hellwig 795eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 796eede2bf3SOmar Sandoval btrfs_warn(fs_info, 797eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 798eede2bf3SOmar Sandoval return -ETXTBSY; 799eede2bf3SOmar Sandoval } 800eede2bf3SOmar Sandoval 80123269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 802a1ee7362SDavid Sterba if (!pending_snapshot) 803a1ee7362SDavid Sterba return -ENOMEM; 804a1ee7362SDavid Sterba 8052dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8062dfb1e43SQu Wenruo if (ret < 0) 8072dfb1e43SQu Wenruo goto free_pending; 808b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 80923269bf5SDavid Sterba GFP_KERNEL); 8108546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8118546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 812b0c0ea63SDavid Sterba ret = -ENOMEM; 813b0c0ea63SDavid Sterba goto free_pending; 814b0c0ea63SDavid Sterba } 815b0c0ea63SDavid Sterba 81666d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 81766d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 818d5c12070SMiao Xie /* 8193538d68dSOmar Sandoval * 1 to add dir item 8203538d68dSOmar Sandoval * 1 to add dir index 8213538d68dSOmar Sandoval * 1 to update parent inode item 822d5c12070SMiao Xie */ 8233538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 824d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8253538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8263538d68dSOmar Sandoval trans_num_items, false); 827d5c12070SMiao Xie if (ret) 828c11fbb6eSRobbie Ko goto free_pending; 829d5c12070SMiao Xie 830a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 831a22285a6SYan, Zheng pending_snapshot->root = root; 832b83cc969SLi Zefan pending_snapshot->readonly = readonly; 833e9662f70SMiao Xie pending_snapshot->dir = dir; 8348696c533SMiao Xie pending_snapshot->inherit = inherit; 835a22285a6SYan, Zheng 836d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 837a22285a6SYan, Zheng if (IS_ERR(trans)) { 838a22285a6SYan, Zheng ret = PTR_ERR(trans); 839a22285a6SYan, Zheng goto fail; 840a22285a6SYan, Zheng } 841a22285a6SYan, Zheng 84228b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8439babda9fSNikolay Borisov 8443a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 845aec8030aSMiao Xie if (ret) 846c37b2b62SJosef Bacik goto fail; 847a22285a6SYan, Zheng 848a22285a6SYan, Zheng ret = pending_snapshot->error; 849f46b5a66SChristoph Hellwig if (ret) 8502e4bfab9SYan, Zheng goto fail; 851f46b5a66SChristoph Hellwig 852d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 853d3797308SChris Mason if (ret) 854d3797308SChris Mason goto fail; 855d3797308SChris Mason 8562b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8572e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8582e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8592e4bfab9SYan, Zheng goto fail; 8602e4bfab9SYan, Zheng } 8615662344bSTsutomu Itoh 8622e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8632e4bfab9SYan, Zheng ret = 0; 8642dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8652e4bfab9SYan, Zheng fail: 8662dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8672dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8682dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 86900246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 870e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 871b0c0ea63SDavid Sterba free_pending: 8722dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8732dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 874b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8758546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 876a1ee7362SDavid Sterba kfree(pending_snapshot); 877a1ee7362SDavid Sterba 878f46b5a66SChristoph Hellwig return ret; 879f46b5a66SChristoph Hellwig } 880f46b5a66SChristoph Hellwig 8814260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8824260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8834260f7c7SSage Weil * whether the type of victim is right. 8844260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8854260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8864260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8874260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8884260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8894260f7c7SSage Weil * a. be owner of dir, or 8904260f7c7SSage Weil * b. be owner of victim, or 8914260f7c7SSage Weil * c. have CAP_FOWNER capability 89201327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8934260f7c7SSage Weil * links pointing to it. 8944260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8954260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8964260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8974260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8984260f7c7SSage Weil * nfs_async_unlink(). 8994260f7c7SSage Weil */ 9004260f7c7SSage Weil 901*4609e1f1SChristian Brauner static int btrfs_may_delete(struct mnt_idmap *idmap, 902c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 9034260f7c7SSage Weil { 9044260f7c7SSage Weil int error; 905*4609e1f1SChristian Brauner struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); 9064260f7c7SSage Weil 9072b0143b5SDavid Howells if (d_really_is_negative(victim)) 9084260f7c7SSage Weil return -ENOENT; 9094260f7c7SSage Weil 9102b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9114fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9124260f7c7SSage Weil 913*4609e1f1SChristian Brauner error = inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC); 9144260f7c7SSage Weil if (error) 9154260f7c7SSage Weil return error; 9164260f7c7SSage Weil if (IS_APPEND(dir)) 9174260f7c7SSage Weil return -EPERM; 918c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 919ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 920ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9214260f7c7SSage Weil return -EPERM; 9224260f7c7SSage Weil if (isdir) { 923e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9244260f7c7SSage Weil return -ENOTDIR; 9254260f7c7SSage Weil if (IS_ROOT(victim)) 9264260f7c7SSage Weil return -EBUSY; 927e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9284260f7c7SSage Weil return -EISDIR; 9294260f7c7SSage Weil if (IS_DEADDIR(dir)) 9304260f7c7SSage Weil return -ENOENT; 9314260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9324260f7c7SSage Weil return -EBUSY; 9334260f7c7SSage Weil return 0; 9344260f7c7SSage Weil } 9354260f7c7SSage Weil 936cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 937*4609e1f1SChristian Brauner static inline int btrfs_may_create(struct mnt_idmap *idmap, 9384d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 939cb8e7090SChristoph Hellwig { 9402b0143b5SDavid Howells if (d_really_is_positive(child)) 941cb8e7090SChristoph Hellwig return -EEXIST; 942cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 943cb8e7090SChristoph Hellwig return -ENOENT; 944*4609e1f1SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, idmap)) 9455474bf40SChristian Brauner return -EOVERFLOW; 946*4609e1f1SChristian Brauner return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC); 947cb8e7090SChristoph Hellwig } 948cb8e7090SChristoph Hellwig 949cb8e7090SChristoph Hellwig /* 950cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 951cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 952cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 953cb8e7090SChristoph Hellwig */ 95492872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 955*4609e1f1SChristian Brauner struct mnt_idmap *idmap, 95652f75f4fSDavid Sterba const char *name, int namelen, 95772fd032eSSage Weil struct btrfs_root *snap_src, 9589babda9fSNikolay Borisov bool readonly, 9598696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 960cb8e7090SChristoph Hellwig { 9612b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 963cb8e7090SChristoph Hellwig struct dentry *dentry; 9646db75318SSweet Tea Dorminy struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); 965*4609e1f1SChristian Brauner struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); 966cb8e7090SChristoph Hellwig int error; 967cb8e7090SChristoph Hellwig 96800235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96900235411SAl Viro if (error == -EINTR) 97000235411SAl Viro return error; 971cb8e7090SChristoph Hellwig 972*4609e1f1SChristian Brauner dentry = lookup_one(idmap, name, parent->dentry, namelen); 973cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 974cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 975cb8e7090SChristoph Hellwig goto out_unlock; 976cb8e7090SChristoph Hellwig 977*4609e1f1SChristian Brauner error = btrfs_may_create(idmap, dir, dentry); 978cb8e7090SChristoph Hellwig if (error) 979a874a63eSLiu Bo goto out_dput; 980cb8e7090SChristoph Hellwig 9819c52057cSChris Mason /* 9829c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9839c52057cSChris Mason * check for them now when we can safely fail 9849c52057cSChris Mason */ 9859c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 986e43eec81SSweet Tea Dorminy dir->i_ino, &name_str); 9879c52057cSChris Mason if (error) 9889c52057cSChris Mason goto out_dput; 9899c52057cSChris Mason 9900b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 99176dda93cSYan, Zheng 99276dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 99376dda93cSYan, Zheng goto out_up_read; 99476dda93cSYan, Zheng 9959babda9fSNikolay Borisov if (snap_src) 9969babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9979babda9fSNikolay Borisov else 99870dc55f4SOmar Sandoval error = create_subvol(mnt_userns, dir, dentry, inherit); 9999babda9fSNikolay Borisov 100076dda93cSYan, Zheng if (!error) 100176dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 100276dda93cSYan, Zheng out_up_read: 10030b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1004cb8e7090SChristoph Hellwig out_dput: 1005cb8e7090SChristoph Hellwig dput(dentry); 1006cb8e7090SChristoph Hellwig out_unlock: 1007e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(dir), 0); 1008cb8e7090SChristoph Hellwig return error; 1009cb8e7090SChristoph Hellwig } 1010cb8e7090SChristoph Hellwig 1011c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1012*4609e1f1SChristian Brauner struct mnt_idmap *idmap, 1013c11fbb6eSRobbie Ko const char *name, int namelen, 1014c11fbb6eSRobbie Ko struct btrfs_root *root, 1015c11fbb6eSRobbie Ko bool readonly, 1016c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1017c11fbb6eSRobbie Ko { 1018c11fbb6eSRobbie Ko int ret; 1019c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1020c11fbb6eSRobbie Ko 1021c11fbb6eSRobbie Ko /* 1022c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1023c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1024c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1025c11fbb6eSRobbie Ko */ 1026c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1027c11fbb6eSRobbie Ko 1028f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1029c11fbb6eSRobbie Ko if (ret) 1030c11fbb6eSRobbie Ko goto out; 1031c11fbb6eSRobbie Ko 1032c11fbb6eSRobbie Ko /* 1033c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1034c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1035c11fbb6eSRobbie Ko * creation. 1036c11fbb6eSRobbie Ko */ 1037c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1038c11fbb6eSRobbie Ko snapshot_force_cow = true; 1039c11fbb6eSRobbie Ko 1040c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1041c11fbb6eSRobbie Ko 1042*4609e1f1SChristian Brauner ret = btrfs_mksubvol(parent, idmap, name, namelen, 1043c11fbb6eSRobbie Ko root, readonly, inherit); 1044c11fbb6eSRobbie Ko out: 1045c11fbb6eSRobbie Ko if (snapshot_force_cow) 1046c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1047c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1048c11fbb6eSRobbie Ko return ret; 1049c11fbb6eSRobbie Ko } 1050c11fbb6eSRobbie Ko 1051d5633b0dSQu Wenruo /* 105217aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 105317aaa434SDavid Sterba * 105417aaa434SDavid Sterba * Return: 105517aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 105617aaa434SDavid Sterba * >0 - normal mode, something else is running, 105717aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 105817aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 105917aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 106017aaa434SDavid Sterba */ 106117aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 106217aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 106317aaa434SDavid Sterba { 106417aaa434SDavid Sterba if (!cancel) { 106517aaa434SDavid Sterba /* Start normal op */ 106617aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 106717aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 106817aaa434SDavid Sterba /* Exclusive operation is now claimed */ 106917aaa434SDavid Sterba return 0; 107017aaa434SDavid Sterba } 107117aaa434SDavid Sterba 107217aaa434SDavid Sterba /* Cancel running op */ 107317aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 107417aaa434SDavid Sterba /* 107517aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 107617aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 107717aaa434SDavid Sterba * or it has finished and no waiting will happen. 107817aaa434SDavid Sterba */ 107917aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 108017aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 108117aaa434SDavid Sterba 108217aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 108317aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 108417aaa434SDavid Sterba TASK_INTERRUPTIBLE); 108517aaa434SDavid Sterba 108617aaa434SDavid Sterba return -ECANCELED; 108717aaa434SDavid Sterba } 108817aaa434SDavid Sterba 108917aaa434SDavid Sterba /* Something else is running or none */ 109017aaa434SDavid Sterba return -ENOTCONN; 109117aaa434SDavid Sterba } 109217aaa434SDavid Sterba 1093198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 109476dda93cSYan, Zheng void __user *arg) 1095f46b5a66SChristoph Hellwig { 1096562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 10970b246afaSJeff Mahoney struct inode *inode = file_inode(file); 10980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1099f46b5a66SChristoph Hellwig u64 new_size; 1100f46b5a66SChristoph Hellwig u64 old_size; 1101f46b5a66SChristoph Hellwig u64 devid = 1; 11020b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1103f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1104f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1105f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1106f46b5a66SChristoph Hellwig char *sizestr; 11079a40f122SGui Hecheng char *retptr; 1108f46b5a66SChristoph Hellwig char *devstr = NULL; 1109f46b5a66SChristoph Hellwig int ret = 0; 1110f46b5a66SChristoph Hellwig int mod = 0; 1111bb059a37SDavid Sterba bool cancel; 1112f46b5a66SChristoph Hellwig 1113e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1114e441d54dSChris Mason return -EPERM; 1115e441d54dSChris Mason 1116198605a8SMiao Xie ret = mnt_want_write_file(file); 1117198605a8SMiao Xie if (ret) 1118198605a8SMiao Xie return ret; 1119198605a8SMiao Xie 1120bb059a37SDavid Sterba /* 1121bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1122bb059a37SDavid Sterba * distinguish regular resize and cancel 1123bb059a37SDavid Sterba */ 1124dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1125c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1126c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1127bb059a37SDavid Sterba goto out_drop; 1128c9e9f97bSIlya Dryomov } 11295516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1130f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1131bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1132bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1133bb059a37SDavid Sterba if (ret) 1134bb059a37SDavid Sterba goto out_free; 1135bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1136bb059a37SDavid Sterba 1137f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1138f46b5a66SChristoph Hellwig if (devstr) { 1139f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1140f46b5a66SChristoph Hellwig *devstr = '\0'; 1141f46b5a66SChristoph Hellwig devstr = vol_args->name; 114258dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 114358dfae63SZhangZhen if (ret) 1144bb059a37SDavid Sterba goto out_finish; 1145dfd79829SMiao Xie if (!devid) { 1146dfd79829SMiao Xie ret = -EINVAL; 1147bb059a37SDavid Sterba goto out_finish; 1148dfd79829SMiao Xie } 11490b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1150f46b5a66SChristoph Hellwig } 1151dba60f3fSMiao Xie 1152562d7b15SJosef Bacik args.devid = devid; 1153562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 1154f46b5a66SChristoph Hellwig if (!device) { 11550b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1156c1c9ff7cSGeert Uytterhoeven devid); 1157dfd79829SMiao Xie ret = -ENODEV; 1158bb059a37SDavid Sterba goto out_finish; 1159f46b5a66SChristoph Hellwig } 1160dba60f3fSMiao Xie 1161ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 11620b246afaSJeff Mahoney btrfs_info(fs_info, 1163efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1164c1c9ff7cSGeert Uytterhoeven devid); 1165dfd79829SMiao Xie ret = -EPERM; 1166bb059a37SDavid Sterba goto out_finish; 11674e42ae1bSLiu Bo } 11684e42ae1bSLiu Bo 1169f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1170cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 1171f46b5a66SChristoph Hellwig else { 1172f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1173f46b5a66SChristoph Hellwig mod = -1; 1174f46b5a66SChristoph Hellwig sizestr++; 1175f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1176f46b5a66SChristoph Hellwig mod = 1; 1177f46b5a66SChristoph Hellwig sizestr++; 1178f46b5a66SChristoph Hellwig } 11799a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 11809a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1181f46b5a66SChristoph Hellwig ret = -EINVAL; 1182bb059a37SDavid Sterba goto out_finish; 1183f46b5a66SChristoph Hellwig } 1184f46b5a66SChristoph Hellwig } 1185f46b5a66SChristoph Hellwig 1186401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1187dfd79829SMiao Xie ret = -EPERM; 1188bb059a37SDavid Sterba goto out_finish; 118963a212abSStefan Behrens } 119063a212abSStefan Behrens 11917cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1192f46b5a66SChristoph Hellwig 1193f46b5a66SChristoph Hellwig if (mod < 0) { 1194f46b5a66SChristoph Hellwig if (new_size > old_size) { 1195f46b5a66SChristoph Hellwig ret = -EINVAL; 1196bb059a37SDavid Sterba goto out_finish; 1197f46b5a66SChristoph Hellwig } 1198f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1199f46b5a66SChristoph Hellwig } else if (mod > 0) { 1200eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1201902c68a4SGui Hecheng ret = -ERANGE; 1202bb059a37SDavid Sterba goto out_finish; 1203eb8052e0SWenliang Fan } 1204f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1205f46b5a66SChristoph Hellwig } 1206f46b5a66SChristoph Hellwig 1207ee22184bSByongho Lee if (new_size < SZ_256M) { 1208f46b5a66SChristoph Hellwig ret = -EINVAL; 1209bb059a37SDavid Sterba goto out_finish; 1210f46b5a66SChristoph Hellwig } 1211cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 1212f46b5a66SChristoph Hellwig ret = -EFBIG; 1213bb059a37SDavid Sterba goto out_finish; 1214f46b5a66SChristoph Hellwig } 1215f46b5a66SChristoph Hellwig 121647f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1217f46b5a66SChristoph Hellwig 1218f46b5a66SChristoph Hellwig if (new_size > old_size) { 1219a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 122098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 122198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1222bb059a37SDavid Sterba goto out_finish; 122398d5dc13STsutomu Itoh } 1224f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 12253a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1226ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1227f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 12280253f40eSjeff.liu } /* equal, nothing need to do */ 1229f46b5a66SChristoph Hellwig 1230faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1231faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1232faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1233cb3e217bSQu Wenruo btrfs_dev_name(device), device->devid, 1234faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1235bb059a37SDavid Sterba out_finish: 1236bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1237c9e9f97bSIlya Dryomov out_free: 1238f46b5a66SChristoph Hellwig kfree(vol_args); 1239bb059a37SDavid Sterba out_drop: 124018f39c41SIlya Dryomov mnt_drop_write_file(file); 1241f46b5a66SChristoph Hellwig return ret; 1242f46b5a66SChristoph Hellwig } 1243f46b5a66SChristoph Hellwig 12445d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 1245*4609e1f1SChristian Brauner struct mnt_idmap *idmap, 124652f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 12475d54c67eSNikolay Borisov bool readonly, 12488696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1249f46b5a66SChristoph Hellwig { 1250f46b5a66SChristoph Hellwig int namelen; 12513de4586cSChris Mason int ret = 0; 1252*4609e1f1SChristian Brauner struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); 1253f46b5a66SChristoph Hellwig 1254325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1255325c50e3SJeff Mahoney return -ENOTDIR; 1256325c50e3SJeff Mahoney 1257a874a63eSLiu Bo ret = mnt_want_write_file(file); 1258a874a63eSLiu Bo if (ret) 1259a874a63eSLiu Bo goto out; 1260a874a63eSLiu Bo 126172fd032eSSage Weil namelen = strlen(name); 126272fd032eSSage Weil if (strchr(name, '/')) { 1263f46b5a66SChristoph Hellwig ret = -EINVAL; 1264a874a63eSLiu Bo goto out_drop_write; 1265f46b5a66SChristoph Hellwig } 1266f46b5a66SChristoph Hellwig 126716780cabSChris Mason if (name[0] == '.' && 126816780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 126916780cabSChris Mason ret = -EEXIST; 1270a874a63eSLiu Bo goto out_drop_write; 127116780cabSChris Mason } 127216780cabSChris Mason 12733de4586cSChris Mason if (subvol) { 1274*4609e1f1SChristian Brauner ret = btrfs_mksubvol(&file->f_path, idmap, name, 12754d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1276cb8e7090SChristoph Hellwig } else { 12772903ff01SAl Viro struct fd src = fdget(fd); 12783de4586cSChris Mason struct inode *src_inode; 12792903ff01SAl Viro if (!src.file) { 12803de4586cSChris Mason ret = -EINVAL; 1281a874a63eSLiu Bo goto out_drop_write; 12823de4586cSChris Mason } 12833de4586cSChris Mason 1284496ad9aaSAl Viro src_inode = file_inode(src.file); 1285496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1286c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1287efe120a0SFrank Holton "Snapshot src from another FS"); 128823ad5b17SKusanagi Kouichi ret = -EXDEV; 12894d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 1290d0242061SDavid Sterba /* 1291d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1292d0242061SDavid Sterba * are limited to own subvolumes only 1293d0242061SDavid Sterba */ 1294d0242061SDavid Sterba ret = -EPERM; 1295ecd18815SAl Viro } else { 1296*4609e1f1SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, idmap, 12974d4340c9SChristian Brauner name, namelen, 129872fd032eSSage Weil BTRFS_I(src_inode)->root, 12995d54c67eSNikolay Borisov readonly, inherit); 1300ecd18815SAl Viro } 13012903ff01SAl Viro fdput(src); 1302cb8e7090SChristoph Hellwig } 1303a874a63eSLiu Bo out_drop_write: 1304a874a63eSLiu Bo mnt_drop_write_file(file); 1305f46b5a66SChristoph Hellwig out: 130672fd032eSSage Weil return ret; 130772fd032eSSage Weil } 130872fd032eSSage Weil 130972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1310fa0d2b9bSLi Zefan void __user *arg, int subvol) 131172fd032eSSage Weil { 1312fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 131372fd032eSSage Weil int ret; 131472fd032eSSage Weil 1315325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1316325c50e3SJeff Mahoney return -ENOTDIR; 1317325c50e3SJeff Mahoney 1318fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1319fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1320fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1321fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1322fa0d2b9bSLi Zefan 1323*4609e1f1SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), 13244d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13254d4340c9SChristian Brauner false, NULL); 1326fa0d2b9bSLi Zefan 1327fa0d2b9bSLi Zefan kfree(vol_args); 1328fa0d2b9bSLi Zefan return ret; 1329fa0d2b9bSLi Zefan } 1330fa0d2b9bSLi Zefan 1331fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1332fa0d2b9bSLi Zefan void __user *arg, int subvol) 1333fa0d2b9bSLi Zefan { 1334fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1335fa0d2b9bSLi Zefan int ret; 1336b83cc969SLi Zefan bool readonly = false; 13376f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 133872fd032eSSage Weil 1339325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1340325c50e3SJeff Mahoney return -ENOTDIR; 1341325c50e3SJeff Mahoney 1342fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1343fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1344fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1345fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1346fdfb1e4fSLi Zefan 1347673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1348b83cc969SLi Zefan ret = -EOPNOTSUPP; 1349c47ca32dSDan Carpenter goto free_args; 1350fdfb1e4fSLi Zefan } 1351fdfb1e4fSLi Zefan 1352b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1353b83cc969SLi Zefan readonly = true; 13546f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 13555011c5a6SDan Carpenter u64 nums; 13565011c5a6SDan Carpenter 13575011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 13585011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 13596f72c7e2SArne Jansen ret = -EINVAL; 1360c47ca32dSDan Carpenter goto free_args; 13616f72c7e2SArne Jansen } 13626f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 13636f72c7e2SArne Jansen if (IS_ERR(inherit)) { 13646f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1365c47ca32dSDan Carpenter goto free_args; 13666f72c7e2SArne Jansen } 13675011c5a6SDan Carpenter 13685011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 13695011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 13705011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 13715011c5a6SDan Carpenter ret = -EINVAL; 13725011c5a6SDan Carpenter goto free_inherit; 13735011c5a6SDan Carpenter } 13745011c5a6SDan Carpenter 13755011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 13765011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 13775011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 13785011c5a6SDan Carpenter ret = -EINVAL; 13795011c5a6SDan Carpenter goto free_inherit; 13805011c5a6SDan Carpenter } 13816f72c7e2SArne Jansen } 138275eaa0e2SSage Weil 1383*4609e1f1SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), 13844d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13854d4340c9SChristian Brauner readonly, inherit); 1386c47ca32dSDan Carpenter if (ret) 1387c47ca32dSDan Carpenter goto free_inherit; 1388c47ca32dSDan Carpenter free_inherit: 13896f72c7e2SArne Jansen kfree(inherit); 1390c47ca32dSDan Carpenter free_args: 1391c47ca32dSDan Carpenter kfree(vol_args); 1392f46b5a66SChristoph Hellwig return ret; 1393f46b5a66SChristoph Hellwig } 1394f46b5a66SChristoph Hellwig 13959ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 13960caa102dSLi Zefan void __user *arg) 13970caa102dSLi Zefan { 13980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13990caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14000caa102dSLi Zefan int ret = 0; 14010caa102dSLi Zefan u64 flags = 0; 14020caa102dSLi Zefan 14034a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 14040caa102dSLi Zefan return -EINVAL; 14050caa102dSLi Zefan 14060b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 14070caa102dSLi Zefan if (btrfs_root_readonly(root)) 14080caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 14090b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 14100caa102dSLi Zefan 14110caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 14120caa102dSLi Zefan ret = -EFAULT; 14130caa102dSLi Zefan 14140caa102dSLi Zefan return ret; 14150caa102dSLi Zefan } 14160caa102dSLi Zefan 14170caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 14180caa102dSLi Zefan void __user *arg) 14190caa102dSLi Zefan { 1420496ad9aaSAl Viro struct inode *inode = file_inode(file); 14210b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14220caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14230caa102dSLi Zefan struct btrfs_trans_handle *trans; 14240caa102dSLi Zefan u64 root_flags; 14250caa102dSLi Zefan u64 flags; 14260caa102dSLi Zefan int ret = 0; 14270caa102dSLi Zefan 142839e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 1429bd60ea0fSDavid Sterba return -EPERM; 1430bd60ea0fSDavid Sterba 1431b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1432b9ca0664SLiu Bo if (ret) 1433b9ca0664SLiu Bo goto out; 14340caa102dSLi Zefan 14354a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1436b9ca0664SLiu Bo ret = -EINVAL; 1437b9ca0664SLiu Bo goto out_drop_write; 1438b9ca0664SLiu Bo } 14390caa102dSLi Zefan 1440b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1441b9ca0664SLiu Bo ret = -EFAULT; 1442b9ca0664SLiu Bo goto out_drop_write; 1443b9ca0664SLiu Bo } 14440caa102dSLi Zefan 1445b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1446b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1447b9ca0664SLiu Bo goto out_drop_write; 1448b9ca0664SLiu Bo } 14490caa102dSLi Zefan 14500b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 14510caa102dSLi Zefan 14520caa102dSLi Zefan /* nothing to do */ 14530caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1454b9ca0664SLiu Bo goto out_drop_sem; 14550caa102dSLi Zefan 14560caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 14572c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 14580caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14590caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 14602c686537SDavid Sterba } else { 14612c686537SDavid Sterba /* 14622c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 14632c686537SDavid Sterba * send 14642c686537SDavid Sterba */ 14652c686537SDavid Sterba spin_lock(&root->root_item_lock); 14662c686537SDavid Sterba if (root->send_in_progress == 0) { 14670caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14680caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 14692c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14702c686537SDavid Sterba } else { 14712c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14720b246afaSJeff Mahoney btrfs_warn(fs_info, 14732c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 14742c686537SDavid Sterba root->root_key.objectid); 14752c686537SDavid Sterba ret = -EPERM; 14762c686537SDavid Sterba goto out_drop_sem; 14772c686537SDavid Sterba } 14782c686537SDavid Sterba } 14790caa102dSLi Zefan 14800caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 14810caa102dSLi Zefan if (IS_ERR(trans)) { 14820caa102dSLi Zefan ret = PTR_ERR(trans); 14830caa102dSLi Zefan goto out_reset; 14840caa102dSLi Zefan } 14850caa102dSLi Zefan 14860b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 14870caa102dSLi Zefan &root->root_key, &root->root_item); 14889417ebc8SNikolay Borisov if (ret < 0) { 14899417ebc8SNikolay Borisov btrfs_end_transaction(trans); 14909417ebc8SNikolay Borisov goto out_reset; 14919417ebc8SNikolay Borisov } 14920caa102dSLi Zefan 14939417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 14949417ebc8SNikolay Borisov 14950caa102dSLi Zefan out_reset: 14960caa102dSLi Zefan if (ret) 14970caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1498b9ca0664SLiu Bo out_drop_sem: 14990b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1500b9ca0664SLiu Bo out_drop_write: 1501b9ca0664SLiu Bo mnt_drop_write_file(file); 1502b9ca0664SLiu Bo out: 15030caa102dSLi Zefan return ret; 15040caa102dSLi Zefan } 15050caa102dSLi Zefan 1506ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1507ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1508ac8e9819SChris Mason { 1509abc6e134SChris Mason struct btrfs_key test; 1510abc6e134SChris Mason int ret; 1511abc6e134SChris Mason 1512abc6e134SChris Mason test.objectid = sk->min_objectid; 1513abc6e134SChris Mason test.type = sk->min_type; 1514abc6e134SChris Mason test.offset = sk->min_offset; 1515abc6e134SChris Mason 1516abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1517abc6e134SChris Mason if (ret < 0) 1518ac8e9819SChris Mason return 0; 1519abc6e134SChris Mason 1520abc6e134SChris Mason test.objectid = sk->max_objectid; 1521abc6e134SChris Mason test.type = sk->max_type; 1522abc6e134SChris Mason test.offset = sk->max_offset; 1523abc6e134SChris Mason 1524abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1525abc6e134SChris Mason if (ret > 0) 1526ac8e9819SChris Mason return 0; 1527ac8e9819SChris Mason return 1; 1528ac8e9819SChris Mason } 1529ac8e9819SChris Mason 1530df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1531ac8e9819SChris Mason struct btrfs_key *key, 1532ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 15339b6e817dSGerhard Heift size_t *buf_size, 1534ba346b35SGerhard Heift char __user *ubuf, 1535ac8e9819SChris Mason unsigned long *sk_offset, 1536ac8e9819SChris Mason int *num_found) 1537ac8e9819SChris Mason { 1538ac8e9819SChris Mason u64 found_transid; 1539ac8e9819SChris Mason struct extent_buffer *leaf; 1540ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1541dd81d459SNaohiro Aota struct btrfs_key test; 1542ac8e9819SChris Mason unsigned long item_off; 1543ac8e9819SChris Mason unsigned long item_len; 1544ac8e9819SChris Mason int nritems; 1545ac8e9819SChris Mason int i; 1546ac8e9819SChris Mason int slot; 1547ac8e9819SChris Mason int ret = 0; 1548ac8e9819SChris Mason 1549ac8e9819SChris Mason leaf = path->nodes[0]; 1550ac8e9819SChris Mason slot = path->slots[0]; 1551ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1552ac8e9819SChris Mason 1553ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1554ac8e9819SChris Mason i = nritems; 1555ac8e9819SChris Mason goto advance_key; 1556ac8e9819SChris Mason } 1557ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1558ac8e9819SChris Mason 1559ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1560ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 15613212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 1562ac8e9819SChris Mason 156303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 156403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 156503b71c6cSGabriel de Perthuis continue; 156603b71c6cSGabriel de Perthuis 15679b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 15688f5f6178SGerhard Heift if (*num_found) { 1569ac8e9819SChris Mason ret = 1; 15708f5f6178SGerhard Heift goto out; 15718f5f6178SGerhard Heift } 15728f5f6178SGerhard Heift 15738f5f6178SGerhard Heift /* 15748f5f6178SGerhard Heift * return one empty item back for v1, which does not 15758f5f6178SGerhard Heift * handle -EOVERFLOW 15768f5f6178SGerhard Heift */ 15778f5f6178SGerhard Heift 15789b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1579ac8e9819SChris Mason item_len = 0; 15808f5f6178SGerhard Heift ret = -EOVERFLOW; 15818f5f6178SGerhard Heift } 1582ac8e9819SChris Mason 15839b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1584ac8e9819SChris Mason ret = 1; 158525c9bc2eSGerhard Heift goto out; 1586ac8e9819SChris Mason } 1587ac8e9819SChris Mason 1588ac8e9819SChris Mason sh.objectid = key->objectid; 1589ac8e9819SChris Mason sh.offset = key->offset; 1590ac8e9819SChris Mason sh.type = key->type; 1591ac8e9819SChris Mason sh.len = item_len; 1592ac8e9819SChris Mason sh.transid = found_transid; 1593ac8e9819SChris Mason 1594a48b73ecSJosef Bacik /* 1595a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 1596a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 1597a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 1598a48b73ecSJosef Bacik * properly this next time through 1599a48b73ecSJosef Bacik */ 1600a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 1601a48b73ecSJosef Bacik ret = 0; 1602ba346b35SGerhard Heift goto out; 1603ba346b35SGerhard Heift } 1604ba346b35SGerhard Heift 1605ac8e9819SChris Mason *sk_offset += sizeof(sh); 1606ac8e9819SChris Mason 1607ac8e9819SChris Mason if (item_len) { 1608ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1609a48b73ecSJosef Bacik /* 1610a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 1611a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 1612a48b73ecSJosef Bacik */ 1613a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 1614ba346b35SGerhard Heift item_off, item_len)) { 1615a48b73ecSJosef Bacik ret = 0; 1616a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 1617ba346b35SGerhard Heift goto out; 1618ba346b35SGerhard Heift } 1619ba346b35SGerhard Heift 1620ac8e9819SChris Mason *sk_offset += item_len; 1621ac8e9819SChris Mason } 1622e2156867SHugo Mills (*num_found)++; 1623ac8e9819SChris Mason 16248f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 16258f5f6178SGerhard Heift goto out; 16268f5f6178SGerhard Heift 162725c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 162825c9bc2eSGerhard Heift ret = 1; 162925c9bc2eSGerhard Heift goto out; 163025c9bc2eSGerhard Heift } 1631ac8e9819SChris Mason } 1632ac8e9819SChris Mason advance_key: 1633ac8e9819SChris Mason ret = 0; 1634dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 1635dd81d459SNaohiro Aota test.type = sk->max_type; 1636dd81d459SNaohiro Aota test.offset = sk->max_offset; 1637dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 1638dd81d459SNaohiro Aota ret = 1; 1639dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 1640abc6e134SChris Mason key->offset++; 1641dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 1642abc6e134SChris Mason key->offset = 0; 1643abc6e134SChris Mason key->type++; 1644dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 1645abc6e134SChris Mason key->offset = 0; 1646abc6e134SChris Mason key->type = 0; 1647abc6e134SChris Mason key->objectid++; 1648abc6e134SChris Mason } else 1649abc6e134SChris Mason ret = 1; 165025c9bc2eSGerhard Heift out: 1651ba346b35SGerhard Heift /* 1652ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 1653ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 1654ba346b35SGerhard Heift * * all items were found 1655ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 1656ba346b35SGerhard Heift * leaf 1657ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 1658ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 1659ba346b35SGerhard Heift */ 1660ac8e9819SChris Mason return ret; 1661ac8e9819SChris Mason } 1662ac8e9819SChris Mason 1663ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 166412544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 16659b6e817dSGerhard Heift size_t *buf_size, 1666ba346b35SGerhard Heift char __user *ubuf) 1667ac8e9819SChris Mason { 16680b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 1669ac8e9819SChris Mason struct btrfs_root *root; 1670ac8e9819SChris Mason struct btrfs_key key; 1671ac8e9819SChris Mason struct btrfs_path *path; 1672ac8e9819SChris Mason int ret; 1673ac8e9819SChris Mason int num_found = 0; 1674ac8e9819SChris Mason unsigned long sk_offset = 0; 1675ac8e9819SChris Mason 16769b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 16779b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 167812544442SGerhard Heift return -EOVERFLOW; 16799b6e817dSGerhard Heift } 168012544442SGerhard Heift 1681ac8e9819SChris Mason path = btrfs_alloc_path(); 1682ac8e9819SChris Mason if (!path) 1683ac8e9819SChris Mason return -ENOMEM; 1684ac8e9819SChris Mason 1685ac8e9819SChris Mason if (sk->tree_id == 0) { 1686ac8e9819SChris Mason /* search the root of the inode that was passed */ 168700246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 1688ac8e9819SChris Mason } else { 168956e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 1690ac8e9819SChris Mason if (IS_ERR(root)) { 1691ac8e9819SChris Mason btrfs_free_path(path); 1692ad1e3d56SMisono Tomohiro return PTR_ERR(root); 1693ac8e9819SChris Mason } 1694ac8e9819SChris Mason } 1695ac8e9819SChris Mason 1696ac8e9819SChris Mason key.objectid = sk->min_objectid; 1697ac8e9819SChris Mason key.type = sk->min_type; 1698ac8e9819SChris Mason key.offset = sk->min_offset; 1699ac8e9819SChris Mason 1700ac8e9819SChris Mason while (1) { 1701bb523b40SAndreas Gruenbacher ret = -EFAULT; 170218788e34SCatalin Marinas /* 170318788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 170418788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 170518788e34SCatalin Marinas */ 170618788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 170718788e34SCatalin Marinas *buf_size - sk_offset)) 1708a48b73ecSJosef Bacik break; 1709a48b73ecSJosef Bacik 17106174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1711ac8e9819SChris Mason if (ret != 0) { 1712ac8e9819SChris Mason if (ret > 0) 1713ac8e9819SChris Mason ret = 0; 1714ac8e9819SChris Mason goto err; 1715ac8e9819SChris Mason } 1716df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 1717ac8e9819SChris Mason &sk_offset, &num_found); 1718b3b4aa74SDavid Sterba btrfs_release_path(path); 171925c9bc2eSGerhard Heift if (ret) 1720ac8e9819SChris Mason break; 1721ac8e9819SChris Mason 1722ac8e9819SChris Mason } 17238f5f6178SGerhard Heift if (ret > 0) 1724ac8e9819SChris Mason ret = 0; 1725ac8e9819SChris Mason err: 1726ac8e9819SChris Mason sk->nr_items = num_found; 172700246528SJosef Bacik btrfs_put_root(root); 1728ac8e9819SChris Mason btrfs_free_path(path); 1729ac8e9819SChris Mason return ret; 1730ac8e9819SChris Mason } 1731ac8e9819SChris Mason 17329ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 1733ac8e9819SChris Mason void __user *argp) 1734ac8e9819SChris Mason { 17350d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 1736ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 1737ac8e9819SChris Mason int ret; 17389b6e817dSGerhard Heift size_t buf_size; 1739ac8e9819SChris Mason 1740ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1741ac8e9819SChris Mason return -EPERM; 1742ac8e9819SChris Mason 1743ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 1744ba346b35SGerhard Heift return -EFAULT; 1745ba346b35SGerhard Heift 1746ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 1747ac8e9819SChris Mason 1748ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 17498f5f6178SGerhard Heift 17508f5f6178SGerhard Heift /* 17518f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 17528f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 17538f5f6178SGerhard Heift */ 17548f5f6178SGerhard Heift if (ret == -EOVERFLOW) 17558f5f6178SGerhard Heift ret = 0; 17568f5f6178SGerhard Heift 1757ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 1758ac8e9819SChris Mason ret = -EFAULT; 1759ac8e9819SChris Mason return ret; 1760ac8e9819SChris Mason } 1761ac8e9819SChris Mason 17629ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 1763cc68a8a5SGerhard Heift void __user *argp) 1764cc68a8a5SGerhard Heift { 17650d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 1766cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 1767cc68a8a5SGerhard Heift int ret; 1768cc68a8a5SGerhard Heift size_t buf_size; 1769ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 1770cc68a8a5SGerhard Heift 1771cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 1772cc68a8a5SGerhard Heift return -EPERM; 1773cc68a8a5SGerhard Heift 1774cc68a8a5SGerhard Heift /* copy search header and buffer size */ 1775cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 1776cc68a8a5SGerhard Heift return -EFAULT; 1777cc68a8a5SGerhard Heift 1778cc68a8a5SGerhard Heift buf_size = args.buf_size; 1779cc68a8a5SGerhard Heift 1780cc68a8a5SGerhard Heift /* limit result size to 16MB */ 1781cc68a8a5SGerhard Heift if (buf_size > buf_limit) 1782cc68a8a5SGerhard Heift buf_size = buf_limit; 1783cc68a8a5SGerhard Heift 1784cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 1785718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 1786cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 1787cc68a8a5SGerhard Heift ret = -EFAULT; 1788cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 1789cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 1790cc68a8a5SGerhard Heift ret = -EFAULT; 1791cc68a8a5SGerhard Heift 179276dda93cSYan, Zheng return ret; 179376dda93cSYan, Zheng } 179476dda93cSYan, Zheng 179598d377a0STARUISI Hiroaki /* 1796ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1797ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 179898d377a0STARUISI Hiroaki */ 179998d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 180098d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 180198d377a0STARUISI Hiroaki { 180298d377a0STARUISI Hiroaki struct btrfs_root *root; 180398d377a0STARUISI Hiroaki struct btrfs_key key; 1804ac8e9819SChris Mason char *ptr; 180598d377a0STARUISI Hiroaki int ret = -1; 180698d377a0STARUISI Hiroaki int slot; 180798d377a0STARUISI Hiroaki int len; 180898d377a0STARUISI Hiroaki int total_len = 0; 180998d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 181098d377a0STARUISI Hiroaki struct extent_buffer *l; 181198d377a0STARUISI Hiroaki struct btrfs_path *path; 181298d377a0STARUISI Hiroaki 181398d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 181498d377a0STARUISI Hiroaki name[0]='\0'; 181598d377a0STARUISI Hiroaki return 0; 181698d377a0STARUISI Hiroaki } 181798d377a0STARUISI Hiroaki 181898d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 181998d377a0STARUISI Hiroaki if (!path) 182098d377a0STARUISI Hiroaki return -ENOMEM; 182198d377a0STARUISI Hiroaki 1822c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 182398d377a0STARUISI Hiroaki 182456e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 182598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 1826ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 182788234012SJosef Bacik root = NULL; 182888234012SJosef Bacik goto out; 182988234012SJosef Bacik } 183098d377a0STARUISI Hiroaki 183198d377a0STARUISI Hiroaki key.objectid = dirid; 183298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18338ad6fcabSChris Mason key.offset = (u64)-1; 183498d377a0STARUISI Hiroaki 183598d377a0STARUISI Hiroaki while (1) { 18360ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 183718674c6cSFilipe David Borba Manana if (ret < 0) 183818674c6cSFilipe David Borba Manana goto out; 183918674c6cSFilipe David Borba Manana else if (ret > 0) { 1840ac8e9819SChris Mason ret = -ENOENT; 184198d377a0STARUISI Hiroaki goto out; 1842ac8e9819SChris Mason } 184318674c6cSFilipe David Borba Manana 184418674c6cSFilipe David Borba Manana l = path->nodes[0]; 184518674c6cSFilipe David Borba Manana slot = path->slots[0]; 184698d377a0STARUISI Hiroaki 184798d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 184898d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 184998d377a0STARUISI Hiroaki ptr -= len + 1; 185098d377a0STARUISI Hiroaki total_len += len + 1; 1851a696cf35SFilipe David Borba Manana if (ptr < name) { 1852a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 185398d377a0STARUISI Hiroaki goto out; 1854a696cf35SFilipe David Borba Manana } 185598d377a0STARUISI Hiroaki 185698d377a0STARUISI Hiroaki *(ptr + len) = '/'; 185798d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 185898d377a0STARUISI Hiroaki 185998d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 186098d377a0STARUISI Hiroaki break; 186198d377a0STARUISI Hiroaki 1862b3b4aa74SDavid Sterba btrfs_release_path(path); 186398d377a0STARUISI Hiroaki key.objectid = key.offset; 18648ad6fcabSChris Mason key.offset = (u64)-1; 186598d377a0STARUISI Hiroaki dirid = key.objectid; 186698d377a0STARUISI Hiroaki } 186777906a50SLi Zefan memmove(name, ptr, total_len); 186898d377a0STARUISI Hiroaki name[total_len] = '\0'; 186998d377a0STARUISI Hiroaki ret = 0; 187098d377a0STARUISI Hiroaki out: 187100246528SJosef Bacik btrfs_put_root(root); 187298d377a0STARUISI Hiroaki btrfs_free_path(path); 1873ac8e9819SChris Mason return ret; 1874ac8e9819SChris Mason } 1875ac8e9819SChris Mason 1876*4609e1f1SChristian Brauner static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap, 18776623d9a0SChristian Brauner struct inode *inode, 187823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 187923d0b79dSTomohiro Misono { 188023d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 188123d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 188223d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 188323d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 188423d0b79dSTomohiro Misono u64 dirid = args->dirid; 188523d0b79dSTomohiro Misono unsigned long item_off; 188623d0b79dSTomohiro Misono unsigned long item_len; 188723d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 188823d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 1889b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 189023d0b79dSTomohiro Misono struct btrfs_path *path; 189123d0b79dSTomohiro Misono struct btrfs_key key, key2; 189223d0b79dSTomohiro Misono struct extent_buffer *leaf; 189323d0b79dSTomohiro Misono struct inode *temp_inode; 189423d0b79dSTomohiro Misono char *ptr; 189523d0b79dSTomohiro Misono int slot; 189623d0b79dSTomohiro Misono int len; 189723d0b79dSTomohiro Misono int total_len = 0; 189823d0b79dSTomohiro Misono int ret; 189923d0b79dSTomohiro Misono 190023d0b79dSTomohiro Misono path = btrfs_alloc_path(); 190123d0b79dSTomohiro Misono if (!path) 190223d0b79dSTomohiro Misono return -ENOMEM; 190323d0b79dSTomohiro Misono 190423d0b79dSTomohiro Misono /* 190523d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 190623d0b79dSTomohiro Misono * construct the path in from the bottom up. 190723d0b79dSTomohiro Misono */ 190823d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 190923d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 191023d0b79dSTomohiro Misono 191156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 191223d0b79dSTomohiro Misono if (IS_ERR(root)) { 191323d0b79dSTomohiro Misono ret = PTR_ERR(root); 191423d0b79dSTomohiro Misono goto out; 191523d0b79dSTomohiro Misono } 191623d0b79dSTomohiro Misono 191723d0b79dSTomohiro Misono key.objectid = dirid; 191823d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 191923d0b79dSTomohiro Misono key.offset = (u64)-1; 192023d0b79dSTomohiro Misono while (1) { 19210ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 19220ff40a91SMarcos Paulo de Souza if (ret < 0) 1923b8a49ae1SJosef Bacik goto out_put; 19240ff40a91SMarcos Paulo de Souza else if (ret > 0) { 192523d0b79dSTomohiro Misono ret = -ENOENT; 1926b8a49ae1SJosef Bacik goto out_put; 192723d0b79dSTomohiro Misono } 192823d0b79dSTomohiro Misono 192923d0b79dSTomohiro Misono leaf = path->nodes[0]; 193023d0b79dSTomohiro Misono slot = path->slots[0]; 193123d0b79dSTomohiro Misono 193223d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 193323d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 193423d0b79dSTomohiro Misono ptr -= len + 1; 193523d0b79dSTomohiro Misono total_len += len + 1; 193623d0b79dSTomohiro Misono if (ptr < args->path) { 193723d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 1938b8a49ae1SJosef Bacik goto out_put; 193923d0b79dSTomohiro Misono } 194023d0b79dSTomohiro Misono 194123d0b79dSTomohiro Misono *(ptr + len) = '/'; 194223d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 194323d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 194423d0b79dSTomohiro Misono 194523d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 194623d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 194723d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 194823d0b79dSTomohiro Misono if (ret < 0) { 1949b8a49ae1SJosef Bacik goto out_put; 195023d0b79dSTomohiro Misono } else if (ret > 0) { 195123d0b79dSTomohiro Misono ret = -ENOENT; 1952b8a49ae1SJosef Bacik goto out_put; 195323d0b79dSTomohiro Misono } 195423d0b79dSTomohiro Misono 195523d0b79dSTomohiro Misono leaf = path->nodes[0]; 195623d0b79dSTomohiro Misono slot = path->slots[0]; 195723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 195823d0b79dSTomohiro Misono if (key2.objectid != dirid) { 195923d0b79dSTomohiro Misono ret = -ENOENT; 1960b8a49ae1SJosef Bacik goto out_put; 196123d0b79dSTomohiro Misono } 196223d0b79dSTomohiro Misono 19630202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 19643ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 19653ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 1966b8a49ae1SJosef Bacik goto out_put; 19673ca57bd6SMisono Tomohiro } 1968*4609e1f1SChristian Brauner ret = inode_permission(idmap, temp_inode, 196947291baaSChristian Brauner MAY_READ | MAY_EXEC); 197023d0b79dSTomohiro Misono iput(temp_inode); 197123d0b79dSTomohiro Misono if (ret) { 197223d0b79dSTomohiro Misono ret = -EACCES; 1973b8a49ae1SJosef Bacik goto out_put; 197423d0b79dSTomohiro Misono } 197523d0b79dSTomohiro Misono 197623d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 197723d0b79dSTomohiro Misono break; 197823d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 197923d0b79dSTomohiro Misono ret = -EACCES; 1980b8a49ae1SJosef Bacik goto out_put; 198123d0b79dSTomohiro Misono } 198223d0b79dSTomohiro Misono 198323d0b79dSTomohiro Misono btrfs_release_path(path); 198423d0b79dSTomohiro Misono key.objectid = key.offset; 198523d0b79dSTomohiro Misono key.offset = (u64)-1; 198623d0b79dSTomohiro Misono dirid = key.objectid; 198723d0b79dSTomohiro Misono } 198823d0b79dSTomohiro Misono 198923d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 199023d0b79dSTomohiro Misono args->path[total_len] = '\0'; 199100246528SJosef Bacik btrfs_put_root(root); 1992b8a49ae1SJosef Bacik root = NULL; 199323d0b79dSTomohiro Misono btrfs_release_path(path); 199423d0b79dSTomohiro Misono } 199523d0b79dSTomohiro Misono 199623d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 199723d0b79dSTomohiro Misono key.objectid = treeid; 199823d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 199923d0b79dSTomohiro Misono key.offset = args->treeid; 2000b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 200123d0b79dSTomohiro Misono if (ret < 0) { 200223d0b79dSTomohiro Misono goto out; 200323d0b79dSTomohiro Misono } else if (ret > 0) { 200423d0b79dSTomohiro Misono ret = -ENOENT; 200523d0b79dSTomohiro Misono goto out; 200623d0b79dSTomohiro Misono } 200723d0b79dSTomohiro Misono 200823d0b79dSTomohiro Misono leaf = path->nodes[0]; 200923d0b79dSTomohiro Misono slot = path->slots[0]; 201023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 201123d0b79dSTomohiro Misono 201223d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 20133212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 201423d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 201523d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 201623d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 201723d0b79dSTomohiro Misono ret = -EINVAL; 201823d0b79dSTomohiro Misono goto out; 201923d0b79dSTomohiro Misono } 202023d0b79dSTomohiro Misono 202123d0b79dSTomohiro Misono /* Copy subvolume's name */ 202223d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 202323d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 202423d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 202523d0b79dSTomohiro Misono args->name[item_len] = 0; 202623d0b79dSTomohiro Misono 2027b8a49ae1SJosef Bacik out_put: 202800246528SJosef Bacik btrfs_put_root(root); 202923d0b79dSTomohiro Misono out: 203023d0b79dSTomohiro Misono btrfs_free_path(path); 203123d0b79dSTomohiro Misono return ret; 203223d0b79dSTomohiro Misono } 203323d0b79dSTomohiro Misono 2034dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2035ac8e9819SChris Mason void __user *argp) 2036ac8e9819SChris Mason { 2037ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 203801b810b8SDavid Sterba int ret = 0; 2039ac8e9819SChris Mason 20402354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20412354d08fSJulia Lawall if (IS_ERR(args)) 20422354d08fSJulia Lawall return PTR_ERR(args); 2043c2b96929SDan Carpenter 204401b810b8SDavid Sterba /* 204501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 204601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 204701b810b8SDavid Sterba */ 20481b53ac4dSChris Mason if (args->treeid == 0) 2049dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 20501b53ac4dSChris Mason 205101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 205201b810b8SDavid Sterba args->name[0] = 0; 205301b810b8SDavid Sterba goto out; 205401b810b8SDavid Sterba } 205501b810b8SDavid Sterba 205601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 205701b810b8SDavid Sterba ret = -EPERM; 205801b810b8SDavid Sterba goto out; 205901b810b8SDavid Sterba } 206001b810b8SDavid Sterba 2061dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2062ac8e9819SChris Mason args->treeid, args->objectid, 2063ac8e9819SChris Mason args->name); 2064ac8e9819SChris Mason 206501b810b8SDavid Sterba out: 2066ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2067ac8e9819SChris Mason ret = -EFAULT; 2068ac8e9819SChris Mason 2069ac8e9819SChris Mason kfree(args); 207098d377a0STARUISI Hiroaki return ret; 207198d377a0STARUISI Hiroaki } 207298d377a0STARUISI Hiroaki 207323d0b79dSTomohiro Misono /* 207423d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 207523d0b79dSTomohiro Misono * 207623d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 207723d0b79dSTomohiro Misono * 207823d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 207923d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 208023d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 208123d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 208223d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 208323d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 208423d0b79dSTomohiro Misono */ 208523d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 208623d0b79dSTomohiro Misono { 208723d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 208823d0b79dSTomohiro Misono struct inode *inode; 208923d0b79dSTomohiro Misono int ret; 209023d0b79dSTomohiro Misono 209123d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 209223d0b79dSTomohiro Misono if (IS_ERR(args)) 209323d0b79dSTomohiro Misono return PTR_ERR(args); 209423d0b79dSTomohiro Misono 209523d0b79dSTomohiro Misono inode = file_inode(file); 209623d0b79dSTomohiro Misono 209723d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 209823d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 209923d0b79dSTomohiro Misono /* 210023d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 210123d0b79dSTomohiro Misono * called 210223d0b79dSTomohiro Misono */ 210323d0b79dSTomohiro Misono kfree(args); 210423d0b79dSTomohiro Misono return -EACCES; 210523d0b79dSTomohiro Misono } 210623d0b79dSTomohiro Misono 2107*4609e1f1SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args); 210823d0b79dSTomohiro Misono 210923d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 211023d0b79dSTomohiro Misono ret = -EFAULT; 211123d0b79dSTomohiro Misono 211223d0b79dSTomohiro Misono kfree(args); 211323d0b79dSTomohiro Misono return ret; 211423d0b79dSTomohiro Misono } 211523d0b79dSTomohiro Misono 2116b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 21179ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2118b64ec075STomohiro Misono { 2119b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2120b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2121b64ec075STomohiro Misono struct btrfs_root *root; 2122b64ec075STomohiro Misono struct btrfs_path *path; 2123b64ec075STomohiro Misono struct btrfs_key key; 2124b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2125b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2126b64ec075STomohiro Misono struct extent_buffer *leaf; 2127b64ec075STomohiro Misono unsigned long item_off; 2128b64ec075STomohiro Misono unsigned long item_len; 2129b64ec075STomohiro Misono int slot; 2130b64ec075STomohiro Misono int ret = 0; 2131b64ec075STomohiro Misono 2132b64ec075STomohiro Misono path = btrfs_alloc_path(); 2133b64ec075STomohiro Misono if (!path) 2134b64ec075STomohiro Misono return -ENOMEM; 2135b64ec075STomohiro Misono 2136b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2137b64ec075STomohiro Misono if (!subvol_info) { 2138b64ec075STomohiro Misono btrfs_free_path(path); 2139b64ec075STomohiro Misono return -ENOMEM; 2140b64ec075STomohiro Misono } 2141b64ec075STomohiro Misono 2142b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2143b64ec075STomohiro Misono 2144b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2145b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 214656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2147b64ec075STomohiro Misono if (IS_ERR(root)) { 2148b64ec075STomohiro Misono ret = PTR_ERR(root); 214904734e84SJosef Bacik goto out_free; 215004734e84SJosef Bacik } 2151b64ec075STomohiro Misono root_item = &root->root_item; 2152b64ec075STomohiro Misono 2153b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2154b64ec075STomohiro Misono 2155b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2156b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2157b64ec075STomohiro Misono 2158b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2159b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2160b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2161b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2162b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2163b64ec075STomohiro Misono 2164b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2165b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2166b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2167b64ec075STomohiro Misono 2168b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2169b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2170b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2171b64ec075STomohiro Misono 2172b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2173b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2174b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2175b64ec075STomohiro Misono 2176b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2177b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2178b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2179b64ec075STomohiro Misono 2180b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2181b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2182b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2183b64ec075STomohiro Misono key.offset = 0; 218404734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2185b64ec075STomohiro Misono if (ret < 0) { 2186b64ec075STomohiro Misono goto out; 2187b64ec075STomohiro Misono } else if (path->slots[0] >= 2188b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 218904734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2190b64ec075STomohiro Misono if (ret < 0) { 2191b64ec075STomohiro Misono goto out; 2192b64ec075STomohiro Misono } else if (ret > 0) { 2193b64ec075STomohiro Misono ret = -EUCLEAN; 2194b64ec075STomohiro Misono goto out; 2195b64ec075STomohiro Misono } 2196b64ec075STomohiro Misono } 2197b64ec075STomohiro Misono 2198b64ec075STomohiro Misono leaf = path->nodes[0]; 2199b64ec075STomohiro Misono slot = path->slots[0]; 2200b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2201b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2202b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2203b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2204b64ec075STomohiro Misono 2205b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2206b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2207b64ec075STomohiro Misono 2208b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2209b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 22103212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 2211b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2212b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2213b64ec075STomohiro Misono item_off, item_len); 2214b64ec075STomohiro Misono } else { 2215b64ec075STomohiro Misono ret = -ENOENT; 2216b64ec075STomohiro Misono goto out; 2217b64ec075STomohiro Misono } 2218b64ec075STomohiro Misono } 2219b64ec075STomohiro Misono 2220013c1c55SAnand Jain btrfs_free_path(path); 2221013c1c55SAnand Jain path = NULL; 2222b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2223b64ec075STomohiro Misono ret = -EFAULT; 2224b64ec075STomohiro Misono 2225b64ec075STomohiro Misono out: 222600246528SJosef Bacik btrfs_put_root(root); 222704734e84SJosef Bacik out_free: 2228b64ec075STomohiro Misono btrfs_free_path(path); 2229b091f7feSWaiman Long kfree(subvol_info); 2230b64ec075STomohiro Misono return ret; 2231b64ec075STomohiro Misono } 2232b64ec075STomohiro Misono 223342e4b520STomohiro Misono /* 223442e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 223542e4b520STomohiro Misono * except the subvolume name. 223642e4b520STomohiro Misono */ 22379ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 2238dc408ccdSSahil Kang void __user *argp) 223942e4b520STomohiro Misono { 224042e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 224142e4b520STomohiro Misono struct btrfs_root_ref *rref; 224242e4b520STomohiro Misono struct btrfs_path *path; 224342e4b520STomohiro Misono struct btrfs_key key; 224442e4b520STomohiro Misono struct extent_buffer *leaf; 224542e4b520STomohiro Misono u64 objectid; 224642e4b520STomohiro Misono int slot; 224742e4b520STomohiro Misono int ret; 224842e4b520STomohiro Misono u8 found; 224942e4b520STomohiro Misono 225042e4b520STomohiro Misono path = btrfs_alloc_path(); 225142e4b520STomohiro Misono if (!path) 225242e4b520STomohiro Misono return -ENOMEM; 225342e4b520STomohiro Misono 225442e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 225542e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 225642e4b520STomohiro Misono btrfs_free_path(path); 225742e4b520STomohiro Misono return PTR_ERR(rootrefs); 225842e4b520STomohiro Misono } 225942e4b520STomohiro Misono 22609ad12305SSahil Kang objectid = root->root_key.objectid; 226142e4b520STomohiro Misono key.objectid = objectid; 226242e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 226342e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 226442e4b520STomohiro Misono found = 0; 226542e4b520STomohiro Misono 22669ad12305SSahil Kang root = root->fs_info->tree_root; 226742e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 226842e4b520STomohiro Misono if (ret < 0) { 226942e4b520STomohiro Misono goto out; 227042e4b520STomohiro Misono } else if (path->slots[0] >= 227142e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 227242e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 227342e4b520STomohiro Misono if (ret < 0) { 227442e4b520STomohiro Misono goto out; 227542e4b520STomohiro Misono } else if (ret > 0) { 227642e4b520STomohiro Misono ret = -EUCLEAN; 227742e4b520STomohiro Misono goto out; 227842e4b520STomohiro Misono } 227942e4b520STomohiro Misono } 228042e4b520STomohiro Misono while (1) { 228142e4b520STomohiro Misono leaf = path->nodes[0]; 228242e4b520STomohiro Misono slot = path->slots[0]; 228342e4b520STomohiro Misono 228442e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 228542e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 228642e4b520STomohiro Misono ret = 0; 228742e4b520STomohiro Misono goto out; 228842e4b520STomohiro Misono } 228942e4b520STomohiro Misono 229042e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 229142e4b520STomohiro Misono ret = -EOVERFLOW; 229242e4b520STomohiro Misono goto out; 229342e4b520STomohiro Misono } 229442e4b520STomohiro Misono 229542e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 229642e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 229742e4b520STomohiro Misono rootrefs->rootref[found].dirid = 229842e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 229942e4b520STomohiro Misono found++; 230042e4b520STomohiro Misono 230142e4b520STomohiro Misono ret = btrfs_next_item(root, path); 230242e4b520STomohiro Misono if (ret < 0) { 230342e4b520STomohiro Misono goto out; 230442e4b520STomohiro Misono } else if (ret > 0) { 230542e4b520STomohiro Misono ret = -EUCLEAN; 230642e4b520STomohiro Misono goto out; 230742e4b520STomohiro Misono } 230842e4b520STomohiro Misono } 230942e4b520STomohiro Misono 231042e4b520STomohiro Misono out: 2311b740d806SJosef Bacik btrfs_free_path(path); 2312b740d806SJosef Bacik 231342e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 231442e4b520STomohiro Misono rootrefs->num_items = found; 231542e4b520STomohiro Misono /* update min_treeid for next search */ 231642e4b520STomohiro Misono if (found) 231742e4b520STomohiro Misono rootrefs->min_treeid = 231842e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 231942e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 232042e4b520STomohiro Misono ret = -EFAULT; 232142e4b520STomohiro Misono } 232242e4b520STomohiro Misono 232342e4b520STomohiro Misono kfree(rootrefs); 232442e4b520STomohiro Misono 232542e4b520STomohiro Misono return ret; 232642e4b520STomohiro Misono } 232742e4b520STomohiro Misono 232876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2329949964c9SMarcos Paulo de Souza void __user *arg, 2330949964c9SMarcos Paulo de Souza bool destroy_v2) 233176dda93cSYan, Zheng { 233254563d41SAl Viro struct dentry *parent = file->f_path.dentry; 23330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 233476dda93cSYan, Zheng struct dentry *dentry; 23352b0143b5SDavid Howells struct inode *dir = d_inode(parent); 233676dda93cSYan, Zheng struct inode *inode; 233776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 233876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2339949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2340949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2341*4609e1f1SChristian Brauner struct mnt_idmap *idmap = file_mnt_idmap(file); 2342949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2343949964c9SMarcos Paulo de Souza int subvol_namelen; 234476dda93cSYan, Zheng int err = 0; 2345949964c9SMarcos Paulo de Souza bool destroy_parent = false; 234676dda93cSYan, Zheng 2347813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 2348813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2349813febdbSJosef Bacik btrfs_err(fs_info, 2350813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 2351813febdbSJosef Bacik return -EOPNOTSUPP; 2352813febdbSJosef Bacik } 2353813febdbSJosef Bacik 2354949964c9SMarcos Paulo de Souza if (destroy_v2) { 2355949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2356949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2357949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2358325c50e3SJeff Mahoney 2359949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2360949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2361949964c9SMarcos Paulo de Souza goto out; 2362949964c9SMarcos Paulo de Souza } 236376dda93cSYan, Zheng 2364949964c9SMarcos Paulo de Souza /* 2365949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2366949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2367949964c9SMarcos Paulo de Souza */ 2368949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2369949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2370949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2371949964c9SMarcos Paulo de Souza 2372949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2373949964c9SMarcos Paulo de Souza if (err) 2374949964c9SMarcos Paulo de Souza goto out; 2375949964c9SMarcos Paulo de Souza } else { 2376aabb34e7SChristian Brauner struct inode *old_dir; 2377c4ed533bSChristian Brauner 2378949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 237976dda93cSYan, Zheng err = -EINVAL; 238076dda93cSYan, Zheng goto out; 238176dda93cSYan, Zheng } 238276dda93cSYan, Zheng 2383a561be71SAl Viro err = mnt_want_write_file(file); 238476dda93cSYan, Zheng if (err) 238576dda93cSYan, Zheng goto out; 238676dda93cSYan, Zheng 2387949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2388949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2389b307f06dSDavid Sterba vol_args2->subvolid, 0); 2390949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2391949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2392949964c9SMarcos Paulo de Souza goto out_drop_write; 2393949964c9SMarcos Paulo de Souza } 2394949964c9SMarcos Paulo de Souza 2395949964c9SMarcos Paulo de Souza /* 2396949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2397949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2398949964c9SMarcos Paulo de Souza */ 2399949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2400949964c9SMarcos Paulo de Souza 2401949964c9SMarcos Paulo de Souza /* 2402949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2403949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2404949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2405949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2406949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2407949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2408949964c9SMarcos Paulo de Souza */ 2409949964c9SMarcos Paulo de Souza dput(dentry); 2410949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2411949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2412949964c9SMarcos Paulo de Souza goto out_drop_write; 2413949964c9SMarcos Paulo de Souza } 2414aabb34e7SChristian Brauner old_dir = dir; 2415949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2416949964c9SMarcos Paulo de Souza 2417949964c9SMarcos Paulo de Souza /* 2418949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2419949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2420949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2421949964c9SMarcos Paulo de Souza * new parent dentry. 2422949964c9SMarcos Paulo de Souza */ 2423949964c9SMarcos Paulo de Souza destroy_parent = true; 2424949964c9SMarcos Paulo de Souza 2425aabb34e7SChristian Brauner /* 2426aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 2427aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 2428aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 2429aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 2430aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 2431aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 2432aabb34e7SChristian Brauner * to delete without an idmapped mount. 2433aabb34e7SChristian Brauner */ 2434*4609e1f1SChristian Brauner if (old_dir != dir && idmap != &nop_mnt_idmap) { 2435aabb34e7SChristian Brauner err = -EOPNOTSUPP; 2436aabb34e7SChristian Brauner goto free_parent; 2437aabb34e7SChristian Brauner } 2438aabb34e7SChristian Brauner 2439949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2440949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2441949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2442949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2443949964c9SMarcos Paulo de Souza goto free_parent; 2444949964c9SMarcos Paulo de Souza } 24451a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 2446949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2447949964c9SMarcos Paulo de Souza } 2448949964c9SMarcos Paulo de Souza } else { 2449949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2450949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2451949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2452949964c9SMarcos Paulo de Souza 2453949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2454949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2455949964c9SMarcos Paulo de Souza 2456949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2457949964c9SMarcos Paulo de Souza if (err) 2458949964c9SMarcos Paulo de Souza goto out; 2459949964c9SMarcos Paulo de Souza } 2460949964c9SMarcos Paulo de Souza 2461949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2462949964c9SMarcos Paulo de Souza 2463949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2464949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2465949964c9SMarcos Paulo de Souza err = -EINVAL; 2466949964c9SMarcos Paulo de Souza goto free_subvol_name; 2467949964c9SMarcos Paulo de Souza } 2468949964c9SMarcos Paulo de Souza 2469949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2470949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2471949964c9SMarcos Paulo de Souza goto free_subvol_name; 2472949964c9SMarcos Paulo de Souza } 2473521e0546SDavid Sterba 247400235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 247500235411SAl Viro if (err == -EINTR) 2476949964c9SMarcos Paulo de Souza goto free_subvol_name; 2477*4609e1f1SChristian Brauner dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen); 247876dda93cSYan, Zheng if (IS_ERR(dentry)) { 247976dda93cSYan, Zheng err = PTR_ERR(dentry); 248076dda93cSYan, Zheng goto out_unlock_dir; 248176dda93cSYan, Zheng } 248276dda93cSYan, Zheng 24832b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 248476dda93cSYan, Zheng err = -ENOENT; 248576dda93cSYan, Zheng goto out_dput; 248676dda93cSYan, Zheng } 248776dda93cSYan, Zheng 24882b0143b5SDavid Howells inode = d_inode(dentry); 24894260f7c7SSage Weil dest = BTRFS_I(inode)->root; 24904260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 24914260f7c7SSage Weil /* 24924260f7c7SSage Weil * Regular user. Only allow this with a special mount 24934260f7c7SSage Weil * option, when the user has write+exec access to the 24944260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 24954260f7c7SSage Weil * allowed. 24964260f7c7SSage Weil * 24974260f7c7SSage Weil * Note that this is _not_ check that the subvol is 24984260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 24994260f7c7SSage Weil * otherwise be able to delete. 25004260f7c7SSage Weil * 25014260f7c7SSage Weil * Users who want to delete empty subvols should try 25024260f7c7SSage Weil * rmdir(2). 25034260f7c7SSage Weil */ 25044260f7c7SSage Weil err = -EPERM; 25050b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 25064260f7c7SSage Weil goto out_dput; 25074260f7c7SSage Weil 25084260f7c7SSage Weil /* 25094260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 25104260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 25114260f7c7SSage Weil * must be called on the dentry referencing the root 25124260f7c7SSage Weil * of the subvol, not a random directory contained 25134260f7c7SSage Weil * within it. 25144260f7c7SSage Weil */ 25154260f7c7SSage Weil err = -EINVAL; 25164260f7c7SSage Weil if (root == dest) 25174260f7c7SSage Weil goto out_dput; 25184260f7c7SSage Weil 2519*4609e1f1SChristian Brauner err = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC); 25204260f7c7SSage Weil if (err) 25214260f7c7SSage Weil goto out_dput; 25225c39da5bSMiao Xie } 25234260f7c7SSage Weil 25245c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 2525*4609e1f1SChristian Brauner err = btrfs_may_delete(idmap, dir, dentry, 1); 25264260f7c7SSage Weil if (err) 25274260f7c7SSage Weil goto out_dput; 25284260f7c7SSage Weil 25294a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 253076dda93cSYan, Zheng err = -EINVAL; 253176dda93cSYan, Zheng goto out_dput; 253276dda93cSYan, Zheng } 253376dda93cSYan, Zheng 253429b6352bSDavid Sterba btrfs_inode_lock(BTRFS_I(inode), 0); 25353c4f91e2SDavid Sterba err = btrfs_delete_subvolume(BTRFS_I(dir), dentry); 2536e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(inode), 0); 2537a37d9a17SAmir Goldstein if (!err) 2538a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 2539fa6ac876SLiu Bo 254076dda93cSYan, Zheng out_dput: 254176dda93cSYan, Zheng dput(dentry); 254276dda93cSYan, Zheng out_unlock_dir: 2543e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(dir), 0); 2544949964c9SMarcos Paulo de Souza free_subvol_name: 2545949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 2546949964c9SMarcos Paulo de Souza free_parent: 2547949964c9SMarcos Paulo de Souza if (destroy_parent) 2548949964c9SMarcos Paulo de Souza dput(parent); 254900235411SAl Viro out_drop_write: 25502a79f17eSAl Viro mnt_drop_write_file(file); 255176dda93cSYan, Zheng out: 2552949964c9SMarcos Paulo de Souza kfree(vol_args2); 255376dda93cSYan, Zheng kfree(vol_args); 255476dda93cSYan, Zheng return err; 255576dda93cSYan, Zheng } 255676dda93cSYan, Zheng 25571e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2558f46b5a66SChristoph Hellwig { 2559496ad9aaSAl Viro struct inode *inode = file_inode(file); 2560f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2561c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 2562c146afadSYan Zheng int ret; 2563c146afadSYan Zheng 256425122d15SIlya Dryomov ret = mnt_want_write_file(file); 256525122d15SIlya Dryomov if (ret) 256625122d15SIlya Dryomov return ret; 2567b83cc969SLi Zefan 256825122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 256925122d15SIlya Dryomov ret = -EROFS; 257025122d15SIlya Dryomov goto out; 25715ac00addSStefan Behrens } 2572f46b5a66SChristoph Hellwig 2573f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2574f46b5a66SChristoph Hellwig case S_IFDIR: 2575e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2576e441d54dSChris Mason ret = -EPERM; 2577e441d54dSChris Mason goto out; 2578e441d54dSChris Mason } 2579de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 2580f46b5a66SChristoph Hellwig break; 2581f46b5a66SChristoph Hellwig case S_IFREG: 2582616d374eSAdam Borowski /* 2583616d374eSAdam Borowski * Note that this does not check the file descriptor for write 2584616d374eSAdam Borowski * access. This prevents defragmenting executables that are 2585616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 2586616d374eSAdam Borowski */ 2587616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 2588*4609e1f1SChristian Brauner inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) { 2589616d374eSAdam Borowski ret = -EPERM; 2590e441d54dSChris Mason goto out; 2591e441d54dSChris Mason } 25921e701a32SChris Mason 25931e701a32SChris Mason if (argp) { 2594c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 25951e701a32SChris Mason ret = -EFAULT; 2596683be16eSDan Carpenter goto out; 25971e701a32SChris Mason } 25981e701a32SChris Mason /* compression requires us to start the IO */ 2599c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 2600c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 2601c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 26021e701a32SChris Mason } 26031e701a32SChris Mason } else { 26041e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 2605c853a578SGoldwyn Rodrigues range.len = (u64)-1; 26061e701a32SChris Mason } 26071ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 2608c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 26094cb5300bSChris Mason if (ret > 0) 26104cb5300bSChris Mason ret = 0; 2611f46b5a66SChristoph Hellwig break; 26128929ecfaSYan, Zheng default: 26138929ecfaSYan, Zheng ret = -EINVAL; 2614f46b5a66SChristoph Hellwig } 2615e441d54dSChris Mason out: 261625122d15SIlya Dryomov mnt_drop_write_file(file); 2617e441d54dSChris Mason return ret; 2618f46b5a66SChristoph Hellwig } 2619f46b5a66SChristoph Hellwig 26202ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 2621f46b5a66SChristoph Hellwig { 2622f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2623a174c0a2SNikolay Borisov bool restore_op = false; 2624f46b5a66SChristoph Hellwig int ret; 2625f46b5a66SChristoph Hellwig 2626e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2627e441d54dSChris Mason return -EPERM; 2628e441d54dSChris Mason 2629914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2630914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 2631914a519bSJosef Bacik return -EINVAL; 2632914a519bSJosef Bacik } 2633914a519bSJosef Bacik 2634a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 2635a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 2636e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2637c9e9f97bSIlya Dryomov 2638a174c0a2SNikolay Borisov /* 2639a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 2640a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 2641a174c0a2SNikolay Borisov * back the paused balance 2642a174c0a2SNikolay Borisov */ 2643a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 2644a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 2645a174c0a2SNikolay Borisov restore_op = true; 2646a174c0a2SNikolay Borisov } 2647a174c0a2SNikolay Borisov 2648dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2649c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2650c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2651c9e9f97bSIlya Dryomov goto out; 2652c9e9f97bSIlya Dryomov } 2653f46b5a66SChristoph Hellwig 26545516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 26552ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 2656f46b5a66SChristoph Hellwig 265743d20761SAnand Jain if (!ret) 26580b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 265943d20761SAnand Jain 2660f46b5a66SChristoph Hellwig kfree(vol_args); 2661c9e9f97bSIlya Dryomov out: 2662a174c0a2SNikolay Borisov if (restore_op) 2663a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 2664a174c0a2SNikolay Borisov else 2665c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2666f46b5a66SChristoph Hellwig return ret; 2667f46b5a66SChristoph Hellwig } 2668f46b5a66SChristoph Hellwig 26696b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 2670f46b5a66SChristoph Hellwig { 26711a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 26720b246afaSJeff Mahoney struct inode *inode = file_inode(file); 26730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26746b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 26753fa421deSJosef Bacik struct block_device *bdev = NULL; 26763fa421deSJosef Bacik fmode_t mode; 2677f46b5a66SChristoph Hellwig int ret; 267867ae34b6SDavid Sterba bool cancel = false; 2679f46b5a66SChristoph Hellwig 2680e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2681e441d54dSChris Mason return -EPERM; 2682e441d54dSChris Mason 2683dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2684d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 2685d815b3f2SDan Carpenter return PTR_ERR(vol_args); 2686f46b5a66SChristoph Hellwig 2687748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 2688fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 2689fd4e994bSOmar Sandoval goto out; 2690fd4e994bSOmar Sandoval } 26911a15eb72SJosef Bacik 26926b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 26931a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 26941a15eb72SJosef Bacik args.devid = vol_args->devid; 26951a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 269667ae34b6SDavid Sterba cancel = true; 26971a15eb72SJosef Bacik } else { 26981a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 26991a15eb72SJosef Bacik if (ret) 27001a15eb72SJosef Bacik goto out; 27011a15eb72SJosef Bacik } 27021a15eb72SJosef Bacik 27031a15eb72SJosef Bacik ret = mnt_want_write_file(file); 27041a15eb72SJosef Bacik if (ret) 27051a15eb72SJosef Bacik goto out; 270667ae34b6SDavid Sterba 270767ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 270867ae34b6SDavid Sterba cancel); 270967ae34b6SDavid Sterba if (ret) 27101a15eb72SJosef Bacik goto err_drop; 271167ae34b6SDavid Sterba 27121a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 27131a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 271467ae34b6SDavid Sterba 2715c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2716183860f6SAnand Jain 27176b526ed7SAnand Jain if (!ret) { 2718735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 27190b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 27206b526ed7SAnand Jain vol_args->devid); 27216b526ed7SAnand Jain else 27220b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 27236b526ed7SAnand Jain vol_args->name); 27246b526ed7SAnand Jain } 2725c47ca32dSDan Carpenter err_drop: 27264ac20c70SIlya Dryomov mnt_drop_write_file(file); 27273fa421deSJosef Bacik if (bdev) 27283fa421deSJosef Bacik blkdev_put(bdev, mode); 27291a15eb72SJosef Bacik out: 27301a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27311a15eb72SJosef Bacik kfree(vol_args); 2732f46b5a66SChristoph Hellwig return ret; 2733f46b5a66SChristoph Hellwig } 2734f46b5a66SChristoph Hellwig 2735f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2736f46b5a66SChristoph Hellwig { 27371a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 27380b246afaSJeff Mahoney struct inode *inode = file_inode(file); 27390b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2740f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 27413fa421deSJosef Bacik struct block_device *bdev = NULL; 27423fa421deSJosef Bacik fmode_t mode; 2743f46b5a66SChristoph Hellwig int ret; 274437b45995STom Rix bool cancel = false; 2745f46b5a66SChristoph Hellwig 2746f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2747f46b5a66SChristoph Hellwig return -EPERM; 2748f46b5a66SChristoph Hellwig 27491a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 27501a15eb72SJosef Bacik if (IS_ERR(vol_args)) 27511a15eb72SJosef Bacik return PTR_ERR(vol_args); 27521a15eb72SJosef Bacik 27531a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 27541a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 27551a15eb72SJosef Bacik cancel = true; 27561a15eb72SJosef Bacik } else { 27571a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 27581a15eb72SJosef Bacik if (ret) 27591a15eb72SJosef Bacik goto out; 27601a15eb72SJosef Bacik } 27611a15eb72SJosef Bacik 2762f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 2763f46b5a66SChristoph Hellwig if (ret) 27641a15eb72SJosef Bacik goto out; 2765f46b5a66SChristoph Hellwig 276667ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 276767ae34b6SDavid Sterba cancel); 276867ae34b6SDavid Sterba if (ret == 0) { 27691a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 2770f46b5a66SChristoph Hellwig if (!ret) 27710b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 2772c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 277367ae34b6SDavid Sterba } 277467ae34b6SDavid Sterba 2775f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 27763fa421deSJosef Bacik if (bdev) 27773fa421deSJosef Bacik blkdev_put(bdev, mode); 27781a15eb72SJosef Bacik out: 27791a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27801a15eb72SJosef Bacik kfree(vol_args); 2781f46b5a66SChristoph Hellwig return ret; 2782f46b5a66SChristoph Hellwig } 2783f46b5a66SChristoph Hellwig 27842ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 27852ff7e61eSJeff Mahoney void __user *arg) 2786475f6387SJan Schmidt { 2787027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2788475f6387SJan Schmidt struct btrfs_device *device; 27890b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 2790137c5418SJohannes Thumshirn u64 flags_in; 2791027ed2f0SLi Zefan int ret = 0; 2792475f6387SJan Schmidt 2793137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 2794137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 2795137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 2796137c5418SJohannes Thumshirn 2797137c5418SJohannes Thumshirn flags_in = fi_args->flags; 2798137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 2799027ed2f0SLi Zefan 2800d03262c7SDavid Sterba rcu_read_lock(); 2801027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2802475f6387SJan Schmidt 2803d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2804027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2805027ed2f0SLi Zefan fi_args->max_id = device->devid; 2806475f6387SJan Schmidt } 2807d03262c7SDavid Sterba rcu_read_unlock(); 2808475f6387SJan Schmidt 2809de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 2810bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 2811bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 2812bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 281380a773fbSDavid Sterba 2814137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 2815137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 2816137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 2817137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 2818137c5418SJohannes Thumshirn } 2819137c5418SJohannes Thumshirn 28200fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 28210fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 28220fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 28230fb408a5SJohannes Thumshirn } 28240fb408a5SJohannes Thumshirn 282549bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 282649bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 282749bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 282849bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 282949bac897SJohannes Thumshirn } 283049bac897SJohannes Thumshirn 2831027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2832027ed2f0SLi Zefan ret = -EFAULT; 2833475f6387SJan Schmidt 2834027ed2f0SLi Zefan kfree(fi_args); 2835027ed2f0SLi Zefan return ret; 2836475f6387SJan Schmidt } 2837475f6387SJan Schmidt 28382ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 28392ff7e61eSJeff Mahoney void __user *arg) 2840475f6387SJan Schmidt { 2841562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 2842475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2843475f6387SJan Schmidt struct btrfs_device *dev; 2844475f6387SJan Schmidt int ret = 0; 2845475f6387SJan Schmidt 2846475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2847475f6387SJan Schmidt if (IS_ERR(di_args)) 2848475f6387SJan Schmidt return PTR_ERR(di_args); 2849475f6387SJan Schmidt 2850562d7b15SJosef Bacik args.devid = di_args->devid; 2851dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2852562d7b15SJosef Bacik args.uuid = di_args->uuid; 2853475f6387SJan Schmidt 2854c5593ca3SDavid Sterba rcu_read_lock(); 2855562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 2856475f6387SJan Schmidt if (!dev) { 2857475f6387SJan Schmidt ret = -ENODEV; 2858475f6387SJan Schmidt goto out; 2859475f6387SJan Schmidt } 2860475f6387SJan Schmidt 2861475f6387SJan Schmidt di_args->devid = dev->devid; 28627cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 28637cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2864475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 286563d5429fSArtem Chernyshev if (dev->name) 286663d5429fSArtem Chernyshev strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); 286763d5429fSArtem Chernyshev else 286899ba55adSStefan Behrens di_args->path[0] = '\0'; 2869475f6387SJan Schmidt 2870475f6387SJan Schmidt out: 2871c5593ca3SDavid Sterba rcu_read_unlock(); 2872475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2873475f6387SJan Schmidt ret = -EFAULT; 2874475f6387SJan Schmidt 2875475f6387SJan Schmidt kfree(di_args); 2876475f6387SJan Schmidt return ret; 2877475f6387SJan Schmidt } 2878475f6387SJan Schmidt 28796ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 28806ef5ed0dSJosef Bacik { 2881496ad9aaSAl Viro struct inode *inode = file_inode(file); 28820b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 28836ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 28846ef5ed0dSJosef Bacik struct btrfs_root *new_root; 28856ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 28866ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 28872a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 28886ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 28896db75318SSweet Tea Dorminy struct fscrypt_str name = FSTR_INIT("default", 7); 28906ef5ed0dSJosef Bacik u64 objectid = 0; 28916ef5ed0dSJosef Bacik u64 dir_id; 28923c04ce01SMiao Xie int ret; 28936ef5ed0dSJosef Bacik 28946ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 28956ef5ed0dSJosef Bacik return -EPERM; 28966ef5ed0dSJosef Bacik 28973c04ce01SMiao Xie ret = mnt_want_write_file(file); 28983c04ce01SMiao Xie if (ret) 28993c04ce01SMiao Xie return ret; 29003c04ce01SMiao Xie 29013c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29023c04ce01SMiao Xie ret = -EFAULT; 29033c04ce01SMiao Xie goto out; 29043c04ce01SMiao Xie } 29056ef5ed0dSJosef Bacik 29066ef5ed0dSJosef Bacik if (!objectid) 29071cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 29086ef5ed0dSJosef Bacik 290956e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 29103c04ce01SMiao Xie if (IS_ERR(new_root)) { 29113c04ce01SMiao Xie ret = PTR_ERR(new_root); 29123c04ce01SMiao Xie goto out; 29133c04ce01SMiao Xie } 29142a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 29152a2b5d62SJosef Bacik ret = -ENOENT; 29162a2b5d62SJosef Bacik goto out_free; 29172a2b5d62SJosef Bacik } 29186ef5ed0dSJosef Bacik 29196ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29203c04ce01SMiao Xie if (!path) { 29213c04ce01SMiao Xie ret = -ENOMEM; 29222a2b5d62SJosef Bacik goto out_free; 29233c04ce01SMiao Xie } 29246ef5ed0dSJosef Bacik 29256ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 292698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29273c04ce01SMiao Xie ret = PTR_ERR(trans); 29282a2b5d62SJosef Bacik goto out_free; 29296ef5ed0dSJosef Bacik } 29306ef5ed0dSJosef Bacik 29310b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 29320b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 2933e43eec81SSweet Tea Dorminy dir_id, &name, 1); 2934cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29352a2b5d62SJosef Bacik btrfs_release_path(path); 29363a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29370b246afaSJeff Mahoney btrfs_err(fs_info, 29385d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 29393c04ce01SMiao Xie ret = -ENOENT; 29402a2b5d62SJosef Bacik goto out_free; 29416ef5ed0dSJosef Bacik } 29426ef5ed0dSJosef Bacik 29436ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29446ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29456ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29462a2b5d62SJosef Bacik btrfs_release_path(path); 29476ef5ed0dSJosef Bacik 29480b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 29493a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29502a2b5d62SJosef Bacik out_free: 295100246528SJosef Bacik btrfs_put_root(new_root); 29522a2b5d62SJosef Bacik btrfs_free_path(path); 29533c04ce01SMiao Xie out: 29543c04ce01SMiao Xie mnt_drop_write_file(file); 29553c04ce01SMiao Xie return ret; 29566ef5ed0dSJosef Bacik } 29576ef5ed0dSJosef Bacik 2958c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 2959bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2960bf5fc093SJosef Bacik { 296132da5386SDavid Sterba struct btrfs_block_group *block_group; 2962bf5fc093SJosef Bacik 2963bf5fc093SJosef Bacik space->total_bytes = 0; 2964bf5fc093SJosef Bacik space->used_bytes = 0; 2965bf5fc093SJosef Bacik space->flags = 0; 2966bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2967bf5fc093SJosef Bacik space->flags = block_group->flags; 2968b3470b5dSDavid Sterba space->total_bytes += block_group->length; 2969bf38be65SDavid Sterba space->used_bytes += block_group->used; 2970bf5fc093SJosef Bacik } 2971bf5fc093SJosef Bacik } 2972bf5fc093SJosef Bacik 29732ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 29742ff7e61eSJeff Mahoney void __user *arg) 29751406e432SJosef Bacik { 29761406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 29771406e432SJosef Bacik struct btrfs_ioctl_space_info space; 29781406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 29797fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 298013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 29811406e432SJosef Bacik struct btrfs_space_info *info; 2982315d8e98SColin Ian King static const u64 types[] = { 2983315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 2984bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2985bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2986315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 2987315d8e98SColin Ian King }; 2988bf5fc093SJosef Bacik int num_types = 4; 29897fde62bfSChris Mason int alloc_size; 29901406e432SJosef Bacik int ret = 0; 299151788b1bSDan Rosenberg u64 slot_count = 0; 2992bf5fc093SJosef Bacik int i, c; 29931406e432SJosef Bacik 29941406e432SJosef Bacik if (copy_from_user(&space_args, 29951406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 29961406e432SJosef Bacik sizeof(space_args))) 29971406e432SJosef Bacik return -EFAULT; 29981406e432SJosef Bacik 2999bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3000bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3001bf5fc093SJosef Bacik 3002bf5fc093SJosef Bacik info = NULL; 300372804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3004bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3005bf5fc093SJosef Bacik info = tmp; 3006bf5fc093SJosef Bacik break; 3007bf5fc093SJosef Bacik } 3008bf5fc093SJosef Bacik } 30091406e432SJosef Bacik 3010bf5fc093SJosef Bacik if (!info) 3011bf5fc093SJosef Bacik continue; 3012bf5fc093SJosef Bacik 3013bf5fc093SJosef Bacik down_read(&info->groups_sem); 3014bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3015bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3016bf5fc093SJosef Bacik slot_count++; 3017bf5fc093SJosef Bacik } 3018bf5fc093SJosef Bacik up_read(&info->groups_sem); 3019bf5fc093SJosef Bacik } 3020bf5fc093SJosef Bacik 302136523e95SDavid Sterba /* 302236523e95SDavid Sterba * Global block reserve, exported as a space_info 302336523e95SDavid Sterba */ 302436523e95SDavid Sterba slot_count++; 302536523e95SDavid Sterba 30267fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30277fde62bfSChris Mason if (space_args.space_slots == 0) { 30287fde62bfSChris Mason space_args.total_spaces = slot_count; 30297fde62bfSChris Mason goto out; 30307fde62bfSChris Mason } 3031bf5fc093SJosef Bacik 303251788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3033bf5fc093SJosef Bacik 30347fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3035bf5fc093SJosef Bacik 30367fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30377fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30387fde62bfSChris Mason */ 303909cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 30407fde62bfSChris Mason return -ENOMEM; 30417fde62bfSChris Mason 30427fde62bfSChris Mason space_args.total_spaces = 0; 30438d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 30447fde62bfSChris Mason if (!dest) 30457fde62bfSChris Mason return -ENOMEM; 30467fde62bfSChris Mason dest_orig = dest; 30477fde62bfSChris Mason 30487fde62bfSChris Mason /* now we have a buffer to copy into */ 3049bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3050bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3051bf5fc093SJosef Bacik 305251788b1bSDan Rosenberg if (!slot_count) 305351788b1bSDan Rosenberg break; 305451788b1bSDan Rosenberg 3055bf5fc093SJosef Bacik info = NULL; 305672804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3057bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3058bf5fc093SJosef Bacik info = tmp; 30597fde62bfSChris Mason break; 3060bf5fc093SJosef Bacik } 3061bf5fc093SJosef Bacik } 30627fde62bfSChris Mason 3063bf5fc093SJosef Bacik if (!info) 3064bf5fc093SJosef Bacik continue; 3065bf5fc093SJosef Bacik down_read(&info->groups_sem); 3066bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3067bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3068c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3069c065f5b1SSu Yue &space); 30707fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 30711406e432SJosef Bacik dest++; 30721406e432SJosef Bacik space_args.total_spaces++; 307351788b1bSDan Rosenberg slot_count--; 30741406e432SJosef Bacik } 307551788b1bSDan Rosenberg if (!slot_count) 307651788b1bSDan Rosenberg break; 3077bf5fc093SJosef Bacik } 3078bf5fc093SJosef Bacik up_read(&info->groups_sem); 3079bf5fc093SJosef Bacik } 30801406e432SJosef Bacik 308136523e95SDavid Sterba /* 308236523e95SDavid Sterba * Add global block reserve 308336523e95SDavid Sterba */ 308436523e95SDavid Sterba if (slot_count) { 30850b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 308636523e95SDavid Sterba 308736523e95SDavid Sterba spin_lock(&block_rsv->lock); 308836523e95SDavid Sterba space.total_bytes = block_rsv->size; 308936523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 309036523e95SDavid Sterba spin_unlock(&block_rsv->lock); 309136523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 309236523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 309336523e95SDavid Sterba space_args.total_spaces++; 309436523e95SDavid Sterba } 309536523e95SDavid Sterba 30962eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 30977fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 30987fde62bfSChris Mason 30997fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 31007fde62bfSChris Mason ret = -EFAULT; 31017fde62bfSChris Mason 31027fde62bfSChris Mason kfree(dest_orig); 31037fde62bfSChris Mason out: 31047fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31051406e432SJosef Bacik ret = -EFAULT; 31061406e432SJosef Bacik 31071406e432SJosef Bacik return ret; 31081406e432SJosef Bacik } 31091406e432SJosef Bacik 31109a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31119a8c28beSMiao Xie void __user *argp) 311246204592SSage Weil { 311346204592SSage Weil struct btrfs_trans_handle *trans; 311446204592SSage Weil u64 transid; 311546204592SSage Weil 3116d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3117ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3118ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 311998d5dc13STsutomu Itoh return PTR_ERR(trans); 3120ff7c1d33SMiao Xie 3121ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3122ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3123ff7c1d33SMiao Xie goto out; 3124ff7c1d33SMiao Xie } 312546204592SSage Weil transid = trans->transid; 3126fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3127ff7c1d33SMiao Xie out: 312846204592SSage Weil if (argp) 312946204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 313046204592SSage Weil return -EFAULT; 313146204592SSage Weil return 0; 313246204592SSage Weil } 313346204592SSage Weil 31342ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 31359a8c28beSMiao Xie void __user *argp) 313646204592SSage Weil { 313746204592SSage Weil u64 transid; 313846204592SSage Weil 313946204592SSage Weil if (argp) { 314046204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 314146204592SSage Weil return -EFAULT; 314246204592SSage Weil } else { 314346204592SSage Weil transid = 0; /* current trans */ 314446204592SSage Weil } 31452ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 314646204592SSage Weil } 314746204592SSage Weil 3148b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3149475f6387SJan Schmidt { 31500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3151475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3152b8e95489SMiao Xie int ret; 3153475f6387SJan Schmidt 3154475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3155475f6387SJan Schmidt return -EPERM; 3156475f6387SJan Schmidt 3157da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3158da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 3159da32c6d5SJosef Bacik return -EINVAL; 3160da32c6d5SJosef Bacik } 3161da32c6d5SJosef Bacik 3162475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3163475f6387SJan Schmidt if (IS_ERR(sa)) 3164475f6387SJan Schmidt return PTR_ERR(sa); 3165475f6387SJan Schmidt 3166b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3167b8e95489SMiao Xie ret = mnt_want_write_file(file); 3168b8e95489SMiao Xie if (ret) 3169b8e95489SMiao Xie goto out; 3170b8e95489SMiao Xie } 3171b8e95489SMiao Xie 31720b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 317363a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 317463a212abSStefan Behrens 0); 3175475f6387SJan Schmidt 31765afe6ce7SFilipe Manana /* 31775afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 31785afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 31795afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 31805afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 31815afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 31825afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 31835afe6ce7SFilipe Manana * previously (btrfs-progs does this). 31845afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 31855afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 31865afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 31875afe6ce7SFilipe Manana */ 31885afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3189475f6387SJan Schmidt ret = -EFAULT; 3190475f6387SJan Schmidt 3191b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3192b8e95489SMiao Xie mnt_drop_write_file(file); 3193b8e95489SMiao Xie out: 3194475f6387SJan Schmidt kfree(sa); 3195475f6387SJan Schmidt return ret; 3196475f6387SJan Schmidt } 3197475f6387SJan Schmidt 31982ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3199475f6387SJan Schmidt { 3200475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3201475f6387SJan Schmidt return -EPERM; 3202475f6387SJan Schmidt 32032ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3204475f6387SJan Schmidt } 3205475f6387SJan Schmidt 32062ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3207475f6387SJan Schmidt void __user *arg) 3208475f6387SJan Schmidt { 3209475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3210475f6387SJan Schmidt int ret; 3211475f6387SJan Schmidt 3212475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3213475f6387SJan Schmidt return -EPERM; 3214475f6387SJan Schmidt 3215475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3216475f6387SJan Schmidt if (IS_ERR(sa)) 3217475f6387SJan Schmidt return PTR_ERR(sa); 3218475f6387SJan Schmidt 32192ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3220475f6387SJan Schmidt 32214fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3222475f6387SJan Schmidt ret = -EFAULT; 3223475f6387SJan Schmidt 3224475f6387SJan Schmidt kfree(sa); 3225475f6387SJan Schmidt return ret; 3226475f6387SJan Schmidt } 3227475f6387SJan Schmidt 32282ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3229b27f7c0cSDavid Sterba void __user *arg) 3230c11d2c23SStefan Behrens { 3231c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3232c11d2c23SStefan Behrens int ret; 3233c11d2c23SStefan Behrens 3234c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3235c11d2c23SStefan Behrens if (IS_ERR(sa)) 3236c11d2c23SStefan Behrens return PTR_ERR(sa); 3237c11d2c23SStefan Behrens 3238b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3239b27f7c0cSDavid Sterba kfree(sa); 3240b27f7c0cSDavid Sterba return -EPERM; 3241b27f7c0cSDavid Sterba } 3242b27f7c0cSDavid Sterba 32432ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3244c11d2c23SStefan Behrens 3245eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3246c11d2c23SStefan Behrens ret = -EFAULT; 3247c11d2c23SStefan Behrens 3248c11d2c23SStefan Behrens kfree(sa); 3249c11d2c23SStefan Behrens return ret; 3250c11d2c23SStefan Behrens } 3251c11d2c23SStefan Behrens 32522ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 32532ff7e61eSJeff Mahoney void __user *arg) 32543f6bcfbdSStefan Behrens { 32553f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32563f6bcfbdSStefan Behrens int ret; 32573f6bcfbdSStefan Behrens 32583f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32593f6bcfbdSStefan Behrens return -EPERM; 32603f6bcfbdSStefan Behrens 3261914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3262914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 3263914a519bSJosef Bacik return -EINVAL; 3264914a519bSJosef Bacik } 3265914a519bSJosef Bacik 32663f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32673f6bcfbdSStefan Behrens if (IS_ERR(p)) 32683f6bcfbdSStefan Behrens return PTR_ERR(p); 32693f6bcfbdSStefan Behrens 32703f6bcfbdSStefan Behrens switch (p->cmd) { 32713f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3272bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3273adfa97cbSIlya Dryomov ret = -EROFS; 3274adfa97cbSIlya Dryomov goto out; 3275adfa97cbSIlya Dryomov } 3276c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3277e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 32783f6bcfbdSStefan Behrens } else { 32792ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3280c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 32813f6bcfbdSStefan Behrens } 32823f6bcfbdSStefan Behrens break; 32833f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 32840b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 32853f6bcfbdSStefan Behrens ret = 0; 32863f6bcfbdSStefan Behrens break; 32873f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 328817d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 328997282031SAnand Jain ret = 0; 32903f6bcfbdSStefan Behrens break; 32913f6bcfbdSStefan Behrens default: 32923f6bcfbdSStefan Behrens ret = -EINVAL; 32933f6bcfbdSStefan Behrens break; 32943f6bcfbdSStefan Behrens } 32953f6bcfbdSStefan Behrens 3296d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 32973f6bcfbdSStefan Behrens ret = -EFAULT; 3298adfa97cbSIlya Dryomov out: 32993f6bcfbdSStefan Behrens kfree(p); 33003f6bcfbdSStefan Behrens return ret; 33013f6bcfbdSStefan Behrens } 33023f6bcfbdSStefan Behrens 3303d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3304d7728c96SJan Schmidt { 3305d7728c96SJan Schmidt int ret = 0; 3306d7728c96SJan Schmidt int i; 3307740c3d22SChris Mason u64 rel_ptr; 3308d7728c96SJan Schmidt int size; 3309806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3310d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3311d7728c96SJan Schmidt struct btrfs_path *path; 3312d7728c96SJan Schmidt 331382b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3314d7728c96SJan Schmidt return -EPERM; 3315d7728c96SJan Schmidt 3316d7728c96SJan Schmidt path = btrfs_alloc_path(); 3317d7728c96SJan Schmidt if (!path) { 3318d7728c96SJan Schmidt ret = -ENOMEM; 3319d7728c96SJan Schmidt goto out; 3320d7728c96SJan Schmidt } 3321d7728c96SJan Schmidt 3322d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3323d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3324d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3325d7728c96SJan Schmidt ipa = NULL; 3326d7728c96SJan Schmidt goto out; 3327d7728c96SJan Schmidt } 3328d7728c96SJan Schmidt 3329d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3330d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3331d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3332d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3333d7728c96SJan Schmidt ipath = NULL; 3334d7728c96SJan Schmidt goto out; 3335d7728c96SJan Schmidt } 3336d7728c96SJan Schmidt 3337d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3338d7728c96SJan Schmidt if (ret < 0) 3339d7728c96SJan Schmidt goto out; 3340d7728c96SJan Schmidt 3341d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3342745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3343745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3344740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3345d7728c96SJan Schmidt } 3346d7728c96SJan Schmidt 33478cf96b40SAnand Jain btrfs_free_path(path); 33488cf96b40SAnand Jain path = NULL; 3349718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3350718dc5faSOmar Sandoval ipath->fspath, size); 3351d7728c96SJan Schmidt if (ret) { 3352d7728c96SJan Schmidt ret = -EFAULT; 3353d7728c96SJan Schmidt goto out; 3354d7728c96SJan Schmidt } 3355d7728c96SJan Schmidt 3356d7728c96SJan Schmidt out: 3357d7728c96SJan Schmidt btrfs_free_path(path); 3358d7728c96SJan Schmidt free_ipath(ipath); 3359d7728c96SJan Schmidt kfree(ipa); 3360d7728c96SJan Schmidt 3361d7728c96SJan Schmidt return ret; 3362d7728c96SJan Schmidt } 3363d7728c96SJan Schmidt 33642ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3365d24a67b2SZygo Blaxell void __user *arg, int version) 3366d7728c96SJan Schmidt { 3367d7728c96SJan Schmidt int ret = 0; 3368d7728c96SJan Schmidt int size; 3369d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3370d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3371d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3372d24a67b2SZygo Blaxell bool ignore_offset; 3373d7728c96SJan Schmidt 3374d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3375d7728c96SJan Schmidt return -EPERM; 3376d7728c96SJan Schmidt 3377d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 33787b9ea627SShailendra Verma if (IS_ERR(loi)) 33797b9ea627SShailendra Verma return PTR_ERR(loi); 3380d7728c96SJan Schmidt 3381d24a67b2SZygo Blaxell if (version == 1) { 3382d24a67b2SZygo Blaxell ignore_offset = false; 3383b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3384d24a67b2SZygo Blaxell } else { 3385d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3386d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3387d24a67b2SZygo Blaxell ret = -EINVAL; 3388d24a67b2SZygo Blaxell goto out_loi; 3389d24a67b2SZygo Blaxell } 3390d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3391d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3392d24a67b2SZygo Blaxell ret = -EINVAL; 3393d24a67b2SZygo Blaxell goto out_loi; 3394d24a67b2SZygo Blaxell } 3395d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3396b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3397d24a67b2SZygo Blaxell } 3398d24a67b2SZygo Blaxell 3399418ffb9eSAnand Jain inodes = init_data_container(size); 3400418ffb9eSAnand Jain if (IS_ERR(inodes)) { 3401418ffb9eSAnand Jain ret = PTR_ERR(inodes); 3402418ffb9eSAnand Jain goto out_loi; 3403418ffb9eSAnand Jain } 3404418ffb9eSAnand Jain 3405d7728c96SJan Schmidt path = btrfs_alloc_path(); 3406d7728c96SJan Schmidt if (!path) { 3407d7728c96SJan Schmidt ret = -ENOMEM; 3408d7728c96SJan Schmidt goto out; 3409d7728c96SJan Schmidt } 34102ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3411e3059ec0SDavid Sterba inodes, ignore_offset); 3412418ffb9eSAnand Jain btrfs_free_path(path); 3413df031f07SLiu Bo if (ret == -EINVAL) 3414d7728c96SJan Schmidt ret = -ENOENT; 3415d7728c96SJan Schmidt if (ret < 0) 3416d7728c96SJan Schmidt goto out; 3417d7728c96SJan Schmidt 3418718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3419718dc5faSOmar Sandoval size); 3420d7728c96SJan Schmidt if (ret) 3421d7728c96SJan Schmidt ret = -EFAULT; 3422d7728c96SJan Schmidt 3423d7728c96SJan Schmidt out: 3424f54de068SDavid Sterba kvfree(inodes); 3425d24a67b2SZygo Blaxell out_loi: 3426d7728c96SJan Schmidt kfree(loi); 3427d7728c96SJan Schmidt 3428d7728c96SJan Schmidt return ret; 3429d7728c96SJan Schmidt } 3430d7728c96SJan Schmidt 3431008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3432c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3433c9e9f97bSIlya Dryomov { 3434c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3435c9e9f97bSIlya Dryomov 3436c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3437c9e9f97bSIlya Dryomov 34383009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3439837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3440837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3441837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3442a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3443a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3444837d5b6eSIlya Dryomov 3445c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3446c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3447c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 344819a39dceSIlya Dryomov 344919a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 345019a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 345119a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3452c9e9f97bSIlya Dryomov } 3453c9e9f97bSIlya Dryomov 345443dd529aSDavid Sterba /* 34557fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 34567fb10ed8SNikolay Borisov * required. 34577fb10ed8SNikolay Borisov * 34587fb10ed8SNikolay Borisov * @fs_info: the filesystem 34597fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 34607fb10ed8SNikolay Borisov * is being resumed 34617fb10ed8SNikolay Borisov * 34627fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 34637fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 34647fb10ed8SNikolay Borisov */ 34657fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 34667fb10ed8SNikolay Borisov { 34677fb10ed8SNikolay Borisov int ret; 34687fb10ed8SNikolay Borisov 34697fb10ed8SNikolay Borisov /* 34707fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 34717fb10ed8SNikolay Borisov * (1) some other op is running 34727fb10ed8SNikolay Borisov * (2) balance is running 34737fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 34747fb10ed8SNikolay Borisov */ 34757fb10ed8SNikolay Borisov while (1) { 34767fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 34777fb10ed8SNikolay Borisov *excl_acquired = true; 34787fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34797fb10ed8SNikolay Borisov return 0; 34807fb10ed8SNikolay Borisov } 34817fb10ed8SNikolay Borisov 34827fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34837fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 34847fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 34857fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 34867fb10ed8SNikolay Borisov /* This is (2) */ 34877fb10ed8SNikolay Borisov ret = -EINPROGRESS; 34887fb10ed8SNikolay Borisov goto out_failure; 34897fb10ed8SNikolay Borisov 34907fb10ed8SNikolay Borisov } else { 34917fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 34927fb10ed8SNikolay Borisov /* 34937fb10ed8SNikolay Borisov * Lock released to allow other waiters to 34947fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 34957fb10ed8SNikolay Borisov */ 34967fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34977fb10ed8SNikolay Borisov 34987fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 34997fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 35007fb10ed8SNikolay Borisov /* This is (3) */ 35017fb10ed8SNikolay Borisov *excl_acquired = false; 35027fb10ed8SNikolay Borisov return 0; 35037fb10ed8SNikolay Borisov } 35047fb10ed8SNikolay Borisov } 35057fb10ed8SNikolay Borisov } else { 35067fb10ed8SNikolay Borisov /* This is (1) */ 35077fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 35087fb10ed8SNikolay Borisov goto out_failure; 35097fb10ed8SNikolay Borisov } 35107fb10ed8SNikolay Borisov 35117fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35127fb10ed8SNikolay Borisov } 35137fb10ed8SNikolay Borisov 35147fb10ed8SNikolay Borisov out_failure: 35157fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35167fb10ed8SNikolay Borisov *excl_acquired = false; 35177fb10ed8SNikolay Borisov return ret; 35187fb10ed8SNikolay Borisov } 35197fb10ed8SNikolay Borisov 35209ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3521c9e9f97bSIlya Dryomov { 3522496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3523c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3524c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3525c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3526099aa972SNikolay Borisov bool need_unlock = true; 3527c9e9f97bSIlya Dryomov int ret; 3528c9e9f97bSIlya Dryomov 3529c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3530c9e9f97bSIlya Dryomov return -EPERM; 3531c9e9f97bSIlya Dryomov 3532e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35339ba1f6e4SLiu Bo if (ret) 35349ba1f6e4SLiu Bo return ret; 35359ba1f6e4SLiu Bo 3536d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 3537d8645462SNikolay Borisov if (IS_ERR(bargs)) { 3538d8645462SNikolay Borisov ret = PTR_ERR(bargs); 3539d8645462SNikolay Borisov bargs = NULL; 3540d8645462SNikolay Borisov goto out; 3541d8645462SNikolay Borisov } 3542d8645462SNikolay Borisov 3543099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 3544099aa972SNikolay Borisov if (ret) 3545ed0fb78fSIlya Dryomov goto out; 3546ed0fb78fSIlya Dryomov 3547099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 3548099aa972SNikolay Borisov 3549de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3550de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3551de322263SIlya Dryomov ret = -ENOTCONN; 3552d8645462SNikolay Borisov goto out_unlock; 3553de322263SIlya Dryomov } 3554de322263SIlya Dryomov 3555de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3556de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3557de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3558de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3559efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 3560de322263SIlya Dryomov 3561de322263SIlya Dryomov goto do_balance; 3562de322263SIlya Dryomov } 3563c9e9f97bSIlya Dryomov 3564d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 3565d8645462SNikolay Borisov ret = -EINVAL; 3566d8645462SNikolay Borisov goto out_unlock; 3567c9e9f97bSIlya Dryomov } 3568c9e9f97bSIlya Dryomov 3569ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3570837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3571d8645462SNikolay Borisov goto out_unlock; 3572837d5b6eSIlya Dryomov } 3573837d5b6eSIlya Dryomov 35748d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3575c9e9f97bSIlya Dryomov if (!bctl) { 3576c9e9f97bSIlya Dryomov ret = -ENOMEM; 3577d8645462SNikolay Borisov goto out_unlock; 3578c9e9f97bSIlya Dryomov } 3579c9e9f97bSIlya Dryomov 3580c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3581c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3582c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3583c9e9f97bSIlya Dryomov 3584c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3585de322263SIlya Dryomov do_balance: 3586c9e9f97bSIlya Dryomov /* 3587c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 3588c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 3589c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 3590c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 3591c9e9f97bSIlya Dryomov */ 3592ed0fb78fSIlya Dryomov need_unlock = false; 3593ed0fb78fSIlya Dryomov 35946fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 35950f89abf5SChristian Engelmayer bctl = NULL; 3596ed0fb78fSIlya Dryomov 359739864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 3598c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3599c9e9f97bSIlya Dryomov ret = -EFAULT; 3600c9e9f97bSIlya Dryomov } 3601c9e9f97bSIlya Dryomov 36020f89abf5SChristian Engelmayer kfree(bctl); 3603ed0fb78fSIlya Dryomov out_unlock: 3604c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3605ed0fb78fSIlya Dryomov if (need_unlock) 3606c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3607ed0fb78fSIlya Dryomov out: 3608e54bfa31SLiu Bo mnt_drop_write_file(file); 3609d8645462SNikolay Borisov kfree(bargs); 3610c9e9f97bSIlya Dryomov return ret; 3611c9e9f97bSIlya Dryomov } 3612c9e9f97bSIlya Dryomov 36132ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 3614837d5b6eSIlya Dryomov { 3615837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3616837d5b6eSIlya Dryomov return -EPERM; 3617837d5b6eSIlya Dryomov 3618837d5b6eSIlya Dryomov switch (cmd) { 3619837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 36200b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 3621a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 36220b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 3623837d5b6eSIlya Dryomov } 3624837d5b6eSIlya Dryomov 3625837d5b6eSIlya Dryomov return -EINVAL; 3626837d5b6eSIlya Dryomov } 3627837d5b6eSIlya Dryomov 36282ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 362919a39dceSIlya Dryomov void __user *arg) 363019a39dceSIlya Dryomov { 363119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 363219a39dceSIlya Dryomov int ret = 0; 363319a39dceSIlya Dryomov 363419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 363519a39dceSIlya Dryomov return -EPERM; 363619a39dceSIlya Dryomov 363719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 363819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 363919a39dceSIlya Dryomov ret = -ENOTCONN; 364019a39dceSIlya Dryomov goto out; 364119a39dceSIlya Dryomov } 364219a39dceSIlya Dryomov 36438d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 364419a39dceSIlya Dryomov if (!bargs) { 364519a39dceSIlya Dryomov ret = -ENOMEM; 364619a39dceSIlya Dryomov goto out; 364719a39dceSIlya Dryomov } 364819a39dceSIlya Dryomov 3649008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 365019a39dceSIlya Dryomov 365119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 365219a39dceSIlya Dryomov ret = -EFAULT; 365319a39dceSIlya Dryomov 365419a39dceSIlya Dryomov kfree(bargs); 365519a39dceSIlya Dryomov out: 365619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 365719a39dceSIlya Dryomov return ret; 365819a39dceSIlya Dryomov } 365919a39dceSIlya Dryomov 3660905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36615d13a37bSArne Jansen { 36620b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36645d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36655d13a37bSArne Jansen int ret; 36665d13a37bSArne Jansen 36675d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36685d13a37bSArne Jansen return -EPERM; 36695d13a37bSArne Jansen 3670905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3671905b0ddaSMiao Xie if (ret) 3672905b0ddaSMiao Xie return ret; 36735d13a37bSArne Jansen 36745d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3675905b0ddaSMiao Xie if (IS_ERR(sa)) { 3676905b0ddaSMiao Xie ret = PTR_ERR(sa); 3677905b0ddaSMiao Xie goto drop_write; 3678905b0ddaSMiao Xie } 36795d13a37bSArne Jansen 36800b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 36815d13a37bSArne Jansen 36825d13a37bSArne Jansen switch (sa->cmd) { 36835d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 3684340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 36855d13a37bSArne Jansen break; 36865d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 3687340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 36885d13a37bSArne Jansen break; 36895d13a37bSArne Jansen default: 36905d13a37bSArne Jansen ret = -EINVAL; 36915d13a37bSArne Jansen break; 36925d13a37bSArne Jansen } 36935d13a37bSArne Jansen 36945d13a37bSArne Jansen kfree(sa); 36950b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3696905b0ddaSMiao Xie drop_write: 3697905b0ddaSMiao Xie mnt_drop_write_file(file); 36985d13a37bSArne Jansen return ret; 36995d13a37bSArne Jansen } 37005d13a37bSArne Jansen 3701905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37025d13a37bSArne Jansen { 37030b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37040b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37050b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37065d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37075d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37085d13a37bSArne Jansen int ret; 37095d13a37bSArne Jansen int err; 37105d13a37bSArne Jansen 37115d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37125d13a37bSArne Jansen return -EPERM; 37135d13a37bSArne Jansen 3714905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3715905b0ddaSMiao Xie if (ret) 3716905b0ddaSMiao Xie return ret; 37175d13a37bSArne Jansen 37185d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3719905b0ddaSMiao Xie if (IS_ERR(sa)) { 3720905b0ddaSMiao Xie ret = PTR_ERR(sa); 3721905b0ddaSMiao Xie goto drop_write; 3722905b0ddaSMiao Xie } 37235d13a37bSArne Jansen 37245d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37255d13a37bSArne Jansen if (IS_ERR(trans)) { 37265d13a37bSArne Jansen ret = PTR_ERR(trans); 37275d13a37bSArne Jansen goto out; 37285d13a37bSArne Jansen } 37295d13a37bSArne Jansen 37305d13a37bSArne Jansen if (sa->assign) { 37319f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 37325d13a37bSArne Jansen } else { 373339616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 37345d13a37bSArne Jansen } 37355d13a37bSArne Jansen 3736e082f563SQu Wenruo /* update qgroup status and info */ 3737280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 3738e082f563SQu Wenruo if (err < 0) 37390b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 3740ad8403dfSAnand Jain "failed to update qgroup status and info"); 37413a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37425d13a37bSArne Jansen if (err && !ret) 37435d13a37bSArne Jansen ret = err; 37445d13a37bSArne Jansen 37455d13a37bSArne Jansen out: 37465d13a37bSArne Jansen kfree(sa); 3747905b0ddaSMiao Xie drop_write: 3748905b0ddaSMiao Xie mnt_drop_write_file(file); 37495d13a37bSArne Jansen return ret; 37505d13a37bSArne Jansen } 37515d13a37bSArne Jansen 3752905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37535d13a37bSArne Jansen { 37540b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37550b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37565d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37575d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37585d13a37bSArne Jansen int ret; 37595d13a37bSArne Jansen int err; 37605d13a37bSArne Jansen 37615d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37625d13a37bSArne Jansen return -EPERM; 37635d13a37bSArne Jansen 3764905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3765905b0ddaSMiao Xie if (ret) 3766905b0ddaSMiao Xie return ret; 37675d13a37bSArne Jansen 37685d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3769905b0ddaSMiao Xie if (IS_ERR(sa)) { 3770905b0ddaSMiao Xie ret = PTR_ERR(sa); 3771905b0ddaSMiao Xie goto drop_write; 3772905b0ddaSMiao Xie } 37735d13a37bSArne Jansen 3774d86e56cfSMiao Xie if (!sa->qgroupid) { 3775d86e56cfSMiao Xie ret = -EINVAL; 3776d86e56cfSMiao Xie goto out; 3777d86e56cfSMiao Xie } 3778d86e56cfSMiao Xie 37795d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37805d13a37bSArne Jansen if (IS_ERR(trans)) { 37815d13a37bSArne Jansen ret = PTR_ERR(trans); 37825d13a37bSArne Jansen goto out; 37835d13a37bSArne Jansen } 37845d13a37bSArne Jansen 37855d13a37bSArne Jansen if (sa->create) { 378649a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 37875d13a37bSArne Jansen } else { 37883efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 37895d13a37bSArne Jansen } 37905d13a37bSArne Jansen 37913a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37925d13a37bSArne Jansen if (err && !ret) 37935d13a37bSArne Jansen ret = err; 37945d13a37bSArne Jansen 37955d13a37bSArne Jansen out: 37965d13a37bSArne Jansen kfree(sa); 3797905b0ddaSMiao Xie drop_write: 3798905b0ddaSMiao Xie mnt_drop_write_file(file); 37995d13a37bSArne Jansen return ret; 38005d13a37bSArne Jansen } 38015d13a37bSArne Jansen 3802905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38035d13a37bSArne Jansen { 38040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38050b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 38065d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38075d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38085d13a37bSArne Jansen int ret; 38095d13a37bSArne Jansen int err; 38105d13a37bSArne Jansen u64 qgroupid; 38115d13a37bSArne Jansen 38125d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38135d13a37bSArne Jansen return -EPERM; 38145d13a37bSArne Jansen 3815905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3816905b0ddaSMiao Xie if (ret) 3817905b0ddaSMiao Xie return ret; 38185d13a37bSArne Jansen 38195d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3820905b0ddaSMiao Xie if (IS_ERR(sa)) { 3821905b0ddaSMiao Xie ret = PTR_ERR(sa); 3822905b0ddaSMiao Xie goto drop_write; 3823905b0ddaSMiao Xie } 38245d13a37bSArne Jansen 38255d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38265d13a37bSArne Jansen if (IS_ERR(trans)) { 38275d13a37bSArne Jansen ret = PTR_ERR(trans); 38285d13a37bSArne Jansen goto out; 38295d13a37bSArne Jansen } 38305d13a37bSArne Jansen 38315d13a37bSArne Jansen qgroupid = sa->qgroupid; 38325d13a37bSArne Jansen if (!qgroupid) { 38335d13a37bSArne Jansen /* take the current subvol as qgroup */ 38345d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38355d13a37bSArne Jansen } 38365d13a37bSArne Jansen 3837f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 38385d13a37bSArne Jansen 38393a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 38405d13a37bSArne Jansen if (err && !ret) 38415d13a37bSArne Jansen ret = err; 38425d13a37bSArne Jansen 38435d13a37bSArne Jansen out: 38445d13a37bSArne Jansen kfree(sa); 3845905b0ddaSMiao Xie drop_write: 3846905b0ddaSMiao Xie mnt_drop_write_file(file); 38475d13a37bSArne Jansen return ret; 38485d13a37bSArne Jansen } 38495d13a37bSArne Jansen 38502f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38512f232036SJan Schmidt { 38520b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38530b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 38542f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38552f232036SJan Schmidt int ret; 38562f232036SJan Schmidt 38572f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38582f232036SJan Schmidt return -EPERM; 38592f232036SJan Schmidt 38602f232036SJan Schmidt ret = mnt_want_write_file(file); 38612f232036SJan Schmidt if (ret) 38622f232036SJan Schmidt return ret; 38632f232036SJan Schmidt 38642f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38652f232036SJan Schmidt if (IS_ERR(qsa)) { 38662f232036SJan Schmidt ret = PTR_ERR(qsa); 38672f232036SJan Schmidt goto drop_write; 38682f232036SJan Schmidt } 38692f232036SJan Schmidt 38702f232036SJan Schmidt if (qsa->flags) { 38712f232036SJan Schmidt ret = -EINVAL; 38722f232036SJan Schmidt goto out; 38732f232036SJan Schmidt } 38742f232036SJan Schmidt 38750b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 38762f232036SJan Schmidt 38772f232036SJan Schmidt out: 38782f232036SJan Schmidt kfree(qsa); 38792f232036SJan Schmidt drop_write: 38802f232036SJan Schmidt mnt_drop_write_file(file); 38812f232036SJan Schmidt return ret; 38822f232036SJan Schmidt } 38832f232036SJan Schmidt 3884b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 3885b929c1d8SMarcos Paulo de Souza void __user *arg) 38862f232036SJan Schmidt { 38870afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 38882f232036SJan Schmidt 38892f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38902f232036SJan Schmidt return -EPERM; 38912f232036SJan Schmidt 38920b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 38930afb603aSGoldwyn Rodrigues qsa.flags = 1; 38940afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 38952f232036SJan Schmidt } 38962f232036SJan Schmidt 38970afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 3898991a3daeSAnand Jain return -EFAULT; 38992f232036SJan Schmidt 3900991a3daeSAnand Jain return 0; 39012f232036SJan Schmidt } 39022f232036SJan Schmidt 3903b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 3904b929c1d8SMarcos Paulo de Souza void __user *arg) 390557254b6eSJan Schmidt { 390657254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 390757254b6eSJan Schmidt return -EPERM; 390857254b6eSJan Schmidt 39090b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 391057254b6eSJan Schmidt } 391157254b6eSJan Schmidt 3912abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 3913e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 3914abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 39158ea05e3aSAlexander Block { 3916496ad9aaSAl Viro struct inode *inode = file_inode(file); 39170b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 39188ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39198ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39208ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 392195582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 39228ea05e3aSAlexander Block int ret = 0; 3923dd5f9615SStefan Behrens int received_uuid_changed; 39248ea05e3aSAlexander Block 3925e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 3926bd60ea0fSDavid Sterba return -EPERM; 3927bd60ea0fSDavid Sterba 39288ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39298ea05e3aSAlexander Block if (ret < 0) 39308ea05e3aSAlexander Block return ret; 39318ea05e3aSAlexander Block 39320b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 39338ea05e3aSAlexander Block 39344a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 39358ea05e3aSAlexander Block ret = -EINVAL; 39368ea05e3aSAlexander Block goto out; 39378ea05e3aSAlexander Block } 39388ea05e3aSAlexander Block 39398ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39408ea05e3aSAlexander Block ret = -EROFS; 39418ea05e3aSAlexander Block goto out; 39428ea05e3aSAlexander Block } 39438ea05e3aSAlexander Block 3944dd5f9615SStefan Behrens /* 3945dd5f9615SStefan Behrens * 1 - root item 3946dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 3947dd5f9615SStefan Behrens */ 3948dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 39498ea05e3aSAlexander Block if (IS_ERR(trans)) { 39508ea05e3aSAlexander Block ret = PTR_ERR(trans); 39518ea05e3aSAlexander Block trans = NULL; 39528ea05e3aSAlexander Block goto out; 39538ea05e3aSAlexander Block } 39548ea05e3aSAlexander Block 39558ea05e3aSAlexander Block sa->rtransid = trans->transid; 39568ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39578ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39588ea05e3aSAlexander Block 3959dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 3960dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 3961dd5f9615SStefan Behrens if (received_uuid_changed && 3962d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 3963d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 3964dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3965dd5f9615SStefan Behrens root->root_key.objectid); 3966d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 3967d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 3968d87ff758SNikolay Borisov btrfs_end_transaction(trans); 3969d87ff758SNikolay Borisov goto out; 3970d87ff758SNikolay Borisov } 3971d87ff758SNikolay Borisov } 39728ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39738ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 39748ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 39753cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 39763cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 39773cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 39783cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 39798ea05e3aSAlexander Block 39800b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 39818ea05e3aSAlexander Block &root->root_key, &root->root_item); 39828ea05e3aSAlexander Block if (ret < 0) { 39833a45bb20SJeff Mahoney btrfs_end_transaction(trans); 39848ea05e3aSAlexander Block goto out; 3985dd5f9615SStefan Behrens } 3986dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 3987cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 3988dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3989dd5f9615SStefan Behrens root->root_key.objectid); 3990dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 399166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 3992efd38150SNikolay Borisov btrfs_end_transaction(trans); 3993dd5f9615SStefan Behrens goto out; 3994dd5f9615SStefan Behrens } 3995dd5f9615SStefan Behrens } 39963a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 3997abccd00fSHugo Mills out: 39980b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3999abccd00fSHugo Mills mnt_drop_write_file(file); 4000abccd00fSHugo Mills return ret; 4001abccd00fSHugo Mills } 4002abccd00fSHugo Mills 4003abccd00fSHugo Mills #ifdef CONFIG_64BIT 4004abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4005abccd00fSHugo Mills void __user *arg) 4006abccd00fSHugo Mills { 4007abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4008abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4009abccd00fSHugo Mills int ret = 0; 4010abccd00fSHugo Mills 4011abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 40127b9ea627SShailendra Verma if (IS_ERR(args32)) 40137b9ea627SShailendra Verma return PTR_ERR(args32); 4014abccd00fSHugo Mills 40158d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 401684dbeb87SDan Carpenter if (!args64) { 401784dbeb87SDan Carpenter ret = -ENOMEM; 4018abccd00fSHugo Mills goto out; 4019abccd00fSHugo Mills } 4020abccd00fSHugo Mills 4021abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4022abccd00fSHugo Mills args64->stransid = args32->stransid; 4023abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4024abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4025abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4026abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4027abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4028abccd00fSHugo Mills args64->flags = args32->flags; 4029abccd00fSHugo Mills 4030e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4031abccd00fSHugo Mills if (ret) 4032abccd00fSHugo Mills goto out; 4033abccd00fSHugo Mills 4034abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4035abccd00fSHugo Mills args32->stransid = args64->stransid; 4036abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4037abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4038abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4039abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4040abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4041abccd00fSHugo Mills args32->flags = args64->flags; 4042abccd00fSHugo Mills 4043abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4044abccd00fSHugo Mills if (ret) 4045abccd00fSHugo Mills ret = -EFAULT; 4046abccd00fSHugo Mills 4047abccd00fSHugo Mills out: 4048abccd00fSHugo Mills kfree(args32); 4049abccd00fSHugo Mills kfree(args64); 4050abccd00fSHugo Mills return ret; 4051abccd00fSHugo Mills } 4052abccd00fSHugo Mills #endif 4053abccd00fSHugo Mills 4054abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4055abccd00fSHugo Mills void __user *arg) 4056abccd00fSHugo Mills { 4057abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4058abccd00fSHugo Mills int ret = 0; 4059abccd00fSHugo Mills 4060abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 40617b9ea627SShailendra Verma if (IS_ERR(sa)) 40627b9ea627SShailendra Verma return PTR_ERR(sa); 4063abccd00fSHugo Mills 4064e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4065abccd00fSHugo Mills 4066abccd00fSHugo Mills if (ret) 4067abccd00fSHugo Mills goto out; 4068abccd00fSHugo Mills 40698ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 40708ea05e3aSAlexander Block if (ret) 40718ea05e3aSAlexander Block ret = -EFAULT; 40728ea05e3aSAlexander Block 40738ea05e3aSAlexander Block out: 40748ea05e3aSAlexander Block kfree(sa); 40758ea05e3aSAlexander Block return ret; 40768ea05e3aSAlexander Block } 40778ea05e3aSAlexander Block 4078b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4079b929c1d8SMarcos Paulo de Souza void __user *arg) 4080867ab667Sjeff.liu { 4081a1b83ac5SAnand Jain size_t len; 4082867ab667Sjeff.liu int ret; 4083a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4084a1b83ac5SAnand Jain 40850b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 40860b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 40870b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4088a1b83ac5SAnand Jain 4089a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4090867ab667Sjeff.liu 4091867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 40920b246afaSJeff Mahoney btrfs_warn(fs_info, 40930b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 40940b246afaSJeff Mahoney --len); 4095867ab667Sjeff.liu } 4096867ab667Sjeff.liu 4097867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4098867ab667Sjeff.liu 4099867ab667Sjeff.liu return ret ? -EFAULT : 0; 4100867ab667Sjeff.liu } 4101867ab667Sjeff.liu 4102a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4103a8bfd4abSjeff.liu { 41040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41060b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41070b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4108a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4109a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4110a8bfd4abSjeff.liu int ret; 4111a8bfd4abSjeff.liu 4112a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4113a8bfd4abSjeff.liu return -EPERM; 4114a8bfd4abSjeff.liu 4115a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4116a8bfd4abSjeff.liu return -EFAULT; 4117a8bfd4abSjeff.liu 4118a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 41190b246afaSJeff Mahoney btrfs_err(fs_info, 41205d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4121a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4122a8bfd4abSjeff.liu return -EINVAL; 4123a8bfd4abSjeff.liu } 4124a8bfd4abSjeff.liu 4125a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4126a8bfd4abSjeff.liu if (ret) 4127a8bfd4abSjeff.liu return ret; 4128a8bfd4abSjeff.liu 4129a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4130a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4131a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4132a8bfd4abSjeff.liu goto out_unlock; 4133a8bfd4abSjeff.liu } 4134a8bfd4abSjeff.liu 41350b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4136a8bfd4abSjeff.liu strcpy(super_block->label, label); 41370b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 41383a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4139a8bfd4abSjeff.liu 4140a8bfd4abSjeff.liu out_unlock: 4141a8bfd4abSjeff.liu mnt_drop_write_file(file); 4142a8bfd4abSjeff.liu return ret; 4143a8bfd4abSjeff.liu } 4144a8bfd4abSjeff.liu 41452eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 41462eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 41472eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 41482eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 41492eaa055fSJeff Mahoney 4150d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 41512eaa055fSJeff Mahoney { 41524d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 41532eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 41542eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 41552eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 41562eaa055fSJeff Mahoney }; 41572eaa055fSJeff Mahoney 41582eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41592eaa055fSJeff Mahoney return -EFAULT; 41602eaa055fSJeff Mahoney 41612eaa055fSJeff Mahoney return 0; 41622eaa055fSJeff Mahoney } 41632eaa055fSJeff Mahoney 4164b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4165b929c1d8SMarcos Paulo de Souza void __user *arg) 41662eaa055fSJeff Mahoney { 41670b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 41682eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 41692eaa055fSJeff Mahoney 41702eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 41712eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 41722eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 41732eaa055fSJeff Mahoney 41742eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41752eaa055fSJeff Mahoney return -EFAULT; 41762eaa055fSJeff Mahoney 41772eaa055fSJeff Mahoney return 0; 41782eaa055fSJeff Mahoney } 41792eaa055fSJeff Mahoney 41802ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 41813b02a68aSJeff Mahoney enum btrfs_feature_set set, 41822eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 41832eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 41842eaa055fSJeff Mahoney { 4185f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 41863b02a68aSJeff Mahoney char *names; 41872eaa055fSJeff Mahoney u64 disallowed, unsupported; 41882eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 41892eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 41902eaa055fSJeff Mahoney 41912eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 41922eaa055fSJeff Mahoney if (unsupported) { 41933b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 41943b02a68aSJeff Mahoney if (names) { 41950b246afaSJeff Mahoney btrfs_warn(fs_info, 41963b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 41973b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 41983b02a68aSJeff Mahoney kfree(names); 41993b02a68aSJeff Mahoney } else 42000b246afaSJeff Mahoney btrfs_warn(fs_info, 42012eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 42022eaa055fSJeff Mahoney type, unsupported); 42032eaa055fSJeff Mahoney return -EOPNOTSUPP; 42042eaa055fSJeff Mahoney } 42052eaa055fSJeff Mahoney 42062eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 42072eaa055fSJeff Mahoney if (disallowed) { 42083b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42093b02a68aSJeff Mahoney if (names) { 42100b246afaSJeff Mahoney btrfs_warn(fs_info, 42113b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 42123b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42133b02a68aSJeff Mahoney kfree(names); 42143b02a68aSJeff Mahoney } else 42150b246afaSJeff Mahoney btrfs_warn(fs_info, 42162eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 42172eaa055fSJeff Mahoney type, disallowed); 42182eaa055fSJeff Mahoney return -EPERM; 42192eaa055fSJeff Mahoney } 42202eaa055fSJeff Mahoney 42212eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 42222eaa055fSJeff Mahoney if (disallowed) { 42233b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42243b02a68aSJeff Mahoney if (names) { 42250b246afaSJeff Mahoney btrfs_warn(fs_info, 42263b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 42273b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42283b02a68aSJeff Mahoney kfree(names); 42293b02a68aSJeff Mahoney } else 42300b246afaSJeff Mahoney btrfs_warn(fs_info, 42312eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 42322eaa055fSJeff Mahoney type, disallowed); 42332eaa055fSJeff Mahoney return -EPERM; 42342eaa055fSJeff Mahoney } 42352eaa055fSJeff Mahoney 42362eaa055fSJeff Mahoney return 0; 42372eaa055fSJeff Mahoney } 42382eaa055fSJeff Mahoney 42392ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 42402ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 42412eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 42422eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 42432eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 42442eaa055fSJeff Mahoney 42452eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 42462eaa055fSJeff Mahoney { 42470b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42490b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42500b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 42512eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 42522eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 42532eaa055fSJeff Mahoney u64 newflags; 42542eaa055fSJeff Mahoney int ret; 42552eaa055fSJeff Mahoney 42562eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 42572eaa055fSJeff Mahoney return -EPERM; 42582eaa055fSJeff Mahoney 42592eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 42602eaa055fSJeff Mahoney return -EFAULT; 42612eaa055fSJeff Mahoney 42622eaa055fSJeff Mahoney /* Nothing to do */ 42632eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 42642eaa055fSJeff Mahoney !flags[0].incompat_flags) 42652eaa055fSJeff Mahoney return 0; 42662eaa055fSJeff Mahoney 42672ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 42682eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 42692eaa055fSJeff Mahoney if (ret) 42702eaa055fSJeff Mahoney return ret; 42712eaa055fSJeff Mahoney 42722ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 42732eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 42742eaa055fSJeff Mahoney if (ret) 42752eaa055fSJeff Mahoney return ret; 42762eaa055fSJeff Mahoney 42772ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 42782eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 42792eaa055fSJeff Mahoney if (ret) 42802eaa055fSJeff Mahoney return ret; 42812eaa055fSJeff Mahoney 42827ab19625SDavid Sterba ret = mnt_want_write_file(file); 42837ab19625SDavid Sterba if (ret) 42847ab19625SDavid Sterba return ret; 42857ab19625SDavid Sterba 42868051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 42877ab19625SDavid Sterba if (IS_ERR(trans)) { 42887ab19625SDavid Sterba ret = PTR_ERR(trans); 42897ab19625SDavid Sterba goto out_drop_write; 42907ab19625SDavid Sterba } 42912eaa055fSJeff Mahoney 42920b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 42932eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 42942eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 42952eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 42962eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 42972eaa055fSJeff Mahoney 42982eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 42992eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 43002eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 43012eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 43022eaa055fSJeff Mahoney 43032eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 43042eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 43052eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 43062eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 43070b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 43082eaa055fSJeff Mahoney 43093a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 43107ab19625SDavid Sterba out_drop_write: 43117ab19625SDavid Sterba mnt_drop_write_file(file); 43127ab19625SDavid Sterba 43137ab19625SDavid Sterba return ret; 43142eaa055fSJeff Mahoney } 43152eaa055fSJeff Mahoney 43169ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 43172351f431SJosef Bacik { 43182351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 43192351f431SJosef Bacik int ret; 43202351f431SJosef Bacik 43212351f431SJosef Bacik if (compat) { 43222351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43232351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 43242351f431SJosef Bacik 43252351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 43262351f431SJosef Bacik if (ret) 43272351f431SJosef Bacik return -EFAULT; 43282351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 43292351f431SJosef Bacik if (!arg) 43302351f431SJosef Bacik return -ENOMEM; 43312351f431SJosef Bacik arg->send_fd = args32.send_fd; 43322351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 43332351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 43342351f431SJosef Bacik arg->parent_root = args32.parent_root; 43352351f431SJosef Bacik arg->flags = args32.flags; 43362351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 43372351f431SJosef Bacik sizeof(args32.reserved)); 43382351f431SJosef Bacik #else 43392351f431SJosef Bacik return -ENOTTY; 43402351f431SJosef Bacik #endif 43412351f431SJosef Bacik } else { 43422351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 43432351f431SJosef Bacik if (IS_ERR(arg)) 43442351f431SJosef Bacik return PTR_ERR(arg); 43452351f431SJosef Bacik } 43469ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 43472351f431SJosef Bacik kfree(arg); 43482351f431SJosef Bacik return ret; 43492351f431SJosef Bacik } 43502351f431SJosef Bacik 43511881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 43521881fba8SOmar Sandoval bool compat) 43531881fba8SOmar Sandoval { 43541881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 43551881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 43561881fba8SOmar Sandoval flags); 43571881fba8SOmar Sandoval size_t copy_end; 43581881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 43591881fba8SOmar Sandoval struct iovec *iov = iovstack; 43601881fba8SOmar Sandoval struct iov_iter iter; 43611881fba8SOmar Sandoval loff_t pos; 43621881fba8SOmar Sandoval struct kiocb kiocb; 43631881fba8SOmar Sandoval ssize_t ret; 43641881fba8SOmar Sandoval 43651881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 43661881fba8SOmar Sandoval ret = -EPERM; 43671881fba8SOmar Sandoval goto out_acct; 43681881fba8SOmar Sandoval } 43691881fba8SOmar Sandoval 43701881fba8SOmar Sandoval if (compat) { 43711881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43721881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 43731881fba8SOmar Sandoval 43741881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 43751881fba8SOmar Sandoval flags); 43761881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 43771881fba8SOmar Sandoval ret = -EFAULT; 43781881fba8SOmar Sandoval goto out_acct; 43791881fba8SOmar Sandoval } 43801881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 43811881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 43821881fba8SOmar Sandoval args.offset = args32.offset; 43831881fba8SOmar Sandoval args.flags = args32.flags; 43841881fba8SOmar Sandoval #else 43851881fba8SOmar Sandoval return -ENOTTY; 43861881fba8SOmar Sandoval #endif 43871881fba8SOmar Sandoval } else { 43881881fba8SOmar Sandoval copy_end = copy_end_kernel; 43891881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 43901881fba8SOmar Sandoval ret = -EFAULT; 43911881fba8SOmar Sandoval goto out_acct; 43921881fba8SOmar Sandoval } 43931881fba8SOmar Sandoval } 43941881fba8SOmar Sandoval if (args.flags != 0) { 43951881fba8SOmar Sandoval ret = -EINVAL; 43961881fba8SOmar Sandoval goto out_acct; 43971881fba8SOmar Sandoval } 43981881fba8SOmar Sandoval 4399de4eda9dSAl Viro ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 44001881fba8SOmar Sandoval &iov, &iter); 44011881fba8SOmar Sandoval if (ret < 0) 44021881fba8SOmar Sandoval goto out_acct; 44031881fba8SOmar Sandoval 44041881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 44051881fba8SOmar Sandoval ret = 0; 44061881fba8SOmar Sandoval goto out_iov; 44071881fba8SOmar Sandoval } 44081881fba8SOmar Sandoval pos = args.offset; 44091881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 44101881fba8SOmar Sandoval if (ret < 0) 44111881fba8SOmar Sandoval goto out_iov; 44121881fba8SOmar Sandoval 44131881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 44141881fba8SOmar Sandoval kiocb.ki_pos = pos; 44151881fba8SOmar Sandoval 44161881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 44171881fba8SOmar Sandoval if (ret >= 0) { 44181881fba8SOmar Sandoval fsnotify_access(file); 44191881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 44201881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 44211881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 44221881fba8SOmar Sandoval ret = -EFAULT; 44231881fba8SOmar Sandoval } 44241881fba8SOmar Sandoval 44251881fba8SOmar Sandoval out_iov: 44261881fba8SOmar Sandoval kfree(iov); 44271881fba8SOmar Sandoval out_acct: 44281881fba8SOmar Sandoval if (ret > 0) 44291881fba8SOmar Sandoval add_rchar(current, ret); 44301881fba8SOmar Sandoval inc_syscr(current); 44311881fba8SOmar Sandoval return ret; 44321881fba8SOmar Sandoval } 44331881fba8SOmar Sandoval 44347c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 44357c0c7269SOmar Sandoval { 44367c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 44377c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 44387c0c7269SOmar Sandoval struct iovec *iov = iovstack; 44397c0c7269SOmar Sandoval struct iov_iter iter; 44407c0c7269SOmar Sandoval loff_t pos; 44417c0c7269SOmar Sandoval struct kiocb kiocb; 44427c0c7269SOmar Sandoval ssize_t ret; 44437c0c7269SOmar Sandoval 44447c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 44457c0c7269SOmar Sandoval ret = -EPERM; 44467c0c7269SOmar Sandoval goto out_acct; 44477c0c7269SOmar Sandoval } 44487c0c7269SOmar Sandoval 44497c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 44507c0c7269SOmar Sandoval ret = -EBADF; 44517c0c7269SOmar Sandoval goto out_acct; 44527c0c7269SOmar Sandoval } 44537c0c7269SOmar Sandoval 44547c0c7269SOmar Sandoval if (compat) { 44557c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 44567c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 44577c0c7269SOmar Sandoval 44587c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 44597c0c7269SOmar Sandoval ret = -EFAULT; 44607c0c7269SOmar Sandoval goto out_acct; 44617c0c7269SOmar Sandoval } 44627c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 44637c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 44647c0c7269SOmar Sandoval args.offset = args32.offset; 44657c0c7269SOmar Sandoval args.flags = args32.flags; 44667c0c7269SOmar Sandoval args.len = args32.len; 44677c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 44687c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 44697c0c7269SOmar Sandoval args.compression = args32.compression; 44707c0c7269SOmar Sandoval args.encryption = args32.encryption; 44717c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 44727c0c7269SOmar Sandoval #else 44737c0c7269SOmar Sandoval return -ENOTTY; 44747c0c7269SOmar Sandoval #endif 44757c0c7269SOmar Sandoval } else { 44767c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 44777c0c7269SOmar Sandoval ret = -EFAULT; 44787c0c7269SOmar Sandoval goto out_acct; 44797c0c7269SOmar Sandoval } 44807c0c7269SOmar Sandoval } 44817c0c7269SOmar Sandoval 44827c0c7269SOmar Sandoval ret = -EINVAL; 44837c0c7269SOmar Sandoval if (args.flags != 0) 44847c0c7269SOmar Sandoval goto out_acct; 44857c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 44867c0c7269SOmar Sandoval goto out_acct; 44877c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 44887c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 44897c0c7269SOmar Sandoval goto out_acct; 44907c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 44917c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 44927c0c7269SOmar Sandoval goto out_acct; 44937c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 44947c0c7269SOmar Sandoval goto out_acct; 44957c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 44967c0c7269SOmar Sandoval goto out_acct; 44977c0c7269SOmar Sandoval 4498de4eda9dSAl Viro ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 44997c0c7269SOmar Sandoval &iov, &iter); 45007c0c7269SOmar Sandoval if (ret < 0) 45017c0c7269SOmar Sandoval goto out_acct; 45027c0c7269SOmar Sandoval 45037c0c7269SOmar Sandoval file_start_write(file); 45047c0c7269SOmar Sandoval 45057c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 45067c0c7269SOmar Sandoval ret = 0; 45077c0c7269SOmar Sandoval goto out_end_write; 45087c0c7269SOmar Sandoval } 45097c0c7269SOmar Sandoval pos = args.offset; 45107c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 45117c0c7269SOmar Sandoval if (ret < 0) 45127c0c7269SOmar Sandoval goto out_end_write; 45137c0c7269SOmar Sandoval 45147c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 45157c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 45167c0c7269SOmar Sandoval if (ret) 45177c0c7269SOmar Sandoval goto out_end_write; 45187c0c7269SOmar Sandoval kiocb.ki_pos = pos; 45197c0c7269SOmar Sandoval 45207c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 45217c0c7269SOmar Sandoval if (ret > 0) 45227c0c7269SOmar Sandoval fsnotify_modify(file); 45237c0c7269SOmar Sandoval 45247c0c7269SOmar Sandoval out_end_write: 45257c0c7269SOmar Sandoval file_end_write(file); 45267c0c7269SOmar Sandoval kfree(iov); 45277c0c7269SOmar Sandoval out_acct: 45287c0c7269SOmar Sandoval if (ret > 0) 45297c0c7269SOmar Sandoval add_wchar(current, ret); 45307c0c7269SOmar Sandoval inc_syscw(current); 45317c0c7269SOmar Sandoval return ret; 45327c0c7269SOmar Sandoval } 45337c0c7269SOmar Sandoval 4534f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4535f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4536f46b5a66SChristoph Hellwig { 45370b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45380b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45390b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45404bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4541f46b5a66SChristoph Hellwig 4542f46b5a66SChristoph Hellwig switch (cmd) { 45436cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 4544dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 454540cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4546b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 454740cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 454840cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4549f7039b1dSLi Dongyang case FITRIM: 4550b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4551f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4552fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4553fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4554fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45553de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4556fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45576f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45586f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 455976dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4560949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4561949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4562949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 45630caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45649ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 45650caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45660caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45676ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45686ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4569f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45701e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45711e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45721e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4573f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4574198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4575f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45762ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4577f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4578da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 45796b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 45806b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4581475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 45822ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4583475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 45842ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4585ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 45869ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 4587cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 45889ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 4589ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4590dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 4591d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4592d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4593d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4594d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4595d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4596d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 45971406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 45982ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 45999b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 46009b199859SFilipe David Borba Manana int ret; 46019b199859SFilipe David Borba Manana 46029db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 46039b199859SFilipe David Borba Manana if (ret) 46049b199859SFilipe David Borba Manana return ret; 46050b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 46062fad4e83SDavid Sterba /* 46072fad4e83SDavid Sterba * The transaction thread may want to do more work, 460801327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 46092fad4e83SDavid Sterba * processing uncleaned subvols. 46102fad4e83SDavid Sterba */ 46110b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 46129b199859SFilipe David Borba Manana return ret; 46139b199859SFilipe David Borba Manana } 461446204592SSage Weil case BTRFS_IOC_START_SYNC: 46159a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 461646204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 46172ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4618475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4619b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4620475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 46212ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4622475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 46232ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4624c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 46259ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4626837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 46272ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 462819a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 46292ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 46308ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 46318ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4632abccd00fSHugo Mills #ifdef CONFIG_64BIT 4633abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4634abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4635abccd00fSHugo Mills #endif 463631db9f7cSAlexander Block case BTRFS_IOC_SEND: 46379ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 46382351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46392351f431SJosef Bacik case BTRFS_IOC_SEND_32: 46409ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 46412351f431SJosef Bacik #endif 4642c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 46432ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 46445d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4645905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 46465d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4647905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 46485d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4649905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 46505d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4651905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 46522f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 46532f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 46542f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4655b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 465657254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4657b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 46583f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 46592ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 46602eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4661d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 46622eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4663b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 46642eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 46652eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4666b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 46679ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 466842e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 4669dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 467023d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 467123d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 467214605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 467314605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 467414605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 467514605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 46761881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 46771881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 46787c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 46797c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 46801881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46811881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 46821881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 46837c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 46847c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 46851881fba8SOmar Sandoval #endif 4686f46b5a66SChristoph Hellwig } 4687f46b5a66SChristoph Hellwig 4688f46b5a66SChristoph Hellwig return -ENOTTY; 4689f46b5a66SChristoph Hellwig } 46904c63c245SLuke Dashjr 46914c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 46924c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 46934c63c245SLuke Dashjr { 46942a362249SJeff Mahoney /* 46952a362249SJeff Mahoney * These all access 32-bit values anyway so no further 46962a362249SJeff Mahoney * handling is necessary. 46972a362249SJeff Mahoney */ 46984c63c245SLuke Dashjr switch (cmd) { 46994c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 47004c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 47014c63c245SLuke Dashjr break; 47024c63c245SLuke Dashjr } 47034c63c245SLuke Dashjr 47044c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 47054c63c245SLuke Dashjr } 47064c63c245SLuke Dashjr #endif 4707