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 || 457ac868bc9Sxiaoshoukui fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD || 458ac868bc9Sxiaoshoukui fs_info->exclusive_operation == BTRFS_EXCLOP_NONE || 459ac868bc9Sxiaoshoukui fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 460efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 461efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 462efc0e69cSNikolay Borisov break; 463efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 464efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 465efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 466efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 467efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 468efc0e69cSNikolay Borisov break; 469efc0e69cSNikolay Borisov default: 470efc0e69cSNikolay Borisov btrfs_warn(fs_info, 471efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 472efc0e69cSNikolay Borisov } 473efc0e69cSNikolay Borisov } 474efc0e69cSNikolay Borisov 475dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4766cbff00fSChristoph Hellwig { 4776cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4786cbff00fSChristoph Hellwig } 479f46b5a66SChristoph Hellwig 480b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 481b929c1d8SMarcos Paulo de Souza void __user *arg) 482f7039b1dSLi Dongyang { 483f7039b1dSLi Dongyang struct btrfs_device *device; 484f7039b1dSLi Dongyang struct fstrim_range range; 485f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 486f7039b1dSLi Dongyang u64 num_devices = 0; 487f7039b1dSLi Dongyang int ret; 488f7039b1dSLi Dongyang 489f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 490f7039b1dSLi Dongyang return -EPERM; 491f7039b1dSLi Dongyang 492f35f06c3SFilipe Manana /* 4931cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4941cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4951cb3dc3fSNaohiro Aota * filesystem for now. 4961cb3dc3fSNaohiro Aota */ 4971cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4981cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4991cb3dc3fSNaohiro Aota 5001cb3dc3fSNaohiro Aota /* 501f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 502f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 503f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 504f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 505f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 506f35f06c3SFilipe Manana */ 507f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 508f35f06c3SFilipe Manana return -EROFS; 509f35f06c3SFilipe Manana 5101f78160cSXiao Guangrong rcu_read_lock(); 5111f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5121f78160cSXiao Guangrong dev_list) { 5137b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 514f7039b1dSLi Dongyang continue; 515f7039b1dSLi Dongyang num_devices++; 5167b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 517f7039b1dSLi Dongyang minlen); 518f7039b1dSLi Dongyang } 5191f78160cSXiao Guangrong rcu_read_unlock(); 520f4c697e6SLukas Czerner 521f7039b1dSLi Dongyang if (!num_devices) 522f7039b1dSLi Dongyang return -EOPNOTSUPP; 523f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 524f7039b1dSLi Dongyang return -EFAULT; 5256ba9fc8eSQu Wenruo 5266ba9fc8eSQu Wenruo /* 5276ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5286ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5296ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5306ba9fc8eSQu Wenruo */ 5316ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 532f4c697e6SLukas Czerner return -EINVAL; 533f7039b1dSLi Dongyang 534f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5352ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 536f7039b1dSLi Dongyang if (ret < 0) 537f7039b1dSLi Dongyang return ret; 538f7039b1dSLi Dongyang 539f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 540f7039b1dSLi Dongyang return -EFAULT; 541f7039b1dSLi Dongyang 542f7039b1dSLi Dongyang return 0; 543f7039b1dSLi Dongyang } 544f7039b1dSLi Dongyang 545e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 546dd5f9615SStefan Behrens { 54746e0f66aSChris Mason int i; 54846e0f66aSChris Mason 54946e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 55046e0f66aSChris Mason if (uuid[i]) 55146e0f66aSChris Mason return 0; 55246e0f66aSChris Mason } 55346e0f66aSChris Mason return 1; 554dd5f9615SStefan Behrens } 555dd5f9615SStefan Behrens 5563538d68dSOmar Sandoval /* 5573538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5583538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5593538d68dSOmar Sandoval */ 5603538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5613538d68dSOmar Sandoval { 5623538d68dSOmar Sandoval /* 5633538d68dSOmar Sandoval * 1 to add root block 5643538d68dSOmar Sandoval * 1 to add root item 5653538d68dSOmar Sandoval * 1 to add root ref 5663538d68dSOmar Sandoval * 1 to add root backref 5673538d68dSOmar Sandoval * 1 to add UUID item 5683538d68dSOmar Sandoval * 1 to add qgroup info 5693538d68dSOmar Sandoval * 1 to add qgroup limit 5703538d68dSOmar Sandoval * 5713538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5723538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5733538d68dSOmar Sandoval */ 5743538d68dSOmar Sandoval unsigned int num_items = 7; 5753538d68dSOmar Sandoval 5763538d68dSOmar Sandoval if (inherit) { 5773538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5783538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5793538d68dSOmar Sandoval } 5803538d68dSOmar Sandoval return num_items; 5813538d68dSOmar Sandoval } 5823538d68dSOmar Sandoval 583f2d40141SChristian Brauner static noinline int create_subvol(struct mnt_idmap *idmap, 5844d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5858696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 586f46b5a66SChristoph Hellwig { 5870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 588f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 589f46b5a66SChristoph Hellwig struct btrfs_key key; 59049a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 591f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 592f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 593d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 59476dda93cSYan, Zheng struct btrfs_root *new_root; 595d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 59695582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5973538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5983538d68dSOmar Sandoval .dir = dir, 5993538d68dSOmar Sandoval .dentry = dentry, 6003538d68dSOmar Sandoval .subvol = true, 6013538d68dSOmar Sandoval }; 6023538d68dSOmar Sandoval unsigned int trans_num_items; 603f46b5a66SChristoph Hellwig int ret; 6042256e901SOmar Sandoval dev_t anon_dev; 605f46b5a66SChristoph Hellwig u64 objectid; 606f46b5a66SChristoph Hellwig 60749a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 60849a3c4d9SDavid Sterba if (!root_item) 60949a3c4d9SDavid Sterba return -ENOMEM; 61049a3c4d9SDavid Sterba 611543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6122fbe8c8aSAl Viro if (ret) 6132256e901SOmar Sandoval goto out_root_item; 6142dfb1e43SQu Wenruo 615e09fe2d2SQu Wenruo /* 616e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 61701327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 618e09fe2d2SQu Wenruo */ 61949a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 62049a3c4d9SDavid Sterba ret = -ENOSPC; 6212256e901SOmar Sandoval goto out_root_item; 62249a3c4d9SDavid Sterba } 623e09fe2d2SQu Wenruo 6242256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6252256e901SOmar Sandoval if (ret < 0) 6262256e901SOmar Sandoval goto out_root_item; 6272256e901SOmar Sandoval 628f2d40141SChristian Brauner new_inode_args.inode = btrfs_new_subvol_inode(idmap, dir); 6293538d68dSOmar Sandoval if (!new_inode_args.inode) { 630a1fd0c35SOmar Sandoval ret = -ENOMEM; 631a1fd0c35SOmar Sandoval goto out_anon_dev; 632a1fd0c35SOmar Sandoval } 6333538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 634d5c12070SMiao Xie if (ret) 635a1fd0c35SOmar Sandoval goto out_inode; 6363538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6373538d68dSOmar Sandoval 6383538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6393538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6403538d68dSOmar Sandoval trans_num_items, false); 6413538d68dSOmar Sandoval if (ret) 6423538d68dSOmar Sandoval goto out_new_inode_args; 643f46b5a66SChristoph Hellwig 644d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 645d5c12070SMiao Xie if (IS_ERR(trans)) { 646d5c12070SMiao Xie ret = PTR_ERR(trans); 647e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6483538d68dSOmar Sandoval goto out_new_inode_args; 649d5c12070SMiao Xie } 650d5c12070SMiao Xie trans->block_rsv = &block_rsv; 651d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 652*1b53e51aSSweet Tea Dorminy /* Tree log can't currently deal with an inode which is a new root. */ 653*1b53e51aSSweet Tea Dorminy btrfs_set_log_full_commit(trans); 654f46b5a66SChristoph Hellwig 655a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6566f72c7e2SArne Jansen if (ret) 6572256e901SOmar Sandoval goto out; 6586f72c7e2SArne Jansen 6599631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6609631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6618e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6628e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6632256e901SOmar Sandoval goto out; 6648e8a1e31SJosef Bacik } 665f46b5a66SChristoph Hellwig 666f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 667f46b5a66SChristoph Hellwig 66849a3c4d9SDavid Sterba inode_item = &root_item->inode; 6693cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6703cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6713cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 672da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6730b246afaSJeff Mahoney fs_info->nodesize); 6743cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 675f46b5a66SChristoph Hellwig 67649a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 67749a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6783cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 67908fe4db1SLi Zefan 68049a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 68149a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 68249a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 68349a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 68449a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68549a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 686f46b5a66SChristoph Hellwig 68749a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 68849a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 689807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 69049a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 69149a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 69249a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 69349a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 69449a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 695f46b5a66SChristoph Hellwig 696925baeddSChris Mason btrfs_tree_unlock(leaf); 697f46b5a66SChristoph Hellwig 69869948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 699f46b5a66SChristoph Hellwig 700f46b5a66SChristoph Hellwig key.objectid = objectid; 7015d4f98a2SYan Zheng key.offset = 0; 702962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7030b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70449a3c4d9SDavid Sterba root_item); 70567addf29SFilipe Manana if (ret) { 70667addf29SFilipe Manana /* 70767addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 70867addf29SFilipe Manana * tree block so that we don't leak space and leave the 70967addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 7107a163608SFilipe Manana * extent tree with a backreference for a root that does not 711212a58fdSFilipe Manana * exists). 71267addf29SFilipe Manana */ 713212a58fdSFilipe Manana btrfs_tree_lock(leaf); 714190a8339SJosef Bacik btrfs_clear_buffer_dirty(trans, leaf); 715212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7167a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 71767addf29SFilipe Manana free_extent_buffer(leaf); 7182256e901SOmar Sandoval goto out; 71967addf29SFilipe Manana } 72067addf29SFilipe Manana 72167addf29SFilipe Manana free_extent_buffer(leaf); 72267addf29SFilipe Manana leaf = NULL; 723f46b5a66SChristoph Hellwig 7242dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 72579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 72679787eaaSJeff Mahoney ret = PTR_ERR(new_root); 72766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7282256e901SOmar Sandoval goto out; 72979787eaaSJeff Mahoney } 7302256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7312dfb1e43SQu Wenruo anon_dev = 0; 7323538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7333538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 73476dda93cSYan, Zheng 735221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 736221581e4SJosef Bacik if (ret) { 737221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7382256e901SOmar Sandoval goto out; 739c7e54b51SJosef Bacik } 7400660b5afSChris Mason 741cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7426bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 743caae78e0SOmar Sandoval if (ret) { 74466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 745caae78e0SOmar Sandoval goto out; 746caae78e0SOmar Sandoval } 747dd5f9615SStefan Behrens 748caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 749caae78e0SOmar Sandoval if (ret) { 750caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 751caae78e0SOmar Sandoval goto out; 752caae78e0SOmar Sandoval } 753caae78e0SOmar Sandoval 754caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 755caae78e0SOmar Sandoval new_inode_args.inode = NULL; 756f46b5a66SChristoph Hellwig 7572256e901SOmar Sandoval out: 758d5c12070SMiao Xie trans->block_rsv = NULL; 759d5c12070SMiao Xie trans->bytes_reserved = 0; 760e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 761de6e8200SLiu Bo 7621b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7633538d68dSOmar Sandoval out_new_inode_args: 7643538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 765a1fd0c35SOmar Sandoval out_inode: 7663538d68dSOmar Sandoval iput(new_inode_args.inode); 7672256e901SOmar Sandoval out_anon_dev: 7682dfb1e43SQu Wenruo if (anon_dev) 7692dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7702256e901SOmar Sandoval out_root_item: 77149a3c4d9SDavid Sterba kfree(root_item); 77249a3c4d9SDavid Sterba return ret; 773f46b5a66SChristoph Hellwig } 774f46b5a66SChristoph Hellwig 775e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7769babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 777e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 778f46b5a66SChristoph Hellwig { 7790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7802e4bfab9SYan, Zheng struct inode *inode; 781f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7823538d68dSOmar Sandoval unsigned int trans_num_items; 783f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7842e4bfab9SYan, Zheng int ret; 785f46b5a66SChristoph Hellwig 786813febdbSJosef Bacik /* We do not support snapshotting right now. */ 787813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 788813febdbSJosef Bacik btrfs_warn(fs_info, 789813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 790813febdbSJosef Bacik return -EOPNOTSUPP; 791813febdbSJosef Bacik } 792813febdbSJosef Bacik 79392a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 794f46b5a66SChristoph Hellwig return -EINVAL; 795f46b5a66SChristoph Hellwig 796eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 797eede2bf3SOmar Sandoval btrfs_warn(fs_info, 798eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 799eede2bf3SOmar Sandoval return -ETXTBSY; 800eede2bf3SOmar Sandoval } 801eede2bf3SOmar Sandoval 80223269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 803a1ee7362SDavid Sterba if (!pending_snapshot) 804a1ee7362SDavid Sterba return -ENOMEM; 805a1ee7362SDavid Sterba 8062dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8072dfb1e43SQu Wenruo if (ret < 0) 8082dfb1e43SQu Wenruo goto free_pending; 809b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 81023269bf5SDavid Sterba GFP_KERNEL); 8118546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8128546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 813b0c0ea63SDavid Sterba ret = -ENOMEM; 814b0c0ea63SDavid Sterba goto free_pending; 815b0c0ea63SDavid Sterba } 816b0c0ea63SDavid Sterba 81766d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 81866d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 819d5c12070SMiao Xie /* 8203538d68dSOmar Sandoval * 1 to add dir item 8213538d68dSOmar Sandoval * 1 to add dir index 8223538d68dSOmar Sandoval * 1 to update parent inode item 823d5c12070SMiao Xie */ 8243538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 825d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8263538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8273538d68dSOmar Sandoval trans_num_items, false); 828d5c12070SMiao Xie if (ret) 829c11fbb6eSRobbie Ko goto free_pending; 830d5c12070SMiao Xie 831a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 832a22285a6SYan, Zheng pending_snapshot->root = root; 833b83cc969SLi Zefan pending_snapshot->readonly = readonly; 834e9662f70SMiao Xie pending_snapshot->dir = dir; 8358696c533SMiao Xie pending_snapshot->inherit = inherit; 836a22285a6SYan, Zheng 837d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 838a22285a6SYan, Zheng if (IS_ERR(trans)) { 839a22285a6SYan, Zheng ret = PTR_ERR(trans); 840a22285a6SYan, Zheng goto fail; 841a22285a6SYan, Zheng } 842a22285a6SYan, Zheng 84328b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8449babda9fSNikolay Borisov 8453a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 846aec8030aSMiao Xie if (ret) 847c37b2b62SJosef Bacik goto fail; 848a22285a6SYan, Zheng 849a22285a6SYan, Zheng ret = pending_snapshot->error; 850f46b5a66SChristoph Hellwig if (ret) 8512e4bfab9SYan, Zheng goto fail; 852f46b5a66SChristoph Hellwig 853d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 854d3797308SChris Mason if (ret) 855d3797308SChris Mason goto fail; 856d3797308SChris Mason 8572b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8582e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8592e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8602e4bfab9SYan, Zheng goto fail; 8612e4bfab9SYan, Zheng } 8625662344bSTsutomu Itoh 8632e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8642e4bfab9SYan, Zheng ret = 0; 8652dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8662e4bfab9SYan, Zheng fail: 8672dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8682dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8692dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 87000246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 871e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 872b0c0ea63SDavid Sterba free_pending: 8732dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8742dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 875b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8768546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 877a1ee7362SDavid Sterba kfree(pending_snapshot); 878a1ee7362SDavid Sterba 879f46b5a66SChristoph Hellwig return ret; 880f46b5a66SChristoph Hellwig } 881f46b5a66SChristoph Hellwig 8824260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8834260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8844260f7c7SSage Weil * whether the type of victim is right. 8854260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8864260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8874260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8884260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8894260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8904260f7c7SSage Weil * a. be owner of dir, or 8914260f7c7SSage Weil * b. be owner of victim, or 8924260f7c7SSage Weil * c. have CAP_FOWNER capability 89301327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8944260f7c7SSage Weil * links pointing to it. 8954260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8964260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8974260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8984260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8994260f7c7SSage Weil * nfs_async_unlink(). 9004260f7c7SSage Weil */ 9014260f7c7SSage Weil 9024609e1f1SChristian Brauner static int btrfs_may_delete(struct mnt_idmap *idmap, 903c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 9044260f7c7SSage Weil { 9054260f7c7SSage Weil int error; 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 9134609e1f1SChristian 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; 9189452e93eSChristian Brauner if (check_sticky(idmap, 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() */ 9374609e1f1SChristian 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; 9444609e1f1SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, idmap)) 9455474bf40SChristian Brauner return -EOVERFLOW; 9464609e1f1SChristian 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, 9554609e1f1SChristian 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); 965cb8e7090SChristoph Hellwig int error; 966cb8e7090SChristoph Hellwig 96700235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96800235411SAl Viro if (error == -EINTR) 96900235411SAl Viro return error; 970cb8e7090SChristoph Hellwig 9714609e1f1SChristian Brauner dentry = lookup_one(idmap, name, parent->dentry, namelen); 972cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 973cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 974cb8e7090SChristoph Hellwig goto out_unlock; 975cb8e7090SChristoph Hellwig 9764609e1f1SChristian Brauner error = btrfs_may_create(idmap, dir, dentry); 977cb8e7090SChristoph Hellwig if (error) 978a874a63eSLiu Bo goto out_dput; 979cb8e7090SChristoph Hellwig 9809c52057cSChris Mason /* 9819c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9829c52057cSChris Mason * check for them now when we can safely fail 9839c52057cSChris Mason */ 9849c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 985e43eec81SSweet Tea Dorminy dir->i_ino, &name_str); 9869c52057cSChris Mason if (error) 9879c52057cSChris Mason goto out_dput; 9889c52057cSChris Mason 9890b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 99076dda93cSYan, Zheng 99176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 99276dda93cSYan, Zheng goto out_up_read; 99376dda93cSYan, Zheng 9949babda9fSNikolay Borisov if (snap_src) 9959babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9969babda9fSNikolay Borisov else 997f2d40141SChristian Brauner error = create_subvol(idmap, dir, dentry, inherit); 9989babda9fSNikolay Borisov 99976dda93cSYan, Zheng if (!error) 100076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 100176dda93cSYan, Zheng out_up_read: 10020b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1003cb8e7090SChristoph Hellwig out_dput: 1004cb8e7090SChristoph Hellwig dput(dentry); 1005cb8e7090SChristoph Hellwig out_unlock: 1006e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(dir), 0); 1007cb8e7090SChristoph Hellwig return error; 1008cb8e7090SChristoph Hellwig } 1009cb8e7090SChristoph Hellwig 1010c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10114609e1f1SChristian Brauner struct mnt_idmap *idmap, 1012c11fbb6eSRobbie Ko const char *name, int namelen, 1013c11fbb6eSRobbie Ko struct btrfs_root *root, 1014c11fbb6eSRobbie Ko bool readonly, 1015c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1016c11fbb6eSRobbie Ko { 1017c11fbb6eSRobbie Ko int ret; 1018c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1019c11fbb6eSRobbie Ko 1020c11fbb6eSRobbie Ko /* 1021c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1022c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1023c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1024c11fbb6eSRobbie Ko */ 1025c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1026c11fbb6eSRobbie Ko 1027f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1028c11fbb6eSRobbie Ko if (ret) 1029c11fbb6eSRobbie Ko goto out; 1030c11fbb6eSRobbie Ko 1031c11fbb6eSRobbie Ko /* 1032c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1033c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1034c11fbb6eSRobbie Ko * creation. 1035c11fbb6eSRobbie Ko */ 1036c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1037c11fbb6eSRobbie Ko snapshot_force_cow = true; 1038c11fbb6eSRobbie Ko 1039c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1040c11fbb6eSRobbie Ko 10414609e1f1SChristian Brauner ret = btrfs_mksubvol(parent, idmap, name, namelen, 1042c11fbb6eSRobbie Ko root, readonly, inherit); 1043c11fbb6eSRobbie Ko out: 1044c11fbb6eSRobbie Ko if (snapshot_force_cow) 1045c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1046c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1047c11fbb6eSRobbie Ko return ret; 1048c11fbb6eSRobbie Ko } 1049c11fbb6eSRobbie Ko 1050d5633b0dSQu Wenruo /* 105117aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 105217aaa434SDavid Sterba * 105317aaa434SDavid Sterba * Return: 105417aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 105517aaa434SDavid Sterba * >0 - normal mode, something else is running, 105617aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 105717aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 105817aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 105917aaa434SDavid Sterba */ 106017aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 106117aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 106217aaa434SDavid Sterba { 106317aaa434SDavid Sterba if (!cancel) { 106417aaa434SDavid Sterba /* Start normal op */ 106517aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 106617aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 106717aaa434SDavid Sterba /* Exclusive operation is now claimed */ 106817aaa434SDavid Sterba return 0; 106917aaa434SDavid Sterba } 107017aaa434SDavid Sterba 107117aaa434SDavid Sterba /* Cancel running op */ 107217aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 107317aaa434SDavid Sterba /* 107417aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 107517aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 107617aaa434SDavid Sterba * or it has finished and no waiting will happen. 107717aaa434SDavid Sterba */ 107817aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 107917aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 108017aaa434SDavid Sterba 108117aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 108217aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 108317aaa434SDavid Sterba TASK_INTERRUPTIBLE); 108417aaa434SDavid Sterba 108517aaa434SDavid Sterba return -ECANCELED; 108617aaa434SDavid Sterba } 108717aaa434SDavid Sterba 108817aaa434SDavid Sterba /* Something else is running or none */ 108917aaa434SDavid Sterba return -ENOTCONN; 109017aaa434SDavid Sterba } 109117aaa434SDavid Sterba 1092198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 109376dda93cSYan, Zheng void __user *arg) 1094f46b5a66SChristoph Hellwig { 1095562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 10960b246afaSJeff Mahoney struct inode *inode = file_inode(file); 10970b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1098f46b5a66SChristoph Hellwig u64 new_size; 1099f46b5a66SChristoph Hellwig u64 old_size; 1100f46b5a66SChristoph Hellwig u64 devid = 1; 11010b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1102f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1103f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1104f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1105f46b5a66SChristoph Hellwig char *sizestr; 11069a40f122SGui Hecheng char *retptr; 1107f46b5a66SChristoph Hellwig char *devstr = NULL; 1108f46b5a66SChristoph Hellwig int ret = 0; 1109f46b5a66SChristoph Hellwig int mod = 0; 1110bb059a37SDavid Sterba bool cancel; 1111f46b5a66SChristoph Hellwig 1112e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1113e441d54dSChris Mason return -EPERM; 1114e441d54dSChris Mason 1115198605a8SMiao Xie ret = mnt_want_write_file(file); 1116198605a8SMiao Xie if (ret) 1117198605a8SMiao Xie return ret; 1118198605a8SMiao Xie 1119bb059a37SDavid Sterba /* 1120bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1121bb059a37SDavid Sterba * distinguish regular resize and cancel 1122bb059a37SDavid Sterba */ 1123dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1124c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1125c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1126bb059a37SDavid Sterba goto out_drop; 1127c9e9f97bSIlya Dryomov } 11285516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1129f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1130bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1131bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1132bb059a37SDavid Sterba if (ret) 1133bb059a37SDavid Sterba goto out_free; 1134bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1135bb059a37SDavid Sterba 1136f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1137f46b5a66SChristoph Hellwig if (devstr) { 1138f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1139f46b5a66SChristoph Hellwig *devstr = '\0'; 1140f46b5a66SChristoph Hellwig devstr = vol_args->name; 114158dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 114258dfae63SZhangZhen if (ret) 1143bb059a37SDavid Sterba goto out_finish; 1144dfd79829SMiao Xie if (!devid) { 1145dfd79829SMiao Xie ret = -EINVAL; 1146bb059a37SDavid Sterba goto out_finish; 1147dfd79829SMiao Xie } 11480b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1149f46b5a66SChristoph Hellwig } 1150dba60f3fSMiao Xie 1151562d7b15SJosef Bacik args.devid = devid; 1152562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 1153f46b5a66SChristoph Hellwig if (!device) { 11540b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1155c1c9ff7cSGeert Uytterhoeven devid); 1156dfd79829SMiao Xie ret = -ENODEV; 1157bb059a37SDavid Sterba goto out_finish; 1158f46b5a66SChristoph Hellwig } 1159dba60f3fSMiao Xie 1160ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 11610b246afaSJeff Mahoney btrfs_info(fs_info, 1162efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1163c1c9ff7cSGeert Uytterhoeven devid); 1164dfd79829SMiao Xie ret = -EPERM; 1165bb059a37SDavid Sterba goto out_finish; 11664e42ae1bSLiu Bo } 11674e42ae1bSLiu Bo 1168f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1169cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 1170f46b5a66SChristoph Hellwig else { 1171f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1172f46b5a66SChristoph Hellwig mod = -1; 1173f46b5a66SChristoph Hellwig sizestr++; 1174f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1175f46b5a66SChristoph Hellwig mod = 1; 1176f46b5a66SChristoph Hellwig sizestr++; 1177f46b5a66SChristoph Hellwig } 11789a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 11799a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1180f46b5a66SChristoph Hellwig ret = -EINVAL; 1181bb059a37SDavid Sterba goto out_finish; 1182f46b5a66SChristoph Hellwig } 1183f46b5a66SChristoph Hellwig } 1184f46b5a66SChristoph Hellwig 1185401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1186dfd79829SMiao Xie ret = -EPERM; 1187bb059a37SDavid Sterba goto out_finish; 118863a212abSStefan Behrens } 118963a212abSStefan Behrens 11907cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1191f46b5a66SChristoph Hellwig 1192f46b5a66SChristoph Hellwig if (mod < 0) { 1193f46b5a66SChristoph Hellwig if (new_size > old_size) { 1194f46b5a66SChristoph Hellwig ret = -EINVAL; 1195bb059a37SDavid Sterba goto out_finish; 1196f46b5a66SChristoph Hellwig } 1197f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1198f46b5a66SChristoph Hellwig } else if (mod > 0) { 1199eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1200902c68a4SGui Hecheng ret = -ERANGE; 1201bb059a37SDavid Sterba goto out_finish; 1202eb8052e0SWenliang Fan } 1203f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1204f46b5a66SChristoph Hellwig } 1205f46b5a66SChristoph Hellwig 1206ee22184bSByongho Lee if (new_size < SZ_256M) { 1207f46b5a66SChristoph Hellwig ret = -EINVAL; 1208bb059a37SDavid Sterba goto out_finish; 1209f46b5a66SChristoph Hellwig } 1210cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 1211f46b5a66SChristoph Hellwig ret = -EFBIG; 1212bb059a37SDavid Sterba goto out_finish; 1213f46b5a66SChristoph Hellwig } 1214f46b5a66SChristoph Hellwig 121547f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1216f46b5a66SChristoph Hellwig 1217f46b5a66SChristoph Hellwig if (new_size > old_size) { 1218a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 121998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 122098d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1221bb059a37SDavid Sterba goto out_finish; 122298d5dc13STsutomu Itoh } 1223f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 12243a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1225ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1226f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 12270253f40eSjeff.liu } /* equal, nothing need to do */ 1228f46b5a66SChristoph Hellwig 1229faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1230faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1231faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1232cb3e217bSQu Wenruo btrfs_dev_name(device), device->devid, 1233faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1234bb059a37SDavid Sterba out_finish: 1235bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1236c9e9f97bSIlya Dryomov out_free: 1237f46b5a66SChristoph Hellwig kfree(vol_args); 1238bb059a37SDavid Sterba out_drop: 123918f39c41SIlya Dryomov mnt_drop_write_file(file); 1240f46b5a66SChristoph Hellwig return ret; 1241f46b5a66SChristoph Hellwig } 1242f46b5a66SChristoph Hellwig 12435d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 12444609e1f1SChristian Brauner struct mnt_idmap *idmap, 124552f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 12465d54c67eSNikolay Borisov bool readonly, 12478696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1248f46b5a66SChristoph Hellwig { 1249f46b5a66SChristoph Hellwig int namelen; 12503de4586cSChris Mason int ret = 0; 1251f46b5a66SChristoph Hellwig 1252325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1253325c50e3SJeff Mahoney return -ENOTDIR; 1254325c50e3SJeff Mahoney 1255a874a63eSLiu Bo ret = mnt_want_write_file(file); 1256a874a63eSLiu Bo if (ret) 1257a874a63eSLiu Bo goto out; 1258a874a63eSLiu Bo 125972fd032eSSage Weil namelen = strlen(name); 126072fd032eSSage Weil if (strchr(name, '/')) { 1261f46b5a66SChristoph Hellwig ret = -EINVAL; 1262a874a63eSLiu Bo goto out_drop_write; 1263f46b5a66SChristoph Hellwig } 1264f46b5a66SChristoph Hellwig 126516780cabSChris Mason if (name[0] == '.' && 126616780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 126716780cabSChris Mason ret = -EEXIST; 1268a874a63eSLiu Bo goto out_drop_write; 126916780cabSChris Mason } 127016780cabSChris Mason 12713de4586cSChris Mason if (subvol) { 12724609e1f1SChristian Brauner ret = btrfs_mksubvol(&file->f_path, idmap, name, 12734d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1274cb8e7090SChristoph Hellwig } else { 12752903ff01SAl Viro struct fd src = fdget(fd); 12763de4586cSChris Mason struct inode *src_inode; 12772903ff01SAl Viro if (!src.file) { 12783de4586cSChris Mason ret = -EINVAL; 1279a874a63eSLiu Bo goto out_drop_write; 12803de4586cSChris Mason } 12813de4586cSChris Mason 1282496ad9aaSAl Viro src_inode = file_inode(src.file); 1283496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1284c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1285efe120a0SFrank Holton "Snapshot src from another FS"); 128623ad5b17SKusanagi Kouichi ret = -EXDEV; 128701beba79SChristian Brauner } else if (!inode_owner_or_capable(idmap, src_inode)) { 1288d0242061SDavid Sterba /* 1289d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1290d0242061SDavid Sterba * are limited to own subvolumes only 1291d0242061SDavid Sterba */ 1292d0242061SDavid Sterba ret = -EPERM; 1293ecd18815SAl Viro } else { 12944609e1f1SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, idmap, 12954d4340c9SChristian Brauner name, namelen, 129672fd032eSSage Weil BTRFS_I(src_inode)->root, 12975d54c67eSNikolay Borisov readonly, inherit); 1298ecd18815SAl Viro } 12992903ff01SAl Viro fdput(src); 1300cb8e7090SChristoph Hellwig } 1301a874a63eSLiu Bo out_drop_write: 1302a874a63eSLiu Bo mnt_drop_write_file(file); 1303f46b5a66SChristoph Hellwig out: 130472fd032eSSage Weil return ret; 130572fd032eSSage Weil } 130672fd032eSSage Weil 130772fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1308fa0d2b9bSLi Zefan void __user *arg, int subvol) 130972fd032eSSage Weil { 1310fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 131172fd032eSSage Weil int ret; 131272fd032eSSage Weil 1313325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1314325c50e3SJeff Mahoney return -ENOTDIR; 1315325c50e3SJeff Mahoney 1316fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1317fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1318fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1319fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1320fa0d2b9bSLi Zefan 13214609e1f1SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), 13224d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13234d4340c9SChristian Brauner false, NULL); 1324fa0d2b9bSLi Zefan 1325fa0d2b9bSLi Zefan kfree(vol_args); 1326fa0d2b9bSLi Zefan return ret; 1327fa0d2b9bSLi Zefan } 1328fa0d2b9bSLi Zefan 1329fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1330fa0d2b9bSLi Zefan void __user *arg, int subvol) 1331fa0d2b9bSLi Zefan { 1332fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1333fa0d2b9bSLi Zefan int ret; 1334b83cc969SLi Zefan bool readonly = false; 13356f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 133672fd032eSSage Weil 1337325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1338325c50e3SJeff Mahoney return -ENOTDIR; 1339325c50e3SJeff Mahoney 1340fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1341fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1342fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1343fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1344fdfb1e4fSLi Zefan 1345673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1346b83cc969SLi Zefan ret = -EOPNOTSUPP; 1347c47ca32dSDan Carpenter goto free_args; 1348fdfb1e4fSLi Zefan } 1349fdfb1e4fSLi Zefan 1350b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1351b83cc969SLi Zefan readonly = true; 13526f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 13535011c5a6SDan Carpenter u64 nums; 13545011c5a6SDan Carpenter 13555011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 13565011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 13576f72c7e2SArne Jansen ret = -EINVAL; 1358c47ca32dSDan Carpenter goto free_args; 13596f72c7e2SArne Jansen } 13606f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 13616f72c7e2SArne Jansen if (IS_ERR(inherit)) { 13626f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1363c47ca32dSDan Carpenter goto free_args; 13646f72c7e2SArne Jansen } 13655011c5a6SDan Carpenter 13665011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 13675011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 13685011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 13695011c5a6SDan Carpenter ret = -EINVAL; 13705011c5a6SDan Carpenter goto free_inherit; 13715011c5a6SDan Carpenter } 13725011c5a6SDan Carpenter 13735011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 13745011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 13755011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 13765011c5a6SDan Carpenter ret = -EINVAL; 13775011c5a6SDan Carpenter goto free_inherit; 13785011c5a6SDan Carpenter } 13796f72c7e2SArne Jansen } 138075eaa0e2SSage Weil 13814609e1f1SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file), 13824d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 13834d4340c9SChristian Brauner readonly, inherit); 1384c47ca32dSDan Carpenter if (ret) 1385c47ca32dSDan Carpenter goto free_inherit; 1386c47ca32dSDan Carpenter free_inherit: 13876f72c7e2SArne Jansen kfree(inherit); 1388c47ca32dSDan Carpenter free_args: 1389c47ca32dSDan Carpenter kfree(vol_args); 1390f46b5a66SChristoph Hellwig return ret; 1391f46b5a66SChristoph Hellwig } 1392f46b5a66SChristoph Hellwig 13939ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 13940caa102dSLi Zefan void __user *arg) 13950caa102dSLi Zefan { 13960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 13970caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 13980caa102dSLi Zefan int ret = 0; 13990caa102dSLi Zefan u64 flags = 0; 14000caa102dSLi Zefan 14014a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 14020caa102dSLi Zefan return -EINVAL; 14030caa102dSLi Zefan 14040b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 14050caa102dSLi Zefan if (btrfs_root_readonly(root)) 14060caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 14070b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 14080caa102dSLi Zefan 14090caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 14100caa102dSLi Zefan ret = -EFAULT; 14110caa102dSLi Zefan 14120caa102dSLi Zefan return ret; 14130caa102dSLi Zefan } 14140caa102dSLi Zefan 14150caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 14160caa102dSLi Zefan void __user *arg) 14170caa102dSLi Zefan { 1418496ad9aaSAl Viro struct inode *inode = file_inode(file); 14190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14200caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 14210caa102dSLi Zefan struct btrfs_trans_handle *trans; 14220caa102dSLi Zefan u64 root_flags; 14230caa102dSLi Zefan u64 flags; 14240caa102dSLi Zefan int ret = 0; 14250caa102dSLi Zefan 142601beba79SChristian Brauner if (!inode_owner_or_capable(file_mnt_idmap(file), inode)) 1427bd60ea0fSDavid Sterba return -EPERM; 1428bd60ea0fSDavid Sterba 1429b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1430b9ca0664SLiu Bo if (ret) 1431b9ca0664SLiu Bo goto out; 14320caa102dSLi Zefan 14334a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1434b9ca0664SLiu Bo ret = -EINVAL; 1435b9ca0664SLiu Bo goto out_drop_write; 1436b9ca0664SLiu Bo } 14370caa102dSLi Zefan 1438b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1439b9ca0664SLiu Bo ret = -EFAULT; 1440b9ca0664SLiu Bo goto out_drop_write; 1441b9ca0664SLiu Bo } 14420caa102dSLi Zefan 1443b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1444b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1445b9ca0664SLiu Bo goto out_drop_write; 1446b9ca0664SLiu Bo } 14470caa102dSLi Zefan 14480b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 14490caa102dSLi Zefan 14500caa102dSLi Zefan /* nothing to do */ 14510caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 1452b9ca0664SLiu Bo goto out_drop_sem; 14530caa102dSLi Zefan 14540caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 14552c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 14560caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14570caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 14582c686537SDavid Sterba } else { 14592c686537SDavid Sterba /* 14602c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 14612c686537SDavid Sterba * send 14622c686537SDavid Sterba */ 14632c686537SDavid Sterba spin_lock(&root->root_item_lock); 14642c686537SDavid Sterba if (root->send_in_progress == 0) { 14650caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 14660caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 14672c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14682c686537SDavid Sterba } else { 14692c686537SDavid Sterba spin_unlock(&root->root_item_lock); 14700b246afaSJeff Mahoney btrfs_warn(fs_info, 14712c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 14722c686537SDavid Sterba root->root_key.objectid); 14732c686537SDavid Sterba ret = -EPERM; 14742c686537SDavid Sterba goto out_drop_sem; 14752c686537SDavid Sterba } 14762c686537SDavid Sterba } 14770caa102dSLi Zefan 14780caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 14790caa102dSLi Zefan if (IS_ERR(trans)) { 14800caa102dSLi Zefan ret = PTR_ERR(trans); 14810caa102dSLi Zefan goto out_reset; 14820caa102dSLi Zefan } 14830caa102dSLi Zefan 14840b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 14850caa102dSLi Zefan &root->root_key, &root->root_item); 14869417ebc8SNikolay Borisov if (ret < 0) { 14879417ebc8SNikolay Borisov btrfs_end_transaction(trans); 14889417ebc8SNikolay Borisov goto out_reset; 14899417ebc8SNikolay Borisov } 14900caa102dSLi Zefan 14919417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 14929417ebc8SNikolay Borisov 14930caa102dSLi Zefan out_reset: 14940caa102dSLi Zefan if (ret) 14950caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 1496b9ca0664SLiu Bo out_drop_sem: 14970b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 1498b9ca0664SLiu Bo out_drop_write: 1499b9ca0664SLiu Bo mnt_drop_write_file(file); 1500b9ca0664SLiu Bo out: 15010caa102dSLi Zefan return ret; 15020caa102dSLi Zefan } 15030caa102dSLi Zefan 1504ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1505ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1506ac8e9819SChris Mason { 1507abc6e134SChris Mason struct btrfs_key test; 1508abc6e134SChris Mason int ret; 1509abc6e134SChris Mason 1510abc6e134SChris Mason test.objectid = sk->min_objectid; 1511abc6e134SChris Mason test.type = sk->min_type; 1512abc6e134SChris Mason test.offset = sk->min_offset; 1513abc6e134SChris Mason 1514abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1515abc6e134SChris Mason if (ret < 0) 1516ac8e9819SChris Mason return 0; 1517abc6e134SChris Mason 1518abc6e134SChris Mason test.objectid = sk->max_objectid; 1519abc6e134SChris Mason test.type = sk->max_type; 1520abc6e134SChris Mason test.offset = sk->max_offset; 1521abc6e134SChris Mason 1522abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1523abc6e134SChris Mason if (ret > 0) 1524ac8e9819SChris Mason return 0; 1525ac8e9819SChris Mason return 1; 1526ac8e9819SChris Mason } 1527ac8e9819SChris Mason 1528df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 1529ac8e9819SChris Mason struct btrfs_key *key, 1530ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 15319b6e817dSGerhard Heift size_t *buf_size, 1532ba346b35SGerhard Heift char __user *ubuf, 1533ac8e9819SChris Mason unsigned long *sk_offset, 1534ac8e9819SChris Mason int *num_found) 1535ac8e9819SChris Mason { 1536ac8e9819SChris Mason u64 found_transid; 1537ac8e9819SChris Mason struct extent_buffer *leaf; 1538ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1539dd81d459SNaohiro Aota struct btrfs_key test; 1540ac8e9819SChris Mason unsigned long item_off; 1541ac8e9819SChris Mason unsigned long item_len; 1542ac8e9819SChris Mason int nritems; 1543ac8e9819SChris Mason int i; 1544ac8e9819SChris Mason int slot; 1545ac8e9819SChris Mason int ret = 0; 1546ac8e9819SChris Mason 1547ac8e9819SChris Mason leaf = path->nodes[0]; 1548ac8e9819SChris Mason slot = path->slots[0]; 1549ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1550ac8e9819SChris Mason 1551ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1552ac8e9819SChris Mason i = nritems; 1553ac8e9819SChris Mason goto advance_key; 1554ac8e9819SChris Mason } 1555ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1556ac8e9819SChris Mason 1557ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1558ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 15593212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 1560ac8e9819SChris Mason 156103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 156203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 156303b71c6cSGabriel de Perthuis continue; 156403b71c6cSGabriel de Perthuis 15659b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 15668f5f6178SGerhard Heift if (*num_found) { 1567ac8e9819SChris Mason ret = 1; 15688f5f6178SGerhard Heift goto out; 15698f5f6178SGerhard Heift } 15708f5f6178SGerhard Heift 15718f5f6178SGerhard Heift /* 15728f5f6178SGerhard Heift * return one empty item back for v1, which does not 15738f5f6178SGerhard Heift * handle -EOVERFLOW 15748f5f6178SGerhard Heift */ 15758f5f6178SGerhard Heift 15769b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 1577ac8e9819SChris Mason item_len = 0; 15788f5f6178SGerhard Heift ret = -EOVERFLOW; 15798f5f6178SGerhard Heift } 1580ac8e9819SChris Mason 15819b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 1582ac8e9819SChris Mason ret = 1; 158325c9bc2eSGerhard Heift goto out; 1584ac8e9819SChris Mason } 1585ac8e9819SChris Mason 1586ac8e9819SChris Mason sh.objectid = key->objectid; 1587ac8e9819SChris Mason sh.offset = key->offset; 1588ac8e9819SChris Mason sh.type = key->type; 1589ac8e9819SChris Mason sh.len = item_len; 1590ac8e9819SChris Mason sh.transid = found_transid; 1591ac8e9819SChris Mason 1592a48b73ecSJosef Bacik /* 1593a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 1594a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 1595a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 1596a48b73ecSJosef Bacik * properly this next time through 1597a48b73ecSJosef Bacik */ 1598a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 1599a48b73ecSJosef Bacik ret = 0; 1600ba346b35SGerhard Heift goto out; 1601ba346b35SGerhard Heift } 1602ba346b35SGerhard Heift 1603ac8e9819SChris Mason *sk_offset += sizeof(sh); 1604ac8e9819SChris Mason 1605ac8e9819SChris Mason if (item_len) { 1606ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 1607a48b73ecSJosef Bacik /* 1608a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 1609a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 1610a48b73ecSJosef Bacik */ 1611a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 1612ba346b35SGerhard Heift item_off, item_len)) { 1613a48b73ecSJosef Bacik ret = 0; 1614a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 1615ba346b35SGerhard Heift goto out; 1616ba346b35SGerhard Heift } 1617ba346b35SGerhard Heift 1618ac8e9819SChris Mason *sk_offset += item_len; 1619ac8e9819SChris Mason } 1620e2156867SHugo Mills (*num_found)++; 1621ac8e9819SChris Mason 16228f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 16238f5f6178SGerhard Heift goto out; 16248f5f6178SGerhard Heift 162525c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 162625c9bc2eSGerhard Heift ret = 1; 162725c9bc2eSGerhard Heift goto out; 162825c9bc2eSGerhard Heift } 1629ac8e9819SChris Mason } 1630ac8e9819SChris Mason advance_key: 1631ac8e9819SChris Mason ret = 0; 1632dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 1633dd81d459SNaohiro Aota test.type = sk->max_type; 1634dd81d459SNaohiro Aota test.offset = sk->max_offset; 1635dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 1636dd81d459SNaohiro Aota ret = 1; 1637dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 1638abc6e134SChris Mason key->offset++; 1639dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 1640abc6e134SChris Mason key->offset = 0; 1641abc6e134SChris Mason key->type++; 1642dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 1643abc6e134SChris Mason key->offset = 0; 1644abc6e134SChris Mason key->type = 0; 1645abc6e134SChris Mason key->objectid++; 1646abc6e134SChris Mason } else 1647abc6e134SChris Mason ret = 1; 164825c9bc2eSGerhard Heift out: 1649ba346b35SGerhard Heift /* 1650ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 1651ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 1652ba346b35SGerhard Heift * * all items were found 1653ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 1654ba346b35SGerhard Heift * leaf 1655ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 1656ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 1657ba346b35SGerhard Heift */ 1658ac8e9819SChris Mason return ret; 1659ac8e9819SChris Mason } 1660ac8e9819SChris Mason 1661ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 166212544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 16639b6e817dSGerhard Heift size_t *buf_size, 1664ba346b35SGerhard Heift char __user *ubuf) 1665ac8e9819SChris Mason { 16660b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 1667ac8e9819SChris Mason struct btrfs_root *root; 1668ac8e9819SChris Mason struct btrfs_key key; 1669ac8e9819SChris Mason struct btrfs_path *path; 1670ac8e9819SChris Mason int ret; 1671ac8e9819SChris Mason int num_found = 0; 1672ac8e9819SChris Mason unsigned long sk_offset = 0; 1673ac8e9819SChris Mason 16749b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 16759b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 167612544442SGerhard Heift return -EOVERFLOW; 16779b6e817dSGerhard Heift } 167812544442SGerhard Heift 1679ac8e9819SChris Mason path = btrfs_alloc_path(); 1680ac8e9819SChris Mason if (!path) 1681ac8e9819SChris Mason return -ENOMEM; 1682ac8e9819SChris Mason 1683ac8e9819SChris Mason if (sk->tree_id == 0) { 1684ac8e9819SChris Mason /* search the root of the inode that was passed */ 168500246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 1686ac8e9819SChris Mason } else { 168756e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 1688ac8e9819SChris Mason if (IS_ERR(root)) { 1689ac8e9819SChris Mason btrfs_free_path(path); 1690ad1e3d56SMisono Tomohiro return PTR_ERR(root); 1691ac8e9819SChris Mason } 1692ac8e9819SChris Mason } 1693ac8e9819SChris Mason 1694ac8e9819SChris Mason key.objectid = sk->min_objectid; 1695ac8e9819SChris Mason key.type = sk->min_type; 1696ac8e9819SChris Mason key.offset = sk->min_offset; 1697ac8e9819SChris Mason 1698ac8e9819SChris Mason while (1) { 1699bb523b40SAndreas Gruenbacher ret = -EFAULT; 170018788e34SCatalin Marinas /* 170118788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 170218788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 170318788e34SCatalin Marinas */ 170418788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 170518788e34SCatalin Marinas *buf_size - sk_offset)) 1706a48b73ecSJosef Bacik break; 1707a48b73ecSJosef Bacik 17086174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 1709ac8e9819SChris Mason if (ret != 0) { 1710ac8e9819SChris Mason if (ret > 0) 1711ac8e9819SChris Mason ret = 0; 1712ac8e9819SChris Mason goto err; 1713ac8e9819SChris Mason } 1714df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 1715ac8e9819SChris Mason &sk_offset, &num_found); 1716b3b4aa74SDavid Sterba btrfs_release_path(path); 171725c9bc2eSGerhard Heift if (ret) 1718ac8e9819SChris Mason break; 1719ac8e9819SChris Mason 1720ac8e9819SChris Mason } 17218f5f6178SGerhard Heift if (ret > 0) 1722ac8e9819SChris Mason ret = 0; 1723ac8e9819SChris Mason err: 1724ac8e9819SChris Mason sk->nr_items = num_found; 172500246528SJosef Bacik btrfs_put_root(root); 1726ac8e9819SChris Mason btrfs_free_path(path); 1727ac8e9819SChris Mason return ret; 1728ac8e9819SChris Mason } 1729ac8e9819SChris Mason 17309ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 1731ac8e9819SChris Mason void __user *argp) 1732ac8e9819SChris Mason { 17330d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 1734ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 1735ac8e9819SChris Mason int ret; 17369b6e817dSGerhard Heift size_t buf_size; 1737ac8e9819SChris Mason 1738ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1739ac8e9819SChris Mason return -EPERM; 1740ac8e9819SChris Mason 1741ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 1742ba346b35SGerhard Heift return -EFAULT; 1743ba346b35SGerhard Heift 1744ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 1745ac8e9819SChris Mason 1746ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 17478f5f6178SGerhard Heift 17488f5f6178SGerhard Heift /* 17498f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 17508f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 17518f5f6178SGerhard Heift */ 17528f5f6178SGerhard Heift if (ret == -EOVERFLOW) 17538f5f6178SGerhard Heift ret = 0; 17548f5f6178SGerhard Heift 1755ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 1756ac8e9819SChris Mason ret = -EFAULT; 1757ac8e9819SChris Mason return ret; 1758ac8e9819SChris Mason } 1759ac8e9819SChris Mason 17609ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 1761cc68a8a5SGerhard Heift void __user *argp) 1762cc68a8a5SGerhard Heift { 17630d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 1764cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 1765cc68a8a5SGerhard Heift int ret; 1766cc68a8a5SGerhard Heift size_t buf_size; 1767ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 1768cc68a8a5SGerhard Heift 1769cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 1770cc68a8a5SGerhard Heift return -EPERM; 1771cc68a8a5SGerhard Heift 1772cc68a8a5SGerhard Heift /* copy search header and buffer size */ 1773cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 1774cc68a8a5SGerhard Heift return -EFAULT; 1775cc68a8a5SGerhard Heift 1776cc68a8a5SGerhard Heift buf_size = args.buf_size; 1777cc68a8a5SGerhard Heift 1778cc68a8a5SGerhard Heift /* limit result size to 16MB */ 1779cc68a8a5SGerhard Heift if (buf_size > buf_limit) 1780cc68a8a5SGerhard Heift buf_size = buf_limit; 1781cc68a8a5SGerhard Heift 1782cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 1783718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 1784cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 1785cc68a8a5SGerhard Heift ret = -EFAULT; 1786cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 1787cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 1788cc68a8a5SGerhard Heift ret = -EFAULT; 1789cc68a8a5SGerhard Heift 179076dda93cSYan, Zheng return ret; 179176dda93cSYan, Zheng } 179276dda93cSYan, Zheng 179398d377a0STARUISI Hiroaki /* 1794ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1795ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 179698d377a0STARUISI Hiroaki */ 179798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 179898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 179998d377a0STARUISI Hiroaki { 180098d377a0STARUISI Hiroaki struct btrfs_root *root; 180198d377a0STARUISI Hiroaki struct btrfs_key key; 1802ac8e9819SChris Mason char *ptr; 180398d377a0STARUISI Hiroaki int ret = -1; 180498d377a0STARUISI Hiroaki int slot; 180598d377a0STARUISI Hiroaki int len; 180698d377a0STARUISI Hiroaki int total_len = 0; 180798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 180898d377a0STARUISI Hiroaki struct extent_buffer *l; 180998d377a0STARUISI Hiroaki struct btrfs_path *path; 181098d377a0STARUISI Hiroaki 181198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 181298d377a0STARUISI Hiroaki name[0]='\0'; 181398d377a0STARUISI Hiroaki return 0; 181498d377a0STARUISI Hiroaki } 181598d377a0STARUISI Hiroaki 181698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 181798d377a0STARUISI Hiroaki if (!path) 181898d377a0STARUISI Hiroaki return -ENOMEM; 181998d377a0STARUISI Hiroaki 1820c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 182198d377a0STARUISI Hiroaki 182256e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 182398d377a0STARUISI Hiroaki if (IS_ERR(root)) { 1824ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 182588234012SJosef Bacik root = NULL; 182688234012SJosef Bacik goto out; 182788234012SJosef Bacik } 182898d377a0STARUISI Hiroaki 182998d377a0STARUISI Hiroaki key.objectid = dirid; 183098d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 18318ad6fcabSChris Mason key.offset = (u64)-1; 183298d377a0STARUISI Hiroaki 183398d377a0STARUISI Hiroaki while (1) { 18340ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 183518674c6cSFilipe David Borba Manana if (ret < 0) 183618674c6cSFilipe David Borba Manana goto out; 183718674c6cSFilipe David Borba Manana else if (ret > 0) { 1838ac8e9819SChris Mason ret = -ENOENT; 183998d377a0STARUISI Hiroaki goto out; 1840ac8e9819SChris Mason } 184118674c6cSFilipe David Borba Manana 184218674c6cSFilipe David Borba Manana l = path->nodes[0]; 184318674c6cSFilipe David Borba Manana slot = path->slots[0]; 184498d377a0STARUISI Hiroaki 184598d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 184698d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 184798d377a0STARUISI Hiroaki ptr -= len + 1; 184898d377a0STARUISI Hiroaki total_len += len + 1; 1849a696cf35SFilipe David Borba Manana if (ptr < name) { 1850a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 185198d377a0STARUISI Hiroaki goto out; 1852a696cf35SFilipe David Borba Manana } 185398d377a0STARUISI Hiroaki 185498d377a0STARUISI Hiroaki *(ptr + len) = '/'; 185598d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 185698d377a0STARUISI Hiroaki 185798d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 185898d377a0STARUISI Hiroaki break; 185998d377a0STARUISI Hiroaki 1860b3b4aa74SDavid Sterba btrfs_release_path(path); 186198d377a0STARUISI Hiroaki key.objectid = key.offset; 18628ad6fcabSChris Mason key.offset = (u64)-1; 186398d377a0STARUISI Hiroaki dirid = key.objectid; 186498d377a0STARUISI Hiroaki } 186577906a50SLi Zefan memmove(name, ptr, total_len); 186698d377a0STARUISI Hiroaki name[total_len] = '\0'; 186798d377a0STARUISI Hiroaki ret = 0; 186898d377a0STARUISI Hiroaki out: 186900246528SJosef Bacik btrfs_put_root(root); 187098d377a0STARUISI Hiroaki btrfs_free_path(path); 1871ac8e9819SChris Mason return ret; 1872ac8e9819SChris Mason } 1873ac8e9819SChris Mason 18744609e1f1SChristian Brauner static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap, 18756623d9a0SChristian Brauner struct inode *inode, 187623d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 187723d0b79dSTomohiro Misono { 187823d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 187923d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 188023d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 188123d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 188223d0b79dSTomohiro Misono u64 dirid = args->dirid; 188323d0b79dSTomohiro Misono unsigned long item_off; 188423d0b79dSTomohiro Misono unsigned long item_len; 188523d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 188623d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 1887b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 188823d0b79dSTomohiro Misono struct btrfs_path *path; 188923d0b79dSTomohiro Misono struct btrfs_key key, key2; 189023d0b79dSTomohiro Misono struct extent_buffer *leaf; 189123d0b79dSTomohiro Misono struct inode *temp_inode; 189223d0b79dSTomohiro Misono char *ptr; 189323d0b79dSTomohiro Misono int slot; 189423d0b79dSTomohiro Misono int len; 189523d0b79dSTomohiro Misono int total_len = 0; 189623d0b79dSTomohiro Misono int ret; 189723d0b79dSTomohiro Misono 189823d0b79dSTomohiro Misono path = btrfs_alloc_path(); 189923d0b79dSTomohiro Misono if (!path) 190023d0b79dSTomohiro Misono return -ENOMEM; 190123d0b79dSTomohiro Misono 190223d0b79dSTomohiro Misono /* 190323d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 190423d0b79dSTomohiro Misono * construct the path in from the bottom up. 190523d0b79dSTomohiro Misono */ 190623d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 190723d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 190823d0b79dSTomohiro Misono 190956e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 191023d0b79dSTomohiro Misono if (IS_ERR(root)) { 191123d0b79dSTomohiro Misono ret = PTR_ERR(root); 191223d0b79dSTomohiro Misono goto out; 191323d0b79dSTomohiro Misono } 191423d0b79dSTomohiro Misono 191523d0b79dSTomohiro Misono key.objectid = dirid; 191623d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 191723d0b79dSTomohiro Misono key.offset = (u64)-1; 191823d0b79dSTomohiro Misono while (1) { 19190ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 19200ff40a91SMarcos Paulo de Souza if (ret < 0) 1921b8a49ae1SJosef Bacik goto out_put; 19220ff40a91SMarcos Paulo de Souza else if (ret > 0) { 192323d0b79dSTomohiro Misono ret = -ENOENT; 1924b8a49ae1SJosef Bacik goto out_put; 192523d0b79dSTomohiro Misono } 192623d0b79dSTomohiro Misono 192723d0b79dSTomohiro Misono leaf = path->nodes[0]; 192823d0b79dSTomohiro Misono slot = path->slots[0]; 192923d0b79dSTomohiro Misono 193023d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 193123d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 193223d0b79dSTomohiro Misono ptr -= len + 1; 193323d0b79dSTomohiro Misono total_len += len + 1; 193423d0b79dSTomohiro Misono if (ptr < args->path) { 193523d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 1936b8a49ae1SJosef Bacik goto out_put; 193723d0b79dSTomohiro Misono } 193823d0b79dSTomohiro Misono 193923d0b79dSTomohiro Misono *(ptr + len) = '/'; 194023d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 194123d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 194223d0b79dSTomohiro Misono 194323d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 194423d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 194523d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 194623d0b79dSTomohiro Misono if (ret < 0) { 1947b8a49ae1SJosef Bacik goto out_put; 194823d0b79dSTomohiro Misono } else if (ret > 0) { 194923d0b79dSTomohiro Misono ret = -ENOENT; 1950b8a49ae1SJosef Bacik goto out_put; 195123d0b79dSTomohiro Misono } 195223d0b79dSTomohiro Misono 195323d0b79dSTomohiro Misono leaf = path->nodes[0]; 195423d0b79dSTomohiro Misono slot = path->slots[0]; 195523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 195623d0b79dSTomohiro Misono if (key2.objectid != dirid) { 195723d0b79dSTomohiro Misono ret = -ENOENT; 1958b8a49ae1SJosef Bacik goto out_put; 195923d0b79dSTomohiro Misono } 196023d0b79dSTomohiro Misono 19610202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 19623ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 19633ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 1964b8a49ae1SJosef Bacik goto out_put; 19653ca57bd6SMisono Tomohiro } 19664609e1f1SChristian Brauner ret = inode_permission(idmap, temp_inode, 196747291baaSChristian Brauner MAY_READ | MAY_EXEC); 196823d0b79dSTomohiro Misono iput(temp_inode); 196923d0b79dSTomohiro Misono if (ret) { 197023d0b79dSTomohiro Misono ret = -EACCES; 1971b8a49ae1SJosef Bacik goto out_put; 197223d0b79dSTomohiro Misono } 197323d0b79dSTomohiro Misono 197423d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 197523d0b79dSTomohiro Misono break; 197623d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 197723d0b79dSTomohiro Misono ret = -EACCES; 1978b8a49ae1SJosef Bacik goto out_put; 197923d0b79dSTomohiro Misono } 198023d0b79dSTomohiro Misono 198123d0b79dSTomohiro Misono btrfs_release_path(path); 198223d0b79dSTomohiro Misono key.objectid = key.offset; 198323d0b79dSTomohiro Misono key.offset = (u64)-1; 198423d0b79dSTomohiro Misono dirid = key.objectid; 198523d0b79dSTomohiro Misono } 198623d0b79dSTomohiro Misono 198723d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 198823d0b79dSTomohiro Misono args->path[total_len] = '\0'; 198900246528SJosef Bacik btrfs_put_root(root); 1990b8a49ae1SJosef Bacik root = NULL; 199123d0b79dSTomohiro Misono btrfs_release_path(path); 199223d0b79dSTomohiro Misono } 199323d0b79dSTomohiro Misono 199423d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 199523d0b79dSTomohiro Misono key.objectid = treeid; 199623d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 199723d0b79dSTomohiro Misono key.offset = args->treeid; 1998b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 199923d0b79dSTomohiro Misono if (ret < 0) { 200023d0b79dSTomohiro Misono goto out; 200123d0b79dSTomohiro Misono } else if (ret > 0) { 200223d0b79dSTomohiro Misono ret = -ENOENT; 200323d0b79dSTomohiro Misono goto out; 200423d0b79dSTomohiro Misono } 200523d0b79dSTomohiro Misono 200623d0b79dSTomohiro Misono leaf = path->nodes[0]; 200723d0b79dSTomohiro Misono slot = path->slots[0]; 200823d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 200923d0b79dSTomohiro Misono 201023d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 20113212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 201223d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 201323d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 201423d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 201523d0b79dSTomohiro Misono ret = -EINVAL; 201623d0b79dSTomohiro Misono goto out; 201723d0b79dSTomohiro Misono } 201823d0b79dSTomohiro Misono 201923d0b79dSTomohiro Misono /* Copy subvolume's name */ 202023d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 202123d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 202223d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 202323d0b79dSTomohiro Misono args->name[item_len] = 0; 202423d0b79dSTomohiro Misono 2025b8a49ae1SJosef Bacik out_put: 202600246528SJosef Bacik btrfs_put_root(root); 202723d0b79dSTomohiro Misono out: 202823d0b79dSTomohiro Misono btrfs_free_path(path); 202923d0b79dSTomohiro Misono return ret; 203023d0b79dSTomohiro Misono } 203123d0b79dSTomohiro Misono 2032dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2033ac8e9819SChris Mason void __user *argp) 2034ac8e9819SChris Mason { 2035ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 203601b810b8SDavid Sterba int ret = 0; 2037ac8e9819SChris Mason 20382354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 20392354d08fSJulia Lawall if (IS_ERR(args)) 20402354d08fSJulia Lawall return PTR_ERR(args); 2041c2b96929SDan Carpenter 204201b810b8SDavid Sterba /* 204301b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 204401b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 204501b810b8SDavid Sterba */ 20461b53ac4dSChris Mason if (args->treeid == 0) 2047dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 20481b53ac4dSChris Mason 204901b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 205001b810b8SDavid Sterba args->name[0] = 0; 205101b810b8SDavid Sterba goto out; 205201b810b8SDavid Sterba } 205301b810b8SDavid Sterba 205401b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 205501b810b8SDavid Sterba ret = -EPERM; 205601b810b8SDavid Sterba goto out; 205701b810b8SDavid Sterba } 205801b810b8SDavid Sterba 2059dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2060ac8e9819SChris Mason args->treeid, args->objectid, 2061ac8e9819SChris Mason args->name); 2062ac8e9819SChris Mason 206301b810b8SDavid Sterba out: 2064ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2065ac8e9819SChris Mason ret = -EFAULT; 2066ac8e9819SChris Mason 2067ac8e9819SChris Mason kfree(args); 206898d377a0STARUISI Hiroaki return ret; 206998d377a0STARUISI Hiroaki } 207098d377a0STARUISI Hiroaki 207123d0b79dSTomohiro Misono /* 207223d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 207323d0b79dSTomohiro Misono * 207423d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 207523d0b79dSTomohiro Misono * 207623d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 207723d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 207823d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 207923d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 208023d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 208123d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 208223d0b79dSTomohiro Misono */ 208323d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 208423d0b79dSTomohiro Misono { 208523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 208623d0b79dSTomohiro Misono struct inode *inode; 208723d0b79dSTomohiro Misono int ret; 208823d0b79dSTomohiro Misono 208923d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 209023d0b79dSTomohiro Misono if (IS_ERR(args)) 209123d0b79dSTomohiro Misono return PTR_ERR(args); 209223d0b79dSTomohiro Misono 209323d0b79dSTomohiro Misono inode = file_inode(file); 209423d0b79dSTomohiro Misono 209523d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 209623d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 209723d0b79dSTomohiro Misono /* 209823d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 209923d0b79dSTomohiro Misono * called 210023d0b79dSTomohiro Misono */ 210123d0b79dSTomohiro Misono kfree(args); 210223d0b79dSTomohiro Misono return -EACCES; 210323d0b79dSTomohiro Misono } 210423d0b79dSTomohiro Misono 21054609e1f1SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args); 210623d0b79dSTomohiro Misono 210723d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 210823d0b79dSTomohiro Misono ret = -EFAULT; 210923d0b79dSTomohiro Misono 211023d0b79dSTomohiro Misono kfree(args); 211123d0b79dSTomohiro Misono return ret; 211223d0b79dSTomohiro Misono } 211323d0b79dSTomohiro Misono 2114b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 21159ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 2116b64ec075STomohiro Misono { 2117b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2118b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2119b64ec075STomohiro Misono struct btrfs_root *root; 2120b64ec075STomohiro Misono struct btrfs_path *path; 2121b64ec075STomohiro Misono struct btrfs_key key; 2122b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2123b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2124b64ec075STomohiro Misono struct extent_buffer *leaf; 2125b64ec075STomohiro Misono unsigned long item_off; 2126b64ec075STomohiro Misono unsigned long item_len; 2127b64ec075STomohiro Misono int slot; 2128b64ec075STomohiro Misono int ret = 0; 2129b64ec075STomohiro Misono 2130b64ec075STomohiro Misono path = btrfs_alloc_path(); 2131b64ec075STomohiro Misono if (!path) 2132b64ec075STomohiro Misono return -ENOMEM; 2133b64ec075STomohiro Misono 2134b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2135b64ec075STomohiro Misono if (!subvol_info) { 2136b64ec075STomohiro Misono btrfs_free_path(path); 2137b64ec075STomohiro Misono return -ENOMEM; 2138b64ec075STomohiro Misono } 2139b64ec075STomohiro Misono 2140b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2141b64ec075STomohiro Misono 2142b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2143b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 214456e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2145b64ec075STomohiro Misono if (IS_ERR(root)) { 2146b64ec075STomohiro Misono ret = PTR_ERR(root); 214704734e84SJosef Bacik goto out_free; 214804734e84SJosef Bacik } 2149b64ec075STomohiro Misono root_item = &root->root_item; 2150b64ec075STomohiro Misono 2151b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2152b64ec075STomohiro Misono 2153b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2154b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2155b64ec075STomohiro Misono 2156b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2157b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2158b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2159b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2160b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2161b64ec075STomohiro Misono 2162b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2163b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2164b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2165b64ec075STomohiro Misono 2166b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2167b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2168b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2169b64ec075STomohiro Misono 2170b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2171b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2172b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2173b64ec075STomohiro Misono 2174b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2175b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2176b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2177b64ec075STomohiro Misono 2178b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2179b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2180b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2181b64ec075STomohiro Misono key.offset = 0; 218204734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2183b64ec075STomohiro Misono if (ret < 0) { 2184b64ec075STomohiro Misono goto out; 2185b64ec075STomohiro Misono } else if (path->slots[0] >= 2186b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 218704734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2188b64ec075STomohiro Misono if (ret < 0) { 2189b64ec075STomohiro Misono goto out; 2190b64ec075STomohiro Misono } else if (ret > 0) { 2191b64ec075STomohiro Misono ret = -EUCLEAN; 2192b64ec075STomohiro Misono goto out; 2193b64ec075STomohiro Misono } 2194b64ec075STomohiro Misono } 2195b64ec075STomohiro Misono 2196b64ec075STomohiro Misono leaf = path->nodes[0]; 2197b64ec075STomohiro Misono slot = path->slots[0]; 2198b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2199b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2200b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2201b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2202b64ec075STomohiro Misono 2203b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2204b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2205b64ec075STomohiro Misono 2206b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2207b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 22083212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 2209b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2210b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2211b64ec075STomohiro Misono item_off, item_len); 2212b64ec075STomohiro Misono } else { 2213b64ec075STomohiro Misono ret = -ENOENT; 2214b64ec075STomohiro Misono goto out; 2215b64ec075STomohiro Misono } 2216b64ec075STomohiro Misono } 2217b64ec075STomohiro Misono 2218013c1c55SAnand Jain btrfs_free_path(path); 2219013c1c55SAnand Jain path = NULL; 2220b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2221b64ec075STomohiro Misono ret = -EFAULT; 2222b64ec075STomohiro Misono 2223b64ec075STomohiro Misono out: 222400246528SJosef Bacik btrfs_put_root(root); 222504734e84SJosef Bacik out_free: 2226b64ec075STomohiro Misono btrfs_free_path(path); 2227b091f7feSWaiman Long kfree(subvol_info); 2228b64ec075STomohiro Misono return ret; 2229b64ec075STomohiro Misono } 2230b64ec075STomohiro Misono 223142e4b520STomohiro Misono /* 223242e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 223342e4b520STomohiro Misono * except the subvolume name. 223442e4b520STomohiro Misono */ 22359ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 2236dc408ccdSSahil Kang void __user *argp) 223742e4b520STomohiro Misono { 223842e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 223942e4b520STomohiro Misono struct btrfs_root_ref *rref; 224042e4b520STomohiro Misono struct btrfs_path *path; 224142e4b520STomohiro Misono struct btrfs_key key; 224242e4b520STomohiro Misono struct extent_buffer *leaf; 224342e4b520STomohiro Misono u64 objectid; 224442e4b520STomohiro Misono int slot; 224542e4b520STomohiro Misono int ret; 224642e4b520STomohiro Misono u8 found; 224742e4b520STomohiro Misono 224842e4b520STomohiro Misono path = btrfs_alloc_path(); 224942e4b520STomohiro Misono if (!path) 225042e4b520STomohiro Misono return -ENOMEM; 225142e4b520STomohiro Misono 225242e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 225342e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 225442e4b520STomohiro Misono btrfs_free_path(path); 225542e4b520STomohiro Misono return PTR_ERR(rootrefs); 225642e4b520STomohiro Misono } 225742e4b520STomohiro Misono 22589ad12305SSahil Kang objectid = root->root_key.objectid; 225942e4b520STomohiro Misono key.objectid = objectid; 226042e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 226142e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 226242e4b520STomohiro Misono found = 0; 226342e4b520STomohiro Misono 22649ad12305SSahil Kang root = root->fs_info->tree_root; 226542e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 226642e4b520STomohiro Misono if (ret < 0) { 226742e4b520STomohiro Misono goto out; 226842e4b520STomohiro Misono } else if (path->slots[0] >= 226942e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 227042e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 227142e4b520STomohiro Misono if (ret < 0) { 227242e4b520STomohiro Misono goto out; 227342e4b520STomohiro Misono } else if (ret > 0) { 227442e4b520STomohiro Misono ret = -EUCLEAN; 227542e4b520STomohiro Misono goto out; 227642e4b520STomohiro Misono } 227742e4b520STomohiro Misono } 227842e4b520STomohiro Misono while (1) { 227942e4b520STomohiro Misono leaf = path->nodes[0]; 228042e4b520STomohiro Misono slot = path->slots[0]; 228142e4b520STomohiro Misono 228242e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 228342e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 228442e4b520STomohiro Misono ret = 0; 228542e4b520STomohiro Misono goto out; 228642e4b520STomohiro Misono } 228742e4b520STomohiro Misono 228842e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 228942e4b520STomohiro Misono ret = -EOVERFLOW; 229042e4b520STomohiro Misono goto out; 229142e4b520STomohiro Misono } 229242e4b520STomohiro Misono 229342e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 229442e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 229542e4b520STomohiro Misono rootrefs->rootref[found].dirid = 229642e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 229742e4b520STomohiro Misono found++; 229842e4b520STomohiro Misono 229942e4b520STomohiro Misono ret = btrfs_next_item(root, path); 230042e4b520STomohiro Misono if (ret < 0) { 230142e4b520STomohiro Misono goto out; 230242e4b520STomohiro Misono } else if (ret > 0) { 230342e4b520STomohiro Misono ret = -EUCLEAN; 230442e4b520STomohiro Misono goto out; 230542e4b520STomohiro Misono } 230642e4b520STomohiro Misono } 230742e4b520STomohiro Misono 230842e4b520STomohiro Misono out: 2309b740d806SJosef Bacik btrfs_free_path(path); 2310b740d806SJosef Bacik 231142e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 231242e4b520STomohiro Misono rootrefs->num_items = found; 231342e4b520STomohiro Misono /* update min_treeid for next search */ 231442e4b520STomohiro Misono if (found) 231542e4b520STomohiro Misono rootrefs->min_treeid = 231642e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 231742e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 231842e4b520STomohiro Misono ret = -EFAULT; 231942e4b520STomohiro Misono } 232042e4b520STomohiro Misono 232142e4b520STomohiro Misono kfree(rootrefs); 232242e4b520STomohiro Misono 232342e4b520STomohiro Misono return ret; 232442e4b520STomohiro Misono } 232542e4b520STomohiro Misono 232676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2327949964c9SMarcos Paulo de Souza void __user *arg, 2328949964c9SMarcos Paulo de Souza bool destroy_v2) 232976dda93cSYan, Zheng { 233054563d41SAl Viro struct dentry *parent = file->f_path.dentry; 23310b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 233276dda93cSYan, Zheng struct dentry *dentry; 23332b0143b5SDavid Howells struct inode *dir = d_inode(parent); 233476dda93cSYan, Zheng struct inode *inode; 233576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 233676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2337949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2338949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 23394609e1f1SChristian Brauner struct mnt_idmap *idmap = file_mnt_idmap(file); 2340949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2341949964c9SMarcos Paulo de Souza int subvol_namelen; 234276dda93cSYan, Zheng int err = 0; 2343949964c9SMarcos Paulo de Souza bool destroy_parent = false; 234476dda93cSYan, Zheng 2345813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 2346813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2347813febdbSJosef Bacik btrfs_err(fs_info, 2348813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 2349813febdbSJosef Bacik return -EOPNOTSUPP; 2350813febdbSJosef Bacik } 2351813febdbSJosef Bacik 2352949964c9SMarcos Paulo de Souza if (destroy_v2) { 2353949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2354949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2355949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2356325c50e3SJeff Mahoney 2357949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2358949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2359949964c9SMarcos Paulo de Souza goto out; 2360949964c9SMarcos Paulo de Souza } 236176dda93cSYan, Zheng 2362949964c9SMarcos Paulo de Souza /* 2363949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2364949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2365949964c9SMarcos Paulo de Souza */ 2366949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2367949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2368949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2369949964c9SMarcos Paulo de Souza 2370949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2371949964c9SMarcos Paulo de Souza if (err) 2372949964c9SMarcos Paulo de Souza goto out; 2373949964c9SMarcos Paulo de Souza } else { 2374aabb34e7SChristian Brauner struct inode *old_dir; 2375c4ed533bSChristian Brauner 2376949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 237776dda93cSYan, Zheng err = -EINVAL; 237876dda93cSYan, Zheng goto out; 237976dda93cSYan, Zheng } 238076dda93cSYan, Zheng 2381a561be71SAl Viro err = mnt_want_write_file(file); 238276dda93cSYan, Zheng if (err) 238376dda93cSYan, Zheng goto out; 238476dda93cSYan, Zheng 2385949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2386949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2387b307f06dSDavid Sterba vol_args2->subvolid, 0); 2388949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2389949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2390949964c9SMarcos Paulo de Souza goto out_drop_write; 2391949964c9SMarcos Paulo de Souza } 2392949964c9SMarcos Paulo de Souza 2393949964c9SMarcos Paulo de Souza /* 2394949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2395949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2396949964c9SMarcos Paulo de Souza */ 2397949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2398949964c9SMarcos Paulo de Souza 2399949964c9SMarcos Paulo de Souza /* 2400949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2401949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2402949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2403949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2404949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2405949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2406949964c9SMarcos Paulo de Souza */ 2407949964c9SMarcos Paulo de Souza dput(dentry); 2408949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2409949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2410949964c9SMarcos Paulo de Souza goto out_drop_write; 2411949964c9SMarcos Paulo de Souza } 2412aabb34e7SChristian Brauner old_dir = dir; 2413949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2414949964c9SMarcos Paulo de Souza 2415949964c9SMarcos Paulo de Souza /* 2416949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2417949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2418949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2419949964c9SMarcos Paulo de Souza * new parent dentry. 2420949964c9SMarcos Paulo de Souza */ 2421949964c9SMarcos Paulo de Souza destroy_parent = true; 2422949964c9SMarcos Paulo de Souza 2423aabb34e7SChristian Brauner /* 2424aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 2425aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 2426aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 2427aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 2428aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 2429aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 2430aabb34e7SChristian Brauner * to delete without an idmapped mount. 2431aabb34e7SChristian Brauner */ 24324609e1f1SChristian Brauner if (old_dir != dir && idmap != &nop_mnt_idmap) { 2433aabb34e7SChristian Brauner err = -EOPNOTSUPP; 2434aabb34e7SChristian Brauner goto free_parent; 2435aabb34e7SChristian Brauner } 2436aabb34e7SChristian Brauner 2437949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2438949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2439949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2440949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2441949964c9SMarcos Paulo de Souza goto free_parent; 2442949964c9SMarcos Paulo de Souza } 24431a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 2444949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2445949964c9SMarcos Paulo de Souza } 2446949964c9SMarcos Paulo de Souza } else { 2447949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2448949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2449949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2450949964c9SMarcos Paulo de Souza 2451949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 2452949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 2453949964c9SMarcos Paulo de Souza 2454949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2455949964c9SMarcos Paulo de Souza if (err) 2456949964c9SMarcos Paulo de Souza goto out; 2457949964c9SMarcos Paulo de Souza } 2458949964c9SMarcos Paulo de Souza 2459949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 2460949964c9SMarcos Paulo de Souza 2461949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 2462949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 2463949964c9SMarcos Paulo de Souza err = -EINVAL; 2464949964c9SMarcos Paulo de Souza goto free_subvol_name; 2465949964c9SMarcos Paulo de Souza } 2466949964c9SMarcos Paulo de Souza 2467949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 2468949964c9SMarcos Paulo de Souza err = -ENOTDIR; 2469949964c9SMarcos Paulo de Souza goto free_subvol_name; 2470949964c9SMarcos Paulo de Souza } 2471521e0546SDavid Sterba 247200235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 247300235411SAl Viro if (err == -EINTR) 2474949964c9SMarcos Paulo de Souza goto free_subvol_name; 24754609e1f1SChristian Brauner dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen); 247676dda93cSYan, Zheng if (IS_ERR(dentry)) { 247776dda93cSYan, Zheng err = PTR_ERR(dentry); 247876dda93cSYan, Zheng goto out_unlock_dir; 247976dda93cSYan, Zheng } 248076dda93cSYan, Zheng 24812b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 248276dda93cSYan, Zheng err = -ENOENT; 248376dda93cSYan, Zheng goto out_dput; 248476dda93cSYan, Zheng } 248576dda93cSYan, Zheng 24862b0143b5SDavid Howells inode = d_inode(dentry); 24874260f7c7SSage Weil dest = BTRFS_I(inode)->root; 24884260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 24894260f7c7SSage Weil /* 24904260f7c7SSage Weil * Regular user. Only allow this with a special mount 24914260f7c7SSage Weil * option, when the user has write+exec access to the 24924260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 24934260f7c7SSage Weil * allowed. 24944260f7c7SSage Weil * 24954260f7c7SSage Weil * Note that this is _not_ check that the subvol is 24964260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 24974260f7c7SSage Weil * otherwise be able to delete. 24984260f7c7SSage Weil * 24994260f7c7SSage Weil * Users who want to delete empty subvols should try 25004260f7c7SSage Weil * rmdir(2). 25014260f7c7SSage Weil */ 25024260f7c7SSage Weil err = -EPERM; 25030b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 25044260f7c7SSage Weil goto out_dput; 25054260f7c7SSage Weil 25064260f7c7SSage Weil /* 25074260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 25084260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 25094260f7c7SSage Weil * must be called on the dentry referencing the root 25104260f7c7SSage Weil * of the subvol, not a random directory contained 25114260f7c7SSage Weil * within it. 25124260f7c7SSage Weil */ 25134260f7c7SSage Weil err = -EINVAL; 25144260f7c7SSage Weil if (root == dest) 25154260f7c7SSage Weil goto out_dput; 25164260f7c7SSage Weil 25174609e1f1SChristian Brauner err = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC); 25184260f7c7SSage Weil if (err) 25194260f7c7SSage Weil goto out_dput; 25205c39da5bSMiao Xie } 25214260f7c7SSage Weil 25225c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 25234609e1f1SChristian Brauner err = btrfs_may_delete(idmap, dir, dentry, 1); 25244260f7c7SSage Weil if (err) 25254260f7c7SSage Weil goto out_dput; 25264260f7c7SSage Weil 25274a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 252876dda93cSYan, Zheng err = -EINVAL; 252976dda93cSYan, Zheng goto out_dput; 253076dda93cSYan, Zheng } 253176dda93cSYan, Zheng 253229b6352bSDavid Sterba btrfs_inode_lock(BTRFS_I(inode), 0); 25333c4f91e2SDavid Sterba err = btrfs_delete_subvolume(BTRFS_I(dir), dentry); 2534e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(inode), 0); 2535a37d9a17SAmir Goldstein if (!err) 2536a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 2537fa6ac876SLiu Bo 253876dda93cSYan, Zheng out_dput: 253976dda93cSYan, Zheng dput(dentry); 254076dda93cSYan, Zheng out_unlock_dir: 2541e5d4d75bSDavid Sterba btrfs_inode_unlock(BTRFS_I(dir), 0); 2542949964c9SMarcos Paulo de Souza free_subvol_name: 2543949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 2544949964c9SMarcos Paulo de Souza free_parent: 2545949964c9SMarcos Paulo de Souza if (destroy_parent) 2546949964c9SMarcos Paulo de Souza dput(parent); 254700235411SAl Viro out_drop_write: 25482a79f17eSAl Viro mnt_drop_write_file(file); 254976dda93cSYan, Zheng out: 2550949964c9SMarcos Paulo de Souza kfree(vol_args2); 255176dda93cSYan, Zheng kfree(vol_args); 255276dda93cSYan, Zheng return err; 255376dda93cSYan, Zheng } 255476dda93cSYan, Zheng 25551e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 2556f46b5a66SChristoph Hellwig { 2557496ad9aaSAl Viro struct inode *inode = file_inode(file); 2558f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2559c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 2560c146afadSYan Zheng int ret; 2561c146afadSYan Zheng 256225122d15SIlya Dryomov ret = mnt_want_write_file(file); 256325122d15SIlya Dryomov if (ret) 256425122d15SIlya Dryomov return ret; 2565b83cc969SLi Zefan 256625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 256725122d15SIlya Dryomov ret = -EROFS; 256825122d15SIlya Dryomov goto out; 25695ac00addSStefan Behrens } 2570f46b5a66SChristoph Hellwig 2571f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 2572f46b5a66SChristoph Hellwig case S_IFDIR: 2573e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 2574e441d54dSChris Mason ret = -EPERM; 2575e441d54dSChris Mason goto out; 2576e441d54dSChris Mason } 2577de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 2578f46b5a66SChristoph Hellwig break; 2579f46b5a66SChristoph Hellwig case S_IFREG: 2580616d374eSAdam Borowski /* 2581616d374eSAdam Borowski * Note that this does not check the file descriptor for write 2582616d374eSAdam Borowski * access. This prevents defragmenting executables that are 2583616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 2584616d374eSAdam Borowski */ 2585616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 25864609e1f1SChristian Brauner inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) { 2587616d374eSAdam Borowski ret = -EPERM; 2588e441d54dSChris Mason goto out; 2589e441d54dSChris Mason } 25901e701a32SChris Mason 25911e701a32SChris Mason if (argp) { 2592c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 25931e701a32SChris Mason ret = -EFAULT; 2594683be16eSDan Carpenter goto out; 25951e701a32SChris Mason } 25961e701a32SChris Mason /* compression requires us to start the IO */ 2597c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 2598c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 2599c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 26001e701a32SChris Mason } 26011e701a32SChris Mason } else { 26021e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 2603c853a578SGoldwyn Rodrigues range.len = (u64)-1; 26041e701a32SChris Mason } 26051ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 2606c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 26074cb5300bSChris Mason if (ret > 0) 26084cb5300bSChris Mason ret = 0; 2609f46b5a66SChristoph Hellwig break; 26108929ecfaSYan, Zheng default: 26118929ecfaSYan, Zheng ret = -EINVAL; 2612f46b5a66SChristoph Hellwig } 2613e441d54dSChris Mason out: 261425122d15SIlya Dryomov mnt_drop_write_file(file); 2615e441d54dSChris Mason return ret; 2616f46b5a66SChristoph Hellwig } 2617f46b5a66SChristoph Hellwig 26182ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 2619f46b5a66SChristoph Hellwig { 2620f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 2621a174c0a2SNikolay Borisov bool restore_op = false; 2622f46b5a66SChristoph Hellwig int ret; 2623f46b5a66SChristoph Hellwig 2624e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2625e441d54dSChris Mason return -EPERM; 2626e441d54dSChris Mason 2627914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 2628914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 2629914a519bSJosef Bacik return -EINVAL; 2630914a519bSJosef Bacik } 2631914a519bSJosef Bacik 2632a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 2633a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 2634e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 2635c9e9f97bSIlya Dryomov 2636a174c0a2SNikolay Borisov /* 2637a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 2638a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 2639a174c0a2SNikolay Borisov * back the paused balance 2640a174c0a2SNikolay Borisov */ 2641a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 2642a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 2643a174c0a2SNikolay Borisov restore_op = true; 2644a174c0a2SNikolay Borisov } 2645a174c0a2SNikolay Borisov 2646dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2647c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2648c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2649c9e9f97bSIlya Dryomov goto out; 2650c9e9f97bSIlya Dryomov } 2651f46b5a66SChristoph Hellwig 26525516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 26532ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 2654f46b5a66SChristoph Hellwig 265543d20761SAnand Jain if (!ret) 26560b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 265743d20761SAnand Jain 2658f46b5a66SChristoph Hellwig kfree(vol_args); 2659c9e9f97bSIlya Dryomov out: 2660a174c0a2SNikolay Borisov if (restore_op) 2661a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 2662a174c0a2SNikolay Borisov else 2663c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2664f46b5a66SChristoph Hellwig return ret; 2665f46b5a66SChristoph Hellwig } 2666f46b5a66SChristoph Hellwig 26676b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 2668f46b5a66SChristoph Hellwig { 26691a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 26700b246afaSJeff Mahoney struct inode *inode = file_inode(file); 26710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 26726b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 26733fa421deSJosef Bacik struct block_device *bdev = NULL; 26743fa421deSJosef Bacik fmode_t mode; 2675f46b5a66SChristoph Hellwig int ret; 267667ae34b6SDavid Sterba bool cancel = false; 2677f46b5a66SChristoph Hellwig 2678e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2679e441d54dSChris Mason return -EPERM; 2680e441d54dSChris Mason 2681dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2682d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 2683d815b3f2SDan Carpenter return PTR_ERR(vol_args); 2684f46b5a66SChristoph Hellwig 2685748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 2686fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 2687fd4e994bSOmar Sandoval goto out; 2688fd4e994bSOmar Sandoval } 26891a15eb72SJosef Bacik 26906b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 26911a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 26921a15eb72SJosef Bacik args.devid = vol_args->devid; 26931a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 269467ae34b6SDavid Sterba cancel = true; 26951a15eb72SJosef Bacik } else { 26961a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 26971a15eb72SJosef Bacik if (ret) 26981a15eb72SJosef Bacik goto out; 26991a15eb72SJosef Bacik } 27001a15eb72SJosef Bacik 27011a15eb72SJosef Bacik ret = mnt_want_write_file(file); 27021a15eb72SJosef Bacik if (ret) 27031a15eb72SJosef Bacik goto out; 270467ae34b6SDavid Sterba 270567ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 270667ae34b6SDavid Sterba cancel); 270767ae34b6SDavid Sterba if (ret) 27081a15eb72SJosef Bacik goto err_drop; 270967ae34b6SDavid Sterba 27101a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 27111a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 271267ae34b6SDavid Sterba 2713c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 2714183860f6SAnand Jain 27156b526ed7SAnand Jain if (!ret) { 2716735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 27170b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 27186b526ed7SAnand Jain vol_args->devid); 27196b526ed7SAnand Jain else 27200b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 27216b526ed7SAnand Jain vol_args->name); 27226b526ed7SAnand Jain } 2723c47ca32dSDan Carpenter err_drop: 27244ac20c70SIlya Dryomov mnt_drop_write_file(file); 27253fa421deSJosef Bacik if (bdev) 27263fa421deSJosef Bacik blkdev_put(bdev, mode); 27271a15eb72SJosef Bacik out: 27281a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27291a15eb72SJosef Bacik kfree(vol_args); 2730f46b5a66SChristoph Hellwig return ret; 2731f46b5a66SChristoph Hellwig } 2732f46b5a66SChristoph Hellwig 2733f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 2734f46b5a66SChristoph Hellwig { 27351a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 27360b246afaSJeff Mahoney struct inode *inode = file_inode(file); 27370b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2738f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 27393fa421deSJosef Bacik struct block_device *bdev = NULL; 27403fa421deSJosef Bacik fmode_t mode; 2741f46b5a66SChristoph Hellwig int ret; 274237b45995STom Rix bool cancel = false; 2743f46b5a66SChristoph Hellwig 2744f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2745f46b5a66SChristoph Hellwig return -EPERM; 2746f46b5a66SChristoph Hellwig 27471a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 27481a15eb72SJosef Bacik if (IS_ERR(vol_args)) 27491a15eb72SJosef Bacik return PTR_ERR(vol_args); 27501a15eb72SJosef Bacik 27511a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 27521a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 27531a15eb72SJosef Bacik cancel = true; 27541a15eb72SJosef Bacik } else { 27551a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 27561a15eb72SJosef Bacik if (ret) 27571a15eb72SJosef Bacik goto out; 27581a15eb72SJosef Bacik } 27591a15eb72SJosef Bacik 2760f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 2761f46b5a66SChristoph Hellwig if (ret) 27621a15eb72SJosef Bacik goto out; 2763f46b5a66SChristoph Hellwig 276467ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 276567ae34b6SDavid Sterba cancel); 276667ae34b6SDavid Sterba if (ret == 0) { 27671a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 2768f46b5a66SChristoph Hellwig if (!ret) 27690b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 2770c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 277167ae34b6SDavid Sterba } 277267ae34b6SDavid Sterba 2773f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 27743fa421deSJosef Bacik if (bdev) 27753fa421deSJosef Bacik blkdev_put(bdev, mode); 27761a15eb72SJosef Bacik out: 27771a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 27781a15eb72SJosef Bacik kfree(vol_args); 2779f46b5a66SChristoph Hellwig return ret; 2780f46b5a66SChristoph Hellwig } 2781f46b5a66SChristoph Hellwig 27822ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 27832ff7e61eSJeff Mahoney void __user *arg) 2784475f6387SJan Schmidt { 2785027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 2786475f6387SJan Schmidt struct btrfs_device *device; 27870b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 2788137c5418SJohannes Thumshirn u64 flags_in; 2789027ed2f0SLi Zefan int ret = 0; 2790475f6387SJan Schmidt 2791137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 2792137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 2793137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 2794137c5418SJohannes Thumshirn 2795137c5418SJohannes Thumshirn flags_in = fi_args->flags; 2796137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 2797027ed2f0SLi Zefan 2798d03262c7SDavid Sterba rcu_read_lock(); 2799027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 2800475f6387SJan Schmidt 2801d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2802027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 2803027ed2f0SLi Zefan fi_args->max_id = device->devid; 2804475f6387SJan Schmidt } 2805d03262c7SDavid Sterba rcu_read_unlock(); 2806475f6387SJan Schmidt 2807de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 2808bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 2809bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 2810bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 281180a773fbSDavid Sterba 2812137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 2813137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 2814137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 2815137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 2816137c5418SJohannes Thumshirn } 2817137c5418SJohannes Thumshirn 28180fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 28190fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 28200fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 28210fb408a5SJohannes Thumshirn } 28220fb408a5SJohannes Thumshirn 282349bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 282449bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 282549bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 282649bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 282749bac897SJohannes Thumshirn } 282849bac897SJohannes Thumshirn 2829027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 2830027ed2f0SLi Zefan ret = -EFAULT; 2831475f6387SJan Schmidt 2832027ed2f0SLi Zefan kfree(fi_args); 2833027ed2f0SLi Zefan return ret; 2834475f6387SJan Schmidt } 2835475f6387SJan Schmidt 28362ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 28372ff7e61eSJeff Mahoney void __user *arg) 2838475f6387SJan Schmidt { 2839562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 2840475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 2841475f6387SJan Schmidt struct btrfs_device *dev; 2842475f6387SJan Schmidt int ret = 0; 2843475f6387SJan Schmidt 2844475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 2845475f6387SJan Schmidt if (IS_ERR(di_args)) 2846475f6387SJan Schmidt return PTR_ERR(di_args); 2847475f6387SJan Schmidt 2848562d7b15SJosef Bacik args.devid = di_args->devid; 2849dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 2850562d7b15SJosef Bacik args.uuid = di_args->uuid; 2851475f6387SJan Schmidt 2852c5593ca3SDavid Sterba rcu_read_lock(); 2853562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 2854475f6387SJan Schmidt if (!dev) { 2855475f6387SJan Schmidt ret = -ENODEV; 2856475f6387SJan Schmidt goto out; 2857475f6387SJan Schmidt } 2858475f6387SJan Schmidt 2859475f6387SJan Schmidt di_args->devid = dev->devid; 28607cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 28617cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 2862475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 28632943868aSQu Wenruo memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); 286463d5429fSArtem Chernyshev if (dev->name) 286563d5429fSArtem Chernyshev strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); 286663d5429fSArtem Chernyshev else 286799ba55adSStefan Behrens di_args->path[0] = '\0'; 2868475f6387SJan Schmidt 2869475f6387SJan Schmidt out: 2870c5593ca3SDavid Sterba rcu_read_unlock(); 2871475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 2872475f6387SJan Schmidt ret = -EFAULT; 2873475f6387SJan Schmidt 2874475f6387SJan Schmidt kfree(di_args); 2875475f6387SJan Schmidt return ret; 2876475f6387SJan Schmidt } 2877475f6387SJan Schmidt 28786ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 28796ef5ed0dSJosef Bacik { 2880496ad9aaSAl Viro struct inode *inode = file_inode(file); 28810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 28826ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 28836ef5ed0dSJosef Bacik struct btrfs_root *new_root; 28846ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 28856ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 28862a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 28876ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 28886db75318SSweet Tea Dorminy struct fscrypt_str name = FSTR_INIT("default", 7); 28896ef5ed0dSJosef Bacik u64 objectid = 0; 28906ef5ed0dSJosef Bacik u64 dir_id; 28913c04ce01SMiao Xie int ret; 28926ef5ed0dSJosef Bacik 28936ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 28946ef5ed0dSJosef Bacik return -EPERM; 28956ef5ed0dSJosef Bacik 28963c04ce01SMiao Xie ret = mnt_want_write_file(file); 28973c04ce01SMiao Xie if (ret) 28983c04ce01SMiao Xie return ret; 28993c04ce01SMiao Xie 29003c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 29013c04ce01SMiao Xie ret = -EFAULT; 29023c04ce01SMiao Xie goto out; 29033c04ce01SMiao Xie } 29046ef5ed0dSJosef Bacik 29056ef5ed0dSJosef Bacik if (!objectid) 29061cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 29076ef5ed0dSJosef Bacik 290856e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 29093c04ce01SMiao Xie if (IS_ERR(new_root)) { 29103c04ce01SMiao Xie ret = PTR_ERR(new_root); 29113c04ce01SMiao Xie goto out; 29123c04ce01SMiao Xie } 29132a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 29142a2b5d62SJosef Bacik ret = -ENOENT; 29152a2b5d62SJosef Bacik goto out_free; 29162a2b5d62SJosef Bacik } 29176ef5ed0dSJosef Bacik 29186ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 29193c04ce01SMiao Xie if (!path) { 29203c04ce01SMiao Xie ret = -ENOMEM; 29212a2b5d62SJosef Bacik goto out_free; 29223c04ce01SMiao Xie } 29236ef5ed0dSJosef Bacik 29246ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 292598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 29263c04ce01SMiao Xie ret = PTR_ERR(trans); 29272a2b5d62SJosef Bacik goto out_free; 29286ef5ed0dSJosef Bacik } 29296ef5ed0dSJosef Bacik 29300b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 29310b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 2932e43eec81SSweet Tea Dorminy dir_id, &name, 1); 2933cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 29342a2b5d62SJosef Bacik btrfs_release_path(path); 29353a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29360b246afaSJeff Mahoney btrfs_err(fs_info, 29375d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 29383c04ce01SMiao Xie ret = -ENOENT; 29392a2b5d62SJosef Bacik goto out_free; 29406ef5ed0dSJosef Bacik } 29416ef5ed0dSJosef Bacik 29426ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 29436ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 29446ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 29452a2b5d62SJosef Bacik btrfs_release_path(path); 29466ef5ed0dSJosef Bacik 29470b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 29483a45bb20SJeff Mahoney btrfs_end_transaction(trans); 29492a2b5d62SJosef Bacik out_free: 295000246528SJosef Bacik btrfs_put_root(new_root); 29512a2b5d62SJosef Bacik btrfs_free_path(path); 29523c04ce01SMiao Xie out: 29533c04ce01SMiao Xie mnt_drop_write_file(file); 29543c04ce01SMiao Xie return ret; 29556ef5ed0dSJosef Bacik } 29566ef5ed0dSJosef Bacik 2957c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 2958bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2959bf5fc093SJosef Bacik { 296032da5386SDavid Sterba struct btrfs_block_group *block_group; 2961bf5fc093SJosef Bacik 2962bf5fc093SJosef Bacik space->total_bytes = 0; 2963bf5fc093SJosef Bacik space->used_bytes = 0; 2964bf5fc093SJosef Bacik space->flags = 0; 2965bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2966bf5fc093SJosef Bacik space->flags = block_group->flags; 2967b3470b5dSDavid Sterba space->total_bytes += block_group->length; 2968bf38be65SDavid Sterba space->used_bytes += block_group->used; 2969bf5fc093SJosef Bacik } 2970bf5fc093SJosef Bacik } 2971bf5fc093SJosef Bacik 29722ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 29732ff7e61eSJeff Mahoney void __user *arg) 29741406e432SJosef Bacik { 29751406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 29761406e432SJosef Bacik struct btrfs_ioctl_space_info space; 29771406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 29787fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 297913f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 29801406e432SJosef Bacik struct btrfs_space_info *info; 2981315d8e98SColin Ian King static const u64 types[] = { 2982315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 2983bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2984bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2985315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 2986315d8e98SColin Ian King }; 2987bf5fc093SJosef Bacik int num_types = 4; 29887fde62bfSChris Mason int alloc_size; 29891406e432SJosef Bacik int ret = 0; 299051788b1bSDan Rosenberg u64 slot_count = 0; 2991bf5fc093SJosef Bacik int i, c; 29921406e432SJosef Bacik 29931406e432SJosef Bacik if (copy_from_user(&space_args, 29941406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 29951406e432SJosef Bacik sizeof(space_args))) 29961406e432SJosef Bacik return -EFAULT; 29971406e432SJosef Bacik 2998bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2999bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3000bf5fc093SJosef Bacik 3001bf5fc093SJosef Bacik info = NULL; 300272804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3003bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3004bf5fc093SJosef Bacik info = tmp; 3005bf5fc093SJosef Bacik break; 3006bf5fc093SJosef Bacik } 3007bf5fc093SJosef Bacik } 30081406e432SJosef Bacik 3009bf5fc093SJosef Bacik if (!info) 3010bf5fc093SJosef Bacik continue; 3011bf5fc093SJosef Bacik 3012bf5fc093SJosef Bacik down_read(&info->groups_sem); 3013bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3014bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3015bf5fc093SJosef Bacik slot_count++; 3016bf5fc093SJosef Bacik } 3017bf5fc093SJosef Bacik up_read(&info->groups_sem); 3018bf5fc093SJosef Bacik } 3019bf5fc093SJosef Bacik 302036523e95SDavid Sterba /* 302136523e95SDavid Sterba * Global block reserve, exported as a space_info 302236523e95SDavid Sterba */ 302336523e95SDavid Sterba slot_count++; 302436523e95SDavid Sterba 30257fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 30267fde62bfSChris Mason if (space_args.space_slots == 0) { 30277fde62bfSChris Mason space_args.total_spaces = slot_count; 30287fde62bfSChris Mason goto out; 30297fde62bfSChris Mason } 3030bf5fc093SJosef Bacik 303151788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3032bf5fc093SJosef Bacik 30337fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3034bf5fc093SJosef Bacik 30357fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 30367fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 30377fde62bfSChris Mason */ 303809cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 30397fde62bfSChris Mason return -ENOMEM; 30407fde62bfSChris Mason 30417fde62bfSChris Mason space_args.total_spaces = 0; 30428d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 30437fde62bfSChris Mason if (!dest) 30447fde62bfSChris Mason return -ENOMEM; 30457fde62bfSChris Mason dest_orig = dest; 30467fde62bfSChris Mason 30477fde62bfSChris Mason /* now we have a buffer to copy into */ 3048bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3049bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3050bf5fc093SJosef Bacik 305151788b1bSDan Rosenberg if (!slot_count) 305251788b1bSDan Rosenberg break; 305351788b1bSDan Rosenberg 3054bf5fc093SJosef Bacik info = NULL; 305572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3056bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3057bf5fc093SJosef Bacik info = tmp; 30587fde62bfSChris Mason break; 3059bf5fc093SJosef Bacik } 3060bf5fc093SJosef Bacik } 30617fde62bfSChris Mason 3062bf5fc093SJosef Bacik if (!info) 3063bf5fc093SJosef Bacik continue; 3064bf5fc093SJosef Bacik down_read(&info->groups_sem); 3065bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3066bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3067c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3068c065f5b1SSu Yue &space); 30697fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 30701406e432SJosef Bacik dest++; 30711406e432SJosef Bacik space_args.total_spaces++; 307251788b1bSDan Rosenberg slot_count--; 30731406e432SJosef Bacik } 307451788b1bSDan Rosenberg if (!slot_count) 307551788b1bSDan Rosenberg break; 3076bf5fc093SJosef Bacik } 3077bf5fc093SJosef Bacik up_read(&info->groups_sem); 3078bf5fc093SJosef Bacik } 30791406e432SJosef Bacik 308036523e95SDavid Sterba /* 308136523e95SDavid Sterba * Add global block reserve 308236523e95SDavid Sterba */ 308336523e95SDavid Sterba if (slot_count) { 30840b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 308536523e95SDavid Sterba 308636523e95SDavid Sterba spin_lock(&block_rsv->lock); 308736523e95SDavid Sterba space.total_bytes = block_rsv->size; 308836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 308936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 309036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 309136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 309236523e95SDavid Sterba space_args.total_spaces++; 309336523e95SDavid Sterba } 309436523e95SDavid Sterba 30952eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 30967fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 30977fde62bfSChris Mason 30987fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 30997fde62bfSChris Mason ret = -EFAULT; 31007fde62bfSChris Mason 31017fde62bfSChris Mason kfree(dest_orig); 31027fde62bfSChris Mason out: 31037fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 31041406e432SJosef Bacik ret = -EFAULT; 31051406e432SJosef Bacik 31061406e432SJosef Bacik return ret; 31071406e432SJosef Bacik } 31081406e432SJosef Bacik 31099a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 31109a8c28beSMiao Xie void __user *argp) 311146204592SSage Weil { 311246204592SSage Weil struct btrfs_trans_handle *trans; 311346204592SSage Weil u64 transid; 311446204592SSage Weil 3115d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3116ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3117ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 311898d5dc13STsutomu Itoh return PTR_ERR(trans); 3119ff7c1d33SMiao Xie 3120ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3121ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3122ff7c1d33SMiao Xie goto out; 3123ff7c1d33SMiao Xie } 312446204592SSage Weil transid = trans->transid; 3125fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 3126ff7c1d33SMiao Xie out: 312746204592SSage Weil if (argp) 312846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 312946204592SSage Weil return -EFAULT; 313046204592SSage Weil return 0; 313146204592SSage Weil } 313246204592SSage Weil 31332ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 31349a8c28beSMiao Xie void __user *argp) 313546204592SSage Weil { 313646204592SSage Weil u64 transid; 313746204592SSage Weil 313846204592SSage Weil if (argp) { 313946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 314046204592SSage Weil return -EFAULT; 314146204592SSage Weil } else { 314246204592SSage Weil transid = 0; /* current trans */ 314346204592SSage Weil } 31442ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 314546204592SSage Weil } 314646204592SSage Weil 3147b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3148475f6387SJan Schmidt { 31490b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3150475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3151b8e95489SMiao Xie int ret; 3152475f6387SJan Schmidt 3153475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3154475f6387SJan Schmidt return -EPERM; 3155475f6387SJan Schmidt 3156da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3157da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 3158da32c6d5SJosef Bacik return -EINVAL; 3159da32c6d5SJosef Bacik } 3160da32c6d5SJosef Bacik 3161475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3162475f6387SJan Schmidt if (IS_ERR(sa)) 3163475f6387SJan Schmidt return PTR_ERR(sa); 3164475f6387SJan Schmidt 3165604e6681SQu Wenruo if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) { 3166604e6681SQu Wenruo ret = -EOPNOTSUPP; 3167604e6681SQu Wenruo goto out; 3168604e6681SQu Wenruo } 3169604e6681SQu Wenruo 3170b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3171b8e95489SMiao Xie ret = mnt_want_write_file(file); 3172b8e95489SMiao Xie if (ret) 3173b8e95489SMiao Xie goto out; 3174b8e95489SMiao Xie } 3175b8e95489SMiao Xie 31760b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 317763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 317863a212abSStefan Behrens 0); 3179475f6387SJan Schmidt 31805afe6ce7SFilipe Manana /* 31815afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 31825afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 31835afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 31845afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 31855afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 31865afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 31875afe6ce7SFilipe Manana * previously (btrfs-progs does this). 31885afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 31895afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 31905afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 31915afe6ce7SFilipe Manana */ 31925afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3193475f6387SJan Schmidt ret = -EFAULT; 3194475f6387SJan Schmidt 3195b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3196b8e95489SMiao Xie mnt_drop_write_file(file); 3197b8e95489SMiao Xie out: 3198475f6387SJan Schmidt kfree(sa); 3199475f6387SJan Schmidt return ret; 3200475f6387SJan Schmidt } 3201475f6387SJan Schmidt 32022ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3203475f6387SJan Schmidt { 3204475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3205475f6387SJan Schmidt return -EPERM; 3206475f6387SJan Schmidt 32072ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3208475f6387SJan Schmidt } 3209475f6387SJan Schmidt 32102ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3211475f6387SJan Schmidt void __user *arg) 3212475f6387SJan Schmidt { 3213475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3214475f6387SJan Schmidt int ret; 3215475f6387SJan Schmidt 3216475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3217475f6387SJan Schmidt return -EPERM; 3218475f6387SJan Schmidt 3219475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3220475f6387SJan Schmidt if (IS_ERR(sa)) 3221475f6387SJan Schmidt return PTR_ERR(sa); 3222475f6387SJan Schmidt 32232ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3224475f6387SJan Schmidt 32254fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3226475f6387SJan Schmidt ret = -EFAULT; 3227475f6387SJan Schmidt 3228475f6387SJan Schmidt kfree(sa); 3229475f6387SJan Schmidt return ret; 3230475f6387SJan Schmidt } 3231475f6387SJan Schmidt 32322ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3233b27f7c0cSDavid Sterba void __user *arg) 3234c11d2c23SStefan Behrens { 3235c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3236c11d2c23SStefan Behrens int ret; 3237c11d2c23SStefan Behrens 3238c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3239c11d2c23SStefan Behrens if (IS_ERR(sa)) 3240c11d2c23SStefan Behrens return PTR_ERR(sa); 3241c11d2c23SStefan Behrens 3242b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3243b27f7c0cSDavid Sterba kfree(sa); 3244b27f7c0cSDavid Sterba return -EPERM; 3245b27f7c0cSDavid Sterba } 3246b27f7c0cSDavid Sterba 32472ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3248c11d2c23SStefan Behrens 3249eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3250c11d2c23SStefan Behrens ret = -EFAULT; 3251c11d2c23SStefan Behrens 3252c11d2c23SStefan Behrens kfree(sa); 3253c11d2c23SStefan Behrens return ret; 3254c11d2c23SStefan Behrens } 3255c11d2c23SStefan Behrens 32562ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 32572ff7e61eSJeff Mahoney void __user *arg) 32583f6bcfbdSStefan Behrens { 32593f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 32603f6bcfbdSStefan Behrens int ret; 32613f6bcfbdSStefan Behrens 32623f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 32633f6bcfbdSStefan Behrens return -EPERM; 32643f6bcfbdSStefan Behrens 3265914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3266914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 3267914a519bSJosef Bacik return -EINVAL; 3268914a519bSJosef Bacik } 3269914a519bSJosef Bacik 32703f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 32713f6bcfbdSStefan Behrens if (IS_ERR(p)) 32723f6bcfbdSStefan Behrens return PTR_ERR(p); 32733f6bcfbdSStefan Behrens 32743f6bcfbdSStefan Behrens switch (p->cmd) { 32753f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3276bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3277adfa97cbSIlya Dryomov ret = -EROFS; 3278adfa97cbSIlya Dryomov goto out; 3279adfa97cbSIlya Dryomov } 3280c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3281e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 32823f6bcfbdSStefan Behrens } else { 32832ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3284c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 32853f6bcfbdSStefan Behrens } 32863f6bcfbdSStefan Behrens break; 32873f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 32880b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 32893f6bcfbdSStefan Behrens ret = 0; 32903f6bcfbdSStefan Behrens break; 32913f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 329217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 329397282031SAnand Jain ret = 0; 32943f6bcfbdSStefan Behrens break; 32953f6bcfbdSStefan Behrens default: 32963f6bcfbdSStefan Behrens ret = -EINVAL; 32973f6bcfbdSStefan Behrens break; 32983f6bcfbdSStefan Behrens } 32993f6bcfbdSStefan Behrens 3300d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 33013f6bcfbdSStefan Behrens ret = -EFAULT; 3302adfa97cbSIlya Dryomov out: 33033f6bcfbdSStefan Behrens kfree(p); 33043f6bcfbdSStefan Behrens return ret; 33053f6bcfbdSStefan Behrens } 33063f6bcfbdSStefan Behrens 3307d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3308d7728c96SJan Schmidt { 3309d7728c96SJan Schmidt int ret = 0; 3310d7728c96SJan Schmidt int i; 3311740c3d22SChris Mason u64 rel_ptr; 3312d7728c96SJan Schmidt int size; 3313806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3314d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3315d7728c96SJan Schmidt struct btrfs_path *path; 3316d7728c96SJan Schmidt 331782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3318d7728c96SJan Schmidt return -EPERM; 3319d7728c96SJan Schmidt 3320d7728c96SJan Schmidt path = btrfs_alloc_path(); 3321d7728c96SJan Schmidt if (!path) { 3322d7728c96SJan Schmidt ret = -ENOMEM; 3323d7728c96SJan Schmidt goto out; 3324d7728c96SJan Schmidt } 3325d7728c96SJan Schmidt 3326d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3327d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3328d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3329d7728c96SJan Schmidt ipa = NULL; 3330d7728c96SJan Schmidt goto out; 3331d7728c96SJan Schmidt } 3332d7728c96SJan Schmidt 3333d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3334d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3335d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3336d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3337d7728c96SJan Schmidt ipath = NULL; 3338d7728c96SJan Schmidt goto out; 3339d7728c96SJan Schmidt } 3340d7728c96SJan Schmidt 3341d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3342d7728c96SJan Schmidt if (ret < 0) 3343d7728c96SJan Schmidt goto out; 3344d7728c96SJan Schmidt 3345d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3346745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3347745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3348740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3349d7728c96SJan Schmidt } 3350d7728c96SJan Schmidt 33518cf96b40SAnand Jain btrfs_free_path(path); 33528cf96b40SAnand Jain path = NULL; 3353718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3354718dc5faSOmar Sandoval ipath->fspath, size); 3355d7728c96SJan Schmidt if (ret) { 3356d7728c96SJan Schmidt ret = -EFAULT; 3357d7728c96SJan Schmidt goto out; 3358d7728c96SJan Schmidt } 3359d7728c96SJan Schmidt 3360d7728c96SJan Schmidt out: 3361d7728c96SJan Schmidt btrfs_free_path(path); 3362d7728c96SJan Schmidt free_ipath(ipath); 3363d7728c96SJan Schmidt kfree(ipa); 3364d7728c96SJan Schmidt 3365d7728c96SJan Schmidt return ret; 3366d7728c96SJan Schmidt } 3367d7728c96SJan Schmidt 33682ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3369d24a67b2SZygo Blaxell void __user *arg, int version) 3370d7728c96SJan Schmidt { 3371d7728c96SJan Schmidt int ret = 0; 3372d7728c96SJan Schmidt int size; 3373d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3374d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3375d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3376d24a67b2SZygo Blaxell bool ignore_offset; 3377d7728c96SJan Schmidt 3378d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3379d7728c96SJan Schmidt return -EPERM; 3380d7728c96SJan Schmidt 3381d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 33827b9ea627SShailendra Verma if (IS_ERR(loi)) 33837b9ea627SShailendra Verma return PTR_ERR(loi); 3384d7728c96SJan Schmidt 3385d24a67b2SZygo Blaxell if (version == 1) { 3386d24a67b2SZygo Blaxell ignore_offset = false; 3387b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3388d24a67b2SZygo Blaxell } else { 3389d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3390d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3391d24a67b2SZygo Blaxell ret = -EINVAL; 3392d24a67b2SZygo Blaxell goto out_loi; 3393d24a67b2SZygo Blaxell } 3394d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3395d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3396d24a67b2SZygo Blaxell ret = -EINVAL; 3397d24a67b2SZygo Blaxell goto out_loi; 3398d24a67b2SZygo Blaxell } 3399d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3400b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3401d24a67b2SZygo Blaxell } 3402d24a67b2SZygo Blaxell 3403418ffb9eSAnand Jain inodes = init_data_container(size); 3404418ffb9eSAnand Jain if (IS_ERR(inodes)) { 3405418ffb9eSAnand Jain ret = PTR_ERR(inodes); 3406418ffb9eSAnand Jain goto out_loi; 3407418ffb9eSAnand Jain } 3408418ffb9eSAnand Jain 3409d7728c96SJan Schmidt path = btrfs_alloc_path(); 3410d7728c96SJan Schmidt if (!path) { 3411d7728c96SJan Schmidt ret = -ENOMEM; 3412d7728c96SJan Schmidt goto out; 3413d7728c96SJan Schmidt } 34142ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3415e3059ec0SDavid Sterba inodes, ignore_offset); 3416418ffb9eSAnand Jain btrfs_free_path(path); 3417df031f07SLiu Bo if (ret == -EINVAL) 3418d7728c96SJan Schmidt ret = -ENOENT; 3419d7728c96SJan Schmidt if (ret < 0) 3420d7728c96SJan Schmidt goto out; 3421d7728c96SJan Schmidt 3422718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3423718dc5faSOmar Sandoval size); 3424d7728c96SJan Schmidt if (ret) 3425d7728c96SJan Schmidt ret = -EFAULT; 3426d7728c96SJan Schmidt 3427d7728c96SJan Schmidt out: 3428f54de068SDavid Sterba kvfree(inodes); 3429d24a67b2SZygo Blaxell out_loi: 3430d7728c96SJan Schmidt kfree(loi); 3431d7728c96SJan Schmidt 3432d7728c96SJan Schmidt return ret; 3433d7728c96SJan Schmidt } 3434d7728c96SJan Schmidt 3435008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3436c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3437c9e9f97bSIlya Dryomov { 3438c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3439c9e9f97bSIlya Dryomov 3440c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3441c9e9f97bSIlya Dryomov 34423009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3443837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3444837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3445837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3446a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3447a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3448837d5b6eSIlya Dryomov 3449c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3450c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3451c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 345219a39dceSIlya Dryomov 345319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 345419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 345519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3456c9e9f97bSIlya Dryomov } 3457c9e9f97bSIlya Dryomov 345843dd529aSDavid Sterba /* 34597fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 34607fb10ed8SNikolay Borisov * required. 34617fb10ed8SNikolay Borisov * 34627fb10ed8SNikolay Borisov * @fs_info: the filesystem 34637fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 34647fb10ed8SNikolay Borisov * is being resumed 34657fb10ed8SNikolay Borisov * 34667fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 34677fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 34687fb10ed8SNikolay Borisov */ 34697fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 34707fb10ed8SNikolay Borisov { 34717fb10ed8SNikolay Borisov int ret; 34727fb10ed8SNikolay Borisov 34737fb10ed8SNikolay Borisov /* 34747fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 34757fb10ed8SNikolay Borisov * (1) some other op is running 34767fb10ed8SNikolay Borisov * (2) balance is running 34777fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 34787fb10ed8SNikolay Borisov */ 34797fb10ed8SNikolay Borisov while (1) { 34807fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 34817fb10ed8SNikolay Borisov *excl_acquired = true; 34827fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34837fb10ed8SNikolay Borisov return 0; 34847fb10ed8SNikolay Borisov } 34857fb10ed8SNikolay Borisov 34867fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 34877fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 34887fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 34897fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 34907fb10ed8SNikolay Borisov /* This is (2) */ 34917fb10ed8SNikolay Borisov ret = -EINPROGRESS; 34927fb10ed8SNikolay Borisov goto out_failure; 34937fb10ed8SNikolay Borisov 34947fb10ed8SNikolay Borisov } else { 34957fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 34967fb10ed8SNikolay Borisov /* 34977fb10ed8SNikolay Borisov * Lock released to allow other waiters to 34987fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 34997fb10ed8SNikolay Borisov */ 35007fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 35017fb10ed8SNikolay Borisov 35027fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 35037fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 35047fb10ed8SNikolay Borisov /* This is (3) */ 35057fb10ed8SNikolay Borisov *excl_acquired = false; 35067fb10ed8SNikolay Borisov return 0; 35077fb10ed8SNikolay Borisov } 35087fb10ed8SNikolay Borisov } 35097fb10ed8SNikolay Borisov } else { 35107fb10ed8SNikolay Borisov /* This is (1) */ 35117fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 35127fb10ed8SNikolay Borisov goto out_failure; 35137fb10ed8SNikolay Borisov } 35147fb10ed8SNikolay Borisov 35157fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35167fb10ed8SNikolay Borisov } 35177fb10ed8SNikolay Borisov 35187fb10ed8SNikolay Borisov out_failure: 35197fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 35207fb10ed8SNikolay Borisov *excl_acquired = false; 35217fb10ed8SNikolay Borisov return ret; 35227fb10ed8SNikolay Borisov } 35237fb10ed8SNikolay Borisov 35249ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3525c9e9f97bSIlya Dryomov { 3526496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3527c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3528c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3529c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3530099aa972SNikolay Borisov bool need_unlock = true; 3531c9e9f97bSIlya Dryomov int ret; 3532c9e9f97bSIlya Dryomov 3533c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3534c9e9f97bSIlya Dryomov return -EPERM; 3535c9e9f97bSIlya Dryomov 3536e54bfa31SLiu Bo ret = mnt_want_write_file(file); 35379ba1f6e4SLiu Bo if (ret) 35389ba1f6e4SLiu Bo return ret; 35399ba1f6e4SLiu Bo 3540d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 3541d8645462SNikolay Borisov if (IS_ERR(bargs)) { 3542d8645462SNikolay Borisov ret = PTR_ERR(bargs); 3543d8645462SNikolay Borisov bargs = NULL; 3544d8645462SNikolay Borisov goto out; 3545d8645462SNikolay Borisov } 3546d8645462SNikolay Borisov 3547099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 3548099aa972SNikolay Borisov if (ret) 3549ed0fb78fSIlya Dryomov goto out; 3550ed0fb78fSIlya Dryomov 3551099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 3552099aa972SNikolay Borisov 3553de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 3554de322263SIlya Dryomov if (!fs_info->balance_ctl) { 3555de322263SIlya Dryomov ret = -ENOTCONN; 3556d8645462SNikolay Borisov goto out_unlock; 3557de322263SIlya Dryomov } 3558de322263SIlya Dryomov 3559de322263SIlya Dryomov bctl = fs_info->balance_ctl; 3560de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 3561de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 3562de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 3563efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 3564de322263SIlya Dryomov 3565de322263SIlya Dryomov goto do_balance; 3566de322263SIlya Dryomov } 3567c9e9f97bSIlya Dryomov 3568d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 3569d8645462SNikolay Borisov ret = -EINVAL; 3570d8645462SNikolay Borisov goto out_unlock; 3571c9e9f97bSIlya Dryomov } 3572c9e9f97bSIlya Dryomov 3573ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 3574837d5b6eSIlya Dryomov ret = -EINPROGRESS; 3575d8645462SNikolay Borisov goto out_unlock; 3576837d5b6eSIlya Dryomov } 3577837d5b6eSIlya Dryomov 35788d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 3579c9e9f97bSIlya Dryomov if (!bctl) { 3580c9e9f97bSIlya Dryomov ret = -ENOMEM; 3581d8645462SNikolay Borisov goto out_unlock; 3582c9e9f97bSIlya Dryomov } 3583c9e9f97bSIlya Dryomov 3584c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 3585c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 3586c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 3587c9e9f97bSIlya Dryomov 3588c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 3589de322263SIlya Dryomov do_balance: 3590c9e9f97bSIlya Dryomov /* 3591c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 3592c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 3593c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 3594c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 3595c9e9f97bSIlya Dryomov */ 3596ed0fb78fSIlya Dryomov need_unlock = false; 3597ed0fb78fSIlya Dryomov 35986fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 35990f89abf5SChristian Engelmayer bctl = NULL; 3600ed0fb78fSIlya Dryomov 360139864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 3602c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 3603c9e9f97bSIlya Dryomov ret = -EFAULT; 3604c9e9f97bSIlya Dryomov } 3605c9e9f97bSIlya Dryomov 36060f89abf5SChristian Engelmayer kfree(bctl); 3607ed0fb78fSIlya Dryomov out_unlock: 3608c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 3609ed0fb78fSIlya Dryomov if (need_unlock) 3610c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3611ed0fb78fSIlya Dryomov out: 3612e54bfa31SLiu Bo mnt_drop_write_file(file); 3613d8645462SNikolay Borisov kfree(bargs); 3614c9e9f97bSIlya Dryomov return ret; 3615c9e9f97bSIlya Dryomov } 3616c9e9f97bSIlya Dryomov 36172ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 3618837d5b6eSIlya Dryomov { 3619837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3620837d5b6eSIlya Dryomov return -EPERM; 3621837d5b6eSIlya Dryomov 3622837d5b6eSIlya Dryomov switch (cmd) { 3623837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 36240b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 3625a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 36260b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 3627837d5b6eSIlya Dryomov } 3628837d5b6eSIlya Dryomov 3629837d5b6eSIlya Dryomov return -EINVAL; 3630837d5b6eSIlya Dryomov } 3631837d5b6eSIlya Dryomov 36322ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 363319a39dceSIlya Dryomov void __user *arg) 363419a39dceSIlya Dryomov { 363519a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 363619a39dceSIlya Dryomov int ret = 0; 363719a39dceSIlya Dryomov 363819a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 363919a39dceSIlya Dryomov return -EPERM; 364019a39dceSIlya Dryomov 364119a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 364219a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 364319a39dceSIlya Dryomov ret = -ENOTCONN; 364419a39dceSIlya Dryomov goto out; 364519a39dceSIlya Dryomov } 364619a39dceSIlya Dryomov 36478d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 364819a39dceSIlya Dryomov if (!bargs) { 364919a39dceSIlya Dryomov ret = -ENOMEM; 365019a39dceSIlya Dryomov goto out; 365119a39dceSIlya Dryomov } 365219a39dceSIlya Dryomov 3653008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 365419a39dceSIlya Dryomov 365519a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 365619a39dceSIlya Dryomov ret = -EFAULT; 365719a39dceSIlya Dryomov 365819a39dceSIlya Dryomov kfree(bargs); 365919a39dceSIlya Dryomov out: 366019a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 366119a39dceSIlya Dryomov return ret; 366219a39dceSIlya Dryomov } 366319a39dceSIlya Dryomov 3664905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 36655d13a37bSArne Jansen { 36660b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 36685d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 36695d13a37bSArne Jansen int ret; 36705d13a37bSArne Jansen 36715d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 36725d13a37bSArne Jansen return -EPERM; 36735d13a37bSArne Jansen 3674905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3675905b0ddaSMiao Xie if (ret) 3676905b0ddaSMiao Xie return ret; 36775d13a37bSArne Jansen 36785d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3679905b0ddaSMiao Xie if (IS_ERR(sa)) { 3680905b0ddaSMiao Xie ret = PTR_ERR(sa); 3681905b0ddaSMiao Xie goto drop_write; 3682905b0ddaSMiao Xie } 36835d13a37bSArne Jansen 36840b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 36855d13a37bSArne Jansen 36865d13a37bSArne Jansen switch (sa->cmd) { 36875d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 3688340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 36895d13a37bSArne Jansen break; 36905d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 3691340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 36925d13a37bSArne Jansen break; 36935d13a37bSArne Jansen default: 36945d13a37bSArne Jansen ret = -EINVAL; 36955d13a37bSArne Jansen break; 36965d13a37bSArne Jansen } 36975d13a37bSArne Jansen 36985d13a37bSArne Jansen kfree(sa); 36990b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 3700905b0ddaSMiao Xie drop_write: 3701905b0ddaSMiao Xie mnt_drop_write_file(file); 37025d13a37bSArne Jansen return ret; 37035d13a37bSArne Jansen } 37045d13a37bSArne Jansen 3705905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 37065d13a37bSArne Jansen { 37070b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37090b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37105d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 37115d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37125d13a37bSArne Jansen int ret; 37135d13a37bSArne Jansen int err; 37145d13a37bSArne Jansen 37155d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37165d13a37bSArne Jansen return -EPERM; 37175d13a37bSArne Jansen 3718905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3719905b0ddaSMiao Xie if (ret) 3720905b0ddaSMiao Xie return ret; 37215d13a37bSArne Jansen 37225d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3723905b0ddaSMiao Xie if (IS_ERR(sa)) { 3724905b0ddaSMiao Xie ret = PTR_ERR(sa); 3725905b0ddaSMiao Xie goto drop_write; 3726905b0ddaSMiao Xie } 37275d13a37bSArne Jansen 37285d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37295d13a37bSArne Jansen if (IS_ERR(trans)) { 37305d13a37bSArne Jansen ret = PTR_ERR(trans); 37315d13a37bSArne Jansen goto out; 37325d13a37bSArne Jansen } 37335d13a37bSArne Jansen 37345d13a37bSArne Jansen if (sa->assign) { 37359f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 37365d13a37bSArne Jansen } else { 373739616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 37385d13a37bSArne Jansen } 37395d13a37bSArne Jansen 3740e082f563SQu Wenruo /* update qgroup status and info */ 37412f1a6be1SFilipe Manana mutex_lock(&fs_info->qgroup_ioctl_lock); 3742280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 37432f1a6be1SFilipe Manana mutex_unlock(&fs_info->qgroup_ioctl_lock); 3744e082f563SQu Wenruo if (err < 0) 37450b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 3746ad8403dfSAnand Jain "failed to update qgroup status and info"); 37473a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37485d13a37bSArne Jansen if (err && !ret) 37495d13a37bSArne Jansen ret = err; 37505d13a37bSArne Jansen 37515d13a37bSArne Jansen out: 37525d13a37bSArne Jansen kfree(sa); 3753905b0ddaSMiao Xie drop_write: 3754905b0ddaSMiao Xie mnt_drop_write_file(file); 37555d13a37bSArne Jansen return ret; 37565d13a37bSArne Jansen } 37575d13a37bSArne Jansen 3758905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 37595d13a37bSArne Jansen { 37600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 37610b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 37625d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 37635d13a37bSArne Jansen struct btrfs_trans_handle *trans; 37645d13a37bSArne Jansen int ret; 37655d13a37bSArne Jansen int err; 37665d13a37bSArne Jansen 37675d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 37685d13a37bSArne Jansen return -EPERM; 37695d13a37bSArne Jansen 3770905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3771905b0ddaSMiao Xie if (ret) 3772905b0ddaSMiao Xie return ret; 37735d13a37bSArne Jansen 37745d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3775905b0ddaSMiao Xie if (IS_ERR(sa)) { 3776905b0ddaSMiao Xie ret = PTR_ERR(sa); 3777905b0ddaSMiao Xie goto drop_write; 3778905b0ddaSMiao Xie } 37795d13a37bSArne Jansen 3780d86e56cfSMiao Xie if (!sa->qgroupid) { 3781d86e56cfSMiao Xie ret = -EINVAL; 3782d86e56cfSMiao Xie goto out; 3783d86e56cfSMiao Xie } 3784d86e56cfSMiao Xie 37855d13a37bSArne Jansen trans = btrfs_join_transaction(root); 37865d13a37bSArne Jansen if (IS_ERR(trans)) { 37875d13a37bSArne Jansen ret = PTR_ERR(trans); 37885d13a37bSArne Jansen goto out; 37895d13a37bSArne Jansen } 37905d13a37bSArne Jansen 37915d13a37bSArne Jansen if (sa->create) { 379249a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 37935d13a37bSArne Jansen } else { 37943efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 37955d13a37bSArne Jansen } 37965d13a37bSArne Jansen 37973a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 37985d13a37bSArne Jansen if (err && !ret) 37995d13a37bSArne Jansen ret = err; 38005d13a37bSArne Jansen 38015d13a37bSArne Jansen out: 38025d13a37bSArne Jansen kfree(sa); 3803905b0ddaSMiao Xie drop_write: 3804905b0ddaSMiao Xie mnt_drop_write_file(file); 38055d13a37bSArne Jansen return ret; 38065d13a37bSArne Jansen } 38075d13a37bSArne Jansen 3808905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 38095d13a37bSArne Jansen { 38100b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38110b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 38125d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 38135d13a37bSArne Jansen struct btrfs_trans_handle *trans; 38145d13a37bSArne Jansen int ret; 38155d13a37bSArne Jansen int err; 38165d13a37bSArne Jansen u64 qgroupid; 38175d13a37bSArne Jansen 38185d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 38195d13a37bSArne Jansen return -EPERM; 38205d13a37bSArne Jansen 3821905b0ddaSMiao Xie ret = mnt_want_write_file(file); 3822905b0ddaSMiao Xie if (ret) 3823905b0ddaSMiao Xie return ret; 38245d13a37bSArne Jansen 38255d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 3826905b0ddaSMiao Xie if (IS_ERR(sa)) { 3827905b0ddaSMiao Xie ret = PTR_ERR(sa); 3828905b0ddaSMiao Xie goto drop_write; 3829905b0ddaSMiao Xie } 38305d13a37bSArne Jansen 38315d13a37bSArne Jansen trans = btrfs_join_transaction(root); 38325d13a37bSArne Jansen if (IS_ERR(trans)) { 38335d13a37bSArne Jansen ret = PTR_ERR(trans); 38345d13a37bSArne Jansen goto out; 38355d13a37bSArne Jansen } 38365d13a37bSArne Jansen 38375d13a37bSArne Jansen qgroupid = sa->qgroupid; 38385d13a37bSArne Jansen if (!qgroupid) { 38395d13a37bSArne Jansen /* take the current subvol as qgroup */ 38405d13a37bSArne Jansen qgroupid = root->root_key.objectid; 38415d13a37bSArne Jansen } 38425d13a37bSArne Jansen 3843f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 38445d13a37bSArne Jansen 38453a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 38465d13a37bSArne Jansen if (err && !ret) 38475d13a37bSArne Jansen ret = err; 38485d13a37bSArne Jansen 38495d13a37bSArne Jansen out: 38505d13a37bSArne Jansen kfree(sa); 3851905b0ddaSMiao Xie drop_write: 3852905b0ddaSMiao Xie mnt_drop_write_file(file); 38535d13a37bSArne Jansen return ret; 38545d13a37bSArne Jansen } 38555d13a37bSArne Jansen 38562f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 38572f232036SJan Schmidt { 38580b246afaSJeff Mahoney struct inode *inode = file_inode(file); 38590b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 38602f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 38612f232036SJan Schmidt int ret; 38622f232036SJan Schmidt 38632f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38642f232036SJan Schmidt return -EPERM; 38652f232036SJan Schmidt 38662f232036SJan Schmidt ret = mnt_want_write_file(file); 38672f232036SJan Schmidt if (ret) 38682f232036SJan Schmidt return ret; 38692f232036SJan Schmidt 38702f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 38712f232036SJan Schmidt if (IS_ERR(qsa)) { 38722f232036SJan Schmidt ret = PTR_ERR(qsa); 38732f232036SJan Schmidt goto drop_write; 38742f232036SJan Schmidt } 38752f232036SJan Schmidt 38762f232036SJan Schmidt if (qsa->flags) { 38772f232036SJan Schmidt ret = -EINVAL; 38782f232036SJan Schmidt goto out; 38792f232036SJan Schmidt } 38802f232036SJan Schmidt 38810b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 38822f232036SJan Schmidt 38832f232036SJan Schmidt out: 38842f232036SJan Schmidt kfree(qsa); 38852f232036SJan Schmidt drop_write: 38862f232036SJan Schmidt mnt_drop_write_file(file); 38872f232036SJan Schmidt return ret; 38882f232036SJan Schmidt } 38892f232036SJan Schmidt 3890b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 3891b929c1d8SMarcos Paulo de Souza void __user *arg) 38922f232036SJan Schmidt { 38930afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 38942f232036SJan Schmidt 38952f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 38962f232036SJan Schmidt return -EPERM; 38972f232036SJan Schmidt 38980b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 38990afb603aSGoldwyn Rodrigues qsa.flags = 1; 39000afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 39012f232036SJan Schmidt } 39022f232036SJan Schmidt 39030afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 3904991a3daeSAnand Jain return -EFAULT; 39052f232036SJan Schmidt 3906991a3daeSAnand Jain return 0; 39072f232036SJan Schmidt } 39082f232036SJan Schmidt 3909b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 3910b929c1d8SMarcos Paulo de Souza void __user *arg) 391157254b6eSJan Schmidt { 391257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 391357254b6eSJan Schmidt return -EPERM; 391457254b6eSJan Schmidt 39150b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 391657254b6eSJan Schmidt } 391757254b6eSJan Schmidt 3918abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 391901beba79SChristian Brauner struct mnt_idmap *idmap, 3920abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 39218ea05e3aSAlexander Block { 3922496ad9aaSAl Viro struct inode *inode = file_inode(file); 39230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 39248ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 39258ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 39268ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 392795582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 39288ea05e3aSAlexander Block int ret = 0; 3929dd5f9615SStefan Behrens int received_uuid_changed; 39308ea05e3aSAlexander Block 393101beba79SChristian Brauner if (!inode_owner_or_capable(idmap, inode)) 3932bd60ea0fSDavid Sterba return -EPERM; 3933bd60ea0fSDavid Sterba 39348ea05e3aSAlexander Block ret = mnt_want_write_file(file); 39358ea05e3aSAlexander Block if (ret < 0) 39368ea05e3aSAlexander Block return ret; 39378ea05e3aSAlexander Block 39380b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 39398ea05e3aSAlexander Block 39404a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 39418ea05e3aSAlexander Block ret = -EINVAL; 39428ea05e3aSAlexander Block goto out; 39438ea05e3aSAlexander Block } 39448ea05e3aSAlexander Block 39458ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 39468ea05e3aSAlexander Block ret = -EROFS; 39478ea05e3aSAlexander Block goto out; 39488ea05e3aSAlexander Block } 39498ea05e3aSAlexander Block 3950dd5f9615SStefan Behrens /* 3951dd5f9615SStefan Behrens * 1 - root item 3952dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 3953dd5f9615SStefan Behrens */ 3954dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 39558ea05e3aSAlexander Block if (IS_ERR(trans)) { 39568ea05e3aSAlexander Block ret = PTR_ERR(trans); 39578ea05e3aSAlexander Block trans = NULL; 39588ea05e3aSAlexander Block goto out; 39598ea05e3aSAlexander Block } 39608ea05e3aSAlexander Block 39618ea05e3aSAlexander Block sa->rtransid = trans->transid; 39628ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 39638ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 39648ea05e3aSAlexander Block 3965dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 3966dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 3967dd5f9615SStefan Behrens if (received_uuid_changed && 3968d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 3969d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 3970dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3971dd5f9615SStefan Behrens root->root_key.objectid); 3972d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 3973d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 3974d87ff758SNikolay Borisov btrfs_end_transaction(trans); 3975d87ff758SNikolay Borisov goto out; 3976d87ff758SNikolay Borisov } 3977d87ff758SNikolay Borisov } 39788ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 39798ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 39808ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 39813cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 39823cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 39833cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 39843cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 39858ea05e3aSAlexander Block 39860b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 39878ea05e3aSAlexander Block &root->root_key, &root->root_item); 39888ea05e3aSAlexander Block if (ret < 0) { 39893a45bb20SJeff Mahoney btrfs_end_transaction(trans); 39908ea05e3aSAlexander Block goto out; 3991dd5f9615SStefan Behrens } 3992dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 3993cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 3994dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 3995dd5f9615SStefan Behrens root->root_key.objectid); 3996dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 399766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 3998efd38150SNikolay Borisov btrfs_end_transaction(trans); 3999dd5f9615SStefan Behrens goto out; 4000dd5f9615SStefan Behrens } 4001dd5f9615SStefan Behrens } 40023a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4003abccd00fSHugo Mills out: 40040b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4005abccd00fSHugo Mills mnt_drop_write_file(file); 4006abccd00fSHugo Mills return ret; 4007abccd00fSHugo Mills } 4008abccd00fSHugo Mills 4009abccd00fSHugo Mills #ifdef CONFIG_64BIT 4010abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4011abccd00fSHugo Mills void __user *arg) 4012abccd00fSHugo Mills { 4013abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4014abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4015abccd00fSHugo Mills int ret = 0; 4016abccd00fSHugo Mills 4017abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 40187b9ea627SShailendra Verma if (IS_ERR(args32)) 40197b9ea627SShailendra Verma return PTR_ERR(args32); 4020abccd00fSHugo Mills 40218d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 402284dbeb87SDan Carpenter if (!args64) { 402384dbeb87SDan Carpenter ret = -ENOMEM; 4024abccd00fSHugo Mills goto out; 4025abccd00fSHugo Mills } 4026abccd00fSHugo Mills 4027abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4028abccd00fSHugo Mills args64->stransid = args32->stransid; 4029abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4030abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4031abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4032abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4033abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4034abccd00fSHugo Mills args64->flags = args32->flags; 4035abccd00fSHugo Mills 403601beba79SChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), args64); 4037abccd00fSHugo Mills if (ret) 4038abccd00fSHugo Mills goto out; 4039abccd00fSHugo Mills 4040abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4041abccd00fSHugo Mills args32->stransid = args64->stransid; 4042abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4043abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4044abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4045abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4046abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4047abccd00fSHugo Mills args32->flags = args64->flags; 4048abccd00fSHugo Mills 4049abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4050abccd00fSHugo Mills if (ret) 4051abccd00fSHugo Mills ret = -EFAULT; 4052abccd00fSHugo Mills 4053abccd00fSHugo Mills out: 4054abccd00fSHugo Mills kfree(args32); 4055abccd00fSHugo Mills kfree(args64); 4056abccd00fSHugo Mills return ret; 4057abccd00fSHugo Mills } 4058abccd00fSHugo Mills #endif 4059abccd00fSHugo Mills 4060abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4061abccd00fSHugo Mills void __user *arg) 4062abccd00fSHugo Mills { 4063abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4064abccd00fSHugo Mills int ret = 0; 4065abccd00fSHugo Mills 4066abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 40677b9ea627SShailendra Verma if (IS_ERR(sa)) 40687b9ea627SShailendra Verma return PTR_ERR(sa); 4069abccd00fSHugo Mills 407001beba79SChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), sa); 4071abccd00fSHugo Mills 4072abccd00fSHugo Mills if (ret) 4073abccd00fSHugo Mills goto out; 4074abccd00fSHugo Mills 40758ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 40768ea05e3aSAlexander Block if (ret) 40778ea05e3aSAlexander Block ret = -EFAULT; 40788ea05e3aSAlexander Block 40798ea05e3aSAlexander Block out: 40808ea05e3aSAlexander Block kfree(sa); 40818ea05e3aSAlexander Block return ret; 40828ea05e3aSAlexander Block } 40838ea05e3aSAlexander Block 4084b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4085b929c1d8SMarcos Paulo de Souza void __user *arg) 4086867ab667Sjeff.liu { 4087a1b83ac5SAnand Jain size_t len; 4088867ab667Sjeff.liu int ret; 4089a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4090a1b83ac5SAnand Jain 40910b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 40920b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 40930b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4094a1b83ac5SAnand Jain 4095a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4096867ab667Sjeff.liu 4097867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 40980b246afaSJeff Mahoney btrfs_warn(fs_info, 40990b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 41000b246afaSJeff Mahoney --len); 4101867ab667Sjeff.liu } 4102867ab667Sjeff.liu 4103867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4104867ab667Sjeff.liu 4105867ab667Sjeff.liu return ret ? -EFAULT : 0; 4106867ab667Sjeff.liu } 4107867ab667Sjeff.liu 4108a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4109a8bfd4abSjeff.liu { 41100b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41120b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 41130b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4114a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4115a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4116a8bfd4abSjeff.liu int ret; 4117a8bfd4abSjeff.liu 4118a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4119a8bfd4abSjeff.liu return -EPERM; 4120a8bfd4abSjeff.liu 4121a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4122a8bfd4abSjeff.liu return -EFAULT; 4123a8bfd4abSjeff.liu 4124a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 41250b246afaSJeff Mahoney btrfs_err(fs_info, 41265d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4127a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4128a8bfd4abSjeff.liu return -EINVAL; 4129a8bfd4abSjeff.liu } 4130a8bfd4abSjeff.liu 4131a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4132a8bfd4abSjeff.liu if (ret) 4133a8bfd4abSjeff.liu return ret; 4134a8bfd4abSjeff.liu 4135a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4136a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4137a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4138a8bfd4abSjeff.liu goto out_unlock; 4139a8bfd4abSjeff.liu } 4140a8bfd4abSjeff.liu 41410b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4142a8bfd4abSjeff.liu strcpy(super_block->label, label); 41430b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 41443a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4145a8bfd4abSjeff.liu 4146a8bfd4abSjeff.liu out_unlock: 4147a8bfd4abSjeff.liu mnt_drop_write_file(file); 4148a8bfd4abSjeff.liu return ret; 4149a8bfd4abSjeff.liu } 4150a8bfd4abSjeff.liu 41512eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 41522eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 41532eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 41542eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 41552eaa055fSJeff Mahoney 4156d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 41572eaa055fSJeff Mahoney { 41584d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 41592eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 41602eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 41612eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 41622eaa055fSJeff Mahoney }; 41632eaa055fSJeff Mahoney 41642eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41652eaa055fSJeff Mahoney return -EFAULT; 41662eaa055fSJeff Mahoney 41672eaa055fSJeff Mahoney return 0; 41682eaa055fSJeff Mahoney } 41692eaa055fSJeff Mahoney 4170b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4171b929c1d8SMarcos Paulo de Souza void __user *arg) 41722eaa055fSJeff Mahoney { 41730b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 41742eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 41752eaa055fSJeff Mahoney 41762eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 41772eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 41782eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 41792eaa055fSJeff Mahoney 41802eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 41812eaa055fSJeff Mahoney return -EFAULT; 41822eaa055fSJeff Mahoney 41832eaa055fSJeff Mahoney return 0; 41842eaa055fSJeff Mahoney } 41852eaa055fSJeff Mahoney 41862ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 41873b02a68aSJeff Mahoney enum btrfs_feature_set set, 41882eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 41892eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 41902eaa055fSJeff Mahoney { 4191f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 41923b02a68aSJeff Mahoney char *names; 41932eaa055fSJeff Mahoney u64 disallowed, unsupported; 41942eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 41952eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 41962eaa055fSJeff Mahoney 41972eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 41982eaa055fSJeff Mahoney if (unsupported) { 41993b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 42003b02a68aSJeff Mahoney if (names) { 42010b246afaSJeff Mahoney btrfs_warn(fs_info, 42023b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 42033b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42043b02a68aSJeff Mahoney kfree(names); 42053b02a68aSJeff Mahoney } else 42060b246afaSJeff Mahoney btrfs_warn(fs_info, 42072eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 42082eaa055fSJeff Mahoney type, unsupported); 42092eaa055fSJeff Mahoney return -EOPNOTSUPP; 42102eaa055fSJeff Mahoney } 42112eaa055fSJeff Mahoney 42122eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 42132eaa055fSJeff Mahoney if (disallowed) { 42143b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42153b02a68aSJeff Mahoney if (names) { 42160b246afaSJeff Mahoney btrfs_warn(fs_info, 42173b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 42183b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42193b02a68aSJeff Mahoney kfree(names); 42203b02a68aSJeff Mahoney } else 42210b246afaSJeff Mahoney btrfs_warn(fs_info, 42222eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 42232eaa055fSJeff Mahoney type, disallowed); 42242eaa055fSJeff Mahoney return -EPERM; 42252eaa055fSJeff Mahoney } 42262eaa055fSJeff Mahoney 42272eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 42282eaa055fSJeff Mahoney if (disallowed) { 42293b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 42303b02a68aSJeff Mahoney if (names) { 42310b246afaSJeff Mahoney btrfs_warn(fs_info, 42323b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 42333b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 42343b02a68aSJeff Mahoney kfree(names); 42353b02a68aSJeff Mahoney } else 42360b246afaSJeff Mahoney btrfs_warn(fs_info, 42372eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 42382eaa055fSJeff Mahoney type, disallowed); 42392eaa055fSJeff Mahoney return -EPERM; 42402eaa055fSJeff Mahoney } 42412eaa055fSJeff Mahoney 42422eaa055fSJeff Mahoney return 0; 42432eaa055fSJeff Mahoney } 42442eaa055fSJeff Mahoney 42452ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 42462ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 42472eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 42482eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 42492eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 42502eaa055fSJeff Mahoney 42512eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 42522eaa055fSJeff Mahoney { 42530b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42540b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42550b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42560b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 42572eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 42582eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 42592eaa055fSJeff Mahoney u64 newflags; 42602eaa055fSJeff Mahoney int ret; 42612eaa055fSJeff Mahoney 42622eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 42632eaa055fSJeff Mahoney return -EPERM; 42642eaa055fSJeff Mahoney 42652eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 42662eaa055fSJeff Mahoney return -EFAULT; 42672eaa055fSJeff Mahoney 42682eaa055fSJeff Mahoney /* Nothing to do */ 42692eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 42702eaa055fSJeff Mahoney !flags[0].incompat_flags) 42712eaa055fSJeff Mahoney return 0; 42722eaa055fSJeff Mahoney 42732ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 42742eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 42752eaa055fSJeff Mahoney if (ret) 42762eaa055fSJeff Mahoney return ret; 42772eaa055fSJeff Mahoney 42782ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 42792eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 42802eaa055fSJeff Mahoney if (ret) 42812eaa055fSJeff Mahoney return ret; 42822eaa055fSJeff Mahoney 42832ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 42842eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 42852eaa055fSJeff Mahoney if (ret) 42862eaa055fSJeff Mahoney return ret; 42872eaa055fSJeff Mahoney 42887ab19625SDavid Sterba ret = mnt_want_write_file(file); 42897ab19625SDavid Sterba if (ret) 42907ab19625SDavid Sterba return ret; 42917ab19625SDavid Sterba 42928051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 42937ab19625SDavid Sterba if (IS_ERR(trans)) { 42947ab19625SDavid Sterba ret = PTR_ERR(trans); 42957ab19625SDavid Sterba goto out_drop_write; 42967ab19625SDavid Sterba } 42972eaa055fSJeff Mahoney 42980b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 42992eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 43002eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 43012eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 43022eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 43032eaa055fSJeff Mahoney 43042eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 43052eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 43062eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 43072eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 43082eaa055fSJeff Mahoney 43092eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 43102eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 43112eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 43122eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 43130b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 43142eaa055fSJeff Mahoney 43153a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 43167ab19625SDavid Sterba out_drop_write: 43177ab19625SDavid Sterba mnt_drop_write_file(file); 43187ab19625SDavid Sterba 43197ab19625SDavid Sterba return ret; 43202eaa055fSJeff Mahoney } 43212eaa055fSJeff Mahoney 43229ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 43232351f431SJosef Bacik { 43242351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 43252351f431SJosef Bacik int ret; 43262351f431SJosef Bacik 43272351f431SJosef Bacik if (compat) { 43282351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43292351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 43302351f431SJosef Bacik 43312351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 43322351f431SJosef Bacik if (ret) 43332351f431SJosef Bacik return -EFAULT; 43342351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 43352351f431SJosef Bacik if (!arg) 43362351f431SJosef Bacik return -ENOMEM; 43372351f431SJosef Bacik arg->send_fd = args32.send_fd; 43382351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 43392351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 43402351f431SJosef Bacik arg->parent_root = args32.parent_root; 43412351f431SJosef Bacik arg->flags = args32.flags; 43422351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 43432351f431SJosef Bacik sizeof(args32.reserved)); 43442351f431SJosef Bacik #else 43452351f431SJosef Bacik return -ENOTTY; 43462351f431SJosef Bacik #endif 43472351f431SJosef Bacik } else { 43482351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 43492351f431SJosef Bacik if (IS_ERR(arg)) 43502351f431SJosef Bacik return PTR_ERR(arg); 43512351f431SJosef Bacik } 43529ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 43532351f431SJosef Bacik kfree(arg); 43542351f431SJosef Bacik return ret; 43552351f431SJosef Bacik } 43562351f431SJosef Bacik 43571881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 43581881fba8SOmar Sandoval bool compat) 43591881fba8SOmar Sandoval { 43601881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 43611881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 43621881fba8SOmar Sandoval flags); 43631881fba8SOmar Sandoval size_t copy_end; 43641881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 43651881fba8SOmar Sandoval struct iovec *iov = iovstack; 43661881fba8SOmar Sandoval struct iov_iter iter; 43671881fba8SOmar Sandoval loff_t pos; 43681881fba8SOmar Sandoval struct kiocb kiocb; 43691881fba8SOmar Sandoval ssize_t ret; 43701881fba8SOmar Sandoval 43711881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 43721881fba8SOmar Sandoval ret = -EPERM; 43731881fba8SOmar Sandoval goto out_acct; 43741881fba8SOmar Sandoval } 43751881fba8SOmar Sandoval 43761881fba8SOmar Sandoval if (compat) { 43771881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 43781881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 43791881fba8SOmar Sandoval 43801881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 43811881fba8SOmar Sandoval flags); 43821881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 43831881fba8SOmar Sandoval ret = -EFAULT; 43841881fba8SOmar Sandoval goto out_acct; 43851881fba8SOmar Sandoval } 43861881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 43871881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 43881881fba8SOmar Sandoval args.offset = args32.offset; 43891881fba8SOmar Sandoval args.flags = args32.flags; 43901881fba8SOmar Sandoval #else 43911881fba8SOmar Sandoval return -ENOTTY; 43921881fba8SOmar Sandoval #endif 43931881fba8SOmar Sandoval } else { 43941881fba8SOmar Sandoval copy_end = copy_end_kernel; 43951881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 43961881fba8SOmar Sandoval ret = -EFAULT; 43971881fba8SOmar Sandoval goto out_acct; 43981881fba8SOmar Sandoval } 43991881fba8SOmar Sandoval } 44001881fba8SOmar Sandoval if (args.flags != 0) { 44011881fba8SOmar Sandoval ret = -EINVAL; 44021881fba8SOmar Sandoval goto out_acct; 44031881fba8SOmar Sandoval } 44041881fba8SOmar Sandoval 4405de4eda9dSAl Viro ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 44061881fba8SOmar Sandoval &iov, &iter); 44071881fba8SOmar Sandoval if (ret < 0) 44081881fba8SOmar Sandoval goto out_acct; 44091881fba8SOmar Sandoval 44101881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 44111881fba8SOmar Sandoval ret = 0; 44121881fba8SOmar Sandoval goto out_iov; 44131881fba8SOmar Sandoval } 44141881fba8SOmar Sandoval pos = args.offset; 44151881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 44161881fba8SOmar Sandoval if (ret < 0) 44171881fba8SOmar Sandoval goto out_iov; 44181881fba8SOmar Sandoval 44191881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 44201881fba8SOmar Sandoval kiocb.ki_pos = pos; 44211881fba8SOmar Sandoval 44221881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 44231881fba8SOmar Sandoval if (ret >= 0) { 44241881fba8SOmar Sandoval fsnotify_access(file); 44251881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 44261881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 44271881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 44281881fba8SOmar Sandoval ret = -EFAULT; 44291881fba8SOmar Sandoval } 44301881fba8SOmar Sandoval 44311881fba8SOmar Sandoval out_iov: 44321881fba8SOmar Sandoval kfree(iov); 44331881fba8SOmar Sandoval out_acct: 44341881fba8SOmar Sandoval if (ret > 0) 44351881fba8SOmar Sandoval add_rchar(current, ret); 44361881fba8SOmar Sandoval inc_syscr(current); 44371881fba8SOmar Sandoval return ret; 44381881fba8SOmar Sandoval } 44391881fba8SOmar Sandoval 44407c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 44417c0c7269SOmar Sandoval { 44427c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 44437c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 44447c0c7269SOmar Sandoval struct iovec *iov = iovstack; 44457c0c7269SOmar Sandoval struct iov_iter iter; 44467c0c7269SOmar Sandoval loff_t pos; 44477c0c7269SOmar Sandoval struct kiocb kiocb; 44487c0c7269SOmar Sandoval ssize_t ret; 44497c0c7269SOmar Sandoval 44507c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 44517c0c7269SOmar Sandoval ret = -EPERM; 44527c0c7269SOmar Sandoval goto out_acct; 44537c0c7269SOmar Sandoval } 44547c0c7269SOmar Sandoval 44557c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 44567c0c7269SOmar Sandoval ret = -EBADF; 44577c0c7269SOmar Sandoval goto out_acct; 44587c0c7269SOmar Sandoval } 44597c0c7269SOmar Sandoval 44607c0c7269SOmar Sandoval if (compat) { 44617c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 44627c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 44637c0c7269SOmar Sandoval 44647c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 44657c0c7269SOmar Sandoval ret = -EFAULT; 44667c0c7269SOmar Sandoval goto out_acct; 44677c0c7269SOmar Sandoval } 44687c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 44697c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 44707c0c7269SOmar Sandoval args.offset = args32.offset; 44717c0c7269SOmar Sandoval args.flags = args32.flags; 44727c0c7269SOmar Sandoval args.len = args32.len; 44737c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 44747c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 44757c0c7269SOmar Sandoval args.compression = args32.compression; 44767c0c7269SOmar Sandoval args.encryption = args32.encryption; 44777c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 44787c0c7269SOmar Sandoval #else 44797c0c7269SOmar Sandoval return -ENOTTY; 44807c0c7269SOmar Sandoval #endif 44817c0c7269SOmar Sandoval } else { 44827c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 44837c0c7269SOmar Sandoval ret = -EFAULT; 44847c0c7269SOmar Sandoval goto out_acct; 44857c0c7269SOmar Sandoval } 44867c0c7269SOmar Sandoval } 44877c0c7269SOmar Sandoval 44887c0c7269SOmar Sandoval ret = -EINVAL; 44897c0c7269SOmar Sandoval if (args.flags != 0) 44907c0c7269SOmar Sandoval goto out_acct; 44917c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 44927c0c7269SOmar Sandoval goto out_acct; 44937c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 44947c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 44957c0c7269SOmar Sandoval goto out_acct; 44967c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 44977c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 44987c0c7269SOmar Sandoval goto out_acct; 44997c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 45007c0c7269SOmar Sandoval goto out_acct; 45017c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 45027c0c7269SOmar Sandoval goto out_acct; 45037c0c7269SOmar Sandoval 4504de4eda9dSAl Viro ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 45057c0c7269SOmar Sandoval &iov, &iter); 45067c0c7269SOmar Sandoval if (ret < 0) 45077c0c7269SOmar Sandoval goto out_acct; 45087c0c7269SOmar Sandoval 45097c0c7269SOmar Sandoval file_start_write(file); 45107c0c7269SOmar Sandoval 45117c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 45127c0c7269SOmar Sandoval ret = 0; 45137c0c7269SOmar Sandoval goto out_end_write; 45147c0c7269SOmar Sandoval } 45157c0c7269SOmar Sandoval pos = args.offset; 45167c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 45177c0c7269SOmar Sandoval if (ret < 0) 45187c0c7269SOmar Sandoval goto out_end_write; 45197c0c7269SOmar Sandoval 45207c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 45217c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 45227c0c7269SOmar Sandoval if (ret) 45237c0c7269SOmar Sandoval goto out_end_write; 45247c0c7269SOmar Sandoval kiocb.ki_pos = pos; 45257c0c7269SOmar Sandoval 45267c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 45277c0c7269SOmar Sandoval if (ret > 0) 45287c0c7269SOmar Sandoval fsnotify_modify(file); 45297c0c7269SOmar Sandoval 45307c0c7269SOmar Sandoval out_end_write: 45317c0c7269SOmar Sandoval file_end_write(file); 45327c0c7269SOmar Sandoval kfree(iov); 45337c0c7269SOmar Sandoval out_acct: 45347c0c7269SOmar Sandoval if (ret > 0) 45357c0c7269SOmar Sandoval add_wchar(current, ret); 45367c0c7269SOmar Sandoval inc_syscw(current); 45377c0c7269SOmar Sandoval return ret; 45387c0c7269SOmar Sandoval } 45397c0c7269SOmar Sandoval 4540f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4541f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4542f46b5a66SChristoph Hellwig { 45430b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45440b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45450b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45464bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4547f46b5a66SChristoph Hellwig 4548f46b5a66SChristoph Hellwig switch (cmd) { 45496cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 4550dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 455140cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4552b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 455340cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 455440cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4555f7039b1dSLi Dongyang case FITRIM: 4556b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4557f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4558fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4559fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4560fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 45613de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4562fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 45636f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 45646f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 456576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4566949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4567949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4568949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 45690caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 45709ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 45710caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 45720caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 45736ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 45746ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4575f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 45761e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 45771e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 45781e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4579f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4580198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4581f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 45822ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4583f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4584da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 45856b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 45866b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4587475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 45882ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4589475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 45902ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4591ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 45929ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 4593cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 45949ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 4595ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4596dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 4597d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4598d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4599d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4600d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4601d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4602d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 46031406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 46042ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 46059b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 46069b199859SFilipe David Borba Manana int ret; 46079b199859SFilipe David Borba Manana 46089db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 46099b199859SFilipe David Borba Manana if (ret) 46109b199859SFilipe David Borba Manana return ret; 46110b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 46122fad4e83SDavid Sterba /* 46132fad4e83SDavid Sterba * The transaction thread may want to do more work, 461401327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 46152fad4e83SDavid Sterba * processing uncleaned subvols. 46162fad4e83SDavid Sterba */ 46170b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 46189b199859SFilipe David Borba Manana return ret; 46199b199859SFilipe David Borba Manana } 462046204592SSage Weil case BTRFS_IOC_START_SYNC: 46219a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 462246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 46232ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4624475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4625b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4626475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 46272ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4628475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 46292ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4630c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 46319ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4632837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 46332ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 463419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 46352ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 46368ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 46378ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4638abccd00fSHugo Mills #ifdef CONFIG_64BIT 4639abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4640abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4641abccd00fSHugo Mills #endif 464231db9f7cSAlexander Block case BTRFS_IOC_SEND: 46439ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 46442351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46452351f431SJosef Bacik case BTRFS_IOC_SEND_32: 46469ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 46472351f431SJosef Bacik #endif 4648c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 46492ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 46505d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4651905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 46525d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4653905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 46545d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4655905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 46565d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4657905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 46582f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 46592f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 46602f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 4661b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 466257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 4663b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 46643f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 46652ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 46662eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 4667d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 46682eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 4669b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 46702eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 46712eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 4672b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 46739ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 467442e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 4675dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 467623d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 467723d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 467814605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 467914605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 468014605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 468114605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 46821881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 46831881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 46847c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 46857c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 46861881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 46871881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 46881881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 46897c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 46907c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 46911881fba8SOmar Sandoval #endif 4692f46b5a66SChristoph Hellwig } 4693f46b5a66SChristoph Hellwig 4694f46b5a66SChristoph Hellwig return -ENOTTY; 4695f46b5a66SChristoph Hellwig } 46964c63c245SLuke Dashjr 46974c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 46984c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 46994c63c245SLuke Dashjr { 47002a362249SJeff Mahoney /* 47012a362249SJeff Mahoney * These all access 32-bit values anyway so no further 47022a362249SJeff Mahoney * handling is necessary. 47032a362249SJeff Mahoney */ 47044c63c245SLuke Dashjr switch (cmd) { 47054c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 47064c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 47074c63c245SLuke Dashjr break; 47084c63c245SLuke Dashjr } 47094c63c245SLuke Dashjr 47104c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 47114c63c245SLuke Dashjr } 47124c63c245SLuke Dashjr #endif 4713