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" 56*45c40c8fSJosef Bacik #include "root-tree.h" 57f46b5a66SChristoph Hellwig 58abccd00fSHugo Mills #ifdef CONFIG_64BIT 59abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 60abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 61abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 62abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 63abccd00fSHugo Mills */ 64abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 65abccd00fSHugo Mills __u64 sec; 66abccd00fSHugo Mills __u32 nsec; 67abccd00fSHugo Mills } __attribute__ ((__packed__)); 68abccd00fSHugo Mills 69abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 70abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 71abccd00fSHugo Mills __u64 stransid; /* in */ 72abccd00fSHugo Mills __u64 rtransid; /* out */ 73abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 74abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 75abccd00fSHugo Mills __u64 flags; /* in */ 76abccd00fSHugo Mills __u64 reserved[16]; /* in */ 77abccd00fSHugo Mills } __attribute__ ((__packed__)); 78abccd00fSHugo Mills 79abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 80abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 81abccd00fSHugo Mills #endif 82abccd00fSHugo Mills 832351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 842351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 852351f431SJosef Bacik __s64 send_fd; /* in */ 862351f431SJosef Bacik __u64 clone_sources_count; /* in */ 872351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 882351f431SJosef Bacik __u64 parent_root; /* in */ 892351f431SJosef Bacik __u64 flags; /* in */ 90e77fbf99SDavid Sterba __u32 version; /* in */ 91e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 922351f431SJosef Bacik } __attribute__ ((__packed__)); 932351f431SJosef Bacik 942351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 952351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 961881fba8SOmar Sandoval 971881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 { 981881fba8SOmar Sandoval compat_uptr_t iov; 991881fba8SOmar Sandoval compat_ulong_t iovcnt; 1001881fba8SOmar Sandoval __s64 offset; 1011881fba8SOmar Sandoval __u64 flags; 1021881fba8SOmar Sandoval __u64 len; 1031881fba8SOmar Sandoval __u64 unencoded_len; 1041881fba8SOmar Sandoval __u64 unencoded_offset; 1051881fba8SOmar Sandoval __u32 compression; 1061881fba8SOmar Sandoval __u32 encryption; 1071881fba8SOmar Sandoval __u8 reserved[64]; 1081881fba8SOmar Sandoval }; 1091881fba8SOmar Sandoval 1101881fba8SOmar Sandoval #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ 1111881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1127c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 1137c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1142351f431SJosef Bacik #endif 115abccd00fSHugo Mills 1166cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 1171905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 1181905a0f7SDavid Sterba unsigned int flags) 1196cbff00fSChristoph Hellwig { 1201905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 1216cbff00fSChristoph Hellwig return flags; 1221905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1236cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1246cbff00fSChristoph Hellwig else 1256cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1266cbff00fSChristoph Hellwig } 127f46b5a66SChristoph Hellwig 1286cbff00fSChristoph Hellwig /* 129a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 130a157d4fdSDavid Sterba * ioctl. 1316cbff00fSChristoph Hellwig */ 13277eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1336cbff00fSChristoph Hellwig { 1346cbff00fSChristoph Hellwig unsigned int iflags = 0; 13577eea05eSBoris Burkov u32 flags = binode->flags; 13614605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1376cbff00fSChristoph Hellwig 1386cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1396cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1406cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1416cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1426cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1436cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1446cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1456cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1466cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1476cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1486cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1496cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 150d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 151d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 15214605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 15314605409SBoris Burkov iflags |= FS_VERITY_FL; 154d0092bddSLi Zefan 15513f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 156d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 15713f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 15813f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1596cbff00fSChristoph Hellwig 1606cbff00fSChristoph Hellwig return iflags; 1616cbff00fSChristoph Hellwig } 1626cbff00fSChristoph Hellwig 1636cbff00fSChristoph Hellwig /* 1646cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1656cbff00fSChristoph Hellwig */ 1667b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1676cbff00fSChristoph Hellwig { 1685c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1693cc79392SFilipe Manana unsigned int new_fl = 0; 1706cbff00fSChristoph Hellwig 1715c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1723cc79392SFilipe Manana new_fl |= S_SYNC; 1735c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1743cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1755c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1763cc79392SFilipe Manana new_fl |= S_APPEND; 1775c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1783cc79392SFilipe Manana new_fl |= S_NOATIME; 1795c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1803cc79392SFilipe Manana new_fl |= S_DIRSYNC; 18114605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 18214605409SBoris Burkov new_fl |= S_VERITY; 1833cc79392SFilipe Manana 1843cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 18514605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 18614605409SBoris Burkov S_VERITY, new_fl); 1876cbff00fSChristoph Hellwig } 1886cbff00fSChristoph Hellwig 189f37c563bSDavid Sterba /* 190f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 191f37c563bSDavid Sterba * the old and new flags are not conflicting 192f37c563bSDavid Sterba */ 193f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 19475e7cb7fSLiu Bo { 19575e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19675e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19775e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 198e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 199e1e8fb6aSLi Zefan FS_NOCOW_FL)) 20075e7cb7fSLiu Bo return -EOPNOTSUPP; 20175e7cb7fSLiu Bo 202f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 20375e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20475e7cb7fSLiu Bo return -EINVAL; 20575e7cb7fSLiu Bo 206f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 207f37c563bSDavid Sterba return -EINVAL; 208f37c563bSDavid Sterba 209f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 210f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 211f37c563bSDavid Sterba return -EINVAL; 212f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 213f37c563bSDavid Sterba return -EINVAL; 214f37c563bSDavid Sterba 21575e7cb7fSLiu Bo return 0; 21675e7cb7fSLiu Bo } 21775e7cb7fSLiu Bo 218d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 219d206e9c9SNaohiro Aota unsigned int flags) 220d206e9c9SNaohiro Aota { 221d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 222d206e9c9SNaohiro Aota return -EPERM; 223d206e9c9SNaohiro Aota 224d206e9c9SNaohiro Aota return 0; 225d206e9c9SNaohiro Aota } 226d206e9c9SNaohiro Aota 22797fc2977SMiklos Szeredi /* 22897fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 22997fc2977SMiklos Szeredi * fsxattr are zeroed. 23097fc2977SMiklos Szeredi */ 23197fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2326cbff00fSChristoph Hellwig { 23397fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 23497fc2977SMiklos Szeredi 23577eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 23697fc2977SMiklos Szeredi return 0; 23797fc2977SMiklos Szeredi } 23897fc2977SMiklos Szeredi 23997fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 24097fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 24197fc2977SMiklos Szeredi { 24297fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2430b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2445c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2455c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2466cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2475aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2486cbff00fSChristoph Hellwig int ret; 249ff9fef55SAnand Jain const char *comp = NULL; 250f37c563bSDavid Sterba u32 binode_flags; 2516cbff00fSChristoph Hellwig 252b83cc969SLi Zefan if (btrfs_root_readonly(root)) 253b83cc969SLi Zefan return -EROFS; 254b83cc969SLi Zefan 25597fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 25697fc2977SMiklos Szeredi return -EOPNOTSUPP; 2576cbff00fSChristoph Hellwig 25897fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 25977eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 26097fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 261e7848683SJan Kara if (ret) 262e7848683SJan Kara return ret; 263e7848683SJan Kara 264d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 265d206e9c9SNaohiro Aota if (ret) 26697fc2977SMiklos Szeredi return ret; 267d206e9c9SNaohiro Aota 268f37c563bSDavid Sterba binode_flags = binode->flags; 2695c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 270d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2716cbff00fSChristoph Hellwig else 272d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2735c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 274d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2756cbff00fSChristoph Hellwig else 276d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2775c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 278d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2796cbff00fSChristoph Hellwig else 280d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2815c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 282d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2836cbff00fSChristoph Hellwig else 284d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2855c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 286d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2876cbff00fSChristoph Hellwig else 288d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 28997fc2977SMiklos Szeredi 29097fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 29197fc2977SMiklos Szeredi if (!fa->flags_valid) { 29297fc2977SMiklos Szeredi /* 1 item for the inode */ 29397fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2949b8a233bSRitesh Harjani if (IS_ERR(trans)) 2959b8a233bSRitesh Harjani return PTR_ERR(trans); 29697fc2977SMiklos Szeredi goto update_flags; 29797fc2977SMiklos Szeredi } 29897fc2977SMiklos Szeredi 2995c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 300d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 3016cbff00fSChristoph Hellwig else 302d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 3035c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 30444e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3057e97b8daSDavid Sterba /* 3067e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 3077e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 3087e97b8daSDavid Sterba * status of the file and will not set it. 3097e97b8daSDavid Sterba */ 3107e97b8daSDavid Sterba if (inode->i_size == 0) 311d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 312d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 3137e97b8daSDavid Sterba } else { 314d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 3157e97b8daSDavid Sterba } 3167e97b8daSDavid Sterba } else { 3177e97b8daSDavid Sterba /* 31801327610SNicholas D Steeves * Revert back under same assumptions as above 3197e97b8daSDavid Sterba */ 32044e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3217e97b8daSDavid Sterba if (inode->i_size == 0) 322d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 323d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3247e97b8daSDavid Sterba } else { 325d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3267e97b8daSDavid Sterba } 3277e97b8daSDavid Sterba } 3286cbff00fSChristoph Hellwig 32975e7cb7fSLiu Bo /* 33075e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 33175e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 33275e7cb7fSLiu Bo * things smaller. 33375e7cb7fSLiu Bo */ 3345c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 335d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 336d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3375c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 33863541927SFilipe David Borba Manana 33997fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 34097fc2977SMiklos Szeredi return -ETXTBSY; 341eede2bf3SOmar Sandoval 342d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 343d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 34463541927SFilipe David Borba Manana 34593370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 34693370509SDavid Sterba if (!comp || comp[0] == 0) 34793370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 348ebcb904dSLi Zefan } else { 349d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 35075e7cb7fSLiu Bo } 3516cbff00fSChristoph Hellwig 352ff9fef55SAnand Jain /* 353ff9fef55SAnand Jain * 1 for inode item 354ff9fef55SAnand Jain * 2 for properties 355ff9fef55SAnand Jain */ 356ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 35797fc2977SMiklos Szeredi if (IS_ERR(trans)) 35897fc2977SMiklos Szeredi return PTR_ERR(trans); 3596cbff00fSChristoph Hellwig 360ff9fef55SAnand Jain if (comp) { 361ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 362ff9fef55SAnand Jain strlen(comp), 0); 363ff9fef55SAnand Jain if (ret) { 364ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 365ff9fef55SAnand Jain goto out_end_trans; 366ff9fef55SAnand Jain } 367ff9fef55SAnand Jain } else { 368ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 369ff9fef55SAnand Jain 0, 0); 370ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 371ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 372ff9fef55SAnand Jain goto out_end_trans; 373ff9fef55SAnand Jain } 374ff9fef55SAnand Jain } 375ff9fef55SAnand Jain 37697fc2977SMiklos Szeredi update_flags: 377d2b8fcfeSAnand Jain binode->flags = binode_flags; 3787b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3790c4d2d95SJosef Bacik inode_inc_iversion(inode); 380c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3819a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3826cbff00fSChristoph Hellwig 383ff9fef55SAnand Jain out_end_trans: 3843a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3852d4e6f6aSliubo return ret; 3866cbff00fSChristoph Hellwig } 3876cbff00fSChristoph Hellwig 3880d7ed32cSDavid Sterba /* 3890d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3900d7ed32cSDavid Sterba */ 391c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 392c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 393c3e1f96cSGoldwyn Rodrigues { 3940d7ed32cSDavid Sterba bool ret = false; 3950d7ed32cSDavid Sterba 3960d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3970d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3980d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3990d7ed32cSDavid Sterba ret = true; 4000d7ed32cSDavid Sterba } 4010d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 4020d7ed32cSDavid Sterba 4030d7ed32cSDavid Sterba return ret; 404c3e1f96cSGoldwyn Rodrigues } 405c3e1f96cSGoldwyn Rodrigues 406578bda9eSDavid Sterba /* 407578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 408578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 409578bda9eSDavid Sterba * btrfs_exclop_finish. 410578bda9eSDavid Sterba * 411578bda9eSDavid Sterba * Compatibility: 412578bda9eSDavid Sterba * - the same type is already running 413621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 414578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 415578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 416578bda9eSDavid Sterba */ 417578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 418578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 419578bda9eSDavid Sterba { 420578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 421621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 422621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 423621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 424578bda9eSDavid Sterba return true; 425578bda9eSDavid Sterba 426578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 427578bda9eSDavid Sterba return false; 428578bda9eSDavid Sterba } 429578bda9eSDavid Sterba 430578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 431578bda9eSDavid Sterba { 432578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 433578bda9eSDavid Sterba } 434578bda9eSDavid Sterba 435c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 436c3e1f96cSGoldwyn Rodrigues { 4370d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 438c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4390d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 44066a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 441c3e1f96cSGoldwyn Rodrigues } 442c3e1f96cSGoldwyn Rodrigues 443efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 444efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 445efc0e69cSNikolay Borisov { 446efc0e69cSNikolay Borisov switch (op) { 447efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 448efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 449efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 450efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 451efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 452efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 453efc0e69cSNikolay Borisov break; 454efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 455efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 456efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 457efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 458efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 459efc0e69cSNikolay Borisov break; 460efc0e69cSNikolay Borisov default: 461efc0e69cSNikolay Borisov btrfs_warn(fs_info, 462efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 463efc0e69cSNikolay Borisov } 464efc0e69cSNikolay Borisov } 465efc0e69cSNikolay Borisov 466dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4676cbff00fSChristoph Hellwig { 4686cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4696cbff00fSChristoph Hellwig } 470f46b5a66SChristoph Hellwig 471b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 472b929c1d8SMarcos Paulo de Souza void __user *arg) 473f7039b1dSLi Dongyang { 474f7039b1dSLi Dongyang struct btrfs_device *device; 475f7039b1dSLi Dongyang struct fstrim_range range; 476f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 477f7039b1dSLi Dongyang u64 num_devices = 0; 478f7039b1dSLi Dongyang int ret; 479f7039b1dSLi Dongyang 480f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 481f7039b1dSLi Dongyang return -EPERM; 482f7039b1dSLi Dongyang 483f35f06c3SFilipe Manana /* 4841cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4851cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4861cb3dc3fSNaohiro Aota * filesystem for now. 4871cb3dc3fSNaohiro Aota */ 4881cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4891cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4901cb3dc3fSNaohiro Aota 4911cb3dc3fSNaohiro Aota /* 492f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 493f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 494f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 495f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 496f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 497f35f06c3SFilipe Manana */ 498f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 499f35f06c3SFilipe Manana return -EROFS; 500f35f06c3SFilipe Manana 5011f78160cSXiao Guangrong rcu_read_lock(); 5021f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5031f78160cSXiao Guangrong dev_list) { 5047b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 505f7039b1dSLi Dongyang continue; 506f7039b1dSLi Dongyang num_devices++; 5077b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 508f7039b1dSLi Dongyang minlen); 509f7039b1dSLi Dongyang } 5101f78160cSXiao Guangrong rcu_read_unlock(); 511f4c697e6SLukas Czerner 512f7039b1dSLi Dongyang if (!num_devices) 513f7039b1dSLi Dongyang return -EOPNOTSUPP; 514f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 515f7039b1dSLi Dongyang return -EFAULT; 5166ba9fc8eSQu Wenruo 5176ba9fc8eSQu Wenruo /* 5186ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5196ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5206ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5216ba9fc8eSQu Wenruo */ 5226ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 523f4c697e6SLukas Czerner return -EINVAL; 524f7039b1dSLi Dongyang 525f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5262ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 527f7039b1dSLi Dongyang if (ret < 0) 528f7039b1dSLi Dongyang return ret; 529f7039b1dSLi Dongyang 530f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 531f7039b1dSLi Dongyang return -EFAULT; 532f7039b1dSLi Dongyang 533f7039b1dSLi Dongyang return 0; 534f7039b1dSLi Dongyang } 535f7039b1dSLi Dongyang 536e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 537dd5f9615SStefan Behrens { 53846e0f66aSChris Mason int i; 53946e0f66aSChris Mason 54046e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 54146e0f66aSChris Mason if (uuid[i]) 54246e0f66aSChris Mason return 0; 54346e0f66aSChris Mason } 54446e0f66aSChris Mason return 1; 545dd5f9615SStefan Behrens } 546dd5f9615SStefan Behrens 5473538d68dSOmar Sandoval /* 5483538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5493538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5503538d68dSOmar Sandoval */ 5513538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5523538d68dSOmar Sandoval { 5533538d68dSOmar Sandoval /* 5543538d68dSOmar Sandoval * 1 to add root block 5553538d68dSOmar Sandoval * 1 to add root item 5563538d68dSOmar Sandoval * 1 to add root ref 5573538d68dSOmar Sandoval * 1 to add root backref 5583538d68dSOmar Sandoval * 1 to add UUID item 5593538d68dSOmar Sandoval * 1 to add qgroup info 5603538d68dSOmar Sandoval * 1 to add qgroup limit 5613538d68dSOmar Sandoval * 5623538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5633538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5643538d68dSOmar Sandoval */ 5653538d68dSOmar Sandoval unsigned int num_items = 7; 5663538d68dSOmar Sandoval 5673538d68dSOmar Sandoval if (inherit) { 5683538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5693538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5703538d68dSOmar Sandoval } 5713538d68dSOmar Sandoval return num_items; 5723538d68dSOmar Sandoval } 5733538d68dSOmar Sandoval 5744d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5754d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5768696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 577f46b5a66SChristoph Hellwig { 5780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 579f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 580f46b5a66SChristoph Hellwig struct btrfs_key key; 58149a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 582f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 583f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 584d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 58576dda93cSYan, Zheng struct btrfs_root *new_root; 586d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 58795582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5883538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5893538d68dSOmar Sandoval .dir = dir, 5903538d68dSOmar Sandoval .dentry = dentry, 5913538d68dSOmar Sandoval .subvol = true, 5923538d68dSOmar Sandoval }; 5933538d68dSOmar Sandoval unsigned int trans_num_items; 594f46b5a66SChristoph Hellwig int ret; 5952256e901SOmar Sandoval dev_t anon_dev; 596f46b5a66SChristoph Hellwig u64 objectid; 597f46b5a66SChristoph Hellwig 59849a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 59949a3c4d9SDavid Sterba if (!root_item) 60049a3c4d9SDavid Sterba return -ENOMEM; 60149a3c4d9SDavid Sterba 602543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6032fbe8c8aSAl Viro if (ret) 6042256e901SOmar Sandoval goto out_root_item; 6052dfb1e43SQu Wenruo 606e09fe2d2SQu Wenruo /* 607e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 60801327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 609e09fe2d2SQu Wenruo */ 61049a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 61149a3c4d9SDavid Sterba ret = -ENOSPC; 6122256e901SOmar Sandoval goto out_root_item; 61349a3c4d9SDavid Sterba } 614e09fe2d2SQu Wenruo 6152256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6162256e901SOmar Sandoval if (ret < 0) 6172256e901SOmar Sandoval goto out_root_item; 6182256e901SOmar Sandoval 6193538d68dSOmar Sandoval new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); 6203538d68dSOmar Sandoval if (!new_inode_args.inode) { 621a1fd0c35SOmar Sandoval ret = -ENOMEM; 622a1fd0c35SOmar Sandoval goto out_anon_dev; 623a1fd0c35SOmar Sandoval } 6243538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 625d5c12070SMiao Xie if (ret) 626a1fd0c35SOmar Sandoval goto out_inode; 6273538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6283538d68dSOmar Sandoval 6293538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6303538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6313538d68dSOmar Sandoval trans_num_items, false); 6323538d68dSOmar Sandoval if (ret) 6333538d68dSOmar Sandoval goto out_new_inode_args; 634f46b5a66SChristoph Hellwig 635d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 636d5c12070SMiao Xie if (IS_ERR(trans)) { 637d5c12070SMiao Xie ret = PTR_ERR(trans); 638e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6393538d68dSOmar Sandoval goto out_new_inode_args; 640d5c12070SMiao Xie } 641d5c12070SMiao Xie trans->block_rsv = &block_rsv; 642d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 643f46b5a66SChristoph Hellwig 644a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6456f72c7e2SArne Jansen if (ret) 6462256e901SOmar Sandoval goto out; 6476f72c7e2SArne Jansen 6489631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6499631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6508e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6518e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6522256e901SOmar Sandoval goto out; 6538e8a1e31SJosef Bacik } 654f46b5a66SChristoph Hellwig 655f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 656f46b5a66SChristoph Hellwig 65749a3c4d9SDavid Sterba inode_item = &root_item->inode; 6583cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6593cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6603cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 661da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6620b246afaSJeff Mahoney fs_info->nodesize); 6633cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 664f46b5a66SChristoph Hellwig 66549a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 66649a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6673cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 66808fe4db1SLi Zefan 66949a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 67049a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 67149a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 67249a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 67349a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 67449a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 675f46b5a66SChristoph Hellwig 67649a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 67749a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 678807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 67949a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 68049a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 68149a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 68249a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 68349a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 684f46b5a66SChristoph Hellwig 685925baeddSChris Mason btrfs_tree_unlock(leaf); 686f46b5a66SChristoph Hellwig 68769948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 688f46b5a66SChristoph Hellwig 689f46b5a66SChristoph Hellwig key.objectid = objectid; 6905d4f98a2SYan Zheng key.offset = 0; 691962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6920b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 69349a3c4d9SDavid Sterba root_item); 69467addf29SFilipe Manana if (ret) { 69567addf29SFilipe Manana /* 69667addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 69767addf29SFilipe Manana * tree block so that we don't leak space and leave the 69867addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 6997a163608SFilipe Manana * extent tree with a backreference for a root that does not 700212a58fdSFilipe Manana * exists). 70167addf29SFilipe Manana */ 702212a58fdSFilipe Manana btrfs_tree_lock(leaf); 703212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 704212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7057a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 70667addf29SFilipe Manana free_extent_buffer(leaf); 7072256e901SOmar Sandoval goto out; 70867addf29SFilipe Manana } 70967addf29SFilipe Manana 71067addf29SFilipe Manana free_extent_buffer(leaf); 71167addf29SFilipe Manana leaf = NULL; 712f46b5a66SChristoph Hellwig 7132dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71479787eaaSJeff Mahoney if (IS_ERR(new_root)) { 71579787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7172256e901SOmar Sandoval goto out; 71879787eaaSJeff Mahoney } 7192256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7202dfb1e43SQu Wenruo anon_dev = 0; 7213538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7223538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 72376dda93cSYan, Zheng 724221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 725221581e4SJosef Bacik if (ret) { 726221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7272256e901SOmar Sandoval goto out; 728c7e54b51SJosef Bacik } 7290660b5afSChris Mason 730cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7316bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 732caae78e0SOmar Sandoval if (ret) { 73366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 734caae78e0SOmar Sandoval goto out; 735caae78e0SOmar Sandoval } 736dd5f9615SStefan Behrens 737caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 738caae78e0SOmar Sandoval if (ret) { 739caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 740caae78e0SOmar Sandoval goto out; 741caae78e0SOmar Sandoval } 742caae78e0SOmar Sandoval 743caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 744caae78e0SOmar Sandoval new_inode_args.inode = NULL; 745f46b5a66SChristoph Hellwig 7462256e901SOmar Sandoval out: 747d5c12070SMiao Xie trans->block_rsv = NULL; 748d5c12070SMiao Xie trans->bytes_reserved = 0; 749e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 750de6e8200SLiu Bo 7511b58ae0eSFilipe Manana if (ret) 7521b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7531b58ae0eSFilipe Manana else 7541b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7553538d68dSOmar Sandoval out_new_inode_args: 7563538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 757a1fd0c35SOmar Sandoval out_inode: 7583538d68dSOmar Sandoval iput(new_inode_args.inode); 7592256e901SOmar Sandoval out_anon_dev: 7602dfb1e43SQu Wenruo if (anon_dev) 7612dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7622256e901SOmar Sandoval out_root_item: 76349a3c4d9SDavid Sterba kfree(root_item); 76449a3c4d9SDavid Sterba return ret; 765f46b5a66SChristoph Hellwig } 766f46b5a66SChristoph Hellwig 767e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7689babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 769e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 770f46b5a66SChristoph Hellwig { 7710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7722e4bfab9SYan, Zheng struct inode *inode; 773f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7743538d68dSOmar Sandoval unsigned int trans_num_items; 775f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7762e4bfab9SYan, Zheng int ret; 777f46b5a66SChristoph Hellwig 778813febdbSJosef Bacik /* We do not support snapshotting right now. */ 779813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 780813febdbSJosef Bacik btrfs_warn(fs_info, 781813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 782813febdbSJosef Bacik return -EOPNOTSUPP; 783813febdbSJosef Bacik } 784813febdbSJosef Bacik 78592a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 786f46b5a66SChristoph Hellwig return -EINVAL; 787f46b5a66SChristoph Hellwig 788eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 789eede2bf3SOmar Sandoval btrfs_warn(fs_info, 790eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 791eede2bf3SOmar Sandoval return -ETXTBSY; 792eede2bf3SOmar Sandoval } 793eede2bf3SOmar Sandoval 79423269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 795a1ee7362SDavid Sterba if (!pending_snapshot) 796a1ee7362SDavid Sterba return -ENOMEM; 797a1ee7362SDavid Sterba 7982dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7992dfb1e43SQu Wenruo if (ret < 0) 8002dfb1e43SQu Wenruo goto free_pending; 801b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 80223269bf5SDavid Sterba GFP_KERNEL); 8038546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8048546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 805b0c0ea63SDavid Sterba ret = -ENOMEM; 806b0c0ea63SDavid Sterba goto free_pending; 807b0c0ea63SDavid Sterba } 808b0c0ea63SDavid Sterba 80966d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 81066d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 811d5c12070SMiao Xie /* 8123538d68dSOmar Sandoval * 1 to add dir item 8133538d68dSOmar Sandoval * 1 to add dir index 8143538d68dSOmar Sandoval * 1 to update parent inode item 815d5c12070SMiao Xie */ 8163538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 817d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8183538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8193538d68dSOmar Sandoval trans_num_items, false); 820d5c12070SMiao Xie if (ret) 821c11fbb6eSRobbie Ko goto free_pending; 822d5c12070SMiao Xie 823a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 824a22285a6SYan, Zheng pending_snapshot->root = root; 825b83cc969SLi Zefan pending_snapshot->readonly = readonly; 826e9662f70SMiao Xie pending_snapshot->dir = dir; 8278696c533SMiao Xie pending_snapshot->inherit = inherit; 828a22285a6SYan, Zheng 829d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 830a22285a6SYan, Zheng if (IS_ERR(trans)) { 831a22285a6SYan, Zheng ret = PTR_ERR(trans); 832a22285a6SYan, Zheng goto fail; 833a22285a6SYan, Zheng } 834a22285a6SYan, Zheng 83528b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8369babda9fSNikolay Borisov 8373a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 838aec8030aSMiao Xie if (ret) 839c37b2b62SJosef Bacik goto fail; 840a22285a6SYan, Zheng 841a22285a6SYan, Zheng ret = pending_snapshot->error; 842f46b5a66SChristoph Hellwig if (ret) 8432e4bfab9SYan, Zheng goto fail; 844f46b5a66SChristoph Hellwig 845d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 846d3797308SChris Mason if (ret) 847d3797308SChris Mason goto fail; 848d3797308SChris Mason 8492b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8502e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8512e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8522e4bfab9SYan, Zheng goto fail; 8532e4bfab9SYan, Zheng } 8545662344bSTsutomu Itoh 8552e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8562e4bfab9SYan, Zheng ret = 0; 8572dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8582e4bfab9SYan, Zheng fail: 8592dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8602dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8612dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 86200246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 863e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 864b0c0ea63SDavid Sterba free_pending: 8652dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8662dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 867b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8688546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 869a1ee7362SDavid Sterba kfree(pending_snapshot); 870a1ee7362SDavid Sterba 871f46b5a66SChristoph Hellwig return ret; 872f46b5a66SChristoph Hellwig } 873f46b5a66SChristoph Hellwig 8744260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8754260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8764260f7c7SSage Weil * whether the type of victim is right. 8774260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8784260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8794260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8804260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8814260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8824260f7c7SSage Weil * a. be owner of dir, or 8834260f7c7SSage Weil * b. be owner of victim, or 8844260f7c7SSage Weil * c. have CAP_FOWNER capability 88501327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8864260f7c7SSage Weil * links pointing to it. 8874260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8884260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8894260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8904260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8914260f7c7SSage Weil * nfs_async_unlink(). 8924260f7c7SSage Weil */ 8934260f7c7SSage Weil 894c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 895c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8964260f7c7SSage Weil { 8974260f7c7SSage Weil int error; 8984260f7c7SSage Weil 8992b0143b5SDavid Howells if (d_really_is_negative(victim)) 9004260f7c7SSage Weil return -ENOENT; 9014260f7c7SSage Weil 9022b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9034fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9044260f7c7SSage Weil 905c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 9064260f7c7SSage Weil if (error) 9074260f7c7SSage Weil return error; 9084260f7c7SSage Weil if (IS_APPEND(dir)) 9094260f7c7SSage Weil return -EPERM; 910c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 911ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 912ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9134260f7c7SSage Weil return -EPERM; 9144260f7c7SSage Weil if (isdir) { 915e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9164260f7c7SSage Weil return -ENOTDIR; 9174260f7c7SSage Weil if (IS_ROOT(victim)) 9184260f7c7SSage Weil return -EBUSY; 919e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9204260f7c7SSage Weil return -EISDIR; 9214260f7c7SSage Weil if (IS_DEADDIR(dir)) 9224260f7c7SSage Weil return -ENOENT; 9234260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9244260f7c7SSage Weil return -EBUSY; 9254260f7c7SSage Weil return 0; 9264260f7c7SSage Weil } 9274260f7c7SSage Weil 928cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9294d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9304d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 931cb8e7090SChristoph Hellwig { 9322b0143b5SDavid Howells if (d_really_is_positive(child)) 933cb8e7090SChristoph Hellwig return -EEXIST; 934cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 935cb8e7090SChristoph Hellwig return -ENOENT; 9364d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9375474bf40SChristian Brauner return -EOVERFLOW; 9384d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 939cb8e7090SChristoph Hellwig } 940cb8e7090SChristoph Hellwig 941cb8e7090SChristoph Hellwig /* 942cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 943cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 944cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 945cb8e7090SChristoph Hellwig */ 94692872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9474d4340c9SChristian Brauner struct user_namespace *mnt_userns, 94852f75f4fSDavid Sterba const char *name, int namelen, 94972fd032eSSage Weil struct btrfs_root *snap_src, 9509babda9fSNikolay Borisov bool readonly, 9518696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 952cb8e7090SChristoph Hellwig { 9532b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9540b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 955cb8e7090SChristoph Hellwig struct dentry *dentry; 9566db75318SSweet Tea Dorminy struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); 957cb8e7090SChristoph Hellwig int error; 958cb8e7090SChristoph Hellwig 95900235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96000235411SAl Viro if (error == -EINTR) 96100235411SAl Viro return error; 962cb8e7090SChristoph Hellwig 9634d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 964cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 965cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 966cb8e7090SChristoph Hellwig goto out_unlock; 967cb8e7090SChristoph Hellwig 9684d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 969cb8e7090SChristoph Hellwig if (error) 970a874a63eSLiu Bo goto out_dput; 971cb8e7090SChristoph Hellwig 9729c52057cSChris Mason /* 9739c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9749c52057cSChris Mason * check for them now when we can safely fail 9759c52057cSChris Mason */ 9769c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 977e43eec81SSweet Tea Dorminy dir->i_ino, &name_str); 9789c52057cSChris Mason if (error) 9799c52057cSChris Mason goto out_dput; 9809c52057cSChris Mason 9810b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 98276dda93cSYan, Zheng 98376dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98476dda93cSYan, Zheng goto out_up_read; 98576dda93cSYan, Zheng 9869babda9fSNikolay Borisov if (snap_src) 9879babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9889babda9fSNikolay Borisov else 98970dc55f4SOmar Sandoval error = create_subvol(mnt_userns, dir, dentry, inherit); 9909babda9fSNikolay Borisov 99176dda93cSYan, Zheng if (!error) 99276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99376dda93cSYan, Zheng out_up_read: 9940b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 995cb8e7090SChristoph Hellwig out_dput: 996cb8e7090SChristoph Hellwig dput(dentry); 997cb8e7090SChristoph Hellwig out_unlock: 99864708539SJosef Bacik btrfs_inode_unlock(dir, 0); 999cb8e7090SChristoph Hellwig return error; 1000cb8e7090SChristoph Hellwig } 1001cb8e7090SChristoph Hellwig 1002c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10034d4340c9SChristian Brauner struct user_namespace *mnt_userns, 1004c11fbb6eSRobbie Ko const char *name, int namelen, 1005c11fbb6eSRobbie Ko struct btrfs_root *root, 1006c11fbb6eSRobbie Ko bool readonly, 1007c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1008c11fbb6eSRobbie Ko { 1009c11fbb6eSRobbie Ko int ret; 1010c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1011c11fbb6eSRobbie Ko 1012c11fbb6eSRobbie Ko /* 1013c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1014c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1015c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1016c11fbb6eSRobbie Ko */ 1017c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1018c11fbb6eSRobbie Ko 1019f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1020c11fbb6eSRobbie Ko if (ret) 1021c11fbb6eSRobbie Ko goto out; 1022c11fbb6eSRobbie Ko 1023c11fbb6eSRobbie Ko /* 1024c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1025c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1026c11fbb6eSRobbie Ko * creation. 1027c11fbb6eSRobbie Ko */ 1028c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1029c11fbb6eSRobbie Ko snapshot_force_cow = true; 1030c11fbb6eSRobbie Ko 1031c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1032c11fbb6eSRobbie Ko 10334d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1034c11fbb6eSRobbie Ko root, readonly, inherit); 1035c11fbb6eSRobbie Ko out: 1036c11fbb6eSRobbie Ko if (snapshot_force_cow) 1037c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1038c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1039c11fbb6eSRobbie Ko return ret; 1040c11fbb6eSRobbie Ko } 1041c11fbb6eSRobbie Ko 1042d5633b0dSQu Wenruo /* 1043d5633b0dSQu Wenruo * Defrag specific helper to get an extent map. 1044d5633b0dSQu Wenruo * 1045d5633b0dSQu Wenruo * Differences between this and btrfs_get_extent() are: 1046d5633b0dSQu Wenruo * 1047d5633b0dSQu Wenruo * - No extent_map will be added to inode->extent_tree 1048d5633b0dSQu Wenruo * To reduce memory usage in the long run. 1049d5633b0dSQu Wenruo * 1050d5633b0dSQu Wenruo * - Extra optimization to skip file extents older than @newer_than 1051d5633b0dSQu Wenruo * By using btrfs_search_forward() we can skip entire file ranges that 1052d5633b0dSQu Wenruo * have extents created in past transactions, because btrfs_search_forward() 1053d5633b0dSQu Wenruo * will not visit leaves and nodes with a generation smaller than given 1054d5633b0dSQu Wenruo * minimal generation threshold (@newer_than). 1055d5633b0dSQu Wenruo * 1056d5633b0dSQu Wenruo * Return valid em if we find a file extent matching the requirement. 1057d5633b0dSQu Wenruo * Return NULL if we can not find a file extent matching the requirement. 1058d5633b0dSQu Wenruo * 1059d5633b0dSQu Wenruo * Return ERR_PTR() for error. 1060d5633b0dSQu Wenruo */ 1061d5633b0dSQu Wenruo static struct extent_map *defrag_get_extent(struct btrfs_inode *inode, 1062d5633b0dSQu Wenruo u64 start, u64 newer_than) 1063d5633b0dSQu Wenruo { 1064d5633b0dSQu Wenruo struct btrfs_root *root = inode->root; 1065d5633b0dSQu Wenruo struct btrfs_file_extent_item *fi; 1066d5633b0dSQu Wenruo struct btrfs_path path = { 0 }; 1067d5633b0dSQu Wenruo struct extent_map *em; 1068d5633b0dSQu Wenruo struct btrfs_key key; 1069d5633b0dSQu Wenruo u64 ino = btrfs_ino(inode); 1070d5633b0dSQu Wenruo int ret; 1071d5633b0dSQu Wenruo 1072d5633b0dSQu Wenruo em = alloc_extent_map(); 1073d5633b0dSQu Wenruo if (!em) { 1074d5633b0dSQu Wenruo ret = -ENOMEM; 1075d5633b0dSQu Wenruo goto err; 1076d5633b0dSQu Wenruo } 1077d5633b0dSQu Wenruo 1078d5633b0dSQu Wenruo key.objectid = ino; 1079d5633b0dSQu Wenruo key.type = BTRFS_EXTENT_DATA_KEY; 1080d5633b0dSQu Wenruo key.offset = start; 1081d5633b0dSQu Wenruo 1082d5633b0dSQu Wenruo if (newer_than) { 1083d5633b0dSQu Wenruo ret = btrfs_search_forward(root, &key, &path, newer_than); 1084d5633b0dSQu Wenruo if (ret < 0) 1085d5633b0dSQu Wenruo goto err; 1086d5633b0dSQu Wenruo /* Can't find anything newer */ 1087d5633b0dSQu Wenruo if (ret > 0) 1088d5633b0dSQu Wenruo goto not_found; 1089d5633b0dSQu Wenruo } else { 1090d5633b0dSQu Wenruo ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); 1091d5633b0dSQu Wenruo if (ret < 0) 1092d5633b0dSQu Wenruo goto err; 1093d5633b0dSQu Wenruo } 1094d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { 1095d5633b0dSQu Wenruo /* 1096d5633b0dSQu Wenruo * If btrfs_search_slot() makes path to point beyond nritems, 1097d5633b0dSQu Wenruo * we should not have an empty leaf, as this inode must at 1098d5633b0dSQu Wenruo * least have its INODE_ITEM. 1099d5633b0dSQu Wenruo */ 1100d5633b0dSQu Wenruo ASSERT(btrfs_header_nritems(path.nodes[0])); 1101d5633b0dSQu Wenruo path.slots[0] = btrfs_header_nritems(path.nodes[0]) - 1; 1102d5633b0dSQu Wenruo } 1103d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1104d5633b0dSQu Wenruo /* Perfect match, no need to go one slot back */ 1105d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY && 1106d5633b0dSQu Wenruo key.offset == start) 1107d5633b0dSQu Wenruo goto iterate; 1108d5633b0dSQu Wenruo 1109d5633b0dSQu Wenruo /* We didn't find a perfect match, needs to go one slot back */ 1110d5633b0dSQu Wenruo if (path.slots[0] > 0) { 1111d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1112d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY) 1113d5633b0dSQu Wenruo path.slots[0]--; 1114d5633b0dSQu Wenruo } 1115d5633b0dSQu Wenruo 1116d5633b0dSQu Wenruo iterate: 1117d5633b0dSQu Wenruo /* Iterate through the path to find a file extent covering @start */ 1118d5633b0dSQu Wenruo while (true) { 1119d5633b0dSQu Wenruo u64 extent_end; 1120d5633b0dSQu Wenruo 1121d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) 1122d5633b0dSQu Wenruo goto next; 1123d5633b0dSQu Wenruo 1124d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1125d5633b0dSQu Wenruo 1126d5633b0dSQu Wenruo /* 1127d5633b0dSQu Wenruo * We may go one slot back to INODE_REF/XATTR item, then 1128d5633b0dSQu Wenruo * need to go forward until we reach an EXTENT_DATA. 1129d5633b0dSQu Wenruo * But we should still has the correct ino as key.objectid. 1130d5633b0dSQu Wenruo */ 1131d5633b0dSQu Wenruo if (WARN_ON(key.objectid < ino) || key.type < BTRFS_EXTENT_DATA_KEY) 1132d5633b0dSQu Wenruo goto next; 1133d5633b0dSQu Wenruo 1134d5633b0dSQu Wenruo /* It's beyond our target range, definitely not extent found */ 1135d5633b0dSQu Wenruo if (key.objectid > ino || key.type > BTRFS_EXTENT_DATA_KEY) 1136d5633b0dSQu Wenruo goto not_found; 1137d5633b0dSQu Wenruo 1138d5633b0dSQu Wenruo /* 1139d5633b0dSQu Wenruo * | |<- File extent ->| 1140d5633b0dSQu Wenruo * \- start 1141d5633b0dSQu Wenruo * 1142d5633b0dSQu Wenruo * This means there is a hole between start and key.offset. 1143d5633b0dSQu Wenruo */ 1144d5633b0dSQu Wenruo if (key.offset > start) { 1145d5633b0dSQu Wenruo em->start = start; 1146d5633b0dSQu Wenruo em->orig_start = start; 1147d5633b0dSQu Wenruo em->block_start = EXTENT_MAP_HOLE; 1148d5633b0dSQu Wenruo em->len = key.offset - start; 1149d5633b0dSQu Wenruo break; 1150d5633b0dSQu Wenruo } 1151d5633b0dSQu Wenruo 1152d5633b0dSQu Wenruo fi = btrfs_item_ptr(path.nodes[0], path.slots[0], 1153d5633b0dSQu Wenruo struct btrfs_file_extent_item); 1154d5633b0dSQu Wenruo extent_end = btrfs_file_extent_end(&path); 1155d5633b0dSQu Wenruo 1156d5633b0dSQu Wenruo /* 1157d5633b0dSQu Wenruo * |<- file extent ->| | 1158d5633b0dSQu Wenruo * \- start 1159d5633b0dSQu Wenruo * 1160d5633b0dSQu Wenruo * We haven't reached start, search next slot. 1161d5633b0dSQu Wenruo */ 1162d5633b0dSQu Wenruo if (extent_end <= start) 1163d5633b0dSQu Wenruo goto next; 1164d5633b0dSQu Wenruo 1165d5633b0dSQu Wenruo /* Now this extent covers @start, convert it to em */ 1166d5633b0dSQu Wenruo btrfs_extent_item_to_extent_map(inode, &path, fi, false, em); 1167d5633b0dSQu Wenruo break; 1168d5633b0dSQu Wenruo next: 1169d5633b0dSQu Wenruo ret = btrfs_next_item(root, &path); 1170d5633b0dSQu Wenruo if (ret < 0) 1171d5633b0dSQu Wenruo goto err; 1172d5633b0dSQu Wenruo if (ret > 0) 1173d5633b0dSQu Wenruo goto not_found; 1174d5633b0dSQu Wenruo } 1175d5633b0dSQu Wenruo btrfs_release_path(&path); 1176d5633b0dSQu Wenruo return em; 1177d5633b0dSQu Wenruo 1178d5633b0dSQu Wenruo not_found: 1179d5633b0dSQu Wenruo btrfs_release_path(&path); 1180d5633b0dSQu Wenruo free_extent_map(em); 1181d5633b0dSQu Wenruo return NULL; 1182d5633b0dSQu Wenruo 1183d5633b0dSQu Wenruo err: 1184d5633b0dSQu Wenruo btrfs_release_path(&path); 1185d5633b0dSQu Wenruo free_extent_map(em); 1186d5633b0dSQu Wenruo return ERR_PTR(ret); 1187d5633b0dSQu Wenruo } 1188d5633b0dSQu Wenruo 1189e9eec721SQu Wenruo static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, 1190d5633b0dSQu Wenruo u64 newer_than, bool locked) 119117ce6ef8SLiu Bo { 119217ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1193940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11946c282eb4SLi Zefan struct extent_map *em; 119576068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1196940100a4SChris Mason 1197940100a4SChris Mason /* 1198940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1199940100a4SChris Mason * the full extent lock 1200940100a4SChris Mason */ 1201940100a4SChris Mason read_lock(&em_tree->lock); 120276068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1203940100a4SChris Mason read_unlock(&em_tree->lock); 1204940100a4SChris Mason 1205199257a7SQu Wenruo /* 1206199257a7SQu Wenruo * We can get a merged extent, in that case, we need to re-search 1207199257a7SQu Wenruo * tree to get the original em for defrag. 1208199257a7SQu Wenruo * 1209199257a7SQu Wenruo * If @newer_than is 0 or em::generation < newer_than, we can trust 1210199257a7SQu Wenruo * this em, as either we don't care about the generation, or the 1211199257a7SQu Wenruo * merged extent map will be rejected anyway. 1212199257a7SQu Wenruo */ 1213199257a7SQu Wenruo if (em && test_bit(EXTENT_FLAG_MERGED, &em->flags) && 1214199257a7SQu Wenruo newer_than && em->generation >= newer_than) { 1215199257a7SQu Wenruo free_extent_map(em); 1216199257a7SQu Wenruo em = NULL; 1217199257a7SQu Wenruo } 1218199257a7SQu Wenruo 1219940100a4SChris Mason if (!em) { 1220308d9800SFilipe Manana struct extent_state *cached = NULL; 122176068caeSQu Wenruo u64 end = start + sectorsize - 1; 1222308d9800SFilipe Manana 1223940100a4SChris Mason /* get the big lock and read metadata off disk */ 1224e9eec721SQu Wenruo if (!locked) 1225570eb97bSJosef Bacik lock_extent(io_tree, start, end, &cached); 1226d5633b0dSQu Wenruo em = defrag_get_extent(BTRFS_I(inode), start, newer_than); 1227e9eec721SQu Wenruo if (!locked) 1228570eb97bSJosef Bacik unlock_extent(io_tree, start, end, &cached); 1229940100a4SChris Mason 12306cf8bfbfSDan Carpenter if (IS_ERR(em)) 12316c282eb4SLi Zefan return NULL; 1232940100a4SChris Mason } 1233940100a4SChris Mason 12346c282eb4SLi Zefan return em; 12356c282eb4SLi Zefan } 12366c282eb4SLi Zefan 1237d7601566SNaohiro Aota static u32 get_extent_max_capacity(const struct btrfs_fs_info *fs_info, 1238d7601566SNaohiro Aota const struct extent_map *em) 1239979b25c3SQu Wenruo { 1240979b25c3SQu Wenruo if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) 1241979b25c3SQu Wenruo return BTRFS_MAX_COMPRESSED; 1242d7601566SNaohiro Aota return fs_info->max_extent_size; 1243979b25c3SQu Wenruo } 1244979b25c3SQu Wenruo 1245e9eec721SQu Wenruo static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, 124675a36a7dSQu Wenruo u32 extent_thresh, u64 newer_than, bool locked) 12476c282eb4SLi Zefan { 1248d7601566SNaohiro Aota struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 12496c282eb4SLi Zefan struct extent_map *next; 12507093f152SQu Wenruo bool ret = false; 12516c282eb4SLi Zefan 12526c282eb4SLi Zefan /* this is the last extent */ 12536c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12546c282eb4SLi Zefan return false; 12556c282eb4SLi Zefan 1256d5633b0dSQu Wenruo /* 125775a36a7dSQu Wenruo * Here we need to pass @newer_then when checking the next extent, or 125875a36a7dSQu Wenruo * we will hit a case we mark current extent for defrag, but the next 125975a36a7dSQu Wenruo * one will not be a target. 126075a36a7dSQu Wenruo * This will just cause extra IO without really reducing the fragments. 1261d5633b0dSQu Wenruo */ 126275a36a7dSQu Wenruo next = defrag_lookup_extent(inode, em->start + em->len, newer_than, locked); 12637093f152SQu Wenruo /* No more em or hole */ 1264e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 12657093f152SQu Wenruo goto out; 12667093f152SQu Wenruo if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags)) 12677093f152SQu Wenruo goto out; 1268979b25c3SQu Wenruo /* 1269979b25c3SQu Wenruo * If the next extent is at its max capacity, defragging current extent 1270979b25c3SQu Wenruo * makes no sense, as the total number of extents won't change. 1271979b25c3SQu Wenruo */ 1272d7601566SNaohiro Aota if (next->len >= get_extent_max_capacity(fs_info, em)) 1273979b25c3SQu Wenruo goto out; 127475a36a7dSQu Wenruo /* Skip older extent */ 127575a36a7dSQu Wenruo if (next->generation < newer_than) 127675a36a7dSQu Wenruo goto out; 127775a36a7dSQu Wenruo /* Also check extent size */ 127875a36a7dSQu Wenruo if (next->len >= extent_thresh) 127975a36a7dSQu Wenruo goto out; 128075a36a7dSQu Wenruo 12817093f152SQu Wenruo ret = true; 12827093f152SQu Wenruo out: 12836c282eb4SLi Zefan free_extent_map(next); 12846c282eb4SLi Zefan return ret; 12856c282eb4SLi Zefan } 12866c282eb4SLi Zefan 12874cb5300bSChris Mason /* 12885767b50cSQu Wenruo * Prepare one page to be defragged. 12895767b50cSQu Wenruo * 12905767b50cSQu Wenruo * This will ensure: 12915767b50cSQu Wenruo * 12925767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12935767b50cSQu Wenruo * - No ordered extent exists in the page. 12945767b50cSQu Wenruo * - The page is uptodate. 12955767b50cSQu Wenruo * 12965767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12975767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12985767b50cSQu Wenruo */ 12995767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 13005767b50cSQu Wenruo pgoff_t index) 1301940100a4SChris Mason { 13025767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 13035767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 13045767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 13055767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 13064cb5300bSChris Mason struct extent_state *cached_state = NULL; 13074cb5300bSChris Mason struct page *page; 13085767b50cSQu Wenruo int ret; 13095767b50cSQu Wenruo 1310600a45e1SMiao Xie again: 13115767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 13124cb5300bSChris Mason if (!page) 13135767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 13145767b50cSQu Wenruo 131524bcb454SOmar Sandoval /* 131624bcb454SOmar Sandoval * Since we can defragment files opened read-only, we can encounter 131724bcb454SOmar Sandoval * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We 131824bcb454SOmar Sandoval * can't do I/O using huge pages yet, so return an error for now. 131924bcb454SOmar Sandoval * Filesystem transparent huge pages are typically only used for 132024bcb454SOmar Sandoval * executables that explicitly enable them, so this isn't very 132124bcb454SOmar Sandoval * restrictive. 132224bcb454SOmar Sandoval */ 132324bcb454SOmar Sandoval if (PageCompound(page)) { 132424bcb454SOmar Sandoval unlock_page(page); 132524bcb454SOmar Sandoval put_page(page); 132624bcb454SOmar Sandoval return ERR_PTR(-ETXTBSY); 132724bcb454SOmar Sandoval } 13284cb5300bSChris Mason 132932443de3SQu Wenruo ret = set_page_extent_mapped(page); 133032443de3SQu Wenruo if (ret < 0) { 133132443de3SQu Wenruo unlock_page(page); 133232443de3SQu Wenruo put_page(page); 13335767b50cSQu Wenruo return ERR_PTR(ret); 133432443de3SQu Wenruo } 133532443de3SQu Wenruo 13365767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 1337600a45e1SMiao Xie while (1) { 13385767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 13395767b50cSQu Wenruo 1340570eb97bSJosef Bacik lock_extent(&inode->io_tree, page_start, page_end, &cached_state); 13415767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 1342570eb97bSJosef Bacik unlock_extent(&inode->io_tree, page_start, page_end, 1343e43bbe5eSDavid Sterba &cached_state); 1344600a45e1SMiao Xie if (!ordered) 1345600a45e1SMiao Xie break; 1346600a45e1SMiao Xie 1347600a45e1SMiao Xie unlock_page(page); 1348c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1349600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1350600a45e1SMiao Xie lock_page(page); 13511f12bd06SLiu Bo /* 13525767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 13535767b50cSQu Wenruo * released or not. 13541f12bd06SLiu Bo */ 13555767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 13561f12bd06SLiu Bo unlock_page(page); 135709cbfeafSKirill A. Shutemov put_page(page); 13581f12bd06SLiu Bo goto again; 13591f12bd06SLiu Bo } 1360600a45e1SMiao Xie } 1361600a45e1SMiao Xie 13625767b50cSQu Wenruo /* 13635767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 13645767b50cSQu Wenruo * make it uptodate. 13655767b50cSQu Wenruo */ 13664cb5300bSChris Mason if (!PageUptodate(page)) { 1367fb12489bSMatthew Wilcox (Oracle) btrfs_read_folio(NULL, page_folio(page)); 13684cb5300bSChris Mason lock_page(page); 13695767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 1370600a45e1SMiao Xie unlock_page(page); 137109cbfeafSKirill A. Shutemov put_page(page); 1372600a45e1SMiao Xie goto again; 1373600a45e1SMiao Xie } 13745767b50cSQu Wenruo if (!PageUptodate(page)) { 13755767b50cSQu Wenruo unlock_page(page); 13765767b50cSQu Wenruo put_page(page); 13775767b50cSQu Wenruo return ERR_PTR(-EIO); 13784cb5300bSChris Mason } 13795767b50cSQu Wenruo } 13805767b50cSQu Wenruo return page; 13815767b50cSQu Wenruo } 13824cb5300bSChris Mason 1383eb793cf8SQu Wenruo struct defrag_target_range { 1384eb793cf8SQu Wenruo struct list_head list; 1385eb793cf8SQu Wenruo u64 start; 1386eb793cf8SQu Wenruo u64 len; 1387eb793cf8SQu Wenruo }; 13884cb5300bSChris Mason 13894cb5300bSChris Mason /* 1390eb793cf8SQu Wenruo * Collect all valid target extents. 1391eb793cf8SQu Wenruo * 1392eb793cf8SQu Wenruo * @start: file offset to lookup 1393eb793cf8SQu Wenruo * @len: length to lookup 1394eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1395eb793cf8SQu Wenruo * will be ignored 1396eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1397eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1398eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1399eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1400e9eec721SQu Wenruo * @locked: if the range has already held extent lock 1401eb793cf8SQu Wenruo * @target_list: list of targets file extents 14024cb5300bSChris Mason */ 1403eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1404eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1405eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1406966d879bSQu Wenruo bool locked, struct list_head *target_list, 1407966d879bSQu Wenruo u64 *last_scanned_ret) 1408eb793cf8SQu Wenruo { 1409d7601566SNaohiro Aota struct btrfs_fs_info *fs_info = inode->root->fs_info; 1410966d879bSQu Wenruo bool last_is_target = false; 1411eb793cf8SQu Wenruo u64 cur = start; 1412eb793cf8SQu Wenruo int ret = 0; 1413eb793cf8SQu Wenruo 1414eb793cf8SQu Wenruo while (cur < start + len) { 1415eb793cf8SQu Wenruo struct extent_map *em; 1416eb793cf8SQu Wenruo struct defrag_target_range *new; 1417eb793cf8SQu Wenruo bool next_mergeable = true; 1418eb793cf8SQu Wenruo u64 range_len; 1419eb793cf8SQu Wenruo 1420966d879bSQu Wenruo last_is_target = false; 1421d5633b0dSQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur, 1422d5633b0dSQu Wenruo newer_than, locked); 1423eb793cf8SQu Wenruo if (!em) 1424eb793cf8SQu Wenruo break; 1425eb793cf8SQu Wenruo 1426d8101a0cSQu Wenruo /* 1427d8101a0cSQu Wenruo * If the file extent is an inlined one, we may still want to 1428d8101a0cSQu Wenruo * defrag it (fallthrough) if it will cause a regular extent. 1429d8101a0cSQu Wenruo * This is for users who want to convert inline extents to 1430d8101a0cSQu Wenruo * regular ones through max_inline= mount option. 1431d8101a0cSQu Wenruo */ 1432d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_INLINE && 1433d8101a0cSQu Wenruo em->len <= inode->root->fs_info->max_inline) 1434d8101a0cSQu Wenruo goto next; 1435d8101a0cSQu Wenruo 1436d8101a0cSQu Wenruo /* Skip hole/delalloc/preallocated extents */ 1437d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_HOLE || 1438d8101a0cSQu Wenruo em->block_start == EXTENT_MAP_DELALLOC || 1439eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1440eb793cf8SQu Wenruo goto next; 1441eb793cf8SQu Wenruo 1442eb793cf8SQu Wenruo /* Skip older extent */ 1443eb793cf8SQu Wenruo if (em->generation < newer_than) 1444eb793cf8SQu Wenruo goto next; 1445eb793cf8SQu Wenruo 14460d1ffa22SQu Wenruo /* This em is under writeback, no need to defrag */ 14470d1ffa22SQu Wenruo if (em->generation == (u64)-1) 14480d1ffa22SQu Wenruo goto next; 14490d1ffa22SQu Wenruo 1450eb793cf8SQu Wenruo /* 14510cb5950fSFilipe Manana * Our start offset might be in the middle of an existing extent 14520cb5950fSFilipe Manana * map, so take that into account. 14530cb5950fSFilipe Manana */ 14540cb5950fSFilipe Manana range_len = em->len - (cur - em->start); 14550cb5950fSFilipe Manana /* 14560cb5950fSFilipe Manana * If this range of the extent map is already flagged for delalloc, 14570cb5950fSFilipe Manana * skip it, because: 14580cb5950fSFilipe Manana * 14590cb5950fSFilipe Manana * 1) We could deadlock later, when trying to reserve space for 14600cb5950fSFilipe Manana * delalloc, because in case we can't immediately reserve space 14610cb5950fSFilipe Manana * the flusher can start delalloc and wait for the respective 14620cb5950fSFilipe Manana * ordered extents to complete. The deadlock would happen 14630cb5950fSFilipe Manana * because we do the space reservation while holding the range 14640cb5950fSFilipe Manana * locked, and starting writeback, or finishing an ordered 14650cb5950fSFilipe Manana * extent, requires locking the range; 14660cb5950fSFilipe Manana * 14670cb5950fSFilipe Manana * 2) If there's delalloc there, it means there's dirty pages for 14680cb5950fSFilipe Manana * which writeback has not started yet (we clean the delalloc 14690cb5950fSFilipe Manana * flag when starting writeback and after creating an ordered 14700cb5950fSFilipe Manana * extent). If we mark pages in an adjacent range for defrag, 14710cb5950fSFilipe Manana * then we will have a larger contiguous range for delalloc, 14720cb5950fSFilipe Manana * very likely resulting in a larger extent after writeback is 14730cb5950fSFilipe Manana * triggered (except in a case of free space fragmentation). 14740cb5950fSFilipe Manana */ 14750cb5950fSFilipe Manana if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1, 14760cb5950fSFilipe Manana EXTENT_DELALLOC, 0, NULL)) 14770cb5950fSFilipe Manana goto next; 14780cb5950fSFilipe Manana 14790cb5950fSFilipe Manana /* 1480eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1481eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1482eb793cf8SQu Wenruo */ 1483eb793cf8SQu Wenruo if (do_compress) 1484eb793cf8SQu Wenruo goto add; 1485eb793cf8SQu Wenruo 1486eb793cf8SQu Wenruo /* Skip too large extent */ 14870cb5950fSFilipe Manana if (range_len >= extent_thresh) 1488eb793cf8SQu Wenruo goto next; 1489eb793cf8SQu Wenruo 1490979b25c3SQu Wenruo /* 1491979b25c3SQu Wenruo * Skip extents already at its max capacity, this is mostly for 1492979b25c3SQu Wenruo * compressed extents, which max cap is only 128K. 1493979b25c3SQu Wenruo */ 1494d7601566SNaohiro Aota if (em->len >= get_extent_max_capacity(fs_info, em)) 1495979b25c3SQu Wenruo goto next; 1496979b25c3SQu Wenruo 1497d8101a0cSQu Wenruo /* 1498d8101a0cSQu Wenruo * Normally there are no more extents after an inline one, thus 1499d8101a0cSQu Wenruo * @next_mergeable will normally be false and not defragged. 1500d8101a0cSQu Wenruo * So if an inline extent passed all above checks, just add it 1501d8101a0cSQu Wenruo * for defrag, and be converted to regular extents. 1502d8101a0cSQu Wenruo */ 1503d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_INLINE) 1504d8101a0cSQu Wenruo goto add; 1505d8101a0cSQu Wenruo 1506e9eec721SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, 150775a36a7dSQu Wenruo extent_thresh, newer_than, locked); 1508eb793cf8SQu Wenruo if (!next_mergeable) { 1509eb793cf8SQu Wenruo struct defrag_target_range *last; 1510eb793cf8SQu Wenruo 1511eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1512eb793cf8SQu Wenruo if (list_empty(target_list)) 1513eb793cf8SQu Wenruo goto next; 1514eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1515eb793cf8SQu Wenruo struct defrag_target_range, list); 1516eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1517eb793cf8SQu Wenruo if (last->start + last->len != cur) 1518eb793cf8SQu Wenruo goto next; 1519eb793cf8SQu Wenruo 1520eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1521eb793cf8SQu Wenruo } 1522eb793cf8SQu Wenruo 1523eb793cf8SQu Wenruo add: 1524966d879bSQu Wenruo last_is_target = true; 1525eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1526eb793cf8SQu Wenruo /* 1527eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1528eb793cf8SQu Wenruo * last range of the target list. 1529eb793cf8SQu Wenruo */ 1530eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1531eb793cf8SQu Wenruo struct defrag_target_range *last; 1532eb793cf8SQu Wenruo 1533eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1534eb793cf8SQu Wenruo struct defrag_target_range, list); 1535eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1536eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1537eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1538eb793cf8SQu Wenruo last->len += range_len; 1539eb793cf8SQu Wenruo goto next; 1540eb793cf8SQu Wenruo } 1541eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1542eb793cf8SQu Wenruo } 1543eb793cf8SQu Wenruo 1544eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1545eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1546eb793cf8SQu Wenruo if (!new) { 1547eb793cf8SQu Wenruo free_extent_map(em); 1548eb793cf8SQu Wenruo ret = -ENOMEM; 1549eb793cf8SQu Wenruo break; 1550eb793cf8SQu Wenruo } 1551eb793cf8SQu Wenruo new->start = cur; 1552eb793cf8SQu Wenruo new->len = range_len; 1553eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1554eb793cf8SQu Wenruo 1555eb793cf8SQu Wenruo next: 1556eb793cf8SQu Wenruo cur = extent_map_end(em); 1557eb793cf8SQu Wenruo free_extent_map(em); 1558eb793cf8SQu Wenruo } 1559eb793cf8SQu Wenruo if (ret < 0) { 1560eb793cf8SQu Wenruo struct defrag_target_range *entry; 1561eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1562eb793cf8SQu Wenruo 1563eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1564eb793cf8SQu Wenruo list_del_init(&entry->list); 1565eb793cf8SQu Wenruo kfree(entry); 1566eb793cf8SQu Wenruo } 1567eb793cf8SQu Wenruo } 1568966d879bSQu Wenruo if (!ret && last_scanned_ret) { 1569966d879bSQu Wenruo /* 1570966d879bSQu Wenruo * If the last extent is not a target, the caller can skip to 1571966d879bSQu Wenruo * the end of that extent. 1572966d879bSQu Wenruo * Otherwise, we can only go the end of the specified range. 1573966d879bSQu Wenruo */ 1574966d879bSQu Wenruo if (!last_is_target) 1575966d879bSQu Wenruo *last_scanned_ret = max(cur, *last_scanned_ret); 1576966d879bSQu Wenruo else 1577966d879bSQu Wenruo *last_scanned_ret = max(start + len, *last_scanned_ret); 1578966d879bSQu Wenruo } 1579eb793cf8SQu Wenruo return ret; 1580eb793cf8SQu Wenruo } 1581eb793cf8SQu Wenruo 158222b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 1583a55e65b8SDavid Sterba static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 158422b398eeSQu Wenruo 158522b398eeSQu Wenruo /* 158622b398eeSQu Wenruo * Defrag one contiguous target range. 158722b398eeSQu Wenruo * 158822b398eeSQu Wenruo * @inode: target inode 158922b398eeSQu Wenruo * @target: target range to defrag 159022b398eeSQu Wenruo * @pages: locked pages covering the defrag range 159122b398eeSQu Wenruo * @nr_pages: number of locked pages 159222b398eeSQu Wenruo * 159322b398eeSQu Wenruo * Caller should ensure: 159422b398eeSQu Wenruo * 159522b398eeSQu Wenruo * - Pages are prepared 159622b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 159722b398eeSQu Wenruo * no writeback. 159822b398eeSQu Wenruo * 159922b398eeSQu Wenruo * - Extent bits are locked 160022b398eeSQu Wenruo */ 160122b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 160222b398eeSQu Wenruo struct defrag_target_range *target, 160322b398eeSQu Wenruo struct page **pages, int nr_pages, 160422b398eeSQu Wenruo struct extent_state **cached_state) 160522b398eeSQu Wenruo { 160622b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 160722b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 160822b398eeSQu Wenruo const u64 start = target->start; 160922b398eeSQu Wenruo const u64 len = target->len; 161022b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 161122b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 161222b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 161322b398eeSQu Wenruo int ret = 0; 161422b398eeSQu Wenruo int i; 161522b398eeSQu Wenruo 161622b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 161722b398eeSQu Wenruo 161822b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 161922b398eeSQu Wenruo if (ret < 0) 162022b398eeSQu Wenruo return ret; 162122b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 162222b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1623bd015294SJosef Bacik EXTENT_DEFRAG, cached_state); 162422b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 162522b398eeSQu Wenruo 162622b398eeSQu Wenruo /* Update the page status */ 162722b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 162822b398eeSQu Wenruo ClearPageChecked(pages[i]); 162922b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 163022b398eeSQu Wenruo } 163122b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 163222b398eeSQu Wenruo extent_changeset_free(data_reserved); 163322b398eeSQu Wenruo 163422b398eeSQu Wenruo return ret; 163522b398eeSQu Wenruo } 163622b398eeSQu Wenruo 1637e9eec721SQu Wenruo static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, 1638966d879bSQu Wenruo u32 extent_thresh, u64 newer_than, bool do_compress, 1639966d879bSQu Wenruo u64 *last_scanned_ret) 1640e9eec721SQu Wenruo { 1641e9eec721SQu Wenruo struct extent_state *cached_state = NULL; 1642e9eec721SQu Wenruo struct defrag_target_range *entry; 1643e9eec721SQu Wenruo struct defrag_target_range *tmp; 1644e9eec721SQu Wenruo LIST_HEAD(target_list); 1645e9eec721SQu Wenruo struct page **pages; 1646e9eec721SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1647e9eec721SQu Wenruo u64 last_index = (start + len - 1) >> PAGE_SHIFT; 1648e9eec721SQu Wenruo u64 start_index = start >> PAGE_SHIFT; 1649e9eec721SQu Wenruo unsigned int nr_pages = last_index - start_index + 1; 1650e9eec721SQu Wenruo int ret = 0; 1651e9eec721SQu Wenruo int i; 1652e9eec721SQu Wenruo 1653e9eec721SQu Wenruo ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); 1654e9eec721SQu Wenruo ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); 1655e9eec721SQu Wenruo 1656e9eec721SQu Wenruo pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); 1657e9eec721SQu Wenruo if (!pages) 1658e9eec721SQu Wenruo return -ENOMEM; 1659e9eec721SQu Wenruo 1660e9eec721SQu Wenruo /* Prepare all pages */ 1661e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1662e9eec721SQu Wenruo pages[i] = defrag_prepare_one_page(inode, start_index + i); 1663e9eec721SQu Wenruo if (IS_ERR(pages[i])) { 1664e9eec721SQu Wenruo ret = PTR_ERR(pages[i]); 1665e9eec721SQu Wenruo pages[i] = NULL; 1666e9eec721SQu Wenruo goto free_pages; 1667e9eec721SQu Wenruo } 1668e9eec721SQu Wenruo } 1669e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) 16704cb5300bSChris Mason wait_on_page_writeback(pages[i]); 16714cb5300bSChris Mason 1672e9eec721SQu Wenruo /* Lock the pages range */ 1673570eb97bSJosef Bacik lock_extent(&inode->io_tree, start_index << PAGE_SHIFT, 1674e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1675e9eec721SQu Wenruo &cached_state); 1676e9eec721SQu Wenruo /* 1677e9eec721SQu Wenruo * Now we have a consistent view about the extent map, re-check 1678e9eec721SQu Wenruo * which range really needs to be defragged. 1679e9eec721SQu Wenruo * 1680e9eec721SQu Wenruo * And this time we have extent locked already, pass @locked = true 1681e9eec721SQu Wenruo * so that we won't relock the extent range and cause deadlock. 1682e9eec721SQu Wenruo */ 1683e9eec721SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1684e9eec721SQu Wenruo newer_than, do_compress, true, 1685966d879bSQu Wenruo &target_list, last_scanned_ret); 1686e9eec721SQu Wenruo if (ret < 0) 1687e9eec721SQu Wenruo goto unlock_extent; 16884cb5300bSChris Mason 1689e9eec721SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1690e9eec721SQu Wenruo ret = defrag_one_locked_target(inode, entry, pages, nr_pages, 1691e9eec721SQu Wenruo &cached_state); 1692e9eec721SQu Wenruo if (ret < 0) 1693e9eec721SQu Wenruo break; 1694e9eec721SQu Wenruo } 1695e9eec721SQu Wenruo 1696e9eec721SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1697e9eec721SQu Wenruo list_del_init(&entry->list); 1698e9eec721SQu Wenruo kfree(entry); 1699e9eec721SQu Wenruo } 1700e9eec721SQu Wenruo unlock_extent: 1701570eb97bSJosef Bacik unlock_extent(&inode->io_tree, start_index << PAGE_SHIFT, 1702e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1703e9eec721SQu Wenruo &cached_state); 1704e9eec721SQu Wenruo free_pages: 1705e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1706e9eec721SQu Wenruo if (pages[i]) { 1707e9eec721SQu Wenruo unlock_page(pages[i]); 1708e9eec721SQu Wenruo put_page(pages[i]); 1709e9eec721SQu Wenruo } 1710e9eec721SQu Wenruo } 1711e9eec721SQu Wenruo kfree(pages); 1712e9eec721SQu Wenruo return ret; 1713e9eec721SQu Wenruo } 1714e9eec721SQu Wenruo 1715b18c3ab2SQu Wenruo static int defrag_one_cluster(struct btrfs_inode *inode, 1716b18c3ab2SQu Wenruo struct file_ra_state *ra, 1717b18c3ab2SQu Wenruo u64 start, u32 len, u32 extent_thresh, 1718b18c3ab2SQu Wenruo u64 newer_than, bool do_compress, 1719b18c3ab2SQu Wenruo unsigned long *sectors_defragged, 1720966d879bSQu Wenruo unsigned long max_sectors, 1721966d879bSQu Wenruo u64 *last_scanned_ret) 1722b18c3ab2SQu Wenruo { 1723b18c3ab2SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1724b18c3ab2SQu Wenruo struct defrag_target_range *entry; 1725b18c3ab2SQu Wenruo struct defrag_target_range *tmp; 1726b18c3ab2SQu Wenruo LIST_HEAD(target_list); 1727b18c3ab2SQu Wenruo int ret; 1728b18c3ab2SQu Wenruo 1729b18c3ab2SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1730b18c3ab2SQu Wenruo newer_than, do_compress, false, 1731966d879bSQu Wenruo &target_list, NULL); 1732b18c3ab2SQu Wenruo if (ret < 0) 1733b18c3ab2SQu Wenruo goto out; 1734b18c3ab2SQu Wenruo 1735b18c3ab2SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1736b18c3ab2SQu Wenruo u32 range_len = entry->len; 1737b18c3ab2SQu Wenruo 1738484167daSQu Wenruo /* Reached or beyond the limit */ 1739c080b414SQu Wenruo if (max_sectors && *sectors_defragged >= max_sectors) { 1740c080b414SQu Wenruo ret = 1; 1741b18c3ab2SQu Wenruo break; 1742c080b414SQu Wenruo } 1743b18c3ab2SQu Wenruo 1744b18c3ab2SQu Wenruo if (max_sectors) 1745b18c3ab2SQu Wenruo range_len = min_t(u32, range_len, 1746b18c3ab2SQu Wenruo (max_sectors - *sectors_defragged) * sectorsize); 1747b18c3ab2SQu Wenruo 1748966d879bSQu Wenruo /* 1749966d879bSQu Wenruo * If defrag_one_range() has updated last_scanned_ret, 1750966d879bSQu Wenruo * our range may already be invalid (e.g. hole punched). 1751966d879bSQu Wenruo * Skip if our range is before last_scanned_ret, as there is 1752966d879bSQu Wenruo * no need to defrag the range anymore. 1753966d879bSQu Wenruo */ 1754966d879bSQu Wenruo if (entry->start + range_len <= *last_scanned_ret) 1755966d879bSQu Wenruo continue; 1756966d879bSQu Wenruo 1757b18c3ab2SQu Wenruo if (ra) 1758b18c3ab2SQu Wenruo page_cache_sync_readahead(inode->vfs_inode.i_mapping, 1759b18c3ab2SQu Wenruo ra, NULL, entry->start >> PAGE_SHIFT, 1760b18c3ab2SQu Wenruo ((entry->start + range_len - 1) >> PAGE_SHIFT) - 1761b18c3ab2SQu Wenruo (entry->start >> PAGE_SHIFT) + 1); 1762b18c3ab2SQu Wenruo /* 1763b18c3ab2SQu Wenruo * Here we may not defrag any range if holes are punched before 1764b18c3ab2SQu Wenruo * we locked the pages. 1765b18c3ab2SQu Wenruo * But that's fine, it only affects the @sectors_defragged 1766b18c3ab2SQu Wenruo * accounting. 1767b18c3ab2SQu Wenruo */ 1768b18c3ab2SQu Wenruo ret = defrag_one_range(inode, entry->start, range_len, 1769966d879bSQu Wenruo extent_thresh, newer_than, do_compress, 1770966d879bSQu Wenruo last_scanned_ret); 1771b18c3ab2SQu Wenruo if (ret < 0) 1772b18c3ab2SQu Wenruo break; 1773484167daSQu Wenruo *sectors_defragged += range_len >> 1774484167daSQu Wenruo inode->root->fs_info->sectorsize_bits; 1775b18c3ab2SQu Wenruo } 1776b18c3ab2SQu Wenruo out: 1777b18c3ab2SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1778b18c3ab2SQu Wenruo list_del_init(&entry->list); 1779b18c3ab2SQu Wenruo kfree(entry); 1780b18c3ab2SQu Wenruo } 1781966d879bSQu Wenruo if (ret >= 0) 1782966d879bSQu Wenruo *last_scanned_ret = max(*last_scanned_ret, start + len); 1783b18c3ab2SQu Wenruo return ret; 1784b18c3ab2SQu Wenruo } 17857f458a38SFilipe Manana 17867f458a38SFilipe Manana /* 17871ccc2e8aSQu Wenruo * Entry point to file defragmentation. 17881ccc2e8aSQu Wenruo * 17891ccc2e8aSQu Wenruo * @inode: inode to be defragged 17901ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 17911ccc2e8aSQu Wenruo * @range: defrag options including range and flags 17921ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 17931ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 17941ccc2e8aSQu Wenruo * will be defragged. 1795484167daSQu Wenruo * 1796484167daSQu Wenruo * Return <0 for error. 1797c080b414SQu Wenruo * Return >=0 for the number of sectors defragged, and range->start will be updated 1798c080b414SQu Wenruo * to indicate the file offset where next defrag should be started at. 1799c080b414SQu Wenruo * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without 1800c080b414SQu Wenruo * defragging all the range). 18017f458a38SFilipe Manana */ 18021ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 18034cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 18044cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 18054cb5300bSChris Mason { 18060b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18077b508037SQu Wenruo unsigned long sectors_defragged = 0; 1808151a31b2SLi Zefan u64 isize = i_size_read(inode); 18097b508037SQu Wenruo u64 cur; 18107b508037SQu Wenruo u64 last_byte; 18111e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 18121ccc2e8aSQu Wenruo bool ra_allocated = false; 18137b508037SQu Wenruo int compress_type = BTRFS_COMPRESS_ZLIB; 18147b508037SQu Wenruo int ret = 0; 18157b508037SQu Wenruo u32 extent_thresh = range->extent_thresh; 181627cdfde1SFilipe Manana pgoff_t start_index; 18174cb5300bSChris Mason 18180abd5b17SLiu Bo if (isize == 0) 18190abd5b17SLiu Bo return 0; 18200abd5b17SLiu Bo 18210abd5b17SLiu Bo if (range->start >= isize) 18220abd5b17SLiu Bo return -EINVAL; 18231a419d85SLi Zefan 18241e2ef46dSDavid Sterba if (do_compress) { 1825ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 18261a419d85SLi Zefan return -EINVAL; 18271a419d85SLi Zefan if (range->compress_type) 18281a419d85SLi Zefan compress_type = range->compress_type; 18291a419d85SLi Zefan } 1830f46b5a66SChristoph Hellwig 18310abd5b17SLiu Bo if (extent_thresh == 0) 1832ee22184bSByongho Lee extent_thresh = SZ_256K; 1833f46b5a66SChristoph Hellwig 18347b508037SQu Wenruo if (range->start + range->len > range->start) { 18357b508037SQu Wenruo /* Got a specific range */ 18366b34cd8eSFilipe Manana last_byte = min(isize, range->start + range->len); 18377b508037SQu Wenruo } else { 18387b508037SQu Wenruo /* Defrag until file end */ 18396b34cd8eSFilipe Manana last_byte = isize; 18407b508037SQu Wenruo } 18417b508037SQu Wenruo 18426b34cd8eSFilipe Manana /* Align the range */ 18436b34cd8eSFilipe Manana cur = round_down(range->start, fs_info->sectorsize); 18446b34cd8eSFilipe Manana last_byte = round_up(last_byte, fs_info->sectorsize) - 1; 18456b34cd8eSFilipe Manana 18464cb5300bSChris Mason /* 18471ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 18480a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 18490a52d108SDavid Sterba * we don't error out. 18504cb5300bSChris Mason */ 18511ccc2e8aSQu Wenruo if (!ra) { 18521ccc2e8aSQu Wenruo ra_allocated = true; 185363e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 18540a52d108SDavid Sterba if (ra) 18554cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 18564cb5300bSChris Mason } 18574cb5300bSChris Mason 185827cdfde1SFilipe Manana /* 185927cdfde1SFilipe Manana * Make writeback start from the beginning of the range, so that the 186027cdfde1SFilipe Manana * defrag range can be written sequentially. 186127cdfde1SFilipe Manana */ 186227cdfde1SFilipe Manana start_index = cur >> PAGE_SHIFT; 186327cdfde1SFilipe Manana if (start_index < inode->i_mapping->writeback_index) 186427cdfde1SFilipe Manana inode->i_mapping->writeback_index = start_index; 186527cdfde1SFilipe Manana 18667b508037SQu Wenruo while (cur < last_byte) { 18673c9d31c7SFilipe Manana const unsigned long prev_sectors_defragged = sectors_defragged; 1868966d879bSQu Wenruo u64 last_scanned = cur; 18697b508037SQu Wenruo u64 cluster_end; 18701e701a32SChris Mason 1871b767c2fcSFilipe Manana if (btrfs_defrag_cancelled(fs_info)) { 1872b767c2fcSFilipe Manana ret = -EAGAIN; 1873b767c2fcSFilipe Manana break; 1874b767c2fcSFilipe Manana } 1875b767c2fcSFilipe Manana 18767b508037SQu Wenruo /* We want the cluster end at page boundary when possible */ 18777b508037SQu Wenruo cluster_end = (((cur >> PAGE_SHIFT) + 18787b508037SQu Wenruo (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; 18797b508037SQu Wenruo cluster_end = min(cluster_end, last_byte); 18804cb5300bSChris Mason 188164708539SJosef Bacik btrfs_inode_lock(inode, 0); 1882eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1883eede2bf3SOmar Sandoval ret = -ETXTBSY; 18847b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18857b508037SQu Wenruo break; 18867b508037SQu Wenruo } 18877b508037SQu Wenruo if (!(inode->i_sb->s_flags & SB_ACTIVE)) { 18887b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18897b508037SQu Wenruo break; 18907b508037SQu Wenruo } 18911e2ef46dSDavid Sterba if (do_compress) 1892eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 18937b508037SQu Wenruo ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, 18947b508037SQu Wenruo cluster_end + 1 - cur, extent_thresh, 1895966d879bSQu Wenruo newer_than, do_compress, §ors_defragged, 1896966d879bSQu Wenruo max_to_defrag, &last_scanned); 18973c9d31c7SFilipe Manana 18983c9d31c7SFilipe Manana if (sectors_defragged > prev_sectors_defragged) 18993c9d31c7SFilipe Manana balance_dirty_pages_ratelimited(inode->i_mapping); 19003c9d31c7SFilipe Manana 190164708539SJosef Bacik btrfs_inode_unlock(inode, 0); 19027b508037SQu Wenruo if (ret < 0) 19034cb5300bSChris Mason break; 1904966d879bSQu Wenruo cur = max(cluster_end + 1, last_scanned); 1905c080b414SQu Wenruo if (ret > 0) { 1906c080b414SQu Wenruo ret = 0; 1907c080b414SQu Wenruo break; 1908c080b414SQu Wenruo } 1909ea0eba69SQu Wenruo cond_resched(); 19104cb5300bSChris Mason } 1911f46b5a66SChristoph Hellwig 19127b508037SQu Wenruo if (ra_allocated) 19137b508037SQu Wenruo kfree(ra); 1914c080b414SQu Wenruo /* 1915c080b414SQu Wenruo * Update range.start for autodefrag, this will indicate where to start 1916c080b414SQu Wenruo * in next run. 1917c080b414SQu Wenruo */ 1918c080b414SQu Wenruo range->start = cur; 19197b508037SQu Wenruo if (sectors_defragged) { 19207b508037SQu Wenruo /* 19217b508037SQu Wenruo * We have defragged some sectors, for compression case they 19227b508037SQu Wenruo * need to be written back immediately. 19237b508037SQu Wenruo */ 19247b508037SQu Wenruo if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { 19251e701a32SChris Mason filemap_flush(inode->i_mapping); 1926dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1927dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1928dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1929dec8ef90SFilipe Manana } 19307b508037SQu Wenruo if (range->compress_type == BTRFS_COMPRESS_LZO) 19310b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 19327b508037SQu Wenruo else if (range->compress_type == BTRFS_COMPRESS_ZSTD) 19335c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 19347b508037SQu Wenruo ret = sectors_defragged; 19351a419d85SLi Zefan } 19361e2ef46dSDavid Sterba if (do_compress) { 193764708539SJosef Bacik btrfs_inode_lock(inode, 0); 1938eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 193964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1940633085c7SFilipe David Borba Manana } 1941940100a4SChris Mason return ret; 1942f46b5a66SChristoph Hellwig } 1943f46b5a66SChristoph Hellwig 194417aaa434SDavid Sterba /* 194517aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 194617aaa434SDavid Sterba * 194717aaa434SDavid Sterba * Return: 194817aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 194917aaa434SDavid Sterba * >0 - normal mode, something else is running, 195017aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 195117aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 195217aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 195317aaa434SDavid Sterba */ 195417aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 195517aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 195617aaa434SDavid Sterba { 195717aaa434SDavid Sterba if (!cancel) { 195817aaa434SDavid Sterba /* Start normal op */ 195917aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 196017aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 196117aaa434SDavid Sterba /* Exclusive operation is now claimed */ 196217aaa434SDavid Sterba return 0; 196317aaa434SDavid Sterba } 196417aaa434SDavid Sterba 196517aaa434SDavid Sterba /* Cancel running op */ 196617aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 196717aaa434SDavid Sterba /* 196817aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 196917aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 197017aaa434SDavid Sterba * or it has finished and no waiting will happen. 197117aaa434SDavid Sterba */ 197217aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 197317aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 197417aaa434SDavid Sterba 197517aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 197617aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 197717aaa434SDavid Sterba TASK_INTERRUPTIBLE); 197817aaa434SDavid Sterba 197917aaa434SDavid Sterba return -ECANCELED; 198017aaa434SDavid Sterba } 198117aaa434SDavid Sterba 198217aaa434SDavid Sterba /* Something else is running or none */ 198317aaa434SDavid Sterba return -ENOTCONN; 198417aaa434SDavid Sterba } 198517aaa434SDavid Sterba 1986198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 198776dda93cSYan, Zheng void __user *arg) 1988f46b5a66SChristoph Hellwig { 1989562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 19900b246afaSJeff Mahoney struct inode *inode = file_inode(file); 19910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1992f46b5a66SChristoph Hellwig u64 new_size; 1993f46b5a66SChristoph Hellwig u64 old_size; 1994f46b5a66SChristoph Hellwig u64 devid = 1; 19950b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1996f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1997f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1998f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1999f46b5a66SChristoph Hellwig char *sizestr; 20009a40f122SGui Hecheng char *retptr; 2001f46b5a66SChristoph Hellwig char *devstr = NULL; 2002f46b5a66SChristoph Hellwig int ret = 0; 2003f46b5a66SChristoph Hellwig int mod = 0; 2004bb059a37SDavid Sterba bool cancel; 2005f46b5a66SChristoph Hellwig 2006e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2007e441d54dSChris Mason return -EPERM; 2008e441d54dSChris Mason 2009198605a8SMiao Xie ret = mnt_want_write_file(file); 2010198605a8SMiao Xie if (ret) 2011198605a8SMiao Xie return ret; 2012198605a8SMiao Xie 2013bb059a37SDavid Sterba /* 2014bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 2015bb059a37SDavid Sterba * distinguish regular resize and cancel 2016bb059a37SDavid Sterba */ 2017dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2018c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2019c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2020bb059a37SDavid Sterba goto out_drop; 2021c9e9f97bSIlya Dryomov } 20225516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2023f46b5a66SChristoph Hellwig sizestr = vol_args->name; 2024bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 2025bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 2026bb059a37SDavid Sterba if (ret) 2027bb059a37SDavid Sterba goto out_free; 2028bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 2029bb059a37SDavid Sterba 2030f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 2031f46b5a66SChristoph Hellwig if (devstr) { 2032f46b5a66SChristoph Hellwig sizestr = devstr + 1; 2033f46b5a66SChristoph Hellwig *devstr = '\0'; 2034f46b5a66SChristoph Hellwig devstr = vol_args->name; 203558dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 203658dfae63SZhangZhen if (ret) 2037bb059a37SDavid Sterba goto out_finish; 2038dfd79829SMiao Xie if (!devid) { 2039dfd79829SMiao Xie ret = -EINVAL; 2040bb059a37SDavid Sterba goto out_finish; 2041dfd79829SMiao Xie } 20420b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 2043f46b5a66SChristoph Hellwig } 2044dba60f3fSMiao Xie 2045562d7b15SJosef Bacik args.devid = devid; 2046562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 2047f46b5a66SChristoph Hellwig if (!device) { 20480b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 2049c1c9ff7cSGeert Uytterhoeven devid); 2050dfd79829SMiao Xie ret = -ENODEV; 2051bb059a37SDavid Sterba goto out_finish; 2052f46b5a66SChristoph Hellwig } 2053dba60f3fSMiao Xie 2054ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 20550b246afaSJeff Mahoney btrfs_info(fs_info, 2056efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 2057c1c9ff7cSGeert Uytterhoeven devid); 2058dfd79829SMiao Xie ret = -EPERM; 2059bb059a37SDavid Sterba goto out_finish; 20604e42ae1bSLiu Bo } 20614e42ae1bSLiu Bo 2062f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 2063cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 2064f46b5a66SChristoph Hellwig else { 2065f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 2066f46b5a66SChristoph Hellwig mod = -1; 2067f46b5a66SChristoph Hellwig sizestr++; 2068f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 2069f46b5a66SChristoph Hellwig mod = 1; 2070f46b5a66SChristoph Hellwig sizestr++; 2071f46b5a66SChristoph Hellwig } 20729a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 20739a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 2074f46b5a66SChristoph Hellwig ret = -EINVAL; 2075bb059a37SDavid Sterba goto out_finish; 2076f46b5a66SChristoph Hellwig } 2077f46b5a66SChristoph Hellwig } 2078f46b5a66SChristoph Hellwig 2079401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 2080dfd79829SMiao Xie ret = -EPERM; 2081bb059a37SDavid Sterba goto out_finish; 208263a212abSStefan Behrens } 208363a212abSStefan Behrens 20847cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 2085f46b5a66SChristoph Hellwig 2086f46b5a66SChristoph Hellwig if (mod < 0) { 2087f46b5a66SChristoph Hellwig if (new_size > old_size) { 2088f46b5a66SChristoph Hellwig ret = -EINVAL; 2089bb059a37SDavid Sterba goto out_finish; 2090f46b5a66SChristoph Hellwig } 2091f46b5a66SChristoph Hellwig new_size = old_size - new_size; 2092f46b5a66SChristoph Hellwig } else if (mod > 0) { 2093eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 2094902c68a4SGui Hecheng ret = -ERANGE; 2095bb059a37SDavid Sterba goto out_finish; 2096eb8052e0SWenliang Fan } 2097f46b5a66SChristoph Hellwig new_size = old_size + new_size; 2098f46b5a66SChristoph Hellwig } 2099f46b5a66SChristoph Hellwig 2100ee22184bSByongho Lee if (new_size < SZ_256M) { 2101f46b5a66SChristoph Hellwig ret = -EINVAL; 2102bb059a37SDavid Sterba goto out_finish; 2103f46b5a66SChristoph Hellwig } 2104cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 2105f46b5a66SChristoph Hellwig ret = -EFBIG; 2106bb059a37SDavid Sterba goto out_finish; 2107f46b5a66SChristoph Hellwig } 2108f46b5a66SChristoph Hellwig 210947f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 2110f46b5a66SChristoph Hellwig 2111f46b5a66SChristoph Hellwig if (new_size > old_size) { 2112a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 211398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 211498d5dc13STsutomu Itoh ret = PTR_ERR(trans); 2115bb059a37SDavid Sterba goto out_finish; 211698d5dc13STsutomu Itoh } 2117f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 21183a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 2119ece7d20eSMike Fleetwood } else if (new_size < old_size) { 2120f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 21210253f40eSjeff.liu } /* equal, nothing need to do */ 2122f46b5a66SChristoph Hellwig 2123faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 2124faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 2125faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 2126faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 2127faf8f7b9SMarcos Paulo de Souza old_size, new_size); 2128bb059a37SDavid Sterba out_finish: 2129bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 2130c9e9f97bSIlya Dryomov out_free: 2131f46b5a66SChristoph Hellwig kfree(vol_args); 2132bb059a37SDavid Sterba out_drop: 213318f39c41SIlya Dryomov mnt_drop_write_file(file); 2134f46b5a66SChristoph Hellwig return ret; 2135f46b5a66SChristoph Hellwig } 2136f46b5a66SChristoph Hellwig 21375d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 21384d4340c9SChristian Brauner struct user_namespace *mnt_userns, 213952f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 21405d54c67eSNikolay Borisov bool readonly, 21418696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 2142f46b5a66SChristoph Hellwig { 2143f46b5a66SChristoph Hellwig int namelen; 21443de4586cSChris Mason int ret = 0; 2145f46b5a66SChristoph Hellwig 2146325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2147325c50e3SJeff Mahoney return -ENOTDIR; 2148325c50e3SJeff Mahoney 2149a874a63eSLiu Bo ret = mnt_want_write_file(file); 2150a874a63eSLiu Bo if (ret) 2151a874a63eSLiu Bo goto out; 2152a874a63eSLiu Bo 215372fd032eSSage Weil namelen = strlen(name); 215472fd032eSSage Weil if (strchr(name, '/')) { 2155f46b5a66SChristoph Hellwig ret = -EINVAL; 2156a874a63eSLiu Bo goto out_drop_write; 2157f46b5a66SChristoph Hellwig } 2158f46b5a66SChristoph Hellwig 215916780cabSChris Mason if (name[0] == '.' && 216016780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 216116780cabSChris Mason ret = -EEXIST; 2162a874a63eSLiu Bo goto out_drop_write; 216316780cabSChris Mason } 216416780cabSChris Mason 21653de4586cSChris Mason if (subvol) { 21664d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 21674d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 2168cb8e7090SChristoph Hellwig } else { 21692903ff01SAl Viro struct fd src = fdget(fd); 21703de4586cSChris Mason struct inode *src_inode; 21712903ff01SAl Viro if (!src.file) { 21723de4586cSChris Mason ret = -EINVAL; 2173a874a63eSLiu Bo goto out_drop_write; 21743de4586cSChris Mason } 21753de4586cSChris Mason 2176496ad9aaSAl Viro src_inode = file_inode(src.file); 2177496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2178c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2179efe120a0SFrank Holton "Snapshot src from another FS"); 218023ad5b17SKusanagi Kouichi ret = -EXDEV; 21814d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2182d0242061SDavid Sterba /* 2183d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2184d0242061SDavid Sterba * are limited to own subvolumes only 2185d0242061SDavid Sterba */ 2186d0242061SDavid Sterba ret = -EPERM; 2187ecd18815SAl Viro } else { 21884d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 21894d4340c9SChristian Brauner name, namelen, 219072fd032eSSage Weil BTRFS_I(src_inode)->root, 21915d54c67eSNikolay Borisov readonly, inherit); 2192ecd18815SAl Viro } 21932903ff01SAl Viro fdput(src); 2194cb8e7090SChristoph Hellwig } 2195a874a63eSLiu Bo out_drop_write: 2196a874a63eSLiu Bo mnt_drop_write_file(file); 2197f46b5a66SChristoph Hellwig out: 219872fd032eSSage Weil return ret; 219972fd032eSSage Weil } 220072fd032eSSage Weil 220172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2202fa0d2b9bSLi Zefan void __user *arg, int subvol) 220372fd032eSSage Weil { 2204fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 220572fd032eSSage Weil int ret; 220672fd032eSSage Weil 2207325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2208325c50e3SJeff Mahoney return -ENOTDIR; 2209325c50e3SJeff Mahoney 2210fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2211fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2212fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2213fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2214fa0d2b9bSLi Zefan 22154d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22164d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22174d4340c9SChristian Brauner false, NULL); 2218fa0d2b9bSLi Zefan 2219fa0d2b9bSLi Zefan kfree(vol_args); 2220fa0d2b9bSLi Zefan return ret; 2221fa0d2b9bSLi Zefan } 2222fa0d2b9bSLi Zefan 2223fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2224fa0d2b9bSLi Zefan void __user *arg, int subvol) 2225fa0d2b9bSLi Zefan { 2226fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2227fa0d2b9bSLi Zefan int ret; 2228b83cc969SLi Zefan bool readonly = false; 22296f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 223072fd032eSSage Weil 2231325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2232325c50e3SJeff Mahoney return -ENOTDIR; 2233325c50e3SJeff Mahoney 2234fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2235fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2236fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2237fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2238fdfb1e4fSLi Zefan 2239673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2240b83cc969SLi Zefan ret = -EOPNOTSUPP; 2241c47ca32dSDan Carpenter goto free_args; 2242fdfb1e4fSLi Zefan } 2243fdfb1e4fSLi Zefan 2244b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2245b83cc969SLi Zefan readonly = true; 22466f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 22475011c5a6SDan Carpenter u64 nums; 22485011c5a6SDan Carpenter 22495011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 22505011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 22516f72c7e2SArne Jansen ret = -EINVAL; 2252c47ca32dSDan Carpenter goto free_args; 22536f72c7e2SArne Jansen } 22546f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 22556f72c7e2SArne Jansen if (IS_ERR(inherit)) { 22566f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2257c47ca32dSDan Carpenter goto free_args; 22586f72c7e2SArne Jansen } 22595011c5a6SDan Carpenter 22605011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 22615011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 22625011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 22635011c5a6SDan Carpenter ret = -EINVAL; 22645011c5a6SDan Carpenter goto free_inherit; 22655011c5a6SDan Carpenter } 22665011c5a6SDan Carpenter 22675011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 22685011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 22695011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 22705011c5a6SDan Carpenter ret = -EINVAL; 22715011c5a6SDan Carpenter goto free_inherit; 22725011c5a6SDan Carpenter } 22736f72c7e2SArne Jansen } 227475eaa0e2SSage Weil 22754d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22764d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22774d4340c9SChristian Brauner readonly, inherit); 2278c47ca32dSDan Carpenter if (ret) 2279c47ca32dSDan Carpenter goto free_inherit; 2280c47ca32dSDan Carpenter free_inherit: 22816f72c7e2SArne Jansen kfree(inherit); 2282c47ca32dSDan Carpenter free_args: 2283c47ca32dSDan Carpenter kfree(vol_args); 2284f46b5a66SChristoph Hellwig return ret; 2285f46b5a66SChristoph Hellwig } 2286f46b5a66SChristoph Hellwig 22879ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 22880caa102dSLi Zefan void __user *arg) 22890caa102dSLi Zefan { 22900b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 22910caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 22920caa102dSLi Zefan int ret = 0; 22930caa102dSLi Zefan u64 flags = 0; 22940caa102dSLi Zefan 22954a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 22960caa102dSLi Zefan return -EINVAL; 22970caa102dSLi Zefan 22980b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 22990caa102dSLi Zefan if (btrfs_root_readonly(root)) 23000caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 23010b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 23020caa102dSLi Zefan 23030caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 23040caa102dSLi Zefan ret = -EFAULT; 23050caa102dSLi Zefan 23060caa102dSLi Zefan return ret; 23070caa102dSLi Zefan } 23080caa102dSLi Zefan 23090caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 23100caa102dSLi Zefan void __user *arg) 23110caa102dSLi Zefan { 2312496ad9aaSAl Viro struct inode *inode = file_inode(file); 23130b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 23140caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 23150caa102dSLi Zefan struct btrfs_trans_handle *trans; 23160caa102dSLi Zefan u64 root_flags; 23170caa102dSLi Zefan u64 flags; 23180caa102dSLi Zefan int ret = 0; 23190caa102dSLi Zefan 232039e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2321bd60ea0fSDavid Sterba return -EPERM; 2322bd60ea0fSDavid Sterba 2323b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2324b9ca0664SLiu Bo if (ret) 2325b9ca0664SLiu Bo goto out; 23260caa102dSLi Zefan 23274a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2328b9ca0664SLiu Bo ret = -EINVAL; 2329b9ca0664SLiu Bo goto out_drop_write; 2330b9ca0664SLiu Bo } 23310caa102dSLi Zefan 2332b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2333b9ca0664SLiu Bo ret = -EFAULT; 2334b9ca0664SLiu Bo goto out_drop_write; 2335b9ca0664SLiu Bo } 23360caa102dSLi Zefan 2337b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2338b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2339b9ca0664SLiu Bo goto out_drop_write; 2340b9ca0664SLiu Bo } 23410caa102dSLi Zefan 23420b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 23430caa102dSLi Zefan 23440caa102dSLi Zefan /* nothing to do */ 23450caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2346b9ca0664SLiu Bo goto out_drop_sem; 23470caa102dSLi Zefan 23480caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 23492c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 23500caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23510caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 23522c686537SDavid Sterba } else { 23532c686537SDavid Sterba /* 23542c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 23552c686537SDavid Sterba * send 23562c686537SDavid Sterba */ 23572c686537SDavid Sterba spin_lock(&root->root_item_lock); 23582c686537SDavid Sterba if (root->send_in_progress == 0) { 23590caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23600caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 23612c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23622c686537SDavid Sterba } else { 23632c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23640b246afaSJeff Mahoney btrfs_warn(fs_info, 23652c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 23662c686537SDavid Sterba root->root_key.objectid); 23672c686537SDavid Sterba ret = -EPERM; 23682c686537SDavid Sterba goto out_drop_sem; 23692c686537SDavid Sterba } 23702c686537SDavid Sterba } 23710caa102dSLi Zefan 23720caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 23730caa102dSLi Zefan if (IS_ERR(trans)) { 23740caa102dSLi Zefan ret = PTR_ERR(trans); 23750caa102dSLi Zefan goto out_reset; 23760caa102dSLi Zefan } 23770caa102dSLi Zefan 23780b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 23790caa102dSLi Zefan &root->root_key, &root->root_item); 23809417ebc8SNikolay Borisov if (ret < 0) { 23819417ebc8SNikolay Borisov btrfs_end_transaction(trans); 23829417ebc8SNikolay Borisov goto out_reset; 23839417ebc8SNikolay Borisov } 23840caa102dSLi Zefan 23859417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 23869417ebc8SNikolay Borisov 23870caa102dSLi Zefan out_reset: 23880caa102dSLi Zefan if (ret) 23890caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2390b9ca0664SLiu Bo out_drop_sem: 23910b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2392b9ca0664SLiu Bo out_drop_write: 2393b9ca0664SLiu Bo mnt_drop_write_file(file); 2394b9ca0664SLiu Bo out: 23950caa102dSLi Zefan return ret; 23960caa102dSLi Zefan } 23970caa102dSLi Zefan 2398ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2399ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2400ac8e9819SChris Mason { 2401abc6e134SChris Mason struct btrfs_key test; 2402abc6e134SChris Mason int ret; 2403abc6e134SChris Mason 2404abc6e134SChris Mason test.objectid = sk->min_objectid; 2405abc6e134SChris Mason test.type = sk->min_type; 2406abc6e134SChris Mason test.offset = sk->min_offset; 2407abc6e134SChris Mason 2408abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2409abc6e134SChris Mason if (ret < 0) 2410ac8e9819SChris Mason return 0; 2411abc6e134SChris Mason 2412abc6e134SChris Mason test.objectid = sk->max_objectid; 2413abc6e134SChris Mason test.type = sk->max_type; 2414abc6e134SChris Mason test.offset = sk->max_offset; 2415abc6e134SChris Mason 2416abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2417abc6e134SChris Mason if (ret > 0) 2418ac8e9819SChris Mason return 0; 2419ac8e9819SChris Mason return 1; 2420ac8e9819SChris Mason } 2421ac8e9819SChris Mason 2422df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2423ac8e9819SChris Mason struct btrfs_key *key, 2424ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 24259b6e817dSGerhard Heift size_t *buf_size, 2426ba346b35SGerhard Heift char __user *ubuf, 2427ac8e9819SChris Mason unsigned long *sk_offset, 2428ac8e9819SChris Mason int *num_found) 2429ac8e9819SChris Mason { 2430ac8e9819SChris Mason u64 found_transid; 2431ac8e9819SChris Mason struct extent_buffer *leaf; 2432ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2433dd81d459SNaohiro Aota struct btrfs_key test; 2434ac8e9819SChris Mason unsigned long item_off; 2435ac8e9819SChris Mason unsigned long item_len; 2436ac8e9819SChris Mason int nritems; 2437ac8e9819SChris Mason int i; 2438ac8e9819SChris Mason int slot; 2439ac8e9819SChris Mason int ret = 0; 2440ac8e9819SChris Mason 2441ac8e9819SChris Mason leaf = path->nodes[0]; 2442ac8e9819SChris Mason slot = path->slots[0]; 2443ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2444ac8e9819SChris Mason 2445ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2446ac8e9819SChris Mason i = nritems; 2447ac8e9819SChris Mason goto advance_key; 2448ac8e9819SChris Mason } 2449ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2450ac8e9819SChris Mason 2451ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2452ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 24533212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 2454ac8e9819SChris Mason 245503b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 245603b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 245703b71c6cSGabriel de Perthuis continue; 245803b71c6cSGabriel de Perthuis 24599b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 24608f5f6178SGerhard Heift if (*num_found) { 2461ac8e9819SChris Mason ret = 1; 24628f5f6178SGerhard Heift goto out; 24638f5f6178SGerhard Heift } 24648f5f6178SGerhard Heift 24658f5f6178SGerhard Heift /* 24668f5f6178SGerhard Heift * return one empty item back for v1, which does not 24678f5f6178SGerhard Heift * handle -EOVERFLOW 24688f5f6178SGerhard Heift */ 24698f5f6178SGerhard Heift 24709b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2471ac8e9819SChris Mason item_len = 0; 24728f5f6178SGerhard Heift ret = -EOVERFLOW; 24738f5f6178SGerhard Heift } 2474ac8e9819SChris Mason 24759b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2476ac8e9819SChris Mason ret = 1; 247725c9bc2eSGerhard Heift goto out; 2478ac8e9819SChris Mason } 2479ac8e9819SChris Mason 2480ac8e9819SChris Mason sh.objectid = key->objectid; 2481ac8e9819SChris Mason sh.offset = key->offset; 2482ac8e9819SChris Mason sh.type = key->type; 2483ac8e9819SChris Mason sh.len = item_len; 2484ac8e9819SChris Mason sh.transid = found_transid; 2485ac8e9819SChris Mason 2486a48b73ecSJosef Bacik /* 2487a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2488a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2489a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2490a48b73ecSJosef Bacik * properly this next time through 2491a48b73ecSJosef Bacik */ 2492a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2493a48b73ecSJosef Bacik ret = 0; 2494ba346b35SGerhard Heift goto out; 2495ba346b35SGerhard Heift } 2496ba346b35SGerhard Heift 2497ac8e9819SChris Mason *sk_offset += sizeof(sh); 2498ac8e9819SChris Mason 2499ac8e9819SChris Mason if (item_len) { 2500ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2501a48b73ecSJosef Bacik /* 2502a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2503a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2504a48b73ecSJosef Bacik */ 2505a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2506ba346b35SGerhard Heift item_off, item_len)) { 2507a48b73ecSJosef Bacik ret = 0; 2508a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2509ba346b35SGerhard Heift goto out; 2510ba346b35SGerhard Heift } 2511ba346b35SGerhard Heift 2512ac8e9819SChris Mason *sk_offset += item_len; 2513ac8e9819SChris Mason } 2514e2156867SHugo Mills (*num_found)++; 2515ac8e9819SChris Mason 25168f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 25178f5f6178SGerhard Heift goto out; 25188f5f6178SGerhard Heift 251925c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 252025c9bc2eSGerhard Heift ret = 1; 252125c9bc2eSGerhard Heift goto out; 252225c9bc2eSGerhard Heift } 2523ac8e9819SChris Mason } 2524ac8e9819SChris Mason advance_key: 2525ac8e9819SChris Mason ret = 0; 2526dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2527dd81d459SNaohiro Aota test.type = sk->max_type; 2528dd81d459SNaohiro Aota test.offset = sk->max_offset; 2529dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2530dd81d459SNaohiro Aota ret = 1; 2531dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2532abc6e134SChris Mason key->offset++; 2533dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2534abc6e134SChris Mason key->offset = 0; 2535abc6e134SChris Mason key->type++; 2536dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2537abc6e134SChris Mason key->offset = 0; 2538abc6e134SChris Mason key->type = 0; 2539abc6e134SChris Mason key->objectid++; 2540abc6e134SChris Mason } else 2541abc6e134SChris Mason ret = 1; 254225c9bc2eSGerhard Heift out: 2543ba346b35SGerhard Heift /* 2544ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2545ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2546ba346b35SGerhard Heift * * all items were found 2547ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2548ba346b35SGerhard Heift * leaf 2549ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2550ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2551ba346b35SGerhard Heift */ 2552ac8e9819SChris Mason return ret; 2553ac8e9819SChris Mason } 2554ac8e9819SChris Mason 2555ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 255612544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 25579b6e817dSGerhard Heift size_t *buf_size, 2558ba346b35SGerhard Heift char __user *ubuf) 2559ac8e9819SChris Mason { 25600b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2561ac8e9819SChris Mason struct btrfs_root *root; 2562ac8e9819SChris Mason struct btrfs_key key; 2563ac8e9819SChris Mason struct btrfs_path *path; 2564ac8e9819SChris Mason int ret; 2565ac8e9819SChris Mason int num_found = 0; 2566ac8e9819SChris Mason unsigned long sk_offset = 0; 2567ac8e9819SChris Mason 25689b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 25699b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 257012544442SGerhard Heift return -EOVERFLOW; 25719b6e817dSGerhard Heift } 257212544442SGerhard Heift 2573ac8e9819SChris Mason path = btrfs_alloc_path(); 2574ac8e9819SChris Mason if (!path) 2575ac8e9819SChris Mason return -ENOMEM; 2576ac8e9819SChris Mason 2577ac8e9819SChris Mason if (sk->tree_id == 0) { 2578ac8e9819SChris Mason /* search the root of the inode that was passed */ 257900246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2580ac8e9819SChris Mason } else { 258156e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2582ac8e9819SChris Mason if (IS_ERR(root)) { 2583ac8e9819SChris Mason btrfs_free_path(path); 2584ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2585ac8e9819SChris Mason } 2586ac8e9819SChris Mason } 2587ac8e9819SChris Mason 2588ac8e9819SChris Mason key.objectid = sk->min_objectid; 2589ac8e9819SChris Mason key.type = sk->min_type; 2590ac8e9819SChris Mason key.offset = sk->min_offset; 2591ac8e9819SChris Mason 2592ac8e9819SChris Mason while (1) { 2593bb523b40SAndreas Gruenbacher ret = -EFAULT; 259418788e34SCatalin Marinas /* 259518788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 259618788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 259718788e34SCatalin Marinas */ 259818788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 259918788e34SCatalin Marinas *buf_size - sk_offset)) 2600a48b73ecSJosef Bacik break; 2601a48b73ecSJosef Bacik 26026174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2603ac8e9819SChris Mason if (ret != 0) { 2604ac8e9819SChris Mason if (ret > 0) 2605ac8e9819SChris Mason ret = 0; 2606ac8e9819SChris Mason goto err; 2607ac8e9819SChris Mason } 2608df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2609ac8e9819SChris Mason &sk_offset, &num_found); 2610b3b4aa74SDavid Sterba btrfs_release_path(path); 261125c9bc2eSGerhard Heift if (ret) 2612ac8e9819SChris Mason break; 2613ac8e9819SChris Mason 2614ac8e9819SChris Mason } 26158f5f6178SGerhard Heift if (ret > 0) 2616ac8e9819SChris Mason ret = 0; 2617ac8e9819SChris Mason err: 2618ac8e9819SChris Mason sk->nr_items = num_found; 261900246528SJosef Bacik btrfs_put_root(root); 2620ac8e9819SChris Mason btrfs_free_path(path); 2621ac8e9819SChris Mason return ret; 2622ac8e9819SChris Mason } 2623ac8e9819SChris Mason 26249ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 2625ac8e9819SChris Mason void __user *argp) 2626ac8e9819SChris Mason { 26270d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 2628ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2629ac8e9819SChris Mason int ret; 26309b6e817dSGerhard Heift size_t buf_size; 2631ac8e9819SChris Mason 2632ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2633ac8e9819SChris Mason return -EPERM; 2634ac8e9819SChris Mason 2635ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2636ba346b35SGerhard Heift return -EFAULT; 2637ba346b35SGerhard Heift 2638ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2639ac8e9819SChris Mason 2640ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 26418f5f6178SGerhard Heift 26428f5f6178SGerhard Heift /* 26438f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 26448f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 26458f5f6178SGerhard Heift */ 26468f5f6178SGerhard Heift if (ret == -EOVERFLOW) 26478f5f6178SGerhard Heift ret = 0; 26488f5f6178SGerhard Heift 2649ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2650ac8e9819SChris Mason ret = -EFAULT; 2651ac8e9819SChris Mason return ret; 2652ac8e9819SChris Mason } 2653ac8e9819SChris Mason 26549ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 2655cc68a8a5SGerhard Heift void __user *argp) 2656cc68a8a5SGerhard Heift { 26570d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 2658cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2659cc68a8a5SGerhard Heift int ret; 2660cc68a8a5SGerhard Heift size_t buf_size; 2661ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2662cc68a8a5SGerhard Heift 2663cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2664cc68a8a5SGerhard Heift return -EPERM; 2665cc68a8a5SGerhard Heift 2666cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2667cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2668cc68a8a5SGerhard Heift return -EFAULT; 2669cc68a8a5SGerhard Heift 2670cc68a8a5SGerhard Heift buf_size = args.buf_size; 2671cc68a8a5SGerhard Heift 2672cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2673cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2674cc68a8a5SGerhard Heift buf_size = buf_limit; 2675cc68a8a5SGerhard Heift 2676cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2677718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2678cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2679cc68a8a5SGerhard Heift ret = -EFAULT; 2680cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2681cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2682cc68a8a5SGerhard Heift ret = -EFAULT; 2683cc68a8a5SGerhard Heift 268476dda93cSYan, Zheng return ret; 268576dda93cSYan, Zheng } 268676dda93cSYan, Zheng 268798d377a0STARUISI Hiroaki /* 2688ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2689ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 269098d377a0STARUISI Hiroaki */ 269198d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 269298d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 269398d377a0STARUISI Hiroaki { 269498d377a0STARUISI Hiroaki struct btrfs_root *root; 269598d377a0STARUISI Hiroaki struct btrfs_key key; 2696ac8e9819SChris Mason char *ptr; 269798d377a0STARUISI Hiroaki int ret = -1; 269898d377a0STARUISI Hiroaki int slot; 269998d377a0STARUISI Hiroaki int len; 270098d377a0STARUISI Hiroaki int total_len = 0; 270198d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 270298d377a0STARUISI Hiroaki struct extent_buffer *l; 270398d377a0STARUISI Hiroaki struct btrfs_path *path; 270498d377a0STARUISI Hiroaki 270598d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 270698d377a0STARUISI Hiroaki name[0]='\0'; 270798d377a0STARUISI Hiroaki return 0; 270898d377a0STARUISI Hiroaki } 270998d377a0STARUISI Hiroaki 271098d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 271198d377a0STARUISI Hiroaki if (!path) 271298d377a0STARUISI Hiroaki return -ENOMEM; 271398d377a0STARUISI Hiroaki 2714c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 271598d377a0STARUISI Hiroaki 271656e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 271798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2718ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 271988234012SJosef Bacik root = NULL; 272088234012SJosef Bacik goto out; 272188234012SJosef Bacik } 272298d377a0STARUISI Hiroaki 272398d377a0STARUISI Hiroaki key.objectid = dirid; 272498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 27258ad6fcabSChris Mason key.offset = (u64)-1; 272698d377a0STARUISI Hiroaki 272798d377a0STARUISI Hiroaki while (1) { 27280ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 272918674c6cSFilipe David Borba Manana if (ret < 0) 273018674c6cSFilipe David Borba Manana goto out; 273118674c6cSFilipe David Borba Manana else if (ret > 0) { 2732ac8e9819SChris Mason ret = -ENOENT; 273398d377a0STARUISI Hiroaki goto out; 2734ac8e9819SChris Mason } 273518674c6cSFilipe David Borba Manana 273618674c6cSFilipe David Borba Manana l = path->nodes[0]; 273718674c6cSFilipe David Borba Manana slot = path->slots[0]; 273898d377a0STARUISI Hiroaki 273998d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 274098d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 274198d377a0STARUISI Hiroaki ptr -= len + 1; 274298d377a0STARUISI Hiroaki total_len += len + 1; 2743a696cf35SFilipe David Borba Manana if (ptr < name) { 2744a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 274598d377a0STARUISI Hiroaki goto out; 2746a696cf35SFilipe David Borba Manana } 274798d377a0STARUISI Hiroaki 274898d377a0STARUISI Hiroaki *(ptr + len) = '/'; 274998d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 275098d377a0STARUISI Hiroaki 275198d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 275298d377a0STARUISI Hiroaki break; 275398d377a0STARUISI Hiroaki 2754b3b4aa74SDavid Sterba btrfs_release_path(path); 275598d377a0STARUISI Hiroaki key.objectid = key.offset; 27568ad6fcabSChris Mason key.offset = (u64)-1; 275798d377a0STARUISI Hiroaki dirid = key.objectid; 275898d377a0STARUISI Hiroaki } 275977906a50SLi Zefan memmove(name, ptr, total_len); 276098d377a0STARUISI Hiroaki name[total_len] = '\0'; 276198d377a0STARUISI Hiroaki ret = 0; 276298d377a0STARUISI Hiroaki out: 276300246528SJosef Bacik btrfs_put_root(root); 276498d377a0STARUISI Hiroaki btrfs_free_path(path); 2765ac8e9819SChris Mason return ret; 2766ac8e9819SChris Mason } 2767ac8e9819SChris Mason 27686623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 27696623d9a0SChristian Brauner struct inode *inode, 277023d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 277123d0b79dSTomohiro Misono { 277223d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 277323d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 277423d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 277523d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 277623d0b79dSTomohiro Misono u64 dirid = args->dirid; 277723d0b79dSTomohiro Misono unsigned long item_off; 277823d0b79dSTomohiro Misono unsigned long item_len; 277923d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 278023d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2781b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 278223d0b79dSTomohiro Misono struct btrfs_path *path; 278323d0b79dSTomohiro Misono struct btrfs_key key, key2; 278423d0b79dSTomohiro Misono struct extent_buffer *leaf; 278523d0b79dSTomohiro Misono struct inode *temp_inode; 278623d0b79dSTomohiro Misono char *ptr; 278723d0b79dSTomohiro Misono int slot; 278823d0b79dSTomohiro Misono int len; 278923d0b79dSTomohiro Misono int total_len = 0; 279023d0b79dSTomohiro Misono int ret; 279123d0b79dSTomohiro Misono 279223d0b79dSTomohiro Misono path = btrfs_alloc_path(); 279323d0b79dSTomohiro Misono if (!path) 279423d0b79dSTomohiro Misono return -ENOMEM; 279523d0b79dSTomohiro Misono 279623d0b79dSTomohiro Misono /* 279723d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 279823d0b79dSTomohiro Misono * construct the path in from the bottom up. 279923d0b79dSTomohiro Misono */ 280023d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 280123d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 280223d0b79dSTomohiro Misono 280356e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 280423d0b79dSTomohiro Misono if (IS_ERR(root)) { 280523d0b79dSTomohiro Misono ret = PTR_ERR(root); 280623d0b79dSTomohiro Misono goto out; 280723d0b79dSTomohiro Misono } 280823d0b79dSTomohiro Misono 280923d0b79dSTomohiro Misono key.objectid = dirid; 281023d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 281123d0b79dSTomohiro Misono key.offset = (u64)-1; 281223d0b79dSTomohiro Misono while (1) { 28130ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 28140ff40a91SMarcos Paulo de Souza if (ret < 0) 2815b8a49ae1SJosef Bacik goto out_put; 28160ff40a91SMarcos Paulo de Souza else if (ret > 0) { 281723d0b79dSTomohiro Misono ret = -ENOENT; 2818b8a49ae1SJosef Bacik goto out_put; 281923d0b79dSTomohiro Misono } 282023d0b79dSTomohiro Misono 282123d0b79dSTomohiro Misono leaf = path->nodes[0]; 282223d0b79dSTomohiro Misono slot = path->slots[0]; 282323d0b79dSTomohiro Misono 282423d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 282523d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 282623d0b79dSTomohiro Misono ptr -= len + 1; 282723d0b79dSTomohiro Misono total_len += len + 1; 282823d0b79dSTomohiro Misono if (ptr < args->path) { 282923d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2830b8a49ae1SJosef Bacik goto out_put; 283123d0b79dSTomohiro Misono } 283223d0b79dSTomohiro Misono 283323d0b79dSTomohiro Misono *(ptr + len) = '/'; 283423d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 283523d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 283623d0b79dSTomohiro Misono 283723d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 283823d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 283923d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 284023d0b79dSTomohiro Misono if (ret < 0) { 2841b8a49ae1SJosef Bacik goto out_put; 284223d0b79dSTomohiro Misono } else if (ret > 0) { 284323d0b79dSTomohiro Misono ret = -ENOENT; 2844b8a49ae1SJosef Bacik goto out_put; 284523d0b79dSTomohiro Misono } 284623d0b79dSTomohiro Misono 284723d0b79dSTomohiro Misono leaf = path->nodes[0]; 284823d0b79dSTomohiro Misono slot = path->slots[0]; 284923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 285023d0b79dSTomohiro Misono if (key2.objectid != dirid) { 285123d0b79dSTomohiro Misono ret = -ENOENT; 2852b8a49ae1SJosef Bacik goto out_put; 285323d0b79dSTomohiro Misono } 285423d0b79dSTomohiro Misono 28550202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 28563ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 28573ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2858b8a49ae1SJosef Bacik goto out_put; 28593ca57bd6SMisono Tomohiro } 28606623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 286147291baaSChristian Brauner MAY_READ | MAY_EXEC); 286223d0b79dSTomohiro Misono iput(temp_inode); 286323d0b79dSTomohiro Misono if (ret) { 286423d0b79dSTomohiro Misono ret = -EACCES; 2865b8a49ae1SJosef Bacik goto out_put; 286623d0b79dSTomohiro Misono } 286723d0b79dSTomohiro Misono 286823d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 286923d0b79dSTomohiro Misono break; 287023d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 287123d0b79dSTomohiro Misono ret = -EACCES; 2872b8a49ae1SJosef Bacik goto out_put; 287323d0b79dSTomohiro Misono } 287423d0b79dSTomohiro Misono 287523d0b79dSTomohiro Misono btrfs_release_path(path); 287623d0b79dSTomohiro Misono key.objectid = key.offset; 287723d0b79dSTomohiro Misono key.offset = (u64)-1; 287823d0b79dSTomohiro Misono dirid = key.objectid; 287923d0b79dSTomohiro Misono } 288023d0b79dSTomohiro Misono 288123d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 288223d0b79dSTomohiro Misono args->path[total_len] = '\0'; 288300246528SJosef Bacik btrfs_put_root(root); 2884b8a49ae1SJosef Bacik root = NULL; 288523d0b79dSTomohiro Misono btrfs_release_path(path); 288623d0b79dSTomohiro Misono } 288723d0b79dSTomohiro Misono 288823d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 288923d0b79dSTomohiro Misono key.objectid = treeid; 289023d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 289123d0b79dSTomohiro Misono key.offset = args->treeid; 2892b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 289323d0b79dSTomohiro Misono if (ret < 0) { 289423d0b79dSTomohiro Misono goto out; 289523d0b79dSTomohiro Misono } else if (ret > 0) { 289623d0b79dSTomohiro Misono ret = -ENOENT; 289723d0b79dSTomohiro Misono goto out; 289823d0b79dSTomohiro Misono } 289923d0b79dSTomohiro Misono 290023d0b79dSTomohiro Misono leaf = path->nodes[0]; 290123d0b79dSTomohiro Misono slot = path->slots[0]; 290223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 290323d0b79dSTomohiro Misono 290423d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 29053212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 290623d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 290723d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 290823d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 290923d0b79dSTomohiro Misono ret = -EINVAL; 291023d0b79dSTomohiro Misono goto out; 291123d0b79dSTomohiro Misono } 291223d0b79dSTomohiro Misono 291323d0b79dSTomohiro Misono /* Copy subvolume's name */ 291423d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 291523d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 291623d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 291723d0b79dSTomohiro Misono args->name[item_len] = 0; 291823d0b79dSTomohiro Misono 2919b8a49ae1SJosef Bacik out_put: 292000246528SJosef Bacik btrfs_put_root(root); 292123d0b79dSTomohiro Misono out: 292223d0b79dSTomohiro Misono btrfs_free_path(path); 292323d0b79dSTomohiro Misono return ret; 292423d0b79dSTomohiro Misono } 292523d0b79dSTomohiro Misono 2926dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2927ac8e9819SChris Mason void __user *argp) 2928ac8e9819SChris Mason { 2929ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 293001b810b8SDavid Sterba int ret = 0; 2931ac8e9819SChris Mason 29322354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 29332354d08fSJulia Lawall if (IS_ERR(args)) 29342354d08fSJulia Lawall return PTR_ERR(args); 2935c2b96929SDan Carpenter 293601b810b8SDavid Sterba /* 293701b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 293801b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 293901b810b8SDavid Sterba */ 29401b53ac4dSChris Mason if (args->treeid == 0) 2941dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 29421b53ac4dSChris Mason 294301b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 294401b810b8SDavid Sterba args->name[0] = 0; 294501b810b8SDavid Sterba goto out; 294601b810b8SDavid Sterba } 294701b810b8SDavid Sterba 294801b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 294901b810b8SDavid Sterba ret = -EPERM; 295001b810b8SDavid Sterba goto out; 295101b810b8SDavid Sterba } 295201b810b8SDavid Sterba 2953dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2954ac8e9819SChris Mason args->treeid, args->objectid, 2955ac8e9819SChris Mason args->name); 2956ac8e9819SChris Mason 295701b810b8SDavid Sterba out: 2958ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2959ac8e9819SChris Mason ret = -EFAULT; 2960ac8e9819SChris Mason 2961ac8e9819SChris Mason kfree(args); 296298d377a0STARUISI Hiroaki return ret; 296398d377a0STARUISI Hiroaki } 296498d377a0STARUISI Hiroaki 296523d0b79dSTomohiro Misono /* 296623d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 296723d0b79dSTomohiro Misono * 296823d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 296923d0b79dSTomohiro Misono * 297023d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 297123d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 297223d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 297323d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 297423d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 297523d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 297623d0b79dSTomohiro Misono */ 297723d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 297823d0b79dSTomohiro Misono { 297923d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 298023d0b79dSTomohiro Misono struct inode *inode; 298123d0b79dSTomohiro Misono int ret; 298223d0b79dSTomohiro Misono 298323d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 298423d0b79dSTomohiro Misono if (IS_ERR(args)) 298523d0b79dSTomohiro Misono return PTR_ERR(args); 298623d0b79dSTomohiro Misono 298723d0b79dSTomohiro Misono inode = file_inode(file); 298823d0b79dSTomohiro Misono 298923d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 299023d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 299123d0b79dSTomohiro Misono /* 299223d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 299323d0b79dSTomohiro Misono * called 299423d0b79dSTomohiro Misono */ 299523d0b79dSTomohiro Misono kfree(args); 299623d0b79dSTomohiro Misono return -EACCES; 299723d0b79dSTomohiro Misono } 299823d0b79dSTomohiro Misono 29996623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 300023d0b79dSTomohiro Misono 300123d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 300223d0b79dSTomohiro Misono ret = -EFAULT; 300323d0b79dSTomohiro Misono 300423d0b79dSTomohiro Misono kfree(args); 300523d0b79dSTomohiro Misono return ret; 300623d0b79dSTomohiro Misono } 300723d0b79dSTomohiro Misono 3008b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 30099ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 3010b64ec075STomohiro Misono { 3011b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 3012b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 3013b64ec075STomohiro Misono struct btrfs_root *root; 3014b64ec075STomohiro Misono struct btrfs_path *path; 3015b64ec075STomohiro Misono struct btrfs_key key; 3016b64ec075STomohiro Misono struct btrfs_root_item *root_item; 3017b64ec075STomohiro Misono struct btrfs_root_ref *rref; 3018b64ec075STomohiro Misono struct extent_buffer *leaf; 3019b64ec075STomohiro Misono unsigned long item_off; 3020b64ec075STomohiro Misono unsigned long item_len; 3021b64ec075STomohiro Misono int slot; 3022b64ec075STomohiro Misono int ret = 0; 3023b64ec075STomohiro Misono 3024b64ec075STomohiro Misono path = btrfs_alloc_path(); 3025b64ec075STomohiro Misono if (!path) 3026b64ec075STomohiro Misono return -ENOMEM; 3027b64ec075STomohiro Misono 3028b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 3029b64ec075STomohiro Misono if (!subvol_info) { 3030b64ec075STomohiro Misono btrfs_free_path(path); 3031b64ec075STomohiro Misono return -ENOMEM; 3032b64ec075STomohiro Misono } 3033b64ec075STomohiro Misono 3034b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 3035b64ec075STomohiro Misono 3036b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 3037b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 303856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 3039b64ec075STomohiro Misono if (IS_ERR(root)) { 3040b64ec075STomohiro Misono ret = PTR_ERR(root); 304104734e84SJosef Bacik goto out_free; 304204734e84SJosef Bacik } 3043b64ec075STomohiro Misono root_item = &root->root_item; 3044b64ec075STomohiro Misono 3045b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 3046b64ec075STomohiro Misono 3047b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 3048b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 3049b64ec075STomohiro Misono 3050b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 3051b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 3052b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3053b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 3054b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3055b64ec075STomohiro Misono 3056b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 3057b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 3058b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 3059b64ec075STomohiro Misono 3060b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 3061b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 3062b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 3063b64ec075STomohiro Misono 3064b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 3065b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 3066b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 3067b64ec075STomohiro Misono 3068b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 3069b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 3070b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 3071b64ec075STomohiro Misono 3072b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 3073b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 3074b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 3075b64ec075STomohiro Misono key.offset = 0; 307604734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 3077b64ec075STomohiro Misono if (ret < 0) { 3078b64ec075STomohiro Misono goto out; 3079b64ec075STomohiro Misono } else if (path->slots[0] >= 3080b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 308104734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 3082b64ec075STomohiro Misono if (ret < 0) { 3083b64ec075STomohiro Misono goto out; 3084b64ec075STomohiro Misono } else if (ret > 0) { 3085b64ec075STomohiro Misono ret = -EUCLEAN; 3086b64ec075STomohiro Misono goto out; 3087b64ec075STomohiro Misono } 3088b64ec075STomohiro Misono } 3089b64ec075STomohiro Misono 3090b64ec075STomohiro Misono leaf = path->nodes[0]; 3091b64ec075STomohiro Misono slot = path->slots[0]; 3092b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 3093b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 3094b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 3095b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 3096b64ec075STomohiro Misono 3097b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 3098b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 3099b64ec075STomohiro Misono 3100b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 3101b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 31023212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 3103b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 3104b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 3105b64ec075STomohiro Misono item_off, item_len); 3106b64ec075STomohiro Misono } else { 3107b64ec075STomohiro Misono ret = -ENOENT; 3108b64ec075STomohiro Misono goto out; 3109b64ec075STomohiro Misono } 3110b64ec075STomohiro Misono } 3111b64ec075STomohiro Misono 3112013c1c55SAnand Jain btrfs_free_path(path); 3113013c1c55SAnand Jain path = NULL; 3114b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 3115b64ec075STomohiro Misono ret = -EFAULT; 3116b64ec075STomohiro Misono 3117b64ec075STomohiro Misono out: 311800246528SJosef Bacik btrfs_put_root(root); 311904734e84SJosef Bacik out_free: 3120b64ec075STomohiro Misono btrfs_free_path(path); 3121b091f7feSWaiman Long kfree(subvol_info); 3122b64ec075STomohiro Misono return ret; 3123b64ec075STomohiro Misono } 3124b64ec075STomohiro Misono 312542e4b520STomohiro Misono /* 312642e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 312742e4b520STomohiro Misono * except the subvolume name. 312842e4b520STomohiro Misono */ 31299ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 3130dc408ccdSSahil Kang void __user *argp) 313142e4b520STomohiro Misono { 313242e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 313342e4b520STomohiro Misono struct btrfs_root_ref *rref; 313442e4b520STomohiro Misono struct btrfs_path *path; 313542e4b520STomohiro Misono struct btrfs_key key; 313642e4b520STomohiro Misono struct extent_buffer *leaf; 313742e4b520STomohiro Misono u64 objectid; 313842e4b520STomohiro Misono int slot; 313942e4b520STomohiro Misono int ret; 314042e4b520STomohiro Misono u8 found; 314142e4b520STomohiro Misono 314242e4b520STomohiro Misono path = btrfs_alloc_path(); 314342e4b520STomohiro Misono if (!path) 314442e4b520STomohiro Misono return -ENOMEM; 314542e4b520STomohiro Misono 314642e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 314742e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 314842e4b520STomohiro Misono btrfs_free_path(path); 314942e4b520STomohiro Misono return PTR_ERR(rootrefs); 315042e4b520STomohiro Misono } 315142e4b520STomohiro Misono 31529ad12305SSahil Kang objectid = root->root_key.objectid; 315342e4b520STomohiro Misono key.objectid = objectid; 315442e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 315542e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 315642e4b520STomohiro Misono found = 0; 315742e4b520STomohiro Misono 31589ad12305SSahil Kang root = root->fs_info->tree_root; 315942e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 316042e4b520STomohiro Misono if (ret < 0) { 316142e4b520STomohiro Misono goto out; 316242e4b520STomohiro Misono } else if (path->slots[0] >= 316342e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 316442e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 316542e4b520STomohiro Misono if (ret < 0) { 316642e4b520STomohiro Misono goto out; 316742e4b520STomohiro Misono } else if (ret > 0) { 316842e4b520STomohiro Misono ret = -EUCLEAN; 316942e4b520STomohiro Misono goto out; 317042e4b520STomohiro Misono } 317142e4b520STomohiro Misono } 317242e4b520STomohiro Misono while (1) { 317342e4b520STomohiro Misono leaf = path->nodes[0]; 317442e4b520STomohiro Misono slot = path->slots[0]; 317542e4b520STomohiro Misono 317642e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 317742e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 317842e4b520STomohiro Misono ret = 0; 317942e4b520STomohiro Misono goto out; 318042e4b520STomohiro Misono } 318142e4b520STomohiro Misono 318242e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 318342e4b520STomohiro Misono ret = -EOVERFLOW; 318442e4b520STomohiro Misono goto out; 318542e4b520STomohiro Misono } 318642e4b520STomohiro Misono 318742e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 318842e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 318942e4b520STomohiro Misono rootrefs->rootref[found].dirid = 319042e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 319142e4b520STomohiro Misono found++; 319242e4b520STomohiro Misono 319342e4b520STomohiro Misono ret = btrfs_next_item(root, path); 319442e4b520STomohiro Misono if (ret < 0) { 319542e4b520STomohiro Misono goto out; 319642e4b520STomohiro Misono } else if (ret > 0) { 319742e4b520STomohiro Misono ret = -EUCLEAN; 319842e4b520STomohiro Misono goto out; 319942e4b520STomohiro Misono } 320042e4b520STomohiro Misono } 320142e4b520STomohiro Misono 320242e4b520STomohiro Misono out: 3203b740d806SJosef Bacik btrfs_free_path(path); 3204b740d806SJosef Bacik 320542e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 320642e4b520STomohiro Misono rootrefs->num_items = found; 320742e4b520STomohiro Misono /* update min_treeid for next search */ 320842e4b520STomohiro Misono if (found) 320942e4b520STomohiro Misono rootrefs->min_treeid = 321042e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 321142e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 321242e4b520STomohiro Misono ret = -EFAULT; 321342e4b520STomohiro Misono } 321442e4b520STomohiro Misono 321542e4b520STomohiro Misono kfree(rootrefs); 321642e4b520STomohiro Misono 321742e4b520STomohiro Misono return ret; 321842e4b520STomohiro Misono } 321942e4b520STomohiro Misono 322076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3221949964c9SMarcos Paulo de Souza void __user *arg, 3222949964c9SMarcos Paulo de Souza bool destroy_v2) 322376dda93cSYan, Zheng { 322454563d41SAl Viro struct dentry *parent = file->f_path.dentry; 32250b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 322676dda93cSYan, Zheng struct dentry *dentry; 32272b0143b5SDavid Howells struct inode *dir = d_inode(parent); 322876dda93cSYan, Zheng struct inode *inode; 322976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 323076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3231949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3232949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3233c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3234949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3235949964c9SMarcos Paulo de Souza int subvol_namelen; 323676dda93cSYan, Zheng int err = 0; 3237949964c9SMarcos Paulo de Souza bool destroy_parent = false; 323876dda93cSYan, Zheng 3239813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 3240813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3241813febdbSJosef Bacik btrfs_err(fs_info, 3242813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 3243813febdbSJosef Bacik return -EOPNOTSUPP; 3244813febdbSJosef Bacik } 3245813febdbSJosef Bacik 3246949964c9SMarcos Paulo de Souza if (destroy_v2) { 3247949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3248949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3249949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3250325c50e3SJeff Mahoney 3251949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3252949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3253949964c9SMarcos Paulo de Souza goto out; 3254949964c9SMarcos Paulo de Souza } 325576dda93cSYan, Zheng 3256949964c9SMarcos Paulo de Souza /* 3257949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3258949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3259949964c9SMarcos Paulo de Souza */ 3260949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3261949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3262949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3263949964c9SMarcos Paulo de Souza 3264949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3265949964c9SMarcos Paulo de Souza if (err) 3266949964c9SMarcos Paulo de Souza goto out; 3267949964c9SMarcos Paulo de Souza } else { 3268aabb34e7SChristian Brauner struct inode *old_dir; 3269c4ed533bSChristian Brauner 3270949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 327176dda93cSYan, Zheng err = -EINVAL; 327276dda93cSYan, Zheng goto out; 327376dda93cSYan, Zheng } 327476dda93cSYan, Zheng 3275a561be71SAl Viro err = mnt_want_write_file(file); 327676dda93cSYan, Zheng if (err) 327776dda93cSYan, Zheng goto out; 327876dda93cSYan, Zheng 3279949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3280949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3281b307f06dSDavid Sterba vol_args2->subvolid, 0); 3282949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3283949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3284949964c9SMarcos Paulo de Souza goto out_drop_write; 3285949964c9SMarcos Paulo de Souza } 3286949964c9SMarcos Paulo de Souza 3287949964c9SMarcos Paulo de Souza /* 3288949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3289949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3290949964c9SMarcos Paulo de Souza */ 3291949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3292949964c9SMarcos Paulo de Souza 3293949964c9SMarcos Paulo de Souza /* 3294949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3295949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3296949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3297949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3298949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3299949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3300949964c9SMarcos Paulo de Souza */ 3301949964c9SMarcos Paulo de Souza dput(dentry); 3302949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3303949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3304949964c9SMarcos Paulo de Souza goto out_drop_write; 3305949964c9SMarcos Paulo de Souza } 3306aabb34e7SChristian Brauner old_dir = dir; 3307949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3308949964c9SMarcos Paulo de Souza 3309949964c9SMarcos Paulo de Souza /* 3310949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3311949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3312949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3313949964c9SMarcos Paulo de Souza * new parent dentry. 3314949964c9SMarcos Paulo de Souza */ 3315949964c9SMarcos Paulo de Souza destroy_parent = true; 3316949964c9SMarcos Paulo de Souza 3317aabb34e7SChristian Brauner /* 3318aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3319aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3320aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3321aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3322aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3323aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3324aabb34e7SChristian Brauner * to delete without an idmapped mount. 3325aabb34e7SChristian Brauner */ 3326aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3327aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3328aabb34e7SChristian Brauner goto free_parent; 3329aabb34e7SChristian Brauner } 3330aabb34e7SChristian Brauner 3331949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3332949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3333949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3334949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3335949964c9SMarcos Paulo de Souza goto free_parent; 3336949964c9SMarcos Paulo de Souza } 33371a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3338949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3339949964c9SMarcos Paulo de Souza } 3340949964c9SMarcos Paulo de Souza } else { 3341949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3342949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3343949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3344949964c9SMarcos Paulo de Souza 3345949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3346949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3347949964c9SMarcos Paulo de Souza 3348949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3349949964c9SMarcos Paulo de Souza if (err) 3350949964c9SMarcos Paulo de Souza goto out; 3351949964c9SMarcos Paulo de Souza } 3352949964c9SMarcos Paulo de Souza 3353949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3354949964c9SMarcos Paulo de Souza 3355949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3356949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3357949964c9SMarcos Paulo de Souza err = -EINVAL; 3358949964c9SMarcos Paulo de Souza goto free_subvol_name; 3359949964c9SMarcos Paulo de Souza } 3360949964c9SMarcos Paulo de Souza 3361949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3362949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3363949964c9SMarcos Paulo de Souza goto free_subvol_name; 3364949964c9SMarcos Paulo de Souza } 3365521e0546SDavid Sterba 336600235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 336700235411SAl Viro if (err == -EINTR) 3368949964c9SMarcos Paulo de Souza goto free_subvol_name; 3369c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 337076dda93cSYan, Zheng if (IS_ERR(dentry)) { 337176dda93cSYan, Zheng err = PTR_ERR(dentry); 337276dda93cSYan, Zheng goto out_unlock_dir; 337376dda93cSYan, Zheng } 337476dda93cSYan, Zheng 33752b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 337676dda93cSYan, Zheng err = -ENOENT; 337776dda93cSYan, Zheng goto out_dput; 337876dda93cSYan, Zheng } 337976dda93cSYan, Zheng 33802b0143b5SDavid Howells inode = d_inode(dentry); 33814260f7c7SSage Weil dest = BTRFS_I(inode)->root; 33824260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 33834260f7c7SSage Weil /* 33844260f7c7SSage Weil * Regular user. Only allow this with a special mount 33854260f7c7SSage Weil * option, when the user has write+exec access to the 33864260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 33874260f7c7SSage Weil * allowed. 33884260f7c7SSage Weil * 33894260f7c7SSage Weil * Note that this is _not_ check that the subvol is 33904260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 33914260f7c7SSage Weil * otherwise be able to delete. 33924260f7c7SSage Weil * 33934260f7c7SSage Weil * Users who want to delete empty subvols should try 33944260f7c7SSage Weil * rmdir(2). 33954260f7c7SSage Weil */ 33964260f7c7SSage Weil err = -EPERM; 33970b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 33984260f7c7SSage Weil goto out_dput; 33994260f7c7SSage Weil 34004260f7c7SSage Weil /* 34014260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 34024260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 34034260f7c7SSage Weil * must be called on the dentry referencing the root 34044260f7c7SSage Weil * of the subvol, not a random directory contained 34054260f7c7SSage Weil * within it. 34064260f7c7SSage Weil */ 34074260f7c7SSage Weil err = -EINVAL; 34084260f7c7SSage Weil if (root == dest) 34094260f7c7SSage Weil goto out_dput; 34104260f7c7SSage Weil 3411c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 34124260f7c7SSage Weil if (err) 34134260f7c7SSage Weil goto out_dput; 34145c39da5bSMiao Xie } 34154260f7c7SSage Weil 34165c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3417c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 34184260f7c7SSage Weil if (err) 34194260f7c7SSage Weil goto out_dput; 34204260f7c7SSage Weil 34214a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 342276dda93cSYan, Zheng err = -EINVAL; 342376dda93cSYan, Zheng goto out_dput; 342476dda93cSYan, Zheng } 342576dda93cSYan, Zheng 342664708539SJosef Bacik btrfs_inode_lock(inode, 0); 3427f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 342864708539SJosef Bacik btrfs_inode_unlock(inode, 0); 3429a37d9a17SAmir Goldstein if (!err) 3430a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 3431fa6ac876SLiu Bo 343276dda93cSYan, Zheng out_dput: 343376dda93cSYan, Zheng dput(dentry); 343476dda93cSYan, Zheng out_unlock_dir: 343564708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3436949964c9SMarcos Paulo de Souza free_subvol_name: 3437949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3438949964c9SMarcos Paulo de Souza free_parent: 3439949964c9SMarcos Paulo de Souza if (destroy_parent) 3440949964c9SMarcos Paulo de Souza dput(parent); 344100235411SAl Viro out_drop_write: 34422a79f17eSAl Viro mnt_drop_write_file(file); 344376dda93cSYan, Zheng out: 3444949964c9SMarcos Paulo de Souza kfree(vol_args2); 344576dda93cSYan, Zheng kfree(vol_args); 344676dda93cSYan, Zheng return err; 344776dda93cSYan, Zheng } 344876dda93cSYan, Zheng 34491e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3450f46b5a66SChristoph Hellwig { 3451496ad9aaSAl Viro struct inode *inode = file_inode(file); 3452f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3453c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3454c146afadSYan Zheng int ret; 3455c146afadSYan Zheng 345625122d15SIlya Dryomov ret = mnt_want_write_file(file); 345725122d15SIlya Dryomov if (ret) 345825122d15SIlya Dryomov return ret; 3459b83cc969SLi Zefan 346025122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 346125122d15SIlya Dryomov ret = -EROFS; 346225122d15SIlya Dryomov goto out; 34635ac00addSStefan Behrens } 3464f46b5a66SChristoph Hellwig 3465f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3466f46b5a66SChristoph Hellwig case S_IFDIR: 3467e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3468e441d54dSChris Mason ret = -EPERM; 3469e441d54dSChris Mason goto out; 3470e441d54dSChris Mason } 3471de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3472f46b5a66SChristoph Hellwig break; 3473f46b5a66SChristoph Hellwig case S_IFREG: 3474616d374eSAdam Borowski /* 3475616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3476616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3477616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3478616d374eSAdam Borowski */ 3479616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 348047291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3481616d374eSAdam Borowski ret = -EPERM; 3482e441d54dSChris Mason goto out; 3483e441d54dSChris Mason } 34841e701a32SChris Mason 34851e701a32SChris Mason if (argp) { 3486c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 34871e701a32SChris Mason ret = -EFAULT; 3488683be16eSDan Carpenter goto out; 34891e701a32SChris Mason } 34901e701a32SChris Mason /* compression requires us to start the IO */ 3491c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3492c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3493c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 34941e701a32SChris Mason } 34951e701a32SChris Mason } else { 34961e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3497c853a578SGoldwyn Rodrigues range.len = (u64)-1; 34981e701a32SChris Mason } 34991ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3500c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 35014cb5300bSChris Mason if (ret > 0) 35024cb5300bSChris Mason ret = 0; 3503f46b5a66SChristoph Hellwig break; 35048929ecfaSYan, Zheng default: 35058929ecfaSYan, Zheng ret = -EINVAL; 3506f46b5a66SChristoph Hellwig } 3507e441d54dSChris Mason out: 350825122d15SIlya Dryomov mnt_drop_write_file(file); 3509e441d54dSChris Mason return ret; 3510f46b5a66SChristoph Hellwig } 3511f46b5a66SChristoph Hellwig 35122ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3513f46b5a66SChristoph Hellwig { 3514f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3515a174c0a2SNikolay Borisov bool restore_op = false; 3516f46b5a66SChristoph Hellwig int ret; 3517f46b5a66SChristoph Hellwig 3518e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3519e441d54dSChris Mason return -EPERM; 3520e441d54dSChris Mason 3521914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3522914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 3523914a519bSJosef Bacik return -EINVAL; 3524914a519bSJosef Bacik } 3525914a519bSJosef Bacik 3526a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 3527a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3528e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3529c9e9f97bSIlya Dryomov 3530a174c0a2SNikolay Borisov /* 3531a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 3532a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 3533a174c0a2SNikolay Borisov * back the paused balance 3534a174c0a2SNikolay Borisov */ 3535a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 3536a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 3537a174c0a2SNikolay Borisov restore_op = true; 3538a174c0a2SNikolay Borisov } 3539a174c0a2SNikolay Borisov 3540dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3541c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3542c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3543c9e9f97bSIlya Dryomov goto out; 3544c9e9f97bSIlya Dryomov } 3545f46b5a66SChristoph Hellwig 35465516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 35472ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3548f46b5a66SChristoph Hellwig 354943d20761SAnand Jain if (!ret) 35500b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 355143d20761SAnand Jain 3552f46b5a66SChristoph Hellwig kfree(vol_args); 3553c9e9f97bSIlya Dryomov out: 3554a174c0a2SNikolay Borisov if (restore_op) 3555a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 3556a174c0a2SNikolay Borisov else 3557c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3558f46b5a66SChristoph Hellwig return ret; 3559f46b5a66SChristoph Hellwig } 3560f46b5a66SChristoph Hellwig 35616b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3562f46b5a66SChristoph Hellwig { 35631a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35640b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35650b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 35666b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 35673fa421deSJosef Bacik struct block_device *bdev = NULL; 35683fa421deSJosef Bacik fmode_t mode; 3569f46b5a66SChristoph Hellwig int ret; 357067ae34b6SDavid Sterba bool cancel = false; 3571f46b5a66SChristoph Hellwig 3572e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3573e441d54dSChris Mason return -EPERM; 3574e441d54dSChris Mason 3575dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3576d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 3577d815b3f2SDan Carpenter return PTR_ERR(vol_args); 3578f46b5a66SChristoph Hellwig 3579748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3580fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3581fd4e994bSOmar Sandoval goto out; 3582fd4e994bSOmar Sandoval } 35831a15eb72SJosef Bacik 35846b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 35851a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 35861a15eb72SJosef Bacik args.devid = vol_args->devid; 35871a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 358867ae34b6SDavid Sterba cancel = true; 35891a15eb72SJosef Bacik } else { 35901a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 35911a15eb72SJosef Bacik if (ret) 35921a15eb72SJosef Bacik goto out; 35931a15eb72SJosef Bacik } 35941a15eb72SJosef Bacik 35951a15eb72SJosef Bacik ret = mnt_want_write_file(file); 35961a15eb72SJosef Bacik if (ret) 35971a15eb72SJosef Bacik goto out; 359867ae34b6SDavid Sterba 359967ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 360067ae34b6SDavid Sterba cancel); 360167ae34b6SDavid Sterba if (ret) 36021a15eb72SJosef Bacik goto err_drop; 360367ae34b6SDavid Sterba 36041a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 36051a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 360667ae34b6SDavid Sterba 3607c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3608183860f6SAnand Jain 36096b526ed7SAnand Jain if (!ret) { 3610735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 36110b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 36126b526ed7SAnand Jain vol_args->devid); 36136b526ed7SAnand Jain else 36140b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 36156b526ed7SAnand Jain vol_args->name); 36166b526ed7SAnand Jain } 3617c47ca32dSDan Carpenter err_drop: 36184ac20c70SIlya Dryomov mnt_drop_write_file(file); 36193fa421deSJosef Bacik if (bdev) 36203fa421deSJosef Bacik blkdev_put(bdev, mode); 36211a15eb72SJosef Bacik out: 36221a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36231a15eb72SJosef Bacik kfree(vol_args); 3624f46b5a66SChristoph Hellwig return ret; 3625f46b5a66SChristoph Hellwig } 3626f46b5a66SChristoph Hellwig 3627f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3628f46b5a66SChristoph Hellwig { 36291a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 36300b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36310b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3632f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 36333fa421deSJosef Bacik struct block_device *bdev = NULL; 36343fa421deSJosef Bacik fmode_t mode; 3635f46b5a66SChristoph Hellwig int ret; 363637b45995STom Rix bool cancel = false; 3637f46b5a66SChristoph Hellwig 3638f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3639f46b5a66SChristoph Hellwig return -EPERM; 3640f46b5a66SChristoph Hellwig 36411a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 36421a15eb72SJosef Bacik if (IS_ERR(vol_args)) 36431a15eb72SJosef Bacik return PTR_ERR(vol_args); 36441a15eb72SJosef Bacik 36451a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 36461a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 36471a15eb72SJosef Bacik cancel = true; 36481a15eb72SJosef Bacik } else { 36491a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 36501a15eb72SJosef Bacik if (ret) 36511a15eb72SJosef Bacik goto out; 36521a15eb72SJosef Bacik } 36531a15eb72SJosef Bacik 3654f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3655f46b5a66SChristoph Hellwig if (ret) 36561a15eb72SJosef Bacik goto out; 3657f46b5a66SChristoph Hellwig 365867ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 365967ae34b6SDavid Sterba cancel); 366067ae34b6SDavid Sterba if (ret == 0) { 36611a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 3662f46b5a66SChristoph Hellwig if (!ret) 36630b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3664c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 366567ae34b6SDavid Sterba } 366667ae34b6SDavid Sterba 3667f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 36683fa421deSJosef Bacik if (bdev) 36693fa421deSJosef Bacik blkdev_put(bdev, mode); 36701a15eb72SJosef Bacik out: 36711a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36721a15eb72SJosef Bacik kfree(vol_args); 3673f46b5a66SChristoph Hellwig return ret; 3674f46b5a66SChristoph Hellwig } 3675f46b5a66SChristoph Hellwig 36762ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 36772ff7e61eSJeff Mahoney void __user *arg) 3678475f6387SJan Schmidt { 3679027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3680475f6387SJan Schmidt struct btrfs_device *device; 36810b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3682137c5418SJohannes Thumshirn u64 flags_in; 3683027ed2f0SLi Zefan int ret = 0; 3684475f6387SJan Schmidt 3685137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3686137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3687137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3688137c5418SJohannes Thumshirn 3689137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3690137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3691027ed2f0SLi Zefan 3692d03262c7SDavid Sterba rcu_read_lock(); 3693027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3694475f6387SJan Schmidt 3695d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3696027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3697027ed2f0SLi Zefan fi_args->max_id = device->devid; 3698475f6387SJan Schmidt } 3699d03262c7SDavid Sterba rcu_read_unlock(); 3700475f6387SJan Schmidt 3701de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3702bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3703bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3704bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 370580a773fbSDavid Sterba 3706137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3707137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3708137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3709137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3710137c5418SJohannes Thumshirn } 3711137c5418SJohannes Thumshirn 37120fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 37130fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 37140fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 37150fb408a5SJohannes Thumshirn } 37160fb408a5SJohannes Thumshirn 371749bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 371849bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 371949bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 372049bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 372149bac897SJohannes Thumshirn } 372249bac897SJohannes Thumshirn 3723027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3724027ed2f0SLi Zefan ret = -EFAULT; 3725475f6387SJan Schmidt 3726027ed2f0SLi Zefan kfree(fi_args); 3727027ed2f0SLi Zefan return ret; 3728475f6387SJan Schmidt } 3729475f6387SJan Schmidt 37302ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 37312ff7e61eSJeff Mahoney void __user *arg) 3732475f6387SJan Schmidt { 3733562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 3734475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3735475f6387SJan Schmidt struct btrfs_device *dev; 3736475f6387SJan Schmidt int ret = 0; 3737475f6387SJan Schmidt 3738475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3739475f6387SJan Schmidt if (IS_ERR(di_args)) 3740475f6387SJan Schmidt return PTR_ERR(di_args); 3741475f6387SJan Schmidt 3742562d7b15SJosef Bacik args.devid = di_args->devid; 3743dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3744562d7b15SJosef Bacik args.uuid = di_args->uuid; 3745475f6387SJan Schmidt 3746c5593ca3SDavid Sterba rcu_read_lock(); 3747562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 3748475f6387SJan Schmidt if (!dev) { 3749475f6387SJan Schmidt ret = -ENODEV; 3750475f6387SJan Schmidt goto out; 3751475f6387SJan Schmidt } 3752475f6387SJan Schmidt 3753475f6387SJan Schmidt di_args->devid = dev->devid; 37547cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 37557cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3756475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3757a27202fbSJim Meyering if (dev->name) { 3758672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3759672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3760a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3761a27202fbSJim Meyering } else { 376299ba55adSStefan Behrens di_args->path[0] = '\0'; 3763a27202fbSJim Meyering } 3764475f6387SJan Schmidt 3765475f6387SJan Schmidt out: 3766c5593ca3SDavid Sterba rcu_read_unlock(); 3767475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3768475f6387SJan Schmidt ret = -EFAULT; 3769475f6387SJan Schmidt 3770475f6387SJan Schmidt kfree(di_args); 3771475f6387SJan Schmidt return ret; 3772475f6387SJan Schmidt } 3773475f6387SJan Schmidt 37746ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37756ef5ed0dSJosef Bacik { 3776496ad9aaSAl Viro struct inode *inode = file_inode(file); 37770b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37786ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37796ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37806ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37816ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37822a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 37836ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37846db75318SSweet Tea Dorminy struct fscrypt_str name = FSTR_INIT("default", 7); 37856ef5ed0dSJosef Bacik u64 objectid = 0; 37866ef5ed0dSJosef Bacik u64 dir_id; 37873c04ce01SMiao Xie int ret; 37886ef5ed0dSJosef Bacik 37896ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37906ef5ed0dSJosef Bacik return -EPERM; 37916ef5ed0dSJosef Bacik 37923c04ce01SMiao Xie ret = mnt_want_write_file(file); 37933c04ce01SMiao Xie if (ret) 37943c04ce01SMiao Xie return ret; 37953c04ce01SMiao Xie 37963c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37973c04ce01SMiao Xie ret = -EFAULT; 37983c04ce01SMiao Xie goto out; 37993c04ce01SMiao Xie } 38006ef5ed0dSJosef Bacik 38016ef5ed0dSJosef Bacik if (!objectid) 38021cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 38036ef5ed0dSJosef Bacik 380456e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 38053c04ce01SMiao Xie if (IS_ERR(new_root)) { 38063c04ce01SMiao Xie ret = PTR_ERR(new_root); 38073c04ce01SMiao Xie goto out; 38083c04ce01SMiao Xie } 38092a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 38102a2b5d62SJosef Bacik ret = -ENOENT; 38112a2b5d62SJosef Bacik goto out_free; 38122a2b5d62SJosef Bacik } 38136ef5ed0dSJosef Bacik 38146ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 38153c04ce01SMiao Xie if (!path) { 38163c04ce01SMiao Xie ret = -ENOMEM; 38172a2b5d62SJosef Bacik goto out_free; 38183c04ce01SMiao Xie } 38196ef5ed0dSJosef Bacik 38206ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 382198d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38223c04ce01SMiao Xie ret = PTR_ERR(trans); 38232a2b5d62SJosef Bacik goto out_free; 38246ef5ed0dSJosef Bacik } 38256ef5ed0dSJosef Bacik 38260b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 38270b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 3828e43eec81SSweet Tea Dorminy dir_id, &name, 1); 3829cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38302a2b5d62SJosef Bacik btrfs_release_path(path); 38313a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38320b246afaSJeff Mahoney btrfs_err(fs_info, 38335d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 38343c04ce01SMiao Xie ret = -ENOENT; 38352a2b5d62SJosef Bacik goto out_free; 38366ef5ed0dSJosef Bacik } 38376ef5ed0dSJosef Bacik 38386ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38396ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38406ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38412a2b5d62SJosef Bacik btrfs_release_path(path); 38426ef5ed0dSJosef Bacik 38430b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 38443a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38452a2b5d62SJosef Bacik out_free: 384600246528SJosef Bacik btrfs_put_root(new_root); 38472a2b5d62SJosef Bacik btrfs_free_path(path); 38483c04ce01SMiao Xie out: 38493c04ce01SMiao Xie mnt_drop_write_file(file); 38503c04ce01SMiao Xie return ret; 38516ef5ed0dSJosef Bacik } 38526ef5ed0dSJosef Bacik 3853c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3854bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3855bf5fc093SJosef Bacik { 385632da5386SDavid Sterba struct btrfs_block_group *block_group; 3857bf5fc093SJosef Bacik 3858bf5fc093SJosef Bacik space->total_bytes = 0; 3859bf5fc093SJosef Bacik space->used_bytes = 0; 3860bf5fc093SJosef Bacik space->flags = 0; 3861bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3862bf5fc093SJosef Bacik space->flags = block_group->flags; 3863b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3864bf38be65SDavid Sterba space->used_bytes += block_group->used; 3865bf5fc093SJosef Bacik } 3866bf5fc093SJosef Bacik } 3867bf5fc093SJosef Bacik 38682ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 38692ff7e61eSJeff Mahoney void __user *arg) 38701406e432SJosef Bacik { 38711406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38721406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38731406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38747fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 387513f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38761406e432SJosef Bacik struct btrfs_space_info *info; 3877315d8e98SColin Ian King static const u64 types[] = { 3878315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3879bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3880bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3881315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3882315d8e98SColin Ian King }; 3883bf5fc093SJosef Bacik int num_types = 4; 38847fde62bfSChris Mason int alloc_size; 38851406e432SJosef Bacik int ret = 0; 388651788b1bSDan Rosenberg u64 slot_count = 0; 3887bf5fc093SJosef Bacik int i, c; 38881406e432SJosef Bacik 38891406e432SJosef Bacik if (copy_from_user(&space_args, 38901406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38911406e432SJosef Bacik sizeof(space_args))) 38921406e432SJosef Bacik return -EFAULT; 38931406e432SJosef Bacik 3894bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3895bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3896bf5fc093SJosef Bacik 3897bf5fc093SJosef Bacik info = NULL; 389872804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3899bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3900bf5fc093SJosef Bacik info = tmp; 3901bf5fc093SJosef Bacik break; 3902bf5fc093SJosef Bacik } 3903bf5fc093SJosef Bacik } 39041406e432SJosef Bacik 3905bf5fc093SJosef Bacik if (!info) 3906bf5fc093SJosef Bacik continue; 3907bf5fc093SJosef Bacik 3908bf5fc093SJosef Bacik down_read(&info->groups_sem); 3909bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3910bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3911bf5fc093SJosef Bacik slot_count++; 3912bf5fc093SJosef Bacik } 3913bf5fc093SJosef Bacik up_read(&info->groups_sem); 3914bf5fc093SJosef Bacik } 3915bf5fc093SJosef Bacik 391636523e95SDavid Sterba /* 391736523e95SDavid Sterba * Global block reserve, exported as a space_info 391836523e95SDavid Sterba */ 391936523e95SDavid Sterba slot_count++; 392036523e95SDavid Sterba 39217fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39227fde62bfSChris Mason if (space_args.space_slots == 0) { 39237fde62bfSChris Mason space_args.total_spaces = slot_count; 39247fde62bfSChris Mason goto out; 39257fde62bfSChris Mason } 3926bf5fc093SJosef Bacik 392751788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3928bf5fc093SJosef Bacik 39297fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3930bf5fc093SJosef Bacik 39317fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39327fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39337fde62bfSChris Mason */ 393409cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 39357fde62bfSChris Mason return -ENOMEM; 39367fde62bfSChris Mason 39377fde62bfSChris Mason space_args.total_spaces = 0; 39388d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 39397fde62bfSChris Mason if (!dest) 39407fde62bfSChris Mason return -ENOMEM; 39417fde62bfSChris Mason dest_orig = dest; 39427fde62bfSChris Mason 39437fde62bfSChris Mason /* now we have a buffer to copy into */ 3944bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3945bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3946bf5fc093SJosef Bacik 394751788b1bSDan Rosenberg if (!slot_count) 394851788b1bSDan Rosenberg break; 394951788b1bSDan Rosenberg 3950bf5fc093SJosef Bacik info = NULL; 395172804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3952bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3953bf5fc093SJosef Bacik info = tmp; 39547fde62bfSChris Mason break; 3955bf5fc093SJosef Bacik } 3956bf5fc093SJosef Bacik } 39577fde62bfSChris Mason 3958bf5fc093SJosef Bacik if (!info) 3959bf5fc093SJosef Bacik continue; 3960bf5fc093SJosef Bacik down_read(&info->groups_sem); 3961bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3962bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3963c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3964c065f5b1SSu Yue &space); 39657fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39661406e432SJosef Bacik dest++; 39671406e432SJosef Bacik space_args.total_spaces++; 396851788b1bSDan Rosenberg slot_count--; 39691406e432SJosef Bacik } 397051788b1bSDan Rosenberg if (!slot_count) 397151788b1bSDan Rosenberg break; 3972bf5fc093SJosef Bacik } 3973bf5fc093SJosef Bacik up_read(&info->groups_sem); 3974bf5fc093SJosef Bacik } 39751406e432SJosef Bacik 397636523e95SDavid Sterba /* 397736523e95SDavid Sterba * Add global block reserve 397836523e95SDavid Sterba */ 397936523e95SDavid Sterba if (slot_count) { 39800b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 398136523e95SDavid Sterba 398236523e95SDavid Sterba spin_lock(&block_rsv->lock); 398336523e95SDavid Sterba space.total_bytes = block_rsv->size; 398436523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 398536523e95SDavid Sterba spin_unlock(&block_rsv->lock); 398636523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 398736523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 398836523e95SDavid Sterba space_args.total_spaces++; 398936523e95SDavid Sterba } 399036523e95SDavid Sterba 39912eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39927fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39937fde62bfSChris Mason 39947fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39957fde62bfSChris Mason ret = -EFAULT; 39967fde62bfSChris Mason 39977fde62bfSChris Mason kfree(dest_orig); 39987fde62bfSChris Mason out: 39997fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 40001406e432SJosef Bacik ret = -EFAULT; 40011406e432SJosef Bacik 40021406e432SJosef Bacik return ret; 40031406e432SJosef Bacik } 40041406e432SJosef Bacik 40059a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 40069a8c28beSMiao Xie void __user *argp) 400746204592SSage Weil { 400846204592SSage Weil struct btrfs_trans_handle *trans; 400946204592SSage Weil u64 transid; 401046204592SSage Weil 4011d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4012ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4013ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 401498d5dc13STsutomu Itoh return PTR_ERR(trans); 4015ff7c1d33SMiao Xie 4016ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4017ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4018ff7c1d33SMiao Xie goto out; 4019ff7c1d33SMiao Xie } 402046204592SSage Weil transid = trans->transid; 4021fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 4022ff7c1d33SMiao Xie out: 402346204592SSage Weil if (argp) 402446204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 402546204592SSage Weil return -EFAULT; 402646204592SSage Weil return 0; 402746204592SSage Weil } 402846204592SSage Weil 40292ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 40309a8c28beSMiao Xie void __user *argp) 403146204592SSage Weil { 403246204592SSage Weil u64 transid; 403346204592SSage Weil 403446204592SSage Weil if (argp) { 403546204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 403646204592SSage Weil return -EFAULT; 403746204592SSage Weil } else { 403846204592SSage Weil transid = 0; /* current trans */ 403946204592SSage Weil } 40402ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 404146204592SSage Weil } 404246204592SSage Weil 4043b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4044475f6387SJan Schmidt { 40450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 4046475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4047b8e95489SMiao Xie int ret; 4048475f6387SJan Schmidt 4049475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4050475f6387SJan Schmidt return -EPERM; 4051475f6387SJan Schmidt 4052da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4053da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 4054da32c6d5SJosef Bacik return -EINVAL; 4055da32c6d5SJosef Bacik } 4056da32c6d5SJosef Bacik 4057475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4058475f6387SJan Schmidt if (IS_ERR(sa)) 4059475f6387SJan Schmidt return PTR_ERR(sa); 4060475f6387SJan Schmidt 4061b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4062b8e95489SMiao Xie ret = mnt_want_write_file(file); 4063b8e95489SMiao Xie if (ret) 4064b8e95489SMiao Xie goto out; 4065b8e95489SMiao Xie } 4066b8e95489SMiao Xie 40670b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 406863a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 406963a212abSStefan Behrens 0); 4070475f6387SJan Schmidt 40715afe6ce7SFilipe Manana /* 40725afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 40735afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 40745afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 40755afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 40765afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 40775afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 40785afe6ce7SFilipe Manana * previously (btrfs-progs does this). 40795afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 40805afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 40815afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 40825afe6ce7SFilipe Manana */ 40835afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 4084475f6387SJan Schmidt ret = -EFAULT; 4085475f6387SJan Schmidt 4086b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4087b8e95489SMiao Xie mnt_drop_write_file(file); 4088b8e95489SMiao Xie out: 4089475f6387SJan Schmidt kfree(sa); 4090475f6387SJan Schmidt return ret; 4091475f6387SJan Schmidt } 4092475f6387SJan Schmidt 40932ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 4094475f6387SJan Schmidt { 4095475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4096475f6387SJan Schmidt return -EPERM; 4097475f6387SJan Schmidt 40982ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 4099475f6387SJan Schmidt } 4100475f6387SJan Schmidt 41012ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 4102475f6387SJan Schmidt void __user *arg) 4103475f6387SJan Schmidt { 4104475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4105475f6387SJan Schmidt int ret; 4106475f6387SJan Schmidt 4107475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4108475f6387SJan Schmidt return -EPERM; 4109475f6387SJan Schmidt 4110475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4111475f6387SJan Schmidt if (IS_ERR(sa)) 4112475f6387SJan Schmidt return PTR_ERR(sa); 4113475f6387SJan Schmidt 41142ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 4115475f6387SJan Schmidt 41164fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4117475f6387SJan Schmidt ret = -EFAULT; 4118475f6387SJan Schmidt 4119475f6387SJan Schmidt kfree(sa); 4120475f6387SJan Schmidt return ret; 4121475f6387SJan Schmidt } 4122475f6387SJan Schmidt 41232ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 4124b27f7c0cSDavid Sterba void __user *arg) 4125c11d2c23SStefan Behrens { 4126c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4127c11d2c23SStefan Behrens int ret; 4128c11d2c23SStefan Behrens 4129c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4130c11d2c23SStefan Behrens if (IS_ERR(sa)) 4131c11d2c23SStefan Behrens return PTR_ERR(sa); 4132c11d2c23SStefan Behrens 4133b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4134b27f7c0cSDavid Sterba kfree(sa); 4135b27f7c0cSDavid Sterba return -EPERM; 4136b27f7c0cSDavid Sterba } 4137b27f7c0cSDavid Sterba 41382ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4139c11d2c23SStefan Behrens 4140eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4141c11d2c23SStefan Behrens ret = -EFAULT; 4142c11d2c23SStefan Behrens 4143c11d2c23SStefan Behrens kfree(sa); 4144c11d2c23SStefan Behrens return ret; 4145c11d2c23SStefan Behrens } 4146c11d2c23SStefan Behrens 41472ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 41482ff7e61eSJeff Mahoney void __user *arg) 41493f6bcfbdSStefan Behrens { 41503f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41513f6bcfbdSStefan Behrens int ret; 41523f6bcfbdSStefan Behrens 41533f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41543f6bcfbdSStefan Behrens return -EPERM; 41553f6bcfbdSStefan Behrens 4156914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4157914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 4158914a519bSJosef Bacik return -EINVAL; 4159914a519bSJosef Bacik } 4160914a519bSJosef Bacik 41613f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41623f6bcfbdSStefan Behrens if (IS_ERR(p)) 41633f6bcfbdSStefan Behrens return PTR_ERR(p); 41643f6bcfbdSStefan Behrens 41653f6bcfbdSStefan Behrens switch (p->cmd) { 41663f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4167bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4168adfa97cbSIlya Dryomov ret = -EROFS; 4169adfa97cbSIlya Dryomov goto out; 4170adfa97cbSIlya Dryomov } 4171c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 4172e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41733f6bcfbdSStefan Behrens } else { 41742ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4175c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 41763f6bcfbdSStefan Behrens } 41773f6bcfbdSStefan Behrens break; 41783f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41790b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 41803f6bcfbdSStefan Behrens ret = 0; 41813f6bcfbdSStefan Behrens break; 41823f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 418317d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 418497282031SAnand Jain ret = 0; 41853f6bcfbdSStefan Behrens break; 41863f6bcfbdSStefan Behrens default: 41873f6bcfbdSStefan Behrens ret = -EINVAL; 41883f6bcfbdSStefan Behrens break; 41893f6bcfbdSStefan Behrens } 41903f6bcfbdSStefan Behrens 4191d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 41923f6bcfbdSStefan Behrens ret = -EFAULT; 4193adfa97cbSIlya Dryomov out: 41943f6bcfbdSStefan Behrens kfree(p); 41953f6bcfbdSStefan Behrens return ret; 41963f6bcfbdSStefan Behrens } 41973f6bcfbdSStefan Behrens 4198d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4199d7728c96SJan Schmidt { 4200d7728c96SJan Schmidt int ret = 0; 4201d7728c96SJan Schmidt int i; 4202740c3d22SChris Mason u64 rel_ptr; 4203d7728c96SJan Schmidt int size; 4204806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4205d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4206d7728c96SJan Schmidt struct btrfs_path *path; 4207d7728c96SJan Schmidt 420882b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4209d7728c96SJan Schmidt return -EPERM; 4210d7728c96SJan Schmidt 4211d7728c96SJan Schmidt path = btrfs_alloc_path(); 4212d7728c96SJan Schmidt if (!path) { 4213d7728c96SJan Schmidt ret = -ENOMEM; 4214d7728c96SJan Schmidt goto out; 4215d7728c96SJan Schmidt } 4216d7728c96SJan Schmidt 4217d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4218d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4219d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4220d7728c96SJan Schmidt ipa = NULL; 4221d7728c96SJan Schmidt goto out; 4222d7728c96SJan Schmidt } 4223d7728c96SJan Schmidt 4224d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4225d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4226d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4227d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4228d7728c96SJan Schmidt ipath = NULL; 4229d7728c96SJan Schmidt goto out; 4230d7728c96SJan Schmidt } 4231d7728c96SJan Schmidt 4232d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4233d7728c96SJan Schmidt if (ret < 0) 4234d7728c96SJan Schmidt goto out; 4235d7728c96SJan Schmidt 4236d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4237745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4238745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4239740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4240d7728c96SJan Schmidt } 4241d7728c96SJan Schmidt 42428cf96b40SAnand Jain btrfs_free_path(path); 42438cf96b40SAnand Jain path = NULL; 4244718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4245718dc5faSOmar Sandoval ipath->fspath, size); 4246d7728c96SJan Schmidt if (ret) { 4247d7728c96SJan Schmidt ret = -EFAULT; 4248d7728c96SJan Schmidt goto out; 4249d7728c96SJan Schmidt } 4250d7728c96SJan Schmidt 4251d7728c96SJan Schmidt out: 4252d7728c96SJan Schmidt btrfs_free_path(path); 4253d7728c96SJan Schmidt free_ipath(ipath); 4254d7728c96SJan Schmidt kfree(ipa); 4255d7728c96SJan Schmidt 4256d7728c96SJan Schmidt return ret; 4257d7728c96SJan Schmidt } 4258d7728c96SJan Schmidt 42592ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4260d24a67b2SZygo Blaxell void __user *arg, int version) 4261d7728c96SJan Schmidt { 4262d7728c96SJan Schmidt int ret = 0; 4263d7728c96SJan Schmidt int size; 4264d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4265d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4266d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4267d24a67b2SZygo Blaxell bool ignore_offset; 4268d7728c96SJan Schmidt 4269d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4270d7728c96SJan Schmidt return -EPERM; 4271d7728c96SJan Schmidt 4272d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 42737b9ea627SShailendra Verma if (IS_ERR(loi)) 42747b9ea627SShailendra Verma return PTR_ERR(loi); 4275d7728c96SJan Schmidt 4276d24a67b2SZygo Blaxell if (version == 1) { 4277d24a67b2SZygo Blaxell ignore_offset = false; 4278b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4279d24a67b2SZygo Blaxell } else { 4280d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4281d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4282d24a67b2SZygo Blaxell ret = -EINVAL; 4283d24a67b2SZygo Blaxell goto out_loi; 4284d24a67b2SZygo Blaxell } 4285d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4286d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4287d24a67b2SZygo Blaxell ret = -EINVAL; 4288d24a67b2SZygo Blaxell goto out_loi; 4289d24a67b2SZygo Blaxell } 4290d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4291b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4292d24a67b2SZygo Blaxell } 4293d24a67b2SZygo Blaxell 4294418ffb9eSAnand Jain inodes = init_data_container(size); 4295418ffb9eSAnand Jain if (IS_ERR(inodes)) { 4296418ffb9eSAnand Jain ret = PTR_ERR(inodes); 4297418ffb9eSAnand Jain goto out_loi; 4298418ffb9eSAnand Jain } 4299418ffb9eSAnand Jain 4300d7728c96SJan Schmidt path = btrfs_alloc_path(); 4301d7728c96SJan Schmidt if (!path) { 4302d7728c96SJan Schmidt ret = -ENOMEM; 4303d7728c96SJan Schmidt goto out; 4304d7728c96SJan Schmidt } 43052ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4306e3059ec0SDavid Sterba inodes, ignore_offset); 4307418ffb9eSAnand Jain btrfs_free_path(path); 4308df031f07SLiu Bo if (ret == -EINVAL) 4309d7728c96SJan Schmidt ret = -ENOENT; 4310d7728c96SJan Schmidt if (ret < 0) 4311d7728c96SJan Schmidt goto out; 4312d7728c96SJan Schmidt 4313718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4314718dc5faSOmar Sandoval size); 4315d7728c96SJan Schmidt if (ret) 4316d7728c96SJan Schmidt ret = -EFAULT; 4317d7728c96SJan Schmidt 4318d7728c96SJan Schmidt out: 4319f54de068SDavid Sterba kvfree(inodes); 4320d24a67b2SZygo Blaxell out_loi: 4321d7728c96SJan Schmidt kfree(loi); 4322d7728c96SJan Schmidt 4323d7728c96SJan Schmidt return ret; 4324d7728c96SJan Schmidt } 4325d7728c96SJan Schmidt 4326008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4327c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4328c9e9f97bSIlya Dryomov { 4329c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4330c9e9f97bSIlya Dryomov 4331c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4332c9e9f97bSIlya Dryomov 43333009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4334837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4335837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4336837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4337a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4338a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4339837d5b6eSIlya Dryomov 4340c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4341c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4342c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 434319a39dceSIlya Dryomov 434419a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 434519a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 434619a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4347c9e9f97bSIlya Dryomov } 4348c9e9f97bSIlya Dryomov 43497fb10ed8SNikolay Borisov /** 43507fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 43517fb10ed8SNikolay Borisov * required. 43527fb10ed8SNikolay Borisov * 43537fb10ed8SNikolay Borisov * @fs_info: the filesystem 43547fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 43557fb10ed8SNikolay Borisov * is being resumed 43567fb10ed8SNikolay Borisov * 43577fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 43587fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 43597fb10ed8SNikolay Borisov */ 43607fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 43617fb10ed8SNikolay Borisov { 43627fb10ed8SNikolay Borisov int ret; 43637fb10ed8SNikolay Borisov 43647fb10ed8SNikolay Borisov /* 43657fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 43667fb10ed8SNikolay Borisov * (1) some other op is running 43677fb10ed8SNikolay Borisov * (2) balance is running 43687fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 43697fb10ed8SNikolay Borisov */ 43707fb10ed8SNikolay Borisov while (1) { 43717fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 43727fb10ed8SNikolay Borisov *excl_acquired = true; 43737fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 43747fb10ed8SNikolay Borisov return 0; 43757fb10ed8SNikolay Borisov } 43767fb10ed8SNikolay Borisov 43777fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 43787fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 43797fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 43807fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 43817fb10ed8SNikolay Borisov /* This is (2) */ 43827fb10ed8SNikolay Borisov ret = -EINPROGRESS; 43837fb10ed8SNikolay Borisov goto out_failure; 43847fb10ed8SNikolay Borisov 43857fb10ed8SNikolay Borisov } else { 43867fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 43877fb10ed8SNikolay Borisov /* 43887fb10ed8SNikolay Borisov * Lock released to allow other waiters to 43897fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 43907fb10ed8SNikolay Borisov */ 43917fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 43927fb10ed8SNikolay Borisov 43937fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 43947fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 43957fb10ed8SNikolay Borisov /* This is (3) */ 43967fb10ed8SNikolay Borisov *excl_acquired = false; 43977fb10ed8SNikolay Borisov return 0; 43987fb10ed8SNikolay Borisov } 43997fb10ed8SNikolay Borisov } 44007fb10ed8SNikolay Borisov } else { 44017fb10ed8SNikolay Borisov /* This is (1) */ 44027fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 44037fb10ed8SNikolay Borisov goto out_failure; 44047fb10ed8SNikolay Borisov } 44057fb10ed8SNikolay Borisov 44067fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 44077fb10ed8SNikolay Borisov } 44087fb10ed8SNikolay Borisov 44097fb10ed8SNikolay Borisov out_failure: 44107fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 44117fb10ed8SNikolay Borisov *excl_acquired = false; 44127fb10ed8SNikolay Borisov return ret; 44137fb10ed8SNikolay Borisov } 44147fb10ed8SNikolay Borisov 44159ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4416c9e9f97bSIlya Dryomov { 4417496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4418c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4419c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4420c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4421099aa972SNikolay Borisov bool need_unlock = true; 4422c9e9f97bSIlya Dryomov int ret; 4423c9e9f97bSIlya Dryomov 4424c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4425c9e9f97bSIlya Dryomov return -EPERM; 4426c9e9f97bSIlya Dryomov 4427e54bfa31SLiu Bo ret = mnt_want_write_file(file); 44289ba1f6e4SLiu Bo if (ret) 44299ba1f6e4SLiu Bo return ret; 44309ba1f6e4SLiu Bo 4431d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 4432d8645462SNikolay Borisov if (IS_ERR(bargs)) { 4433d8645462SNikolay Borisov ret = PTR_ERR(bargs); 4434d8645462SNikolay Borisov bargs = NULL; 4435d8645462SNikolay Borisov goto out; 4436d8645462SNikolay Borisov } 4437d8645462SNikolay Borisov 4438099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 4439099aa972SNikolay Borisov if (ret) 4440ed0fb78fSIlya Dryomov goto out; 4441ed0fb78fSIlya Dryomov 4442099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 4443099aa972SNikolay Borisov 4444de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4445de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4446de322263SIlya Dryomov ret = -ENOTCONN; 4447d8645462SNikolay Borisov goto out_unlock; 4448de322263SIlya Dryomov } 4449de322263SIlya Dryomov 4450de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4451de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4452de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4453de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4454efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 4455de322263SIlya Dryomov 4456de322263SIlya Dryomov goto do_balance; 4457de322263SIlya Dryomov } 4458c9e9f97bSIlya Dryomov 4459d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 4460d8645462SNikolay Borisov ret = -EINVAL; 4461d8645462SNikolay Borisov goto out_unlock; 4462c9e9f97bSIlya Dryomov } 4463c9e9f97bSIlya Dryomov 4464ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4465837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4466d8645462SNikolay Borisov goto out_unlock; 4467837d5b6eSIlya Dryomov } 4468837d5b6eSIlya Dryomov 44698d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4470c9e9f97bSIlya Dryomov if (!bctl) { 4471c9e9f97bSIlya Dryomov ret = -ENOMEM; 4472d8645462SNikolay Borisov goto out_unlock; 4473c9e9f97bSIlya Dryomov } 4474c9e9f97bSIlya Dryomov 4475c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4476c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4477c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4478c9e9f97bSIlya Dryomov 4479c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4480de322263SIlya Dryomov do_balance: 4481c9e9f97bSIlya Dryomov /* 4482c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4483c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4484c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4485c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4486c9e9f97bSIlya Dryomov */ 4487ed0fb78fSIlya Dryomov need_unlock = false; 4488ed0fb78fSIlya Dryomov 44896fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 44900f89abf5SChristian Engelmayer bctl = NULL; 4491ed0fb78fSIlya Dryomov 449239864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 4493c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4494c9e9f97bSIlya Dryomov ret = -EFAULT; 4495c9e9f97bSIlya Dryomov } 4496c9e9f97bSIlya Dryomov 44970f89abf5SChristian Engelmayer kfree(bctl); 4498ed0fb78fSIlya Dryomov out_unlock: 4499c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4500ed0fb78fSIlya Dryomov if (need_unlock) 4501c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4502ed0fb78fSIlya Dryomov out: 4503e54bfa31SLiu Bo mnt_drop_write_file(file); 4504d8645462SNikolay Borisov kfree(bargs); 4505c9e9f97bSIlya Dryomov return ret; 4506c9e9f97bSIlya Dryomov } 4507c9e9f97bSIlya Dryomov 45082ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4509837d5b6eSIlya Dryomov { 4510837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4511837d5b6eSIlya Dryomov return -EPERM; 4512837d5b6eSIlya Dryomov 4513837d5b6eSIlya Dryomov switch (cmd) { 4514837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 45150b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4516a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 45170b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4518837d5b6eSIlya Dryomov } 4519837d5b6eSIlya Dryomov 4520837d5b6eSIlya Dryomov return -EINVAL; 4521837d5b6eSIlya Dryomov } 4522837d5b6eSIlya Dryomov 45232ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 452419a39dceSIlya Dryomov void __user *arg) 452519a39dceSIlya Dryomov { 452619a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 452719a39dceSIlya Dryomov int ret = 0; 452819a39dceSIlya Dryomov 452919a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 453019a39dceSIlya Dryomov return -EPERM; 453119a39dceSIlya Dryomov 453219a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 453319a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 453419a39dceSIlya Dryomov ret = -ENOTCONN; 453519a39dceSIlya Dryomov goto out; 453619a39dceSIlya Dryomov } 453719a39dceSIlya Dryomov 45388d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 453919a39dceSIlya Dryomov if (!bargs) { 454019a39dceSIlya Dryomov ret = -ENOMEM; 454119a39dceSIlya Dryomov goto out; 454219a39dceSIlya Dryomov } 454319a39dceSIlya Dryomov 4544008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 454519a39dceSIlya Dryomov 454619a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 454719a39dceSIlya Dryomov ret = -EFAULT; 454819a39dceSIlya Dryomov 454919a39dceSIlya Dryomov kfree(bargs); 455019a39dceSIlya Dryomov out: 455119a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 455219a39dceSIlya Dryomov return ret; 455319a39dceSIlya Dryomov } 455419a39dceSIlya Dryomov 4555905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45565d13a37bSArne Jansen { 45570b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45580b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45595d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45605d13a37bSArne Jansen int ret; 45615d13a37bSArne Jansen 45625d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45635d13a37bSArne Jansen return -EPERM; 45645d13a37bSArne Jansen 4565905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4566905b0ddaSMiao Xie if (ret) 4567905b0ddaSMiao Xie return ret; 45685d13a37bSArne Jansen 45695d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4570905b0ddaSMiao Xie if (IS_ERR(sa)) { 4571905b0ddaSMiao Xie ret = PTR_ERR(sa); 4572905b0ddaSMiao Xie goto drop_write; 4573905b0ddaSMiao Xie } 45745d13a37bSArne Jansen 45750b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 45765d13a37bSArne Jansen 45775d13a37bSArne Jansen switch (sa->cmd) { 45785d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4579340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 45805d13a37bSArne Jansen break; 45815d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4582340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 45835d13a37bSArne Jansen break; 45845d13a37bSArne Jansen default: 45855d13a37bSArne Jansen ret = -EINVAL; 45865d13a37bSArne Jansen break; 45875d13a37bSArne Jansen } 45885d13a37bSArne Jansen 45895d13a37bSArne Jansen kfree(sa); 45900b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4591905b0ddaSMiao Xie drop_write: 4592905b0ddaSMiao Xie mnt_drop_write_file(file); 45935d13a37bSArne Jansen return ret; 45945d13a37bSArne Jansen } 45955d13a37bSArne Jansen 4596905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 45975d13a37bSArne Jansen { 45980b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46000b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46015d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 46025d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46035d13a37bSArne Jansen int ret; 46045d13a37bSArne Jansen int err; 46055d13a37bSArne Jansen 46065d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46075d13a37bSArne Jansen return -EPERM; 46085d13a37bSArne Jansen 4609905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4610905b0ddaSMiao Xie if (ret) 4611905b0ddaSMiao Xie return ret; 46125d13a37bSArne Jansen 46135d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4614905b0ddaSMiao Xie if (IS_ERR(sa)) { 4615905b0ddaSMiao Xie ret = PTR_ERR(sa); 4616905b0ddaSMiao Xie goto drop_write; 4617905b0ddaSMiao Xie } 46185d13a37bSArne Jansen 46195d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46205d13a37bSArne Jansen if (IS_ERR(trans)) { 46215d13a37bSArne Jansen ret = PTR_ERR(trans); 46225d13a37bSArne Jansen goto out; 46235d13a37bSArne Jansen } 46245d13a37bSArne Jansen 46255d13a37bSArne Jansen if (sa->assign) { 46269f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 46275d13a37bSArne Jansen } else { 462839616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 46295d13a37bSArne Jansen } 46305d13a37bSArne Jansen 4631e082f563SQu Wenruo /* update qgroup status and info */ 4632280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4633e082f563SQu Wenruo if (err < 0) 46340b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4635ad8403dfSAnand Jain "failed to update qgroup status and info"); 46363a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46375d13a37bSArne Jansen if (err && !ret) 46385d13a37bSArne Jansen ret = err; 46395d13a37bSArne Jansen 46405d13a37bSArne Jansen out: 46415d13a37bSArne Jansen kfree(sa); 4642905b0ddaSMiao Xie drop_write: 4643905b0ddaSMiao Xie mnt_drop_write_file(file); 46445d13a37bSArne Jansen return ret; 46455d13a37bSArne Jansen } 46465d13a37bSArne Jansen 4647905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46485d13a37bSArne Jansen { 46490b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46500b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46515d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46525d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46535d13a37bSArne Jansen int ret; 46545d13a37bSArne Jansen int err; 46555d13a37bSArne Jansen 46565d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46575d13a37bSArne Jansen return -EPERM; 46585d13a37bSArne Jansen 4659905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4660905b0ddaSMiao Xie if (ret) 4661905b0ddaSMiao Xie return ret; 46625d13a37bSArne Jansen 46635d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4664905b0ddaSMiao Xie if (IS_ERR(sa)) { 4665905b0ddaSMiao Xie ret = PTR_ERR(sa); 4666905b0ddaSMiao Xie goto drop_write; 4667905b0ddaSMiao Xie } 46685d13a37bSArne Jansen 4669d86e56cfSMiao Xie if (!sa->qgroupid) { 4670d86e56cfSMiao Xie ret = -EINVAL; 4671d86e56cfSMiao Xie goto out; 4672d86e56cfSMiao Xie } 4673d86e56cfSMiao Xie 46745d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46755d13a37bSArne Jansen if (IS_ERR(trans)) { 46765d13a37bSArne Jansen ret = PTR_ERR(trans); 46775d13a37bSArne Jansen goto out; 46785d13a37bSArne Jansen } 46795d13a37bSArne Jansen 46805d13a37bSArne Jansen if (sa->create) { 468149a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 46825d13a37bSArne Jansen } else { 46833efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 46845d13a37bSArne Jansen } 46855d13a37bSArne Jansen 46863a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46875d13a37bSArne Jansen if (err && !ret) 46885d13a37bSArne Jansen ret = err; 46895d13a37bSArne Jansen 46905d13a37bSArne Jansen out: 46915d13a37bSArne Jansen kfree(sa); 4692905b0ddaSMiao Xie drop_write: 4693905b0ddaSMiao Xie mnt_drop_write_file(file); 46945d13a37bSArne Jansen return ret; 46955d13a37bSArne Jansen } 46965d13a37bSArne Jansen 4697905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 46985d13a37bSArne Jansen { 46990b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47000b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47015d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 47025d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47035d13a37bSArne Jansen int ret; 47045d13a37bSArne Jansen int err; 47055d13a37bSArne Jansen u64 qgroupid; 47065d13a37bSArne Jansen 47075d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47085d13a37bSArne Jansen return -EPERM; 47095d13a37bSArne Jansen 4710905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4711905b0ddaSMiao Xie if (ret) 4712905b0ddaSMiao Xie return ret; 47135d13a37bSArne Jansen 47145d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4715905b0ddaSMiao Xie if (IS_ERR(sa)) { 4716905b0ddaSMiao Xie ret = PTR_ERR(sa); 4717905b0ddaSMiao Xie goto drop_write; 4718905b0ddaSMiao Xie } 47195d13a37bSArne Jansen 47205d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47215d13a37bSArne Jansen if (IS_ERR(trans)) { 47225d13a37bSArne Jansen ret = PTR_ERR(trans); 47235d13a37bSArne Jansen goto out; 47245d13a37bSArne Jansen } 47255d13a37bSArne Jansen 47265d13a37bSArne Jansen qgroupid = sa->qgroupid; 47275d13a37bSArne Jansen if (!qgroupid) { 47285d13a37bSArne Jansen /* take the current subvol as qgroup */ 47295d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47305d13a37bSArne Jansen } 47315d13a37bSArne Jansen 4732f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 47335d13a37bSArne Jansen 47343a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 47355d13a37bSArne Jansen if (err && !ret) 47365d13a37bSArne Jansen ret = err; 47375d13a37bSArne Jansen 47385d13a37bSArne Jansen out: 47395d13a37bSArne Jansen kfree(sa); 4740905b0ddaSMiao Xie drop_write: 4741905b0ddaSMiao Xie mnt_drop_write_file(file); 47425d13a37bSArne Jansen return ret; 47435d13a37bSArne Jansen } 47445d13a37bSArne Jansen 47452f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47462f232036SJan Schmidt { 47470b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47492f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47502f232036SJan Schmidt int ret; 47512f232036SJan Schmidt 47522f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47532f232036SJan Schmidt return -EPERM; 47542f232036SJan Schmidt 47552f232036SJan Schmidt ret = mnt_want_write_file(file); 47562f232036SJan Schmidt if (ret) 47572f232036SJan Schmidt return ret; 47582f232036SJan Schmidt 47592f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47602f232036SJan Schmidt if (IS_ERR(qsa)) { 47612f232036SJan Schmidt ret = PTR_ERR(qsa); 47622f232036SJan Schmidt goto drop_write; 47632f232036SJan Schmidt } 47642f232036SJan Schmidt 47652f232036SJan Schmidt if (qsa->flags) { 47662f232036SJan Schmidt ret = -EINVAL; 47672f232036SJan Schmidt goto out; 47682f232036SJan Schmidt } 47692f232036SJan Schmidt 47700b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 47712f232036SJan Schmidt 47722f232036SJan Schmidt out: 47732f232036SJan Schmidt kfree(qsa); 47742f232036SJan Schmidt drop_write: 47752f232036SJan Schmidt mnt_drop_write_file(file); 47762f232036SJan Schmidt return ret; 47772f232036SJan Schmidt } 47782f232036SJan Schmidt 4779b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4780b929c1d8SMarcos Paulo de Souza void __user *arg) 47812f232036SJan Schmidt { 47820afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 47832f232036SJan Schmidt 47842f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47852f232036SJan Schmidt return -EPERM; 47862f232036SJan Schmidt 47870b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 47880afb603aSGoldwyn Rodrigues qsa.flags = 1; 47890afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 47902f232036SJan Schmidt } 47912f232036SJan Schmidt 47920afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4793991a3daeSAnand Jain return -EFAULT; 47942f232036SJan Schmidt 4795991a3daeSAnand Jain return 0; 47962f232036SJan Schmidt } 47972f232036SJan Schmidt 4798b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4799b929c1d8SMarcos Paulo de Souza void __user *arg) 480057254b6eSJan Schmidt { 480157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 480257254b6eSJan Schmidt return -EPERM; 480357254b6eSJan Schmidt 48040b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 480557254b6eSJan Schmidt } 480657254b6eSJan Schmidt 4807abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4808e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4809abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48108ea05e3aSAlexander Block { 4811496ad9aaSAl Viro struct inode *inode = file_inode(file); 48120b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48138ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48148ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48158ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 481695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 48178ea05e3aSAlexander Block int ret = 0; 4818dd5f9615SStefan Behrens int received_uuid_changed; 48198ea05e3aSAlexander Block 4820e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4821bd60ea0fSDavid Sterba return -EPERM; 4822bd60ea0fSDavid Sterba 48238ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48248ea05e3aSAlexander Block if (ret < 0) 48258ea05e3aSAlexander Block return ret; 48268ea05e3aSAlexander Block 48270b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 48288ea05e3aSAlexander Block 48294a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 48308ea05e3aSAlexander Block ret = -EINVAL; 48318ea05e3aSAlexander Block goto out; 48328ea05e3aSAlexander Block } 48338ea05e3aSAlexander Block 48348ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48358ea05e3aSAlexander Block ret = -EROFS; 48368ea05e3aSAlexander Block goto out; 48378ea05e3aSAlexander Block } 48388ea05e3aSAlexander Block 4839dd5f9615SStefan Behrens /* 4840dd5f9615SStefan Behrens * 1 - root item 4841dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4842dd5f9615SStefan Behrens */ 4843dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48448ea05e3aSAlexander Block if (IS_ERR(trans)) { 48458ea05e3aSAlexander Block ret = PTR_ERR(trans); 48468ea05e3aSAlexander Block trans = NULL; 48478ea05e3aSAlexander Block goto out; 48488ea05e3aSAlexander Block } 48498ea05e3aSAlexander Block 48508ea05e3aSAlexander Block sa->rtransid = trans->transid; 48518ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48528ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48538ea05e3aSAlexander Block 4854dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4855dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4856dd5f9615SStefan Behrens if (received_uuid_changed && 4857d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4858d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4859dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4860dd5f9615SStefan Behrens root->root_key.objectid); 4861d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4862d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4863d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4864d87ff758SNikolay Borisov goto out; 4865d87ff758SNikolay Borisov } 4866d87ff758SNikolay Borisov } 48678ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48688ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48698ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48703cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48713cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48723cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48733cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48748ea05e3aSAlexander Block 48750b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 48768ea05e3aSAlexander Block &root->root_key, &root->root_item); 48778ea05e3aSAlexander Block if (ret < 0) { 48783a45bb20SJeff Mahoney btrfs_end_transaction(trans); 48798ea05e3aSAlexander Block goto out; 4880dd5f9615SStefan Behrens } 4881dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4882cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4883dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4884dd5f9615SStefan Behrens root->root_key.objectid); 4885dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 488666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4887efd38150SNikolay Borisov btrfs_end_transaction(trans); 4888dd5f9615SStefan Behrens goto out; 4889dd5f9615SStefan Behrens } 4890dd5f9615SStefan Behrens } 48913a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4892abccd00fSHugo Mills out: 48930b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4894abccd00fSHugo Mills mnt_drop_write_file(file); 4895abccd00fSHugo Mills return ret; 4896abccd00fSHugo Mills } 4897abccd00fSHugo Mills 4898abccd00fSHugo Mills #ifdef CONFIG_64BIT 4899abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4900abccd00fSHugo Mills void __user *arg) 4901abccd00fSHugo Mills { 4902abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4903abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4904abccd00fSHugo Mills int ret = 0; 4905abccd00fSHugo Mills 4906abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 49077b9ea627SShailendra Verma if (IS_ERR(args32)) 49087b9ea627SShailendra Verma return PTR_ERR(args32); 4909abccd00fSHugo Mills 49108d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 491184dbeb87SDan Carpenter if (!args64) { 491284dbeb87SDan Carpenter ret = -ENOMEM; 4913abccd00fSHugo Mills goto out; 4914abccd00fSHugo Mills } 4915abccd00fSHugo Mills 4916abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4917abccd00fSHugo Mills args64->stransid = args32->stransid; 4918abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4919abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4920abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4921abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4922abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4923abccd00fSHugo Mills args64->flags = args32->flags; 4924abccd00fSHugo Mills 4925e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4926abccd00fSHugo Mills if (ret) 4927abccd00fSHugo Mills goto out; 4928abccd00fSHugo Mills 4929abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4930abccd00fSHugo Mills args32->stransid = args64->stransid; 4931abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4932abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4933abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4934abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4935abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4936abccd00fSHugo Mills args32->flags = args64->flags; 4937abccd00fSHugo Mills 4938abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4939abccd00fSHugo Mills if (ret) 4940abccd00fSHugo Mills ret = -EFAULT; 4941abccd00fSHugo Mills 4942abccd00fSHugo Mills out: 4943abccd00fSHugo Mills kfree(args32); 4944abccd00fSHugo Mills kfree(args64); 4945abccd00fSHugo Mills return ret; 4946abccd00fSHugo Mills } 4947abccd00fSHugo Mills #endif 4948abccd00fSHugo Mills 4949abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4950abccd00fSHugo Mills void __user *arg) 4951abccd00fSHugo Mills { 4952abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4953abccd00fSHugo Mills int ret = 0; 4954abccd00fSHugo Mills 4955abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 49567b9ea627SShailendra Verma if (IS_ERR(sa)) 49577b9ea627SShailendra Verma return PTR_ERR(sa); 4958abccd00fSHugo Mills 4959e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4960abccd00fSHugo Mills 4961abccd00fSHugo Mills if (ret) 4962abccd00fSHugo Mills goto out; 4963abccd00fSHugo Mills 49648ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49658ea05e3aSAlexander Block if (ret) 49668ea05e3aSAlexander Block ret = -EFAULT; 49678ea05e3aSAlexander Block 49688ea05e3aSAlexander Block out: 49698ea05e3aSAlexander Block kfree(sa); 49708ea05e3aSAlexander Block return ret; 49718ea05e3aSAlexander Block } 49728ea05e3aSAlexander Block 4973b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4974b929c1d8SMarcos Paulo de Souza void __user *arg) 4975867ab667Sjeff.liu { 4976a1b83ac5SAnand Jain size_t len; 4977867ab667Sjeff.liu int ret; 4978a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4979a1b83ac5SAnand Jain 49800b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 49810b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 49820b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4983a1b83ac5SAnand Jain 4984a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4985867ab667Sjeff.liu 4986867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 49870b246afaSJeff Mahoney btrfs_warn(fs_info, 49880b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 49890b246afaSJeff Mahoney --len); 4990867ab667Sjeff.liu } 4991867ab667Sjeff.liu 4992867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4993867ab667Sjeff.liu 4994867ab667Sjeff.liu return ret ? -EFAULT : 0; 4995867ab667Sjeff.liu } 4996867ab667Sjeff.liu 4997a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4998a8bfd4abSjeff.liu { 49990b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 50010b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 50020b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 5003a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5004a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5005a8bfd4abSjeff.liu int ret; 5006a8bfd4abSjeff.liu 5007a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5008a8bfd4abSjeff.liu return -EPERM; 5009a8bfd4abSjeff.liu 5010a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5011a8bfd4abSjeff.liu return -EFAULT; 5012a8bfd4abSjeff.liu 5013a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 50140b246afaSJeff Mahoney btrfs_err(fs_info, 50155d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 5016a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5017a8bfd4abSjeff.liu return -EINVAL; 5018a8bfd4abSjeff.liu } 5019a8bfd4abSjeff.liu 5020a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5021a8bfd4abSjeff.liu if (ret) 5022a8bfd4abSjeff.liu return ret; 5023a8bfd4abSjeff.liu 5024a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5025a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5026a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5027a8bfd4abSjeff.liu goto out_unlock; 5028a8bfd4abSjeff.liu } 5029a8bfd4abSjeff.liu 50300b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 5031a8bfd4abSjeff.liu strcpy(super_block->label, label); 50320b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50333a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5034a8bfd4abSjeff.liu 5035a8bfd4abSjeff.liu out_unlock: 5036a8bfd4abSjeff.liu mnt_drop_write_file(file); 5037a8bfd4abSjeff.liu return ret; 5038a8bfd4abSjeff.liu } 5039a8bfd4abSjeff.liu 50402eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50412eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50422eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50432eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50442eaa055fSJeff Mahoney 5045d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 50462eaa055fSJeff Mahoney { 50474d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 50482eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50492eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50502eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50512eaa055fSJeff Mahoney }; 50522eaa055fSJeff Mahoney 50532eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50542eaa055fSJeff Mahoney return -EFAULT; 50552eaa055fSJeff Mahoney 50562eaa055fSJeff Mahoney return 0; 50572eaa055fSJeff Mahoney } 50582eaa055fSJeff Mahoney 5059b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 5060b929c1d8SMarcos Paulo de Souza void __user *arg) 50612eaa055fSJeff Mahoney { 50620b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 50632eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50642eaa055fSJeff Mahoney 50652eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50662eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50672eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50682eaa055fSJeff Mahoney 50692eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50702eaa055fSJeff Mahoney return -EFAULT; 50712eaa055fSJeff Mahoney 50722eaa055fSJeff Mahoney return 0; 50732eaa055fSJeff Mahoney } 50742eaa055fSJeff Mahoney 50752ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 50763b02a68aSJeff Mahoney enum btrfs_feature_set set, 50772eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50782eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50792eaa055fSJeff Mahoney { 5080f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 50813b02a68aSJeff Mahoney char *names; 50822eaa055fSJeff Mahoney u64 disallowed, unsupported; 50832eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 50842eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 50852eaa055fSJeff Mahoney 50862eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 50872eaa055fSJeff Mahoney if (unsupported) { 50883b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 50893b02a68aSJeff Mahoney if (names) { 50900b246afaSJeff Mahoney btrfs_warn(fs_info, 50913b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 50923b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50933b02a68aSJeff Mahoney kfree(names); 50943b02a68aSJeff Mahoney } else 50950b246afaSJeff Mahoney btrfs_warn(fs_info, 50962eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 50972eaa055fSJeff Mahoney type, unsupported); 50982eaa055fSJeff Mahoney return -EOPNOTSUPP; 50992eaa055fSJeff Mahoney } 51002eaa055fSJeff Mahoney 51012eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 51022eaa055fSJeff Mahoney if (disallowed) { 51033b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51043b02a68aSJeff Mahoney if (names) { 51050b246afaSJeff Mahoney btrfs_warn(fs_info, 51063b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51073b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51083b02a68aSJeff Mahoney kfree(names); 51093b02a68aSJeff Mahoney } else 51100b246afaSJeff Mahoney btrfs_warn(fs_info, 51112eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51122eaa055fSJeff Mahoney type, disallowed); 51132eaa055fSJeff Mahoney return -EPERM; 51142eaa055fSJeff Mahoney } 51152eaa055fSJeff Mahoney 51162eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51172eaa055fSJeff Mahoney if (disallowed) { 51183b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51193b02a68aSJeff Mahoney if (names) { 51200b246afaSJeff Mahoney btrfs_warn(fs_info, 51213b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51223b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51233b02a68aSJeff Mahoney kfree(names); 51243b02a68aSJeff Mahoney } else 51250b246afaSJeff Mahoney btrfs_warn(fs_info, 51262eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51272eaa055fSJeff Mahoney type, disallowed); 51282eaa055fSJeff Mahoney return -EPERM; 51292eaa055fSJeff Mahoney } 51302eaa055fSJeff Mahoney 51312eaa055fSJeff Mahoney return 0; 51322eaa055fSJeff Mahoney } 51332eaa055fSJeff Mahoney 51342ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 51352ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 51362eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51372eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51382eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51392eaa055fSJeff Mahoney 51402eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51412eaa055fSJeff Mahoney { 51420b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51430b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51440b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 51450b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 51462eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51472eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51482eaa055fSJeff Mahoney u64 newflags; 51492eaa055fSJeff Mahoney int ret; 51502eaa055fSJeff Mahoney 51512eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51522eaa055fSJeff Mahoney return -EPERM; 51532eaa055fSJeff Mahoney 51542eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51552eaa055fSJeff Mahoney return -EFAULT; 51562eaa055fSJeff Mahoney 51572eaa055fSJeff Mahoney /* Nothing to do */ 51582eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51592eaa055fSJeff Mahoney !flags[0].incompat_flags) 51602eaa055fSJeff Mahoney return 0; 51612eaa055fSJeff Mahoney 51622ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 51632eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51642eaa055fSJeff Mahoney if (ret) 51652eaa055fSJeff Mahoney return ret; 51662eaa055fSJeff Mahoney 51672ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 51682eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51692eaa055fSJeff Mahoney if (ret) 51702eaa055fSJeff Mahoney return ret; 51712eaa055fSJeff Mahoney 51722ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 51732eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51742eaa055fSJeff Mahoney if (ret) 51752eaa055fSJeff Mahoney return ret; 51762eaa055fSJeff Mahoney 51777ab19625SDavid Sterba ret = mnt_want_write_file(file); 51787ab19625SDavid Sterba if (ret) 51797ab19625SDavid Sterba return ret; 51807ab19625SDavid Sterba 51818051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51827ab19625SDavid Sterba if (IS_ERR(trans)) { 51837ab19625SDavid Sterba ret = PTR_ERR(trans); 51847ab19625SDavid Sterba goto out_drop_write; 51857ab19625SDavid Sterba } 51862eaa055fSJeff Mahoney 51870b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 51882eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51892eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51902eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51912eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 51922eaa055fSJeff Mahoney 51932eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 51942eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 51952eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 51962eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 51972eaa055fSJeff Mahoney 51982eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 51992eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 52002eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 52012eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 52020b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 52032eaa055fSJeff Mahoney 52043a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 52057ab19625SDavid Sterba out_drop_write: 52067ab19625SDavid Sterba mnt_drop_write_file(file); 52077ab19625SDavid Sterba 52087ab19625SDavid Sterba return ret; 52092eaa055fSJeff Mahoney } 52102eaa055fSJeff Mahoney 52119ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 52122351f431SJosef Bacik { 52132351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 52142351f431SJosef Bacik int ret; 52152351f431SJosef Bacik 52162351f431SJosef Bacik if (compat) { 52172351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52182351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 52192351f431SJosef Bacik 52202351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 52212351f431SJosef Bacik if (ret) 52222351f431SJosef Bacik return -EFAULT; 52232351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 52242351f431SJosef Bacik if (!arg) 52252351f431SJosef Bacik return -ENOMEM; 52262351f431SJosef Bacik arg->send_fd = args32.send_fd; 52272351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 52282351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 52292351f431SJosef Bacik arg->parent_root = args32.parent_root; 52302351f431SJosef Bacik arg->flags = args32.flags; 52312351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 52322351f431SJosef Bacik sizeof(args32.reserved)); 52332351f431SJosef Bacik #else 52342351f431SJosef Bacik return -ENOTTY; 52352351f431SJosef Bacik #endif 52362351f431SJosef Bacik } else { 52372351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 52382351f431SJosef Bacik if (IS_ERR(arg)) 52392351f431SJosef Bacik return PTR_ERR(arg); 52402351f431SJosef Bacik } 52419ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 52422351f431SJosef Bacik kfree(arg); 52432351f431SJosef Bacik return ret; 52442351f431SJosef Bacik } 52452351f431SJosef Bacik 52461881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 52471881fba8SOmar Sandoval bool compat) 52481881fba8SOmar Sandoval { 52491881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 52501881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 52511881fba8SOmar Sandoval flags); 52521881fba8SOmar Sandoval size_t copy_end; 52531881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 52541881fba8SOmar Sandoval struct iovec *iov = iovstack; 52551881fba8SOmar Sandoval struct iov_iter iter; 52561881fba8SOmar Sandoval loff_t pos; 52571881fba8SOmar Sandoval struct kiocb kiocb; 52581881fba8SOmar Sandoval ssize_t ret; 52591881fba8SOmar Sandoval 52601881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 52611881fba8SOmar Sandoval ret = -EPERM; 52621881fba8SOmar Sandoval goto out_acct; 52631881fba8SOmar Sandoval } 52641881fba8SOmar Sandoval 52651881fba8SOmar Sandoval if (compat) { 52661881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52671881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 52681881fba8SOmar Sandoval 52691881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 52701881fba8SOmar Sandoval flags); 52711881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 52721881fba8SOmar Sandoval ret = -EFAULT; 52731881fba8SOmar Sandoval goto out_acct; 52741881fba8SOmar Sandoval } 52751881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 52761881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 52771881fba8SOmar Sandoval args.offset = args32.offset; 52781881fba8SOmar Sandoval args.flags = args32.flags; 52791881fba8SOmar Sandoval #else 52801881fba8SOmar Sandoval return -ENOTTY; 52811881fba8SOmar Sandoval #endif 52821881fba8SOmar Sandoval } else { 52831881fba8SOmar Sandoval copy_end = copy_end_kernel; 52841881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 52851881fba8SOmar Sandoval ret = -EFAULT; 52861881fba8SOmar Sandoval goto out_acct; 52871881fba8SOmar Sandoval } 52881881fba8SOmar Sandoval } 52891881fba8SOmar Sandoval if (args.flags != 0) { 52901881fba8SOmar Sandoval ret = -EINVAL; 52911881fba8SOmar Sandoval goto out_acct; 52921881fba8SOmar Sandoval } 52931881fba8SOmar Sandoval 52941881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 52951881fba8SOmar Sandoval &iov, &iter); 52961881fba8SOmar Sandoval if (ret < 0) 52971881fba8SOmar Sandoval goto out_acct; 52981881fba8SOmar Sandoval 52991881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 53001881fba8SOmar Sandoval ret = 0; 53011881fba8SOmar Sandoval goto out_iov; 53021881fba8SOmar Sandoval } 53031881fba8SOmar Sandoval pos = args.offset; 53041881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 53051881fba8SOmar Sandoval if (ret < 0) 53061881fba8SOmar Sandoval goto out_iov; 53071881fba8SOmar Sandoval 53081881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 53091881fba8SOmar Sandoval kiocb.ki_pos = pos; 53101881fba8SOmar Sandoval 53111881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 53121881fba8SOmar Sandoval if (ret >= 0) { 53131881fba8SOmar Sandoval fsnotify_access(file); 53141881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 53151881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 53161881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 53171881fba8SOmar Sandoval ret = -EFAULT; 53181881fba8SOmar Sandoval } 53191881fba8SOmar Sandoval 53201881fba8SOmar Sandoval out_iov: 53211881fba8SOmar Sandoval kfree(iov); 53221881fba8SOmar Sandoval out_acct: 53231881fba8SOmar Sandoval if (ret > 0) 53241881fba8SOmar Sandoval add_rchar(current, ret); 53251881fba8SOmar Sandoval inc_syscr(current); 53261881fba8SOmar Sandoval return ret; 53271881fba8SOmar Sandoval } 53281881fba8SOmar Sandoval 53297c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 53307c0c7269SOmar Sandoval { 53317c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 53327c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 53337c0c7269SOmar Sandoval struct iovec *iov = iovstack; 53347c0c7269SOmar Sandoval struct iov_iter iter; 53357c0c7269SOmar Sandoval loff_t pos; 53367c0c7269SOmar Sandoval struct kiocb kiocb; 53377c0c7269SOmar Sandoval ssize_t ret; 53387c0c7269SOmar Sandoval 53397c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 53407c0c7269SOmar Sandoval ret = -EPERM; 53417c0c7269SOmar Sandoval goto out_acct; 53427c0c7269SOmar Sandoval } 53437c0c7269SOmar Sandoval 53447c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 53457c0c7269SOmar Sandoval ret = -EBADF; 53467c0c7269SOmar Sandoval goto out_acct; 53477c0c7269SOmar Sandoval } 53487c0c7269SOmar Sandoval 53497c0c7269SOmar Sandoval if (compat) { 53507c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 53517c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 53527c0c7269SOmar Sandoval 53537c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 53547c0c7269SOmar Sandoval ret = -EFAULT; 53557c0c7269SOmar Sandoval goto out_acct; 53567c0c7269SOmar Sandoval } 53577c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 53587c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 53597c0c7269SOmar Sandoval args.offset = args32.offset; 53607c0c7269SOmar Sandoval args.flags = args32.flags; 53617c0c7269SOmar Sandoval args.len = args32.len; 53627c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 53637c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 53647c0c7269SOmar Sandoval args.compression = args32.compression; 53657c0c7269SOmar Sandoval args.encryption = args32.encryption; 53667c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 53677c0c7269SOmar Sandoval #else 53687c0c7269SOmar Sandoval return -ENOTTY; 53697c0c7269SOmar Sandoval #endif 53707c0c7269SOmar Sandoval } else { 53717c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 53727c0c7269SOmar Sandoval ret = -EFAULT; 53737c0c7269SOmar Sandoval goto out_acct; 53747c0c7269SOmar Sandoval } 53757c0c7269SOmar Sandoval } 53767c0c7269SOmar Sandoval 53777c0c7269SOmar Sandoval ret = -EINVAL; 53787c0c7269SOmar Sandoval if (args.flags != 0) 53797c0c7269SOmar Sandoval goto out_acct; 53807c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 53817c0c7269SOmar Sandoval goto out_acct; 53827c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 53837c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 53847c0c7269SOmar Sandoval goto out_acct; 53857c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 53867c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 53877c0c7269SOmar Sandoval goto out_acct; 53887c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 53897c0c7269SOmar Sandoval goto out_acct; 53907c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 53917c0c7269SOmar Sandoval goto out_acct; 53927c0c7269SOmar Sandoval 53937c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 53947c0c7269SOmar Sandoval &iov, &iter); 53957c0c7269SOmar Sandoval if (ret < 0) 53967c0c7269SOmar Sandoval goto out_acct; 53977c0c7269SOmar Sandoval 53987c0c7269SOmar Sandoval file_start_write(file); 53997c0c7269SOmar Sandoval 54007c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 54017c0c7269SOmar Sandoval ret = 0; 54027c0c7269SOmar Sandoval goto out_end_write; 54037c0c7269SOmar Sandoval } 54047c0c7269SOmar Sandoval pos = args.offset; 54057c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 54067c0c7269SOmar Sandoval if (ret < 0) 54077c0c7269SOmar Sandoval goto out_end_write; 54087c0c7269SOmar Sandoval 54097c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 54107c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 54117c0c7269SOmar Sandoval if (ret) 54127c0c7269SOmar Sandoval goto out_end_write; 54137c0c7269SOmar Sandoval kiocb.ki_pos = pos; 54147c0c7269SOmar Sandoval 54157c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 54167c0c7269SOmar Sandoval if (ret > 0) 54177c0c7269SOmar Sandoval fsnotify_modify(file); 54187c0c7269SOmar Sandoval 54197c0c7269SOmar Sandoval out_end_write: 54207c0c7269SOmar Sandoval file_end_write(file); 54217c0c7269SOmar Sandoval kfree(iov); 54227c0c7269SOmar Sandoval out_acct: 54237c0c7269SOmar Sandoval if (ret > 0) 54247c0c7269SOmar Sandoval add_wchar(current, ret); 54257c0c7269SOmar Sandoval inc_syscw(current); 54267c0c7269SOmar Sandoval return ret; 54277c0c7269SOmar Sandoval } 54287c0c7269SOmar Sandoval 5429f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5430f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5431f46b5a66SChristoph Hellwig { 54320b246afaSJeff Mahoney struct inode *inode = file_inode(file); 54330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 54340b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 54354bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5436f46b5a66SChristoph Hellwig 5437f46b5a66SChristoph Hellwig switch (cmd) { 54386cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 5439dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 544040cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5441b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 544240cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 544340cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5444f7039b1dSLi Dongyang case FITRIM: 5445b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5446f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5447fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5448fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5449fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 54503de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5451fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 54526f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 54536f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 545476dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5455949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5456949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5457949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 54580caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 54599ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 54600caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 54610caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 54626ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 54636ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5464f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 54651e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 54661e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 54671e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5468f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5469198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5470f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 54712ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5472f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5473da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 54746b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 54756b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5476475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 54772ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5478475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 54792ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5480ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 54819ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 5482cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 54839ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 5484ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5485dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 5486d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5487d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5488d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5489d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5490d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5491d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 54921406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 54932ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 54949b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 54959b199859SFilipe David Borba Manana int ret; 54969b199859SFilipe David Borba Manana 54979db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 54989b199859SFilipe David Borba Manana if (ret) 54999b199859SFilipe David Borba Manana return ret; 55000b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 55012fad4e83SDavid Sterba /* 55022fad4e83SDavid Sterba * The transaction thread may want to do more work, 550301327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 55042fad4e83SDavid Sterba * processing uncleaned subvols. 55052fad4e83SDavid Sterba */ 55060b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 55079b199859SFilipe David Borba Manana return ret; 55089b199859SFilipe David Borba Manana } 550946204592SSage Weil case BTRFS_IOC_START_SYNC: 55109a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 551146204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 55122ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5513475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5514b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5515475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 55162ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5517475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 55182ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5519c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 55209ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5521837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 55222ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 552319a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 55242ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 55258ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 55268ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5527abccd00fSHugo Mills #ifdef CONFIG_64BIT 5528abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5529abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5530abccd00fSHugo Mills #endif 553131db9f7cSAlexander Block case BTRFS_IOC_SEND: 55329ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 55332351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55342351f431SJosef Bacik case BTRFS_IOC_SEND_32: 55359ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 55362351f431SJosef Bacik #endif 5537c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 55382ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 55395d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5540905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55415d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5542905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55435d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5544905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55455d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5546905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55472f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55482f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55492f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5550b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 555157254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5552b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 55533f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 55542ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 55552eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5556d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 55572eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5558b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 55592eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 55602eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5561b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 55629ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 556342e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 5564dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 556523d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 556623d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 556714605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 556814605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 556914605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 557014605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 55711881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 55721881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 55737c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 55747c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 55751881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55761881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 55771881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 55787c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 55797c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 55801881fba8SOmar Sandoval #endif 5581f46b5a66SChristoph Hellwig } 5582f46b5a66SChristoph Hellwig 5583f46b5a66SChristoph Hellwig return -ENOTTY; 5584f46b5a66SChristoph Hellwig } 55854c63c245SLuke Dashjr 55864c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 55874c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 55884c63c245SLuke Dashjr { 55892a362249SJeff Mahoney /* 55902a362249SJeff Mahoney * These all access 32-bit values anyway so no further 55912a362249SJeff Mahoney * handling is necessary. 55922a362249SJeff Mahoney */ 55934c63c245SLuke Dashjr switch (cmd) { 55944c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 55954c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 55964c63c245SLuke Dashjr break; 55974c63c245SLuke Dashjr } 55984c63c245SLuke Dashjr 55994c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 56004c63c245SLuke Dashjr } 56014c63c245SLuke Dashjr #endif 5602