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" 54*07e81dc9SJosef Bacik #include "accessors.h" 55f46b5a66SChristoph Hellwig 56abccd00fSHugo Mills #ifdef CONFIG_64BIT 57abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 58abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 59abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 60abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 61abccd00fSHugo Mills */ 62abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 63abccd00fSHugo Mills __u64 sec; 64abccd00fSHugo Mills __u32 nsec; 65abccd00fSHugo Mills } __attribute__ ((__packed__)); 66abccd00fSHugo Mills 67abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 68abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 69abccd00fSHugo Mills __u64 stransid; /* in */ 70abccd00fSHugo Mills __u64 rtransid; /* out */ 71abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 72abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 73abccd00fSHugo Mills __u64 flags; /* in */ 74abccd00fSHugo Mills __u64 reserved[16]; /* in */ 75abccd00fSHugo Mills } __attribute__ ((__packed__)); 76abccd00fSHugo Mills 77abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 78abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 79abccd00fSHugo Mills #endif 80abccd00fSHugo Mills 812351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 822351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 832351f431SJosef Bacik __s64 send_fd; /* in */ 842351f431SJosef Bacik __u64 clone_sources_count; /* in */ 852351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 862351f431SJosef Bacik __u64 parent_root; /* in */ 872351f431SJosef Bacik __u64 flags; /* in */ 88e77fbf99SDavid Sterba __u32 version; /* in */ 89e77fbf99SDavid Sterba __u8 reserved[28]; /* in */ 902351f431SJosef Bacik } __attribute__ ((__packed__)); 912351f431SJosef Bacik 922351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 932351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 941881fba8SOmar Sandoval 951881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 { 961881fba8SOmar Sandoval compat_uptr_t iov; 971881fba8SOmar Sandoval compat_ulong_t iovcnt; 981881fba8SOmar Sandoval __s64 offset; 991881fba8SOmar Sandoval __u64 flags; 1001881fba8SOmar Sandoval __u64 len; 1011881fba8SOmar Sandoval __u64 unencoded_len; 1021881fba8SOmar Sandoval __u64 unencoded_offset; 1031881fba8SOmar Sandoval __u32 compression; 1041881fba8SOmar Sandoval __u32 encryption; 1051881fba8SOmar Sandoval __u8 reserved[64]; 1061881fba8SOmar Sandoval }; 1071881fba8SOmar Sandoval 1081881fba8SOmar Sandoval #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ 1091881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1107c0c7269SOmar Sandoval #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ 1117c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32) 1122351f431SJosef Bacik #endif 113abccd00fSHugo Mills 1146cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 1151905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 1161905a0f7SDavid Sterba unsigned int flags) 1176cbff00fSChristoph Hellwig { 1181905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 1196cbff00fSChristoph Hellwig return flags; 1201905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 1216cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 1226cbff00fSChristoph Hellwig else 1236cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1246cbff00fSChristoph Hellwig } 125f46b5a66SChristoph Hellwig 1266cbff00fSChristoph Hellwig /* 127a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 128a157d4fdSDavid Sterba * ioctl. 1296cbff00fSChristoph Hellwig */ 13077eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1316cbff00fSChristoph Hellwig { 1326cbff00fSChristoph Hellwig unsigned int iflags = 0; 13377eea05eSBoris Burkov u32 flags = binode->flags; 13414605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1356cbff00fSChristoph Hellwig 1366cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1376cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1386cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1396cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1406cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1416cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1426cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1436cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1446cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1456cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1466cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1476cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 148d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 149d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 15014605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 15114605409SBoris Burkov iflags |= FS_VERITY_FL; 152d0092bddSLi Zefan 15313f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 154d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 15513f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 15613f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1576cbff00fSChristoph Hellwig 1586cbff00fSChristoph Hellwig return iflags; 1596cbff00fSChristoph Hellwig } 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig /* 1626cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1636cbff00fSChristoph Hellwig */ 1647b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1656cbff00fSChristoph Hellwig { 1665c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1673cc79392SFilipe Manana unsigned int new_fl = 0; 1686cbff00fSChristoph Hellwig 1695c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1703cc79392SFilipe Manana new_fl |= S_SYNC; 1715c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1723cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1735c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1743cc79392SFilipe Manana new_fl |= S_APPEND; 1755c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1763cc79392SFilipe Manana new_fl |= S_NOATIME; 1775c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1783cc79392SFilipe Manana new_fl |= S_DIRSYNC; 17914605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 18014605409SBoris Burkov new_fl |= S_VERITY; 1813cc79392SFilipe Manana 1823cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 18314605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 18414605409SBoris Burkov S_VERITY, new_fl); 1856cbff00fSChristoph Hellwig } 1866cbff00fSChristoph Hellwig 187f37c563bSDavid Sterba /* 188f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 189f37c563bSDavid Sterba * the old and new flags are not conflicting 190f37c563bSDavid Sterba */ 191f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 19275e7cb7fSLiu Bo { 19375e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 19475e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 19575e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 196e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 197e1e8fb6aSLi Zefan FS_NOCOW_FL)) 19875e7cb7fSLiu Bo return -EOPNOTSUPP; 19975e7cb7fSLiu Bo 200f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 20175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 20275e7cb7fSLiu Bo return -EINVAL; 20375e7cb7fSLiu Bo 204f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 205f37c563bSDavid Sterba return -EINVAL; 206f37c563bSDavid Sterba 207f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 208f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 209f37c563bSDavid Sterba return -EINVAL; 210f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 211f37c563bSDavid Sterba return -EINVAL; 212f37c563bSDavid Sterba 21375e7cb7fSLiu Bo return 0; 21475e7cb7fSLiu Bo } 21575e7cb7fSLiu Bo 216d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 217d206e9c9SNaohiro Aota unsigned int flags) 218d206e9c9SNaohiro Aota { 219d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 220d206e9c9SNaohiro Aota return -EPERM; 221d206e9c9SNaohiro Aota 222d206e9c9SNaohiro Aota return 0; 223d206e9c9SNaohiro Aota } 224d206e9c9SNaohiro Aota 22597fc2977SMiklos Szeredi /* 22697fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 22797fc2977SMiklos Szeredi * fsxattr are zeroed. 22897fc2977SMiklos Szeredi */ 22997fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2306cbff00fSChristoph Hellwig { 23197fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 23297fc2977SMiklos Szeredi 23377eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 23497fc2977SMiklos Szeredi return 0; 23597fc2977SMiklos Szeredi } 23697fc2977SMiklos Szeredi 23797fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 23897fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 23997fc2977SMiklos Szeredi { 24097fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2410b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2425c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2435c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2446cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2455aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2466cbff00fSChristoph Hellwig int ret; 247ff9fef55SAnand Jain const char *comp = NULL; 248f37c563bSDavid Sterba u32 binode_flags; 2496cbff00fSChristoph Hellwig 250b83cc969SLi Zefan if (btrfs_root_readonly(root)) 251b83cc969SLi Zefan return -EROFS; 252b83cc969SLi Zefan 25397fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 25497fc2977SMiklos Szeredi return -EOPNOTSUPP; 2556cbff00fSChristoph Hellwig 25697fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 25777eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 25897fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 259e7848683SJan Kara if (ret) 260e7848683SJan Kara return ret; 261e7848683SJan Kara 262d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 263d206e9c9SNaohiro Aota if (ret) 26497fc2977SMiklos Szeredi return ret; 265d206e9c9SNaohiro Aota 266f37c563bSDavid Sterba binode_flags = binode->flags; 2675c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 268d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2696cbff00fSChristoph Hellwig else 270d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2715c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 272d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2736cbff00fSChristoph Hellwig else 274d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2755c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 276d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2776cbff00fSChristoph Hellwig else 278d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2795c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 280d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2816cbff00fSChristoph Hellwig else 282d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2835c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 284d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2856cbff00fSChristoph Hellwig else 286d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 28797fc2977SMiklos Szeredi 28897fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 28997fc2977SMiklos Szeredi if (!fa->flags_valid) { 29097fc2977SMiklos Szeredi /* 1 item for the inode */ 29197fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2929b8a233bSRitesh Harjani if (IS_ERR(trans)) 2939b8a233bSRitesh Harjani return PTR_ERR(trans); 29497fc2977SMiklos Szeredi goto update_flags; 29597fc2977SMiklos Szeredi } 29697fc2977SMiklos Szeredi 2975c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 298d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2996cbff00fSChristoph Hellwig else 300d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 3015c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 30244e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3037e97b8daSDavid Sterba /* 3047e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 3057e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 3067e97b8daSDavid Sterba * status of the file and will not set it. 3077e97b8daSDavid Sterba */ 3087e97b8daSDavid Sterba if (inode->i_size == 0) 309d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 310d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 3117e97b8daSDavid Sterba } else { 312d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 3137e97b8daSDavid Sterba } 3147e97b8daSDavid Sterba } else { 3157e97b8daSDavid Sterba /* 31601327610SNicholas D Steeves * Revert back under same assumptions as above 3177e97b8daSDavid Sterba */ 31844e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 3197e97b8daSDavid Sterba if (inode->i_size == 0) 320d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 321d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 3227e97b8daSDavid Sterba } else { 323d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3247e97b8daSDavid Sterba } 3257e97b8daSDavid Sterba } 3266cbff00fSChristoph Hellwig 32775e7cb7fSLiu Bo /* 32875e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 32975e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 33075e7cb7fSLiu Bo * things smaller. 33175e7cb7fSLiu Bo */ 3325c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 333d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 334d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3355c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 33663541927SFilipe David Borba Manana 33797fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 33897fc2977SMiklos Szeredi return -ETXTBSY; 339eede2bf3SOmar Sandoval 340d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 341d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 34263541927SFilipe David Borba Manana 34393370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 34493370509SDavid Sterba if (!comp || comp[0] == 0) 34593370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 346ebcb904dSLi Zefan } else { 347d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 34875e7cb7fSLiu Bo } 3496cbff00fSChristoph Hellwig 350ff9fef55SAnand Jain /* 351ff9fef55SAnand Jain * 1 for inode item 352ff9fef55SAnand Jain * 2 for properties 353ff9fef55SAnand Jain */ 354ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 35597fc2977SMiklos Szeredi if (IS_ERR(trans)) 35697fc2977SMiklos Szeredi return PTR_ERR(trans); 3576cbff00fSChristoph Hellwig 358ff9fef55SAnand Jain if (comp) { 359ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 360ff9fef55SAnand Jain strlen(comp), 0); 361ff9fef55SAnand Jain if (ret) { 362ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 363ff9fef55SAnand Jain goto out_end_trans; 364ff9fef55SAnand Jain } 365ff9fef55SAnand Jain } else { 366ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 367ff9fef55SAnand Jain 0, 0); 368ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 369ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 370ff9fef55SAnand Jain goto out_end_trans; 371ff9fef55SAnand Jain } 372ff9fef55SAnand Jain } 373ff9fef55SAnand Jain 37497fc2977SMiklos Szeredi update_flags: 375d2b8fcfeSAnand Jain binode->flags = binode_flags; 3767b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3770c4d2d95SJosef Bacik inode_inc_iversion(inode); 378c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3799a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3806cbff00fSChristoph Hellwig 381ff9fef55SAnand Jain out_end_trans: 3823a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3832d4e6f6aSliubo return ret; 3846cbff00fSChristoph Hellwig } 3856cbff00fSChristoph Hellwig 3860d7ed32cSDavid Sterba /* 3870d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3880d7ed32cSDavid Sterba */ 389c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 390c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 391c3e1f96cSGoldwyn Rodrigues { 3920d7ed32cSDavid Sterba bool ret = false; 3930d7ed32cSDavid Sterba 3940d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3950d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3960d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3970d7ed32cSDavid Sterba ret = true; 3980d7ed32cSDavid Sterba } 3990d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 4000d7ed32cSDavid Sterba 4010d7ed32cSDavid Sterba return ret; 402c3e1f96cSGoldwyn Rodrigues } 403c3e1f96cSGoldwyn Rodrigues 404578bda9eSDavid Sterba /* 405578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 406578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 407578bda9eSDavid Sterba * btrfs_exclop_finish. 408578bda9eSDavid Sterba * 409578bda9eSDavid Sterba * Compatibility: 410578bda9eSDavid Sterba * - the same type is already running 411621a1ee1SNikolay Borisov * - when trying to add a device and balance has been paused 412578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 413578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 414578bda9eSDavid Sterba */ 415578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 416578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 417578bda9eSDavid Sterba { 418578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 419621a1ee1SNikolay Borisov if (fs_info->exclusive_operation == type || 420621a1ee1SNikolay Borisov (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && 421621a1ee1SNikolay Borisov type == BTRFS_EXCLOP_DEV_ADD)) 422578bda9eSDavid Sterba return true; 423578bda9eSDavid Sterba 424578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 425578bda9eSDavid Sterba return false; 426578bda9eSDavid Sterba } 427578bda9eSDavid Sterba 428578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 429578bda9eSDavid Sterba { 430578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 431578bda9eSDavid Sterba } 432578bda9eSDavid Sterba 433c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 434c3e1f96cSGoldwyn Rodrigues { 4350d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 436c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4370d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 43866a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 439c3e1f96cSGoldwyn Rodrigues } 440c3e1f96cSGoldwyn Rodrigues 441efc0e69cSNikolay Borisov void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, 442efc0e69cSNikolay Borisov enum btrfs_exclusive_operation op) 443efc0e69cSNikolay Borisov { 444efc0e69cSNikolay Borisov switch (op) { 445efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE_PAUSED: 446efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 447efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || 448efc0e69cSNikolay Borisov fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); 449efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; 450efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 451efc0e69cSNikolay Borisov break; 452efc0e69cSNikolay Borisov case BTRFS_EXCLOP_BALANCE: 453efc0e69cSNikolay Borisov spin_lock(&fs_info->super_lock); 454efc0e69cSNikolay Borisov ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); 455efc0e69cSNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; 456efc0e69cSNikolay Borisov spin_unlock(&fs_info->super_lock); 457efc0e69cSNikolay Borisov break; 458efc0e69cSNikolay Borisov default: 459efc0e69cSNikolay Borisov btrfs_warn(fs_info, 460efc0e69cSNikolay Borisov "invalid exclop balance operation %d requested", op); 461efc0e69cSNikolay Borisov } 462efc0e69cSNikolay Borisov } 463efc0e69cSNikolay Borisov 464dc408ccdSSahil Kang static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) 4656cbff00fSChristoph Hellwig { 4666cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4676cbff00fSChristoph Hellwig } 468f46b5a66SChristoph Hellwig 469b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 470b929c1d8SMarcos Paulo de Souza void __user *arg) 471f7039b1dSLi Dongyang { 472f7039b1dSLi Dongyang struct btrfs_device *device; 473f7039b1dSLi Dongyang struct fstrim_range range; 474f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 475f7039b1dSLi Dongyang u64 num_devices = 0; 476f7039b1dSLi Dongyang int ret; 477f7039b1dSLi Dongyang 478f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 479f7039b1dSLi Dongyang return -EPERM; 480f7039b1dSLi Dongyang 481f35f06c3SFilipe Manana /* 4821cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4831cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4841cb3dc3fSNaohiro Aota * filesystem for now. 4851cb3dc3fSNaohiro Aota */ 4861cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4871cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4881cb3dc3fSNaohiro Aota 4891cb3dc3fSNaohiro Aota /* 490f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 491f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 492f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 493f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 494f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 495f35f06c3SFilipe Manana */ 496f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 497f35f06c3SFilipe Manana return -EROFS; 498f35f06c3SFilipe Manana 4991f78160cSXiao Guangrong rcu_read_lock(); 5001f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5011f78160cSXiao Guangrong dev_list) { 5027b47ef52SChristoph Hellwig if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) 503f7039b1dSLi Dongyang continue; 504f7039b1dSLi Dongyang num_devices++; 5057b47ef52SChristoph Hellwig minlen = min_t(u64, bdev_discard_granularity(device->bdev), 506f7039b1dSLi Dongyang minlen); 507f7039b1dSLi Dongyang } 5081f78160cSXiao Guangrong rcu_read_unlock(); 509f4c697e6SLukas Czerner 510f7039b1dSLi Dongyang if (!num_devices) 511f7039b1dSLi Dongyang return -EOPNOTSUPP; 512f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 513f7039b1dSLi Dongyang return -EFAULT; 5146ba9fc8eSQu Wenruo 5156ba9fc8eSQu Wenruo /* 5166ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5176ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5186ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5196ba9fc8eSQu Wenruo */ 5206ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 521f4c697e6SLukas Czerner return -EINVAL; 522f7039b1dSLi Dongyang 523f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5242ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 525f7039b1dSLi Dongyang if (ret < 0) 526f7039b1dSLi Dongyang return ret; 527f7039b1dSLi Dongyang 528f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 529f7039b1dSLi Dongyang return -EFAULT; 530f7039b1dSLi Dongyang 531f7039b1dSLi Dongyang return 0; 532f7039b1dSLi Dongyang } 533f7039b1dSLi Dongyang 534e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 535dd5f9615SStefan Behrens { 53646e0f66aSChris Mason int i; 53746e0f66aSChris Mason 53846e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 53946e0f66aSChris Mason if (uuid[i]) 54046e0f66aSChris Mason return 0; 54146e0f66aSChris Mason } 54246e0f66aSChris Mason return 1; 543dd5f9615SStefan Behrens } 544dd5f9615SStefan Behrens 5453538d68dSOmar Sandoval /* 5463538d68dSOmar Sandoval * Calculate the number of transaction items to reserve for creating a subvolume 5473538d68dSOmar Sandoval * or snapshot, not including the inode, directory entries, or parent directory. 5483538d68dSOmar Sandoval */ 5493538d68dSOmar Sandoval static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) 5503538d68dSOmar Sandoval { 5513538d68dSOmar Sandoval /* 5523538d68dSOmar Sandoval * 1 to add root block 5533538d68dSOmar Sandoval * 1 to add root item 5543538d68dSOmar Sandoval * 1 to add root ref 5553538d68dSOmar Sandoval * 1 to add root backref 5563538d68dSOmar Sandoval * 1 to add UUID item 5573538d68dSOmar Sandoval * 1 to add qgroup info 5583538d68dSOmar Sandoval * 1 to add qgroup limit 5593538d68dSOmar Sandoval * 5603538d68dSOmar Sandoval * Ideally the last two would only be accounted if qgroups are enabled, 5613538d68dSOmar Sandoval * but that can change between now and the time we would insert them. 5623538d68dSOmar Sandoval */ 5633538d68dSOmar Sandoval unsigned int num_items = 7; 5643538d68dSOmar Sandoval 5653538d68dSOmar Sandoval if (inherit) { 5663538d68dSOmar Sandoval /* 2 to add qgroup relations for each inherited qgroup */ 5673538d68dSOmar Sandoval num_items += 2 * inherit->num_qgroups; 5683538d68dSOmar Sandoval } 5693538d68dSOmar Sandoval return num_items; 5703538d68dSOmar Sandoval } 5713538d68dSOmar Sandoval 5724d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5734d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 5748696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 575f46b5a66SChristoph Hellwig { 5760b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 577f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 578f46b5a66SChristoph Hellwig struct btrfs_key key; 57949a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 580f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 581f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 582d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 58376dda93cSYan, Zheng struct btrfs_root *new_root; 584d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 58595582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5863538d68dSOmar Sandoval struct btrfs_new_inode_args new_inode_args = { 5873538d68dSOmar Sandoval .dir = dir, 5883538d68dSOmar Sandoval .dentry = dentry, 5893538d68dSOmar Sandoval .subvol = true, 5903538d68dSOmar Sandoval }; 5913538d68dSOmar Sandoval unsigned int trans_num_items; 592f46b5a66SChristoph Hellwig int ret; 5932256e901SOmar Sandoval dev_t anon_dev; 594f46b5a66SChristoph Hellwig u64 objectid; 595f46b5a66SChristoph Hellwig 59649a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 59749a3c4d9SDavid Sterba if (!root_item) 59849a3c4d9SDavid Sterba return -ENOMEM; 59949a3c4d9SDavid Sterba 600543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6012fbe8c8aSAl Viro if (ret) 6022256e901SOmar Sandoval goto out_root_item; 6032dfb1e43SQu Wenruo 604e09fe2d2SQu Wenruo /* 605e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 60601327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 607e09fe2d2SQu Wenruo */ 60849a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 60949a3c4d9SDavid Sterba ret = -ENOSPC; 6102256e901SOmar Sandoval goto out_root_item; 61149a3c4d9SDavid Sterba } 612e09fe2d2SQu Wenruo 6132256e901SOmar Sandoval ret = get_anon_bdev(&anon_dev); 6142256e901SOmar Sandoval if (ret < 0) 6152256e901SOmar Sandoval goto out_root_item; 6162256e901SOmar Sandoval 6173538d68dSOmar Sandoval new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); 6183538d68dSOmar Sandoval if (!new_inode_args.inode) { 619a1fd0c35SOmar Sandoval ret = -ENOMEM; 620a1fd0c35SOmar Sandoval goto out_anon_dev; 621a1fd0c35SOmar Sandoval } 6223538d68dSOmar Sandoval ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); 623d5c12070SMiao Xie if (ret) 624a1fd0c35SOmar Sandoval goto out_inode; 6253538d68dSOmar Sandoval trans_num_items += create_subvol_num_items(inherit); 6263538d68dSOmar Sandoval 6273538d68dSOmar Sandoval btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6283538d68dSOmar Sandoval ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 6293538d68dSOmar Sandoval trans_num_items, false); 6303538d68dSOmar Sandoval if (ret) 6313538d68dSOmar Sandoval goto out_new_inode_args; 632f46b5a66SChristoph Hellwig 633d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 634d5c12070SMiao Xie if (IS_ERR(trans)) { 635d5c12070SMiao Xie ret = PTR_ERR(trans); 636e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 6373538d68dSOmar Sandoval goto out_new_inode_args; 638d5c12070SMiao Xie } 639d5c12070SMiao Xie trans->block_rsv = &block_rsv; 640d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 641f46b5a66SChristoph Hellwig 642a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6436f72c7e2SArne Jansen if (ret) 6442256e901SOmar Sandoval goto out; 6456f72c7e2SArne Jansen 6469631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6479631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6488e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6498e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6502256e901SOmar Sandoval goto out; 6518e8a1e31SJosef Bacik } 652f46b5a66SChristoph Hellwig 653f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 654f46b5a66SChristoph Hellwig 65549a3c4d9SDavid Sterba inode_item = &root_item->inode; 6563cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6573cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6583cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 659da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6600b246afaSJeff Mahoney fs_info->nodesize); 6613cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 662f46b5a66SChristoph Hellwig 66349a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 66449a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6653cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 66608fe4db1SLi Zefan 66749a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 66849a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 66949a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 67049a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 67149a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 67249a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 673f46b5a66SChristoph Hellwig 67449a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 67549a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 676807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 67749a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 67849a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 67949a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 68049a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 68149a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 682f46b5a66SChristoph Hellwig 683925baeddSChris Mason btrfs_tree_unlock(leaf); 684f46b5a66SChristoph Hellwig 68569948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 686f46b5a66SChristoph Hellwig 687f46b5a66SChristoph Hellwig key.objectid = objectid; 6885d4f98a2SYan Zheng key.offset = 0; 689962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6900b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 69149a3c4d9SDavid Sterba root_item); 69267addf29SFilipe Manana if (ret) { 69367addf29SFilipe Manana /* 69467addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 69567addf29SFilipe Manana * tree block so that we don't leak space and leave the 69667addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 6977a163608SFilipe Manana * extent tree with a backreference for a root that does not 698212a58fdSFilipe Manana * exists). 69967addf29SFilipe Manana */ 700212a58fdSFilipe Manana btrfs_tree_lock(leaf); 701212a58fdSFilipe Manana btrfs_clean_tree_block(leaf); 702212a58fdSFilipe Manana btrfs_tree_unlock(leaf); 7037a163608SFilipe Manana btrfs_free_tree_block(trans, objectid, leaf, 0, 1); 70467addf29SFilipe Manana free_extent_buffer(leaf); 7052256e901SOmar Sandoval goto out; 70667addf29SFilipe Manana } 70767addf29SFilipe Manana 70867addf29SFilipe Manana free_extent_buffer(leaf); 70967addf29SFilipe Manana leaf = NULL; 710f46b5a66SChristoph Hellwig 7112dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 71379787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 7152256e901SOmar Sandoval goto out; 71679787eaaSJeff Mahoney } 7172256e901SOmar Sandoval /* anon_dev is owned by new_root now. */ 7182dfb1e43SQu Wenruo anon_dev = 0; 7193538d68dSOmar Sandoval BTRFS_I(new_inode_args.inode)->root = new_root; 7203538d68dSOmar Sandoval /* ... and new_root is owned by new_inode_args.inode now. */ 72176dda93cSYan, Zheng 722221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 723221581e4SJosef Bacik if (ret) { 724221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 7252256e901SOmar Sandoval goto out; 726c7e54b51SJosef Bacik } 7270660b5afSChris Mason 728cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7296bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 730caae78e0SOmar Sandoval if (ret) { 73166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 732caae78e0SOmar Sandoval goto out; 733caae78e0SOmar Sandoval } 734dd5f9615SStefan Behrens 735caae78e0SOmar Sandoval ret = btrfs_create_new_inode(trans, &new_inode_args); 736caae78e0SOmar Sandoval if (ret) { 737caae78e0SOmar Sandoval btrfs_abort_transaction(trans, ret); 738caae78e0SOmar Sandoval goto out; 739caae78e0SOmar Sandoval } 740caae78e0SOmar Sandoval 741caae78e0SOmar Sandoval d_instantiate_new(dentry, new_inode_args.inode); 742caae78e0SOmar Sandoval new_inode_args.inode = NULL; 743f46b5a66SChristoph Hellwig 7442256e901SOmar Sandoval out: 745d5c12070SMiao Xie trans->block_rsv = NULL; 746d5c12070SMiao Xie trans->bytes_reserved = 0; 747e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 748de6e8200SLiu Bo 7491b58ae0eSFilipe Manana if (ret) 7501b58ae0eSFilipe Manana btrfs_end_transaction(trans); 7511b58ae0eSFilipe Manana else 7521b58ae0eSFilipe Manana ret = btrfs_commit_transaction(trans); 7533538d68dSOmar Sandoval out_new_inode_args: 7543538d68dSOmar Sandoval btrfs_new_inode_args_destroy(&new_inode_args); 755a1fd0c35SOmar Sandoval out_inode: 7563538d68dSOmar Sandoval iput(new_inode_args.inode); 7572256e901SOmar Sandoval out_anon_dev: 7582dfb1e43SQu Wenruo if (anon_dev) 7592dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 7602256e901SOmar Sandoval out_root_item: 76149a3c4d9SDavid Sterba kfree(root_item); 76249a3c4d9SDavid Sterba return ret; 763f46b5a66SChristoph Hellwig } 764f46b5a66SChristoph Hellwig 765e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7669babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 767e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 768f46b5a66SChristoph Hellwig { 7690b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7702e4bfab9SYan, Zheng struct inode *inode; 771f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 7723538d68dSOmar Sandoval unsigned int trans_num_items; 773f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7742e4bfab9SYan, Zheng int ret; 775f46b5a66SChristoph Hellwig 776813febdbSJosef Bacik /* We do not support snapshotting right now. */ 777813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 778813febdbSJosef Bacik btrfs_warn(fs_info, 779813febdbSJosef Bacik "extent tree v2 doesn't support snapshotting yet"); 780813febdbSJosef Bacik return -EOPNOTSUPP; 781813febdbSJosef Bacik } 782813febdbSJosef Bacik 78392a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 784f46b5a66SChristoph Hellwig return -EINVAL; 785f46b5a66SChristoph Hellwig 786eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 787eede2bf3SOmar Sandoval btrfs_warn(fs_info, 788eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 789eede2bf3SOmar Sandoval return -ETXTBSY; 790eede2bf3SOmar Sandoval } 791eede2bf3SOmar Sandoval 79223269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 793a1ee7362SDavid Sterba if (!pending_snapshot) 794a1ee7362SDavid Sterba return -ENOMEM; 795a1ee7362SDavid Sterba 7962dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7972dfb1e43SQu Wenruo if (ret < 0) 7982dfb1e43SQu Wenruo goto free_pending; 799b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 80023269bf5SDavid Sterba GFP_KERNEL); 8018546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8028546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 803b0c0ea63SDavid Sterba ret = -ENOMEM; 804b0c0ea63SDavid Sterba goto free_pending; 805b0c0ea63SDavid Sterba } 806b0c0ea63SDavid Sterba 80766d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 80866d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 809d5c12070SMiao Xie /* 8103538d68dSOmar Sandoval * 1 to add dir item 8113538d68dSOmar Sandoval * 1 to add dir index 8123538d68dSOmar Sandoval * 1 to update parent inode item 813d5c12070SMiao Xie */ 8143538d68dSOmar Sandoval trans_num_items = create_subvol_num_items(inherit) + 3; 815d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 8163538d68dSOmar Sandoval &pending_snapshot->block_rsv, 8173538d68dSOmar Sandoval trans_num_items, false); 818d5c12070SMiao Xie if (ret) 819c11fbb6eSRobbie Ko goto free_pending; 820d5c12070SMiao Xie 821a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 822a22285a6SYan, Zheng pending_snapshot->root = root; 823b83cc969SLi Zefan pending_snapshot->readonly = readonly; 824e9662f70SMiao Xie pending_snapshot->dir = dir; 8258696c533SMiao Xie pending_snapshot->inherit = inherit; 826a22285a6SYan, Zheng 827d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 828a22285a6SYan, Zheng if (IS_ERR(trans)) { 829a22285a6SYan, Zheng ret = PTR_ERR(trans); 830a22285a6SYan, Zheng goto fail; 831a22285a6SYan, Zheng } 832a22285a6SYan, Zheng 83328b21c55SFilipe Manana trans->pending_snapshot = pending_snapshot; 8349babda9fSNikolay Borisov 8353a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 836aec8030aSMiao Xie if (ret) 837c37b2b62SJosef Bacik goto fail; 838a22285a6SYan, Zheng 839a22285a6SYan, Zheng ret = pending_snapshot->error; 840f46b5a66SChristoph Hellwig if (ret) 8412e4bfab9SYan, Zheng goto fail; 842f46b5a66SChristoph Hellwig 843d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 844d3797308SChris Mason if (ret) 845d3797308SChris Mason goto fail; 846d3797308SChris Mason 8472b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8482e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8492e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8502e4bfab9SYan, Zheng goto fail; 8512e4bfab9SYan, Zheng } 8525662344bSTsutomu Itoh 8532e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8542e4bfab9SYan, Zheng ret = 0; 8552dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8562e4bfab9SYan, Zheng fail: 8572dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8582dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8592dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 86000246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 861e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 862b0c0ea63SDavid Sterba free_pending: 8632dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8642dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 865b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8668546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 867a1ee7362SDavid Sterba kfree(pending_snapshot); 868a1ee7362SDavid Sterba 869f46b5a66SChristoph Hellwig return ret; 870f46b5a66SChristoph Hellwig } 871f46b5a66SChristoph Hellwig 8724260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8734260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8744260f7c7SSage Weil * whether the type of victim is right. 8754260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8764260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8774260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8784260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8794260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8804260f7c7SSage Weil * a. be owner of dir, or 8814260f7c7SSage Weil * b. be owner of victim, or 8824260f7c7SSage Weil * c. have CAP_FOWNER capability 88301327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8844260f7c7SSage Weil * links pointing to it. 8854260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8864260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8874260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8884260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8894260f7c7SSage Weil * nfs_async_unlink(). 8904260f7c7SSage Weil */ 8914260f7c7SSage Weil 892c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 893c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8944260f7c7SSage Weil { 8954260f7c7SSage Weil int error; 8964260f7c7SSage Weil 8972b0143b5SDavid Howells if (d_really_is_negative(victim)) 8984260f7c7SSage Weil return -ENOENT; 8994260f7c7SSage Weil 9002b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9014fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9024260f7c7SSage Weil 903c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 9044260f7c7SSage Weil if (error) 9054260f7c7SSage Weil return error; 9064260f7c7SSage Weil if (IS_APPEND(dir)) 9074260f7c7SSage Weil return -EPERM; 908c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 909ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 910ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9114260f7c7SSage Weil return -EPERM; 9124260f7c7SSage Weil if (isdir) { 913e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9144260f7c7SSage Weil return -ENOTDIR; 9154260f7c7SSage Weil if (IS_ROOT(victim)) 9164260f7c7SSage Weil return -EBUSY; 917e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9184260f7c7SSage Weil return -EISDIR; 9194260f7c7SSage Weil if (IS_DEADDIR(dir)) 9204260f7c7SSage Weil return -ENOENT; 9214260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9224260f7c7SSage Weil return -EBUSY; 9234260f7c7SSage Weil return 0; 9244260f7c7SSage Weil } 9254260f7c7SSage Weil 926cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 9274d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 9284d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 929cb8e7090SChristoph Hellwig { 9302b0143b5SDavid Howells if (d_really_is_positive(child)) 931cb8e7090SChristoph Hellwig return -EEXIST; 932cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 933cb8e7090SChristoph Hellwig return -ENOENT; 9344d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 9355474bf40SChristian Brauner return -EOVERFLOW; 9364d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 937cb8e7090SChristoph Hellwig } 938cb8e7090SChristoph Hellwig 939cb8e7090SChristoph Hellwig /* 940cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 941cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 942cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 943cb8e7090SChristoph Hellwig */ 94492872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 9454d4340c9SChristian Brauner struct user_namespace *mnt_userns, 94652f75f4fSDavid Sterba const char *name, int namelen, 94772fd032eSSage Weil struct btrfs_root *snap_src, 9489babda9fSNikolay Borisov bool readonly, 9498696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 950cb8e7090SChristoph Hellwig { 9512b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 953cb8e7090SChristoph Hellwig struct dentry *dentry; 954cb8e7090SChristoph Hellwig int error; 955cb8e7090SChristoph Hellwig 95600235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 95700235411SAl Viro if (error == -EINTR) 95800235411SAl Viro return error; 959cb8e7090SChristoph Hellwig 9604d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 961cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 962cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 963cb8e7090SChristoph Hellwig goto out_unlock; 964cb8e7090SChristoph Hellwig 9654d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 966cb8e7090SChristoph Hellwig if (error) 967a874a63eSLiu Bo goto out_dput; 968cb8e7090SChristoph Hellwig 9699c52057cSChris Mason /* 9709c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9719c52057cSChris Mason * check for them now when we can safely fail 9729c52057cSChris Mason */ 9739c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9749c52057cSChris Mason dir->i_ino, name, 9759c52057cSChris Mason namelen); 9769c52057cSChris Mason if (error) 9779c52057cSChris Mason goto out_dput; 9789c52057cSChris Mason 9790b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 98076dda93cSYan, Zheng 98176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 98276dda93cSYan, Zheng goto out_up_read; 98376dda93cSYan, Zheng 9849babda9fSNikolay Borisov if (snap_src) 9859babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9869babda9fSNikolay Borisov else 98770dc55f4SOmar Sandoval error = create_subvol(mnt_userns, dir, dentry, inherit); 9889babda9fSNikolay Borisov 98976dda93cSYan, Zheng if (!error) 99076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 99176dda93cSYan, Zheng out_up_read: 9920b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 993cb8e7090SChristoph Hellwig out_dput: 994cb8e7090SChristoph Hellwig dput(dentry); 995cb8e7090SChristoph Hellwig out_unlock: 99664708539SJosef Bacik btrfs_inode_unlock(dir, 0); 997cb8e7090SChristoph Hellwig return error; 998cb8e7090SChristoph Hellwig } 999cb8e7090SChristoph Hellwig 1000c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 10014d4340c9SChristian Brauner struct user_namespace *mnt_userns, 1002c11fbb6eSRobbie Ko const char *name, int namelen, 1003c11fbb6eSRobbie Ko struct btrfs_root *root, 1004c11fbb6eSRobbie Ko bool readonly, 1005c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1006c11fbb6eSRobbie Ko { 1007c11fbb6eSRobbie Ko int ret; 1008c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1009c11fbb6eSRobbie Ko 1010c11fbb6eSRobbie Ko /* 1011c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1012c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1013c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1014c11fbb6eSRobbie Ko */ 1015c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1016c11fbb6eSRobbie Ko 1017f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1018c11fbb6eSRobbie Ko if (ret) 1019c11fbb6eSRobbie Ko goto out; 1020c11fbb6eSRobbie Ko 1021c11fbb6eSRobbie Ko /* 1022c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1023c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1024c11fbb6eSRobbie Ko * creation. 1025c11fbb6eSRobbie Ko */ 1026c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1027c11fbb6eSRobbie Ko snapshot_force_cow = true; 1028c11fbb6eSRobbie Ko 1029c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1030c11fbb6eSRobbie Ko 10314d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 1032c11fbb6eSRobbie Ko root, readonly, inherit); 1033c11fbb6eSRobbie Ko out: 1034c11fbb6eSRobbie Ko if (snapshot_force_cow) 1035c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1036c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1037c11fbb6eSRobbie Ko return ret; 1038c11fbb6eSRobbie Ko } 1039c11fbb6eSRobbie Ko 1040d5633b0dSQu Wenruo /* 1041d5633b0dSQu Wenruo * Defrag specific helper to get an extent map. 1042d5633b0dSQu Wenruo * 1043d5633b0dSQu Wenruo * Differences between this and btrfs_get_extent() are: 1044d5633b0dSQu Wenruo * 1045d5633b0dSQu Wenruo * - No extent_map will be added to inode->extent_tree 1046d5633b0dSQu Wenruo * To reduce memory usage in the long run. 1047d5633b0dSQu Wenruo * 1048d5633b0dSQu Wenruo * - Extra optimization to skip file extents older than @newer_than 1049d5633b0dSQu Wenruo * By using btrfs_search_forward() we can skip entire file ranges that 1050d5633b0dSQu Wenruo * have extents created in past transactions, because btrfs_search_forward() 1051d5633b0dSQu Wenruo * will not visit leaves and nodes with a generation smaller than given 1052d5633b0dSQu Wenruo * minimal generation threshold (@newer_than). 1053d5633b0dSQu Wenruo * 1054d5633b0dSQu Wenruo * Return valid em if we find a file extent matching the requirement. 1055d5633b0dSQu Wenruo * Return NULL if we can not find a file extent matching the requirement. 1056d5633b0dSQu Wenruo * 1057d5633b0dSQu Wenruo * Return ERR_PTR() for error. 1058d5633b0dSQu Wenruo */ 1059d5633b0dSQu Wenruo static struct extent_map *defrag_get_extent(struct btrfs_inode *inode, 1060d5633b0dSQu Wenruo u64 start, u64 newer_than) 1061d5633b0dSQu Wenruo { 1062d5633b0dSQu Wenruo struct btrfs_root *root = inode->root; 1063d5633b0dSQu Wenruo struct btrfs_file_extent_item *fi; 1064d5633b0dSQu Wenruo struct btrfs_path path = { 0 }; 1065d5633b0dSQu Wenruo struct extent_map *em; 1066d5633b0dSQu Wenruo struct btrfs_key key; 1067d5633b0dSQu Wenruo u64 ino = btrfs_ino(inode); 1068d5633b0dSQu Wenruo int ret; 1069d5633b0dSQu Wenruo 1070d5633b0dSQu Wenruo em = alloc_extent_map(); 1071d5633b0dSQu Wenruo if (!em) { 1072d5633b0dSQu Wenruo ret = -ENOMEM; 1073d5633b0dSQu Wenruo goto err; 1074d5633b0dSQu Wenruo } 1075d5633b0dSQu Wenruo 1076d5633b0dSQu Wenruo key.objectid = ino; 1077d5633b0dSQu Wenruo key.type = BTRFS_EXTENT_DATA_KEY; 1078d5633b0dSQu Wenruo key.offset = start; 1079d5633b0dSQu Wenruo 1080d5633b0dSQu Wenruo if (newer_than) { 1081d5633b0dSQu Wenruo ret = btrfs_search_forward(root, &key, &path, newer_than); 1082d5633b0dSQu Wenruo if (ret < 0) 1083d5633b0dSQu Wenruo goto err; 1084d5633b0dSQu Wenruo /* Can't find anything newer */ 1085d5633b0dSQu Wenruo if (ret > 0) 1086d5633b0dSQu Wenruo goto not_found; 1087d5633b0dSQu Wenruo } else { 1088d5633b0dSQu Wenruo ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); 1089d5633b0dSQu Wenruo if (ret < 0) 1090d5633b0dSQu Wenruo goto err; 1091d5633b0dSQu Wenruo } 1092d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { 1093d5633b0dSQu Wenruo /* 1094d5633b0dSQu Wenruo * If btrfs_search_slot() makes path to point beyond nritems, 1095d5633b0dSQu Wenruo * we should not have an empty leaf, as this inode must at 1096d5633b0dSQu Wenruo * least have its INODE_ITEM. 1097d5633b0dSQu Wenruo */ 1098d5633b0dSQu Wenruo ASSERT(btrfs_header_nritems(path.nodes[0])); 1099d5633b0dSQu Wenruo path.slots[0] = btrfs_header_nritems(path.nodes[0]) - 1; 1100d5633b0dSQu Wenruo } 1101d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1102d5633b0dSQu Wenruo /* Perfect match, no need to go one slot back */ 1103d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY && 1104d5633b0dSQu Wenruo key.offset == start) 1105d5633b0dSQu Wenruo goto iterate; 1106d5633b0dSQu Wenruo 1107d5633b0dSQu Wenruo /* We didn't find a perfect match, needs to go one slot back */ 1108d5633b0dSQu Wenruo if (path.slots[0] > 0) { 1109d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1110d5633b0dSQu Wenruo if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY) 1111d5633b0dSQu Wenruo path.slots[0]--; 1112d5633b0dSQu Wenruo } 1113d5633b0dSQu Wenruo 1114d5633b0dSQu Wenruo iterate: 1115d5633b0dSQu Wenruo /* Iterate through the path to find a file extent covering @start */ 1116d5633b0dSQu Wenruo while (true) { 1117d5633b0dSQu Wenruo u64 extent_end; 1118d5633b0dSQu Wenruo 1119d5633b0dSQu Wenruo if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) 1120d5633b0dSQu Wenruo goto next; 1121d5633b0dSQu Wenruo 1122d5633b0dSQu Wenruo btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); 1123d5633b0dSQu Wenruo 1124d5633b0dSQu Wenruo /* 1125d5633b0dSQu Wenruo * We may go one slot back to INODE_REF/XATTR item, then 1126d5633b0dSQu Wenruo * need to go forward until we reach an EXTENT_DATA. 1127d5633b0dSQu Wenruo * But we should still has the correct ino as key.objectid. 1128d5633b0dSQu Wenruo */ 1129d5633b0dSQu Wenruo if (WARN_ON(key.objectid < ino) || key.type < BTRFS_EXTENT_DATA_KEY) 1130d5633b0dSQu Wenruo goto next; 1131d5633b0dSQu Wenruo 1132d5633b0dSQu Wenruo /* It's beyond our target range, definitely not extent found */ 1133d5633b0dSQu Wenruo if (key.objectid > ino || key.type > BTRFS_EXTENT_DATA_KEY) 1134d5633b0dSQu Wenruo goto not_found; 1135d5633b0dSQu Wenruo 1136d5633b0dSQu Wenruo /* 1137d5633b0dSQu Wenruo * | |<- File extent ->| 1138d5633b0dSQu Wenruo * \- start 1139d5633b0dSQu Wenruo * 1140d5633b0dSQu Wenruo * This means there is a hole between start and key.offset. 1141d5633b0dSQu Wenruo */ 1142d5633b0dSQu Wenruo if (key.offset > start) { 1143d5633b0dSQu Wenruo em->start = start; 1144d5633b0dSQu Wenruo em->orig_start = start; 1145d5633b0dSQu Wenruo em->block_start = EXTENT_MAP_HOLE; 1146d5633b0dSQu Wenruo em->len = key.offset - start; 1147d5633b0dSQu Wenruo break; 1148d5633b0dSQu Wenruo } 1149d5633b0dSQu Wenruo 1150d5633b0dSQu Wenruo fi = btrfs_item_ptr(path.nodes[0], path.slots[0], 1151d5633b0dSQu Wenruo struct btrfs_file_extent_item); 1152d5633b0dSQu Wenruo extent_end = btrfs_file_extent_end(&path); 1153d5633b0dSQu Wenruo 1154d5633b0dSQu Wenruo /* 1155d5633b0dSQu Wenruo * |<- file extent ->| | 1156d5633b0dSQu Wenruo * \- start 1157d5633b0dSQu Wenruo * 1158d5633b0dSQu Wenruo * We haven't reached start, search next slot. 1159d5633b0dSQu Wenruo */ 1160d5633b0dSQu Wenruo if (extent_end <= start) 1161d5633b0dSQu Wenruo goto next; 1162d5633b0dSQu Wenruo 1163d5633b0dSQu Wenruo /* Now this extent covers @start, convert it to em */ 1164d5633b0dSQu Wenruo btrfs_extent_item_to_extent_map(inode, &path, fi, false, em); 1165d5633b0dSQu Wenruo break; 1166d5633b0dSQu Wenruo next: 1167d5633b0dSQu Wenruo ret = btrfs_next_item(root, &path); 1168d5633b0dSQu Wenruo if (ret < 0) 1169d5633b0dSQu Wenruo goto err; 1170d5633b0dSQu Wenruo if (ret > 0) 1171d5633b0dSQu Wenruo goto not_found; 1172d5633b0dSQu Wenruo } 1173d5633b0dSQu Wenruo btrfs_release_path(&path); 1174d5633b0dSQu Wenruo return em; 1175d5633b0dSQu Wenruo 1176d5633b0dSQu Wenruo not_found: 1177d5633b0dSQu Wenruo btrfs_release_path(&path); 1178d5633b0dSQu Wenruo free_extent_map(em); 1179d5633b0dSQu Wenruo return NULL; 1180d5633b0dSQu Wenruo 1181d5633b0dSQu Wenruo err: 1182d5633b0dSQu Wenruo btrfs_release_path(&path); 1183d5633b0dSQu Wenruo free_extent_map(em); 1184d5633b0dSQu Wenruo return ERR_PTR(ret); 1185d5633b0dSQu Wenruo } 1186d5633b0dSQu Wenruo 1187e9eec721SQu Wenruo static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, 1188d5633b0dSQu Wenruo u64 newer_than, bool locked) 118917ce6ef8SLiu Bo { 119017ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1191940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11926c282eb4SLi Zefan struct extent_map *em; 119376068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1194940100a4SChris Mason 1195940100a4SChris Mason /* 1196940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1197940100a4SChris Mason * the full extent lock 1198940100a4SChris Mason */ 1199940100a4SChris Mason read_lock(&em_tree->lock); 120076068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1201940100a4SChris Mason read_unlock(&em_tree->lock); 1202940100a4SChris Mason 1203199257a7SQu Wenruo /* 1204199257a7SQu Wenruo * We can get a merged extent, in that case, we need to re-search 1205199257a7SQu Wenruo * tree to get the original em for defrag. 1206199257a7SQu Wenruo * 1207199257a7SQu Wenruo * If @newer_than is 0 or em::generation < newer_than, we can trust 1208199257a7SQu Wenruo * this em, as either we don't care about the generation, or the 1209199257a7SQu Wenruo * merged extent map will be rejected anyway. 1210199257a7SQu Wenruo */ 1211199257a7SQu Wenruo if (em && test_bit(EXTENT_FLAG_MERGED, &em->flags) && 1212199257a7SQu Wenruo newer_than && em->generation >= newer_than) { 1213199257a7SQu Wenruo free_extent_map(em); 1214199257a7SQu Wenruo em = NULL; 1215199257a7SQu Wenruo } 1216199257a7SQu Wenruo 1217940100a4SChris Mason if (!em) { 1218308d9800SFilipe Manana struct extent_state *cached = NULL; 121976068caeSQu Wenruo u64 end = start + sectorsize - 1; 1220308d9800SFilipe Manana 1221940100a4SChris Mason /* get the big lock and read metadata off disk */ 1222e9eec721SQu Wenruo if (!locked) 1223570eb97bSJosef Bacik lock_extent(io_tree, start, end, &cached); 1224d5633b0dSQu Wenruo em = defrag_get_extent(BTRFS_I(inode), start, newer_than); 1225e9eec721SQu Wenruo if (!locked) 1226570eb97bSJosef Bacik unlock_extent(io_tree, start, end, &cached); 1227940100a4SChris Mason 12286cf8bfbfSDan Carpenter if (IS_ERR(em)) 12296c282eb4SLi Zefan return NULL; 1230940100a4SChris Mason } 1231940100a4SChris Mason 12326c282eb4SLi Zefan return em; 12336c282eb4SLi Zefan } 12346c282eb4SLi Zefan 1235d7601566SNaohiro Aota static u32 get_extent_max_capacity(const struct btrfs_fs_info *fs_info, 1236d7601566SNaohiro Aota const struct extent_map *em) 1237979b25c3SQu Wenruo { 1238979b25c3SQu Wenruo if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) 1239979b25c3SQu Wenruo return BTRFS_MAX_COMPRESSED; 1240d7601566SNaohiro Aota return fs_info->max_extent_size; 1241979b25c3SQu Wenruo } 1242979b25c3SQu Wenruo 1243e9eec721SQu Wenruo static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, 124475a36a7dSQu Wenruo u32 extent_thresh, u64 newer_than, bool locked) 12456c282eb4SLi Zefan { 1246d7601566SNaohiro Aota struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 12476c282eb4SLi Zefan struct extent_map *next; 12487093f152SQu Wenruo bool ret = false; 12496c282eb4SLi Zefan 12506c282eb4SLi Zefan /* this is the last extent */ 12516c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12526c282eb4SLi Zefan return false; 12536c282eb4SLi Zefan 1254d5633b0dSQu Wenruo /* 125575a36a7dSQu Wenruo * Here we need to pass @newer_then when checking the next extent, or 125675a36a7dSQu Wenruo * we will hit a case we mark current extent for defrag, but the next 125775a36a7dSQu Wenruo * one will not be a target. 125875a36a7dSQu Wenruo * This will just cause extra IO without really reducing the fragments. 1259d5633b0dSQu Wenruo */ 126075a36a7dSQu Wenruo next = defrag_lookup_extent(inode, em->start + em->len, newer_than, locked); 12617093f152SQu Wenruo /* No more em or hole */ 1262e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 12637093f152SQu Wenruo goto out; 12647093f152SQu Wenruo if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags)) 12657093f152SQu Wenruo goto out; 1266979b25c3SQu Wenruo /* 1267979b25c3SQu Wenruo * If the next extent is at its max capacity, defragging current extent 1268979b25c3SQu Wenruo * makes no sense, as the total number of extents won't change. 1269979b25c3SQu Wenruo */ 1270d7601566SNaohiro Aota if (next->len >= get_extent_max_capacity(fs_info, em)) 1271979b25c3SQu Wenruo goto out; 127275a36a7dSQu Wenruo /* Skip older extent */ 127375a36a7dSQu Wenruo if (next->generation < newer_than) 127475a36a7dSQu Wenruo goto out; 127575a36a7dSQu Wenruo /* Also check extent size */ 127675a36a7dSQu Wenruo if (next->len >= extent_thresh) 127775a36a7dSQu Wenruo goto out; 127875a36a7dSQu Wenruo 12797093f152SQu Wenruo ret = true; 12807093f152SQu Wenruo out: 12816c282eb4SLi Zefan free_extent_map(next); 12826c282eb4SLi Zefan return ret; 12836c282eb4SLi Zefan } 12846c282eb4SLi Zefan 12854cb5300bSChris Mason /* 12865767b50cSQu Wenruo * Prepare one page to be defragged. 12875767b50cSQu Wenruo * 12885767b50cSQu Wenruo * This will ensure: 12895767b50cSQu Wenruo * 12905767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12915767b50cSQu Wenruo * - No ordered extent exists in the page. 12925767b50cSQu Wenruo * - The page is uptodate. 12935767b50cSQu Wenruo * 12945767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12955767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12965767b50cSQu Wenruo */ 12975767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 12985767b50cSQu Wenruo pgoff_t index) 1299940100a4SChris Mason { 13005767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 13015767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 13025767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 13035767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 13044cb5300bSChris Mason struct extent_state *cached_state = NULL; 13054cb5300bSChris Mason struct page *page; 13065767b50cSQu Wenruo int ret; 13075767b50cSQu Wenruo 1308600a45e1SMiao Xie again: 13095767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 13104cb5300bSChris Mason if (!page) 13115767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 13125767b50cSQu Wenruo 131324bcb454SOmar Sandoval /* 131424bcb454SOmar Sandoval * Since we can defragment files opened read-only, we can encounter 131524bcb454SOmar Sandoval * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We 131624bcb454SOmar Sandoval * can't do I/O using huge pages yet, so return an error for now. 131724bcb454SOmar Sandoval * Filesystem transparent huge pages are typically only used for 131824bcb454SOmar Sandoval * executables that explicitly enable them, so this isn't very 131924bcb454SOmar Sandoval * restrictive. 132024bcb454SOmar Sandoval */ 132124bcb454SOmar Sandoval if (PageCompound(page)) { 132224bcb454SOmar Sandoval unlock_page(page); 132324bcb454SOmar Sandoval put_page(page); 132424bcb454SOmar Sandoval return ERR_PTR(-ETXTBSY); 132524bcb454SOmar Sandoval } 13264cb5300bSChris Mason 132732443de3SQu Wenruo ret = set_page_extent_mapped(page); 132832443de3SQu Wenruo if (ret < 0) { 132932443de3SQu Wenruo unlock_page(page); 133032443de3SQu Wenruo put_page(page); 13315767b50cSQu Wenruo return ERR_PTR(ret); 133232443de3SQu Wenruo } 133332443de3SQu Wenruo 13345767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 1335600a45e1SMiao Xie while (1) { 13365767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 13375767b50cSQu Wenruo 1338570eb97bSJosef Bacik lock_extent(&inode->io_tree, page_start, page_end, &cached_state); 13395767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 1340570eb97bSJosef Bacik unlock_extent(&inode->io_tree, page_start, page_end, 1341e43bbe5eSDavid Sterba &cached_state); 1342600a45e1SMiao Xie if (!ordered) 1343600a45e1SMiao Xie break; 1344600a45e1SMiao Xie 1345600a45e1SMiao Xie unlock_page(page); 1346c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1347600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1348600a45e1SMiao Xie lock_page(page); 13491f12bd06SLiu Bo /* 13505767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 13515767b50cSQu Wenruo * released or not. 13521f12bd06SLiu Bo */ 13535767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 13541f12bd06SLiu Bo unlock_page(page); 135509cbfeafSKirill A. Shutemov put_page(page); 13561f12bd06SLiu Bo goto again; 13571f12bd06SLiu Bo } 1358600a45e1SMiao Xie } 1359600a45e1SMiao Xie 13605767b50cSQu Wenruo /* 13615767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 13625767b50cSQu Wenruo * make it uptodate. 13635767b50cSQu Wenruo */ 13644cb5300bSChris Mason if (!PageUptodate(page)) { 1365fb12489bSMatthew Wilcox (Oracle) btrfs_read_folio(NULL, page_folio(page)); 13664cb5300bSChris Mason lock_page(page); 13675767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 1368600a45e1SMiao Xie unlock_page(page); 136909cbfeafSKirill A. Shutemov put_page(page); 1370600a45e1SMiao Xie goto again; 1371600a45e1SMiao Xie } 13725767b50cSQu Wenruo if (!PageUptodate(page)) { 13735767b50cSQu Wenruo unlock_page(page); 13745767b50cSQu Wenruo put_page(page); 13755767b50cSQu Wenruo return ERR_PTR(-EIO); 13764cb5300bSChris Mason } 13775767b50cSQu Wenruo } 13785767b50cSQu Wenruo return page; 13795767b50cSQu Wenruo } 13804cb5300bSChris Mason 1381eb793cf8SQu Wenruo struct defrag_target_range { 1382eb793cf8SQu Wenruo struct list_head list; 1383eb793cf8SQu Wenruo u64 start; 1384eb793cf8SQu Wenruo u64 len; 1385eb793cf8SQu Wenruo }; 13864cb5300bSChris Mason 13874cb5300bSChris Mason /* 1388eb793cf8SQu Wenruo * Collect all valid target extents. 1389eb793cf8SQu Wenruo * 1390eb793cf8SQu Wenruo * @start: file offset to lookup 1391eb793cf8SQu Wenruo * @len: length to lookup 1392eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1393eb793cf8SQu Wenruo * will be ignored 1394eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1395eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1396eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1397eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1398e9eec721SQu Wenruo * @locked: if the range has already held extent lock 1399eb793cf8SQu Wenruo * @target_list: list of targets file extents 14004cb5300bSChris Mason */ 1401eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1402eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1403eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1404966d879bSQu Wenruo bool locked, struct list_head *target_list, 1405966d879bSQu Wenruo u64 *last_scanned_ret) 1406eb793cf8SQu Wenruo { 1407d7601566SNaohiro Aota struct btrfs_fs_info *fs_info = inode->root->fs_info; 1408966d879bSQu Wenruo bool last_is_target = false; 1409eb793cf8SQu Wenruo u64 cur = start; 1410eb793cf8SQu Wenruo int ret = 0; 1411eb793cf8SQu Wenruo 1412eb793cf8SQu Wenruo while (cur < start + len) { 1413eb793cf8SQu Wenruo struct extent_map *em; 1414eb793cf8SQu Wenruo struct defrag_target_range *new; 1415eb793cf8SQu Wenruo bool next_mergeable = true; 1416eb793cf8SQu Wenruo u64 range_len; 1417eb793cf8SQu Wenruo 1418966d879bSQu Wenruo last_is_target = false; 1419d5633b0dSQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur, 1420d5633b0dSQu Wenruo newer_than, locked); 1421eb793cf8SQu Wenruo if (!em) 1422eb793cf8SQu Wenruo break; 1423eb793cf8SQu Wenruo 1424d8101a0cSQu Wenruo /* 1425d8101a0cSQu Wenruo * If the file extent is an inlined one, we may still want to 1426d8101a0cSQu Wenruo * defrag it (fallthrough) if it will cause a regular extent. 1427d8101a0cSQu Wenruo * This is for users who want to convert inline extents to 1428d8101a0cSQu Wenruo * regular ones through max_inline= mount option. 1429d8101a0cSQu Wenruo */ 1430d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_INLINE && 1431d8101a0cSQu Wenruo em->len <= inode->root->fs_info->max_inline) 1432d8101a0cSQu Wenruo goto next; 1433d8101a0cSQu Wenruo 1434d8101a0cSQu Wenruo /* Skip hole/delalloc/preallocated extents */ 1435d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_HOLE || 1436d8101a0cSQu Wenruo em->block_start == EXTENT_MAP_DELALLOC || 1437eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1438eb793cf8SQu Wenruo goto next; 1439eb793cf8SQu Wenruo 1440eb793cf8SQu Wenruo /* Skip older extent */ 1441eb793cf8SQu Wenruo if (em->generation < newer_than) 1442eb793cf8SQu Wenruo goto next; 1443eb793cf8SQu Wenruo 14440d1ffa22SQu Wenruo /* This em is under writeback, no need to defrag */ 14450d1ffa22SQu Wenruo if (em->generation == (u64)-1) 14460d1ffa22SQu Wenruo goto next; 14470d1ffa22SQu Wenruo 1448eb793cf8SQu Wenruo /* 14490cb5950fSFilipe Manana * Our start offset might be in the middle of an existing extent 14500cb5950fSFilipe Manana * map, so take that into account. 14510cb5950fSFilipe Manana */ 14520cb5950fSFilipe Manana range_len = em->len - (cur - em->start); 14530cb5950fSFilipe Manana /* 14540cb5950fSFilipe Manana * If this range of the extent map is already flagged for delalloc, 14550cb5950fSFilipe Manana * skip it, because: 14560cb5950fSFilipe Manana * 14570cb5950fSFilipe Manana * 1) We could deadlock later, when trying to reserve space for 14580cb5950fSFilipe Manana * delalloc, because in case we can't immediately reserve space 14590cb5950fSFilipe Manana * the flusher can start delalloc and wait for the respective 14600cb5950fSFilipe Manana * ordered extents to complete. The deadlock would happen 14610cb5950fSFilipe Manana * because we do the space reservation while holding the range 14620cb5950fSFilipe Manana * locked, and starting writeback, or finishing an ordered 14630cb5950fSFilipe Manana * extent, requires locking the range; 14640cb5950fSFilipe Manana * 14650cb5950fSFilipe Manana * 2) If there's delalloc there, it means there's dirty pages for 14660cb5950fSFilipe Manana * which writeback has not started yet (we clean the delalloc 14670cb5950fSFilipe Manana * flag when starting writeback and after creating an ordered 14680cb5950fSFilipe Manana * extent). If we mark pages in an adjacent range for defrag, 14690cb5950fSFilipe Manana * then we will have a larger contiguous range for delalloc, 14700cb5950fSFilipe Manana * very likely resulting in a larger extent after writeback is 14710cb5950fSFilipe Manana * triggered (except in a case of free space fragmentation). 14720cb5950fSFilipe Manana */ 14730cb5950fSFilipe Manana if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1, 14740cb5950fSFilipe Manana EXTENT_DELALLOC, 0, NULL)) 14750cb5950fSFilipe Manana goto next; 14760cb5950fSFilipe Manana 14770cb5950fSFilipe Manana /* 1478eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1479eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1480eb793cf8SQu Wenruo */ 1481eb793cf8SQu Wenruo if (do_compress) 1482eb793cf8SQu Wenruo goto add; 1483eb793cf8SQu Wenruo 1484eb793cf8SQu Wenruo /* Skip too large extent */ 14850cb5950fSFilipe Manana if (range_len >= extent_thresh) 1486eb793cf8SQu Wenruo goto next; 1487eb793cf8SQu Wenruo 1488979b25c3SQu Wenruo /* 1489979b25c3SQu Wenruo * Skip extents already at its max capacity, this is mostly for 1490979b25c3SQu Wenruo * compressed extents, which max cap is only 128K. 1491979b25c3SQu Wenruo */ 1492d7601566SNaohiro Aota if (em->len >= get_extent_max_capacity(fs_info, em)) 1493979b25c3SQu Wenruo goto next; 1494979b25c3SQu Wenruo 1495d8101a0cSQu Wenruo /* 1496d8101a0cSQu Wenruo * Normally there are no more extents after an inline one, thus 1497d8101a0cSQu Wenruo * @next_mergeable will normally be false and not defragged. 1498d8101a0cSQu Wenruo * So if an inline extent passed all above checks, just add it 1499d8101a0cSQu Wenruo * for defrag, and be converted to regular extents. 1500d8101a0cSQu Wenruo */ 1501d8101a0cSQu Wenruo if (em->block_start == EXTENT_MAP_INLINE) 1502d8101a0cSQu Wenruo goto add; 1503d8101a0cSQu Wenruo 1504e9eec721SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, 150575a36a7dSQu Wenruo extent_thresh, newer_than, locked); 1506eb793cf8SQu Wenruo if (!next_mergeable) { 1507eb793cf8SQu Wenruo struct defrag_target_range *last; 1508eb793cf8SQu Wenruo 1509eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1510eb793cf8SQu Wenruo if (list_empty(target_list)) 1511eb793cf8SQu Wenruo goto next; 1512eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1513eb793cf8SQu Wenruo struct defrag_target_range, list); 1514eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1515eb793cf8SQu Wenruo if (last->start + last->len != cur) 1516eb793cf8SQu Wenruo goto next; 1517eb793cf8SQu Wenruo 1518eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1519eb793cf8SQu Wenruo } 1520eb793cf8SQu Wenruo 1521eb793cf8SQu Wenruo add: 1522966d879bSQu Wenruo last_is_target = true; 1523eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1524eb793cf8SQu Wenruo /* 1525eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1526eb793cf8SQu Wenruo * last range of the target list. 1527eb793cf8SQu Wenruo */ 1528eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1529eb793cf8SQu Wenruo struct defrag_target_range *last; 1530eb793cf8SQu Wenruo 1531eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1532eb793cf8SQu Wenruo struct defrag_target_range, list); 1533eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1534eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1535eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1536eb793cf8SQu Wenruo last->len += range_len; 1537eb793cf8SQu Wenruo goto next; 1538eb793cf8SQu Wenruo } 1539eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1540eb793cf8SQu Wenruo } 1541eb793cf8SQu Wenruo 1542eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1543eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1544eb793cf8SQu Wenruo if (!new) { 1545eb793cf8SQu Wenruo free_extent_map(em); 1546eb793cf8SQu Wenruo ret = -ENOMEM; 1547eb793cf8SQu Wenruo break; 1548eb793cf8SQu Wenruo } 1549eb793cf8SQu Wenruo new->start = cur; 1550eb793cf8SQu Wenruo new->len = range_len; 1551eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1552eb793cf8SQu Wenruo 1553eb793cf8SQu Wenruo next: 1554eb793cf8SQu Wenruo cur = extent_map_end(em); 1555eb793cf8SQu Wenruo free_extent_map(em); 1556eb793cf8SQu Wenruo } 1557eb793cf8SQu Wenruo if (ret < 0) { 1558eb793cf8SQu Wenruo struct defrag_target_range *entry; 1559eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1560eb793cf8SQu Wenruo 1561eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1562eb793cf8SQu Wenruo list_del_init(&entry->list); 1563eb793cf8SQu Wenruo kfree(entry); 1564eb793cf8SQu Wenruo } 1565eb793cf8SQu Wenruo } 1566966d879bSQu Wenruo if (!ret && last_scanned_ret) { 1567966d879bSQu Wenruo /* 1568966d879bSQu Wenruo * If the last extent is not a target, the caller can skip to 1569966d879bSQu Wenruo * the end of that extent. 1570966d879bSQu Wenruo * Otherwise, we can only go the end of the specified range. 1571966d879bSQu Wenruo */ 1572966d879bSQu Wenruo if (!last_is_target) 1573966d879bSQu Wenruo *last_scanned_ret = max(cur, *last_scanned_ret); 1574966d879bSQu Wenruo else 1575966d879bSQu Wenruo *last_scanned_ret = max(start + len, *last_scanned_ret); 1576966d879bSQu Wenruo } 1577eb793cf8SQu Wenruo return ret; 1578eb793cf8SQu Wenruo } 1579eb793cf8SQu Wenruo 158022b398eeSQu Wenruo #define CLUSTER_SIZE (SZ_256K) 1581a55e65b8SDavid Sterba static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); 158222b398eeSQu Wenruo 158322b398eeSQu Wenruo /* 158422b398eeSQu Wenruo * Defrag one contiguous target range. 158522b398eeSQu Wenruo * 158622b398eeSQu Wenruo * @inode: target inode 158722b398eeSQu Wenruo * @target: target range to defrag 158822b398eeSQu Wenruo * @pages: locked pages covering the defrag range 158922b398eeSQu Wenruo * @nr_pages: number of locked pages 159022b398eeSQu Wenruo * 159122b398eeSQu Wenruo * Caller should ensure: 159222b398eeSQu Wenruo * 159322b398eeSQu Wenruo * - Pages are prepared 159422b398eeSQu Wenruo * Pages should be locked, no ordered extent in the pages range, 159522b398eeSQu Wenruo * no writeback. 159622b398eeSQu Wenruo * 159722b398eeSQu Wenruo * - Extent bits are locked 159822b398eeSQu Wenruo */ 159922b398eeSQu Wenruo static int defrag_one_locked_target(struct btrfs_inode *inode, 160022b398eeSQu Wenruo struct defrag_target_range *target, 160122b398eeSQu Wenruo struct page **pages, int nr_pages, 160222b398eeSQu Wenruo struct extent_state **cached_state) 160322b398eeSQu Wenruo { 160422b398eeSQu Wenruo struct btrfs_fs_info *fs_info = inode->root->fs_info; 160522b398eeSQu Wenruo struct extent_changeset *data_reserved = NULL; 160622b398eeSQu Wenruo const u64 start = target->start; 160722b398eeSQu Wenruo const u64 len = target->len; 160822b398eeSQu Wenruo unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; 160922b398eeSQu Wenruo unsigned long start_index = start >> PAGE_SHIFT; 161022b398eeSQu Wenruo unsigned long first_index = page_index(pages[0]); 161122b398eeSQu Wenruo int ret = 0; 161222b398eeSQu Wenruo int i; 161322b398eeSQu Wenruo 161422b398eeSQu Wenruo ASSERT(last_index - first_index + 1 <= nr_pages); 161522b398eeSQu Wenruo 161622b398eeSQu Wenruo ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); 161722b398eeSQu Wenruo if (ret < 0) 161822b398eeSQu Wenruo return ret; 161922b398eeSQu Wenruo clear_extent_bit(&inode->io_tree, start, start + len - 1, 162022b398eeSQu Wenruo EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1621bd015294SJosef Bacik EXTENT_DEFRAG, cached_state); 162222b398eeSQu Wenruo set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); 162322b398eeSQu Wenruo 162422b398eeSQu Wenruo /* Update the page status */ 162522b398eeSQu Wenruo for (i = start_index - first_index; i <= last_index - first_index; i++) { 162622b398eeSQu Wenruo ClearPageChecked(pages[i]); 162722b398eeSQu Wenruo btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); 162822b398eeSQu Wenruo } 162922b398eeSQu Wenruo btrfs_delalloc_release_extents(inode, len); 163022b398eeSQu Wenruo extent_changeset_free(data_reserved); 163122b398eeSQu Wenruo 163222b398eeSQu Wenruo return ret; 163322b398eeSQu Wenruo } 163422b398eeSQu Wenruo 1635e9eec721SQu Wenruo static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, 1636966d879bSQu Wenruo u32 extent_thresh, u64 newer_than, bool do_compress, 1637966d879bSQu Wenruo u64 *last_scanned_ret) 1638e9eec721SQu Wenruo { 1639e9eec721SQu Wenruo struct extent_state *cached_state = NULL; 1640e9eec721SQu Wenruo struct defrag_target_range *entry; 1641e9eec721SQu Wenruo struct defrag_target_range *tmp; 1642e9eec721SQu Wenruo LIST_HEAD(target_list); 1643e9eec721SQu Wenruo struct page **pages; 1644e9eec721SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1645e9eec721SQu Wenruo u64 last_index = (start + len - 1) >> PAGE_SHIFT; 1646e9eec721SQu Wenruo u64 start_index = start >> PAGE_SHIFT; 1647e9eec721SQu Wenruo unsigned int nr_pages = last_index - start_index + 1; 1648e9eec721SQu Wenruo int ret = 0; 1649e9eec721SQu Wenruo int i; 1650e9eec721SQu Wenruo 1651e9eec721SQu Wenruo ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); 1652e9eec721SQu Wenruo ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); 1653e9eec721SQu Wenruo 1654e9eec721SQu Wenruo pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); 1655e9eec721SQu Wenruo if (!pages) 1656e9eec721SQu Wenruo return -ENOMEM; 1657e9eec721SQu Wenruo 1658e9eec721SQu Wenruo /* Prepare all pages */ 1659e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1660e9eec721SQu Wenruo pages[i] = defrag_prepare_one_page(inode, start_index + i); 1661e9eec721SQu Wenruo if (IS_ERR(pages[i])) { 1662e9eec721SQu Wenruo ret = PTR_ERR(pages[i]); 1663e9eec721SQu Wenruo pages[i] = NULL; 1664e9eec721SQu Wenruo goto free_pages; 1665e9eec721SQu Wenruo } 1666e9eec721SQu Wenruo } 1667e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) 16684cb5300bSChris Mason wait_on_page_writeback(pages[i]); 16694cb5300bSChris Mason 1670e9eec721SQu Wenruo /* Lock the pages range */ 1671570eb97bSJosef Bacik lock_extent(&inode->io_tree, start_index << PAGE_SHIFT, 1672e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1673e9eec721SQu Wenruo &cached_state); 1674e9eec721SQu Wenruo /* 1675e9eec721SQu Wenruo * Now we have a consistent view about the extent map, re-check 1676e9eec721SQu Wenruo * which range really needs to be defragged. 1677e9eec721SQu Wenruo * 1678e9eec721SQu Wenruo * And this time we have extent locked already, pass @locked = true 1679e9eec721SQu Wenruo * so that we won't relock the extent range and cause deadlock. 1680e9eec721SQu Wenruo */ 1681e9eec721SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1682e9eec721SQu Wenruo newer_than, do_compress, true, 1683966d879bSQu Wenruo &target_list, last_scanned_ret); 1684e9eec721SQu Wenruo if (ret < 0) 1685e9eec721SQu Wenruo goto unlock_extent; 16864cb5300bSChris Mason 1687e9eec721SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1688e9eec721SQu Wenruo ret = defrag_one_locked_target(inode, entry, pages, nr_pages, 1689e9eec721SQu Wenruo &cached_state); 1690e9eec721SQu Wenruo if (ret < 0) 1691e9eec721SQu Wenruo break; 1692e9eec721SQu Wenruo } 1693e9eec721SQu Wenruo 1694e9eec721SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1695e9eec721SQu Wenruo list_del_init(&entry->list); 1696e9eec721SQu Wenruo kfree(entry); 1697e9eec721SQu Wenruo } 1698e9eec721SQu Wenruo unlock_extent: 1699570eb97bSJosef Bacik unlock_extent(&inode->io_tree, start_index << PAGE_SHIFT, 1700e9eec721SQu Wenruo (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, 1701e9eec721SQu Wenruo &cached_state); 1702e9eec721SQu Wenruo free_pages: 1703e9eec721SQu Wenruo for (i = 0; i < nr_pages; i++) { 1704e9eec721SQu Wenruo if (pages[i]) { 1705e9eec721SQu Wenruo unlock_page(pages[i]); 1706e9eec721SQu Wenruo put_page(pages[i]); 1707e9eec721SQu Wenruo } 1708e9eec721SQu Wenruo } 1709e9eec721SQu Wenruo kfree(pages); 1710e9eec721SQu Wenruo return ret; 1711e9eec721SQu Wenruo } 1712e9eec721SQu Wenruo 1713b18c3ab2SQu Wenruo static int defrag_one_cluster(struct btrfs_inode *inode, 1714b18c3ab2SQu Wenruo struct file_ra_state *ra, 1715b18c3ab2SQu Wenruo u64 start, u32 len, u32 extent_thresh, 1716b18c3ab2SQu Wenruo u64 newer_than, bool do_compress, 1717b18c3ab2SQu Wenruo unsigned long *sectors_defragged, 1718966d879bSQu Wenruo unsigned long max_sectors, 1719966d879bSQu Wenruo u64 *last_scanned_ret) 1720b18c3ab2SQu Wenruo { 1721b18c3ab2SQu Wenruo const u32 sectorsize = inode->root->fs_info->sectorsize; 1722b18c3ab2SQu Wenruo struct defrag_target_range *entry; 1723b18c3ab2SQu Wenruo struct defrag_target_range *tmp; 1724b18c3ab2SQu Wenruo LIST_HEAD(target_list); 1725b18c3ab2SQu Wenruo int ret; 1726b18c3ab2SQu Wenruo 1727b18c3ab2SQu Wenruo ret = defrag_collect_targets(inode, start, len, extent_thresh, 1728b18c3ab2SQu Wenruo newer_than, do_compress, false, 1729966d879bSQu Wenruo &target_list, NULL); 1730b18c3ab2SQu Wenruo if (ret < 0) 1731b18c3ab2SQu Wenruo goto out; 1732b18c3ab2SQu Wenruo 1733b18c3ab2SQu Wenruo list_for_each_entry(entry, &target_list, list) { 1734b18c3ab2SQu Wenruo u32 range_len = entry->len; 1735b18c3ab2SQu Wenruo 1736484167daSQu Wenruo /* Reached or beyond the limit */ 1737c080b414SQu Wenruo if (max_sectors && *sectors_defragged >= max_sectors) { 1738c080b414SQu Wenruo ret = 1; 1739b18c3ab2SQu Wenruo break; 1740c080b414SQu Wenruo } 1741b18c3ab2SQu Wenruo 1742b18c3ab2SQu Wenruo if (max_sectors) 1743b18c3ab2SQu Wenruo range_len = min_t(u32, range_len, 1744b18c3ab2SQu Wenruo (max_sectors - *sectors_defragged) * sectorsize); 1745b18c3ab2SQu Wenruo 1746966d879bSQu Wenruo /* 1747966d879bSQu Wenruo * If defrag_one_range() has updated last_scanned_ret, 1748966d879bSQu Wenruo * our range may already be invalid (e.g. hole punched). 1749966d879bSQu Wenruo * Skip if our range is before last_scanned_ret, as there is 1750966d879bSQu Wenruo * no need to defrag the range anymore. 1751966d879bSQu Wenruo */ 1752966d879bSQu Wenruo if (entry->start + range_len <= *last_scanned_ret) 1753966d879bSQu Wenruo continue; 1754966d879bSQu Wenruo 1755b18c3ab2SQu Wenruo if (ra) 1756b18c3ab2SQu Wenruo page_cache_sync_readahead(inode->vfs_inode.i_mapping, 1757b18c3ab2SQu Wenruo ra, NULL, entry->start >> PAGE_SHIFT, 1758b18c3ab2SQu Wenruo ((entry->start + range_len - 1) >> PAGE_SHIFT) - 1759b18c3ab2SQu Wenruo (entry->start >> PAGE_SHIFT) + 1); 1760b18c3ab2SQu Wenruo /* 1761b18c3ab2SQu Wenruo * Here we may not defrag any range if holes are punched before 1762b18c3ab2SQu Wenruo * we locked the pages. 1763b18c3ab2SQu Wenruo * But that's fine, it only affects the @sectors_defragged 1764b18c3ab2SQu Wenruo * accounting. 1765b18c3ab2SQu Wenruo */ 1766b18c3ab2SQu Wenruo ret = defrag_one_range(inode, entry->start, range_len, 1767966d879bSQu Wenruo extent_thresh, newer_than, do_compress, 1768966d879bSQu Wenruo last_scanned_ret); 1769b18c3ab2SQu Wenruo if (ret < 0) 1770b18c3ab2SQu Wenruo break; 1771484167daSQu Wenruo *sectors_defragged += range_len >> 1772484167daSQu Wenruo inode->root->fs_info->sectorsize_bits; 1773b18c3ab2SQu Wenruo } 1774b18c3ab2SQu Wenruo out: 1775b18c3ab2SQu Wenruo list_for_each_entry_safe(entry, tmp, &target_list, list) { 1776b18c3ab2SQu Wenruo list_del_init(&entry->list); 1777b18c3ab2SQu Wenruo kfree(entry); 1778b18c3ab2SQu Wenruo } 1779966d879bSQu Wenruo if (ret >= 0) 1780966d879bSQu Wenruo *last_scanned_ret = max(*last_scanned_ret, start + len); 1781b18c3ab2SQu Wenruo return ret; 1782b18c3ab2SQu Wenruo } 17837f458a38SFilipe Manana 17847f458a38SFilipe Manana /* 17851ccc2e8aSQu Wenruo * Entry point to file defragmentation. 17861ccc2e8aSQu Wenruo * 17871ccc2e8aSQu Wenruo * @inode: inode to be defragged 17881ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 17891ccc2e8aSQu Wenruo * @range: defrag options including range and flags 17901ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 17911ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 17921ccc2e8aSQu Wenruo * will be defragged. 1793484167daSQu Wenruo * 1794484167daSQu Wenruo * Return <0 for error. 1795c080b414SQu Wenruo * Return >=0 for the number of sectors defragged, and range->start will be updated 1796c080b414SQu Wenruo * to indicate the file offset where next defrag should be started at. 1797c080b414SQu Wenruo * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without 1798c080b414SQu Wenruo * defragging all the range). 17997f458a38SFilipe Manana */ 18001ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 18014cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 18024cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 18034cb5300bSChris Mason { 18040b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 18057b508037SQu Wenruo unsigned long sectors_defragged = 0; 1806151a31b2SLi Zefan u64 isize = i_size_read(inode); 18077b508037SQu Wenruo u64 cur; 18087b508037SQu Wenruo u64 last_byte; 18091e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 18101ccc2e8aSQu Wenruo bool ra_allocated = false; 18117b508037SQu Wenruo int compress_type = BTRFS_COMPRESS_ZLIB; 18127b508037SQu Wenruo int ret = 0; 18137b508037SQu Wenruo u32 extent_thresh = range->extent_thresh; 181427cdfde1SFilipe Manana pgoff_t start_index; 18154cb5300bSChris Mason 18160abd5b17SLiu Bo if (isize == 0) 18170abd5b17SLiu Bo return 0; 18180abd5b17SLiu Bo 18190abd5b17SLiu Bo if (range->start >= isize) 18200abd5b17SLiu Bo return -EINVAL; 18211a419d85SLi Zefan 18221e2ef46dSDavid Sterba if (do_compress) { 1823ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 18241a419d85SLi Zefan return -EINVAL; 18251a419d85SLi Zefan if (range->compress_type) 18261a419d85SLi Zefan compress_type = range->compress_type; 18271a419d85SLi Zefan } 1828f46b5a66SChristoph Hellwig 18290abd5b17SLiu Bo if (extent_thresh == 0) 1830ee22184bSByongho Lee extent_thresh = SZ_256K; 1831f46b5a66SChristoph Hellwig 18327b508037SQu Wenruo if (range->start + range->len > range->start) { 18337b508037SQu Wenruo /* Got a specific range */ 18346b34cd8eSFilipe Manana last_byte = min(isize, range->start + range->len); 18357b508037SQu Wenruo } else { 18367b508037SQu Wenruo /* Defrag until file end */ 18376b34cd8eSFilipe Manana last_byte = isize; 18387b508037SQu Wenruo } 18397b508037SQu Wenruo 18406b34cd8eSFilipe Manana /* Align the range */ 18416b34cd8eSFilipe Manana cur = round_down(range->start, fs_info->sectorsize); 18426b34cd8eSFilipe Manana last_byte = round_up(last_byte, fs_info->sectorsize) - 1; 18436b34cd8eSFilipe Manana 18444cb5300bSChris Mason /* 18451ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 18460a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 18470a52d108SDavid Sterba * we don't error out. 18484cb5300bSChris Mason */ 18491ccc2e8aSQu Wenruo if (!ra) { 18501ccc2e8aSQu Wenruo ra_allocated = true; 185163e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 18520a52d108SDavid Sterba if (ra) 18534cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 18544cb5300bSChris Mason } 18554cb5300bSChris Mason 185627cdfde1SFilipe Manana /* 185727cdfde1SFilipe Manana * Make writeback start from the beginning of the range, so that the 185827cdfde1SFilipe Manana * defrag range can be written sequentially. 185927cdfde1SFilipe Manana */ 186027cdfde1SFilipe Manana start_index = cur >> PAGE_SHIFT; 186127cdfde1SFilipe Manana if (start_index < inode->i_mapping->writeback_index) 186227cdfde1SFilipe Manana inode->i_mapping->writeback_index = start_index; 186327cdfde1SFilipe Manana 18647b508037SQu Wenruo while (cur < last_byte) { 18653c9d31c7SFilipe Manana const unsigned long prev_sectors_defragged = sectors_defragged; 1866966d879bSQu Wenruo u64 last_scanned = cur; 18677b508037SQu Wenruo u64 cluster_end; 18681e701a32SChris Mason 1869b767c2fcSFilipe Manana if (btrfs_defrag_cancelled(fs_info)) { 1870b767c2fcSFilipe Manana ret = -EAGAIN; 1871b767c2fcSFilipe Manana break; 1872b767c2fcSFilipe Manana } 1873b767c2fcSFilipe Manana 18747b508037SQu Wenruo /* We want the cluster end at page boundary when possible */ 18757b508037SQu Wenruo cluster_end = (((cur >> PAGE_SHIFT) + 18767b508037SQu Wenruo (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; 18777b508037SQu Wenruo cluster_end = min(cluster_end, last_byte); 18784cb5300bSChris Mason 187964708539SJosef Bacik btrfs_inode_lock(inode, 0); 1880eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1881eede2bf3SOmar Sandoval ret = -ETXTBSY; 18827b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18837b508037SQu Wenruo break; 18847b508037SQu Wenruo } 18857b508037SQu Wenruo if (!(inode->i_sb->s_flags & SB_ACTIVE)) { 18867b508037SQu Wenruo btrfs_inode_unlock(inode, 0); 18877b508037SQu Wenruo break; 18887b508037SQu Wenruo } 18891e2ef46dSDavid Sterba if (do_compress) 1890eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 18917b508037SQu Wenruo ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, 18927b508037SQu Wenruo cluster_end + 1 - cur, extent_thresh, 1893966d879bSQu Wenruo newer_than, do_compress, §ors_defragged, 1894966d879bSQu Wenruo max_to_defrag, &last_scanned); 18953c9d31c7SFilipe Manana 18963c9d31c7SFilipe Manana if (sectors_defragged > prev_sectors_defragged) 18973c9d31c7SFilipe Manana balance_dirty_pages_ratelimited(inode->i_mapping); 18983c9d31c7SFilipe Manana 189964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 19007b508037SQu Wenruo if (ret < 0) 19014cb5300bSChris Mason break; 1902966d879bSQu Wenruo cur = max(cluster_end + 1, last_scanned); 1903c080b414SQu Wenruo if (ret > 0) { 1904c080b414SQu Wenruo ret = 0; 1905c080b414SQu Wenruo break; 1906c080b414SQu Wenruo } 1907ea0eba69SQu Wenruo cond_resched(); 19084cb5300bSChris Mason } 1909f46b5a66SChristoph Hellwig 19107b508037SQu Wenruo if (ra_allocated) 19117b508037SQu Wenruo kfree(ra); 1912c080b414SQu Wenruo /* 1913c080b414SQu Wenruo * Update range.start for autodefrag, this will indicate where to start 1914c080b414SQu Wenruo * in next run. 1915c080b414SQu Wenruo */ 1916c080b414SQu Wenruo range->start = cur; 19177b508037SQu Wenruo if (sectors_defragged) { 19187b508037SQu Wenruo /* 19197b508037SQu Wenruo * We have defragged some sectors, for compression case they 19207b508037SQu Wenruo * need to be written back immediately. 19217b508037SQu Wenruo */ 19227b508037SQu Wenruo if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { 19231e701a32SChris Mason filemap_flush(inode->i_mapping); 1924dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1925dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1926dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1927dec8ef90SFilipe Manana } 19287b508037SQu Wenruo if (range->compress_type == BTRFS_COMPRESS_LZO) 19290b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 19307b508037SQu Wenruo else if (range->compress_type == BTRFS_COMPRESS_ZSTD) 19315c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 19327b508037SQu Wenruo ret = sectors_defragged; 19331a419d85SLi Zefan } 19341e2ef46dSDavid Sterba if (do_compress) { 193564708539SJosef Bacik btrfs_inode_lock(inode, 0); 1936eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 193764708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1938633085c7SFilipe David Borba Manana } 1939940100a4SChris Mason return ret; 1940f46b5a66SChristoph Hellwig } 1941f46b5a66SChristoph Hellwig 194217aaa434SDavid Sterba /* 194317aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 194417aaa434SDavid Sterba * 194517aaa434SDavid Sterba * Return: 194617aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 194717aaa434SDavid Sterba * >0 - normal mode, something else is running, 194817aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 194917aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 195017aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 195117aaa434SDavid Sterba */ 195217aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 195317aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 195417aaa434SDavid Sterba { 195517aaa434SDavid Sterba if (!cancel) { 195617aaa434SDavid Sterba /* Start normal op */ 195717aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 195817aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 195917aaa434SDavid Sterba /* Exclusive operation is now claimed */ 196017aaa434SDavid Sterba return 0; 196117aaa434SDavid Sterba } 196217aaa434SDavid Sterba 196317aaa434SDavid Sterba /* Cancel running op */ 196417aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 196517aaa434SDavid Sterba /* 196617aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 196717aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 196817aaa434SDavid Sterba * or it has finished and no waiting will happen. 196917aaa434SDavid Sterba */ 197017aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 197117aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 197217aaa434SDavid Sterba 197317aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 197417aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 197517aaa434SDavid Sterba TASK_INTERRUPTIBLE); 197617aaa434SDavid Sterba 197717aaa434SDavid Sterba return -ECANCELED; 197817aaa434SDavid Sterba } 197917aaa434SDavid Sterba 198017aaa434SDavid Sterba /* Something else is running or none */ 198117aaa434SDavid Sterba return -ENOTCONN; 198217aaa434SDavid Sterba } 198317aaa434SDavid Sterba 1984198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 198576dda93cSYan, Zheng void __user *arg) 1986f46b5a66SChristoph Hellwig { 1987562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 19880b246afaSJeff Mahoney struct inode *inode = file_inode(file); 19890b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1990f46b5a66SChristoph Hellwig u64 new_size; 1991f46b5a66SChristoph Hellwig u64 old_size; 1992f46b5a66SChristoph Hellwig u64 devid = 1; 19930b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1994f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1995f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1996f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1997f46b5a66SChristoph Hellwig char *sizestr; 19989a40f122SGui Hecheng char *retptr; 1999f46b5a66SChristoph Hellwig char *devstr = NULL; 2000f46b5a66SChristoph Hellwig int ret = 0; 2001f46b5a66SChristoph Hellwig int mod = 0; 2002bb059a37SDavid Sterba bool cancel; 2003f46b5a66SChristoph Hellwig 2004e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2005e441d54dSChris Mason return -EPERM; 2006e441d54dSChris Mason 2007198605a8SMiao Xie ret = mnt_want_write_file(file); 2008198605a8SMiao Xie if (ret) 2009198605a8SMiao Xie return ret; 2010198605a8SMiao Xie 2011bb059a37SDavid Sterba /* 2012bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 2013bb059a37SDavid Sterba * distinguish regular resize and cancel 2014bb059a37SDavid Sterba */ 2015dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2016c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 2017c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 2018bb059a37SDavid Sterba goto out_drop; 2019c9e9f97bSIlya Dryomov } 20205516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2021f46b5a66SChristoph Hellwig sizestr = vol_args->name; 2022bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 2023bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 2024bb059a37SDavid Sterba if (ret) 2025bb059a37SDavid Sterba goto out_free; 2026bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 2027bb059a37SDavid Sterba 2028f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 2029f46b5a66SChristoph Hellwig if (devstr) { 2030f46b5a66SChristoph Hellwig sizestr = devstr + 1; 2031f46b5a66SChristoph Hellwig *devstr = '\0'; 2032f46b5a66SChristoph Hellwig devstr = vol_args->name; 203358dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 203458dfae63SZhangZhen if (ret) 2035bb059a37SDavid Sterba goto out_finish; 2036dfd79829SMiao Xie if (!devid) { 2037dfd79829SMiao Xie ret = -EINVAL; 2038bb059a37SDavid Sterba goto out_finish; 2039dfd79829SMiao Xie } 20400b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 2041f46b5a66SChristoph Hellwig } 2042dba60f3fSMiao Xie 2043562d7b15SJosef Bacik args.devid = devid; 2044562d7b15SJosef Bacik device = btrfs_find_device(fs_info->fs_devices, &args); 2045f46b5a66SChristoph Hellwig if (!device) { 20460b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 2047c1c9ff7cSGeert Uytterhoeven devid); 2048dfd79829SMiao Xie ret = -ENODEV; 2049bb059a37SDavid Sterba goto out_finish; 2050f46b5a66SChristoph Hellwig } 2051dba60f3fSMiao Xie 2052ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 20530b246afaSJeff Mahoney btrfs_info(fs_info, 2054efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 2055c1c9ff7cSGeert Uytterhoeven devid); 2056dfd79829SMiao Xie ret = -EPERM; 2057bb059a37SDavid Sterba goto out_finish; 20584e42ae1bSLiu Bo } 20594e42ae1bSLiu Bo 2060f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 2061cda00ebaSChristoph Hellwig new_size = bdev_nr_bytes(device->bdev); 2062f46b5a66SChristoph Hellwig else { 2063f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 2064f46b5a66SChristoph Hellwig mod = -1; 2065f46b5a66SChristoph Hellwig sizestr++; 2066f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 2067f46b5a66SChristoph Hellwig mod = 1; 2068f46b5a66SChristoph Hellwig sizestr++; 2069f46b5a66SChristoph Hellwig } 20709a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 20719a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 2072f46b5a66SChristoph Hellwig ret = -EINVAL; 2073bb059a37SDavid Sterba goto out_finish; 2074f46b5a66SChristoph Hellwig } 2075f46b5a66SChristoph Hellwig } 2076f46b5a66SChristoph Hellwig 2077401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 2078dfd79829SMiao Xie ret = -EPERM; 2079bb059a37SDavid Sterba goto out_finish; 208063a212abSStefan Behrens } 208163a212abSStefan Behrens 20827cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 2083f46b5a66SChristoph Hellwig 2084f46b5a66SChristoph Hellwig if (mod < 0) { 2085f46b5a66SChristoph Hellwig if (new_size > old_size) { 2086f46b5a66SChristoph Hellwig ret = -EINVAL; 2087bb059a37SDavid Sterba goto out_finish; 2088f46b5a66SChristoph Hellwig } 2089f46b5a66SChristoph Hellwig new_size = old_size - new_size; 2090f46b5a66SChristoph Hellwig } else if (mod > 0) { 2091eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 2092902c68a4SGui Hecheng ret = -ERANGE; 2093bb059a37SDavid Sterba goto out_finish; 2094eb8052e0SWenliang Fan } 2095f46b5a66SChristoph Hellwig new_size = old_size + new_size; 2096f46b5a66SChristoph Hellwig } 2097f46b5a66SChristoph Hellwig 2098ee22184bSByongho Lee if (new_size < SZ_256M) { 2099f46b5a66SChristoph Hellwig ret = -EINVAL; 2100bb059a37SDavid Sterba goto out_finish; 2101f46b5a66SChristoph Hellwig } 2102cda00ebaSChristoph Hellwig if (new_size > bdev_nr_bytes(device->bdev)) { 2103f46b5a66SChristoph Hellwig ret = -EFBIG; 2104bb059a37SDavid Sterba goto out_finish; 2105f46b5a66SChristoph Hellwig } 2106f46b5a66SChristoph Hellwig 210747f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 2108f46b5a66SChristoph Hellwig 2109f46b5a66SChristoph Hellwig if (new_size > old_size) { 2110a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 211198d5dc13STsutomu Itoh if (IS_ERR(trans)) { 211298d5dc13STsutomu Itoh ret = PTR_ERR(trans); 2113bb059a37SDavid Sterba goto out_finish; 211498d5dc13STsutomu Itoh } 2115f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 21163a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 2117ece7d20eSMike Fleetwood } else if (new_size < old_size) { 2118f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 21190253f40eSjeff.liu } /* equal, nothing need to do */ 2120f46b5a66SChristoph Hellwig 2121faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 2122faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 2123faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 2124faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 2125faf8f7b9SMarcos Paulo de Souza old_size, new_size); 2126bb059a37SDavid Sterba out_finish: 2127bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 2128c9e9f97bSIlya Dryomov out_free: 2129f46b5a66SChristoph Hellwig kfree(vol_args); 2130bb059a37SDavid Sterba out_drop: 213118f39c41SIlya Dryomov mnt_drop_write_file(file); 2132f46b5a66SChristoph Hellwig return ret; 2133f46b5a66SChristoph Hellwig } 2134f46b5a66SChristoph Hellwig 21355d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 21364d4340c9SChristian Brauner struct user_namespace *mnt_userns, 213752f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 21385d54c67eSNikolay Borisov bool readonly, 21398696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 2140f46b5a66SChristoph Hellwig { 2141f46b5a66SChristoph Hellwig int namelen; 21423de4586cSChris Mason int ret = 0; 2143f46b5a66SChristoph Hellwig 2144325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2145325c50e3SJeff Mahoney return -ENOTDIR; 2146325c50e3SJeff Mahoney 2147a874a63eSLiu Bo ret = mnt_want_write_file(file); 2148a874a63eSLiu Bo if (ret) 2149a874a63eSLiu Bo goto out; 2150a874a63eSLiu Bo 215172fd032eSSage Weil namelen = strlen(name); 215272fd032eSSage Weil if (strchr(name, '/')) { 2153f46b5a66SChristoph Hellwig ret = -EINVAL; 2154a874a63eSLiu Bo goto out_drop_write; 2155f46b5a66SChristoph Hellwig } 2156f46b5a66SChristoph Hellwig 215716780cabSChris Mason if (name[0] == '.' && 215816780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 215916780cabSChris Mason ret = -EEXIST; 2160a874a63eSLiu Bo goto out_drop_write; 216116780cabSChris Mason } 216216780cabSChris Mason 21633de4586cSChris Mason if (subvol) { 21644d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 21654d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 2166cb8e7090SChristoph Hellwig } else { 21672903ff01SAl Viro struct fd src = fdget(fd); 21683de4586cSChris Mason struct inode *src_inode; 21692903ff01SAl Viro if (!src.file) { 21703de4586cSChris Mason ret = -EINVAL; 2171a874a63eSLiu Bo goto out_drop_write; 21723de4586cSChris Mason } 21733de4586cSChris Mason 2174496ad9aaSAl Viro src_inode = file_inode(src.file); 2175496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2176c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2177efe120a0SFrank Holton "Snapshot src from another FS"); 217823ad5b17SKusanagi Kouichi ret = -EXDEV; 21794d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2180d0242061SDavid Sterba /* 2181d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2182d0242061SDavid Sterba * are limited to own subvolumes only 2183d0242061SDavid Sterba */ 2184d0242061SDavid Sterba ret = -EPERM; 2185ecd18815SAl Viro } else { 21864d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 21874d4340c9SChristian Brauner name, namelen, 218872fd032eSSage Weil BTRFS_I(src_inode)->root, 21895d54c67eSNikolay Borisov readonly, inherit); 2190ecd18815SAl Viro } 21912903ff01SAl Viro fdput(src); 2192cb8e7090SChristoph Hellwig } 2193a874a63eSLiu Bo out_drop_write: 2194a874a63eSLiu Bo mnt_drop_write_file(file); 2195f46b5a66SChristoph Hellwig out: 219672fd032eSSage Weil return ret; 219772fd032eSSage Weil } 219872fd032eSSage Weil 219972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2200fa0d2b9bSLi Zefan void __user *arg, int subvol) 220172fd032eSSage Weil { 2202fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 220372fd032eSSage Weil int ret; 220472fd032eSSage Weil 2205325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2206325c50e3SJeff Mahoney return -ENOTDIR; 2207325c50e3SJeff Mahoney 2208fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2209fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2210fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2211fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2212fa0d2b9bSLi Zefan 22134d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22144d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22154d4340c9SChristian Brauner false, NULL); 2216fa0d2b9bSLi Zefan 2217fa0d2b9bSLi Zefan kfree(vol_args); 2218fa0d2b9bSLi Zefan return ret; 2219fa0d2b9bSLi Zefan } 2220fa0d2b9bSLi Zefan 2221fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2222fa0d2b9bSLi Zefan void __user *arg, int subvol) 2223fa0d2b9bSLi Zefan { 2224fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2225fa0d2b9bSLi Zefan int ret; 2226b83cc969SLi Zefan bool readonly = false; 22276f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 222872fd032eSSage Weil 2229325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2230325c50e3SJeff Mahoney return -ENOTDIR; 2231325c50e3SJeff Mahoney 2232fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2233fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2234fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2235fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2236fdfb1e4fSLi Zefan 2237673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2238b83cc969SLi Zefan ret = -EOPNOTSUPP; 2239c47ca32dSDan Carpenter goto free_args; 2240fdfb1e4fSLi Zefan } 2241fdfb1e4fSLi Zefan 2242b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2243b83cc969SLi Zefan readonly = true; 22446f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 22455011c5a6SDan Carpenter u64 nums; 22465011c5a6SDan Carpenter 22475011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 22485011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 22496f72c7e2SArne Jansen ret = -EINVAL; 2250c47ca32dSDan Carpenter goto free_args; 22516f72c7e2SArne Jansen } 22526f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 22536f72c7e2SArne Jansen if (IS_ERR(inherit)) { 22546f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2255c47ca32dSDan Carpenter goto free_args; 22566f72c7e2SArne Jansen } 22575011c5a6SDan Carpenter 22585011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 22595011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 22605011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 22615011c5a6SDan Carpenter ret = -EINVAL; 22625011c5a6SDan Carpenter goto free_inherit; 22635011c5a6SDan Carpenter } 22645011c5a6SDan Carpenter 22655011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 22665011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 22675011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 22685011c5a6SDan Carpenter ret = -EINVAL; 22695011c5a6SDan Carpenter goto free_inherit; 22705011c5a6SDan Carpenter } 22716f72c7e2SArne Jansen } 227275eaa0e2SSage Weil 22734d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 22744d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 22754d4340c9SChristian Brauner readonly, inherit); 2276c47ca32dSDan Carpenter if (ret) 2277c47ca32dSDan Carpenter goto free_inherit; 2278c47ca32dSDan Carpenter free_inherit: 22796f72c7e2SArne Jansen kfree(inherit); 2280c47ca32dSDan Carpenter free_args: 2281c47ca32dSDan Carpenter kfree(vol_args); 2282f46b5a66SChristoph Hellwig return ret; 2283f46b5a66SChristoph Hellwig } 2284f46b5a66SChristoph Hellwig 22859ad12305SSahil Kang static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, 22860caa102dSLi Zefan void __user *arg) 22870caa102dSLi Zefan { 22880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 22890caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 22900caa102dSLi Zefan int ret = 0; 22910caa102dSLi Zefan u64 flags = 0; 22920caa102dSLi Zefan 22934a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 22940caa102dSLi Zefan return -EINVAL; 22950caa102dSLi Zefan 22960b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 22970caa102dSLi Zefan if (btrfs_root_readonly(root)) 22980caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 22990b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 23000caa102dSLi Zefan 23010caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 23020caa102dSLi Zefan ret = -EFAULT; 23030caa102dSLi Zefan 23040caa102dSLi Zefan return ret; 23050caa102dSLi Zefan } 23060caa102dSLi Zefan 23070caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 23080caa102dSLi Zefan void __user *arg) 23090caa102dSLi Zefan { 2310496ad9aaSAl Viro struct inode *inode = file_inode(file); 23110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 23120caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 23130caa102dSLi Zefan struct btrfs_trans_handle *trans; 23140caa102dSLi Zefan u64 root_flags; 23150caa102dSLi Zefan u64 flags; 23160caa102dSLi Zefan int ret = 0; 23170caa102dSLi Zefan 231839e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2319bd60ea0fSDavid Sterba return -EPERM; 2320bd60ea0fSDavid Sterba 2321b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2322b9ca0664SLiu Bo if (ret) 2323b9ca0664SLiu Bo goto out; 23240caa102dSLi Zefan 23254a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2326b9ca0664SLiu Bo ret = -EINVAL; 2327b9ca0664SLiu Bo goto out_drop_write; 2328b9ca0664SLiu Bo } 23290caa102dSLi Zefan 2330b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2331b9ca0664SLiu Bo ret = -EFAULT; 2332b9ca0664SLiu Bo goto out_drop_write; 2333b9ca0664SLiu Bo } 23340caa102dSLi Zefan 2335b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2336b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2337b9ca0664SLiu Bo goto out_drop_write; 2338b9ca0664SLiu Bo } 23390caa102dSLi Zefan 23400b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 23410caa102dSLi Zefan 23420caa102dSLi Zefan /* nothing to do */ 23430caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2344b9ca0664SLiu Bo goto out_drop_sem; 23450caa102dSLi Zefan 23460caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 23472c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 23480caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23490caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 23502c686537SDavid Sterba } else { 23512c686537SDavid Sterba /* 23522c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 23532c686537SDavid Sterba * send 23542c686537SDavid Sterba */ 23552c686537SDavid Sterba spin_lock(&root->root_item_lock); 23562c686537SDavid Sterba if (root->send_in_progress == 0) { 23570caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 23580caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 23592c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23602c686537SDavid Sterba } else { 23612c686537SDavid Sterba spin_unlock(&root->root_item_lock); 23620b246afaSJeff Mahoney btrfs_warn(fs_info, 23632c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 23642c686537SDavid Sterba root->root_key.objectid); 23652c686537SDavid Sterba ret = -EPERM; 23662c686537SDavid Sterba goto out_drop_sem; 23672c686537SDavid Sterba } 23682c686537SDavid Sterba } 23690caa102dSLi Zefan 23700caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 23710caa102dSLi Zefan if (IS_ERR(trans)) { 23720caa102dSLi Zefan ret = PTR_ERR(trans); 23730caa102dSLi Zefan goto out_reset; 23740caa102dSLi Zefan } 23750caa102dSLi Zefan 23760b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 23770caa102dSLi Zefan &root->root_key, &root->root_item); 23789417ebc8SNikolay Borisov if (ret < 0) { 23799417ebc8SNikolay Borisov btrfs_end_transaction(trans); 23809417ebc8SNikolay Borisov goto out_reset; 23819417ebc8SNikolay Borisov } 23820caa102dSLi Zefan 23839417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 23849417ebc8SNikolay Borisov 23850caa102dSLi Zefan out_reset: 23860caa102dSLi Zefan if (ret) 23870caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2388b9ca0664SLiu Bo out_drop_sem: 23890b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2390b9ca0664SLiu Bo out_drop_write: 2391b9ca0664SLiu Bo mnt_drop_write_file(file); 2392b9ca0664SLiu Bo out: 23930caa102dSLi Zefan return ret; 23940caa102dSLi Zefan } 23950caa102dSLi Zefan 2396ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2397ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2398ac8e9819SChris Mason { 2399abc6e134SChris Mason struct btrfs_key test; 2400abc6e134SChris Mason int ret; 2401abc6e134SChris Mason 2402abc6e134SChris Mason test.objectid = sk->min_objectid; 2403abc6e134SChris Mason test.type = sk->min_type; 2404abc6e134SChris Mason test.offset = sk->min_offset; 2405abc6e134SChris Mason 2406abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2407abc6e134SChris Mason if (ret < 0) 2408ac8e9819SChris Mason return 0; 2409abc6e134SChris Mason 2410abc6e134SChris Mason test.objectid = sk->max_objectid; 2411abc6e134SChris Mason test.type = sk->max_type; 2412abc6e134SChris Mason test.offset = sk->max_offset; 2413abc6e134SChris Mason 2414abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2415abc6e134SChris Mason if (ret > 0) 2416ac8e9819SChris Mason return 0; 2417ac8e9819SChris Mason return 1; 2418ac8e9819SChris Mason } 2419ac8e9819SChris Mason 2420df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2421ac8e9819SChris Mason struct btrfs_key *key, 2422ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 24239b6e817dSGerhard Heift size_t *buf_size, 2424ba346b35SGerhard Heift char __user *ubuf, 2425ac8e9819SChris Mason unsigned long *sk_offset, 2426ac8e9819SChris Mason int *num_found) 2427ac8e9819SChris Mason { 2428ac8e9819SChris Mason u64 found_transid; 2429ac8e9819SChris Mason struct extent_buffer *leaf; 2430ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2431dd81d459SNaohiro Aota struct btrfs_key test; 2432ac8e9819SChris Mason unsigned long item_off; 2433ac8e9819SChris Mason unsigned long item_len; 2434ac8e9819SChris Mason int nritems; 2435ac8e9819SChris Mason int i; 2436ac8e9819SChris Mason int slot; 2437ac8e9819SChris Mason int ret = 0; 2438ac8e9819SChris Mason 2439ac8e9819SChris Mason leaf = path->nodes[0]; 2440ac8e9819SChris Mason slot = path->slots[0]; 2441ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2442ac8e9819SChris Mason 2443ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2444ac8e9819SChris Mason i = nritems; 2445ac8e9819SChris Mason goto advance_key; 2446ac8e9819SChris Mason } 2447ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2448ac8e9819SChris Mason 2449ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2450ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 24513212fa14SJosef Bacik item_len = btrfs_item_size(leaf, i); 2452ac8e9819SChris Mason 245303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 245403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 245503b71c6cSGabriel de Perthuis continue; 245603b71c6cSGabriel de Perthuis 24579b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 24588f5f6178SGerhard Heift if (*num_found) { 2459ac8e9819SChris Mason ret = 1; 24608f5f6178SGerhard Heift goto out; 24618f5f6178SGerhard Heift } 24628f5f6178SGerhard Heift 24638f5f6178SGerhard Heift /* 24648f5f6178SGerhard Heift * return one empty item back for v1, which does not 24658f5f6178SGerhard Heift * handle -EOVERFLOW 24668f5f6178SGerhard Heift */ 24678f5f6178SGerhard Heift 24689b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2469ac8e9819SChris Mason item_len = 0; 24708f5f6178SGerhard Heift ret = -EOVERFLOW; 24718f5f6178SGerhard Heift } 2472ac8e9819SChris Mason 24739b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2474ac8e9819SChris Mason ret = 1; 247525c9bc2eSGerhard Heift goto out; 2476ac8e9819SChris Mason } 2477ac8e9819SChris Mason 2478ac8e9819SChris Mason sh.objectid = key->objectid; 2479ac8e9819SChris Mason sh.offset = key->offset; 2480ac8e9819SChris Mason sh.type = key->type; 2481ac8e9819SChris Mason sh.len = item_len; 2482ac8e9819SChris Mason sh.transid = found_transid; 2483ac8e9819SChris Mason 2484a48b73ecSJosef Bacik /* 2485a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2486a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2487a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2488a48b73ecSJosef Bacik * properly this next time through 2489a48b73ecSJosef Bacik */ 2490a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2491a48b73ecSJosef Bacik ret = 0; 2492ba346b35SGerhard Heift goto out; 2493ba346b35SGerhard Heift } 2494ba346b35SGerhard Heift 2495ac8e9819SChris Mason *sk_offset += sizeof(sh); 2496ac8e9819SChris Mason 2497ac8e9819SChris Mason if (item_len) { 2498ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2499a48b73ecSJosef Bacik /* 2500a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2501a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2502a48b73ecSJosef Bacik */ 2503a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2504ba346b35SGerhard Heift item_off, item_len)) { 2505a48b73ecSJosef Bacik ret = 0; 2506a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2507ba346b35SGerhard Heift goto out; 2508ba346b35SGerhard Heift } 2509ba346b35SGerhard Heift 2510ac8e9819SChris Mason *sk_offset += item_len; 2511ac8e9819SChris Mason } 2512e2156867SHugo Mills (*num_found)++; 2513ac8e9819SChris Mason 25148f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 25158f5f6178SGerhard Heift goto out; 25168f5f6178SGerhard Heift 251725c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 251825c9bc2eSGerhard Heift ret = 1; 251925c9bc2eSGerhard Heift goto out; 252025c9bc2eSGerhard Heift } 2521ac8e9819SChris Mason } 2522ac8e9819SChris Mason advance_key: 2523ac8e9819SChris Mason ret = 0; 2524dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2525dd81d459SNaohiro Aota test.type = sk->max_type; 2526dd81d459SNaohiro Aota test.offset = sk->max_offset; 2527dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2528dd81d459SNaohiro Aota ret = 1; 2529dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2530abc6e134SChris Mason key->offset++; 2531dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2532abc6e134SChris Mason key->offset = 0; 2533abc6e134SChris Mason key->type++; 2534dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2535abc6e134SChris Mason key->offset = 0; 2536abc6e134SChris Mason key->type = 0; 2537abc6e134SChris Mason key->objectid++; 2538abc6e134SChris Mason } else 2539abc6e134SChris Mason ret = 1; 254025c9bc2eSGerhard Heift out: 2541ba346b35SGerhard Heift /* 2542ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2543ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2544ba346b35SGerhard Heift * * all items were found 2545ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2546ba346b35SGerhard Heift * leaf 2547ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2548ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2549ba346b35SGerhard Heift */ 2550ac8e9819SChris Mason return ret; 2551ac8e9819SChris Mason } 2552ac8e9819SChris Mason 2553ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 255412544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 25559b6e817dSGerhard Heift size_t *buf_size, 2556ba346b35SGerhard Heift char __user *ubuf) 2557ac8e9819SChris Mason { 25580b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2559ac8e9819SChris Mason struct btrfs_root *root; 2560ac8e9819SChris Mason struct btrfs_key key; 2561ac8e9819SChris Mason struct btrfs_path *path; 2562ac8e9819SChris Mason int ret; 2563ac8e9819SChris Mason int num_found = 0; 2564ac8e9819SChris Mason unsigned long sk_offset = 0; 2565ac8e9819SChris Mason 25669b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 25679b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 256812544442SGerhard Heift return -EOVERFLOW; 25699b6e817dSGerhard Heift } 257012544442SGerhard Heift 2571ac8e9819SChris Mason path = btrfs_alloc_path(); 2572ac8e9819SChris Mason if (!path) 2573ac8e9819SChris Mason return -ENOMEM; 2574ac8e9819SChris Mason 2575ac8e9819SChris Mason if (sk->tree_id == 0) { 2576ac8e9819SChris Mason /* search the root of the inode that was passed */ 257700246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2578ac8e9819SChris Mason } else { 257956e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2580ac8e9819SChris Mason if (IS_ERR(root)) { 2581ac8e9819SChris Mason btrfs_free_path(path); 2582ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2583ac8e9819SChris Mason } 2584ac8e9819SChris Mason } 2585ac8e9819SChris Mason 2586ac8e9819SChris Mason key.objectid = sk->min_objectid; 2587ac8e9819SChris Mason key.type = sk->min_type; 2588ac8e9819SChris Mason key.offset = sk->min_offset; 2589ac8e9819SChris Mason 2590ac8e9819SChris Mason while (1) { 2591bb523b40SAndreas Gruenbacher ret = -EFAULT; 259218788e34SCatalin Marinas /* 259318788e34SCatalin Marinas * Ensure that the whole user buffer is faulted in at sub-page 259418788e34SCatalin Marinas * granularity, otherwise the loop may live-lock. 259518788e34SCatalin Marinas */ 259618788e34SCatalin Marinas if (fault_in_subpage_writeable(ubuf + sk_offset, 259718788e34SCatalin Marinas *buf_size - sk_offset)) 2598a48b73ecSJosef Bacik break; 2599a48b73ecSJosef Bacik 26006174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2601ac8e9819SChris Mason if (ret != 0) { 2602ac8e9819SChris Mason if (ret > 0) 2603ac8e9819SChris Mason ret = 0; 2604ac8e9819SChris Mason goto err; 2605ac8e9819SChris Mason } 2606df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2607ac8e9819SChris Mason &sk_offset, &num_found); 2608b3b4aa74SDavid Sterba btrfs_release_path(path); 260925c9bc2eSGerhard Heift if (ret) 2610ac8e9819SChris Mason break; 2611ac8e9819SChris Mason 2612ac8e9819SChris Mason } 26138f5f6178SGerhard Heift if (ret > 0) 2614ac8e9819SChris Mason ret = 0; 2615ac8e9819SChris Mason err: 2616ac8e9819SChris Mason sk->nr_items = num_found; 261700246528SJosef Bacik btrfs_put_root(root); 2618ac8e9819SChris Mason btrfs_free_path(path); 2619ac8e9819SChris Mason return ret; 2620ac8e9819SChris Mason } 2621ac8e9819SChris Mason 26229ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search(struct inode *inode, 2623ac8e9819SChris Mason void __user *argp) 2624ac8e9819SChris Mason { 26250d031dc4SYu Zhe struct btrfs_ioctl_search_args __user *uargs = argp; 2626ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2627ac8e9819SChris Mason int ret; 26289b6e817dSGerhard Heift size_t buf_size; 2629ac8e9819SChris Mason 2630ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2631ac8e9819SChris Mason return -EPERM; 2632ac8e9819SChris Mason 2633ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2634ba346b35SGerhard Heift return -EFAULT; 2635ba346b35SGerhard Heift 2636ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2637ac8e9819SChris Mason 2638ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 26398f5f6178SGerhard Heift 26408f5f6178SGerhard Heift /* 26418f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 26428f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 26438f5f6178SGerhard Heift */ 26448f5f6178SGerhard Heift if (ret == -EOVERFLOW) 26458f5f6178SGerhard Heift ret = 0; 26468f5f6178SGerhard Heift 2647ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2648ac8e9819SChris Mason ret = -EFAULT; 2649ac8e9819SChris Mason return ret; 2650ac8e9819SChris Mason } 2651ac8e9819SChris Mason 26529ad12305SSahil Kang static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, 2653cc68a8a5SGerhard Heift void __user *argp) 2654cc68a8a5SGerhard Heift { 26550d031dc4SYu Zhe struct btrfs_ioctl_search_args_v2 __user *uarg = argp; 2656cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2657cc68a8a5SGerhard Heift int ret; 2658cc68a8a5SGerhard Heift size_t buf_size; 2659ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2660cc68a8a5SGerhard Heift 2661cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2662cc68a8a5SGerhard Heift return -EPERM; 2663cc68a8a5SGerhard Heift 2664cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2665cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2666cc68a8a5SGerhard Heift return -EFAULT; 2667cc68a8a5SGerhard Heift 2668cc68a8a5SGerhard Heift buf_size = args.buf_size; 2669cc68a8a5SGerhard Heift 2670cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2671cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2672cc68a8a5SGerhard Heift buf_size = buf_limit; 2673cc68a8a5SGerhard Heift 2674cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2675718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2676cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2677cc68a8a5SGerhard Heift ret = -EFAULT; 2678cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2679cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2680cc68a8a5SGerhard Heift ret = -EFAULT; 2681cc68a8a5SGerhard Heift 268276dda93cSYan, Zheng return ret; 268376dda93cSYan, Zheng } 268476dda93cSYan, Zheng 268598d377a0STARUISI Hiroaki /* 2686ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2687ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 268898d377a0STARUISI Hiroaki */ 268998d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 269098d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 269198d377a0STARUISI Hiroaki { 269298d377a0STARUISI Hiroaki struct btrfs_root *root; 269398d377a0STARUISI Hiroaki struct btrfs_key key; 2694ac8e9819SChris Mason char *ptr; 269598d377a0STARUISI Hiroaki int ret = -1; 269698d377a0STARUISI Hiroaki int slot; 269798d377a0STARUISI Hiroaki int len; 269898d377a0STARUISI Hiroaki int total_len = 0; 269998d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 270098d377a0STARUISI Hiroaki struct extent_buffer *l; 270198d377a0STARUISI Hiroaki struct btrfs_path *path; 270298d377a0STARUISI Hiroaki 270398d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 270498d377a0STARUISI Hiroaki name[0]='\0'; 270598d377a0STARUISI Hiroaki return 0; 270698d377a0STARUISI Hiroaki } 270798d377a0STARUISI Hiroaki 270898d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 270998d377a0STARUISI Hiroaki if (!path) 271098d377a0STARUISI Hiroaki return -ENOMEM; 271198d377a0STARUISI Hiroaki 2712c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 271398d377a0STARUISI Hiroaki 271456e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 271598d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2716ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 271788234012SJosef Bacik root = NULL; 271888234012SJosef Bacik goto out; 271988234012SJosef Bacik } 272098d377a0STARUISI Hiroaki 272198d377a0STARUISI Hiroaki key.objectid = dirid; 272298d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 27238ad6fcabSChris Mason key.offset = (u64)-1; 272498d377a0STARUISI Hiroaki 272598d377a0STARUISI Hiroaki while (1) { 27260ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 272718674c6cSFilipe David Borba Manana if (ret < 0) 272818674c6cSFilipe David Borba Manana goto out; 272918674c6cSFilipe David Borba Manana else if (ret > 0) { 2730ac8e9819SChris Mason ret = -ENOENT; 273198d377a0STARUISI Hiroaki goto out; 2732ac8e9819SChris Mason } 273318674c6cSFilipe David Borba Manana 273418674c6cSFilipe David Borba Manana l = path->nodes[0]; 273518674c6cSFilipe David Borba Manana slot = path->slots[0]; 273698d377a0STARUISI Hiroaki 273798d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 273898d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 273998d377a0STARUISI Hiroaki ptr -= len + 1; 274098d377a0STARUISI Hiroaki total_len += len + 1; 2741a696cf35SFilipe David Borba Manana if (ptr < name) { 2742a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 274398d377a0STARUISI Hiroaki goto out; 2744a696cf35SFilipe David Borba Manana } 274598d377a0STARUISI Hiroaki 274698d377a0STARUISI Hiroaki *(ptr + len) = '/'; 274798d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 274898d377a0STARUISI Hiroaki 274998d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 275098d377a0STARUISI Hiroaki break; 275198d377a0STARUISI Hiroaki 2752b3b4aa74SDavid Sterba btrfs_release_path(path); 275398d377a0STARUISI Hiroaki key.objectid = key.offset; 27548ad6fcabSChris Mason key.offset = (u64)-1; 275598d377a0STARUISI Hiroaki dirid = key.objectid; 275698d377a0STARUISI Hiroaki } 275777906a50SLi Zefan memmove(name, ptr, total_len); 275898d377a0STARUISI Hiroaki name[total_len] = '\0'; 275998d377a0STARUISI Hiroaki ret = 0; 276098d377a0STARUISI Hiroaki out: 276100246528SJosef Bacik btrfs_put_root(root); 276298d377a0STARUISI Hiroaki btrfs_free_path(path); 2763ac8e9819SChris Mason return ret; 2764ac8e9819SChris Mason } 2765ac8e9819SChris Mason 27666623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 27676623d9a0SChristian Brauner struct inode *inode, 276823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 276923d0b79dSTomohiro Misono { 277023d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 277123d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 277223d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 277323d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 277423d0b79dSTomohiro Misono u64 dirid = args->dirid; 277523d0b79dSTomohiro Misono unsigned long item_off; 277623d0b79dSTomohiro Misono unsigned long item_len; 277723d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 277823d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2779b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 278023d0b79dSTomohiro Misono struct btrfs_path *path; 278123d0b79dSTomohiro Misono struct btrfs_key key, key2; 278223d0b79dSTomohiro Misono struct extent_buffer *leaf; 278323d0b79dSTomohiro Misono struct inode *temp_inode; 278423d0b79dSTomohiro Misono char *ptr; 278523d0b79dSTomohiro Misono int slot; 278623d0b79dSTomohiro Misono int len; 278723d0b79dSTomohiro Misono int total_len = 0; 278823d0b79dSTomohiro Misono int ret; 278923d0b79dSTomohiro Misono 279023d0b79dSTomohiro Misono path = btrfs_alloc_path(); 279123d0b79dSTomohiro Misono if (!path) 279223d0b79dSTomohiro Misono return -ENOMEM; 279323d0b79dSTomohiro Misono 279423d0b79dSTomohiro Misono /* 279523d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 279623d0b79dSTomohiro Misono * construct the path in from the bottom up. 279723d0b79dSTomohiro Misono */ 279823d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 279923d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 280023d0b79dSTomohiro Misono 280156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 280223d0b79dSTomohiro Misono if (IS_ERR(root)) { 280323d0b79dSTomohiro Misono ret = PTR_ERR(root); 280423d0b79dSTomohiro Misono goto out; 280523d0b79dSTomohiro Misono } 280623d0b79dSTomohiro Misono 280723d0b79dSTomohiro Misono key.objectid = dirid; 280823d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 280923d0b79dSTomohiro Misono key.offset = (u64)-1; 281023d0b79dSTomohiro Misono while (1) { 28110ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 28120ff40a91SMarcos Paulo de Souza if (ret < 0) 2813b8a49ae1SJosef Bacik goto out_put; 28140ff40a91SMarcos Paulo de Souza else if (ret > 0) { 281523d0b79dSTomohiro Misono ret = -ENOENT; 2816b8a49ae1SJosef Bacik goto out_put; 281723d0b79dSTomohiro Misono } 281823d0b79dSTomohiro Misono 281923d0b79dSTomohiro Misono leaf = path->nodes[0]; 282023d0b79dSTomohiro Misono slot = path->slots[0]; 282123d0b79dSTomohiro Misono 282223d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 282323d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 282423d0b79dSTomohiro Misono ptr -= len + 1; 282523d0b79dSTomohiro Misono total_len += len + 1; 282623d0b79dSTomohiro Misono if (ptr < args->path) { 282723d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2828b8a49ae1SJosef Bacik goto out_put; 282923d0b79dSTomohiro Misono } 283023d0b79dSTomohiro Misono 283123d0b79dSTomohiro Misono *(ptr + len) = '/'; 283223d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 283323d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 283423d0b79dSTomohiro Misono 283523d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 283623d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 283723d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 283823d0b79dSTomohiro Misono if (ret < 0) { 2839b8a49ae1SJosef Bacik goto out_put; 284023d0b79dSTomohiro Misono } else if (ret > 0) { 284123d0b79dSTomohiro Misono ret = -ENOENT; 2842b8a49ae1SJosef Bacik goto out_put; 284323d0b79dSTomohiro Misono } 284423d0b79dSTomohiro Misono 284523d0b79dSTomohiro Misono leaf = path->nodes[0]; 284623d0b79dSTomohiro Misono slot = path->slots[0]; 284723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 284823d0b79dSTomohiro Misono if (key2.objectid != dirid) { 284923d0b79dSTomohiro Misono ret = -ENOENT; 2850b8a49ae1SJosef Bacik goto out_put; 285123d0b79dSTomohiro Misono } 285223d0b79dSTomohiro Misono 28530202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 28543ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 28553ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2856b8a49ae1SJosef Bacik goto out_put; 28573ca57bd6SMisono Tomohiro } 28586623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 285947291baaSChristian Brauner MAY_READ | MAY_EXEC); 286023d0b79dSTomohiro Misono iput(temp_inode); 286123d0b79dSTomohiro Misono if (ret) { 286223d0b79dSTomohiro Misono ret = -EACCES; 2863b8a49ae1SJosef Bacik goto out_put; 286423d0b79dSTomohiro Misono } 286523d0b79dSTomohiro Misono 286623d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 286723d0b79dSTomohiro Misono break; 286823d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 286923d0b79dSTomohiro Misono ret = -EACCES; 2870b8a49ae1SJosef Bacik goto out_put; 287123d0b79dSTomohiro Misono } 287223d0b79dSTomohiro Misono 287323d0b79dSTomohiro Misono btrfs_release_path(path); 287423d0b79dSTomohiro Misono key.objectid = key.offset; 287523d0b79dSTomohiro Misono key.offset = (u64)-1; 287623d0b79dSTomohiro Misono dirid = key.objectid; 287723d0b79dSTomohiro Misono } 287823d0b79dSTomohiro Misono 287923d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 288023d0b79dSTomohiro Misono args->path[total_len] = '\0'; 288100246528SJosef Bacik btrfs_put_root(root); 2882b8a49ae1SJosef Bacik root = NULL; 288323d0b79dSTomohiro Misono btrfs_release_path(path); 288423d0b79dSTomohiro Misono } 288523d0b79dSTomohiro Misono 288623d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 288723d0b79dSTomohiro Misono key.objectid = treeid; 288823d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 288923d0b79dSTomohiro Misono key.offset = args->treeid; 2890b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 289123d0b79dSTomohiro Misono if (ret < 0) { 289223d0b79dSTomohiro Misono goto out; 289323d0b79dSTomohiro Misono } else if (ret > 0) { 289423d0b79dSTomohiro Misono ret = -ENOENT; 289523d0b79dSTomohiro Misono goto out; 289623d0b79dSTomohiro Misono } 289723d0b79dSTomohiro Misono 289823d0b79dSTomohiro Misono leaf = path->nodes[0]; 289923d0b79dSTomohiro Misono slot = path->slots[0]; 290023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 290123d0b79dSTomohiro Misono 290223d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 29033212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot); 290423d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 290523d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 290623d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 290723d0b79dSTomohiro Misono ret = -EINVAL; 290823d0b79dSTomohiro Misono goto out; 290923d0b79dSTomohiro Misono } 291023d0b79dSTomohiro Misono 291123d0b79dSTomohiro Misono /* Copy subvolume's name */ 291223d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 291323d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 291423d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 291523d0b79dSTomohiro Misono args->name[item_len] = 0; 291623d0b79dSTomohiro Misono 2917b8a49ae1SJosef Bacik out_put: 291800246528SJosef Bacik btrfs_put_root(root); 291923d0b79dSTomohiro Misono out: 292023d0b79dSTomohiro Misono btrfs_free_path(path); 292123d0b79dSTomohiro Misono return ret; 292223d0b79dSTomohiro Misono } 292323d0b79dSTomohiro Misono 2924dc408ccdSSahil Kang static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, 2925ac8e9819SChris Mason void __user *argp) 2926ac8e9819SChris Mason { 2927ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 292801b810b8SDavid Sterba int ret = 0; 2929ac8e9819SChris Mason 29302354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 29312354d08fSJulia Lawall if (IS_ERR(args)) 29322354d08fSJulia Lawall return PTR_ERR(args); 2933c2b96929SDan Carpenter 293401b810b8SDavid Sterba /* 293501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 293601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 293701b810b8SDavid Sterba */ 29381b53ac4dSChris Mason if (args->treeid == 0) 2939dc408ccdSSahil Kang args->treeid = root->root_key.objectid; 29401b53ac4dSChris Mason 294101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 294201b810b8SDavid Sterba args->name[0] = 0; 294301b810b8SDavid Sterba goto out; 294401b810b8SDavid Sterba } 294501b810b8SDavid Sterba 294601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 294701b810b8SDavid Sterba ret = -EPERM; 294801b810b8SDavid Sterba goto out; 294901b810b8SDavid Sterba } 295001b810b8SDavid Sterba 2951dc408ccdSSahil Kang ret = btrfs_search_path_in_tree(root->fs_info, 2952ac8e9819SChris Mason args->treeid, args->objectid, 2953ac8e9819SChris Mason args->name); 2954ac8e9819SChris Mason 295501b810b8SDavid Sterba out: 2956ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2957ac8e9819SChris Mason ret = -EFAULT; 2958ac8e9819SChris Mason 2959ac8e9819SChris Mason kfree(args); 296098d377a0STARUISI Hiroaki return ret; 296198d377a0STARUISI Hiroaki } 296298d377a0STARUISI Hiroaki 296323d0b79dSTomohiro Misono /* 296423d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 296523d0b79dSTomohiro Misono * 296623d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 296723d0b79dSTomohiro Misono * 296823d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 296923d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 297023d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 297123d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 297223d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 297323d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 297423d0b79dSTomohiro Misono */ 297523d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 297623d0b79dSTomohiro Misono { 297723d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 297823d0b79dSTomohiro Misono struct inode *inode; 297923d0b79dSTomohiro Misono int ret; 298023d0b79dSTomohiro Misono 298123d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 298223d0b79dSTomohiro Misono if (IS_ERR(args)) 298323d0b79dSTomohiro Misono return PTR_ERR(args); 298423d0b79dSTomohiro Misono 298523d0b79dSTomohiro Misono inode = file_inode(file); 298623d0b79dSTomohiro Misono 298723d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 298823d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 298923d0b79dSTomohiro Misono /* 299023d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 299123d0b79dSTomohiro Misono * called 299223d0b79dSTomohiro Misono */ 299323d0b79dSTomohiro Misono kfree(args); 299423d0b79dSTomohiro Misono return -EACCES; 299523d0b79dSTomohiro Misono } 299623d0b79dSTomohiro Misono 29976623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 299823d0b79dSTomohiro Misono 299923d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 300023d0b79dSTomohiro Misono ret = -EFAULT; 300123d0b79dSTomohiro Misono 300223d0b79dSTomohiro Misono kfree(args); 300323d0b79dSTomohiro Misono return ret; 300423d0b79dSTomohiro Misono } 300523d0b79dSTomohiro Misono 3006b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 30079ad12305SSahil Kang static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) 3008b64ec075STomohiro Misono { 3009b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 3010b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 3011b64ec075STomohiro Misono struct btrfs_root *root; 3012b64ec075STomohiro Misono struct btrfs_path *path; 3013b64ec075STomohiro Misono struct btrfs_key key; 3014b64ec075STomohiro Misono struct btrfs_root_item *root_item; 3015b64ec075STomohiro Misono struct btrfs_root_ref *rref; 3016b64ec075STomohiro Misono struct extent_buffer *leaf; 3017b64ec075STomohiro Misono unsigned long item_off; 3018b64ec075STomohiro Misono unsigned long item_len; 3019b64ec075STomohiro Misono int slot; 3020b64ec075STomohiro Misono int ret = 0; 3021b64ec075STomohiro Misono 3022b64ec075STomohiro Misono path = btrfs_alloc_path(); 3023b64ec075STomohiro Misono if (!path) 3024b64ec075STomohiro Misono return -ENOMEM; 3025b64ec075STomohiro Misono 3026b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 3027b64ec075STomohiro Misono if (!subvol_info) { 3028b64ec075STomohiro Misono btrfs_free_path(path); 3029b64ec075STomohiro Misono return -ENOMEM; 3030b64ec075STomohiro Misono } 3031b64ec075STomohiro Misono 3032b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 3033b64ec075STomohiro Misono 3034b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 3035b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 303656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 3037b64ec075STomohiro Misono if (IS_ERR(root)) { 3038b64ec075STomohiro Misono ret = PTR_ERR(root); 303904734e84SJosef Bacik goto out_free; 304004734e84SJosef Bacik } 3041b64ec075STomohiro Misono root_item = &root->root_item; 3042b64ec075STomohiro Misono 3043b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 3044b64ec075STomohiro Misono 3045b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 3046b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 3047b64ec075STomohiro Misono 3048b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 3049b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 3050b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3051b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 3052b64ec075STomohiro Misono BTRFS_UUID_SIZE); 3053b64ec075STomohiro Misono 3054b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 3055b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 3056b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 3057b64ec075STomohiro Misono 3058b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 3059b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 3060b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 3061b64ec075STomohiro Misono 3062b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 3063b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 3064b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 3065b64ec075STomohiro Misono 3066b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 3067b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 3068b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 3069b64ec075STomohiro Misono 3070b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 3071b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 3072b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 3073b64ec075STomohiro Misono key.offset = 0; 307404734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 3075b64ec075STomohiro Misono if (ret < 0) { 3076b64ec075STomohiro Misono goto out; 3077b64ec075STomohiro Misono } else if (path->slots[0] >= 3078b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 307904734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 3080b64ec075STomohiro Misono if (ret < 0) { 3081b64ec075STomohiro Misono goto out; 3082b64ec075STomohiro Misono } else if (ret > 0) { 3083b64ec075STomohiro Misono ret = -EUCLEAN; 3084b64ec075STomohiro Misono goto out; 3085b64ec075STomohiro Misono } 3086b64ec075STomohiro Misono } 3087b64ec075STomohiro Misono 3088b64ec075STomohiro Misono leaf = path->nodes[0]; 3089b64ec075STomohiro Misono slot = path->slots[0]; 3090b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 3091b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 3092b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 3093b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 3094b64ec075STomohiro Misono 3095b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 3096b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 3097b64ec075STomohiro Misono 3098b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 3099b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 31003212fa14SJosef Bacik item_len = btrfs_item_size(leaf, slot) 3101b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 3102b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 3103b64ec075STomohiro Misono item_off, item_len); 3104b64ec075STomohiro Misono } else { 3105b64ec075STomohiro Misono ret = -ENOENT; 3106b64ec075STomohiro Misono goto out; 3107b64ec075STomohiro Misono } 3108b64ec075STomohiro Misono } 3109b64ec075STomohiro Misono 3110013c1c55SAnand Jain btrfs_free_path(path); 3111013c1c55SAnand Jain path = NULL; 3112b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 3113b64ec075STomohiro Misono ret = -EFAULT; 3114b64ec075STomohiro Misono 3115b64ec075STomohiro Misono out: 311600246528SJosef Bacik btrfs_put_root(root); 311704734e84SJosef Bacik out_free: 3118b64ec075STomohiro Misono btrfs_free_path(path); 3119b091f7feSWaiman Long kfree(subvol_info); 3120b64ec075STomohiro Misono return ret; 3121b64ec075STomohiro Misono } 3122b64ec075STomohiro Misono 312342e4b520STomohiro Misono /* 312442e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 312542e4b520STomohiro Misono * except the subvolume name. 312642e4b520STomohiro Misono */ 31279ad12305SSahil Kang static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, 3128dc408ccdSSahil Kang void __user *argp) 312942e4b520STomohiro Misono { 313042e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 313142e4b520STomohiro Misono struct btrfs_root_ref *rref; 313242e4b520STomohiro Misono struct btrfs_path *path; 313342e4b520STomohiro Misono struct btrfs_key key; 313442e4b520STomohiro Misono struct extent_buffer *leaf; 313542e4b520STomohiro Misono u64 objectid; 313642e4b520STomohiro Misono int slot; 313742e4b520STomohiro Misono int ret; 313842e4b520STomohiro Misono u8 found; 313942e4b520STomohiro Misono 314042e4b520STomohiro Misono path = btrfs_alloc_path(); 314142e4b520STomohiro Misono if (!path) 314242e4b520STomohiro Misono return -ENOMEM; 314342e4b520STomohiro Misono 314442e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 314542e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 314642e4b520STomohiro Misono btrfs_free_path(path); 314742e4b520STomohiro Misono return PTR_ERR(rootrefs); 314842e4b520STomohiro Misono } 314942e4b520STomohiro Misono 31509ad12305SSahil Kang objectid = root->root_key.objectid; 315142e4b520STomohiro Misono key.objectid = objectid; 315242e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 315342e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 315442e4b520STomohiro Misono found = 0; 315542e4b520STomohiro Misono 31569ad12305SSahil Kang root = root->fs_info->tree_root; 315742e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 315842e4b520STomohiro Misono if (ret < 0) { 315942e4b520STomohiro Misono goto out; 316042e4b520STomohiro Misono } else if (path->slots[0] >= 316142e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 316242e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 316342e4b520STomohiro Misono if (ret < 0) { 316442e4b520STomohiro Misono goto out; 316542e4b520STomohiro Misono } else if (ret > 0) { 316642e4b520STomohiro Misono ret = -EUCLEAN; 316742e4b520STomohiro Misono goto out; 316842e4b520STomohiro Misono } 316942e4b520STomohiro Misono } 317042e4b520STomohiro Misono while (1) { 317142e4b520STomohiro Misono leaf = path->nodes[0]; 317242e4b520STomohiro Misono slot = path->slots[0]; 317342e4b520STomohiro Misono 317442e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 317542e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 317642e4b520STomohiro Misono ret = 0; 317742e4b520STomohiro Misono goto out; 317842e4b520STomohiro Misono } 317942e4b520STomohiro Misono 318042e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 318142e4b520STomohiro Misono ret = -EOVERFLOW; 318242e4b520STomohiro Misono goto out; 318342e4b520STomohiro Misono } 318442e4b520STomohiro Misono 318542e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 318642e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 318742e4b520STomohiro Misono rootrefs->rootref[found].dirid = 318842e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 318942e4b520STomohiro Misono found++; 319042e4b520STomohiro Misono 319142e4b520STomohiro Misono ret = btrfs_next_item(root, path); 319242e4b520STomohiro Misono if (ret < 0) { 319342e4b520STomohiro Misono goto out; 319442e4b520STomohiro Misono } else if (ret > 0) { 319542e4b520STomohiro Misono ret = -EUCLEAN; 319642e4b520STomohiro Misono goto out; 319742e4b520STomohiro Misono } 319842e4b520STomohiro Misono } 319942e4b520STomohiro Misono 320042e4b520STomohiro Misono out: 3201b740d806SJosef Bacik btrfs_free_path(path); 3202b740d806SJosef Bacik 320342e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 320442e4b520STomohiro Misono rootrefs->num_items = found; 320542e4b520STomohiro Misono /* update min_treeid for next search */ 320642e4b520STomohiro Misono if (found) 320742e4b520STomohiro Misono rootrefs->min_treeid = 320842e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 320942e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 321042e4b520STomohiro Misono ret = -EFAULT; 321142e4b520STomohiro Misono } 321242e4b520STomohiro Misono 321342e4b520STomohiro Misono kfree(rootrefs); 321442e4b520STomohiro Misono 321542e4b520STomohiro Misono return ret; 321642e4b520STomohiro Misono } 321742e4b520STomohiro Misono 321876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3219949964c9SMarcos Paulo de Souza void __user *arg, 3220949964c9SMarcos Paulo de Souza bool destroy_v2) 322176dda93cSYan, Zheng { 322254563d41SAl Viro struct dentry *parent = file->f_path.dentry; 32230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 322476dda93cSYan, Zheng struct dentry *dentry; 32252b0143b5SDavid Howells struct inode *dir = d_inode(parent); 322676dda93cSYan, Zheng struct inode *inode; 322776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 322876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3229949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3230949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3231c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3232949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3233949964c9SMarcos Paulo de Souza int subvol_namelen; 323476dda93cSYan, Zheng int err = 0; 3235949964c9SMarcos Paulo de Souza bool destroy_parent = false; 323676dda93cSYan, Zheng 3237813febdbSJosef Bacik /* We don't support snapshots with extent tree v2 yet. */ 3238813febdbSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3239813febdbSJosef Bacik btrfs_err(fs_info, 3240813febdbSJosef Bacik "extent tree v2 doesn't support snapshot deletion yet"); 3241813febdbSJosef Bacik return -EOPNOTSUPP; 3242813febdbSJosef Bacik } 3243813febdbSJosef Bacik 3244949964c9SMarcos Paulo de Souza if (destroy_v2) { 3245949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3246949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3247949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3248325c50e3SJeff Mahoney 3249949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3250949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3251949964c9SMarcos Paulo de Souza goto out; 3252949964c9SMarcos Paulo de Souza } 325376dda93cSYan, Zheng 3254949964c9SMarcos Paulo de Souza /* 3255949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3256949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3257949964c9SMarcos Paulo de Souza */ 3258949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3259949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3260949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3261949964c9SMarcos Paulo de Souza 3262949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3263949964c9SMarcos Paulo de Souza if (err) 3264949964c9SMarcos Paulo de Souza goto out; 3265949964c9SMarcos Paulo de Souza } else { 3266aabb34e7SChristian Brauner struct inode *old_dir; 3267c4ed533bSChristian Brauner 3268949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 326976dda93cSYan, Zheng err = -EINVAL; 327076dda93cSYan, Zheng goto out; 327176dda93cSYan, Zheng } 327276dda93cSYan, Zheng 3273a561be71SAl Viro err = mnt_want_write_file(file); 327476dda93cSYan, Zheng if (err) 327576dda93cSYan, Zheng goto out; 327676dda93cSYan, Zheng 3277949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3278949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3279b307f06dSDavid Sterba vol_args2->subvolid, 0); 3280949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3281949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3282949964c9SMarcos Paulo de Souza goto out_drop_write; 3283949964c9SMarcos Paulo de Souza } 3284949964c9SMarcos Paulo de Souza 3285949964c9SMarcos Paulo de Souza /* 3286949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3287949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3288949964c9SMarcos Paulo de Souza */ 3289949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3290949964c9SMarcos Paulo de Souza 3291949964c9SMarcos Paulo de Souza /* 3292949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3293949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3294949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3295949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3296949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3297949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3298949964c9SMarcos Paulo de Souza */ 3299949964c9SMarcos Paulo de Souza dput(dentry); 3300949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3301949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3302949964c9SMarcos Paulo de Souza goto out_drop_write; 3303949964c9SMarcos Paulo de Souza } 3304aabb34e7SChristian Brauner old_dir = dir; 3305949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3306949964c9SMarcos Paulo de Souza 3307949964c9SMarcos Paulo de Souza /* 3308949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3309949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3310949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3311949964c9SMarcos Paulo de Souza * new parent dentry. 3312949964c9SMarcos Paulo de Souza */ 3313949964c9SMarcos Paulo de Souza destroy_parent = true; 3314949964c9SMarcos Paulo de Souza 3315aabb34e7SChristian Brauner /* 3316aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3317aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3318aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3319aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3320aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3321aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3322aabb34e7SChristian Brauner * to delete without an idmapped mount. 3323aabb34e7SChristian Brauner */ 3324aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3325aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3326aabb34e7SChristian Brauner goto free_parent; 3327aabb34e7SChristian Brauner } 3328aabb34e7SChristian Brauner 3329949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3330949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3331949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3332949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3333949964c9SMarcos Paulo de Souza goto free_parent; 3334949964c9SMarcos Paulo de Souza } 33351a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3336949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3337949964c9SMarcos Paulo de Souza } 3338949964c9SMarcos Paulo de Souza } else { 3339949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3340949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3341949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3342949964c9SMarcos Paulo de Souza 3343949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3344949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3345949964c9SMarcos Paulo de Souza 3346949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3347949964c9SMarcos Paulo de Souza if (err) 3348949964c9SMarcos Paulo de Souza goto out; 3349949964c9SMarcos Paulo de Souza } 3350949964c9SMarcos Paulo de Souza 3351949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3352949964c9SMarcos Paulo de Souza 3353949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3354949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3355949964c9SMarcos Paulo de Souza err = -EINVAL; 3356949964c9SMarcos Paulo de Souza goto free_subvol_name; 3357949964c9SMarcos Paulo de Souza } 3358949964c9SMarcos Paulo de Souza 3359949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3360949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3361949964c9SMarcos Paulo de Souza goto free_subvol_name; 3362949964c9SMarcos Paulo de Souza } 3363521e0546SDavid Sterba 336400235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 336500235411SAl Viro if (err == -EINTR) 3366949964c9SMarcos Paulo de Souza goto free_subvol_name; 3367c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 336876dda93cSYan, Zheng if (IS_ERR(dentry)) { 336976dda93cSYan, Zheng err = PTR_ERR(dentry); 337076dda93cSYan, Zheng goto out_unlock_dir; 337176dda93cSYan, Zheng } 337276dda93cSYan, Zheng 33732b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 337476dda93cSYan, Zheng err = -ENOENT; 337576dda93cSYan, Zheng goto out_dput; 337676dda93cSYan, Zheng } 337776dda93cSYan, Zheng 33782b0143b5SDavid Howells inode = d_inode(dentry); 33794260f7c7SSage Weil dest = BTRFS_I(inode)->root; 33804260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 33814260f7c7SSage Weil /* 33824260f7c7SSage Weil * Regular user. Only allow this with a special mount 33834260f7c7SSage Weil * option, when the user has write+exec access to the 33844260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 33854260f7c7SSage Weil * allowed. 33864260f7c7SSage Weil * 33874260f7c7SSage Weil * Note that this is _not_ check that the subvol is 33884260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 33894260f7c7SSage Weil * otherwise be able to delete. 33904260f7c7SSage Weil * 33914260f7c7SSage Weil * Users who want to delete empty subvols should try 33924260f7c7SSage Weil * rmdir(2). 33934260f7c7SSage Weil */ 33944260f7c7SSage Weil err = -EPERM; 33950b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 33964260f7c7SSage Weil goto out_dput; 33974260f7c7SSage Weil 33984260f7c7SSage Weil /* 33994260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 34004260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 34014260f7c7SSage Weil * must be called on the dentry referencing the root 34024260f7c7SSage Weil * of the subvol, not a random directory contained 34034260f7c7SSage Weil * within it. 34044260f7c7SSage Weil */ 34054260f7c7SSage Weil err = -EINVAL; 34064260f7c7SSage Weil if (root == dest) 34074260f7c7SSage Weil goto out_dput; 34084260f7c7SSage Weil 3409c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 34104260f7c7SSage Weil if (err) 34114260f7c7SSage Weil goto out_dput; 34125c39da5bSMiao Xie } 34134260f7c7SSage Weil 34145c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3415c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 34164260f7c7SSage Weil if (err) 34174260f7c7SSage Weil goto out_dput; 34184260f7c7SSage Weil 34194a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 342076dda93cSYan, Zheng err = -EINVAL; 342176dda93cSYan, Zheng goto out_dput; 342276dda93cSYan, Zheng } 342376dda93cSYan, Zheng 342464708539SJosef Bacik btrfs_inode_lock(inode, 0); 3425f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 342664708539SJosef Bacik btrfs_inode_unlock(inode, 0); 3427a37d9a17SAmir Goldstein if (!err) 3428a37d9a17SAmir Goldstein d_delete_notify(dir, dentry); 3429fa6ac876SLiu Bo 343076dda93cSYan, Zheng out_dput: 343176dda93cSYan, Zheng dput(dentry); 343276dda93cSYan, Zheng out_unlock_dir: 343364708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3434949964c9SMarcos Paulo de Souza free_subvol_name: 3435949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3436949964c9SMarcos Paulo de Souza free_parent: 3437949964c9SMarcos Paulo de Souza if (destroy_parent) 3438949964c9SMarcos Paulo de Souza dput(parent); 343900235411SAl Viro out_drop_write: 34402a79f17eSAl Viro mnt_drop_write_file(file); 344176dda93cSYan, Zheng out: 3442949964c9SMarcos Paulo de Souza kfree(vol_args2); 344376dda93cSYan, Zheng kfree(vol_args); 344476dda93cSYan, Zheng return err; 344576dda93cSYan, Zheng } 344676dda93cSYan, Zheng 34471e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3448f46b5a66SChristoph Hellwig { 3449496ad9aaSAl Viro struct inode *inode = file_inode(file); 3450f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3451c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3452c146afadSYan Zheng int ret; 3453c146afadSYan Zheng 345425122d15SIlya Dryomov ret = mnt_want_write_file(file); 345525122d15SIlya Dryomov if (ret) 345625122d15SIlya Dryomov return ret; 3457b83cc969SLi Zefan 345825122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 345925122d15SIlya Dryomov ret = -EROFS; 346025122d15SIlya Dryomov goto out; 34615ac00addSStefan Behrens } 3462f46b5a66SChristoph Hellwig 3463f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3464f46b5a66SChristoph Hellwig case S_IFDIR: 3465e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3466e441d54dSChris Mason ret = -EPERM; 3467e441d54dSChris Mason goto out; 3468e441d54dSChris Mason } 3469de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3470f46b5a66SChristoph Hellwig break; 3471f46b5a66SChristoph Hellwig case S_IFREG: 3472616d374eSAdam Borowski /* 3473616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3474616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3475616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3476616d374eSAdam Borowski */ 3477616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 347847291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3479616d374eSAdam Borowski ret = -EPERM; 3480e441d54dSChris Mason goto out; 3481e441d54dSChris Mason } 34821e701a32SChris Mason 34831e701a32SChris Mason if (argp) { 3484c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 34851e701a32SChris Mason ret = -EFAULT; 3486683be16eSDan Carpenter goto out; 34871e701a32SChris Mason } 34881e701a32SChris Mason /* compression requires us to start the IO */ 3489c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3490c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3491c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 34921e701a32SChris Mason } 34931e701a32SChris Mason } else { 34941e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3495c853a578SGoldwyn Rodrigues range.len = (u64)-1; 34961e701a32SChris Mason } 34971ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3498c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 34994cb5300bSChris Mason if (ret > 0) 35004cb5300bSChris Mason ret = 0; 3501f46b5a66SChristoph Hellwig break; 35028929ecfaSYan, Zheng default: 35038929ecfaSYan, Zheng ret = -EINVAL; 3504f46b5a66SChristoph Hellwig } 3505e441d54dSChris Mason out: 350625122d15SIlya Dryomov mnt_drop_write_file(file); 3507e441d54dSChris Mason return ret; 3508f46b5a66SChristoph Hellwig } 3509f46b5a66SChristoph Hellwig 35102ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3511f46b5a66SChristoph Hellwig { 3512f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3513a174c0a2SNikolay Borisov bool restore_op = false; 3514f46b5a66SChristoph Hellwig int ret; 3515f46b5a66SChristoph Hellwig 3516e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3517e441d54dSChris Mason return -EPERM; 3518e441d54dSChris Mason 3519914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 3520914a519bSJosef Bacik btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); 3521914a519bSJosef Bacik return -EINVAL; 3522914a519bSJosef Bacik } 3523914a519bSJosef Bacik 3524a174c0a2SNikolay Borisov if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { 3525a174c0a2SNikolay Borisov if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3526e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3527c9e9f97bSIlya Dryomov 3528a174c0a2SNikolay Borisov /* 3529a174c0a2SNikolay Borisov * We can do the device add because we have a paused balanced, 3530a174c0a2SNikolay Borisov * change the exclusive op type and remember we should bring 3531a174c0a2SNikolay Borisov * back the paused balance 3532a174c0a2SNikolay Borisov */ 3533a174c0a2SNikolay Borisov fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; 3534a174c0a2SNikolay Borisov btrfs_exclop_start_unlock(fs_info); 3535a174c0a2SNikolay Borisov restore_op = true; 3536a174c0a2SNikolay Borisov } 3537a174c0a2SNikolay Borisov 3538dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3539c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3540c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3541c9e9f97bSIlya Dryomov goto out; 3542c9e9f97bSIlya Dryomov } 3543f46b5a66SChristoph Hellwig 35445516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 35452ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3546f46b5a66SChristoph Hellwig 354743d20761SAnand Jain if (!ret) 35480b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 354943d20761SAnand Jain 3550f46b5a66SChristoph Hellwig kfree(vol_args); 3551c9e9f97bSIlya Dryomov out: 3552a174c0a2SNikolay Borisov if (restore_op) 3553a174c0a2SNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); 3554a174c0a2SNikolay Borisov else 3555c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3556f46b5a66SChristoph Hellwig return ret; 3557f46b5a66SChristoph Hellwig } 3558f46b5a66SChristoph Hellwig 35596b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3560f46b5a66SChristoph Hellwig { 35611a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 35620b246afaSJeff Mahoney struct inode *inode = file_inode(file); 35630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 35646b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 35653fa421deSJosef Bacik struct block_device *bdev = NULL; 35663fa421deSJosef Bacik fmode_t mode; 3567f46b5a66SChristoph Hellwig int ret; 356867ae34b6SDavid Sterba bool cancel = false; 3569f46b5a66SChristoph Hellwig 3570e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3571e441d54dSChris Mason return -EPERM; 3572e441d54dSChris Mason 3573dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3574d815b3f2SDan Carpenter if (IS_ERR(vol_args)) 3575d815b3f2SDan Carpenter return PTR_ERR(vol_args); 3576f46b5a66SChristoph Hellwig 3577748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3578fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3579fd4e994bSOmar Sandoval goto out; 3580fd4e994bSOmar Sandoval } 35811a15eb72SJosef Bacik 35826b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 35831a15eb72SJosef Bacik if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 35841a15eb72SJosef Bacik args.devid = vol_args->devid; 35851a15eb72SJosef Bacik } else if (!strcmp("cancel", vol_args->name)) { 358667ae34b6SDavid Sterba cancel = true; 35871a15eb72SJosef Bacik } else { 35881a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 35891a15eb72SJosef Bacik if (ret) 35901a15eb72SJosef Bacik goto out; 35911a15eb72SJosef Bacik } 35921a15eb72SJosef Bacik 35931a15eb72SJosef Bacik ret = mnt_want_write_file(file); 35941a15eb72SJosef Bacik if (ret) 35951a15eb72SJosef Bacik goto out; 359667ae34b6SDavid Sterba 359767ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 359867ae34b6SDavid Sterba cancel); 359967ae34b6SDavid Sterba if (ret) 36001a15eb72SJosef Bacik goto err_drop; 360167ae34b6SDavid Sterba 36021a15eb72SJosef Bacik /* Exclusive operation is now claimed */ 36031a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 360467ae34b6SDavid Sterba 3605c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3606183860f6SAnand Jain 36076b526ed7SAnand Jain if (!ret) { 3608735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 36090b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 36106b526ed7SAnand Jain vol_args->devid); 36116b526ed7SAnand Jain else 36120b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 36136b526ed7SAnand Jain vol_args->name); 36146b526ed7SAnand Jain } 3615c47ca32dSDan Carpenter err_drop: 36164ac20c70SIlya Dryomov mnt_drop_write_file(file); 36173fa421deSJosef Bacik if (bdev) 36183fa421deSJosef Bacik blkdev_put(bdev, mode); 36191a15eb72SJosef Bacik out: 36201a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36211a15eb72SJosef Bacik kfree(vol_args); 3622f46b5a66SChristoph Hellwig return ret; 3623f46b5a66SChristoph Hellwig } 3624f46b5a66SChristoph Hellwig 3625f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3626f46b5a66SChristoph Hellwig { 36271a15eb72SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 36280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 36290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3630f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 36313fa421deSJosef Bacik struct block_device *bdev = NULL; 36323fa421deSJosef Bacik fmode_t mode; 3633f46b5a66SChristoph Hellwig int ret; 363437b45995STom Rix bool cancel = false; 3635f46b5a66SChristoph Hellwig 3636f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3637f46b5a66SChristoph Hellwig return -EPERM; 3638f46b5a66SChristoph Hellwig 36391a15eb72SJosef Bacik vol_args = memdup_user(arg, sizeof(*vol_args)); 36401a15eb72SJosef Bacik if (IS_ERR(vol_args)) 36411a15eb72SJosef Bacik return PTR_ERR(vol_args); 36421a15eb72SJosef Bacik 36431a15eb72SJosef Bacik vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 36441a15eb72SJosef Bacik if (!strcmp("cancel", vol_args->name)) { 36451a15eb72SJosef Bacik cancel = true; 36461a15eb72SJosef Bacik } else { 36471a15eb72SJosef Bacik ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); 36481a15eb72SJosef Bacik if (ret) 36491a15eb72SJosef Bacik goto out; 36501a15eb72SJosef Bacik } 36511a15eb72SJosef Bacik 3652f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3653f46b5a66SChristoph Hellwig if (ret) 36541a15eb72SJosef Bacik goto out; 3655f46b5a66SChristoph Hellwig 365667ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 365767ae34b6SDavid Sterba cancel); 365867ae34b6SDavid Sterba if (ret == 0) { 36591a15eb72SJosef Bacik ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); 3660f46b5a66SChristoph Hellwig if (!ret) 36610b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3662c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 366367ae34b6SDavid Sterba } 366467ae34b6SDavid Sterba 3665f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 36663fa421deSJosef Bacik if (bdev) 36673fa421deSJosef Bacik blkdev_put(bdev, mode); 36681a15eb72SJosef Bacik out: 36691a15eb72SJosef Bacik btrfs_put_dev_args_from_path(&args); 36701a15eb72SJosef Bacik kfree(vol_args); 3671f46b5a66SChristoph Hellwig return ret; 3672f46b5a66SChristoph Hellwig } 3673f46b5a66SChristoph Hellwig 36742ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 36752ff7e61eSJeff Mahoney void __user *arg) 3676475f6387SJan Schmidt { 3677027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3678475f6387SJan Schmidt struct btrfs_device *device; 36790b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3680137c5418SJohannes Thumshirn u64 flags_in; 3681027ed2f0SLi Zefan int ret = 0; 3682475f6387SJan Schmidt 3683137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3684137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3685137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3686137c5418SJohannes Thumshirn 3687137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3688137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3689027ed2f0SLi Zefan 3690d03262c7SDavid Sterba rcu_read_lock(); 3691027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3692475f6387SJan Schmidt 3693d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3694027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3695027ed2f0SLi Zefan fi_args->max_id = device->devid; 3696475f6387SJan Schmidt } 3697d03262c7SDavid Sterba rcu_read_unlock(); 3698475f6387SJan Schmidt 3699de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3700bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3701bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3702bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 370380a773fbSDavid Sterba 3704137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3705137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3706137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3707137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3708137c5418SJohannes Thumshirn } 3709137c5418SJohannes Thumshirn 37100fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 37110fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 37120fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 37130fb408a5SJohannes Thumshirn } 37140fb408a5SJohannes Thumshirn 371549bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 371649bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 371749bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 371849bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 371949bac897SJohannes Thumshirn } 372049bac897SJohannes Thumshirn 3721027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3722027ed2f0SLi Zefan ret = -EFAULT; 3723475f6387SJan Schmidt 3724027ed2f0SLi Zefan kfree(fi_args); 3725027ed2f0SLi Zefan return ret; 3726475f6387SJan Schmidt } 3727475f6387SJan Schmidt 37282ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 37292ff7e61eSJeff Mahoney void __user *arg) 3730475f6387SJan Schmidt { 3731562d7b15SJosef Bacik BTRFS_DEV_LOOKUP_ARGS(args); 3732475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3733475f6387SJan Schmidt struct btrfs_device *dev; 3734475f6387SJan Schmidt int ret = 0; 3735475f6387SJan Schmidt 3736475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3737475f6387SJan Schmidt if (IS_ERR(di_args)) 3738475f6387SJan Schmidt return PTR_ERR(di_args); 3739475f6387SJan Schmidt 3740562d7b15SJosef Bacik args.devid = di_args->devid; 3741dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3742562d7b15SJosef Bacik args.uuid = di_args->uuid; 3743475f6387SJan Schmidt 3744c5593ca3SDavid Sterba rcu_read_lock(); 3745562d7b15SJosef Bacik dev = btrfs_find_device(fs_info->fs_devices, &args); 3746475f6387SJan Schmidt if (!dev) { 3747475f6387SJan Schmidt ret = -ENODEV; 3748475f6387SJan Schmidt goto out; 3749475f6387SJan Schmidt } 3750475f6387SJan Schmidt 3751475f6387SJan Schmidt di_args->devid = dev->devid; 37527cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 37537cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3754475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3755a27202fbSJim Meyering if (dev->name) { 3756672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3757672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3758a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3759a27202fbSJim Meyering } else { 376099ba55adSStefan Behrens di_args->path[0] = '\0'; 3761a27202fbSJim Meyering } 3762475f6387SJan Schmidt 3763475f6387SJan Schmidt out: 3764c5593ca3SDavid Sterba rcu_read_unlock(); 3765475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3766475f6387SJan Schmidt ret = -EFAULT; 3767475f6387SJan Schmidt 3768475f6387SJan Schmidt kfree(di_args); 3769475f6387SJan Schmidt return ret; 3770475f6387SJan Schmidt } 3771475f6387SJan Schmidt 37726ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 37736ef5ed0dSJosef Bacik { 3774496ad9aaSAl Viro struct inode *inode = file_inode(file); 37750b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 37766ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 37776ef5ed0dSJosef Bacik struct btrfs_root *new_root; 37786ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 37796ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 37802a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 37816ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 37826ef5ed0dSJosef Bacik u64 objectid = 0; 37836ef5ed0dSJosef Bacik u64 dir_id; 37843c04ce01SMiao Xie int ret; 37856ef5ed0dSJosef Bacik 37866ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 37876ef5ed0dSJosef Bacik return -EPERM; 37886ef5ed0dSJosef Bacik 37893c04ce01SMiao Xie ret = mnt_want_write_file(file); 37903c04ce01SMiao Xie if (ret) 37913c04ce01SMiao Xie return ret; 37923c04ce01SMiao Xie 37933c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 37943c04ce01SMiao Xie ret = -EFAULT; 37953c04ce01SMiao Xie goto out; 37963c04ce01SMiao Xie } 37976ef5ed0dSJosef Bacik 37986ef5ed0dSJosef Bacik if (!objectid) 37991cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 38006ef5ed0dSJosef Bacik 380156e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 38023c04ce01SMiao Xie if (IS_ERR(new_root)) { 38033c04ce01SMiao Xie ret = PTR_ERR(new_root); 38043c04ce01SMiao Xie goto out; 38053c04ce01SMiao Xie } 38062a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 38072a2b5d62SJosef Bacik ret = -ENOENT; 38082a2b5d62SJosef Bacik goto out_free; 38092a2b5d62SJosef Bacik } 38106ef5ed0dSJosef Bacik 38116ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 38123c04ce01SMiao Xie if (!path) { 38133c04ce01SMiao Xie ret = -ENOMEM; 38142a2b5d62SJosef Bacik goto out_free; 38153c04ce01SMiao Xie } 38166ef5ed0dSJosef Bacik 38176ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 381898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 38193c04ce01SMiao Xie ret = PTR_ERR(trans); 38202a2b5d62SJosef Bacik goto out_free; 38216ef5ed0dSJosef Bacik } 38226ef5ed0dSJosef Bacik 38230b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 38240b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 38256ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3826cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 38272a2b5d62SJosef Bacik btrfs_release_path(path); 38283a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38290b246afaSJeff Mahoney btrfs_err(fs_info, 38305d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 38313c04ce01SMiao Xie ret = -ENOENT; 38322a2b5d62SJosef Bacik goto out_free; 38336ef5ed0dSJosef Bacik } 38346ef5ed0dSJosef Bacik 38356ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 38366ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 38376ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 38382a2b5d62SJosef Bacik btrfs_release_path(path); 38396ef5ed0dSJosef Bacik 38400b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 38413a45bb20SJeff Mahoney btrfs_end_transaction(trans); 38422a2b5d62SJosef Bacik out_free: 384300246528SJosef Bacik btrfs_put_root(new_root); 38442a2b5d62SJosef Bacik btrfs_free_path(path); 38453c04ce01SMiao Xie out: 38463c04ce01SMiao Xie mnt_drop_write_file(file); 38473c04ce01SMiao Xie return ret; 38486ef5ed0dSJosef Bacik } 38496ef5ed0dSJosef Bacik 3850c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3851bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3852bf5fc093SJosef Bacik { 385332da5386SDavid Sterba struct btrfs_block_group *block_group; 3854bf5fc093SJosef Bacik 3855bf5fc093SJosef Bacik space->total_bytes = 0; 3856bf5fc093SJosef Bacik space->used_bytes = 0; 3857bf5fc093SJosef Bacik space->flags = 0; 3858bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3859bf5fc093SJosef Bacik space->flags = block_group->flags; 3860b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3861bf38be65SDavid Sterba space->used_bytes += block_group->used; 3862bf5fc093SJosef Bacik } 3863bf5fc093SJosef Bacik } 3864bf5fc093SJosef Bacik 38652ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 38662ff7e61eSJeff Mahoney void __user *arg) 38671406e432SJosef Bacik { 38681406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 38691406e432SJosef Bacik struct btrfs_ioctl_space_info space; 38701406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 38717fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 387213f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 38731406e432SJosef Bacik struct btrfs_space_info *info; 3874315d8e98SColin Ian King static const u64 types[] = { 3875315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3876bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3877bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3878315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3879315d8e98SColin Ian King }; 3880bf5fc093SJosef Bacik int num_types = 4; 38817fde62bfSChris Mason int alloc_size; 38821406e432SJosef Bacik int ret = 0; 388351788b1bSDan Rosenberg u64 slot_count = 0; 3884bf5fc093SJosef Bacik int i, c; 38851406e432SJosef Bacik 38861406e432SJosef Bacik if (copy_from_user(&space_args, 38871406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 38881406e432SJosef Bacik sizeof(space_args))) 38891406e432SJosef Bacik return -EFAULT; 38901406e432SJosef Bacik 3891bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3892bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3893bf5fc093SJosef Bacik 3894bf5fc093SJosef Bacik info = NULL; 389572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3896bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3897bf5fc093SJosef Bacik info = tmp; 3898bf5fc093SJosef Bacik break; 3899bf5fc093SJosef Bacik } 3900bf5fc093SJosef Bacik } 39011406e432SJosef Bacik 3902bf5fc093SJosef Bacik if (!info) 3903bf5fc093SJosef Bacik continue; 3904bf5fc093SJosef Bacik 3905bf5fc093SJosef Bacik down_read(&info->groups_sem); 3906bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3907bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3908bf5fc093SJosef Bacik slot_count++; 3909bf5fc093SJosef Bacik } 3910bf5fc093SJosef Bacik up_read(&info->groups_sem); 3911bf5fc093SJosef Bacik } 3912bf5fc093SJosef Bacik 391336523e95SDavid Sterba /* 391436523e95SDavid Sterba * Global block reserve, exported as a space_info 391536523e95SDavid Sterba */ 391636523e95SDavid Sterba slot_count++; 391736523e95SDavid Sterba 39187fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 39197fde62bfSChris Mason if (space_args.space_slots == 0) { 39207fde62bfSChris Mason space_args.total_spaces = slot_count; 39217fde62bfSChris Mason goto out; 39227fde62bfSChris Mason } 3923bf5fc093SJosef Bacik 392451788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3925bf5fc093SJosef Bacik 39267fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3927bf5fc093SJosef Bacik 39287fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 39297fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 39307fde62bfSChris Mason */ 393109cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 39327fde62bfSChris Mason return -ENOMEM; 39337fde62bfSChris Mason 39347fde62bfSChris Mason space_args.total_spaces = 0; 39358d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 39367fde62bfSChris Mason if (!dest) 39377fde62bfSChris Mason return -ENOMEM; 39387fde62bfSChris Mason dest_orig = dest; 39397fde62bfSChris Mason 39407fde62bfSChris Mason /* now we have a buffer to copy into */ 3941bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3942bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3943bf5fc093SJosef Bacik 394451788b1bSDan Rosenberg if (!slot_count) 394551788b1bSDan Rosenberg break; 394651788b1bSDan Rosenberg 3947bf5fc093SJosef Bacik info = NULL; 394872804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3949bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3950bf5fc093SJosef Bacik info = tmp; 39517fde62bfSChris Mason break; 3952bf5fc093SJosef Bacik } 3953bf5fc093SJosef Bacik } 39547fde62bfSChris Mason 3955bf5fc093SJosef Bacik if (!info) 3956bf5fc093SJosef Bacik continue; 3957bf5fc093SJosef Bacik down_read(&info->groups_sem); 3958bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3959bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3960c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3961c065f5b1SSu Yue &space); 39627fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 39631406e432SJosef Bacik dest++; 39641406e432SJosef Bacik space_args.total_spaces++; 396551788b1bSDan Rosenberg slot_count--; 39661406e432SJosef Bacik } 396751788b1bSDan Rosenberg if (!slot_count) 396851788b1bSDan Rosenberg break; 3969bf5fc093SJosef Bacik } 3970bf5fc093SJosef Bacik up_read(&info->groups_sem); 3971bf5fc093SJosef Bacik } 39721406e432SJosef Bacik 397336523e95SDavid Sterba /* 397436523e95SDavid Sterba * Add global block reserve 397536523e95SDavid Sterba */ 397636523e95SDavid Sterba if (slot_count) { 39770b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 397836523e95SDavid Sterba 397936523e95SDavid Sterba spin_lock(&block_rsv->lock); 398036523e95SDavid Sterba space.total_bytes = block_rsv->size; 398136523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 398236523e95SDavid Sterba spin_unlock(&block_rsv->lock); 398336523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 398436523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 398536523e95SDavid Sterba space_args.total_spaces++; 398636523e95SDavid Sterba } 398736523e95SDavid Sterba 39882eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 39897fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 39907fde62bfSChris Mason 39917fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 39927fde62bfSChris Mason ret = -EFAULT; 39937fde62bfSChris Mason 39947fde62bfSChris Mason kfree(dest_orig); 39957fde62bfSChris Mason out: 39967fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 39971406e432SJosef Bacik ret = -EFAULT; 39981406e432SJosef Bacik 39991406e432SJosef Bacik return ret; 40001406e432SJosef Bacik } 40011406e432SJosef Bacik 40029a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 40039a8c28beSMiao Xie void __user *argp) 400446204592SSage Weil { 400546204592SSage Weil struct btrfs_trans_handle *trans; 400646204592SSage Weil u64 transid; 400746204592SSage Weil 4008d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 4009ff7c1d33SMiao Xie if (IS_ERR(trans)) { 4010ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 401198d5dc13STsutomu Itoh return PTR_ERR(trans); 4012ff7c1d33SMiao Xie 4013ff7c1d33SMiao Xie /* No running transaction, don't bother */ 4014ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 4015ff7c1d33SMiao Xie goto out; 4016ff7c1d33SMiao Xie } 401746204592SSage Weil transid = trans->transid; 4018fdfbf020SJosef Bacik btrfs_commit_transaction_async(trans); 4019ff7c1d33SMiao Xie out: 402046204592SSage Weil if (argp) 402146204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 402246204592SSage Weil return -EFAULT; 402346204592SSage Weil return 0; 402446204592SSage Weil } 402546204592SSage Weil 40262ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 40279a8c28beSMiao Xie void __user *argp) 402846204592SSage Weil { 402946204592SSage Weil u64 transid; 403046204592SSage Weil 403146204592SSage Weil if (argp) { 403246204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 403346204592SSage Weil return -EFAULT; 403446204592SSage Weil } else { 403546204592SSage Weil transid = 0; /* current trans */ 403646204592SSage Weil } 40372ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 403846204592SSage Weil } 403946204592SSage Weil 4040b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 4041475f6387SJan Schmidt { 40420b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 4043475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4044b8e95489SMiao Xie int ret; 4045475f6387SJan Schmidt 4046475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4047475f6387SJan Schmidt return -EPERM; 4048475f6387SJan Schmidt 4049da32c6d5SJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4050da32c6d5SJosef Bacik btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); 4051da32c6d5SJosef Bacik return -EINVAL; 4052da32c6d5SJosef Bacik } 4053da32c6d5SJosef Bacik 4054475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4055475f6387SJan Schmidt if (IS_ERR(sa)) 4056475f6387SJan Schmidt return PTR_ERR(sa); 4057475f6387SJan Schmidt 4058b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 4059b8e95489SMiao Xie ret = mnt_want_write_file(file); 4060b8e95489SMiao Xie if (ret) 4061b8e95489SMiao Xie goto out; 4062b8e95489SMiao Xie } 4063b8e95489SMiao Xie 40640b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 406563a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 406663a212abSStefan Behrens 0); 4067475f6387SJan Schmidt 40685afe6ce7SFilipe Manana /* 40695afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 40705afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 40715afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 40725afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 40735afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 40745afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 40755afe6ce7SFilipe Manana * previously (btrfs-progs does this). 40765afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 40775afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 40785afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 40795afe6ce7SFilipe Manana */ 40805afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 4081475f6387SJan Schmidt ret = -EFAULT; 4082475f6387SJan Schmidt 4083b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 4084b8e95489SMiao Xie mnt_drop_write_file(file); 4085b8e95489SMiao Xie out: 4086475f6387SJan Schmidt kfree(sa); 4087475f6387SJan Schmidt return ret; 4088475f6387SJan Schmidt } 4089475f6387SJan Schmidt 40902ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 4091475f6387SJan Schmidt { 4092475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4093475f6387SJan Schmidt return -EPERM; 4094475f6387SJan Schmidt 40952ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 4096475f6387SJan Schmidt } 4097475f6387SJan Schmidt 40982ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 4099475f6387SJan Schmidt void __user *arg) 4100475f6387SJan Schmidt { 4101475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 4102475f6387SJan Schmidt int ret; 4103475f6387SJan Schmidt 4104475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4105475f6387SJan Schmidt return -EPERM; 4106475f6387SJan Schmidt 4107475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 4108475f6387SJan Schmidt if (IS_ERR(sa)) 4109475f6387SJan Schmidt return PTR_ERR(sa); 4110475f6387SJan Schmidt 41112ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 4112475f6387SJan Schmidt 41134fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4114475f6387SJan Schmidt ret = -EFAULT; 4115475f6387SJan Schmidt 4116475f6387SJan Schmidt kfree(sa); 4117475f6387SJan Schmidt return ret; 4118475f6387SJan Schmidt } 4119475f6387SJan Schmidt 41202ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 4121b27f7c0cSDavid Sterba void __user *arg) 4122c11d2c23SStefan Behrens { 4123c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 4124c11d2c23SStefan Behrens int ret; 4125c11d2c23SStefan Behrens 4126c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 4127c11d2c23SStefan Behrens if (IS_ERR(sa)) 4128c11d2c23SStefan Behrens return PTR_ERR(sa); 4129c11d2c23SStefan Behrens 4130b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 4131b27f7c0cSDavid Sterba kfree(sa); 4132b27f7c0cSDavid Sterba return -EPERM; 4133b27f7c0cSDavid Sterba } 4134b27f7c0cSDavid Sterba 41352ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 4136c11d2c23SStefan Behrens 4137eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 4138c11d2c23SStefan Behrens ret = -EFAULT; 4139c11d2c23SStefan Behrens 4140c11d2c23SStefan Behrens kfree(sa); 4141c11d2c23SStefan Behrens return ret; 4142c11d2c23SStefan Behrens } 4143c11d2c23SStefan Behrens 41442ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 41452ff7e61eSJeff Mahoney void __user *arg) 41463f6bcfbdSStefan Behrens { 41473f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 41483f6bcfbdSStefan Behrens int ret; 41493f6bcfbdSStefan Behrens 41503f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 41513f6bcfbdSStefan Behrens return -EPERM; 41523f6bcfbdSStefan Behrens 4153914a519bSJosef Bacik if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { 4154914a519bSJosef Bacik btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); 4155914a519bSJosef Bacik return -EINVAL; 4156914a519bSJosef Bacik } 4157914a519bSJosef Bacik 41583f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 41593f6bcfbdSStefan Behrens if (IS_ERR(p)) 41603f6bcfbdSStefan Behrens return PTR_ERR(p); 41613f6bcfbdSStefan Behrens 41623f6bcfbdSStefan Behrens switch (p->cmd) { 41633f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 4164bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 4165adfa97cbSIlya Dryomov ret = -EROFS; 4166adfa97cbSIlya Dryomov goto out; 4167adfa97cbSIlya Dryomov } 4168c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 4169e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 41703f6bcfbdSStefan Behrens } else { 41712ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 4172c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 41733f6bcfbdSStefan Behrens } 41743f6bcfbdSStefan Behrens break; 41753f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 41760b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 41773f6bcfbdSStefan Behrens ret = 0; 41783f6bcfbdSStefan Behrens break; 41793f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 418017d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 418197282031SAnand Jain ret = 0; 41823f6bcfbdSStefan Behrens break; 41833f6bcfbdSStefan Behrens default: 41843f6bcfbdSStefan Behrens ret = -EINVAL; 41853f6bcfbdSStefan Behrens break; 41863f6bcfbdSStefan Behrens } 41873f6bcfbdSStefan Behrens 4188d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 41893f6bcfbdSStefan Behrens ret = -EFAULT; 4190adfa97cbSIlya Dryomov out: 41913f6bcfbdSStefan Behrens kfree(p); 41923f6bcfbdSStefan Behrens return ret; 41933f6bcfbdSStefan Behrens } 41943f6bcfbdSStefan Behrens 4195d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4196d7728c96SJan Schmidt { 4197d7728c96SJan Schmidt int ret = 0; 4198d7728c96SJan Schmidt int i; 4199740c3d22SChris Mason u64 rel_ptr; 4200d7728c96SJan Schmidt int size; 4201806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4202d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4203d7728c96SJan Schmidt struct btrfs_path *path; 4204d7728c96SJan Schmidt 420582b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4206d7728c96SJan Schmidt return -EPERM; 4207d7728c96SJan Schmidt 4208d7728c96SJan Schmidt path = btrfs_alloc_path(); 4209d7728c96SJan Schmidt if (!path) { 4210d7728c96SJan Schmidt ret = -ENOMEM; 4211d7728c96SJan Schmidt goto out; 4212d7728c96SJan Schmidt } 4213d7728c96SJan Schmidt 4214d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4215d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4216d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4217d7728c96SJan Schmidt ipa = NULL; 4218d7728c96SJan Schmidt goto out; 4219d7728c96SJan Schmidt } 4220d7728c96SJan Schmidt 4221d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4222d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4223d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4224d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4225d7728c96SJan Schmidt ipath = NULL; 4226d7728c96SJan Schmidt goto out; 4227d7728c96SJan Schmidt } 4228d7728c96SJan Schmidt 4229d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4230d7728c96SJan Schmidt if (ret < 0) 4231d7728c96SJan Schmidt goto out; 4232d7728c96SJan Schmidt 4233d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4234745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4235745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4236740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4237d7728c96SJan Schmidt } 4238d7728c96SJan Schmidt 42398cf96b40SAnand Jain btrfs_free_path(path); 42408cf96b40SAnand Jain path = NULL; 4241718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4242718dc5faSOmar Sandoval ipath->fspath, size); 4243d7728c96SJan Schmidt if (ret) { 4244d7728c96SJan Schmidt ret = -EFAULT; 4245d7728c96SJan Schmidt goto out; 4246d7728c96SJan Schmidt } 4247d7728c96SJan Schmidt 4248d7728c96SJan Schmidt out: 4249d7728c96SJan Schmidt btrfs_free_path(path); 4250d7728c96SJan Schmidt free_ipath(ipath); 4251d7728c96SJan Schmidt kfree(ipa); 4252d7728c96SJan Schmidt 4253d7728c96SJan Schmidt return ret; 4254d7728c96SJan Schmidt } 4255d7728c96SJan Schmidt 42562ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4257d24a67b2SZygo Blaxell void __user *arg, int version) 4258d7728c96SJan Schmidt { 4259d7728c96SJan Schmidt int ret = 0; 4260d7728c96SJan Schmidt int size; 4261d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4262d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4263d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4264d24a67b2SZygo Blaxell bool ignore_offset; 4265d7728c96SJan Schmidt 4266d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4267d7728c96SJan Schmidt return -EPERM; 4268d7728c96SJan Schmidt 4269d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 42707b9ea627SShailendra Verma if (IS_ERR(loi)) 42717b9ea627SShailendra Verma return PTR_ERR(loi); 4272d7728c96SJan Schmidt 4273d24a67b2SZygo Blaxell if (version == 1) { 4274d24a67b2SZygo Blaxell ignore_offset = false; 4275b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4276d24a67b2SZygo Blaxell } else { 4277d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4278d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4279d24a67b2SZygo Blaxell ret = -EINVAL; 4280d24a67b2SZygo Blaxell goto out_loi; 4281d24a67b2SZygo Blaxell } 4282d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4283d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4284d24a67b2SZygo Blaxell ret = -EINVAL; 4285d24a67b2SZygo Blaxell goto out_loi; 4286d24a67b2SZygo Blaxell } 4287d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4288b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4289d24a67b2SZygo Blaxell } 4290d24a67b2SZygo Blaxell 4291418ffb9eSAnand Jain inodes = init_data_container(size); 4292418ffb9eSAnand Jain if (IS_ERR(inodes)) { 4293418ffb9eSAnand Jain ret = PTR_ERR(inodes); 4294418ffb9eSAnand Jain goto out_loi; 4295418ffb9eSAnand Jain } 4296418ffb9eSAnand Jain 4297d7728c96SJan Schmidt path = btrfs_alloc_path(); 4298d7728c96SJan Schmidt if (!path) { 4299d7728c96SJan Schmidt ret = -ENOMEM; 4300d7728c96SJan Schmidt goto out; 4301d7728c96SJan Schmidt } 43022ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4303e3059ec0SDavid Sterba inodes, ignore_offset); 4304418ffb9eSAnand Jain btrfs_free_path(path); 4305df031f07SLiu Bo if (ret == -EINVAL) 4306d7728c96SJan Schmidt ret = -ENOENT; 4307d7728c96SJan Schmidt if (ret < 0) 4308d7728c96SJan Schmidt goto out; 4309d7728c96SJan Schmidt 4310718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4311718dc5faSOmar Sandoval size); 4312d7728c96SJan Schmidt if (ret) 4313d7728c96SJan Schmidt ret = -EFAULT; 4314d7728c96SJan Schmidt 4315d7728c96SJan Schmidt out: 4316f54de068SDavid Sterba kvfree(inodes); 4317d24a67b2SZygo Blaxell out_loi: 4318d7728c96SJan Schmidt kfree(loi); 4319d7728c96SJan Schmidt 4320d7728c96SJan Schmidt return ret; 4321d7728c96SJan Schmidt } 4322d7728c96SJan Schmidt 4323008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4324c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4325c9e9f97bSIlya Dryomov { 4326c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4327c9e9f97bSIlya Dryomov 4328c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4329c9e9f97bSIlya Dryomov 43303009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4331837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4332837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4333837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4334a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4335a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4336837d5b6eSIlya Dryomov 4337c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4338c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4339c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 434019a39dceSIlya Dryomov 434119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 434219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 434319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4344c9e9f97bSIlya Dryomov } 4345c9e9f97bSIlya Dryomov 43467fb10ed8SNikolay Borisov /** 43477fb10ed8SNikolay Borisov * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as 43487fb10ed8SNikolay Borisov * required. 43497fb10ed8SNikolay Borisov * 43507fb10ed8SNikolay Borisov * @fs_info: the filesystem 43517fb10ed8SNikolay Borisov * @excl_acquired: ptr to boolean value which is set to false in case balance 43527fb10ed8SNikolay Borisov * is being resumed 43537fb10ed8SNikolay Borisov * 43547fb10ed8SNikolay Borisov * Return 0 on success in which case both fs_info::balance is acquired as well 43557fb10ed8SNikolay Borisov * as exclusive ops are blocked. In case of failure return an error code. 43567fb10ed8SNikolay Borisov */ 43577fb10ed8SNikolay Borisov static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) 43587fb10ed8SNikolay Borisov { 43597fb10ed8SNikolay Borisov int ret; 43607fb10ed8SNikolay Borisov 43617fb10ed8SNikolay Borisov /* 43627fb10ed8SNikolay Borisov * Exclusive operation is locked. Three possibilities: 43637fb10ed8SNikolay Borisov * (1) some other op is running 43647fb10ed8SNikolay Borisov * (2) balance is running 43657fb10ed8SNikolay Borisov * (3) balance is paused -- special case (think resume) 43667fb10ed8SNikolay Borisov */ 43677fb10ed8SNikolay Borisov while (1) { 43687fb10ed8SNikolay Borisov if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 43697fb10ed8SNikolay Borisov *excl_acquired = true; 43707fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 43717fb10ed8SNikolay Borisov return 0; 43727fb10ed8SNikolay Borisov } 43737fb10ed8SNikolay Borisov 43747fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 43757fb10ed8SNikolay Borisov if (fs_info->balance_ctl) { 43767fb10ed8SNikolay Borisov /* This is either (2) or (3) */ 43777fb10ed8SNikolay Borisov if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 43787fb10ed8SNikolay Borisov /* This is (2) */ 43797fb10ed8SNikolay Borisov ret = -EINPROGRESS; 43807fb10ed8SNikolay Borisov goto out_failure; 43817fb10ed8SNikolay Borisov 43827fb10ed8SNikolay Borisov } else { 43837fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 43847fb10ed8SNikolay Borisov /* 43857fb10ed8SNikolay Borisov * Lock released to allow other waiters to 43867fb10ed8SNikolay Borisov * continue, we'll reexamine the status again. 43877fb10ed8SNikolay Borisov */ 43887fb10ed8SNikolay Borisov mutex_lock(&fs_info->balance_mutex); 43897fb10ed8SNikolay Borisov 43907fb10ed8SNikolay Borisov if (fs_info->balance_ctl && 43917fb10ed8SNikolay Borisov !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 43927fb10ed8SNikolay Borisov /* This is (3) */ 43937fb10ed8SNikolay Borisov *excl_acquired = false; 43947fb10ed8SNikolay Borisov return 0; 43957fb10ed8SNikolay Borisov } 43967fb10ed8SNikolay Borisov } 43977fb10ed8SNikolay Borisov } else { 43987fb10ed8SNikolay Borisov /* This is (1) */ 43997fb10ed8SNikolay Borisov ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 44007fb10ed8SNikolay Borisov goto out_failure; 44017fb10ed8SNikolay Borisov } 44027fb10ed8SNikolay Borisov 44037fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 44047fb10ed8SNikolay Borisov } 44057fb10ed8SNikolay Borisov 44067fb10ed8SNikolay Borisov out_failure: 44077fb10ed8SNikolay Borisov mutex_unlock(&fs_info->balance_mutex); 44087fb10ed8SNikolay Borisov *excl_acquired = false; 44097fb10ed8SNikolay Borisov return ret; 44107fb10ed8SNikolay Borisov } 44117fb10ed8SNikolay Borisov 44129ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4413c9e9f97bSIlya Dryomov { 4414496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4415c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4416c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4417c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4418099aa972SNikolay Borisov bool need_unlock = true; 4419c9e9f97bSIlya Dryomov int ret; 4420c9e9f97bSIlya Dryomov 4421c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4422c9e9f97bSIlya Dryomov return -EPERM; 4423c9e9f97bSIlya Dryomov 4424e54bfa31SLiu Bo ret = mnt_want_write_file(file); 44259ba1f6e4SLiu Bo if (ret) 44269ba1f6e4SLiu Bo return ret; 44279ba1f6e4SLiu Bo 4428d8645462SNikolay Borisov bargs = memdup_user(arg, sizeof(*bargs)); 4429d8645462SNikolay Borisov if (IS_ERR(bargs)) { 4430d8645462SNikolay Borisov ret = PTR_ERR(bargs); 4431d8645462SNikolay Borisov bargs = NULL; 4432d8645462SNikolay Borisov goto out; 4433d8645462SNikolay Borisov } 4434d8645462SNikolay Borisov 4435099aa972SNikolay Borisov ret = btrfs_try_lock_balance(fs_info, &need_unlock); 4436099aa972SNikolay Borisov if (ret) 4437ed0fb78fSIlya Dryomov goto out; 4438ed0fb78fSIlya Dryomov 4439099aa972SNikolay Borisov lockdep_assert_held(&fs_info->balance_mutex); 4440099aa972SNikolay Borisov 4441de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4442de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4443de322263SIlya Dryomov ret = -ENOTCONN; 4444d8645462SNikolay Borisov goto out_unlock; 4445de322263SIlya Dryomov } 4446de322263SIlya Dryomov 4447de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4448de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4449de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4450de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4451efc0e69cSNikolay Borisov btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); 4452de322263SIlya Dryomov 4453de322263SIlya Dryomov goto do_balance; 4454de322263SIlya Dryomov } 4455c9e9f97bSIlya Dryomov 4456d8645462SNikolay Borisov if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 4457d8645462SNikolay Borisov ret = -EINVAL; 4458d8645462SNikolay Borisov goto out_unlock; 4459c9e9f97bSIlya Dryomov } 4460c9e9f97bSIlya Dryomov 4461ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4462837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4463d8645462SNikolay Borisov goto out_unlock; 4464837d5b6eSIlya Dryomov } 4465837d5b6eSIlya Dryomov 44668d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4467c9e9f97bSIlya Dryomov if (!bctl) { 4468c9e9f97bSIlya Dryomov ret = -ENOMEM; 4469d8645462SNikolay Borisov goto out_unlock; 4470c9e9f97bSIlya Dryomov } 4471c9e9f97bSIlya Dryomov 4472c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4473c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4474c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4475c9e9f97bSIlya Dryomov 4476c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4477de322263SIlya Dryomov do_balance: 4478c9e9f97bSIlya Dryomov /* 4479c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4480c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4481c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4482c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4483c9e9f97bSIlya Dryomov */ 4484ed0fb78fSIlya Dryomov need_unlock = false; 4485ed0fb78fSIlya Dryomov 44866fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 44870f89abf5SChristian Engelmayer bctl = NULL; 4488ed0fb78fSIlya Dryomov 448939864601SNikolay Borisov if (ret == 0 || ret == -ECANCELED) { 4490c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4491c9e9f97bSIlya Dryomov ret = -EFAULT; 4492c9e9f97bSIlya Dryomov } 4493c9e9f97bSIlya Dryomov 44940f89abf5SChristian Engelmayer kfree(bctl); 4495ed0fb78fSIlya Dryomov out_unlock: 4496c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4497ed0fb78fSIlya Dryomov if (need_unlock) 4498c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4499ed0fb78fSIlya Dryomov out: 4500e54bfa31SLiu Bo mnt_drop_write_file(file); 4501d8645462SNikolay Borisov kfree(bargs); 4502c9e9f97bSIlya Dryomov return ret; 4503c9e9f97bSIlya Dryomov } 4504c9e9f97bSIlya Dryomov 45052ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4506837d5b6eSIlya Dryomov { 4507837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4508837d5b6eSIlya Dryomov return -EPERM; 4509837d5b6eSIlya Dryomov 4510837d5b6eSIlya Dryomov switch (cmd) { 4511837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 45120b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4513a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 45140b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4515837d5b6eSIlya Dryomov } 4516837d5b6eSIlya Dryomov 4517837d5b6eSIlya Dryomov return -EINVAL; 4518837d5b6eSIlya Dryomov } 4519837d5b6eSIlya Dryomov 45202ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 452119a39dceSIlya Dryomov void __user *arg) 452219a39dceSIlya Dryomov { 452319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 452419a39dceSIlya Dryomov int ret = 0; 452519a39dceSIlya Dryomov 452619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 452719a39dceSIlya Dryomov return -EPERM; 452819a39dceSIlya Dryomov 452919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 453019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 453119a39dceSIlya Dryomov ret = -ENOTCONN; 453219a39dceSIlya Dryomov goto out; 453319a39dceSIlya Dryomov } 453419a39dceSIlya Dryomov 45358d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 453619a39dceSIlya Dryomov if (!bargs) { 453719a39dceSIlya Dryomov ret = -ENOMEM; 453819a39dceSIlya Dryomov goto out; 453919a39dceSIlya Dryomov } 454019a39dceSIlya Dryomov 4541008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 454219a39dceSIlya Dryomov 454319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 454419a39dceSIlya Dryomov ret = -EFAULT; 454519a39dceSIlya Dryomov 454619a39dceSIlya Dryomov kfree(bargs); 454719a39dceSIlya Dryomov out: 454819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 454919a39dceSIlya Dryomov return ret; 455019a39dceSIlya Dryomov } 455119a39dceSIlya Dryomov 4552905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 45535d13a37bSArne Jansen { 45540b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45565d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 45575d13a37bSArne Jansen int ret; 45585d13a37bSArne Jansen 45595d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45605d13a37bSArne Jansen return -EPERM; 45615d13a37bSArne Jansen 4562905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4563905b0ddaSMiao Xie if (ret) 4564905b0ddaSMiao Xie return ret; 45655d13a37bSArne Jansen 45665d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4567905b0ddaSMiao Xie if (IS_ERR(sa)) { 4568905b0ddaSMiao Xie ret = PTR_ERR(sa); 4569905b0ddaSMiao Xie goto drop_write; 4570905b0ddaSMiao Xie } 45715d13a37bSArne Jansen 45720b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 45735d13a37bSArne Jansen 45745d13a37bSArne Jansen switch (sa->cmd) { 45755d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4576340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 45775d13a37bSArne Jansen break; 45785d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4579340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 45805d13a37bSArne Jansen break; 45815d13a37bSArne Jansen default: 45825d13a37bSArne Jansen ret = -EINVAL; 45835d13a37bSArne Jansen break; 45845d13a37bSArne Jansen } 45855d13a37bSArne Jansen 45865d13a37bSArne Jansen kfree(sa); 45870b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4588905b0ddaSMiao Xie drop_write: 4589905b0ddaSMiao Xie mnt_drop_write_file(file); 45905d13a37bSArne Jansen return ret; 45915d13a37bSArne Jansen } 45925d13a37bSArne Jansen 4593905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 45945d13a37bSArne Jansen { 45950b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45970b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45985d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 45995d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46005d13a37bSArne Jansen int ret; 46015d13a37bSArne Jansen int err; 46025d13a37bSArne Jansen 46035d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46045d13a37bSArne Jansen return -EPERM; 46055d13a37bSArne Jansen 4606905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4607905b0ddaSMiao Xie if (ret) 4608905b0ddaSMiao Xie return ret; 46095d13a37bSArne Jansen 46105d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4611905b0ddaSMiao Xie if (IS_ERR(sa)) { 4612905b0ddaSMiao Xie ret = PTR_ERR(sa); 4613905b0ddaSMiao Xie goto drop_write; 4614905b0ddaSMiao Xie } 46155d13a37bSArne Jansen 46165d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46175d13a37bSArne Jansen if (IS_ERR(trans)) { 46185d13a37bSArne Jansen ret = PTR_ERR(trans); 46195d13a37bSArne Jansen goto out; 46205d13a37bSArne Jansen } 46215d13a37bSArne Jansen 46225d13a37bSArne Jansen if (sa->assign) { 46239f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 46245d13a37bSArne Jansen } else { 462539616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 46265d13a37bSArne Jansen } 46275d13a37bSArne Jansen 4628e082f563SQu Wenruo /* update qgroup status and info */ 4629280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4630e082f563SQu Wenruo if (err < 0) 46310b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4632ad8403dfSAnand Jain "failed to update qgroup status and info"); 46333a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46345d13a37bSArne Jansen if (err && !ret) 46355d13a37bSArne Jansen ret = err; 46365d13a37bSArne Jansen 46375d13a37bSArne Jansen out: 46385d13a37bSArne Jansen kfree(sa); 4639905b0ddaSMiao Xie drop_write: 4640905b0ddaSMiao Xie mnt_drop_write_file(file); 46415d13a37bSArne Jansen return ret; 46425d13a37bSArne Jansen } 46435d13a37bSArne Jansen 4644905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 46455d13a37bSArne Jansen { 46460b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46470b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46485d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 46495d13a37bSArne Jansen struct btrfs_trans_handle *trans; 46505d13a37bSArne Jansen int ret; 46515d13a37bSArne Jansen int err; 46525d13a37bSArne Jansen 46535d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 46545d13a37bSArne Jansen return -EPERM; 46555d13a37bSArne Jansen 4656905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4657905b0ddaSMiao Xie if (ret) 4658905b0ddaSMiao Xie return ret; 46595d13a37bSArne Jansen 46605d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4661905b0ddaSMiao Xie if (IS_ERR(sa)) { 4662905b0ddaSMiao Xie ret = PTR_ERR(sa); 4663905b0ddaSMiao Xie goto drop_write; 4664905b0ddaSMiao Xie } 46655d13a37bSArne Jansen 4666d86e56cfSMiao Xie if (!sa->qgroupid) { 4667d86e56cfSMiao Xie ret = -EINVAL; 4668d86e56cfSMiao Xie goto out; 4669d86e56cfSMiao Xie } 4670d86e56cfSMiao Xie 46715d13a37bSArne Jansen trans = btrfs_join_transaction(root); 46725d13a37bSArne Jansen if (IS_ERR(trans)) { 46735d13a37bSArne Jansen ret = PTR_ERR(trans); 46745d13a37bSArne Jansen goto out; 46755d13a37bSArne Jansen } 46765d13a37bSArne Jansen 46775d13a37bSArne Jansen if (sa->create) { 467849a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 46795d13a37bSArne Jansen } else { 46803efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 46815d13a37bSArne Jansen } 46825d13a37bSArne Jansen 46833a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 46845d13a37bSArne Jansen if (err && !ret) 46855d13a37bSArne Jansen ret = err; 46865d13a37bSArne Jansen 46875d13a37bSArne Jansen out: 46885d13a37bSArne Jansen kfree(sa); 4689905b0ddaSMiao Xie drop_write: 4690905b0ddaSMiao Xie mnt_drop_write_file(file); 46915d13a37bSArne Jansen return ret; 46925d13a37bSArne Jansen } 46935d13a37bSArne Jansen 4694905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 46955d13a37bSArne Jansen { 46960b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46970b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46985d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 46995d13a37bSArne Jansen struct btrfs_trans_handle *trans; 47005d13a37bSArne Jansen int ret; 47015d13a37bSArne Jansen int err; 47025d13a37bSArne Jansen u64 qgroupid; 47035d13a37bSArne Jansen 47045d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 47055d13a37bSArne Jansen return -EPERM; 47065d13a37bSArne Jansen 4707905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4708905b0ddaSMiao Xie if (ret) 4709905b0ddaSMiao Xie return ret; 47105d13a37bSArne Jansen 47115d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4712905b0ddaSMiao Xie if (IS_ERR(sa)) { 4713905b0ddaSMiao Xie ret = PTR_ERR(sa); 4714905b0ddaSMiao Xie goto drop_write; 4715905b0ddaSMiao Xie } 47165d13a37bSArne Jansen 47175d13a37bSArne Jansen trans = btrfs_join_transaction(root); 47185d13a37bSArne Jansen if (IS_ERR(trans)) { 47195d13a37bSArne Jansen ret = PTR_ERR(trans); 47205d13a37bSArne Jansen goto out; 47215d13a37bSArne Jansen } 47225d13a37bSArne Jansen 47235d13a37bSArne Jansen qgroupid = sa->qgroupid; 47245d13a37bSArne Jansen if (!qgroupid) { 47255d13a37bSArne Jansen /* take the current subvol as qgroup */ 47265d13a37bSArne Jansen qgroupid = root->root_key.objectid; 47275d13a37bSArne Jansen } 47285d13a37bSArne Jansen 4729f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 47305d13a37bSArne Jansen 47313a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 47325d13a37bSArne Jansen if (err && !ret) 47335d13a37bSArne Jansen ret = err; 47345d13a37bSArne Jansen 47355d13a37bSArne Jansen out: 47365d13a37bSArne Jansen kfree(sa); 4737905b0ddaSMiao Xie drop_write: 4738905b0ddaSMiao Xie mnt_drop_write_file(file); 47395d13a37bSArne Jansen return ret; 47405d13a37bSArne Jansen } 47415d13a37bSArne Jansen 47422f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 47432f232036SJan Schmidt { 47440b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47450b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47462f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 47472f232036SJan Schmidt int ret; 47482f232036SJan Schmidt 47492f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47502f232036SJan Schmidt return -EPERM; 47512f232036SJan Schmidt 47522f232036SJan Schmidt ret = mnt_want_write_file(file); 47532f232036SJan Schmidt if (ret) 47542f232036SJan Schmidt return ret; 47552f232036SJan Schmidt 47562f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 47572f232036SJan Schmidt if (IS_ERR(qsa)) { 47582f232036SJan Schmidt ret = PTR_ERR(qsa); 47592f232036SJan Schmidt goto drop_write; 47602f232036SJan Schmidt } 47612f232036SJan Schmidt 47622f232036SJan Schmidt if (qsa->flags) { 47632f232036SJan Schmidt ret = -EINVAL; 47642f232036SJan Schmidt goto out; 47652f232036SJan Schmidt } 47662f232036SJan Schmidt 47670b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 47682f232036SJan Schmidt 47692f232036SJan Schmidt out: 47702f232036SJan Schmidt kfree(qsa); 47712f232036SJan Schmidt drop_write: 47722f232036SJan Schmidt mnt_drop_write_file(file); 47732f232036SJan Schmidt return ret; 47742f232036SJan Schmidt } 47752f232036SJan Schmidt 4776b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4777b929c1d8SMarcos Paulo de Souza void __user *arg) 47782f232036SJan Schmidt { 47790afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 47802f232036SJan Schmidt 47812f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 47822f232036SJan Schmidt return -EPERM; 47832f232036SJan Schmidt 47840b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 47850afb603aSGoldwyn Rodrigues qsa.flags = 1; 47860afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 47872f232036SJan Schmidt } 47882f232036SJan Schmidt 47890afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4790991a3daeSAnand Jain return -EFAULT; 47912f232036SJan Schmidt 4792991a3daeSAnand Jain return 0; 47932f232036SJan Schmidt } 47942f232036SJan Schmidt 4795b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4796b929c1d8SMarcos Paulo de Souza void __user *arg) 479757254b6eSJan Schmidt { 479857254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 479957254b6eSJan Schmidt return -EPERM; 480057254b6eSJan Schmidt 48010b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 480257254b6eSJan Schmidt } 480357254b6eSJan Schmidt 4804abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4805e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4806abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 48078ea05e3aSAlexander Block { 4808496ad9aaSAl Viro struct inode *inode = file_inode(file); 48090b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48108ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 48118ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 48128ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 481395582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 48148ea05e3aSAlexander Block int ret = 0; 4815dd5f9615SStefan Behrens int received_uuid_changed; 48168ea05e3aSAlexander Block 4817e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4818bd60ea0fSDavid Sterba return -EPERM; 4819bd60ea0fSDavid Sterba 48208ea05e3aSAlexander Block ret = mnt_want_write_file(file); 48218ea05e3aSAlexander Block if (ret < 0) 48228ea05e3aSAlexander Block return ret; 48238ea05e3aSAlexander Block 48240b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 48258ea05e3aSAlexander Block 48264a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 48278ea05e3aSAlexander Block ret = -EINVAL; 48288ea05e3aSAlexander Block goto out; 48298ea05e3aSAlexander Block } 48308ea05e3aSAlexander Block 48318ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 48328ea05e3aSAlexander Block ret = -EROFS; 48338ea05e3aSAlexander Block goto out; 48348ea05e3aSAlexander Block } 48358ea05e3aSAlexander Block 4836dd5f9615SStefan Behrens /* 4837dd5f9615SStefan Behrens * 1 - root item 4838dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4839dd5f9615SStefan Behrens */ 4840dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 48418ea05e3aSAlexander Block if (IS_ERR(trans)) { 48428ea05e3aSAlexander Block ret = PTR_ERR(trans); 48438ea05e3aSAlexander Block trans = NULL; 48448ea05e3aSAlexander Block goto out; 48458ea05e3aSAlexander Block } 48468ea05e3aSAlexander Block 48478ea05e3aSAlexander Block sa->rtransid = trans->transid; 48488ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 48498ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 48508ea05e3aSAlexander Block 4851dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4852dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4853dd5f9615SStefan Behrens if (received_uuid_changed && 4854d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4855d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4856dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4857dd5f9615SStefan Behrens root->root_key.objectid); 4858d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4859d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4860d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4861d87ff758SNikolay Borisov goto out; 4862d87ff758SNikolay Borisov } 4863d87ff758SNikolay Borisov } 48648ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 48658ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 48668ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 48673cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 48683cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 48693cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 48703cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 48718ea05e3aSAlexander Block 48720b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 48738ea05e3aSAlexander Block &root->root_key, &root->root_item); 48748ea05e3aSAlexander Block if (ret < 0) { 48753a45bb20SJeff Mahoney btrfs_end_transaction(trans); 48768ea05e3aSAlexander Block goto out; 4877dd5f9615SStefan Behrens } 4878dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4879cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4880dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4881dd5f9615SStefan Behrens root->root_key.objectid); 4882dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 488366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4884efd38150SNikolay Borisov btrfs_end_transaction(trans); 4885dd5f9615SStefan Behrens goto out; 4886dd5f9615SStefan Behrens } 4887dd5f9615SStefan Behrens } 48883a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4889abccd00fSHugo Mills out: 48900b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4891abccd00fSHugo Mills mnt_drop_write_file(file); 4892abccd00fSHugo Mills return ret; 4893abccd00fSHugo Mills } 4894abccd00fSHugo Mills 4895abccd00fSHugo Mills #ifdef CONFIG_64BIT 4896abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4897abccd00fSHugo Mills void __user *arg) 4898abccd00fSHugo Mills { 4899abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4900abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4901abccd00fSHugo Mills int ret = 0; 4902abccd00fSHugo Mills 4903abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 49047b9ea627SShailendra Verma if (IS_ERR(args32)) 49057b9ea627SShailendra Verma return PTR_ERR(args32); 4906abccd00fSHugo Mills 49078d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 490884dbeb87SDan Carpenter if (!args64) { 490984dbeb87SDan Carpenter ret = -ENOMEM; 4910abccd00fSHugo Mills goto out; 4911abccd00fSHugo Mills } 4912abccd00fSHugo Mills 4913abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4914abccd00fSHugo Mills args64->stransid = args32->stransid; 4915abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4916abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4917abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4918abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4919abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4920abccd00fSHugo Mills args64->flags = args32->flags; 4921abccd00fSHugo Mills 4922e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4923abccd00fSHugo Mills if (ret) 4924abccd00fSHugo Mills goto out; 4925abccd00fSHugo Mills 4926abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4927abccd00fSHugo Mills args32->stransid = args64->stransid; 4928abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4929abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4930abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4931abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4932abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4933abccd00fSHugo Mills args32->flags = args64->flags; 4934abccd00fSHugo Mills 4935abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4936abccd00fSHugo Mills if (ret) 4937abccd00fSHugo Mills ret = -EFAULT; 4938abccd00fSHugo Mills 4939abccd00fSHugo Mills out: 4940abccd00fSHugo Mills kfree(args32); 4941abccd00fSHugo Mills kfree(args64); 4942abccd00fSHugo Mills return ret; 4943abccd00fSHugo Mills } 4944abccd00fSHugo Mills #endif 4945abccd00fSHugo Mills 4946abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4947abccd00fSHugo Mills void __user *arg) 4948abccd00fSHugo Mills { 4949abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4950abccd00fSHugo Mills int ret = 0; 4951abccd00fSHugo Mills 4952abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 49537b9ea627SShailendra Verma if (IS_ERR(sa)) 49547b9ea627SShailendra Verma return PTR_ERR(sa); 4955abccd00fSHugo Mills 4956e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4957abccd00fSHugo Mills 4958abccd00fSHugo Mills if (ret) 4959abccd00fSHugo Mills goto out; 4960abccd00fSHugo Mills 49618ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 49628ea05e3aSAlexander Block if (ret) 49638ea05e3aSAlexander Block ret = -EFAULT; 49648ea05e3aSAlexander Block 49658ea05e3aSAlexander Block out: 49668ea05e3aSAlexander Block kfree(sa); 49678ea05e3aSAlexander Block return ret; 49688ea05e3aSAlexander Block } 49698ea05e3aSAlexander Block 4970b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4971b929c1d8SMarcos Paulo de Souza void __user *arg) 4972867ab667Sjeff.liu { 4973a1b83ac5SAnand Jain size_t len; 4974867ab667Sjeff.liu int ret; 4975a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4976a1b83ac5SAnand Jain 49770b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 49780b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 49790b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4980a1b83ac5SAnand Jain 4981a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4982867ab667Sjeff.liu 4983867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 49840b246afaSJeff Mahoney btrfs_warn(fs_info, 49850b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 49860b246afaSJeff Mahoney --len); 4987867ab667Sjeff.liu } 4988867ab667Sjeff.liu 4989867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4990867ab667Sjeff.liu 4991867ab667Sjeff.liu return ret ? -EFAULT : 0; 4992867ab667Sjeff.liu } 4993867ab667Sjeff.liu 4994a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4995a8bfd4abSjeff.liu { 49960b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49970b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49980b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49990b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 5000a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 5001a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 5002a8bfd4abSjeff.liu int ret; 5003a8bfd4abSjeff.liu 5004a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 5005a8bfd4abSjeff.liu return -EPERM; 5006a8bfd4abSjeff.liu 5007a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 5008a8bfd4abSjeff.liu return -EFAULT; 5009a8bfd4abSjeff.liu 5010a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 50110b246afaSJeff Mahoney btrfs_err(fs_info, 50125d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 5013a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 5014a8bfd4abSjeff.liu return -EINVAL; 5015a8bfd4abSjeff.liu } 5016a8bfd4abSjeff.liu 5017a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 5018a8bfd4abSjeff.liu if (ret) 5019a8bfd4abSjeff.liu return ret; 5020a8bfd4abSjeff.liu 5021a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 5022a8bfd4abSjeff.liu if (IS_ERR(trans)) { 5023a8bfd4abSjeff.liu ret = PTR_ERR(trans); 5024a8bfd4abSjeff.liu goto out_unlock; 5025a8bfd4abSjeff.liu } 5026a8bfd4abSjeff.liu 50270b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 5028a8bfd4abSjeff.liu strcpy(super_block->label, label); 50290b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50303a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 5031a8bfd4abSjeff.liu 5032a8bfd4abSjeff.liu out_unlock: 5033a8bfd4abSjeff.liu mnt_drop_write_file(file); 5034a8bfd4abSjeff.liu return ret; 5035a8bfd4abSjeff.liu } 5036a8bfd4abSjeff.liu 50372eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 50382eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 50392eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 50402eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 50412eaa055fSJeff Mahoney 5042d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 50432eaa055fSJeff Mahoney { 50444d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 50452eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 50462eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 50472eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 50482eaa055fSJeff Mahoney }; 50492eaa055fSJeff Mahoney 50502eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50512eaa055fSJeff Mahoney return -EFAULT; 50522eaa055fSJeff Mahoney 50532eaa055fSJeff Mahoney return 0; 50542eaa055fSJeff Mahoney } 50552eaa055fSJeff Mahoney 5056b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 5057b929c1d8SMarcos Paulo de Souza void __user *arg) 50582eaa055fSJeff Mahoney { 50590b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 50602eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 50612eaa055fSJeff Mahoney 50622eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 50632eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 50642eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 50652eaa055fSJeff Mahoney 50662eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 50672eaa055fSJeff Mahoney return -EFAULT; 50682eaa055fSJeff Mahoney 50692eaa055fSJeff Mahoney return 0; 50702eaa055fSJeff Mahoney } 50712eaa055fSJeff Mahoney 50722ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 50733b02a68aSJeff Mahoney enum btrfs_feature_set set, 50742eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 50752eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 50762eaa055fSJeff Mahoney { 5077f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 50783b02a68aSJeff Mahoney char *names; 50792eaa055fSJeff Mahoney u64 disallowed, unsupported; 50802eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 50812eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 50822eaa055fSJeff Mahoney 50832eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 50842eaa055fSJeff Mahoney if (unsupported) { 50853b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 50863b02a68aSJeff Mahoney if (names) { 50870b246afaSJeff Mahoney btrfs_warn(fs_info, 50883b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 50893b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 50903b02a68aSJeff Mahoney kfree(names); 50913b02a68aSJeff Mahoney } else 50920b246afaSJeff Mahoney btrfs_warn(fs_info, 50932eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 50942eaa055fSJeff Mahoney type, unsupported); 50952eaa055fSJeff Mahoney return -EOPNOTSUPP; 50962eaa055fSJeff Mahoney } 50972eaa055fSJeff Mahoney 50982eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 50992eaa055fSJeff Mahoney if (disallowed) { 51003b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51013b02a68aSJeff Mahoney if (names) { 51020b246afaSJeff Mahoney btrfs_warn(fs_info, 51033b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 51043b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51053b02a68aSJeff Mahoney kfree(names); 51063b02a68aSJeff Mahoney } else 51070b246afaSJeff Mahoney btrfs_warn(fs_info, 51082eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 51092eaa055fSJeff Mahoney type, disallowed); 51102eaa055fSJeff Mahoney return -EPERM; 51112eaa055fSJeff Mahoney } 51122eaa055fSJeff Mahoney 51132eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 51142eaa055fSJeff Mahoney if (disallowed) { 51153b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 51163b02a68aSJeff Mahoney if (names) { 51170b246afaSJeff Mahoney btrfs_warn(fs_info, 51183b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 51193b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 51203b02a68aSJeff Mahoney kfree(names); 51213b02a68aSJeff Mahoney } else 51220b246afaSJeff Mahoney btrfs_warn(fs_info, 51232eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 51242eaa055fSJeff Mahoney type, disallowed); 51252eaa055fSJeff Mahoney return -EPERM; 51262eaa055fSJeff Mahoney } 51272eaa055fSJeff Mahoney 51282eaa055fSJeff Mahoney return 0; 51292eaa055fSJeff Mahoney } 51302eaa055fSJeff Mahoney 51312ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 51322ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 51332eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 51342eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 51352eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 51362eaa055fSJeff Mahoney 51372eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 51382eaa055fSJeff Mahoney { 51390b246afaSJeff Mahoney struct inode *inode = file_inode(file); 51400b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 51410b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 51420b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 51432eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 51442eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 51452eaa055fSJeff Mahoney u64 newflags; 51462eaa055fSJeff Mahoney int ret; 51472eaa055fSJeff Mahoney 51482eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 51492eaa055fSJeff Mahoney return -EPERM; 51502eaa055fSJeff Mahoney 51512eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 51522eaa055fSJeff Mahoney return -EFAULT; 51532eaa055fSJeff Mahoney 51542eaa055fSJeff Mahoney /* Nothing to do */ 51552eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 51562eaa055fSJeff Mahoney !flags[0].incompat_flags) 51572eaa055fSJeff Mahoney return 0; 51582eaa055fSJeff Mahoney 51592ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 51602eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 51612eaa055fSJeff Mahoney if (ret) 51622eaa055fSJeff Mahoney return ret; 51632eaa055fSJeff Mahoney 51642ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 51652eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 51662eaa055fSJeff Mahoney if (ret) 51672eaa055fSJeff Mahoney return ret; 51682eaa055fSJeff Mahoney 51692ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 51702eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 51712eaa055fSJeff Mahoney if (ret) 51722eaa055fSJeff Mahoney return ret; 51732eaa055fSJeff Mahoney 51747ab19625SDavid Sterba ret = mnt_want_write_file(file); 51757ab19625SDavid Sterba if (ret) 51767ab19625SDavid Sterba return ret; 51777ab19625SDavid Sterba 51788051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 51797ab19625SDavid Sterba if (IS_ERR(trans)) { 51807ab19625SDavid Sterba ret = PTR_ERR(trans); 51817ab19625SDavid Sterba goto out_drop_write; 51827ab19625SDavid Sterba } 51832eaa055fSJeff Mahoney 51840b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 51852eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 51862eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 51872eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 51882eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 51892eaa055fSJeff Mahoney 51902eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 51912eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 51922eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 51932eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 51942eaa055fSJeff Mahoney 51952eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 51962eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 51972eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 51982eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 51990b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 52002eaa055fSJeff Mahoney 52013a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 52027ab19625SDavid Sterba out_drop_write: 52037ab19625SDavid Sterba mnt_drop_write_file(file); 52047ab19625SDavid Sterba 52057ab19625SDavid Sterba return ret; 52062eaa055fSJeff Mahoney } 52072eaa055fSJeff Mahoney 52089ad12305SSahil Kang static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) 52092351f431SJosef Bacik { 52102351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 52112351f431SJosef Bacik int ret; 52122351f431SJosef Bacik 52132351f431SJosef Bacik if (compat) { 52142351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52152351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 52162351f431SJosef Bacik 52172351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 52182351f431SJosef Bacik if (ret) 52192351f431SJosef Bacik return -EFAULT; 52202351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 52212351f431SJosef Bacik if (!arg) 52222351f431SJosef Bacik return -ENOMEM; 52232351f431SJosef Bacik arg->send_fd = args32.send_fd; 52242351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 52252351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 52262351f431SJosef Bacik arg->parent_root = args32.parent_root; 52272351f431SJosef Bacik arg->flags = args32.flags; 52282351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 52292351f431SJosef Bacik sizeof(args32.reserved)); 52302351f431SJosef Bacik #else 52312351f431SJosef Bacik return -ENOTTY; 52322351f431SJosef Bacik #endif 52332351f431SJosef Bacik } else { 52342351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 52352351f431SJosef Bacik if (IS_ERR(arg)) 52362351f431SJosef Bacik return PTR_ERR(arg); 52372351f431SJosef Bacik } 52389ad12305SSahil Kang ret = btrfs_ioctl_send(inode, arg); 52392351f431SJosef Bacik kfree(arg); 52402351f431SJosef Bacik return ret; 52412351f431SJosef Bacik } 52422351f431SJosef Bacik 52431881fba8SOmar Sandoval static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, 52441881fba8SOmar Sandoval bool compat) 52451881fba8SOmar Sandoval { 52461881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args args = { 0 }; 52471881fba8SOmar Sandoval size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, 52481881fba8SOmar Sandoval flags); 52491881fba8SOmar Sandoval size_t copy_end; 52501881fba8SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 52511881fba8SOmar Sandoval struct iovec *iov = iovstack; 52521881fba8SOmar Sandoval struct iov_iter iter; 52531881fba8SOmar Sandoval loff_t pos; 52541881fba8SOmar Sandoval struct kiocb kiocb; 52551881fba8SOmar Sandoval ssize_t ret; 52561881fba8SOmar Sandoval 52571881fba8SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 52581881fba8SOmar Sandoval ret = -EPERM; 52591881fba8SOmar Sandoval goto out_acct; 52601881fba8SOmar Sandoval } 52611881fba8SOmar Sandoval 52621881fba8SOmar Sandoval if (compat) { 52631881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 52641881fba8SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 52651881fba8SOmar Sandoval 52661881fba8SOmar Sandoval copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, 52671881fba8SOmar Sandoval flags); 52681881fba8SOmar Sandoval if (copy_from_user(&args32, argp, copy_end)) { 52691881fba8SOmar Sandoval ret = -EFAULT; 52701881fba8SOmar Sandoval goto out_acct; 52711881fba8SOmar Sandoval } 52721881fba8SOmar Sandoval args.iov = compat_ptr(args32.iov); 52731881fba8SOmar Sandoval args.iovcnt = args32.iovcnt; 52741881fba8SOmar Sandoval args.offset = args32.offset; 52751881fba8SOmar Sandoval args.flags = args32.flags; 52761881fba8SOmar Sandoval #else 52771881fba8SOmar Sandoval return -ENOTTY; 52781881fba8SOmar Sandoval #endif 52791881fba8SOmar Sandoval } else { 52801881fba8SOmar Sandoval copy_end = copy_end_kernel; 52811881fba8SOmar Sandoval if (copy_from_user(&args, argp, copy_end)) { 52821881fba8SOmar Sandoval ret = -EFAULT; 52831881fba8SOmar Sandoval goto out_acct; 52841881fba8SOmar Sandoval } 52851881fba8SOmar Sandoval } 52861881fba8SOmar Sandoval if (args.flags != 0) { 52871881fba8SOmar Sandoval ret = -EINVAL; 52881881fba8SOmar Sandoval goto out_acct; 52891881fba8SOmar Sandoval } 52901881fba8SOmar Sandoval 52911881fba8SOmar Sandoval ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 52921881fba8SOmar Sandoval &iov, &iter); 52931881fba8SOmar Sandoval if (ret < 0) 52941881fba8SOmar Sandoval goto out_acct; 52951881fba8SOmar Sandoval 52961881fba8SOmar Sandoval if (iov_iter_count(&iter) == 0) { 52971881fba8SOmar Sandoval ret = 0; 52981881fba8SOmar Sandoval goto out_iov; 52991881fba8SOmar Sandoval } 53001881fba8SOmar Sandoval pos = args.offset; 53011881fba8SOmar Sandoval ret = rw_verify_area(READ, file, &pos, args.len); 53021881fba8SOmar Sandoval if (ret < 0) 53031881fba8SOmar Sandoval goto out_iov; 53041881fba8SOmar Sandoval 53051881fba8SOmar Sandoval init_sync_kiocb(&kiocb, file); 53061881fba8SOmar Sandoval kiocb.ki_pos = pos; 53071881fba8SOmar Sandoval 53081881fba8SOmar Sandoval ret = btrfs_encoded_read(&kiocb, &iter, &args); 53091881fba8SOmar Sandoval if (ret >= 0) { 53101881fba8SOmar Sandoval fsnotify_access(file); 53111881fba8SOmar Sandoval if (copy_to_user(argp + copy_end, 53121881fba8SOmar Sandoval (char *)&args + copy_end_kernel, 53131881fba8SOmar Sandoval sizeof(args) - copy_end_kernel)) 53141881fba8SOmar Sandoval ret = -EFAULT; 53151881fba8SOmar Sandoval } 53161881fba8SOmar Sandoval 53171881fba8SOmar Sandoval out_iov: 53181881fba8SOmar Sandoval kfree(iov); 53191881fba8SOmar Sandoval out_acct: 53201881fba8SOmar Sandoval if (ret > 0) 53211881fba8SOmar Sandoval add_rchar(current, ret); 53221881fba8SOmar Sandoval inc_syscr(current); 53231881fba8SOmar Sandoval return ret; 53241881fba8SOmar Sandoval } 53251881fba8SOmar Sandoval 53267c0c7269SOmar Sandoval static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) 53277c0c7269SOmar Sandoval { 53287c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args args; 53297c0c7269SOmar Sandoval struct iovec iovstack[UIO_FASTIOV]; 53307c0c7269SOmar Sandoval struct iovec *iov = iovstack; 53317c0c7269SOmar Sandoval struct iov_iter iter; 53327c0c7269SOmar Sandoval loff_t pos; 53337c0c7269SOmar Sandoval struct kiocb kiocb; 53347c0c7269SOmar Sandoval ssize_t ret; 53357c0c7269SOmar Sandoval 53367c0c7269SOmar Sandoval if (!capable(CAP_SYS_ADMIN)) { 53377c0c7269SOmar Sandoval ret = -EPERM; 53387c0c7269SOmar Sandoval goto out_acct; 53397c0c7269SOmar Sandoval } 53407c0c7269SOmar Sandoval 53417c0c7269SOmar Sandoval if (!(file->f_mode & FMODE_WRITE)) { 53427c0c7269SOmar Sandoval ret = -EBADF; 53437c0c7269SOmar Sandoval goto out_acct; 53447c0c7269SOmar Sandoval } 53457c0c7269SOmar Sandoval 53467c0c7269SOmar Sandoval if (compat) { 53477c0c7269SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 53487c0c7269SOmar Sandoval struct btrfs_ioctl_encoded_io_args_32 args32; 53497c0c7269SOmar Sandoval 53507c0c7269SOmar Sandoval if (copy_from_user(&args32, argp, sizeof(args32))) { 53517c0c7269SOmar Sandoval ret = -EFAULT; 53527c0c7269SOmar Sandoval goto out_acct; 53537c0c7269SOmar Sandoval } 53547c0c7269SOmar Sandoval args.iov = compat_ptr(args32.iov); 53557c0c7269SOmar Sandoval args.iovcnt = args32.iovcnt; 53567c0c7269SOmar Sandoval args.offset = args32.offset; 53577c0c7269SOmar Sandoval args.flags = args32.flags; 53587c0c7269SOmar Sandoval args.len = args32.len; 53597c0c7269SOmar Sandoval args.unencoded_len = args32.unencoded_len; 53607c0c7269SOmar Sandoval args.unencoded_offset = args32.unencoded_offset; 53617c0c7269SOmar Sandoval args.compression = args32.compression; 53627c0c7269SOmar Sandoval args.encryption = args32.encryption; 53637c0c7269SOmar Sandoval memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); 53647c0c7269SOmar Sandoval #else 53657c0c7269SOmar Sandoval return -ENOTTY; 53667c0c7269SOmar Sandoval #endif 53677c0c7269SOmar Sandoval } else { 53687c0c7269SOmar Sandoval if (copy_from_user(&args, argp, sizeof(args))) { 53697c0c7269SOmar Sandoval ret = -EFAULT; 53707c0c7269SOmar Sandoval goto out_acct; 53717c0c7269SOmar Sandoval } 53727c0c7269SOmar Sandoval } 53737c0c7269SOmar Sandoval 53747c0c7269SOmar Sandoval ret = -EINVAL; 53757c0c7269SOmar Sandoval if (args.flags != 0) 53767c0c7269SOmar Sandoval goto out_acct; 53777c0c7269SOmar Sandoval if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) 53787c0c7269SOmar Sandoval goto out_acct; 53797c0c7269SOmar Sandoval if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && 53807c0c7269SOmar Sandoval args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) 53817c0c7269SOmar Sandoval goto out_acct; 53827c0c7269SOmar Sandoval if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || 53837c0c7269SOmar Sandoval args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) 53847c0c7269SOmar Sandoval goto out_acct; 53857c0c7269SOmar Sandoval if (args.unencoded_offset > args.unencoded_len) 53867c0c7269SOmar Sandoval goto out_acct; 53877c0c7269SOmar Sandoval if (args.len > args.unencoded_len - args.unencoded_offset) 53887c0c7269SOmar Sandoval goto out_acct; 53897c0c7269SOmar Sandoval 53907c0c7269SOmar Sandoval ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), 53917c0c7269SOmar Sandoval &iov, &iter); 53927c0c7269SOmar Sandoval if (ret < 0) 53937c0c7269SOmar Sandoval goto out_acct; 53947c0c7269SOmar Sandoval 53957c0c7269SOmar Sandoval file_start_write(file); 53967c0c7269SOmar Sandoval 53977c0c7269SOmar Sandoval if (iov_iter_count(&iter) == 0) { 53987c0c7269SOmar Sandoval ret = 0; 53997c0c7269SOmar Sandoval goto out_end_write; 54007c0c7269SOmar Sandoval } 54017c0c7269SOmar Sandoval pos = args.offset; 54027c0c7269SOmar Sandoval ret = rw_verify_area(WRITE, file, &pos, args.len); 54037c0c7269SOmar Sandoval if (ret < 0) 54047c0c7269SOmar Sandoval goto out_end_write; 54057c0c7269SOmar Sandoval 54067c0c7269SOmar Sandoval init_sync_kiocb(&kiocb, file); 54077c0c7269SOmar Sandoval ret = kiocb_set_rw_flags(&kiocb, 0); 54087c0c7269SOmar Sandoval if (ret) 54097c0c7269SOmar Sandoval goto out_end_write; 54107c0c7269SOmar Sandoval kiocb.ki_pos = pos; 54117c0c7269SOmar Sandoval 54127c0c7269SOmar Sandoval ret = btrfs_do_write_iter(&kiocb, &iter, &args); 54137c0c7269SOmar Sandoval if (ret > 0) 54147c0c7269SOmar Sandoval fsnotify_modify(file); 54157c0c7269SOmar Sandoval 54167c0c7269SOmar Sandoval out_end_write: 54177c0c7269SOmar Sandoval file_end_write(file); 54187c0c7269SOmar Sandoval kfree(iov); 54197c0c7269SOmar Sandoval out_acct: 54207c0c7269SOmar Sandoval if (ret > 0) 54217c0c7269SOmar Sandoval add_wchar(current, ret); 54227c0c7269SOmar Sandoval inc_syscw(current); 54237c0c7269SOmar Sandoval return ret; 54247c0c7269SOmar Sandoval } 54257c0c7269SOmar Sandoval 5426f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5427f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5428f46b5a66SChristoph Hellwig { 54290b246afaSJeff Mahoney struct inode *inode = file_inode(file); 54300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 54310b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 54324bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5433f46b5a66SChristoph Hellwig 5434f46b5a66SChristoph Hellwig switch (cmd) { 54356cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 5436dc408ccdSSahil Kang return btrfs_ioctl_getversion(inode, argp); 543740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5438b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 543940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 544040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5441f7039b1dSLi Dongyang case FITRIM: 5442b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5443f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5444fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5445fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5446fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 54473de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5448fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 54496f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 54506f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 545176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5452949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5453949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5454949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 54550caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 54569ad12305SSahil Kang return btrfs_ioctl_subvol_getflags(inode, argp); 54570caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 54580caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 54596ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 54606ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5461f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 54621e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 54631e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 54641e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5465f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5466198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5467f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 54682ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5469f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5470da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 54716b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 54726b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5473475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 54742ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5475475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 54762ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5477ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 54789ad12305SSahil Kang return btrfs_ioctl_tree_search(inode, argp); 5479cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 54809ad12305SSahil Kang return btrfs_ioctl_tree_search_v2(inode, argp); 5481ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5482dc408ccdSSahil Kang return btrfs_ioctl_ino_lookup(root, argp); 5483d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5484d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5485d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5486d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5487d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5488d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 54891406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 54902ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 54919b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 54929b199859SFilipe David Borba Manana int ret; 54939b199859SFilipe David Borba Manana 54949db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 54959b199859SFilipe David Borba Manana if (ret) 54969b199859SFilipe David Borba Manana return ret; 54970b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 54982fad4e83SDavid Sterba /* 54992fad4e83SDavid Sterba * The transaction thread may want to do more work, 550001327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 55012fad4e83SDavid Sterba * processing uncleaned subvols. 55022fad4e83SDavid Sterba */ 55030b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 55049b199859SFilipe David Borba Manana return ret; 55059b199859SFilipe David Borba Manana } 550646204592SSage Weil case BTRFS_IOC_START_SYNC: 55079a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 550846204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 55092ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5510475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5511b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5512475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 55132ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5514475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 55152ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5516c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 55179ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5518837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 55192ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 552019a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 55212ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 55228ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 55238ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5524abccd00fSHugo Mills #ifdef CONFIG_64BIT 5525abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5526abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5527abccd00fSHugo Mills #endif 552831db9f7cSAlexander Block case BTRFS_IOC_SEND: 55299ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, false); 55302351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55312351f431SJosef Bacik case BTRFS_IOC_SEND_32: 55329ad12305SSahil Kang return _btrfs_ioctl_send(inode, argp, true); 55332351f431SJosef Bacik #endif 5534c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 55352ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 55365d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5537905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 55385d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5539905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 55405d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5541905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 55425d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5543905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 55442f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 55452f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 55462f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5547b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 554857254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5549b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 55503f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 55512ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 55522eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5553d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 55542eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5555b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 55562eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 55572eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5558b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 55599ad12305SSahil Kang return btrfs_ioctl_get_subvol_info(inode, argp); 556042e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 5561dc408ccdSSahil Kang return btrfs_ioctl_get_subvol_rootref(root, argp); 556223d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 556323d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 556414605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 556514605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 556614605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 556714605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 55681881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ: 55691881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, false); 55707c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE: 55717c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, false); 55721881fba8SOmar Sandoval #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 55731881fba8SOmar Sandoval case BTRFS_IOC_ENCODED_READ_32: 55741881fba8SOmar Sandoval return btrfs_ioctl_encoded_read(file, argp, true); 55757c0c7269SOmar Sandoval case BTRFS_IOC_ENCODED_WRITE_32: 55767c0c7269SOmar Sandoval return btrfs_ioctl_encoded_write(file, argp, true); 55771881fba8SOmar Sandoval #endif 5578f46b5a66SChristoph Hellwig } 5579f46b5a66SChristoph Hellwig 5580f46b5a66SChristoph Hellwig return -ENOTTY; 5581f46b5a66SChristoph Hellwig } 55824c63c245SLuke Dashjr 55834c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 55844c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 55854c63c245SLuke Dashjr { 55862a362249SJeff Mahoney /* 55872a362249SJeff Mahoney * These all access 32-bit values anyway so no further 55882a362249SJeff Mahoney * handling is necessary. 55892a362249SJeff Mahoney */ 55904c63c245SLuke Dashjr switch (cmd) { 55914c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 55924c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 55934c63c245SLuke Dashjr break; 55944c63c245SLuke Dashjr } 55954c63c245SLuke Dashjr 55964c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 55974c63c245SLuke Dashjr } 55984c63c245SLuke Dashjr #endif 5599