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> 31f46b5a66SChristoph Hellwig #include "ctree.h" 32f46b5a66SChristoph Hellwig #include "disk-io.h" 33949964c9SMarcos Paulo de Souza #include "export.h" 34f46b5a66SChristoph Hellwig #include "transaction.h" 35f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 36f46b5a66SChristoph Hellwig #include "print-tree.h" 37f46b5a66SChristoph Hellwig #include "volumes.h" 38925baeddSChris Mason #include "locking.h" 39d7728c96SJan Schmidt #include "backref.h" 40606686eeSJosef Bacik #include "rcu-string.h" 4131db9f7cSAlexander Block #include "send.h" 423f6bcfbdSStefan Behrens #include "dev-replace.h" 4363541927SFilipe David Borba Manana #include "props.h" 443b02a68aSJeff Mahoney #include "sysfs.h" 45fcebe456SJosef Bacik #include "qgroup.h" 461ec9a1aeSFilipe Manana #include "tree-log.h" 47ebb8765bSAnand Jain #include "compression.h" 488719aaaeSJosef Bacik #include "space-info.h" 4986736342SJosef Bacik #include "delalloc-space.h" 50aac0023cSJosef Bacik #include "block-group.h" 51f46b5a66SChristoph Hellwig 52abccd00fSHugo Mills #ifdef CONFIG_64BIT 53abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 54abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 55abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 56abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 57abccd00fSHugo Mills */ 58abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 59abccd00fSHugo Mills __u64 sec; 60abccd00fSHugo Mills __u32 nsec; 61abccd00fSHugo Mills } __attribute__ ((__packed__)); 62abccd00fSHugo Mills 63abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 64abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 65abccd00fSHugo Mills __u64 stransid; /* in */ 66abccd00fSHugo Mills __u64 rtransid; /* out */ 67abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 68abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 69abccd00fSHugo Mills __u64 flags; /* in */ 70abccd00fSHugo Mills __u64 reserved[16]; /* in */ 71abccd00fSHugo Mills } __attribute__ ((__packed__)); 72abccd00fSHugo Mills 73abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 74abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 75abccd00fSHugo Mills #endif 76abccd00fSHugo Mills 772351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 782351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 792351f431SJosef Bacik __s64 send_fd; /* in */ 802351f431SJosef Bacik __u64 clone_sources_count; /* in */ 812351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 822351f431SJosef Bacik __u64 parent_root; /* in */ 832351f431SJosef Bacik __u64 flags; /* in */ 842351f431SJosef Bacik __u64 reserved[4]; /* in */ 852351f431SJosef Bacik } __attribute__ ((__packed__)); 862351f431SJosef Bacik 872351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 882351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 892351f431SJosef Bacik #endif 90abccd00fSHugo Mills 916cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 921905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 931905a0f7SDavid Sterba unsigned int flags) 946cbff00fSChristoph Hellwig { 951905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 966cbff00fSChristoph Hellwig return flags; 971905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 986cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 996cbff00fSChristoph Hellwig else 1006cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1016cbff00fSChristoph Hellwig } 102f46b5a66SChristoph Hellwig 1036cbff00fSChristoph Hellwig /* 104a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 105a157d4fdSDavid Sterba * ioctl. 1066cbff00fSChristoph Hellwig */ 10777eea05eSBoris Burkov static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) 1086cbff00fSChristoph Hellwig { 1096cbff00fSChristoph Hellwig unsigned int iflags = 0; 11077eea05eSBoris Burkov u32 flags = binode->flags; 11114605409SBoris Burkov u32 ro_flags = binode->ro_flags; 1126cbff00fSChristoph Hellwig 1136cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1146cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1156cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1166cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1176cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1186cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1196cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1206cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1216cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1226cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1236cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1246cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 125d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 126d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 12714605409SBoris Burkov if (ro_flags & BTRFS_INODE_RO_VERITY) 12814605409SBoris Burkov iflags |= FS_VERITY_FL; 129d0092bddSLi Zefan 13013f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 131d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 13213f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 13313f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1346cbff00fSChristoph Hellwig 1356cbff00fSChristoph Hellwig return iflags; 1366cbff00fSChristoph Hellwig } 1376cbff00fSChristoph Hellwig 1386cbff00fSChristoph Hellwig /* 1396cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1406cbff00fSChristoph Hellwig */ 1417b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1426cbff00fSChristoph Hellwig { 1435c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1443cc79392SFilipe Manana unsigned int new_fl = 0; 1456cbff00fSChristoph Hellwig 1465c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1473cc79392SFilipe Manana new_fl |= S_SYNC; 1485c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1493cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1505c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1513cc79392SFilipe Manana new_fl |= S_APPEND; 1525c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1533cc79392SFilipe Manana new_fl |= S_NOATIME; 1545c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1553cc79392SFilipe Manana new_fl |= S_DIRSYNC; 15614605409SBoris Burkov if (binode->ro_flags & BTRFS_INODE_RO_VERITY) 15714605409SBoris Burkov new_fl |= S_VERITY; 1583cc79392SFilipe Manana 1593cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 16014605409SBoris Burkov S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | 16114605409SBoris Burkov S_VERITY, new_fl); 1626cbff00fSChristoph Hellwig } 1636cbff00fSChristoph Hellwig 164f37c563bSDavid Sterba /* 165f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 166f37c563bSDavid Sterba * the old and new flags are not conflicting 167f37c563bSDavid Sterba */ 168f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 16975e7cb7fSLiu Bo { 17075e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17175e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17275e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 173e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 174e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17575e7cb7fSLiu Bo return -EOPNOTSUPP; 17675e7cb7fSLiu Bo 177f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 17875e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 17975e7cb7fSLiu Bo return -EINVAL; 18075e7cb7fSLiu Bo 181f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 182f37c563bSDavid Sterba return -EINVAL; 183f37c563bSDavid Sterba 184f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 185f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 186f37c563bSDavid Sterba return -EINVAL; 187f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 188f37c563bSDavid Sterba return -EINVAL; 189f37c563bSDavid Sterba 19075e7cb7fSLiu Bo return 0; 19175e7cb7fSLiu Bo } 19275e7cb7fSLiu Bo 193d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 194d206e9c9SNaohiro Aota unsigned int flags) 195d206e9c9SNaohiro Aota { 196d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 197d206e9c9SNaohiro Aota return -EPERM; 198d206e9c9SNaohiro Aota 199d206e9c9SNaohiro Aota return 0; 200d206e9c9SNaohiro Aota } 201d206e9c9SNaohiro Aota 20297fc2977SMiklos Szeredi /* 20397fc2977SMiklos Szeredi * Set flags/xflags from the internal inode flags. The remaining items of 20497fc2977SMiklos Szeredi * fsxattr are zeroed. 20597fc2977SMiklos Szeredi */ 20697fc2977SMiklos Szeredi int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 2076cbff00fSChristoph Hellwig { 20897fc2977SMiklos Szeredi struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); 20997fc2977SMiklos Szeredi 21077eea05eSBoris Burkov fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); 21197fc2977SMiklos Szeredi return 0; 21297fc2977SMiklos Szeredi } 21397fc2977SMiklos Szeredi 21497fc2977SMiklos Szeredi int btrfs_fileattr_set(struct user_namespace *mnt_userns, 21597fc2977SMiklos Szeredi struct dentry *dentry, struct fileattr *fa) 21697fc2977SMiklos Szeredi { 21797fc2977SMiklos Szeredi struct inode *inode = d_inode(dentry); 2180b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2195c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2205c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2216cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2225aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2236cbff00fSChristoph Hellwig int ret; 224ff9fef55SAnand Jain const char *comp = NULL; 225f37c563bSDavid Sterba u32 binode_flags; 2266cbff00fSChristoph Hellwig 227b83cc969SLi Zefan if (btrfs_root_readonly(root)) 228b83cc969SLi Zefan return -EROFS; 229b83cc969SLi Zefan 23097fc2977SMiklos Szeredi if (fileattr_has_fsx(fa)) 23197fc2977SMiklos Szeredi return -EOPNOTSUPP; 2326cbff00fSChristoph Hellwig 23397fc2977SMiklos Szeredi fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); 23477eea05eSBoris Burkov old_fsflags = btrfs_inode_flags_to_fsflags(binode); 23597fc2977SMiklos Szeredi ret = check_fsflags(old_fsflags, fsflags); 236e7848683SJan Kara if (ret) 237e7848683SJan Kara return ret; 238e7848683SJan Kara 239d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 240d206e9c9SNaohiro Aota if (ret) 24197fc2977SMiklos Szeredi return ret; 242d206e9c9SNaohiro Aota 243f37c563bSDavid Sterba binode_flags = binode->flags; 2445c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 245d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2466cbff00fSChristoph Hellwig else 247d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2485c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 249d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2506cbff00fSChristoph Hellwig else 251d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2525c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 253d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2546cbff00fSChristoph Hellwig else 255d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2565c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 257d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2586cbff00fSChristoph Hellwig else 259d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2605c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 261d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2626cbff00fSChristoph Hellwig else 263d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 26497fc2977SMiklos Szeredi 26597fc2977SMiklos Szeredi /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ 26697fc2977SMiklos Szeredi if (!fa->flags_valid) { 26797fc2977SMiklos Szeredi /* 1 item for the inode */ 26897fc2977SMiklos Szeredi trans = btrfs_start_transaction(root, 1); 2699b8a233bSRitesh Harjani if (IS_ERR(trans)) 2709b8a233bSRitesh Harjani return PTR_ERR(trans); 27197fc2977SMiklos Szeredi goto update_flags; 27297fc2977SMiklos Szeredi } 27397fc2977SMiklos Szeredi 2745c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 275d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2766cbff00fSChristoph Hellwig else 277d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2785c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 27944e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2807e97b8daSDavid Sterba /* 2817e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2827e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2837e97b8daSDavid Sterba * status of the file and will not set it. 2847e97b8daSDavid Sterba */ 2857e97b8daSDavid Sterba if (inode->i_size == 0) 286d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 287d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2887e97b8daSDavid Sterba } else { 289d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2907e97b8daSDavid Sterba } 2917e97b8daSDavid Sterba } else { 2927e97b8daSDavid Sterba /* 29301327610SNicholas D Steeves * Revert back under same assumptions as above 2947e97b8daSDavid Sterba */ 29544e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2967e97b8daSDavid Sterba if (inode->i_size == 0) 297d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 298d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2997e97b8daSDavid Sterba } else { 300d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 3017e97b8daSDavid Sterba } 3027e97b8daSDavid Sterba } 3036cbff00fSChristoph Hellwig 30475e7cb7fSLiu Bo /* 30575e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 30675e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30775e7cb7fSLiu Bo * things smaller. 30875e7cb7fSLiu Bo */ 3095c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 310d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 311d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3125c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 31363541927SFilipe David Borba Manana 31497fc2977SMiklos Szeredi if (IS_SWAPFILE(inode)) 31597fc2977SMiklos Szeredi return -ETXTBSY; 316eede2bf3SOmar Sandoval 317d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 318d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 31963541927SFilipe David Borba Manana 32093370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 32193370509SDavid Sterba if (!comp || comp[0] == 0) 32293370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 323ebcb904dSLi Zefan } else { 324d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 32575e7cb7fSLiu Bo } 3266cbff00fSChristoph Hellwig 327ff9fef55SAnand Jain /* 328ff9fef55SAnand Jain * 1 for inode item 329ff9fef55SAnand Jain * 2 for properties 330ff9fef55SAnand Jain */ 331ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 33297fc2977SMiklos Szeredi if (IS_ERR(trans)) 33397fc2977SMiklos Szeredi return PTR_ERR(trans); 3346cbff00fSChristoph Hellwig 335ff9fef55SAnand Jain if (comp) { 336ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 337ff9fef55SAnand Jain strlen(comp), 0); 338ff9fef55SAnand Jain if (ret) { 339ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 340ff9fef55SAnand Jain goto out_end_trans; 341ff9fef55SAnand Jain } 342ff9fef55SAnand Jain } else { 343ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 344ff9fef55SAnand Jain 0, 0); 345ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 346ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 347ff9fef55SAnand Jain goto out_end_trans; 348ff9fef55SAnand Jain } 349ff9fef55SAnand Jain } 350ff9fef55SAnand Jain 35197fc2977SMiklos Szeredi update_flags: 352d2b8fcfeSAnand Jain binode->flags = binode_flags; 3537b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3540c4d2d95SJosef Bacik inode_inc_iversion(inode); 355c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3569a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3576cbff00fSChristoph Hellwig 358ff9fef55SAnand Jain out_end_trans: 3593a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3602d4e6f6aSliubo return ret; 3616cbff00fSChristoph Hellwig } 3626cbff00fSChristoph Hellwig 3630d7ed32cSDavid Sterba /* 3640d7ed32cSDavid Sterba * Start exclusive operation @type, return true on success 3650d7ed32cSDavid Sterba */ 366c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 367c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 368c3e1f96cSGoldwyn Rodrigues { 3690d7ed32cSDavid Sterba bool ret = false; 3700d7ed32cSDavid Sterba 3710d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 3720d7ed32cSDavid Sterba if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { 3730d7ed32cSDavid Sterba fs_info->exclusive_operation = type; 3740d7ed32cSDavid Sterba ret = true; 3750d7ed32cSDavid Sterba } 3760d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 3770d7ed32cSDavid Sterba 3780d7ed32cSDavid Sterba return ret; 379c3e1f96cSGoldwyn Rodrigues } 380c3e1f96cSGoldwyn Rodrigues 381578bda9eSDavid Sterba /* 382578bda9eSDavid Sterba * Conditionally allow to enter the exclusive operation in case it's compatible 383578bda9eSDavid Sterba * with the running one. This must be paired with btrfs_exclop_start_unlock and 384578bda9eSDavid Sterba * btrfs_exclop_finish. 385578bda9eSDavid Sterba * 386578bda9eSDavid Sterba * Compatibility: 387578bda9eSDavid Sterba * - the same type is already running 388578bda9eSDavid Sterba * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller 389578bda9eSDavid Sterba * must check the condition first that would allow none -> @type 390578bda9eSDavid Sterba */ 391578bda9eSDavid Sterba bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, 392578bda9eSDavid Sterba enum btrfs_exclusive_operation type) 393578bda9eSDavid Sterba { 394578bda9eSDavid Sterba spin_lock(&fs_info->super_lock); 395578bda9eSDavid Sterba if (fs_info->exclusive_operation == type) 396578bda9eSDavid Sterba return true; 397578bda9eSDavid Sterba 398578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 399578bda9eSDavid Sterba return false; 400578bda9eSDavid Sterba } 401578bda9eSDavid Sterba 402578bda9eSDavid Sterba void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) 403578bda9eSDavid Sterba { 404578bda9eSDavid Sterba spin_unlock(&fs_info->super_lock); 405578bda9eSDavid Sterba } 406578bda9eSDavid Sterba 407c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 408c3e1f96cSGoldwyn Rodrigues { 4090d7ed32cSDavid Sterba spin_lock(&fs_info->super_lock); 410c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 4110d7ed32cSDavid Sterba spin_unlock(&fs_info->super_lock); 41266a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 413c3e1f96cSGoldwyn Rodrigues } 414c3e1f96cSGoldwyn Rodrigues 4156cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 4166cbff00fSChristoph Hellwig { 417496ad9aaSAl Viro struct inode *inode = file_inode(file); 4186cbff00fSChristoph Hellwig 4196cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 4206cbff00fSChristoph Hellwig } 421f46b5a66SChristoph Hellwig 422b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 423b929c1d8SMarcos Paulo de Souza void __user *arg) 424f7039b1dSLi Dongyang { 425f7039b1dSLi Dongyang struct btrfs_device *device; 426f7039b1dSLi Dongyang struct request_queue *q; 427f7039b1dSLi Dongyang struct fstrim_range range; 428f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 429f7039b1dSLi Dongyang u64 num_devices = 0; 430f7039b1dSLi Dongyang int ret; 431f7039b1dSLi Dongyang 432f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 433f7039b1dSLi Dongyang return -EPERM; 434f7039b1dSLi Dongyang 435f35f06c3SFilipe Manana /* 4361cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 4371cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 4381cb3dc3fSNaohiro Aota * filesystem for now. 4391cb3dc3fSNaohiro Aota */ 4401cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 4411cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 4421cb3dc3fSNaohiro Aota 4431cb3dc3fSNaohiro Aota /* 444f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 445f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 446f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 447f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 448f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 449f35f06c3SFilipe Manana */ 450f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 451f35f06c3SFilipe Manana return -EROFS; 452f35f06c3SFilipe Manana 4531f78160cSXiao Guangrong rcu_read_lock(); 4541f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 4551f78160cSXiao Guangrong dev_list) { 456f7039b1dSLi Dongyang if (!device->bdev) 457f7039b1dSLi Dongyang continue; 458f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 459f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 460f7039b1dSLi Dongyang num_devices++; 46150d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 462f7039b1dSLi Dongyang minlen); 463f7039b1dSLi Dongyang } 464f7039b1dSLi Dongyang } 4651f78160cSXiao Guangrong rcu_read_unlock(); 466f4c697e6SLukas Czerner 467f7039b1dSLi Dongyang if (!num_devices) 468f7039b1dSLi Dongyang return -EOPNOTSUPP; 469f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 470f7039b1dSLi Dongyang return -EFAULT; 4716ba9fc8eSQu Wenruo 4726ba9fc8eSQu Wenruo /* 4736ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 4746ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 4756ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 4766ba9fc8eSQu Wenruo */ 4776ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 478f4c697e6SLukas Czerner return -EINVAL; 479f7039b1dSLi Dongyang 480f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 4812ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 482f7039b1dSLi Dongyang if (ret < 0) 483f7039b1dSLi Dongyang return ret; 484f7039b1dSLi Dongyang 485f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 486f7039b1dSLi Dongyang return -EFAULT; 487f7039b1dSLi Dongyang 488f7039b1dSLi Dongyang return 0; 489f7039b1dSLi Dongyang } 490f7039b1dSLi Dongyang 491e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 492dd5f9615SStefan Behrens { 49346e0f66aSChris Mason int i; 49446e0f66aSChris Mason 49546e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 49646e0f66aSChris Mason if (uuid[i]) 49746e0f66aSChris Mason return 0; 49846e0f66aSChris Mason } 49946e0f66aSChris Mason return 1; 500dd5f9615SStefan Behrens } 501dd5f9615SStefan Behrens 5024d4340c9SChristian Brauner static noinline int create_subvol(struct user_namespace *mnt_userns, 5034d4340c9SChristian Brauner struct inode *dir, struct dentry *dentry, 50452f75f4fSDavid Sterba const char *name, int namelen, 5058696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 506f46b5a66SChristoph Hellwig { 5070b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 508f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 509f46b5a66SChristoph Hellwig struct btrfs_key key; 51049a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 511f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 512f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 513d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 51476dda93cSYan, Zheng struct btrfs_root *new_root; 515d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 51695582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 5175662344bSTsutomu Itoh struct inode *inode; 518f46b5a66SChristoph Hellwig int ret; 519f46b5a66SChristoph Hellwig int err; 5202dfb1e43SQu Wenruo dev_t anon_dev = 0; 521f46b5a66SChristoph Hellwig u64 objectid; 5223de4586cSChris Mason u64 index = 0; 523f46b5a66SChristoph Hellwig 52449a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 52549a3c4d9SDavid Sterba if (!root_item) 52649a3c4d9SDavid Sterba return -ENOMEM; 52749a3c4d9SDavid Sterba 528543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 5292fbe8c8aSAl Viro if (ret) 53049a3c4d9SDavid Sterba goto fail_free; 5316a912213SJosef Bacik 5322dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 5332dfb1e43SQu Wenruo if (ret < 0) 5342dfb1e43SQu Wenruo goto fail_free; 5352dfb1e43SQu Wenruo 536e09fe2d2SQu Wenruo /* 537e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 53801327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 539e09fe2d2SQu Wenruo */ 54049a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 54149a3c4d9SDavid Sterba ret = -ENOSPC; 54249a3c4d9SDavid Sterba goto fail_free; 54349a3c4d9SDavid Sterba } 544e09fe2d2SQu Wenruo 545d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 5469ed74f2dSJosef Bacik /* 547d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 548d5c12070SMiao Xie * of create_snapshot(). 5499ed74f2dSJosef Bacik */ 550c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 551d5c12070SMiao Xie if (ret) 55249a3c4d9SDavid Sterba goto fail_free; 553f46b5a66SChristoph Hellwig 554d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 555d5c12070SMiao Xie if (IS_ERR(trans)) { 556d5c12070SMiao Xie ret = PTR_ERR(trans); 557e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 55849a3c4d9SDavid Sterba goto fail_free; 559d5c12070SMiao Xie } 560d5c12070SMiao Xie trans->block_rsv = &block_rsv; 561d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 562f46b5a66SChristoph Hellwig 563a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 5646f72c7e2SArne Jansen if (ret) 5656f72c7e2SArne Jansen goto fail; 5666f72c7e2SArne Jansen 5679631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 5689631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 5698e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 5708e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 5718e8a1e31SJosef Bacik goto fail; 5728e8a1e31SJosef Bacik } 573f46b5a66SChristoph Hellwig 574f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 575f46b5a66SChristoph Hellwig 57649a3c4d9SDavid Sterba inode_item = &root_item->inode; 5773cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 5783cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 5793cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 580da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 5810b246afaSJeff Mahoney fs_info->nodesize); 5823cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 583f46b5a66SChristoph Hellwig 58449a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 58549a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 5863cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 58708fe4db1SLi Zefan 58849a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 58949a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 59049a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 59149a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 59249a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 59349a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 594f46b5a66SChristoph Hellwig 59549a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 59649a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 597807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 59849a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 59949a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 60049a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 60149a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 60249a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 603f46b5a66SChristoph Hellwig 604925baeddSChris Mason btrfs_tree_unlock(leaf); 605f46b5a66SChristoph Hellwig 60669948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 607f46b5a66SChristoph Hellwig 608f46b5a66SChristoph Hellwig key.objectid = objectid; 6095d4f98a2SYan Zheng key.offset = 0; 610962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 6110b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 61249a3c4d9SDavid Sterba root_item); 61367addf29SFilipe Manana if (ret) { 61467addf29SFilipe Manana /* 61567addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 61667addf29SFilipe Manana * tree block so that we don't leak space and leave the 61767addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 61867addf29SFilipe Manana * extent tree without backreferences). Also no need to have 61967addf29SFilipe Manana * the tree block locked since it is not in any tree at this 62067addf29SFilipe Manana * point, so no other task can find it and use it. 62167addf29SFilipe Manana */ 62267addf29SFilipe Manana btrfs_free_tree_block(trans, root, leaf, 0, 1); 62367addf29SFilipe Manana free_extent_buffer(leaf); 624f46b5a66SChristoph Hellwig goto fail; 62567addf29SFilipe Manana } 62667addf29SFilipe Manana 62767addf29SFilipe Manana free_extent_buffer(leaf); 62867addf29SFilipe Manana leaf = NULL; 629f46b5a66SChristoph Hellwig 63076dda93cSYan, Zheng key.offset = (u64)-1; 6312dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 63279787eaaSJeff Mahoney if (IS_ERR(new_root)) { 6332dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 63479787eaaSJeff Mahoney ret = PTR_ERR(new_root); 63566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 63679787eaaSJeff Mahoney goto fail; 63779787eaaSJeff Mahoney } 6382dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 6392dfb1e43SQu Wenruo anon_dev = 0; 64076dda93cSYan, Zheng 641221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 642221581e4SJosef Bacik if (ret) { 643221581e4SJosef Bacik btrfs_put_root(new_root); 644221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 645221581e4SJosef Bacik goto fail; 646221581e4SJosef Bacik } 64776dda93cSYan, Zheng 6484d4340c9SChristian Brauner ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns); 64900246528SJosef Bacik btrfs_put_root(new_root); 650ce598979SMark Fasheh if (ret) { 651ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 65266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 653ce598979SMark Fasheh goto fail; 654ce598979SMark Fasheh } 655ce598979SMark Fasheh 656f46b5a66SChristoph Hellwig /* 657f46b5a66SChristoph Hellwig * insert the directory item 658f46b5a66SChristoph Hellwig */ 659877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 66079787eaaSJeff Mahoney if (ret) { 66166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 66279787eaaSJeff Mahoney goto fail; 66379787eaaSJeff Mahoney } 6643de4586cSChris Mason 665684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 6663de4586cSChris Mason BTRFS_FT_DIR, index); 66779787eaaSJeff Mahoney if (ret) { 66866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 669f46b5a66SChristoph Hellwig goto fail; 67079787eaaSJeff Mahoney } 6710660b5afSChris Mason 6726ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 6739a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 674c7e54b51SJosef Bacik if (ret) { 675c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 676c7e54b51SJosef Bacik goto fail; 677c7e54b51SJosef Bacik } 67852c26179SYan Zheng 6796025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 6804a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 681c7e54b51SJosef Bacik if (ret) { 682c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 683c7e54b51SJosef Bacik goto fail; 684c7e54b51SJosef Bacik } 6850660b5afSChris Mason 686cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 6876bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 688dd5f9615SStefan Behrens if (ret) 68966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 690dd5f9615SStefan Behrens 691f46b5a66SChristoph Hellwig fail: 69249a3c4d9SDavid Sterba kfree(root_item); 693d5c12070SMiao Xie trans->block_rsv = NULL; 694d5c12070SMiao Xie trans->bytes_reserved = 0; 695e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 696de6e8200SLiu Bo 6973a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 698f46b5a66SChristoph Hellwig if (err && !ret) 699f46b5a66SChristoph Hellwig ret = err; 7001a65e24bSChris Mason 7015662344bSTsutomu Itoh if (!ret) { 7025662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 703de6e8200SLiu Bo if (IS_ERR(inode)) 704de6e8200SLiu Bo return PTR_ERR(inode); 7055662344bSTsutomu Itoh d_instantiate(dentry, inode); 7065662344bSTsutomu Itoh } 707f46b5a66SChristoph Hellwig return ret; 70849a3c4d9SDavid Sterba 70949a3c4d9SDavid Sterba fail_free: 7102dfb1e43SQu Wenruo if (anon_dev) 7112dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 71249a3c4d9SDavid Sterba kfree(root_item); 71349a3c4d9SDavid Sterba return ret; 714f46b5a66SChristoph Hellwig } 715f46b5a66SChristoph Hellwig 716e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7179babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 718e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 719f46b5a66SChristoph Hellwig { 7200b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7212e4bfab9SYan, Zheng struct inode *inode; 722f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 723f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7242e4bfab9SYan, Zheng int ret; 725f46b5a66SChristoph Hellwig 72692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 727f46b5a66SChristoph Hellwig return -EINVAL; 728f46b5a66SChristoph Hellwig 729eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 730eede2bf3SOmar Sandoval btrfs_warn(fs_info, 731eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 732eede2bf3SOmar Sandoval return -ETXTBSY; 733eede2bf3SOmar Sandoval } 734eede2bf3SOmar Sandoval 73523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 736a1ee7362SDavid Sterba if (!pending_snapshot) 737a1ee7362SDavid Sterba return -ENOMEM; 738a1ee7362SDavid Sterba 7392dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 7402dfb1e43SQu Wenruo if (ret < 0) 7412dfb1e43SQu Wenruo goto free_pending; 742b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 74323269bf5SDavid Sterba GFP_KERNEL); 7448546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 7458546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 746b0c0ea63SDavid Sterba ret = -ENOMEM; 747b0c0ea63SDavid Sterba goto free_pending; 748b0c0ea63SDavid Sterba } 749b0c0ea63SDavid Sterba 75066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 75166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 752d5c12070SMiao Xie /* 753d5c12070SMiao Xie * 1 - parent dir inode 754d5c12070SMiao Xie * 2 - dir entries 755d5c12070SMiao Xie * 1 - root item 756d5c12070SMiao Xie * 2 - root ref/backref 757d5c12070SMiao Xie * 1 - root of snapshot 758dd5f9615SStefan Behrens * 1 - UUID item 759d5c12070SMiao Xie */ 760d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 761dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 762ee3441b4SJeff Mahoney false); 763d5c12070SMiao Xie if (ret) 764c11fbb6eSRobbie Ko goto free_pending; 765d5c12070SMiao Xie 766a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 767a22285a6SYan, Zheng pending_snapshot->root = root; 768b83cc969SLi Zefan pending_snapshot->readonly = readonly; 769e9662f70SMiao Xie pending_snapshot->dir = dir; 7708696c533SMiao Xie pending_snapshot->inherit = inherit; 771a22285a6SYan, Zheng 772d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 773a22285a6SYan, Zheng if (IS_ERR(trans)) { 774a22285a6SYan, Zheng ret = PTR_ERR(trans); 775a22285a6SYan, Zheng goto fail; 776a22285a6SYan, Zheng } 777a22285a6SYan, Zheng 7780b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 779a22285a6SYan, Zheng list_add(&pending_snapshot->list, 780a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 7810b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 7829babda9fSNikolay Borisov 7833a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 784aec8030aSMiao Xie if (ret) 785c37b2b62SJosef Bacik goto fail; 786a22285a6SYan, Zheng 787a22285a6SYan, Zheng ret = pending_snapshot->error; 788f46b5a66SChristoph Hellwig if (ret) 7892e4bfab9SYan, Zheng goto fail; 790f46b5a66SChristoph Hellwig 791d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 792d3797308SChris Mason if (ret) 793d3797308SChris Mason goto fail; 794d3797308SChris Mason 7952b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 7962e4bfab9SYan, Zheng if (IS_ERR(inode)) { 7972e4bfab9SYan, Zheng ret = PTR_ERR(inode); 7982e4bfab9SYan, Zheng goto fail; 7992e4bfab9SYan, Zheng } 8005662344bSTsutomu Itoh 8012e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8022e4bfab9SYan, Zheng ret = 0; 8032dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8042e4bfab9SYan, Zheng fail: 8052dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8062dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8072dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 80800246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 809e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 810b0c0ea63SDavid Sterba free_pending: 8112dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8122dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 813b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8148546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 815a1ee7362SDavid Sterba kfree(pending_snapshot); 816a1ee7362SDavid Sterba 817f46b5a66SChristoph Hellwig return ret; 818f46b5a66SChristoph Hellwig } 819f46b5a66SChristoph Hellwig 8204260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8214260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8224260f7c7SSage Weil * whether the type of victim is right. 8234260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8244260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8254260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8264260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8274260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8284260f7c7SSage Weil * a. be owner of dir, or 8294260f7c7SSage Weil * b. be owner of victim, or 8304260f7c7SSage Weil * c. have CAP_FOWNER capability 83101327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 8324260f7c7SSage Weil * links pointing to it. 8334260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 8344260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 8354260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 8364260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 8374260f7c7SSage Weil * nfs_async_unlink(). 8384260f7c7SSage Weil */ 8394260f7c7SSage Weil 840c4ed533bSChristian Brauner static int btrfs_may_delete(struct user_namespace *mnt_userns, 841c4ed533bSChristian Brauner struct inode *dir, struct dentry *victim, int isdir) 8424260f7c7SSage Weil { 8434260f7c7SSage Weil int error; 8444260f7c7SSage Weil 8452b0143b5SDavid Howells if (d_really_is_negative(victim)) 8464260f7c7SSage Weil return -ENOENT; 8474260f7c7SSage Weil 8482b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 8494fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 8504260f7c7SSage Weil 851c4ed533bSChristian Brauner error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 8524260f7c7SSage Weil if (error) 8534260f7c7SSage Weil return error; 8544260f7c7SSage Weil if (IS_APPEND(dir)) 8554260f7c7SSage Weil return -EPERM; 856c4ed533bSChristian Brauner if (check_sticky(mnt_userns, dir, d_inode(victim)) || 857ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 858ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 8594260f7c7SSage Weil return -EPERM; 8604260f7c7SSage Weil if (isdir) { 861e36cb0b8SDavid Howells if (!d_is_dir(victim)) 8624260f7c7SSage Weil return -ENOTDIR; 8634260f7c7SSage Weil if (IS_ROOT(victim)) 8644260f7c7SSage Weil return -EBUSY; 865e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 8664260f7c7SSage Weil return -EISDIR; 8674260f7c7SSage Weil if (IS_DEADDIR(dir)) 8684260f7c7SSage Weil return -ENOENT; 8694260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 8704260f7c7SSage Weil return -EBUSY; 8714260f7c7SSage Weil return 0; 8724260f7c7SSage Weil } 8734260f7c7SSage Weil 874cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 8754d4340c9SChristian Brauner static inline int btrfs_may_create(struct user_namespace *mnt_userns, 8764d4340c9SChristian Brauner struct inode *dir, struct dentry *child) 877cb8e7090SChristoph Hellwig { 8782b0143b5SDavid Howells if (d_really_is_positive(child)) 879cb8e7090SChristoph Hellwig return -EEXIST; 880cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 881cb8e7090SChristoph Hellwig return -ENOENT; 8824d4340c9SChristian Brauner if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) 8835474bf40SChristian Brauner return -EOVERFLOW; 8844d4340c9SChristian Brauner return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); 885cb8e7090SChristoph Hellwig } 886cb8e7090SChristoph Hellwig 887cb8e7090SChristoph Hellwig /* 888cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 889cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 890cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 891cb8e7090SChristoph Hellwig */ 89292872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 8934d4340c9SChristian Brauner struct user_namespace *mnt_userns, 89452f75f4fSDavid Sterba const char *name, int namelen, 89572fd032eSSage Weil struct btrfs_root *snap_src, 8969babda9fSNikolay Borisov bool readonly, 8978696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 898cb8e7090SChristoph Hellwig { 8992b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 901cb8e7090SChristoph Hellwig struct dentry *dentry; 902cb8e7090SChristoph Hellwig int error; 903cb8e7090SChristoph Hellwig 90400235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 90500235411SAl Viro if (error == -EINTR) 90600235411SAl Viro return error; 907cb8e7090SChristoph Hellwig 9084d4340c9SChristian Brauner dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); 909cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 910cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 911cb8e7090SChristoph Hellwig goto out_unlock; 912cb8e7090SChristoph Hellwig 9134d4340c9SChristian Brauner error = btrfs_may_create(mnt_userns, dir, dentry); 914cb8e7090SChristoph Hellwig if (error) 915a874a63eSLiu Bo goto out_dput; 916cb8e7090SChristoph Hellwig 9179c52057cSChris Mason /* 9189c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9199c52057cSChris Mason * check for them now when we can safely fail 9209c52057cSChris Mason */ 9219c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9229c52057cSChris Mason dir->i_ino, name, 9239c52057cSChris Mason namelen); 9249c52057cSChris Mason if (error) 9259c52057cSChris Mason goto out_dput; 9269c52057cSChris Mason 9270b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 92876dda93cSYan, Zheng 92976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 93076dda93cSYan, Zheng goto out_up_read; 93176dda93cSYan, Zheng 9329babda9fSNikolay Borisov if (snap_src) 9339babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9349babda9fSNikolay Borisov else 9354d4340c9SChristian Brauner error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit); 9369babda9fSNikolay Borisov 93776dda93cSYan, Zheng if (!error) 93876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 93976dda93cSYan, Zheng out_up_read: 9400b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 941cb8e7090SChristoph Hellwig out_dput: 942cb8e7090SChristoph Hellwig dput(dentry); 943cb8e7090SChristoph Hellwig out_unlock: 94464708539SJosef Bacik btrfs_inode_unlock(dir, 0); 945cb8e7090SChristoph Hellwig return error; 946cb8e7090SChristoph Hellwig } 947cb8e7090SChristoph Hellwig 948c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 9494d4340c9SChristian Brauner struct user_namespace *mnt_userns, 950c11fbb6eSRobbie Ko const char *name, int namelen, 951c11fbb6eSRobbie Ko struct btrfs_root *root, 952c11fbb6eSRobbie Ko bool readonly, 953c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 954c11fbb6eSRobbie Ko { 955c11fbb6eSRobbie Ko int ret; 956c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 957c11fbb6eSRobbie Ko 958c11fbb6eSRobbie Ko /* 959c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 960c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 961c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 962c11fbb6eSRobbie Ko */ 963c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 964c11fbb6eSRobbie Ko 965f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 966c11fbb6eSRobbie Ko if (ret) 967c11fbb6eSRobbie Ko goto out; 968c11fbb6eSRobbie Ko 969c11fbb6eSRobbie Ko /* 970c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 971c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 972c11fbb6eSRobbie Ko * creation. 973c11fbb6eSRobbie Ko */ 974c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 975c11fbb6eSRobbie Ko snapshot_force_cow = true; 976c11fbb6eSRobbie Ko 977c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 978c11fbb6eSRobbie Ko 9794d4340c9SChristian Brauner ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, 980c11fbb6eSRobbie Ko root, readonly, inherit); 981c11fbb6eSRobbie Ko out: 982c11fbb6eSRobbie Ko if (snapshot_force_cow) 983c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 984c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 985c11fbb6eSRobbie Ko return ret; 986c11fbb6eSRobbie Ko } 987c11fbb6eSRobbie Ko 9884cb5300bSChris Mason /* 9894cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 9904cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 9914cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 9924cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 9934cb5300bSChris Mason * part of the file 9944cb5300bSChris Mason */ 995aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 9964cb5300bSChris Mason { 9974cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 9984cb5300bSChris Mason struct extent_map *em = NULL; 9994cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10004cb5300bSChris Mason u64 end; 10014cb5300bSChris Mason 10024cb5300bSChris Mason read_lock(&em_tree->lock); 100309cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10044cb5300bSChris Mason read_unlock(&em_tree->lock); 10054cb5300bSChris Mason 10064cb5300bSChris Mason if (em) { 10074cb5300bSChris Mason end = extent_map_end(em); 10084cb5300bSChris Mason free_extent_map(em); 10094cb5300bSChris Mason if (end - offset > thresh) 10104cb5300bSChris Mason return 0; 10114cb5300bSChris Mason } 10124cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10134cb5300bSChris Mason thresh /= 2; 10144cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10154cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10164cb5300bSChris Mason if (end >= thresh) 10174cb5300bSChris Mason return 0; 10184cb5300bSChris Mason return 1; 10194cb5300bSChris Mason } 10204cb5300bSChris Mason 10214cb5300bSChris Mason /* 10224cb5300bSChris Mason * helper function to walk through a file and find extents 10234cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10244cb5300bSChris Mason * 10254cb5300bSChris Mason * This is used by the defragging code to find new and small 10264cb5300bSChris Mason * extents 10274cb5300bSChris Mason */ 10284cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10294cb5300bSChris Mason struct inode *inode, u64 newer_than, 1030aab110abSDavid Sterba u64 *off, u32 thresh) 10314cb5300bSChris Mason { 10324cb5300bSChris Mason struct btrfs_path *path; 10334cb5300bSChris Mason struct btrfs_key min_key; 10344cb5300bSChris Mason struct extent_buffer *leaf; 10354cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10364cb5300bSChris Mason int type; 10374cb5300bSChris Mason int ret; 10384a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10394cb5300bSChris Mason 10404cb5300bSChris Mason path = btrfs_alloc_path(); 10414cb5300bSChris Mason if (!path) 10424cb5300bSChris Mason return -ENOMEM; 10434cb5300bSChris Mason 1044a4689d2bSDavid Sterba min_key.objectid = ino; 10454cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10464cb5300bSChris Mason min_key.offset = *off; 10474cb5300bSChris Mason 10484cb5300bSChris Mason while (1) { 10496174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10504cb5300bSChris Mason if (ret != 0) 10514cb5300bSChris Mason goto none; 1052f094c9bdSFilipe Manana process_slot: 1053a4689d2bSDavid Sterba if (min_key.objectid != ino) 10544cb5300bSChris Mason goto none; 10554cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10564cb5300bSChris Mason goto none; 10574cb5300bSChris Mason 10584cb5300bSChris Mason leaf = path->nodes[0]; 10594cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10604cb5300bSChris Mason struct btrfs_file_extent_item); 10614cb5300bSChris Mason 10624cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10634cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10644cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10654cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10664cb5300bSChris Mason *off = min_key.offset; 10674cb5300bSChris Mason btrfs_free_path(path); 10684cb5300bSChris Mason return 0; 10694cb5300bSChris Mason } 10704cb5300bSChris Mason 1071f094c9bdSFilipe Manana path->slots[0]++; 1072f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1073f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1074f094c9bdSFilipe Manana goto process_slot; 1075f094c9bdSFilipe Manana } 1076f094c9bdSFilipe Manana 10774cb5300bSChris Mason if (min_key.offset == (u64)-1) 10784cb5300bSChris Mason goto none; 10794cb5300bSChris Mason 10804cb5300bSChris Mason min_key.offset++; 10814cb5300bSChris Mason btrfs_release_path(path); 10824cb5300bSChris Mason } 10834cb5300bSChris Mason none: 10844cb5300bSChris Mason btrfs_free_path(path); 10854cb5300bSChris Mason return -ENOENT; 10864cb5300bSChris Mason } 10874cb5300bSChris Mason 10886c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 108917ce6ef8SLiu Bo { 109017ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1091940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10926c282eb4SLi Zefan struct extent_map *em; 109309cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1094940100a4SChris Mason 1095940100a4SChris Mason /* 1096940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1097940100a4SChris Mason * the full extent lock 1098940100a4SChris Mason */ 1099940100a4SChris Mason read_lock(&em_tree->lock); 1100940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1101940100a4SChris Mason read_unlock(&em_tree->lock); 1102940100a4SChris Mason 1103940100a4SChris Mason if (!em) { 1104308d9800SFilipe Manana struct extent_state *cached = NULL; 1105308d9800SFilipe Manana u64 end = start + len - 1; 1106308d9800SFilipe Manana 1107940100a4SChris Mason /* get the big lock and read metadata off disk */ 1108ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 110939b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1110e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1111940100a4SChris Mason 11126cf8bfbfSDan Carpenter if (IS_ERR(em)) 11136c282eb4SLi Zefan return NULL; 1114940100a4SChris Mason } 1115940100a4SChris Mason 11166c282eb4SLi Zefan return em; 11176c282eb4SLi Zefan } 11186c282eb4SLi Zefan 11196c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11206c282eb4SLi Zefan { 11216c282eb4SLi Zefan struct extent_map *next; 11226c282eb4SLi Zefan bool ret = true; 11236c282eb4SLi Zefan 11246c282eb4SLi Zefan /* this is the last extent */ 11256c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11266c282eb4SLi Zefan return false; 11276c282eb4SLi Zefan 11286c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1129e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1130e9512d72SChris Mason ret = false; 1131e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1132ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11336c282eb4SLi Zefan ret = false; 11346c282eb4SLi Zefan 11356c282eb4SLi Zefan free_extent_map(next); 11366c282eb4SLi Zefan return ret; 11376c282eb4SLi Zefan } 11386c282eb4SLi Zefan 1139aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1140a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1141a43a2111SAndrew Mahone int compress) 11426c282eb4SLi Zefan { 11436c282eb4SLi Zefan struct extent_map *em; 11446c282eb4SLi Zefan int ret = 1; 11456c282eb4SLi Zefan bool next_mergeable = true; 11464a3560c4SLiu Bo bool prev_mergeable = true; 11476c282eb4SLi Zefan 11486c282eb4SLi Zefan /* 11496c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11506c282eb4SLi Zefan * defragging it 11516c282eb4SLi Zefan */ 11526c282eb4SLi Zefan if (start < *defrag_end) 11536c282eb4SLi Zefan return 1; 11546c282eb4SLi Zefan 11556c282eb4SLi Zefan *skip = 0; 11566c282eb4SLi Zefan 11576c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11586c282eb4SLi Zefan if (!em) 11596c282eb4SLi Zefan return 0; 11606c282eb4SLi Zefan 1161940100a4SChris Mason /* this will cover holes, and inline extents */ 116217ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1163940100a4SChris Mason ret = 0; 116417ce6ef8SLiu Bo goto out; 116517ce6ef8SLiu Bo } 116617ce6ef8SLiu Bo 11674a3560c4SLiu Bo if (!*defrag_end) 11684a3560c4SLiu Bo prev_mergeable = false; 11694a3560c4SLiu Bo 11706c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1171940100a4SChris Mason /* 11726c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11736c282eb4SLi Zefan * real extent, don't bother defragging it 1174940100a4SChris Mason */ 1175a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11764a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1177940100a4SChris Mason ret = 0; 117817ce6ef8SLiu Bo out: 1179940100a4SChris Mason /* 1180940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1181940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1182940100a4SChris Mason * so that the next tiny extent will force a defrag. 1183940100a4SChris Mason * 1184940100a4SChris Mason * The end result of this is that tiny extents before a single big 1185940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1186940100a4SChris Mason */ 1187940100a4SChris Mason if (ret) { 1188940100a4SChris Mason *defrag_end = extent_map_end(em); 1189940100a4SChris Mason } else { 1190940100a4SChris Mason *last_len = 0; 1191940100a4SChris Mason *skip = extent_map_end(em); 1192940100a4SChris Mason *defrag_end = 0; 1193940100a4SChris Mason } 1194940100a4SChris Mason 1195940100a4SChris Mason free_extent_map(em); 1196940100a4SChris Mason return ret; 1197940100a4SChris Mason } 1198940100a4SChris Mason 11994cb5300bSChris Mason /* 12004cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12014cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12024cb5300bSChris Mason * to COW and defrag. 12034cb5300bSChris Mason * 12044cb5300bSChris Mason * It also makes sure the delalloc code has enough 12054cb5300bSChris Mason * dirty data to avoid making new small extents as part 12064cb5300bSChris Mason * of the defrag 12074cb5300bSChris Mason * 12084cb5300bSChris Mason * It's a good idea to start RA on this range 12094cb5300bSChris Mason * before calling this. 12104cb5300bSChris Mason */ 12114cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12124cb5300bSChris Mason struct page **pages, 12134cb5300bSChris Mason unsigned long start_index, 1214c41570c9SJustin Maggard unsigned long num_pages) 1215f46b5a66SChristoph Hellwig { 12164cb5300bSChris Mason unsigned long file_end; 12174cb5300bSChris Mason u64 isize = i_size_read(inode); 1218f46b5a66SChristoph Hellwig u64 page_start; 1219f46b5a66SChristoph Hellwig u64 page_end; 12201f12bd06SLiu Bo u64 page_cnt; 1221a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 12227f458a38SFilipe Manana u64 search_start; 12234cb5300bSChris Mason int ret; 12244cb5300bSChris Mason int i; 12254cb5300bSChris Mason int i_done; 12264cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12274cb5300bSChris Mason struct extent_state *cached_state = NULL; 1228600a45e1SMiao Xie struct extent_io_tree *tree; 1229364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12303b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12314cb5300bSChris Mason 123209cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12331f12bd06SLiu Bo if (!isize || start_index > file_end) 12341f12bd06SLiu Bo return 0; 12351f12bd06SLiu Bo 12361f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 12374cb5300bSChris Mason 1238e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1239a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 12404cb5300bSChris Mason if (ret) 12414cb5300bSChris Mason return ret; 12424cb5300bSChris Mason i_done = 0; 1243600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 12444cb5300bSChris Mason 12454cb5300bSChris Mason /* step one, lock all the pages */ 12461f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 12474cb5300bSChris Mason struct page *page; 1248600a45e1SMiao Xie again: 1249a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 12503b16a4e3SJosef Bacik start_index + i, mask); 12514cb5300bSChris Mason if (!page) 12524cb5300bSChris Mason break; 12534cb5300bSChris Mason 125432443de3SQu Wenruo ret = set_page_extent_mapped(page); 125532443de3SQu Wenruo if (ret < 0) { 125632443de3SQu Wenruo unlock_page(page); 125732443de3SQu Wenruo put_page(page); 125832443de3SQu Wenruo break; 125932443de3SQu Wenruo } 126032443de3SQu Wenruo 1261600a45e1SMiao Xie page_start = page_offset(page); 126209cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1263600a45e1SMiao Xie while (1) { 1264308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1265ff13db41SDavid Sterba &cached_state); 1266c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1267600a45e1SMiao Xie page_start); 1268308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1269e43bbe5eSDavid Sterba &cached_state); 1270600a45e1SMiao Xie if (!ordered) 1271600a45e1SMiao Xie break; 1272600a45e1SMiao Xie 1273600a45e1SMiao Xie unlock_page(page); 1274c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1275600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1276600a45e1SMiao Xie lock_page(page); 12771f12bd06SLiu Bo /* 12781f12bd06SLiu Bo * we unlocked the page above, so we need check if 12791f12bd06SLiu Bo * it was released or not. 12801f12bd06SLiu Bo */ 12811f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 12821f12bd06SLiu Bo unlock_page(page); 128309cbfeafSKirill A. Shutemov put_page(page); 12841f12bd06SLiu Bo goto again; 12851f12bd06SLiu Bo } 1286600a45e1SMiao Xie } 1287600a45e1SMiao Xie 12884cb5300bSChris Mason if (!PageUptodate(page)) { 12894cb5300bSChris Mason btrfs_readpage(NULL, page); 12904cb5300bSChris Mason lock_page(page); 12914cb5300bSChris Mason if (!PageUptodate(page)) { 12924cb5300bSChris Mason unlock_page(page); 129309cbfeafSKirill A. Shutemov put_page(page); 12944cb5300bSChris Mason ret = -EIO; 12954cb5300bSChris Mason break; 12964cb5300bSChris Mason } 12974cb5300bSChris Mason } 1298600a45e1SMiao Xie 1299600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1300600a45e1SMiao Xie unlock_page(page); 130109cbfeafSKirill A. Shutemov put_page(page); 1302600a45e1SMiao Xie goto again; 1303600a45e1SMiao Xie } 1304600a45e1SMiao Xie 13054cb5300bSChris Mason pages[i] = page; 13064cb5300bSChris Mason i_done++; 13074cb5300bSChris Mason } 13084cb5300bSChris Mason if (!i_done || ret) 13094cb5300bSChris Mason goto out; 13104cb5300bSChris Mason 13111751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13124cb5300bSChris Mason goto out; 13134cb5300bSChris Mason 13144cb5300bSChris Mason /* 13154cb5300bSChris Mason * so now we have a nice long stream of locked 13164cb5300bSChris Mason * and up to date pages, lets wait on them 13174cb5300bSChris Mason */ 13184cb5300bSChris Mason for (i = 0; i < i_done; i++) 13194cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13204cb5300bSChris Mason 13214cb5300bSChris Mason page_start = page_offset(pages[0]); 132209cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13234cb5300bSChris Mason 13244cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1325ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13267f458a38SFilipe Manana 13277f458a38SFilipe Manana /* 13287f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 13297f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 13307f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 13317f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 13327f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 13337f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 13347f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 13357f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 13367f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 13377f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 13387f458a38SFilipe Manana * out if that happened. 13397f458a38SFilipe Manana */ 13407f458a38SFilipe Manana search_start = page_start; 13417f458a38SFilipe Manana while (search_start < page_end) { 13427f458a38SFilipe Manana struct extent_map *em; 13437f458a38SFilipe Manana 13447f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 13457f458a38SFilipe Manana page_end - search_start); 13467f458a38SFilipe Manana if (IS_ERR(em)) { 13477f458a38SFilipe Manana ret = PTR_ERR(em); 13487f458a38SFilipe Manana goto out_unlock_range; 13497f458a38SFilipe Manana } 13507f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 13517f458a38SFilipe Manana free_extent_map(em); 13527f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 13537f458a38SFilipe Manana ret = 0; 13547f458a38SFilipe Manana goto out_unlock_range; 13557f458a38SFilipe Manana } 13567f458a38SFilipe Manana search_start = extent_map_end(em); 13577f458a38SFilipe Manana free_extent_map(em); 13587f458a38SFilipe Manana } 13597f458a38SFilipe Manana 13604cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1361e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1362e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13634cb5300bSChris Mason 13641f12bd06SLiu Bo if (i_done != page_cnt) { 13659e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 136628c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13679e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 136886d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1369a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 13704cb5300bSChris Mason } 13714cb5300bSChris Mason 13724cb5300bSChris Mason 13739e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1374018ed4f7SDavid Sterba &cached_state); 13754cb5300bSChris Mason 13764cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1377e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 13784cb5300bSChris Mason 13794cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13804cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 13814cb5300bSChris Mason ClearPageChecked(pages[i]); 13824cb5300bSChris Mason set_page_dirty(pages[i]); 13834cb5300bSChris Mason unlock_page(pages[i]); 138409cbfeafSKirill A. Shutemov put_page(pages[i]); 13854cb5300bSChris Mason } 13868702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1387364ecf36SQu Wenruo extent_changeset_free(data_reserved); 13884cb5300bSChris Mason return i_done; 13897f458a38SFilipe Manana 13907f458a38SFilipe Manana out_unlock_range: 13917f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 13927f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 13934cb5300bSChris Mason out: 13944cb5300bSChris Mason for (i = 0; i < i_done; i++) { 13954cb5300bSChris Mason unlock_page(pages[i]); 139609cbfeafSKirill A. Shutemov put_page(pages[i]); 13974cb5300bSChris Mason } 139886d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1399a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14008702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1401364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14024cb5300bSChris Mason return ret; 14034cb5300bSChris Mason 14044cb5300bSChris Mason } 14054cb5300bSChris Mason 14064cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14074cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14084cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14094cb5300bSChris Mason { 14100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14114cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14124cb5300bSChris Mason struct file_ra_state *ra = NULL; 14134cb5300bSChris Mason unsigned long last_index; 1414151a31b2SLi Zefan u64 isize = i_size_read(inode); 1415940100a4SChris Mason u64 last_len = 0; 1416940100a4SChris Mason u64 skip = 0; 1417940100a4SChris Mason u64 defrag_end = 0; 14184cb5300bSChris Mason u64 newer_off = range->start; 1419f46b5a66SChristoph Hellwig unsigned long i; 1420008873eaSLi Zefan unsigned long ra_index = 0; 1421f46b5a66SChristoph Hellwig int ret; 14224cb5300bSChris Mason int defrag_count = 0; 14231a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1424aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 142509cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1426c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1427ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14284cb5300bSChris Mason struct page **pages = NULL; 14291e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14304cb5300bSChris Mason 14310abd5b17SLiu Bo if (isize == 0) 14320abd5b17SLiu Bo return 0; 14330abd5b17SLiu Bo 14340abd5b17SLiu Bo if (range->start >= isize) 14350abd5b17SLiu Bo return -EINVAL; 14361a419d85SLi Zefan 14371e2ef46dSDavid Sterba if (do_compress) { 1438ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14391a419d85SLi Zefan return -EINVAL; 14401a419d85SLi Zefan if (range->compress_type) 14411a419d85SLi Zefan compress_type = range->compress_type; 14421a419d85SLi Zefan } 1443f46b5a66SChristoph Hellwig 14440abd5b17SLiu Bo if (extent_thresh == 0) 1445ee22184bSByongho Lee extent_thresh = SZ_256K; 1446f46b5a66SChristoph Hellwig 14474cb5300bSChris Mason /* 14480a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 14490a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 14500a52d108SDavid Sterba * we don't error out. 14514cb5300bSChris Mason */ 14524cb5300bSChris Mason if (!file) { 145363e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 14540a52d108SDavid Sterba if (ra) 14554cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 14564cb5300bSChris Mason } else { 14574cb5300bSChris Mason ra = &file->f_ra; 14584cb5300bSChris Mason } 14594cb5300bSChris Mason 146063e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 14614cb5300bSChris Mason if (!pages) { 14624cb5300bSChris Mason ret = -ENOMEM; 14634cb5300bSChris Mason goto out_ra; 14644cb5300bSChris Mason } 14654cb5300bSChris Mason 14664cb5300bSChris Mason /* find the last page to defrag */ 14671e701a32SChris Mason if (range->start + range->len > range->start) { 1468151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 146909cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 14701e701a32SChris Mason } else { 147109cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 14721e701a32SChris Mason } 14731e701a32SChris Mason 14744cb5300bSChris Mason if (newer_than) { 14754cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1476ee22184bSByongho Lee &newer_off, SZ_64K); 14774cb5300bSChris Mason if (!ret) { 14784cb5300bSChris Mason range->start = newer_off; 14794cb5300bSChris Mason /* 14804cb5300bSChris Mason * we always align our defrag to help keep 14814cb5300bSChris Mason * the extents in the file evenly spaced 14824cb5300bSChris Mason */ 148309cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 14844cb5300bSChris Mason } else 14854cb5300bSChris Mason goto out_ra; 14864cb5300bSChris Mason } else { 148709cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 14884cb5300bSChris Mason } 14894cb5300bSChris Mason if (!max_to_defrag) 1490070034bdSchandan max_to_defrag = last_index - i + 1; 14914cb5300bSChris Mason 14922a0f7f57SLi Zefan /* 14932a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 14942a0f7f57SLi Zefan * written sequentially. 14952a0f7f57SLi Zefan */ 14962a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 14972a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 14982a0f7f57SLi Zefan 1499f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 150009cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15014cb5300bSChris Mason /* 15024cb5300bSChris Mason * make sure we stop running if someone unmounts 15034cb5300bSChris Mason * the FS 15044cb5300bSChris Mason */ 15051751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15064cb5300bSChris Mason break; 15074cb5300bSChris Mason 15080b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15090b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1510210549ebSDavid Sterba ret = -EAGAIN; 151150535db8STian Tao goto error; 1512210549ebSDavid Sterba } 1513210549ebSDavid Sterba 151409cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15156c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15161e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1517940100a4SChris Mason unsigned long next; 1518940100a4SChris Mason /* 1519940100a4SChris Mason * the should_defrag function tells us how much to skip 1520940100a4SChris Mason * bump our counter by the suggested amount 1521940100a4SChris Mason */ 152209cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1523940100a4SChris Mason i = max(i + 1, next); 1524940100a4SChris Mason continue; 1525940100a4SChris Mason } 1526008873eaSLi Zefan 1527008873eaSLi Zefan if (!newer_than) { 152809cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 152909cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1530008873eaSLi Zefan cluster = min(cluster, max_cluster); 1531008873eaSLi Zefan } else { 1532008873eaSLi Zefan cluster = max_cluster; 1533008873eaSLi Zefan } 1534008873eaSLi Zefan 1535008873eaSLi Zefan if (i + cluster > ra_index) { 1536008873eaSLi Zefan ra_index = max(i, ra_index); 15370a52d108SDavid Sterba if (ra) 1538d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1539d3c0bab5SDavid Sterba file, ra_index, cluster); 1540e4826a5bSchandan ra_index += cluster; 1541008873eaSLi Zefan } 15424cb5300bSChris Mason 154364708539SJosef Bacik btrfs_inode_lock(inode, 0); 1544eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1545eede2bf3SOmar Sandoval ret = -ETXTBSY; 1546eede2bf3SOmar Sandoval } else { 15471e2ef46dSDavid Sterba if (do_compress) 1548eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1549008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1550eede2bf3SOmar Sandoval } 1551ecb8bea8SLiu Bo if (ret < 0) { 155264708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15534cb5300bSChris Mason goto out_ra; 1554ecb8bea8SLiu Bo } 15554cb5300bSChris Mason 15564cb5300bSChris Mason defrag_count += ret; 1557d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 155864708539SJosef Bacik btrfs_inode_unlock(inode, 0); 15594cb5300bSChris Mason 15604cb5300bSChris Mason if (newer_than) { 15614cb5300bSChris Mason if (newer_off == (u64)-1) 15624cb5300bSChris Mason break; 15634cb5300bSChris Mason 1564e1f041e1SLiu Bo if (ret > 0) 1565e1f041e1SLiu Bo i += ret; 1566e1f041e1SLiu Bo 15674cb5300bSChris Mason newer_off = max(newer_off + 1, 156809cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 15694cb5300bSChris Mason 1570ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1571ee22184bSByongho Lee &newer_off, SZ_64K); 15724cb5300bSChris Mason if (!ret) { 15734cb5300bSChris Mason range->start = newer_off; 157409cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15754cb5300bSChris Mason } else { 15764cb5300bSChris Mason break; 1577940100a4SChris Mason } 15784cb5300bSChris Mason } else { 1579008873eaSLi Zefan if (ret > 0) { 1580cbcc8326SLi Zefan i += ret; 158109cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1582008873eaSLi Zefan } else { 1583940100a4SChris Mason i++; 1584008873eaSLi Zefan last_len = 0; 1585008873eaSLi Zefan } 1586f46b5a66SChristoph Hellwig } 15874cb5300bSChris Mason } 1588f46b5a66SChristoph Hellwig 158950535db8STian Tao ret = defrag_count; 159050535db8STian Tao error: 1591dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 15921e701a32SChris Mason filemap_flush(inode->i_mapping); 1593dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1594dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1595dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1596dec8ef90SFilipe Manana } 15971e701a32SChris Mason 15981a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 15990b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16005c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16015c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16021a419d85SLi Zefan } 16031a419d85SLi Zefan 16044cb5300bSChris Mason out_ra: 16051e2ef46dSDavid Sterba if (do_compress) { 160664708539SJosef Bacik btrfs_inode_lock(inode, 0); 1607eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 160864708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1609633085c7SFilipe David Borba Manana } 16104cb5300bSChris Mason if (!file) 16114cb5300bSChris Mason kfree(ra); 16124cb5300bSChris Mason kfree(pages); 1613940100a4SChris Mason return ret; 1614f46b5a66SChristoph Hellwig } 1615f46b5a66SChristoph Hellwig 161617aaa434SDavid Sterba /* 161717aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 161817aaa434SDavid Sterba * 161917aaa434SDavid Sterba * Return: 162017aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 162117aaa434SDavid Sterba * >0 - normal mode, something else is running, 162217aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 162317aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 162417aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 162517aaa434SDavid Sterba */ 162617aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 162717aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 162817aaa434SDavid Sterba { 162917aaa434SDavid Sterba if (!cancel) { 163017aaa434SDavid Sterba /* Start normal op */ 163117aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 163217aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 163317aaa434SDavid Sterba /* Exclusive operation is now claimed */ 163417aaa434SDavid Sterba return 0; 163517aaa434SDavid Sterba } 163617aaa434SDavid Sterba 163717aaa434SDavid Sterba /* Cancel running op */ 163817aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 163917aaa434SDavid Sterba /* 164017aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 164117aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 164217aaa434SDavid Sterba * or it has finished and no waiting will happen. 164317aaa434SDavid Sterba */ 164417aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 164517aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 164617aaa434SDavid Sterba 164717aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 164817aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 164917aaa434SDavid Sterba TASK_INTERRUPTIBLE); 165017aaa434SDavid Sterba 165117aaa434SDavid Sterba return -ECANCELED; 165217aaa434SDavid Sterba } 165317aaa434SDavid Sterba 165417aaa434SDavid Sterba /* Something else is running or none */ 165517aaa434SDavid Sterba return -ENOTCONN; 165617aaa434SDavid Sterba } 165717aaa434SDavid Sterba 1658198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 165976dda93cSYan, Zheng void __user *arg) 1660f46b5a66SChristoph Hellwig { 16610b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1663f46b5a66SChristoph Hellwig u64 new_size; 1664f46b5a66SChristoph Hellwig u64 old_size; 1665f46b5a66SChristoph Hellwig u64 devid = 1; 16660b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1667f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1668f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1669f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1670f46b5a66SChristoph Hellwig char *sizestr; 16719a40f122SGui Hecheng char *retptr; 1672f46b5a66SChristoph Hellwig char *devstr = NULL; 1673f46b5a66SChristoph Hellwig int ret = 0; 1674f46b5a66SChristoph Hellwig int mod = 0; 1675bb059a37SDavid Sterba bool cancel; 1676f46b5a66SChristoph Hellwig 1677e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1678e441d54dSChris Mason return -EPERM; 1679e441d54dSChris Mason 1680198605a8SMiao Xie ret = mnt_want_write_file(file); 1681198605a8SMiao Xie if (ret) 1682198605a8SMiao Xie return ret; 1683198605a8SMiao Xie 1684bb059a37SDavid Sterba /* 1685bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1686bb059a37SDavid Sterba * distinguish regular resize and cancel 1687bb059a37SDavid Sterba */ 1688dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1689c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1690c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1691bb059a37SDavid Sterba goto out_drop; 1692c9e9f97bSIlya Dryomov } 16935516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1694f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1695bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1696bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1697bb059a37SDavid Sterba if (ret) 1698bb059a37SDavid Sterba goto out_free; 1699bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1700bb059a37SDavid Sterba 1701f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1702f46b5a66SChristoph Hellwig if (devstr) { 1703f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1704f46b5a66SChristoph Hellwig *devstr = '\0'; 1705f46b5a66SChristoph Hellwig devstr = vol_args->name; 170658dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 170758dfae63SZhangZhen if (ret) 1708bb059a37SDavid Sterba goto out_finish; 1709dfd79829SMiao Xie if (!devid) { 1710dfd79829SMiao Xie ret = -EINVAL; 1711bb059a37SDavid Sterba goto out_finish; 1712dfd79829SMiao Xie } 17130b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1714f46b5a66SChristoph Hellwig } 1715dba60f3fSMiao Xie 1716b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1717f46b5a66SChristoph Hellwig if (!device) { 17180b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1719c1c9ff7cSGeert Uytterhoeven devid); 1720dfd79829SMiao Xie ret = -ENODEV; 1721bb059a37SDavid Sterba goto out_finish; 1722f46b5a66SChristoph Hellwig } 1723dba60f3fSMiao Xie 1724ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17250b246afaSJeff Mahoney btrfs_info(fs_info, 1726efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1727c1c9ff7cSGeert Uytterhoeven devid); 1728dfd79829SMiao Xie ret = -EPERM; 1729bb059a37SDavid Sterba goto out_finish; 17304e42ae1bSLiu Bo } 17314e42ae1bSLiu Bo 1732f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1733f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1734f46b5a66SChristoph Hellwig else { 1735f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1736f46b5a66SChristoph Hellwig mod = -1; 1737f46b5a66SChristoph Hellwig sizestr++; 1738f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1739f46b5a66SChristoph Hellwig mod = 1; 1740f46b5a66SChristoph Hellwig sizestr++; 1741f46b5a66SChristoph Hellwig } 17429a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17439a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1744f46b5a66SChristoph Hellwig ret = -EINVAL; 1745bb059a37SDavid Sterba goto out_finish; 1746f46b5a66SChristoph Hellwig } 1747f46b5a66SChristoph Hellwig } 1748f46b5a66SChristoph Hellwig 1749401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1750dfd79829SMiao Xie ret = -EPERM; 1751bb059a37SDavid Sterba goto out_finish; 175263a212abSStefan Behrens } 175363a212abSStefan Behrens 17547cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1755f46b5a66SChristoph Hellwig 1756f46b5a66SChristoph Hellwig if (mod < 0) { 1757f46b5a66SChristoph Hellwig if (new_size > old_size) { 1758f46b5a66SChristoph Hellwig ret = -EINVAL; 1759bb059a37SDavid Sterba goto out_finish; 1760f46b5a66SChristoph Hellwig } 1761f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1762f46b5a66SChristoph Hellwig } else if (mod > 0) { 1763eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1764902c68a4SGui Hecheng ret = -ERANGE; 1765bb059a37SDavid Sterba goto out_finish; 1766eb8052e0SWenliang Fan } 1767f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1768f46b5a66SChristoph Hellwig } 1769f46b5a66SChristoph Hellwig 1770ee22184bSByongho Lee if (new_size < SZ_256M) { 1771f46b5a66SChristoph Hellwig ret = -EINVAL; 1772bb059a37SDavid Sterba goto out_finish; 1773f46b5a66SChristoph Hellwig } 1774f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1775f46b5a66SChristoph Hellwig ret = -EFBIG; 1776bb059a37SDavid Sterba goto out_finish; 1777f46b5a66SChristoph Hellwig } 1778f46b5a66SChristoph Hellwig 177947f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1780f46b5a66SChristoph Hellwig 1781f46b5a66SChristoph Hellwig if (new_size > old_size) { 1782a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 178398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 178498d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1785bb059a37SDavid Sterba goto out_finish; 178698d5dc13STsutomu Itoh } 1787f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17883a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1789ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1790f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 17910253f40eSjeff.liu } /* equal, nothing need to do */ 1792f46b5a66SChristoph Hellwig 1793faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1794faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1795faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1796faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1797faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1798bb059a37SDavid Sterba out_finish: 1799bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1800c9e9f97bSIlya Dryomov out_free: 1801f46b5a66SChristoph Hellwig kfree(vol_args); 1802bb059a37SDavid Sterba out_drop: 180318f39c41SIlya Dryomov mnt_drop_write_file(file); 1804f46b5a66SChristoph Hellwig return ret; 1805f46b5a66SChristoph Hellwig } 1806f46b5a66SChristoph Hellwig 18075d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 18084d4340c9SChristian Brauner struct user_namespace *mnt_userns, 180952f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18105d54c67eSNikolay Borisov bool readonly, 18118696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1812f46b5a66SChristoph Hellwig { 1813f46b5a66SChristoph Hellwig int namelen; 18143de4586cSChris Mason int ret = 0; 1815f46b5a66SChristoph Hellwig 1816325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1817325c50e3SJeff Mahoney return -ENOTDIR; 1818325c50e3SJeff Mahoney 1819a874a63eSLiu Bo ret = mnt_want_write_file(file); 1820a874a63eSLiu Bo if (ret) 1821a874a63eSLiu Bo goto out; 1822a874a63eSLiu Bo 182372fd032eSSage Weil namelen = strlen(name); 182472fd032eSSage Weil if (strchr(name, '/')) { 1825f46b5a66SChristoph Hellwig ret = -EINVAL; 1826a874a63eSLiu Bo goto out_drop_write; 1827f46b5a66SChristoph Hellwig } 1828f46b5a66SChristoph Hellwig 182916780cabSChris Mason if (name[0] == '.' && 183016780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 183116780cabSChris Mason ret = -EEXIST; 1832a874a63eSLiu Bo goto out_drop_write; 183316780cabSChris Mason } 183416780cabSChris Mason 18353de4586cSChris Mason if (subvol) { 18364d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 18374d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1838cb8e7090SChristoph Hellwig } else { 18392903ff01SAl Viro struct fd src = fdget(fd); 18403de4586cSChris Mason struct inode *src_inode; 18412903ff01SAl Viro if (!src.file) { 18423de4586cSChris Mason ret = -EINVAL; 1843a874a63eSLiu Bo goto out_drop_write; 18443de4586cSChris Mason } 18453de4586cSChris Mason 1846496ad9aaSAl Viro src_inode = file_inode(src.file); 1847496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1848c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1849efe120a0SFrank Holton "Snapshot src from another FS"); 185023ad5b17SKusanagi Kouichi ret = -EXDEV; 18514d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 1852d0242061SDavid Sterba /* 1853d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1854d0242061SDavid Sterba * are limited to own subvolumes only 1855d0242061SDavid Sterba */ 1856d0242061SDavid Sterba ret = -EPERM; 1857ecd18815SAl Viro } else { 18584d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 18594d4340c9SChristian Brauner name, namelen, 186072fd032eSSage Weil BTRFS_I(src_inode)->root, 18615d54c67eSNikolay Borisov readonly, inherit); 1862ecd18815SAl Viro } 18632903ff01SAl Viro fdput(src); 1864cb8e7090SChristoph Hellwig } 1865a874a63eSLiu Bo out_drop_write: 1866a874a63eSLiu Bo mnt_drop_write_file(file); 1867f46b5a66SChristoph Hellwig out: 186872fd032eSSage Weil return ret; 186972fd032eSSage Weil } 187072fd032eSSage Weil 187172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1872fa0d2b9bSLi Zefan void __user *arg, int subvol) 187372fd032eSSage Weil { 1874fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 187572fd032eSSage Weil int ret; 187672fd032eSSage Weil 1877325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1878325c50e3SJeff Mahoney return -ENOTDIR; 1879325c50e3SJeff Mahoney 1880fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1881fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1882fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1883fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1884fa0d2b9bSLi Zefan 18854d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 18864d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 18874d4340c9SChristian Brauner false, NULL); 1888fa0d2b9bSLi Zefan 1889fa0d2b9bSLi Zefan kfree(vol_args); 1890fa0d2b9bSLi Zefan return ret; 1891fa0d2b9bSLi Zefan } 1892fa0d2b9bSLi Zefan 1893fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1894fa0d2b9bSLi Zefan void __user *arg, int subvol) 1895fa0d2b9bSLi Zefan { 1896fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1897fa0d2b9bSLi Zefan int ret; 1898b83cc969SLi Zefan bool readonly = false; 18996f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 190072fd032eSSage Weil 1901325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1902325c50e3SJeff Mahoney return -ENOTDIR; 1903325c50e3SJeff Mahoney 1904fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1905fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1906fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1907fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1908fdfb1e4fSLi Zefan 1909673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1910b83cc969SLi Zefan ret = -EOPNOTSUPP; 1911c47ca32dSDan Carpenter goto free_args; 1912fdfb1e4fSLi Zefan } 1913fdfb1e4fSLi Zefan 1914b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1915b83cc969SLi Zefan readonly = true; 19166f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 19175011c5a6SDan Carpenter u64 nums; 19185011c5a6SDan Carpenter 19195011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 19205011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 19216f72c7e2SArne Jansen ret = -EINVAL; 1922c47ca32dSDan Carpenter goto free_args; 19236f72c7e2SArne Jansen } 19246f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19256f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19266f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1927c47ca32dSDan Carpenter goto free_args; 19286f72c7e2SArne Jansen } 19295011c5a6SDan Carpenter 19305011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 19315011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 19325011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 19335011c5a6SDan Carpenter ret = -EINVAL; 19345011c5a6SDan Carpenter goto free_inherit; 19355011c5a6SDan Carpenter } 19365011c5a6SDan Carpenter 19375011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 19385011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 19395011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 19405011c5a6SDan Carpenter ret = -EINVAL; 19415011c5a6SDan Carpenter goto free_inherit; 19425011c5a6SDan Carpenter } 19436f72c7e2SArne Jansen } 194475eaa0e2SSage Weil 19454d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 19464d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 19474d4340c9SChristian Brauner readonly, inherit); 1948c47ca32dSDan Carpenter if (ret) 1949c47ca32dSDan Carpenter goto free_inherit; 1950c47ca32dSDan Carpenter free_inherit: 19516f72c7e2SArne Jansen kfree(inherit); 1952c47ca32dSDan Carpenter free_args: 1953c47ca32dSDan Carpenter kfree(vol_args); 1954f46b5a66SChristoph Hellwig return ret; 1955f46b5a66SChristoph Hellwig } 1956f46b5a66SChristoph Hellwig 19570caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19580caa102dSLi Zefan void __user *arg) 19590caa102dSLi Zefan { 1960496ad9aaSAl Viro struct inode *inode = file_inode(file); 19610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19620caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19630caa102dSLi Zefan int ret = 0; 19640caa102dSLi Zefan u64 flags = 0; 19650caa102dSLi Zefan 19664a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19670caa102dSLi Zefan return -EINVAL; 19680caa102dSLi Zefan 19690b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19700caa102dSLi Zefan if (btrfs_root_readonly(root)) 19710caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19720b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19730caa102dSLi Zefan 19740caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19750caa102dSLi Zefan ret = -EFAULT; 19760caa102dSLi Zefan 19770caa102dSLi Zefan return ret; 19780caa102dSLi Zefan } 19790caa102dSLi Zefan 19800caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19810caa102dSLi Zefan void __user *arg) 19820caa102dSLi Zefan { 1983496ad9aaSAl Viro struct inode *inode = file_inode(file); 19840b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19850caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19860caa102dSLi Zefan struct btrfs_trans_handle *trans; 19870caa102dSLi Zefan u64 root_flags; 19880caa102dSLi Zefan u64 flags; 19890caa102dSLi Zefan int ret = 0; 19900caa102dSLi Zefan 199139e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 1992bd60ea0fSDavid Sterba return -EPERM; 1993bd60ea0fSDavid Sterba 1994b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1995b9ca0664SLiu Bo if (ret) 1996b9ca0664SLiu Bo goto out; 19970caa102dSLi Zefan 19984a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1999b9ca0664SLiu Bo ret = -EINVAL; 2000b9ca0664SLiu Bo goto out_drop_write; 2001b9ca0664SLiu Bo } 20020caa102dSLi Zefan 2003b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2004b9ca0664SLiu Bo ret = -EFAULT; 2005b9ca0664SLiu Bo goto out_drop_write; 2006b9ca0664SLiu Bo } 20070caa102dSLi Zefan 2008b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2009b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2010b9ca0664SLiu Bo goto out_drop_write; 2011b9ca0664SLiu Bo } 20120caa102dSLi Zefan 20130b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20140caa102dSLi Zefan 20150caa102dSLi Zefan /* nothing to do */ 20160caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2017b9ca0664SLiu Bo goto out_drop_sem; 20180caa102dSLi Zefan 20190caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20202c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20210caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20220caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20232c686537SDavid Sterba } else { 20242c686537SDavid Sterba /* 20252c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20262c686537SDavid Sterba * send 20272c686537SDavid Sterba */ 20282c686537SDavid Sterba spin_lock(&root->root_item_lock); 20292c686537SDavid Sterba if (root->send_in_progress == 0) { 20300caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20310caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20322c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20332c686537SDavid Sterba } else { 20342c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20350b246afaSJeff Mahoney btrfs_warn(fs_info, 20362c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20372c686537SDavid Sterba root->root_key.objectid); 20382c686537SDavid Sterba ret = -EPERM; 20392c686537SDavid Sterba goto out_drop_sem; 20402c686537SDavid Sterba } 20412c686537SDavid Sterba } 20420caa102dSLi Zefan 20430caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20440caa102dSLi Zefan if (IS_ERR(trans)) { 20450caa102dSLi Zefan ret = PTR_ERR(trans); 20460caa102dSLi Zefan goto out_reset; 20470caa102dSLi Zefan } 20480caa102dSLi Zefan 20490b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20500caa102dSLi Zefan &root->root_key, &root->root_item); 20519417ebc8SNikolay Borisov if (ret < 0) { 20529417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20539417ebc8SNikolay Borisov goto out_reset; 20549417ebc8SNikolay Borisov } 20550caa102dSLi Zefan 20569417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20579417ebc8SNikolay Borisov 20580caa102dSLi Zefan out_reset: 20590caa102dSLi Zefan if (ret) 20600caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2061b9ca0664SLiu Bo out_drop_sem: 20620b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2063b9ca0664SLiu Bo out_drop_write: 2064b9ca0664SLiu Bo mnt_drop_write_file(file); 2065b9ca0664SLiu Bo out: 20660caa102dSLi Zefan return ret; 20670caa102dSLi Zefan } 20680caa102dSLi Zefan 2069ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2070ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2071ac8e9819SChris Mason { 2072abc6e134SChris Mason struct btrfs_key test; 2073abc6e134SChris Mason int ret; 2074abc6e134SChris Mason 2075abc6e134SChris Mason test.objectid = sk->min_objectid; 2076abc6e134SChris Mason test.type = sk->min_type; 2077abc6e134SChris Mason test.offset = sk->min_offset; 2078abc6e134SChris Mason 2079abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2080abc6e134SChris Mason if (ret < 0) 2081ac8e9819SChris Mason return 0; 2082abc6e134SChris Mason 2083abc6e134SChris Mason test.objectid = sk->max_objectid; 2084abc6e134SChris Mason test.type = sk->max_type; 2085abc6e134SChris Mason test.offset = sk->max_offset; 2086abc6e134SChris Mason 2087abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2088abc6e134SChris Mason if (ret > 0) 2089ac8e9819SChris Mason return 0; 2090ac8e9819SChris Mason return 1; 2091ac8e9819SChris Mason } 2092ac8e9819SChris Mason 2093df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2094ac8e9819SChris Mason struct btrfs_key *key, 2095ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20969b6e817dSGerhard Heift size_t *buf_size, 2097ba346b35SGerhard Heift char __user *ubuf, 2098ac8e9819SChris Mason unsigned long *sk_offset, 2099ac8e9819SChris Mason int *num_found) 2100ac8e9819SChris Mason { 2101ac8e9819SChris Mason u64 found_transid; 2102ac8e9819SChris Mason struct extent_buffer *leaf; 2103ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2104dd81d459SNaohiro Aota struct btrfs_key test; 2105ac8e9819SChris Mason unsigned long item_off; 2106ac8e9819SChris Mason unsigned long item_len; 2107ac8e9819SChris Mason int nritems; 2108ac8e9819SChris Mason int i; 2109ac8e9819SChris Mason int slot; 2110ac8e9819SChris Mason int ret = 0; 2111ac8e9819SChris Mason 2112ac8e9819SChris Mason leaf = path->nodes[0]; 2113ac8e9819SChris Mason slot = path->slots[0]; 2114ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2115ac8e9819SChris Mason 2116ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2117ac8e9819SChris Mason i = nritems; 2118ac8e9819SChris Mason goto advance_key; 2119ac8e9819SChris Mason } 2120ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2121ac8e9819SChris Mason 2122ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2123ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2124ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2125ac8e9819SChris Mason 212603b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 212703b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 212803b71c6cSGabriel de Perthuis continue; 212903b71c6cSGabriel de Perthuis 21309b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21318f5f6178SGerhard Heift if (*num_found) { 2132ac8e9819SChris Mason ret = 1; 21338f5f6178SGerhard Heift goto out; 21348f5f6178SGerhard Heift } 21358f5f6178SGerhard Heift 21368f5f6178SGerhard Heift /* 21378f5f6178SGerhard Heift * return one empty item back for v1, which does not 21388f5f6178SGerhard Heift * handle -EOVERFLOW 21398f5f6178SGerhard Heift */ 21408f5f6178SGerhard Heift 21419b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2142ac8e9819SChris Mason item_len = 0; 21438f5f6178SGerhard Heift ret = -EOVERFLOW; 21448f5f6178SGerhard Heift } 2145ac8e9819SChris Mason 21469b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2147ac8e9819SChris Mason ret = 1; 214825c9bc2eSGerhard Heift goto out; 2149ac8e9819SChris Mason } 2150ac8e9819SChris Mason 2151ac8e9819SChris Mason sh.objectid = key->objectid; 2152ac8e9819SChris Mason sh.offset = key->offset; 2153ac8e9819SChris Mason sh.type = key->type; 2154ac8e9819SChris Mason sh.len = item_len; 2155ac8e9819SChris Mason sh.transid = found_transid; 2156ac8e9819SChris Mason 2157a48b73ecSJosef Bacik /* 2158a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2159a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2160a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2161a48b73ecSJosef Bacik * properly this next time through 2162a48b73ecSJosef Bacik */ 2163a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2164a48b73ecSJosef Bacik ret = 0; 2165ba346b35SGerhard Heift goto out; 2166ba346b35SGerhard Heift } 2167ba346b35SGerhard Heift 2168ac8e9819SChris Mason *sk_offset += sizeof(sh); 2169ac8e9819SChris Mason 2170ac8e9819SChris Mason if (item_len) { 2171ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2172a48b73ecSJosef Bacik /* 2173a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2174a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2175a48b73ecSJosef Bacik */ 2176a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2177ba346b35SGerhard Heift item_off, item_len)) { 2178a48b73ecSJosef Bacik ret = 0; 2179a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2180ba346b35SGerhard Heift goto out; 2181ba346b35SGerhard Heift } 2182ba346b35SGerhard Heift 2183ac8e9819SChris Mason *sk_offset += item_len; 2184ac8e9819SChris Mason } 2185e2156867SHugo Mills (*num_found)++; 2186ac8e9819SChris Mason 21878f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21888f5f6178SGerhard Heift goto out; 21898f5f6178SGerhard Heift 219025c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 219125c9bc2eSGerhard Heift ret = 1; 219225c9bc2eSGerhard Heift goto out; 219325c9bc2eSGerhard Heift } 2194ac8e9819SChris Mason } 2195ac8e9819SChris Mason advance_key: 2196ac8e9819SChris Mason ret = 0; 2197dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2198dd81d459SNaohiro Aota test.type = sk->max_type; 2199dd81d459SNaohiro Aota test.offset = sk->max_offset; 2200dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2201dd81d459SNaohiro Aota ret = 1; 2202dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2203abc6e134SChris Mason key->offset++; 2204dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2205abc6e134SChris Mason key->offset = 0; 2206abc6e134SChris Mason key->type++; 2207dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2208abc6e134SChris Mason key->offset = 0; 2209abc6e134SChris Mason key->type = 0; 2210abc6e134SChris Mason key->objectid++; 2211abc6e134SChris Mason } else 2212abc6e134SChris Mason ret = 1; 221325c9bc2eSGerhard Heift out: 2214ba346b35SGerhard Heift /* 2215ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2216ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2217ba346b35SGerhard Heift * * all items were found 2218ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2219ba346b35SGerhard Heift * leaf 2220ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2221ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2222ba346b35SGerhard Heift */ 2223ac8e9819SChris Mason return ret; 2224ac8e9819SChris Mason } 2225ac8e9819SChris Mason 2226ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 222712544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22289b6e817dSGerhard Heift size_t *buf_size, 2229ba346b35SGerhard Heift char __user *ubuf) 2230ac8e9819SChris Mason { 22310b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2232ac8e9819SChris Mason struct btrfs_root *root; 2233ac8e9819SChris Mason struct btrfs_key key; 2234ac8e9819SChris Mason struct btrfs_path *path; 2235ac8e9819SChris Mason int ret; 2236ac8e9819SChris Mason int num_found = 0; 2237ac8e9819SChris Mason unsigned long sk_offset = 0; 2238ac8e9819SChris Mason 22399b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22409b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 224112544442SGerhard Heift return -EOVERFLOW; 22429b6e817dSGerhard Heift } 224312544442SGerhard Heift 2244ac8e9819SChris Mason path = btrfs_alloc_path(); 2245ac8e9819SChris Mason if (!path) 2246ac8e9819SChris Mason return -ENOMEM; 2247ac8e9819SChris Mason 2248ac8e9819SChris Mason if (sk->tree_id == 0) { 2249ac8e9819SChris Mason /* search the root of the inode that was passed */ 225000246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2251ac8e9819SChris Mason } else { 225256e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2253ac8e9819SChris Mason if (IS_ERR(root)) { 2254ac8e9819SChris Mason btrfs_free_path(path); 2255ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2256ac8e9819SChris Mason } 2257ac8e9819SChris Mason } 2258ac8e9819SChris Mason 2259ac8e9819SChris Mason key.objectid = sk->min_objectid; 2260ac8e9819SChris Mason key.type = sk->min_type; 2261ac8e9819SChris Mason key.offset = sk->min_offset; 2262ac8e9819SChris Mason 2263ac8e9819SChris Mason while (1) { 2264*bb523b40SAndreas Gruenbacher ret = -EFAULT; 2265*bb523b40SAndreas Gruenbacher if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset)) 2266a48b73ecSJosef Bacik break; 2267a48b73ecSJosef Bacik 22686174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2269ac8e9819SChris Mason if (ret != 0) { 2270ac8e9819SChris Mason if (ret > 0) 2271ac8e9819SChris Mason ret = 0; 2272ac8e9819SChris Mason goto err; 2273ac8e9819SChris Mason } 2274df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2275ac8e9819SChris Mason &sk_offset, &num_found); 2276b3b4aa74SDavid Sterba btrfs_release_path(path); 227725c9bc2eSGerhard Heift if (ret) 2278ac8e9819SChris Mason break; 2279ac8e9819SChris Mason 2280ac8e9819SChris Mason } 22818f5f6178SGerhard Heift if (ret > 0) 2282ac8e9819SChris Mason ret = 0; 2283ac8e9819SChris Mason err: 2284ac8e9819SChris Mason sk->nr_items = num_found; 228500246528SJosef Bacik btrfs_put_root(root); 2286ac8e9819SChris Mason btrfs_free_path(path); 2287ac8e9819SChris Mason return ret; 2288ac8e9819SChris Mason } 2289ac8e9819SChris Mason 2290ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2291ac8e9819SChris Mason void __user *argp) 2292ac8e9819SChris Mason { 2293ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2294ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2295ac8e9819SChris Mason struct inode *inode; 2296ac8e9819SChris Mason int ret; 22979b6e817dSGerhard Heift size_t buf_size; 2298ac8e9819SChris Mason 2299ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2300ac8e9819SChris Mason return -EPERM; 2301ac8e9819SChris Mason 2302ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2303ac8e9819SChris Mason 2304ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2305ba346b35SGerhard Heift return -EFAULT; 2306ba346b35SGerhard Heift 2307ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2308ac8e9819SChris Mason 2309496ad9aaSAl Viro inode = file_inode(file); 2310ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23118f5f6178SGerhard Heift 23128f5f6178SGerhard Heift /* 23138f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23148f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23158f5f6178SGerhard Heift */ 23168f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23178f5f6178SGerhard Heift ret = 0; 23188f5f6178SGerhard Heift 2319ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2320ac8e9819SChris Mason ret = -EFAULT; 2321ac8e9819SChris Mason return ret; 2322ac8e9819SChris Mason } 2323ac8e9819SChris Mason 2324cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2325cc68a8a5SGerhard Heift void __user *argp) 2326cc68a8a5SGerhard Heift { 2327cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2328cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2329cc68a8a5SGerhard Heift struct inode *inode; 2330cc68a8a5SGerhard Heift int ret; 2331cc68a8a5SGerhard Heift size_t buf_size; 2332ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2333cc68a8a5SGerhard Heift 2334cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2335cc68a8a5SGerhard Heift return -EPERM; 2336cc68a8a5SGerhard Heift 2337cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2338cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2339cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2340cc68a8a5SGerhard Heift return -EFAULT; 2341cc68a8a5SGerhard Heift 2342cc68a8a5SGerhard Heift buf_size = args.buf_size; 2343cc68a8a5SGerhard Heift 2344cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2345cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2346cc68a8a5SGerhard Heift buf_size = buf_limit; 2347cc68a8a5SGerhard Heift 2348cc68a8a5SGerhard Heift inode = file_inode(file); 2349cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2350718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2351cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2352cc68a8a5SGerhard Heift ret = -EFAULT; 2353cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2354cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2355cc68a8a5SGerhard Heift ret = -EFAULT; 2356cc68a8a5SGerhard Heift 235776dda93cSYan, Zheng return ret; 235876dda93cSYan, Zheng } 235976dda93cSYan, Zheng 236098d377a0STARUISI Hiroaki /* 2361ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2362ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 236398d377a0STARUISI Hiroaki */ 236498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 236598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 236698d377a0STARUISI Hiroaki { 236798d377a0STARUISI Hiroaki struct btrfs_root *root; 236898d377a0STARUISI Hiroaki struct btrfs_key key; 2369ac8e9819SChris Mason char *ptr; 237098d377a0STARUISI Hiroaki int ret = -1; 237198d377a0STARUISI Hiroaki int slot; 237298d377a0STARUISI Hiroaki int len; 237398d377a0STARUISI Hiroaki int total_len = 0; 237498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 237598d377a0STARUISI Hiroaki struct extent_buffer *l; 237698d377a0STARUISI Hiroaki struct btrfs_path *path; 237798d377a0STARUISI Hiroaki 237898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 237998d377a0STARUISI Hiroaki name[0]='\0'; 238098d377a0STARUISI Hiroaki return 0; 238198d377a0STARUISI Hiroaki } 238298d377a0STARUISI Hiroaki 238398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 238498d377a0STARUISI Hiroaki if (!path) 238598d377a0STARUISI Hiroaki return -ENOMEM; 238698d377a0STARUISI Hiroaki 2387c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 238898d377a0STARUISI Hiroaki 238956e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 239098d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2391ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 239288234012SJosef Bacik root = NULL; 239388234012SJosef Bacik goto out; 239488234012SJosef Bacik } 239598d377a0STARUISI Hiroaki 239698d377a0STARUISI Hiroaki key.objectid = dirid; 239798d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23988ad6fcabSChris Mason key.offset = (u64)-1; 239998d377a0STARUISI Hiroaki 240098d377a0STARUISI Hiroaki while (1) { 24010ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 240218674c6cSFilipe David Borba Manana if (ret < 0) 240318674c6cSFilipe David Borba Manana goto out; 240418674c6cSFilipe David Borba Manana else if (ret > 0) { 2405ac8e9819SChris Mason ret = -ENOENT; 240698d377a0STARUISI Hiroaki goto out; 2407ac8e9819SChris Mason } 240818674c6cSFilipe David Borba Manana 240918674c6cSFilipe David Borba Manana l = path->nodes[0]; 241018674c6cSFilipe David Borba Manana slot = path->slots[0]; 241198d377a0STARUISI Hiroaki 241298d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 241398d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 241498d377a0STARUISI Hiroaki ptr -= len + 1; 241598d377a0STARUISI Hiroaki total_len += len + 1; 2416a696cf35SFilipe David Borba Manana if (ptr < name) { 2417a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 241898d377a0STARUISI Hiroaki goto out; 2419a696cf35SFilipe David Borba Manana } 242098d377a0STARUISI Hiroaki 242198d377a0STARUISI Hiroaki *(ptr + len) = '/'; 242298d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 242398d377a0STARUISI Hiroaki 242498d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 242598d377a0STARUISI Hiroaki break; 242698d377a0STARUISI Hiroaki 2427b3b4aa74SDavid Sterba btrfs_release_path(path); 242898d377a0STARUISI Hiroaki key.objectid = key.offset; 24298ad6fcabSChris Mason key.offset = (u64)-1; 243098d377a0STARUISI Hiroaki dirid = key.objectid; 243198d377a0STARUISI Hiroaki } 243277906a50SLi Zefan memmove(name, ptr, total_len); 243398d377a0STARUISI Hiroaki name[total_len] = '\0'; 243498d377a0STARUISI Hiroaki ret = 0; 243598d377a0STARUISI Hiroaki out: 243600246528SJosef Bacik btrfs_put_root(root); 243798d377a0STARUISI Hiroaki btrfs_free_path(path); 2438ac8e9819SChris Mason return ret; 2439ac8e9819SChris Mason } 2440ac8e9819SChris Mason 24416623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 24426623d9a0SChristian Brauner struct inode *inode, 244323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 244423d0b79dSTomohiro Misono { 244523d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 244623d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 244723d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 244823d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 244923d0b79dSTomohiro Misono u64 dirid = args->dirid; 245023d0b79dSTomohiro Misono unsigned long item_off; 245123d0b79dSTomohiro Misono unsigned long item_len; 245223d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 245323d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2454b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 245523d0b79dSTomohiro Misono struct btrfs_path *path; 245623d0b79dSTomohiro Misono struct btrfs_key key, key2; 245723d0b79dSTomohiro Misono struct extent_buffer *leaf; 245823d0b79dSTomohiro Misono struct inode *temp_inode; 245923d0b79dSTomohiro Misono char *ptr; 246023d0b79dSTomohiro Misono int slot; 246123d0b79dSTomohiro Misono int len; 246223d0b79dSTomohiro Misono int total_len = 0; 246323d0b79dSTomohiro Misono int ret; 246423d0b79dSTomohiro Misono 246523d0b79dSTomohiro Misono path = btrfs_alloc_path(); 246623d0b79dSTomohiro Misono if (!path) 246723d0b79dSTomohiro Misono return -ENOMEM; 246823d0b79dSTomohiro Misono 246923d0b79dSTomohiro Misono /* 247023d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 247123d0b79dSTomohiro Misono * construct the path in from the bottom up. 247223d0b79dSTomohiro Misono */ 247323d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 247423d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 247523d0b79dSTomohiro Misono 247656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 247723d0b79dSTomohiro Misono if (IS_ERR(root)) { 247823d0b79dSTomohiro Misono ret = PTR_ERR(root); 247923d0b79dSTomohiro Misono goto out; 248023d0b79dSTomohiro Misono } 248123d0b79dSTomohiro Misono 248223d0b79dSTomohiro Misono key.objectid = dirid; 248323d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 248423d0b79dSTomohiro Misono key.offset = (u64)-1; 248523d0b79dSTomohiro Misono while (1) { 24860ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 24870ff40a91SMarcos Paulo de Souza if (ret < 0) 2488b8a49ae1SJosef Bacik goto out_put; 24890ff40a91SMarcos Paulo de Souza else if (ret > 0) { 249023d0b79dSTomohiro Misono ret = -ENOENT; 2491b8a49ae1SJosef Bacik goto out_put; 249223d0b79dSTomohiro Misono } 249323d0b79dSTomohiro Misono 249423d0b79dSTomohiro Misono leaf = path->nodes[0]; 249523d0b79dSTomohiro Misono slot = path->slots[0]; 249623d0b79dSTomohiro Misono 249723d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 249823d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 249923d0b79dSTomohiro Misono ptr -= len + 1; 250023d0b79dSTomohiro Misono total_len += len + 1; 250123d0b79dSTomohiro Misono if (ptr < args->path) { 250223d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2503b8a49ae1SJosef Bacik goto out_put; 250423d0b79dSTomohiro Misono } 250523d0b79dSTomohiro Misono 250623d0b79dSTomohiro Misono *(ptr + len) = '/'; 250723d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 250823d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 250923d0b79dSTomohiro Misono 251023d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 251123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 251223d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 251323d0b79dSTomohiro Misono if (ret < 0) { 2514b8a49ae1SJosef Bacik goto out_put; 251523d0b79dSTomohiro Misono } else if (ret > 0) { 251623d0b79dSTomohiro Misono ret = -ENOENT; 2517b8a49ae1SJosef Bacik goto out_put; 251823d0b79dSTomohiro Misono } 251923d0b79dSTomohiro Misono 252023d0b79dSTomohiro Misono leaf = path->nodes[0]; 252123d0b79dSTomohiro Misono slot = path->slots[0]; 252223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 252323d0b79dSTomohiro Misono if (key2.objectid != dirid) { 252423d0b79dSTomohiro Misono ret = -ENOENT; 2525b8a49ae1SJosef Bacik goto out_put; 252623d0b79dSTomohiro Misono } 252723d0b79dSTomohiro Misono 25280202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25293ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25303ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2531b8a49ae1SJosef Bacik goto out_put; 25323ca57bd6SMisono Tomohiro } 25336623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 253447291baaSChristian Brauner MAY_READ | MAY_EXEC); 253523d0b79dSTomohiro Misono iput(temp_inode); 253623d0b79dSTomohiro Misono if (ret) { 253723d0b79dSTomohiro Misono ret = -EACCES; 2538b8a49ae1SJosef Bacik goto out_put; 253923d0b79dSTomohiro Misono } 254023d0b79dSTomohiro Misono 254123d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 254223d0b79dSTomohiro Misono break; 254323d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 254423d0b79dSTomohiro Misono ret = -EACCES; 2545b8a49ae1SJosef Bacik goto out_put; 254623d0b79dSTomohiro Misono } 254723d0b79dSTomohiro Misono 254823d0b79dSTomohiro Misono btrfs_release_path(path); 254923d0b79dSTomohiro Misono key.objectid = key.offset; 255023d0b79dSTomohiro Misono key.offset = (u64)-1; 255123d0b79dSTomohiro Misono dirid = key.objectid; 255223d0b79dSTomohiro Misono } 255323d0b79dSTomohiro Misono 255423d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 255523d0b79dSTomohiro Misono args->path[total_len] = '\0'; 255600246528SJosef Bacik btrfs_put_root(root); 2557b8a49ae1SJosef Bacik root = NULL; 255823d0b79dSTomohiro Misono btrfs_release_path(path); 255923d0b79dSTomohiro Misono } 256023d0b79dSTomohiro Misono 256123d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 256223d0b79dSTomohiro Misono key.objectid = treeid; 256323d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 256423d0b79dSTomohiro Misono key.offset = args->treeid; 2565b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 256623d0b79dSTomohiro Misono if (ret < 0) { 256723d0b79dSTomohiro Misono goto out; 256823d0b79dSTomohiro Misono } else if (ret > 0) { 256923d0b79dSTomohiro Misono ret = -ENOENT; 257023d0b79dSTomohiro Misono goto out; 257123d0b79dSTomohiro Misono } 257223d0b79dSTomohiro Misono 257323d0b79dSTomohiro Misono leaf = path->nodes[0]; 257423d0b79dSTomohiro Misono slot = path->slots[0]; 257523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 257623d0b79dSTomohiro Misono 257723d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 257823d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 257923d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 258023d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 258123d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 258223d0b79dSTomohiro Misono ret = -EINVAL; 258323d0b79dSTomohiro Misono goto out; 258423d0b79dSTomohiro Misono } 258523d0b79dSTomohiro Misono 258623d0b79dSTomohiro Misono /* Copy subvolume's name */ 258723d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 258823d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 258923d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 259023d0b79dSTomohiro Misono args->name[item_len] = 0; 259123d0b79dSTomohiro Misono 2592b8a49ae1SJosef Bacik out_put: 259300246528SJosef Bacik btrfs_put_root(root); 259423d0b79dSTomohiro Misono out: 259523d0b79dSTomohiro Misono btrfs_free_path(path); 259623d0b79dSTomohiro Misono return ret; 259723d0b79dSTomohiro Misono } 259823d0b79dSTomohiro Misono 2599ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2600ac8e9819SChris Mason void __user *argp) 2601ac8e9819SChris Mason { 2602ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2603ac8e9819SChris Mason struct inode *inode; 260401b810b8SDavid Sterba int ret = 0; 2605ac8e9819SChris Mason 26062354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26072354d08fSJulia Lawall if (IS_ERR(args)) 26082354d08fSJulia Lawall return PTR_ERR(args); 2609c2b96929SDan Carpenter 2610496ad9aaSAl Viro inode = file_inode(file); 2611ac8e9819SChris Mason 261201b810b8SDavid Sterba /* 261301b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 261401b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 261501b810b8SDavid Sterba */ 26161b53ac4dSChris Mason if (args->treeid == 0) 26171b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26181b53ac4dSChris Mason 261901b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 262001b810b8SDavid Sterba args->name[0] = 0; 262101b810b8SDavid Sterba goto out; 262201b810b8SDavid Sterba } 262301b810b8SDavid Sterba 262401b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 262501b810b8SDavid Sterba ret = -EPERM; 262601b810b8SDavid Sterba goto out; 262701b810b8SDavid Sterba } 262801b810b8SDavid Sterba 2629ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2630ac8e9819SChris Mason args->treeid, args->objectid, 2631ac8e9819SChris Mason args->name); 2632ac8e9819SChris Mason 263301b810b8SDavid Sterba out: 2634ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2635ac8e9819SChris Mason ret = -EFAULT; 2636ac8e9819SChris Mason 2637ac8e9819SChris Mason kfree(args); 263898d377a0STARUISI Hiroaki return ret; 263998d377a0STARUISI Hiroaki } 264098d377a0STARUISI Hiroaki 264123d0b79dSTomohiro Misono /* 264223d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 264323d0b79dSTomohiro Misono * 264423d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 264523d0b79dSTomohiro Misono * 264623d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 264723d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 264823d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 264923d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 265023d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 265123d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 265223d0b79dSTomohiro Misono */ 265323d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 265423d0b79dSTomohiro Misono { 265523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 265623d0b79dSTomohiro Misono struct inode *inode; 265723d0b79dSTomohiro Misono int ret; 265823d0b79dSTomohiro Misono 265923d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 266023d0b79dSTomohiro Misono if (IS_ERR(args)) 266123d0b79dSTomohiro Misono return PTR_ERR(args); 266223d0b79dSTomohiro Misono 266323d0b79dSTomohiro Misono inode = file_inode(file); 266423d0b79dSTomohiro Misono 266523d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 266623d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 266723d0b79dSTomohiro Misono /* 266823d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 266923d0b79dSTomohiro Misono * called 267023d0b79dSTomohiro Misono */ 267123d0b79dSTomohiro Misono kfree(args); 267223d0b79dSTomohiro Misono return -EACCES; 267323d0b79dSTomohiro Misono } 267423d0b79dSTomohiro Misono 26756623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 267623d0b79dSTomohiro Misono 267723d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 267823d0b79dSTomohiro Misono ret = -EFAULT; 267923d0b79dSTomohiro Misono 268023d0b79dSTomohiro Misono kfree(args); 268123d0b79dSTomohiro Misono return ret; 268223d0b79dSTomohiro Misono } 268323d0b79dSTomohiro Misono 2684b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2685b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2686b64ec075STomohiro Misono { 2687b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2688b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2689b64ec075STomohiro Misono struct btrfs_root *root; 2690b64ec075STomohiro Misono struct btrfs_path *path; 2691b64ec075STomohiro Misono struct btrfs_key key; 2692b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2693b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2694b64ec075STomohiro Misono struct extent_buffer *leaf; 2695b64ec075STomohiro Misono unsigned long item_off; 2696b64ec075STomohiro Misono unsigned long item_len; 2697b64ec075STomohiro Misono struct inode *inode; 2698b64ec075STomohiro Misono int slot; 2699b64ec075STomohiro Misono int ret = 0; 2700b64ec075STomohiro Misono 2701b64ec075STomohiro Misono path = btrfs_alloc_path(); 2702b64ec075STomohiro Misono if (!path) 2703b64ec075STomohiro Misono return -ENOMEM; 2704b64ec075STomohiro Misono 2705b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2706b64ec075STomohiro Misono if (!subvol_info) { 2707b64ec075STomohiro Misono btrfs_free_path(path); 2708b64ec075STomohiro Misono return -ENOMEM; 2709b64ec075STomohiro Misono } 2710b64ec075STomohiro Misono 2711b64ec075STomohiro Misono inode = file_inode(file); 2712b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2713b64ec075STomohiro Misono 2714b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2715b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 271656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2717b64ec075STomohiro Misono if (IS_ERR(root)) { 2718b64ec075STomohiro Misono ret = PTR_ERR(root); 271904734e84SJosef Bacik goto out_free; 272004734e84SJosef Bacik } 2721b64ec075STomohiro Misono root_item = &root->root_item; 2722b64ec075STomohiro Misono 2723b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2724b64ec075STomohiro Misono 2725b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2726b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2727b64ec075STomohiro Misono 2728b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2729b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2730b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2731b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2732b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2733b64ec075STomohiro Misono 2734b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2735b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2736b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2737b64ec075STomohiro Misono 2738b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2739b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2740b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2741b64ec075STomohiro Misono 2742b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2743b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2744b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2745b64ec075STomohiro Misono 2746b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2747b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2748b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2749b64ec075STomohiro Misono 2750b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2751b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2752b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2753b64ec075STomohiro Misono key.offset = 0; 275404734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2755b64ec075STomohiro Misono if (ret < 0) { 2756b64ec075STomohiro Misono goto out; 2757b64ec075STomohiro Misono } else if (path->slots[0] >= 2758b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 275904734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2760b64ec075STomohiro Misono if (ret < 0) { 2761b64ec075STomohiro Misono goto out; 2762b64ec075STomohiro Misono } else if (ret > 0) { 2763b64ec075STomohiro Misono ret = -EUCLEAN; 2764b64ec075STomohiro Misono goto out; 2765b64ec075STomohiro Misono } 2766b64ec075STomohiro Misono } 2767b64ec075STomohiro Misono 2768b64ec075STomohiro Misono leaf = path->nodes[0]; 2769b64ec075STomohiro Misono slot = path->slots[0]; 2770b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2771b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2772b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2773b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2774b64ec075STomohiro Misono 2775b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2776b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2777b64ec075STomohiro Misono 2778b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2779b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2780b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2781b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2782b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2783b64ec075STomohiro Misono item_off, item_len); 2784b64ec075STomohiro Misono } else { 2785b64ec075STomohiro Misono ret = -ENOENT; 2786b64ec075STomohiro Misono goto out; 2787b64ec075STomohiro Misono } 2788b64ec075STomohiro Misono } 2789b64ec075STomohiro Misono 2790b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2791b64ec075STomohiro Misono ret = -EFAULT; 2792b64ec075STomohiro Misono 2793b64ec075STomohiro Misono out: 279400246528SJosef Bacik btrfs_put_root(root); 279504734e84SJosef Bacik out_free: 2796b64ec075STomohiro Misono btrfs_free_path(path); 2797b091f7feSWaiman Long kfree(subvol_info); 2798b64ec075STomohiro Misono return ret; 2799b64ec075STomohiro Misono } 2800b64ec075STomohiro Misono 280142e4b520STomohiro Misono /* 280242e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 280342e4b520STomohiro Misono * except the subvolume name. 280442e4b520STomohiro Misono */ 280542e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 280642e4b520STomohiro Misono { 280742e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 280842e4b520STomohiro Misono struct btrfs_root_ref *rref; 280942e4b520STomohiro Misono struct btrfs_root *root; 281042e4b520STomohiro Misono struct btrfs_path *path; 281142e4b520STomohiro Misono struct btrfs_key key; 281242e4b520STomohiro Misono struct extent_buffer *leaf; 281342e4b520STomohiro Misono struct inode *inode; 281442e4b520STomohiro Misono u64 objectid; 281542e4b520STomohiro Misono int slot; 281642e4b520STomohiro Misono int ret; 281742e4b520STomohiro Misono u8 found; 281842e4b520STomohiro Misono 281942e4b520STomohiro Misono path = btrfs_alloc_path(); 282042e4b520STomohiro Misono if (!path) 282142e4b520STomohiro Misono return -ENOMEM; 282242e4b520STomohiro Misono 282342e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 282442e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 282542e4b520STomohiro Misono btrfs_free_path(path); 282642e4b520STomohiro Misono return PTR_ERR(rootrefs); 282742e4b520STomohiro Misono } 282842e4b520STomohiro Misono 282942e4b520STomohiro Misono inode = file_inode(file); 283042e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 283142e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 283242e4b520STomohiro Misono 283342e4b520STomohiro Misono key.objectid = objectid; 283442e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 283542e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 283642e4b520STomohiro Misono found = 0; 283742e4b520STomohiro Misono 283842e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 283942e4b520STomohiro Misono if (ret < 0) { 284042e4b520STomohiro Misono goto out; 284142e4b520STomohiro Misono } else if (path->slots[0] >= 284242e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 284342e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 284442e4b520STomohiro Misono if (ret < 0) { 284542e4b520STomohiro Misono goto out; 284642e4b520STomohiro Misono } else if (ret > 0) { 284742e4b520STomohiro Misono ret = -EUCLEAN; 284842e4b520STomohiro Misono goto out; 284942e4b520STomohiro Misono } 285042e4b520STomohiro Misono } 285142e4b520STomohiro Misono while (1) { 285242e4b520STomohiro Misono leaf = path->nodes[0]; 285342e4b520STomohiro Misono slot = path->slots[0]; 285442e4b520STomohiro Misono 285542e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 285642e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 285742e4b520STomohiro Misono ret = 0; 285842e4b520STomohiro Misono goto out; 285942e4b520STomohiro Misono } 286042e4b520STomohiro Misono 286142e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 286242e4b520STomohiro Misono ret = -EOVERFLOW; 286342e4b520STomohiro Misono goto out; 286442e4b520STomohiro Misono } 286542e4b520STomohiro Misono 286642e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 286742e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 286842e4b520STomohiro Misono rootrefs->rootref[found].dirid = 286942e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 287042e4b520STomohiro Misono found++; 287142e4b520STomohiro Misono 287242e4b520STomohiro Misono ret = btrfs_next_item(root, path); 287342e4b520STomohiro Misono if (ret < 0) { 287442e4b520STomohiro Misono goto out; 287542e4b520STomohiro Misono } else if (ret > 0) { 287642e4b520STomohiro Misono ret = -EUCLEAN; 287742e4b520STomohiro Misono goto out; 287842e4b520STomohiro Misono } 287942e4b520STomohiro Misono } 288042e4b520STomohiro Misono 288142e4b520STomohiro Misono out: 288242e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 288342e4b520STomohiro Misono rootrefs->num_items = found; 288442e4b520STomohiro Misono /* update min_treeid for next search */ 288542e4b520STomohiro Misono if (found) 288642e4b520STomohiro Misono rootrefs->min_treeid = 288742e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 288842e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 288942e4b520STomohiro Misono ret = -EFAULT; 289042e4b520STomohiro Misono } 289142e4b520STomohiro Misono 289242e4b520STomohiro Misono kfree(rootrefs); 289342e4b520STomohiro Misono btrfs_free_path(path); 289442e4b520STomohiro Misono 289542e4b520STomohiro Misono return ret; 289642e4b520STomohiro Misono } 289742e4b520STomohiro Misono 289876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2899949964c9SMarcos Paulo de Souza void __user *arg, 2900949964c9SMarcos Paulo de Souza bool destroy_v2) 290176dda93cSYan, Zheng { 290254563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29030b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 290476dda93cSYan, Zheng struct dentry *dentry; 29052b0143b5SDavid Howells struct inode *dir = d_inode(parent); 290676dda93cSYan, Zheng struct inode *inode; 290776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 290876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2909949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2910949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2911c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 2912949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2913949964c9SMarcos Paulo de Souza int subvol_namelen; 291476dda93cSYan, Zheng int err = 0; 2915949964c9SMarcos Paulo de Souza bool destroy_parent = false; 291676dda93cSYan, Zheng 2917949964c9SMarcos Paulo de Souza if (destroy_v2) { 2918949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2919949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2920949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2921325c50e3SJeff Mahoney 2922949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2923949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2924949964c9SMarcos Paulo de Souza goto out; 2925949964c9SMarcos Paulo de Souza } 292676dda93cSYan, Zheng 2927949964c9SMarcos Paulo de Souza /* 2928949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2929949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2930949964c9SMarcos Paulo de Souza */ 2931949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2932949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2933949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2934949964c9SMarcos Paulo de Souza 2935949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2936949964c9SMarcos Paulo de Souza if (err) 2937949964c9SMarcos Paulo de Souza goto out; 2938949964c9SMarcos Paulo de Souza } else { 2939aabb34e7SChristian Brauner struct inode *old_dir; 2940c4ed533bSChristian Brauner 2941949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 294276dda93cSYan, Zheng err = -EINVAL; 294376dda93cSYan, Zheng goto out; 294476dda93cSYan, Zheng } 294576dda93cSYan, Zheng 2946a561be71SAl Viro err = mnt_want_write_file(file); 294776dda93cSYan, Zheng if (err) 294876dda93cSYan, Zheng goto out; 294976dda93cSYan, Zheng 2950949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2951949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2952949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2953949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2954949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2955949964c9SMarcos Paulo de Souza goto out_drop_write; 2956949964c9SMarcos Paulo de Souza } 2957949964c9SMarcos Paulo de Souza 2958949964c9SMarcos Paulo de Souza /* 2959949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2960949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2961949964c9SMarcos Paulo de Souza */ 2962949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2963949964c9SMarcos Paulo de Souza 2964949964c9SMarcos Paulo de Souza /* 2965949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2966949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2967949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2968949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2969949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2970949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2971949964c9SMarcos Paulo de Souza */ 2972949964c9SMarcos Paulo de Souza dput(dentry); 2973949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2974949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2975949964c9SMarcos Paulo de Souza goto out_drop_write; 2976949964c9SMarcos Paulo de Souza } 2977aabb34e7SChristian Brauner old_dir = dir; 2978949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2979949964c9SMarcos Paulo de Souza 2980949964c9SMarcos Paulo de Souza /* 2981949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2982949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2983949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2984949964c9SMarcos Paulo de Souza * new parent dentry. 2985949964c9SMarcos Paulo de Souza */ 2986949964c9SMarcos Paulo de Souza destroy_parent = true; 2987949964c9SMarcos Paulo de Souza 2988aabb34e7SChristian Brauner /* 2989aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 2990aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 2991aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 2992aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 2993aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 2994aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 2995aabb34e7SChristian Brauner * to delete without an idmapped mount. 2996aabb34e7SChristian Brauner */ 2997aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 2998aabb34e7SChristian Brauner err = -EOPNOTSUPP; 2999aabb34e7SChristian Brauner goto free_parent; 3000aabb34e7SChristian Brauner } 3001aabb34e7SChristian Brauner 3002949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3003949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3004949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3005949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3006949964c9SMarcos Paulo de Souza goto free_parent; 3007949964c9SMarcos Paulo de Souza } 30081a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3009949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3010949964c9SMarcos Paulo de Souza } 3011949964c9SMarcos Paulo de Souza } else { 3012949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3013949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3014949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3015949964c9SMarcos Paulo de Souza 3016949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3017949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3018949964c9SMarcos Paulo de Souza 3019949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3020949964c9SMarcos Paulo de Souza if (err) 3021949964c9SMarcos Paulo de Souza goto out; 3022949964c9SMarcos Paulo de Souza } 3023949964c9SMarcos Paulo de Souza 3024949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3025949964c9SMarcos Paulo de Souza 3026949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3027949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3028949964c9SMarcos Paulo de Souza err = -EINVAL; 3029949964c9SMarcos Paulo de Souza goto free_subvol_name; 3030949964c9SMarcos Paulo de Souza } 3031949964c9SMarcos Paulo de Souza 3032949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3033949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3034949964c9SMarcos Paulo de Souza goto free_subvol_name; 3035949964c9SMarcos Paulo de Souza } 3036521e0546SDavid Sterba 303700235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 303800235411SAl Viro if (err == -EINTR) 3039949964c9SMarcos Paulo de Souza goto free_subvol_name; 3040c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 304176dda93cSYan, Zheng if (IS_ERR(dentry)) { 304276dda93cSYan, Zheng err = PTR_ERR(dentry); 304376dda93cSYan, Zheng goto out_unlock_dir; 304476dda93cSYan, Zheng } 304576dda93cSYan, Zheng 30462b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 304776dda93cSYan, Zheng err = -ENOENT; 304876dda93cSYan, Zheng goto out_dput; 304976dda93cSYan, Zheng } 305076dda93cSYan, Zheng 30512b0143b5SDavid Howells inode = d_inode(dentry); 30524260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30534260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30544260f7c7SSage Weil /* 30554260f7c7SSage Weil * Regular user. Only allow this with a special mount 30564260f7c7SSage Weil * option, when the user has write+exec access to the 30574260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30584260f7c7SSage Weil * allowed. 30594260f7c7SSage Weil * 30604260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30614260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30624260f7c7SSage Weil * otherwise be able to delete. 30634260f7c7SSage Weil * 30644260f7c7SSage Weil * Users who want to delete empty subvols should try 30654260f7c7SSage Weil * rmdir(2). 30664260f7c7SSage Weil */ 30674260f7c7SSage Weil err = -EPERM; 30680b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30694260f7c7SSage Weil goto out_dput; 30704260f7c7SSage Weil 30714260f7c7SSage Weil /* 30724260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30734260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30744260f7c7SSage Weil * must be called on the dentry referencing the root 30754260f7c7SSage Weil * of the subvol, not a random directory contained 30764260f7c7SSage Weil * within it. 30774260f7c7SSage Weil */ 30784260f7c7SSage Weil err = -EINVAL; 30794260f7c7SSage Weil if (root == dest) 30804260f7c7SSage Weil goto out_dput; 30814260f7c7SSage Weil 3082c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 30834260f7c7SSage Weil if (err) 30844260f7c7SSage Weil goto out_dput; 30855c39da5bSMiao Xie } 30864260f7c7SSage Weil 30875c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3088c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 30894260f7c7SSage Weil if (err) 30904260f7c7SSage Weil goto out_dput; 30914260f7c7SSage Weil 30924a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 309376dda93cSYan, Zheng err = -EINVAL; 309476dda93cSYan, Zheng goto out_dput; 309576dda93cSYan, Zheng } 309676dda93cSYan, Zheng 309764708539SJosef Bacik btrfs_inode_lock(inode, 0); 3098f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 309964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 310046008d9dSAmir Goldstein if (!err) { 310146008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 310276dda93cSYan, Zheng d_delete(dentry); 310346008d9dSAmir Goldstein } 3104fa6ac876SLiu Bo 310576dda93cSYan, Zheng out_dput: 310676dda93cSYan, Zheng dput(dentry); 310776dda93cSYan, Zheng out_unlock_dir: 310864708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3109949964c9SMarcos Paulo de Souza free_subvol_name: 3110949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3111949964c9SMarcos Paulo de Souza free_parent: 3112949964c9SMarcos Paulo de Souza if (destroy_parent) 3113949964c9SMarcos Paulo de Souza dput(parent); 311400235411SAl Viro out_drop_write: 31152a79f17eSAl Viro mnt_drop_write_file(file); 311676dda93cSYan, Zheng out: 3117949964c9SMarcos Paulo de Souza kfree(vol_args2); 311876dda93cSYan, Zheng kfree(vol_args); 311976dda93cSYan, Zheng return err; 312076dda93cSYan, Zheng } 312176dda93cSYan, Zheng 31221e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3123f46b5a66SChristoph Hellwig { 3124496ad9aaSAl Viro struct inode *inode = file_inode(file); 3125f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3126c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3127c146afadSYan Zheng int ret; 3128c146afadSYan Zheng 312925122d15SIlya Dryomov ret = mnt_want_write_file(file); 313025122d15SIlya Dryomov if (ret) 313125122d15SIlya Dryomov return ret; 3132b83cc969SLi Zefan 313325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 313425122d15SIlya Dryomov ret = -EROFS; 313525122d15SIlya Dryomov goto out; 31365ac00addSStefan Behrens } 3137f46b5a66SChristoph Hellwig 313895ea0486SQu Wenruo /* Subpage defrag will be supported in later commits */ 313995ea0486SQu Wenruo if (root->fs_info->sectorsize < PAGE_SIZE) { 314095ea0486SQu Wenruo ret = -ENOTTY; 314195ea0486SQu Wenruo goto out; 314295ea0486SQu Wenruo } 314395ea0486SQu Wenruo 3144f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3145f46b5a66SChristoph Hellwig case S_IFDIR: 3146e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3147e441d54dSChris Mason ret = -EPERM; 3148e441d54dSChris Mason goto out; 3149e441d54dSChris Mason } 3150de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3151f46b5a66SChristoph Hellwig break; 3152f46b5a66SChristoph Hellwig case S_IFREG: 3153616d374eSAdam Borowski /* 3154616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3155616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3156616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3157616d374eSAdam Borowski */ 3158616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 315947291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3160616d374eSAdam Borowski ret = -EPERM; 3161e441d54dSChris Mason goto out; 3162e441d54dSChris Mason } 31631e701a32SChris Mason 31641e701a32SChris Mason if (argp) { 3165c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 31661e701a32SChris Mason ret = -EFAULT; 3167683be16eSDan Carpenter goto out; 31681e701a32SChris Mason } 31691e701a32SChris Mason /* compression requires us to start the IO */ 3170c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3171c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3172c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 31731e701a32SChris Mason } 31741e701a32SChris Mason } else { 31751e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3176c853a578SGoldwyn Rodrigues range.len = (u64)-1; 31771e701a32SChris Mason } 3178496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 3179c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 31804cb5300bSChris Mason if (ret > 0) 31814cb5300bSChris Mason ret = 0; 3182f46b5a66SChristoph Hellwig break; 31838929ecfaSYan, Zheng default: 31848929ecfaSYan, Zheng ret = -EINVAL; 3185f46b5a66SChristoph Hellwig } 3186e441d54dSChris Mason out: 318725122d15SIlya Dryomov mnt_drop_write_file(file); 3188e441d54dSChris Mason return ret; 3189f46b5a66SChristoph Hellwig } 3190f46b5a66SChristoph Hellwig 31912ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3192f46b5a66SChristoph Hellwig { 3193f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3194f46b5a66SChristoph Hellwig int ret; 3195f46b5a66SChristoph Hellwig 3196e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3197e441d54dSChris Mason return -EPERM; 3198e441d54dSChris Mason 3199c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3200e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3201c9e9f97bSIlya Dryomov 3202dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3203c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3204c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3205c9e9f97bSIlya Dryomov goto out; 3206c9e9f97bSIlya Dryomov } 3207f46b5a66SChristoph Hellwig 32085516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32092ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3210f46b5a66SChristoph Hellwig 321143d20761SAnand Jain if (!ret) 32120b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 321343d20761SAnand Jain 3214f46b5a66SChristoph Hellwig kfree(vol_args); 3215c9e9f97bSIlya Dryomov out: 3216c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3217f46b5a66SChristoph Hellwig return ret; 3218f46b5a66SChristoph Hellwig } 3219f46b5a66SChristoph Hellwig 32206b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3221f46b5a66SChristoph Hellwig { 32220b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32246b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 32253fa421deSJosef Bacik struct block_device *bdev = NULL; 32263fa421deSJosef Bacik fmode_t mode; 3227f46b5a66SChristoph Hellwig int ret; 322867ae34b6SDavid Sterba bool cancel = false; 3229f46b5a66SChristoph Hellwig 3230e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3231e441d54dSChris Mason return -EPERM; 3232e441d54dSChris Mason 3233da24927bSMiao Xie ret = mnt_want_write_file(file); 3234da24927bSMiao Xie if (ret) 3235da24927bSMiao Xie return ret; 3236c146afadSYan Zheng 3237dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3238c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3239c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3240c47ca32dSDan Carpenter goto err_drop; 3241c9e9f97bSIlya Dryomov } 3242f46b5a66SChristoph Hellwig 3243748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3244fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3245fd4e994bSOmar Sandoval goto out; 3246fd4e994bSOmar Sandoval } 32476b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 324867ae34b6SDavid Sterba if (!(vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) && 324967ae34b6SDavid Sterba strcmp("cancel", vol_args->name) == 0) 325067ae34b6SDavid Sterba cancel = true; 325167ae34b6SDavid Sterba 325267ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 325367ae34b6SDavid Sterba cancel); 325467ae34b6SDavid Sterba if (ret) 325567ae34b6SDavid Sterba goto out; 325667ae34b6SDavid Sterba /* Exclusive operation is now claimed */ 325767ae34b6SDavid Sterba 325867ae34b6SDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32593fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, NULL, vol_args->devid, &bdev, &mode); 326067ae34b6SDavid Sterba else 32613fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); 326267ae34b6SDavid Sterba 3263c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3264183860f6SAnand Jain 32656b526ed7SAnand Jain if (!ret) { 3266735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32670b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32686b526ed7SAnand Jain vol_args->devid); 32696b526ed7SAnand Jain else 32700b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32716b526ed7SAnand Jain vol_args->name); 32726b526ed7SAnand Jain } 3273183860f6SAnand Jain out: 3274183860f6SAnand Jain kfree(vol_args); 3275c47ca32dSDan Carpenter err_drop: 32764ac20c70SIlya Dryomov mnt_drop_write_file(file); 32773fa421deSJosef Bacik if (bdev) 32783fa421deSJosef Bacik blkdev_put(bdev, mode); 3279f46b5a66SChristoph Hellwig return ret; 3280f46b5a66SChristoph Hellwig } 3281f46b5a66SChristoph Hellwig 3282f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3283f46b5a66SChristoph Hellwig { 32840b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3286f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 32873fa421deSJosef Bacik struct block_device *bdev = NULL; 32883fa421deSJosef Bacik fmode_t mode; 3289f46b5a66SChristoph Hellwig int ret; 329067ae34b6SDavid Sterba bool cancel; 3291f46b5a66SChristoph Hellwig 3292f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3293f46b5a66SChristoph Hellwig return -EPERM; 3294f46b5a66SChristoph Hellwig 3295f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3296f46b5a66SChristoph Hellwig if (ret) 3297f46b5a66SChristoph Hellwig return ret; 3298f46b5a66SChristoph Hellwig 329958d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 330058d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 330158d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 330267ae34b6SDavid Sterba goto out_drop_write; 3303f46b5a66SChristoph Hellwig } 330458d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 330567ae34b6SDavid Sterba cancel = (strcmp("cancel", vol_args->name) == 0); 3306f46b5a66SChristoph Hellwig 330767ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 330867ae34b6SDavid Sterba cancel); 330967ae34b6SDavid Sterba if (ret == 0) { 33103fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); 3311f46b5a66SChristoph Hellwig if (!ret) 33120b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3313c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 331467ae34b6SDavid Sterba } 331567ae34b6SDavid Sterba 331667ae34b6SDavid Sterba kfree(vol_args); 331758d7bbf8SDavid Sterba out_drop_write: 3318f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 33193fa421deSJosef Bacik if (bdev) 33203fa421deSJosef Bacik blkdev_put(bdev, mode); 3321f46b5a66SChristoph Hellwig return ret; 3322f46b5a66SChristoph Hellwig } 3323f46b5a66SChristoph Hellwig 33242ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33252ff7e61eSJeff Mahoney void __user *arg) 3326475f6387SJan Schmidt { 3327027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3328475f6387SJan Schmidt struct btrfs_device *device; 33290b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3330137c5418SJohannes Thumshirn u64 flags_in; 3331027ed2f0SLi Zefan int ret = 0; 3332475f6387SJan Schmidt 3333137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3334137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3335137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3336137c5418SJohannes Thumshirn 3337137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3338137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3339027ed2f0SLi Zefan 3340d03262c7SDavid Sterba rcu_read_lock(); 3341027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3342475f6387SJan Schmidt 3343d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3344027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3345027ed2f0SLi Zefan fi_args->max_id = device->devid; 3346475f6387SJan Schmidt } 3347d03262c7SDavid Sterba rcu_read_unlock(); 3348475f6387SJan Schmidt 3349de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3350bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3351bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3352bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 335380a773fbSDavid Sterba 3354137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3355137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3356137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3357137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3358137c5418SJohannes Thumshirn } 3359137c5418SJohannes Thumshirn 33600fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33610fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33620fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33630fb408a5SJohannes Thumshirn } 33640fb408a5SJohannes Thumshirn 336549bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 336649bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 336749bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 336849bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 336949bac897SJohannes Thumshirn } 337049bac897SJohannes Thumshirn 3371027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3372027ed2f0SLi Zefan ret = -EFAULT; 3373475f6387SJan Schmidt 3374027ed2f0SLi Zefan kfree(fi_args); 3375027ed2f0SLi Zefan return ret; 3376475f6387SJan Schmidt } 3377475f6387SJan Schmidt 33782ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33792ff7e61eSJeff Mahoney void __user *arg) 3380475f6387SJan Schmidt { 3381475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3382475f6387SJan Schmidt struct btrfs_device *dev; 3383475f6387SJan Schmidt int ret = 0; 3384475f6387SJan Schmidt char *s_uuid = NULL; 3385475f6387SJan Schmidt 3386475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3387475f6387SJan Schmidt if (IS_ERR(di_args)) 3388475f6387SJan Schmidt return PTR_ERR(di_args); 3389475f6387SJan Schmidt 3390dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3391475f6387SJan Schmidt s_uuid = di_args->uuid; 3392475f6387SJan Schmidt 3393c5593ca3SDavid Sterba rcu_read_lock(); 3394e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3395b2598edfSAnand Jain NULL); 3396475f6387SJan Schmidt 3397475f6387SJan Schmidt if (!dev) { 3398475f6387SJan Schmidt ret = -ENODEV; 3399475f6387SJan Schmidt goto out; 3400475f6387SJan Schmidt } 3401475f6387SJan Schmidt 3402475f6387SJan Schmidt di_args->devid = dev->devid; 34037cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 34047cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3405475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3406a27202fbSJim Meyering if (dev->name) { 3407672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3408672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3409a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3410a27202fbSJim Meyering } else { 341199ba55adSStefan Behrens di_args->path[0] = '\0'; 3412a27202fbSJim Meyering } 3413475f6387SJan Schmidt 3414475f6387SJan Schmidt out: 3415c5593ca3SDavid Sterba rcu_read_unlock(); 3416475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3417475f6387SJan Schmidt ret = -EFAULT; 3418475f6387SJan Schmidt 3419475f6387SJan Schmidt kfree(di_args); 3420475f6387SJan Schmidt return ret; 3421475f6387SJan Schmidt } 3422475f6387SJan Schmidt 34236ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34246ef5ed0dSJosef Bacik { 3425496ad9aaSAl Viro struct inode *inode = file_inode(file); 34260b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34276ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34286ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34296ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34306ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34312a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34326ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34336ef5ed0dSJosef Bacik u64 objectid = 0; 34346ef5ed0dSJosef Bacik u64 dir_id; 34353c04ce01SMiao Xie int ret; 34366ef5ed0dSJosef Bacik 34376ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34386ef5ed0dSJosef Bacik return -EPERM; 34396ef5ed0dSJosef Bacik 34403c04ce01SMiao Xie ret = mnt_want_write_file(file); 34413c04ce01SMiao Xie if (ret) 34423c04ce01SMiao Xie return ret; 34433c04ce01SMiao Xie 34443c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34453c04ce01SMiao Xie ret = -EFAULT; 34463c04ce01SMiao Xie goto out; 34473c04ce01SMiao Xie } 34486ef5ed0dSJosef Bacik 34496ef5ed0dSJosef Bacik if (!objectid) 34501cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34516ef5ed0dSJosef Bacik 345256e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34533c04ce01SMiao Xie if (IS_ERR(new_root)) { 34543c04ce01SMiao Xie ret = PTR_ERR(new_root); 34553c04ce01SMiao Xie goto out; 34563c04ce01SMiao Xie } 34572a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34582a2b5d62SJosef Bacik ret = -ENOENT; 34592a2b5d62SJosef Bacik goto out_free; 34602a2b5d62SJosef Bacik } 34616ef5ed0dSJosef Bacik 34626ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34633c04ce01SMiao Xie if (!path) { 34643c04ce01SMiao Xie ret = -ENOMEM; 34652a2b5d62SJosef Bacik goto out_free; 34663c04ce01SMiao Xie } 34676ef5ed0dSJosef Bacik 34686ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 346998d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34703c04ce01SMiao Xie ret = PTR_ERR(trans); 34712a2b5d62SJosef Bacik goto out_free; 34726ef5ed0dSJosef Bacik } 34736ef5ed0dSJosef Bacik 34740b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34750b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34766ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3477cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34782a2b5d62SJosef Bacik btrfs_release_path(path); 34793a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34800b246afaSJeff Mahoney btrfs_err(fs_info, 34815d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34823c04ce01SMiao Xie ret = -ENOENT; 34832a2b5d62SJosef Bacik goto out_free; 34846ef5ed0dSJosef Bacik } 34856ef5ed0dSJosef Bacik 34866ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34876ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34886ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34892a2b5d62SJosef Bacik btrfs_release_path(path); 34906ef5ed0dSJosef Bacik 34910b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34923a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34932a2b5d62SJosef Bacik out_free: 349400246528SJosef Bacik btrfs_put_root(new_root); 34952a2b5d62SJosef Bacik btrfs_free_path(path); 34963c04ce01SMiao Xie out: 34973c04ce01SMiao Xie mnt_drop_write_file(file); 34983c04ce01SMiao Xie return ret; 34996ef5ed0dSJosef Bacik } 35006ef5ed0dSJosef Bacik 3501c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3502bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3503bf5fc093SJosef Bacik { 350432da5386SDavid Sterba struct btrfs_block_group *block_group; 3505bf5fc093SJosef Bacik 3506bf5fc093SJosef Bacik space->total_bytes = 0; 3507bf5fc093SJosef Bacik space->used_bytes = 0; 3508bf5fc093SJosef Bacik space->flags = 0; 3509bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3510bf5fc093SJosef Bacik space->flags = block_group->flags; 3511b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3512bf38be65SDavid Sterba space->used_bytes += block_group->used; 3513bf5fc093SJosef Bacik } 3514bf5fc093SJosef Bacik } 3515bf5fc093SJosef Bacik 35162ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 35172ff7e61eSJeff Mahoney void __user *arg) 35181406e432SJosef Bacik { 35191406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35201406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35211406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35227fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 352313f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35241406e432SJosef Bacik struct btrfs_space_info *info; 3525315d8e98SColin Ian King static const u64 types[] = { 3526315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3527bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3528bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3529315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3530315d8e98SColin Ian King }; 3531bf5fc093SJosef Bacik int num_types = 4; 35327fde62bfSChris Mason int alloc_size; 35331406e432SJosef Bacik int ret = 0; 353451788b1bSDan Rosenberg u64 slot_count = 0; 3535bf5fc093SJosef Bacik int i, c; 35361406e432SJosef Bacik 35371406e432SJosef Bacik if (copy_from_user(&space_args, 35381406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35391406e432SJosef Bacik sizeof(space_args))) 35401406e432SJosef Bacik return -EFAULT; 35411406e432SJosef Bacik 3542bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3543bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3544bf5fc093SJosef Bacik 3545bf5fc093SJosef Bacik info = NULL; 354672804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3547bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3548bf5fc093SJosef Bacik info = tmp; 3549bf5fc093SJosef Bacik break; 3550bf5fc093SJosef Bacik } 3551bf5fc093SJosef Bacik } 35521406e432SJosef Bacik 3553bf5fc093SJosef Bacik if (!info) 3554bf5fc093SJosef Bacik continue; 3555bf5fc093SJosef Bacik 3556bf5fc093SJosef Bacik down_read(&info->groups_sem); 3557bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3558bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3559bf5fc093SJosef Bacik slot_count++; 3560bf5fc093SJosef Bacik } 3561bf5fc093SJosef Bacik up_read(&info->groups_sem); 3562bf5fc093SJosef Bacik } 3563bf5fc093SJosef Bacik 356436523e95SDavid Sterba /* 356536523e95SDavid Sterba * Global block reserve, exported as a space_info 356636523e95SDavid Sterba */ 356736523e95SDavid Sterba slot_count++; 356836523e95SDavid Sterba 35697fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35707fde62bfSChris Mason if (space_args.space_slots == 0) { 35717fde62bfSChris Mason space_args.total_spaces = slot_count; 35727fde62bfSChris Mason goto out; 35737fde62bfSChris Mason } 3574bf5fc093SJosef Bacik 357551788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3576bf5fc093SJosef Bacik 35777fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3578bf5fc093SJosef Bacik 35797fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35807fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35817fde62bfSChris Mason */ 358209cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35837fde62bfSChris Mason return -ENOMEM; 35847fde62bfSChris Mason 35857fde62bfSChris Mason space_args.total_spaces = 0; 35868d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35877fde62bfSChris Mason if (!dest) 35887fde62bfSChris Mason return -ENOMEM; 35897fde62bfSChris Mason dest_orig = dest; 35907fde62bfSChris Mason 35917fde62bfSChris Mason /* now we have a buffer to copy into */ 3592bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3593bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3594bf5fc093SJosef Bacik 359551788b1bSDan Rosenberg if (!slot_count) 359651788b1bSDan Rosenberg break; 359751788b1bSDan Rosenberg 3598bf5fc093SJosef Bacik info = NULL; 359972804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3600bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3601bf5fc093SJosef Bacik info = tmp; 36027fde62bfSChris Mason break; 3603bf5fc093SJosef Bacik } 3604bf5fc093SJosef Bacik } 36057fde62bfSChris Mason 3606bf5fc093SJosef Bacik if (!info) 3607bf5fc093SJosef Bacik continue; 3608bf5fc093SJosef Bacik down_read(&info->groups_sem); 3609bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3610bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3611c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3612c065f5b1SSu Yue &space); 36137fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36141406e432SJosef Bacik dest++; 36151406e432SJosef Bacik space_args.total_spaces++; 361651788b1bSDan Rosenberg slot_count--; 36171406e432SJosef Bacik } 361851788b1bSDan Rosenberg if (!slot_count) 361951788b1bSDan Rosenberg break; 3620bf5fc093SJosef Bacik } 3621bf5fc093SJosef Bacik up_read(&info->groups_sem); 3622bf5fc093SJosef Bacik } 36231406e432SJosef Bacik 362436523e95SDavid Sterba /* 362536523e95SDavid Sterba * Add global block reserve 362636523e95SDavid Sterba */ 362736523e95SDavid Sterba if (slot_count) { 36280b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 362936523e95SDavid Sterba 363036523e95SDavid Sterba spin_lock(&block_rsv->lock); 363136523e95SDavid Sterba space.total_bytes = block_rsv->size; 363236523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 363336523e95SDavid Sterba spin_unlock(&block_rsv->lock); 363436523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 363536523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 363636523e95SDavid Sterba space_args.total_spaces++; 363736523e95SDavid Sterba } 363836523e95SDavid Sterba 36392eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36407fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36417fde62bfSChris Mason 36427fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36437fde62bfSChris Mason ret = -EFAULT; 36447fde62bfSChris Mason 36457fde62bfSChris Mason kfree(dest_orig); 36467fde62bfSChris Mason out: 36477fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36481406e432SJosef Bacik ret = -EFAULT; 36491406e432SJosef Bacik 36501406e432SJosef Bacik return ret; 36511406e432SJosef Bacik } 36521406e432SJosef Bacik 36539a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36549a8c28beSMiao Xie void __user *argp) 365546204592SSage Weil { 365646204592SSage Weil struct btrfs_trans_handle *trans; 365746204592SSage Weil u64 transid; 3658db5b493aSTsutomu Itoh int ret; 365946204592SSage Weil 3660d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3661ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3662ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 366398d5dc13STsutomu Itoh return PTR_ERR(trans); 3664ff7c1d33SMiao Xie 3665ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3666ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3667ff7c1d33SMiao Xie goto out; 3668ff7c1d33SMiao Xie } 366946204592SSage Weil transid = trans->transid; 367032cc4f87SDavid Sterba ret = btrfs_commit_transaction_async(trans); 36718b2b2d3cSTsutomu Itoh if (ret) { 36723a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3673db5b493aSTsutomu Itoh return ret; 36748b2b2d3cSTsutomu Itoh } 3675ff7c1d33SMiao Xie out: 367646204592SSage Weil if (argp) 367746204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 367846204592SSage Weil return -EFAULT; 367946204592SSage Weil return 0; 368046204592SSage Weil } 368146204592SSage Weil 36822ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36839a8c28beSMiao Xie void __user *argp) 368446204592SSage Weil { 368546204592SSage Weil u64 transid; 368646204592SSage Weil 368746204592SSage Weil if (argp) { 368846204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 368946204592SSage Weil return -EFAULT; 369046204592SSage Weil } else { 369146204592SSage Weil transid = 0; /* current trans */ 369246204592SSage Weil } 36932ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 369446204592SSage Weil } 369546204592SSage Weil 3696b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3697475f6387SJan Schmidt { 36980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3699475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3700b8e95489SMiao Xie int ret; 3701475f6387SJan Schmidt 3702475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3703475f6387SJan Schmidt return -EPERM; 3704475f6387SJan Schmidt 3705475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3706475f6387SJan Schmidt if (IS_ERR(sa)) 3707475f6387SJan Schmidt return PTR_ERR(sa); 3708475f6387SJan Schmidt 3709b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3710b8e95489SMiao Xie ret = mnt_want_write_file(file); 3711b8e95489SMiao Xie if (ret) 3712b8e95489SMiao Xie goto out; 3713b8e95489SMiao Xie } 3714b8e95489SMiao Xie 37150b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 371663a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 371763a212abSStefan Behrens 0); 3718475f6387SJan Schmidt 37195afe6ce7SFilipe Manana /* 37205afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37215afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37225afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37235afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37245afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37255afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37265afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37275afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37285afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37295afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37305afe6ce7SFilipe Manana */ 37315afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3732475f6387SJan Schmidt ret = -EFAULT; 3733475f6387SJan Schmidt 3734b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3735b8e95489SMiao Xie mnt_drop_write_file(file); 3736b8e95489SMiao Xie out: 3737475f6387SJan Schmidt kfree(sa); 3738475f6387SJan Schmidt return ret; 3739475f6387SJan Schmidt } 3740475f6387SJan Schmidt 37412ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3742475f6387SJan Schmidt { 3743475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3744475f6387SJan Schmidt return -EPERM; 3745475f6387SJan Schmidt 37462ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3747475f6387SJan Schmidt } 3748475f6387SJan Schmidt 37492ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3750475f6387SJan Schmidt void __user *arg) 3751475f6387SJan Schmidt { 3752475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3753475f6387SJan Schmidt int ret; 3754475f6387SJan Schmidt 3755475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3756475f6387SJan Schmidt return -EPERM; 3757475f6387SJan Schmidt 3758475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3759475f6387SJan Schmidt if (IS_ERR(sa)) 3760475f6387SJan Schmidt return PTR_ERR(sa); 3761475f6387SJan Schmidt 37622ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3763475f6387SJan Schmidt 37644fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3765475f6387SJan Schmidt ret = -EFAULT; 3766475f6387SJan Schmidt 3767475f6387SJan Schmidt kfree(sa); 3768475f6387SJan Schmidt return ret; 3769475f6387SJan Schmidt } 3770475f6387SJan Schmidt 37712ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3772b27f7c0cSDavid Sterba void __user *arg) 3773c11d2c23SStefan Behrens { 3774c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3775c11d2c23SStefan Behrens int ret; 3776c11d2c23SStefan Behrens 3777c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3778c11d2c23SStefan Behrens if (IS_ERR(sa)) 3779c11d2c23SStefan Behrens return PTR_ERR(sa); 3780c11d2c23SStefan Behrens 3781b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3782b27f7c0cSDavid Sterba kfree(sa); 3783b27f7c0cSDavid Sterba return -EPERM; 3784b27f7c0cSDavid Sterba } 3785b27f7c0cSDavid Sterba 37862ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3787c11d2c23SStefan Behrens 3788eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3789c11d2c23SStefan Behrens ret = -EFAULT; 3790c11d2c23SStefan Behrens 3791c11d2c23SStefan Behrens kfree(sa); 3792c11d2c23SStefan Behrens return ret; 3793c11d2c23SStefan Behrens } 3794c11d2c23SStefan Behrens 37952ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37962ff7e61eSJeff Mahoney void __user *arg) 37973f6bcfbdSStefan Behrens { 37983f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37993f6bcfbdSStefan Behrens int ret; 38003f6bcfbdSStefan Behrens 38013f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 38023f6bcfbdSStefan Behrens return -EPERM; 38033f6bcfbdSStefan Behrens 38043f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38053f6bcfbdSStefan Behrens if (IS_ERR(p)) 38063f6bcfbdSStefan Behrens return PTR_ERR(p); 38073f6bcfbdSStefan Behrens 38083f6bcfbdSStefan Behrens switch (p->cmd) { 38093f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3810bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3811adfa97cbSIlya Dryomov ret = -EROFS; 3812adfa97cbSIlya Dryomov goto out; 3813adfa97cbSIlya Dryomov } 3814c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3815e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38163f6bcfbdSStefan Behrens } else { 38172ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3818c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38193f6bcfbdSStefan Behrens } 38203f6bcfbdSStefan Behrens break; 38213f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38220b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38233f6bcfbdSStefan Behrens ret = 0; 38243f6bcfbdSStefan Behrens break; 38253f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 382617d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 382797282031SAnand Jain ret = 0; 38283f6bcfbdSStefan Behrens break; 38293f6bcfbdSStefan Behrens default: 38303f6bcfbdSStefan Behrens ret = -EINVAL; 38313f6bcfbdSStefan Behrens break; 38323f6bcfbdSStefan Behrens } 38333f6bcfbdSStefan Behrens 3834d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38353f6bcfbdSStefan Behrens ret = -EFAULT; 3836adfa97cbSIlya Dryomov out: 38373f6bcfbdSStefan Behrens kfree(p); 38383f6bcfbdSStefan Behrens return ret; 38393f6bcfbdSStefan Behrens } 38403f6bcfbdSStefan Behrens 3841d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3842d7728c96SJan Schmidt { 3843d7728c96SJan Schmidt int ret = 0; 3844d7728c96SJan Schmidt int i; 3845740c3d22SChris Mason u64 rel_ptr; 3846d7728c96SJan Schmidt int size; 3847806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3848d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3849d7728c96SJan Schmidt struct btrfs_path *path; 3850d7728c96SJan Schmidt 385182b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3852d7728c96SJan Schmidt return -EPERM; 3853d7728c96SJan Schmidt 3854d7728c96SJan Schmidt path = btrfs_alloc_path(); 3855d7728c96SJan Schmidt if (!path) { 3856d7728c96SJan Schmidt ret = -ENOMEM; 3857d7728c96SJan Schmidt goto out; 3858d7728c96SJan Schmidt } 3859d7728c96SJan Schmidt 3860d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3861d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3862d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3863d7728c96SJan Schmidt ipa = NULL; 3864d7728c96SJan Schmidt goto out; 3865d7728c96SJan Schmidt } 3866d7728c96SJan Schmidt 3867d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3868d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3869d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3870d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3871d7728c96SJan Schmidt ipath = NULL; 3872d7728c96SJan Schmidt goto out; 3873d7728c96SJan Schmidt } 3874d7728c96SJan Schmidt 3875d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3876d7728c96SJan Schmidt if (ret < 0) 3877d7728c96SJan Schmidt goto out; 3878d7728c96SJan Schmidt 3879d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3880745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3881745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3882740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3883d7728c96SJan Schmidt } 3884d7728c96SJan Schmidt 3885718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3886718dc5faSOmar Sandoval ipath->fspath, size); 3887d7728c96SJan Schmidt if (ret) { 3888d7728c96SJan Schmidt ret = -EFAULT; 3889d7728c96SJan Schmidt goto out; 3890d7728c96SJan Schmidt } 3891d7728c96SJan Schmidt 3892d7728c96SJan Schmidt out: 3893d7728c96SJan Schmidt btrfs_free_path(path); 3894d7728c96SJan Schmidt free_ipath(ipath); 3895d7728c96SJan Schmidt kfree(ipa); 3896d7728c96SJan Schmidt 3897d7728c96SJan Schmidt return ret; 3898d7728c96SJan Schmidt } 3899d7728c96SJan Schmidt 3900d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3901d7728c96SJan Schmidt { 3902d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3903d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3904d7728c96SJan Schmidt 3905d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3906d7728c96SJan Schmidt inodes->bytes_left -= c; 3907d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3908d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3909d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3910d7728c96SJan Schmidt inodes->elem_cnt += 3; 3911d7728c96SJan Schmidt } else { 3912d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3913d7728c96SJan Schmidt inodes->bytes_left = 0; 3914d7728c96SJan Schmidt inodes->elem_missed += 3; 3915d7728c96SJan Schmidt } 3916d7728c96SJan Schmidt 3917d7728c96SJan Schmidt return 0; 3918d7728c96SJan Schmidt } 3919d7728c96SJan Schmidt 39202ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3921d24a67b2SZygo Blaxell void __user *arg, int version) 3922d7728c96SJan Schmidt { 3923d7728c96SJan Schmidt int ret = 0; 3924d7728c96SJan Schmidt int size; 3925d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3926d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3927d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3928d24a67b2SZygo Blaxell bool ignore_offset; 3929d7728c96SJan Schmidt 3930d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3931d7728c96SJan Schmidt return -EPERM; 3932d7728c96SJan Schmidt 3933d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39347b9ea627SShailendra Verma if (IS_ERR(loi)) 39357b9ea627SShailendra Verma return PTR_ERR(loi); 3936d7728c96SJan Schmidt 3937d24a67b2SZygo Blaxell if (version == 1) { 3938d24a67b2SZygo Blaxell ignore_offset = false; 3939b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3940d24a67b2SZygo Blaxell } else { 3941d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3942d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3943d24a67b2SZygo Blaxell ret = -EINVAL; 3944d24a67b2SZygo Blaxell goto out_loi; 3945d24a67b2SZygo Blaxell } 3946d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3947d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3948d24a67b2SZygo Blaxell ret = -EINVAL; 3949d24a67b2SZygo Blaxell goto out_loi; 3950d24a67b2SZygo Blaxell } 3951d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3952b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3953d24a67b2SZygo Blaxell } 3954d24a67b2SZygo Blaxell 3955d7728c96SJan Schmidt path = btrfs_alloc_path(); 3956d7728c96SJan Schmidt if (!path) { 3957d7728c96SJan Schmidt ret = -ENOMEM; 3958d7728c96SJan Schmidt goto out; 3959d7728c96SJan Schmidt } 3960d7728c96SJan Schmidt 3961d7728c96SJan Schmidt inodes = init_data_container(size); 3962d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3963d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3964d7728c96SJan Schmidt inodes = NULL; 3965d7728c96SJan Schmidt goto out; 3966d7728c96SJan Schmidt } 3967d7728c96SJan Schmidt 39682ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3969d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3970df031f07SLiu Bo if (ret == -EINVAL) 3971d7728c96SJan Schmidt ret = -ENOENT; 3972d7728c96SJan Schmidt if (ret < 0) 3973d7728c96SJan Schmidt goto out; 3974d7728c96SJan Schmidt 3975718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3976718dc5faSOmar Sandoval size); 3977d7728c96SJan Schmidt if (ret) 3978d7728c96SJan Schmidt ret = -EFAULT; 3979d7728c96SJan Schmidt 3980d7728c96SJan Schmidt out: 3981d7728c96SJan Schmidt btrfs_free_path(path); 3982f54de068SDavid Sterba kvfree(inodes); 3983d24a67b2SZygo Blaxell out_loi: 3984d7728c96SJan Schmidt kfree(loi); 3985d7728c96SJan Schmidt 3986d7728c96SJan Schmidt return ret; 3987d7728c96SJan Schmidt } 3988d7728c96SJan Schmidt 3989008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3990c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3991c9e9f97bSIlya Dryomov { 3992c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3993c9e9f97bSIlya Dryomov 3994c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3995c9e9f97bSIlya Dryomov 39963009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3997837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3998837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3999837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4000a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4001a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4002837d5b6eSIlya Dryomov 4003c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4004c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4005c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 400619a39dceSIlya Dryomov 400719a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 400819a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 400919a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4010c9e9f97bSIlya Dryomov } 4011c9e9f97bSIlya Dryomov 40129ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4013c9e9f97bSIlya Dryomov { 4014496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4015c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4016c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4017c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4018ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4019c9e9f97bSIlya Dryomov int ret; 4020c9e9f97bSIlya Dryomov 4021c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4022c9e9f97bSIlya Dryomov return -EPERM; 4023c9e9f97bSIlya Dryomov 4024e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40259ba1f6e4SLiu Bo if (ret) 40269ba1f6e4SLiu Bo return ret; 40279ba1f6e4SLiu Bo 4028ed0fb78fSIlya Dryomov again: 4029c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4030c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4031ed0fb78fSIlya Dryomov need_unlock = true; 4032ed0fb78fSIlya Dryomov goto locked; 4033ed0fb78fSIlya Dryomov } 4034ed0fb78fSIlya Dryomov 4035ed0fb78fSIlya Dryomov /* 403601327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4037ed0fb78fSIlya Dryomov * (1) some other op is running 4038ed0fb78fSIlya Dryomov * (2) balance is running 4039ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4040ed0fb78fSIlya Dryomov */ 4041ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4042ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4043ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40443009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4045ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4046dccdb07bSDavid Sterba /* 4047dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4048dccdb07bSDavid Sterba * we'll reexamine the status again. 4049dccdb07bSDavid Sterba */ 4050ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4051ed0fb78fSIlya Dryomov 4052ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40533009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4054ed0fb78fSIlya Dryomov /* this is (3) */ 4055ed0fb78fSIlya Dryomov need_unlock = false; 4056ed0fb78fSIlya Dryomov goto locked; 4057ed0fb78fSIlya Dryomov } 4058ed0fb78fSIlya Dryomov 4059ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4060ed0fb78fSIlya Dryomov goto again; 4061ed0fb78fSIlya Dryomov } else { 4062ed0fb78fSIlya Dryomov /* this is (2) */ 4063ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4064ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4065ed0fb78fSIlya Dryomov goto out; 4066ed0fb78fSIlya Dryomov } 4067ed0fb78fSIlya Dryomov } else { 4068ed0fb78fSIlya Dryomov /* this is (1) */ 4069ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4070e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4071ed0fb78fSIlya Dryomov goto out; 4072ed0fb78fSIlya Dryomov } 4073ed0fb78fSIlya Dryomov 4074ed0fb78fSIlya Dryomov locked: 4075c9e9f97bSIlya Dryomov 4076c9e9f97bSIlya Dryomov if (arg) { 4077c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4078c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4079c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4080ed0fb78fSIlya Dryomov goto out_unlock; 4081c9e9f97bSIlya Dryomov } 4082de322263SIlya Dryomov 4083de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4084de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4085de322263SIlya Dryomov ret = -ENOTCONN; 4086de322263SIlya Dryomov goto out_bargs; 4087de322263SIlya Dryomov } 4088de322263SIlya Dryomov 4089de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4090de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4091de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4092de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4093de322263SIlya Dryomov 4094de322263SIlya Dryomov goto do_balance; 4095de322263SIlya Dryomov } 4096c9e9f97bSIlya Dryomov } else { 4097c9e9f97bSIlya Dryomov bargs = NULL; 4098c9e9f97bSIlya Dryomov } 4099c9e9f97bSIlya Dryomov 4100ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4101837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4102837d5b6eSIlya Dryomov goto out_bargs; 4103837d5b6eSIlya Dryomov } 4104837d5b6eSIlya Dryomov 41058d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4106c9e9f97bSIlya Dryomov if (!bctl) { 4107c9e9f97bSIlya Dryomov ret = -ENOMEM; 4108c9e9f97bSIlya Dryomov goto out_bargs; 4109c9e9f97bSIlya Dryomov } 4110c9e9f97bSIlya Dryomov 4111c9e9f97bSIlya Dryomov if (arg) { 4112c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4113c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4114c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4115c9e9f97bSIlya Dryomov 4116c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4117f43ffb60SIlya Dryomov } else { 4118f43ffb60SIlya Dryomov /* balance everything - no filters */ 4119f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4120c9e9f97bSIlya Dryomov } 4121c9e9f97bSIlya Dryomov 41228eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41238eb93459SDavid Sterba ret = -EINVAL; 41240f89abf5SChristian Engelmayer goto out_bctl; 41258eb93459SDavid Sterba } 41268eb93459SDavid Sterba 4127de322263SIlya Dryomov do_balance: 4128c9e9f97bSIlya Dryomov /* 4129c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4130c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4131c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4132c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4133c9e9f97bSIlya Dryomov */ 4134ed0fb78fSIlya Dryomov need_unlock = false; 4135ed0fb78fSIlya Dryomov 41366fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41370f89abf5SChristian Engelmayer bctl = NULL; 4138ed0fb78fSIlya Dryomov 4139d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4140c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4141c9e9f97bSIlya Dryomov ret = -EFAULT; 4142c9e9f97bSIlya Dryomov } 4143c9e9f97bSIlya Dryomov 41440f89abf5SChristian Engelmayer out_bctl: 41450f89abf5SChristian Engelmayer kfree(bctl); 4146c9e9f97bSIlya Dryomov out_bargs: 4147c9e9f97bSIlya Dryomov kfree(bargs); 4148ed0fb78fSIlya Dryomov out_unlock: 4149c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4150ed0fb78fSIlya Dryomov if (need_unlock) 4151c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4152ed0fb78fSIlya Dryomov out: 4153e54bfa31SLiu Bo mnt_drop_write_file(file); 4154c9e9f97bSIlya Dryomov return ret; 4155c9e9f97bSIlya Dryomov } 4156c9e9f97bSIlya Dryomov 41572ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4158837d5b6eSIlya Dryomov { 4159837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4160837d5b6eSIlya Dryomov return -EPERM; 4161837d5b6eSIlya Dryomov 4162837d5b6eSIlya Dryomov switch (cmd) { 4163837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41640b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4165a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41660b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4167837d5b6eSIlya Dryomov } 4168837d5b6eSIlya Dryomov 4169837d5b6eSIlya Dryomov return -EINVAL; 4170837d5b6eSIlya Dryomov } 4171837d5b6eSIlya Dryomov 41722ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 417319a39dceSIlya Dryomov void __user *arg) 417419a39dceSIlya Dryomov { 417519a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 417619a39dceSIlya Dryomov int ret = 0; 417719a39dceSIlya Dryomov 417819a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 417919a39dceSIlya Dryomov return -EPERM; 418019a39dceSIlya Dryomov 418119a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 418219a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 418319a39dceSIlya Dryomov ret = -ENOTCONN; 418419a39dceSIlya Dryomov goto out; 418519a39dceSIlya Dryomov } 418619a39dceSIlya Dryomov 41878d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 418819a39dceSIlya Dryomov if (!bargs) { 418919a39dceSIlya Dryomov ret = -ENOMEM; 419019a39dceSIlya Dryomov goto out; 419119a39dceSIlya Dryomov } 419219a39dceSIlya Dryomov 4193008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 419419a39dceSIlya Dryomov 419519a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 419619a39dceSIlya Dryomov ret = -EFAULT; 419719a39dceSIlya Dryomov 419819a39dceSIlya Dryomov kfree(bargs); 419919a39dceSIlya Dryomov out: 420019a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 420119a39dceSIlya Dryomov return ret; 420219a39dceSIlya Dryomov } 420319a39dceSIlya Dryomov 4204905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 42055d13a37bSArne Jansen { 42060b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42070b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42085d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 42095d13a37bSArne Jansen int ret; 42105d13a37bSArne Jansen 42115d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42125d13a37bSArne Jansen return -EPERM; 42135d13a37bSArne Jansen 4214905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4215905b0ddaSMiao Xie if (ret) 4216905b0ddaSMiao Xie return ret; 42175d13a37bSArne Jansen 42185d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4219905b0ddaSMiao Xie if (IS_ERR(sa)) { 4220905b0ddaSMiao Xie ret = PTR_ERR(sa); 4221905b0ddaSMiao Xie goto drop_write; 4222905b0ddaSMiao Xie } 42235d13a37bSArne Jansen 42240b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42255d13a37bSArne Jansen 42265d13a37bSArne Jansen switch (sa->cmd) { 42275d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4228340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42295d13a37bSArne Jansen break; 42305d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4231340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42325d13a37bSArne Jansen break; 42335d13a37bSArne Jansen default: 42345d13a37bSArne Jansen ret = -EINVAL; 42355d13a37bSArne Jansen break; 42365d13a37bSArne Jansen } 42375d13a37bSArne Jansen 42385d13a37bSArne Jansen kfree(sa); 42390b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4240905b0ddaSMiao Xie drop_write: 4241905b0ddaSMiao Xie mnt_drop_write_file(file); 42425d13a37bSArne Jansen return ret; 42435d13a37bSArne Jansen } 42445d13a37bSArne Jansen 4245905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42465d13a37bSArne Jansen { 42470b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42480b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42490b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42505d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42515d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42525d13a37bSArne Jansen int ret; 42535d13a37bSArne Jansen int err; 42545d13a37bSArne Jansen 42555d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42565d13a37bSArne Jansen return -EPERM; 42575d13a37bSArne Jansen 4258905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4259905b0ddaSMiao Xie if (ret) 4260905b0ddaSMiao Xie return ret; 42615d13a37bSArne Jansen 42625d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4263905b0ddaSMiao Xie if (IS_ERR(sa)) { 4264905b0ddaSMiao Xie ret = PTR_ERR(sa); 4265905b0ddaSMiao Xie goto drop_write; 4266905b0ddaSMiao Xie } 42675d13a37bSArne Jansen 42685d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42695d13a37bSArne Jansen if (IS_ERR(trans)) { 42705d13a37bSArne Jansen ret = PTR_ERR(trans); 42715d13a37bSArne Jansen goto out; 42725d13a37bSArne Jansen } 42735d13a37bSArne Jansen 42745d13a37bSArne Jansen if (sa->assign) { 42759f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42765d13a37bSArne Jansen } else { 427739616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42785d13a37bSArne Jansen } 42795d13a37bSArne Jansen 4280e082f563SQu Wenruo /* update qgroup status and info */ 4281280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4282e082f563SQu Wenruo if (err < 0) 42830b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4284ad8403dfSAnand Jain "failed to update qgroup status and info"); 42853a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42865d13a37bSArne Jansen if (err && !ret) 42875d13a37bSArne Jansen ret = err; 42885d13a37bSArne Jansen 42895d13a37bSArne Jansen out: 42905d13a37bSArne Jansen kfree(sa); 4291905b0ddaSMiao Xie drop_write: 4292905b0ddaSMiao Xie mnt_drop_write_file(file); 42935d13a37bSArne Jansen return ret; 42945d13a37bSArne Jansen } 42955d13a37bSArne Jansen 4296905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42975d13a37bSArne Jansen { 42980b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42990b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43005d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 43015d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43025d13a37bSArne Jansen int ret; 43035d13a37bSArne Jansen int err; 43045d13a37bSArne Jansen 43055d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43065d13a37bSArne Jansen return -EPERM; 43075d13a37bSArne Jansen 4308905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4309905b0ddaSMiao Xie if (ret) 4310905b0ddaSMiao Xie return ret; 43115d13a37bSArne Jansen 43125d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4313905b0ddaSMiao Xie if (IS_ERR(sa)) { 4314905b0ddaSMiao Xie ret = PTR_ERR(sa); 4315905b0ddaSMiao Xie goto drop_write; 4316905b0ddaSMiao Xie } 43175d13a37bSArne Jansen 4318d86e56cfSMiao Xie if (!sa->qgroupid) { 4319d86e56cfSMiao Xie ret = -EINVAL; 4320d86e56cfSMiao Xie goto out; 4321d86e56cfSMiao Xie } 4322d86e56cfSMiao Xie 43235d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43245d13a37bSArne Jansen if (IS_ERR(trans)) { 43255d13a37bSArne Jansen ret = PTR_ERR(trans); 43265d13a37bSArne Jansen goto out; 43275d13a37bSArne Jansen } 43285d13a37bSArne Jansen 43295d13a37bSArne Jansen if (sa->create) { 433049a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43315d13a37bSArne Jansen } else { 43323efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43335d13a37bSArne Jansen } 43345d13a37bSArne Jansen 43353a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43365d13a37bSArne Jansen if (err && !ret) 43375d13a37bSArne Jansen ret = err; 43385d13a37bSArne Jansen 43395d13a37bSArne Jansen out: 43405d13a37bSArne Jansen kfree(sa); 4341905b0ddaSMiao Xie drop_write: 4342905b0ddaSMiao Xie mnt_drop_write_file(file); 43435d13a37bSArne Jansen return ret; 43445d13a37bSArne Jansen } 43455d13a37bSArne Jansen 4346905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43475d13a37bSArne Jansen { 43480b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43490b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43505d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43515d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43525d13a37bSArne Jansen int ret; 43535d13a37bSArne Jansen int err; 43545d13a37bSArne Jansen u64 qgroupid; 43555d13a37bSArne Jansen 43565d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43575d13a37bSArne Jansen return -EPERM; 43585d13a37bSArne Jansen 4359905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4360905b0ddaSMiao Xie if (ret) 4361905b0ddaSMiao Xie return ret; 43625d13a37bSArne Jansen 43635d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4364905b0ddaSMiao Xie if (IS_ERR(sa)) { 4365905b0ddaSMiao Xie ret = PTR_ERR(sa); 4366905b0ddaSMiao Xie goto drop_write; 4367905b0ddaSMiao Xie } 43685d13a37bSArne Jansen 43695d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43705d13a37bSArne Jansen if (IS_ERR(trans)) { 43715d13a37bSArne Jansen ret = PTR_ERR(trans); 43725d13a37bSArne Jansen goto out; 43735d13a37bSArne Jansen } 43745d13a37bSArne Jansen 43755d13a37bSArne Jansen qgroupid = sa->qgroupid; 43765d13a37bSArne Jansen if (!qgroupid) { 43775d13a37bSArne Jansen /* take the current subvol as qgroup */ 43785d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43795d13a37bSArne Jansen } 43805d13a37bSArne Jansen 4381f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43825d13a37bSArne Jansen 43833a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43845d13a37bSArne Jansen if (err && !ret) 43855d13a37bSArne Jansen ret = err; 43865d13a37bSArne Jansen 43875d13a37bSArne Jansen out: 43885d13a37bSArne Jansen kfree(sa); 4389905b0ddaSMiao Xie drop_write: 4390905b0ddaSMiao Xie mnt_drop_write_file(file); 43915d13a37bSArne Jansen return ret; 43925d13a37bSArne Jansen } 43935d13a37bSArne Jansen 43942f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43952f232036SJan Schmidt { 43960b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43970b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43982f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43992f232036SJan Schmidt int ret; 44002f232036SJan Schmidt 44012f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44022f232036SJan Schmidt return -EPERM; 44032f232036SJan Schmidt 44042f232036SJan Schmidt ret = mnt_want_write_file(file); 44052f232036SJan Schmidt if (ret) 44062f232036SJan Schmidt return ret; 44072f232036SJan Schmidt 44082f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 44092f232036SJan Schmidt if (IS_ERR(qsa)) { 44102f232036SJan Schmidt ret = PTR_ERR(qsa); 44112f232036SJan Schmidt goto drop_write; 44122f232036SJan Schmidt } 44132f232036SJan Schmidt 44142f232036SJan Schmidt if (qsa->flags) { 44152f232036SJan Schmidt ret = -EINVAL; 44162f232036SJan Schmidt goto out; 44172f232036SJan Schmidt } 44182f232036SJan Schmidt 44190b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44202f232036SJan Schmidt 44212f232036SJan Schmidt out: 44222f232036SJan Schmidt kfree(qsa); 44232f232036SJan Schmidt drop_write: 44242f232036SJan Schmidt mnt_drop_write_file(file); 44252f232036SJan Schmidt return ret; 44262f232036SJan Schmidt } 44272f232036SJan Schmidt 4428b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4429b929c1d8SMarcos Paulo de Souza void __user *arg) 44302f232036SJan Schmidt { 44310afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 44322f232036SJan Schmidt int ret = 0; 44332f232036SJan Schmidt 44342f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44352f232036SJan Schmidt return -EPERM; 44362f232036SJan Schmidt 44370b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44380afb603aSGoldwyn Rodrigues qsa.flags = 1; 44390afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 44402f232036SJan Schmidt } 44412f232036SJan Schmidt 44420afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 44432f232036SJan Schmidt ret = -EFAULT; 44442f232036SJan Schmidt 44452f232036SJan Schmidt return ret; 44462f232036SJan Schmidt } 44472f232036SJan Schmidt 4448b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4449b929c1d8SMarcos Paulo de Souza void __user *arg) 445057254b6eSJan Schmidt { 445157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 445257254b6eSJan Schmidt return -EPERM; 445357254b6eSJan Schmidt 44540b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 445557254b6eSJan Schmidt } 445657254b6eSJan Schmidt 4457abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4458e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4459abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44608ea05e3aSAlexander Block { 4461496ad9aaSAl Viro struct inode *inode = file_inode(file); 44620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44638ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44648ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44658ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 446695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44678ea05e3aSAlexander Block int ret = 0; 4468dd5f9615SStefan Behrens int received_uuid_changed; 44698ea05e3aSAlexander Block 4470e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4471bd60ea0fSDavid Sterba return -EPERM; 4472bd60ea0fSDavid Sterba 44738ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44748ea05e3aSAlexander Block if (ret < 0) 44758ea05e3aSAlexander Block return ret; 44768ea05e3aSAlexander Block 44770b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44788ea05e3aSAlexander Block 44794a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44808ea05e3aSAlexander Block ret = -EINVAL; 44818ea05e3aSAlexander Block goto out; 44828ea05e3aSAlexander Block } 44838ea05e3aSAlexander Block 44848ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44858ea05e3aSAlexander Block ret = -EROFS; 44868ea05e3aSAlexander Block goto out; 44878ea05e3aSAlexander Block } 44888ea05e3aSAlexander Block 4489dd5f9615SStefan Behrens /* 4490dd5f9615SStefan Behrens * 1 - root item 4491dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4492dd5f9615SStefan Behrens */ 4493dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44948ea05e3aSAlexander Block if (IS_ERR(trans)) { 44958ea05e3aSAlexander Block ret = PTR_ERR(trans); 44968ea05e3aSAlexander Block trans = NULL; 44978ea05e3aSAlexander Block goto out; 44988ea05e3aSAlexander Block } 44998ea05e3aSAlexander Block 45008ea05e3aSAlexander Block sa->rtransid = trans->transid; 45018ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 45028ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 45038ea05e3aSAlexander Block 4504dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4505dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4506dd5f9615SStefan Behrens if (received_uuid_changed && 4507d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4508d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4509dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4510dd5f9615SStefan Behrens root->root_key.objectid); 4511d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4512d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4513d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4514d87ff758SNikolay Borisov goto out; 4515d87ff758SNikolay Borisov } 4516d87ff758SNikolay Borisov } 45178ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45188ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45198ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45203cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45213cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45223cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45233cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45248ea05e3aSAlexander Block 45250b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45268ea05e3aSAlexander Block &root->root_key, &root->root_item); 45278ea05e3aSAlexander Block if (ret < 0) { 45283a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45298ea05e3aSAlexander Block goto out; 4530dd5f9615SStefan Behrens } 4531dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4532cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4533dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4534dd5f9615SStefan Behrens root->root_key.objectid); 4535dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 453666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4537efd38150SNikolay Borisov btrfs_end_transaction(trans); 4538dd5f9615SStefan Behrens goto out; 4539dd5f9615SStefan Behrens } 4540dd5f9615SStefan Behrens } 45413a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4542abccd00fSHugo Mills out: 45430b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4544abccd00fSHugo Mills mnt_drop_write_file(file); 4545abccd00fSHugo Mills return ret; 4546abccd00fSHugo Mills } 4547abccd00fSHugo Mills 4548abccd00fSHugo Mills #ifdef CONFIG_64BIT 4549abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4550abccd00fSHugo Mills void __user *arg) 4551abccd00fSHugo Mills { 4552abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4553abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4554abccd00fSHugo Mills int ret = 0; 4555abccd00fSHugo Mills 4556abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45577b9ea627SShailendra Verma if (IS_ERR(args32)) 45587b9ea627SShailendra Verma return PTR_ERR(args32); 4559abccd00fSHugo Mills 45608d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 456184dbeb87SDan Carpenter if (!args64) { 456284dbeb87SDan Carpenter ret = -ENOMEM; 4563abccd00fSHugo Mills goto out; 4564abccd00fSHugo Mills } 4565abccd00fSHugo Mills 4566abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4567abccd00fSHugo Mills args64->stransid = args32->stransid; 4568abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4569abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4570abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4571abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4572abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4573abccd00fSHugo Mills args64->flags = args32->flags; 4574abccd00fSHugo Mills 4575e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4576abccd00fSHugo Mills if (ret) 4577abccd00fSHugo Mills goto out; 4578abccd00fSHugo Mills 4579abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4580abccd00fSHugo Mills args32->stransid = args64->stransid; 4581abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4582abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4583abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4584abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4585abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4586abccd00fSHugo Mills args32->flags = args64->flags; 4587abccd00fSHugo Mills 4588abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4589abccd00fSHugo Mills if (ret) 4590abccd00fSHugo Mills ret = -EFAULT; 4591abccd00fSHugo Mills 4592abccd00fSHugo Mills out: 4593abccd00fSHugo Mills kfree(args32); 4594abccd00fSHugo Mills kfree(args64); 4595abccd00fSHugo Mills return ret; 4596abccd00fSHugo Mills } 4597abccd00fSHugo Mills #endif 4598abccd00fSHugo Mills 4599abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4600abccd00fSHugo Mills void __user *arg) 4601abccd00fSHugo Mills { 4602abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4603abccd00fSHugo Mills int ret = 0; 4604abccd00fSHugo Mills 4605abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 46067b9ea627SShailendra Verma if (IS_ERR(sa)) 46077b9ea627SShailendra Verma return PTR_ERR(sa); 4608abccd00fSHugo Mills 4609e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4610abccd00fSHugo Mills 4611abccd00fSHugo Mills if (ret) 4612abccd00fSHugo Mills goto out; 4613abccd00fSHugo Mills 46148ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46158ea05e3aSAlexander Block if (ret) 46168ea05e3aSAlexander Block ret = -EFAULT; 46178ea05e3aSAlexander Block 46188ea05e3aSAlexander Block out: 46198ea05e3aSAlexander Block kfree(sa); 46208ea05e3aSAlexander Block return ret; 46218ea05e3aSAlexander Block } 46228ea05e3aSAlexander Block 4623b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4624b929c1d8SMarcos Paulo de Souza void __user *arg) 4625867ab667Sjeff.liu { 4626a1b83ac5SAnand Jain size_t len; 4627867ab667Sjeff.liu int ret; 4628a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4629a1b83ac5SAnand Jain 46300b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46310b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46320b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4633a1b83ac5SAnand Jain 4634a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4635867ab667Sjeff.liu 4636867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46370b246afaSJeff Mahoney btrfs_warn(fs_info, 46380b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46390b246afaSJeff Mahoney --len); 4640867ab667Sjeff.liu } 4641867ab667Sjeff.liu 4642867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4643867ab667Sjeff.liu 4644867ab667Sjeff.liu return ret ? -EFAULT : 0; 4645867ab667Sjeff.liu } 4646867ab667Sjeff.liu 4647a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4648a8bfd4abSjeff.liu { 46490b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46510b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46520b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4653a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4654a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4655a8bfd4abSjeff.liu int ret; 4656a8bfd4abSjeff.liu 4657a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4658a8bfd4abSjeff.liu return -EPERM; 4659a8bfd4abSjeff.liu 4660a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4661a8bfd4abSjeff.liu return -EFAULT; 4662a8bfd4abSjeff.liu 4663a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46640b246afaSJeff Mahoney btrfs_err(fs_info, 46655d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4666a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4667a8bfd4abSjeff.liu return -EINVAL; 4668a8bfd4abSjeff.liu } 4669a8bfd4abSjeff.liu 4670a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4671a8bfd4abSjeff.liu if (ret) 4672a8bfd4abSjeff.liu return ret; 4673a8bfd4abSjeff.liu 4674a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4675a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4676a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4677a8bfd4abSjeff.liu goto out_unlock; 4678a8bfd4abSjeff.liu } 4679a8bfd4abSjeff.liu 46800b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4681a8bfd4abSjeff.liu strcpy(super_block->label, label); 46820b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46833a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4684a8bfd4abSjeff.liu 4685a8bfd4abSjeff.liu out_unlock: 4686a8bfd4abSjeff.liu mnt_drop_write_file(file); 4687a8bfd4abSjeff.liu return ret; 4688a8bfd4abSjeff.liu } 4689a8bfd4abSjeff.liu 46902eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46912eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46922eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46932eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46942eaa055fSJeff Mahoney 4695d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46962eaa055fSJeff Mahoney { 46974d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46982eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46992eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 47002eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 47012eaa055fSJeff Mahoney }; 47022eaa055fSJeff Mahoney 47032eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47042eaa055fSJeff Mahoney return -EFAULT; 47052eaa055fSJeff Mahoney 47062eaa055fSJeff Mahoney return 0; 47072eaa055fSJeff Mahoney } 47082eaa055fSJeff Mahoney 4709b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4710b929c1d8SMarcos Paulo de Souza void __user *arg) 47112eaa055fSJeff Mahoney { 47120b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47132eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47142eaa055fSJeff Mahoney 47152eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47162eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47172eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47182eaa055fSJeff Mahoney 47192eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47202eaa055fSJeff Mahoney return -EFAULT; 47212eaa055fSJeff Mahoney 47222eaa055fSJeff Mahoney return 0; 47232eaa055fSJeff Mahoney } 47242eaa055fSJeff Mahoney 47252ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47263b02a68aSJeff Mahoney enum btrfs_feature_set set, 47272eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47282eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47292eaa055fSJeff Mahoney { 4730f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47313b02a68aSJeff Mahoney char *names; 47322eaa055fSJeff Mahoney u64 disallowed, unsupported; 47332eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47342eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47352eaa055fSJeff Mahoney 47362eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47372eaa055fSJeff Mahoney if (unsupported) { 47383b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47393b02a68aSJeff Mahoney if (names) { 47400b246afaSJeff Mahoney btrfs_warn(fs_info, 47413b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47423b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47433b02a68aSJeff Mahoney kfree(names); 47443b02a68aSJeff Mahoney } else 47450b246afaSJeff Mahoney btrfs_warn(fs_info, 47462eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47472eaa055fSJeff Mahoney type, unsupported); 47482eaa055fSJeff Mahoney return -EOPNOTSUPP; 47492eaa055fSJeff Mahoney } 47502eaa055fSJeff Mahoney 47512eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47522eaa055fSJeff Mahoney if (disallowed) { 47533b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47543b02a68aSJeff Mahoney if (names) { 47550b246afaSJeff Mahoney btrfs_warn(fs_info, 47563b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47573b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47583b02a68aSJeff Mahoney kfree(names); 47593b02a68aSJeff Mahoney } else 47600b246afaSJeff Mahoney btrfs_warn(fs_info, 47612eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47622eaa055fSJeff Mahoney type, disallowed); 47632eaa055fSJeff Mahoney return -EPERM; 47642eaa055fSJeff Mahoney } 47652eaa055fSJeff Mahoney 47662eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47672eaa055fSJeff Mahoney if (disallowed) { 47683b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47693b02a68aSJeff Mahoney if (names) { 47700b246afaSJeff Mahoney btrfs_warn(fs_info, 47713b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47723b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47733b02a68aSJeff Mahoney kfree(names); 47743b02a68aSJeff Mahoney } else 47750b246afaSJeff Mahoney btrfs_warn(fs_info, 47762eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47772eaa055fSJeff Mahoney type, disallowed); 47782eaa055fSJeff Mahoney return -EPERM; 47792eaa055fSJeff Mahoney } 47802eaa055fSJeff Mahoney 47812eaa055fSJeff Mahoney return 0; 47822eaa055fSJeff Mahoney } 47832eaa055fSJeff Mahoney 47842ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47852ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47862eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47872eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47882eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47892eaa055fSJeff Mahoney 47902eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47912eaa055fSJeff Mahoney { 47920b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47940b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47950b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47962eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47972eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47982eaa055fSJeff Mahoney u64 newflags; 47992eaa055fSJeff Mahoney int ret; 48002eaa055fSJeff Mahoney 48012eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 48022eaa055fSJeff Mahoney return -EPERM; 48032eaa055fSJeff Mahoney 48042eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 48052eaa055fSJeff Mahoney return -EFAULT; 48062eaa055fSJeff Mahoney 48072eaa055fSJeff Mahoney /* Nothing to do */ 48082eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48092eaa055fSJeff Mahoney !flags[0].incompat_flags) 48102eaa055fSJeff Mahoney return 0; 48112eaa055fSJeff Mahoney 48122ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 48132eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48142eaa055fSJeff Mahoney if (ret) 48152eaa055fSJeff Mahoney return ret; 48162eaa055fSJeff Mahoney 48172ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48182eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48192eaa055fSJeff Mahoney if (ret) 48202eaa055fSJeff Mahoney return ret; 48212eaa055fSJeff Mahoney 48222ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48232eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48242eaa055fSJeff Mahoney if (ret) 48252eaa055fSJeff Mahoney return ret; 48262eaa055fSJeff Mahoney 48277ab19625SDavid Sterba ret = mnt_want_write_file(file); 48287ab19625SDavid Sterba if (ret) 48297ab19625SDavid Sterba return ret; 48307ab19625SDavid Sterba 48318051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48327ab19625SDavid Sterba if (IS_ERR(trans)) { 48337ab19625SDavid Sterba ret = PTR_ERR(trans); 48347ab19625SDavid Sterba goto out_drop_write; 48357ab19625SDavid Sterba } 48362eaa055fSJeff Mahoney 48370b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48382eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48392eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48402eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48412eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48422eaa055fSJeff Mahoney 48432eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48442eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48452eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48462eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48472eaa055fSJeff Mahoney 48482eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48492eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48502eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48512eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48520b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48532eaa055fSJeff Mahoney 48543a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48557ab19625SDavid Sterba out_drop_write: 48567ab19625SDavid Sterba mnt_drop_write_file(file); 48577ab19625SDavid Sterba 48587ab19625SDavid Sterba return ret; 48592eaa055fSJeff Mahoney } 48602eaa055fSJeff Mahoney 48612351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48622351f431SJosef Bacik { 48632351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48642351f431SJosef Bacik int ret; 48652351f431SJosef Bacik 48662351f431SJosef Bacik if (compat) { 48672351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48682351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48692351f431SJosef Bacik 48702351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48712351f431SJosef Bacik if (ret) 48722351f431SJosef Bacik return -EFAULT; 48732351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48742351f431SJosef Bacik if (!arg) 48752351f431SJosef Bacik return -ENOMEM; 48762351f431SJosef Bacik arg->send_fd = args32.send_fd; 48772351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48782351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48792351f431SJosef Bacik arg->parent_root = args32.parent_root; 48802351f431SJosef Bacik arg->flags = args32.flags; 48812351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48822351f431SJosef Bacik sizeof(args32.reserved)); 48832351f431SJosef Bacik #else 48842351f431SJosef Bacik return -ENOTTY; 48852351f431SJosef Bacik #endif 48862351f431SJosef Bacik } else { 48872351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48882351f431SJosef Bacik if (IS_ERR(arg)) 48892351f431SJosef Bacik return PTR_ERR(arg); 48902351f431SJosef Bacik } 48912351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48922351f431SJosef Bacik kfree(arg); 48932351f431SJosef Bacik return ret; 48942351f431SJosef Bacik } 48952351f431SJosef Bacik 4896f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4897f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4898f46b5a66SChristoph Hellwig { 48990b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49000b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49010b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49024bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4903f46b5a66SChristoph Hellwig 4904f46b5a66SChristoph Hellwig switch (cmd) { 49056cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49066cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 490740cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4908b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 490940cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 491040cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4911f7039b1dSLi Dongyang case FITRIM: 4912b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4913f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4914fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4915fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4916fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49173de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4918fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49196f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49206f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 492176dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4922949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4923949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4924949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49250caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49260caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49270caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49280caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49296ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49306ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4931f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49321e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49331e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49341e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4935f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4936198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4937f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49382ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4939f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4940da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49416b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49426b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4943475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49442ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4945475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49462ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4947f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49489ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4949ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4950ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4951cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4952cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4953ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4954ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4955d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4956d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4957d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4958d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4959d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4960d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49611406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49622ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49639b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49649b199859SFilipe David Borba Manana int ret; 49659b199859SFilipe David Borba Manana 49669db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 49679b199859SFilipe David Borba Manana if (ret) 49689b199859SFilipe David Borba Manana return ret; 49690b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49702fad4e83SDavid Sterba /* 49712fad4e83SDavid Sterba * The transaction thread may want to do more work, 497201327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49732fad4e83SDavid Sterba * processing uncleaned subvols. 49742fad4e83SDavid Sterba */ 49750b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49769b199859SFilipe David Borba Manana return ret; 49779b199859SFilipe David Borba Manana } 497846204592SSage Weil case BTRFS_IOC_START_SYNC: 49799a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 498046204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49812ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4982475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4983b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4984475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49852ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4986475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49872ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4988c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49899ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4990837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49912ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 499219a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49932ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49948ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49958ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4996abccd00fSHugo Mills #ifdef CONFIG_64BIT 4997abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4998abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4999abccd00fSHugo Mills #endif 500031db9f7cSAlexander Block case BTRFS_IOC_SEND: 50012351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 50022351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50032351f431SJosef Bacik case BTRFS_IOC_SEND_32: 50042351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 50052351f431SJosef Bacik #endif 5006c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 50072ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 50085d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5009905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50105d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5011905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50125d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5013905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50145d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5015905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50162f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50172f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50182f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5019b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 502057254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5021b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50223f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50232ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50242eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5025d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50262eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5027b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50282eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50292eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5030b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5031b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 503242e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 503342e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 503423d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 503523d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 503614605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 503714605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 503814605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 503914605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 5040f46b5a66SChristoph Hellwig } 5041f46b5a66SChristoph Hellwig 5042f46b5a66SChristoph Hellwig return -ENOTTY; 5043f46b5a66SChristoph Hellwig } 50444c63c245SLuke Dashjr 50454c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50464c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50474c63c245SLuke Dashjr { 50482a362249SJeff Mahoney /* 50492a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50502a362249SJeff Mahoney * handling is necessary. 50512a362249SJeff Mahoney */ 50524c63c245SLuke Dashjr switch (cmd) { 50534c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50544c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50554c63c245SLuke Dashjr break; 50564c63c245SLuke Dashjr } 50574c63c245SLuke Dashjr 50584c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50594c63c245SLuke Dashjr } 50604c63c245SLuke Dashjr #endif 5061