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; 100076068caeSQu Wenruo const u32 sectorsize = btrfs_sb(inode->i_sb)->sectorsize; 10014cb5300bSChris Mason u64 end; 10024cb5300bSChris Mason 10034cb5300bSChris Mason read_lock(&em_tree->lock); 100476068caeSQu Wenruo em = lookup_extent_mapping(em_tree, offset, sectorsize); 10054cb5300bSChris Mason read_unlock(&em_tree->lock); 10064cb5300bSChris Mason 10074cb5300bSChris Mason if (em) { 10084cb5300bSChris Mason end = extent_map_end(em); 10094cb5300bSChris Mason free_extent_map(em); 10104cb5300bSChris Mason if (end - offset > thresh) 10114cb5300bSChris Mason return 0; 10124cb5300bSChris Mason } 10134cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10144cb5300bSChris Mason thresh /= 2; 10154cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10164cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10174cb5300bSChris Mason if (end >= thresh) 10184cb5300bSChris Mason return 0; 10194cb5300bSChris Mason return 1; 10204cb5300bSChris Mason } 10214cb5300bSChris Mason 10224cb5300bSChris Mason /* 10234cb5300bSChris Mason * helper function to walk through a file and find extents 10244cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10254cb5300bSChris Mason * 10264cb5300bSChris Mason * This is used by the defragging code to find new and small 10274cb5300bSChris Mason * extents 10284cb5300bSChris Mason */ 10294cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10304cb5300bSChris Mason struct inode *inode, u64 newer_than, 1031aab110abSDavid Sterba u64 *off, u32 thresh) 10324cb5300bSChris Mason { 10334cb5300bSChris Mason struct btrfs_path *path; 10344cb5300bSChris Mason struct btrfs_key min_key; 10354cb5300bSChris Mason struct extent_buffer *leaf; 10364cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10374cb5300bSChris Mason int type; 10384cb5300bSChris Mason int ret; 10394a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 10404cb5300bSChris Mason 10414cb5300bSChris Mason path = btrfs_alloc_path(); 10424cb5300bSChris Mason if (!path) 10434cb5300bSChris Mason return -ENOMEM; 10444cb5300bSChris Mason 1045a4689d2bSDavid Sterba min_key.objectid = ino; 10464cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 10474cb5300bSChris Mason min_key.offset = *off; 10484cb5300bSChris Mason 10494cb5300bSChris Mason while (1) { 10506174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 10514cb5300bSChris Mason if (ret != 0) 10524cb5300bSChris Mason goto none; 1053f094c9bdSFilipe Manana process_slot: 1054a4689d2bSDavid Sterba if (min_key.objectid != ino) 10554cb5300bSChris Mason goto none; 10564cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 10574cb5300bSChris Mason goto none; 10584cb5300bSChris Mason 10594cb5300bSChris Mason leaf = path->nodes[0]; 10604cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 10614cb5300bSChris Mason struct btrfs_file_extent_item); 10624cb5300bSChris Mason 10634cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 10644cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 10654cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 10664cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 10674cb5300bSChris Mason *off = min_key.offset; 10684cb5300bSChris Mason btrfs_free_path(path); 10694cb5300bSChris Mason return 0; 10704cb5300bSChris Mason } 10714cb5300bSChris Mason 1072f094c9bdSFilipe Manana path->slots[0]++; 1073f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1074f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1075f094c9bdSFilipe Manana goto process_slot; 1076f094c9bdSFilipe Manana } 1077f094c9bdSFilipe Manana 10784cb5300bSChris Mason if (min_key.offset == (u64)-1) 10794cb5300bSChris Mason goto none; 10804cb5300bSChris Mason 10814cb5300bSChris Mason min_key.offset++; 10824cb5300bSChris Mason btrfs_release_path(path); 10834cb5300bSChris Mason } 10844cb5300bSChris Mason none: 10854cb5300bSChris Mason btrfs_free_path(path); 10864cb5300bSChris Mason return -ENOENT; 10874cb5300bSChris Mason } 10884cb5300bSChris Mason 10896c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 109017ce6ef8SLiu Bo { 109117ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1092940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10936c282eb4SLi Zefan struct extent_map *em; 109476068caeSQu Wenruo const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; 1095940100a4SChris Mason 1096940100a4SChris Mason /* 1097940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1098940100a4SChris Mason * the full extent lock 1099940100a4SChris Mason */ 1100940100a4SChris Mason read_lock(&em_tree->lock); 110176068caeSQu Wenruo em = lookup_extent_mapping(em_tree, start, sectorsize); 1102940100a4SChris Mason read_unlock(&em_tree->lock); 1103940100a4SChris Mason 1104940100a4SChris Mason if (!em) { 1105308d9800SFilipe Manana struct extent_state *cached = NULL; 110676068caeSQu Wenruo u64 end = start + sectorsize - 1; 1107308d9800SFilipe Manana 1108940100a4SChris Mason /* get the big lock and read metadata off disk */ 1109ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 111076068caeSQu Wenruo em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, sectorsize); 1111e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1112940100a4SChris Mason 11136cf8bfbfSDan Carpenter if (IS_ERR(em)) 11146c282eb4SLi Zefan return NULL; 1115940100a4SChris Mason } 1116940100a4SChris Mason 11176c282eb4SLi Zefan return em; 11186c282eb4SLi Zefan } 11196c282eb4SLi Zefan 11206c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11216c282eb4SLi Zefan { 11226c282eb4SLi Zefan struct extent_map *next; 11236c282eb4SLi Zefan bool ret = true; 11246c282eb4SLi Zefan 11256c282eb4SLi Zefan /* this is the last extent */ 11266c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11276c282eb4SLi Zefan return false; 11286c282eb4SLi Zefan 11296c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1130e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1131e9512d72SChris Mason ret = false; 1132e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1133ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11346c282eb4SLi Zefan ret = false; 11356c282eb4SLi Zefan 11366c282eb4SLi Zefan free_extent_map(next); 11376c282eb4SLi Zefan return ret; 11386c282eb4SLi Zefan } 11396c282eb4SLi Zefan 1140aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1141a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1142a43a2111SAndrew Mahone int compress) 11436c282eb4SLi Zefan { 11446c282eb4SLi Zefan struct extent_map *em; 11456c282eb4SLi Zefan int ret = 1; 11466c282eb4SLi Zefan bool next_mergeable = true; 11474a3560c4SLiu Bo bool prev_mergeable = true; 11486c282eb4SLi Zefan 11496c282eb4SLi Zefan /* 11506c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 11516c282eb4SLi Zefan * defragging it 11526c282eb4SLi Zefan */ 11536c282eb4SLi Zefan if (start < *defrag_end) 11546c282eb4SLi Zefan return 1; 11556c282eb4SLi Zefan 11566c282eb4SLi Zefan *skip = 0; 11576c282eb4SLi Zefan 11586c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 11596c282eb4SLi Zefan if (!em) 11606c282eb4SLi Zefan return 0; 11616c282eb4SLi Zefan 1162940100a4SChris Mason /* this will cover holes, and inline extents */ 116317ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1164940100a4SChris Mason ret = 0; 116517ce6ef8SLiu Bo goto out; 116617ce6ef8SLiu Bo } 116717ce6ef8SLiu Bo 11684a3560c4SLiu Bo if (!*defrag_end) 11694a3560c4SLiu Bo prev_mergeable = false; 11704a3560c4SLiu Bo 11716c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1172940100a4SChris Mason /* 11736c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 11746c282eb4SLi Zefan * real extent, don't bother defragging it 1175940100a4SChris Mason */ 1176a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 11774a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1178940100a4SChris Mason ret = 0; 117917ce6ef8SLiu Bo out: 1180940100a4SChris Mason /* 1181940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1182940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1183940100a4SChris Mason * so that the next tiny extent will force a defrag. 1184940100a4SChris Mason * 1185940100a4SChris Mason * The end result of this is that tiny extents before a single big 1186940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1187940100a4SChris Mason */ 1188940100a4SChris Mason if (ret) { 1189940100a4SChris Mason *defrag_end = extent_map_end(em); 1190940100a4SChris Mason } else { 1191940100a4SChris Mason *last_len = 0; 1192940100a4SChris Mason *skip = extent_map_end(em); 1193940100a4SChris Mason *defrag_end = 0; 1194940100a4SChris Mason } 1195940100a4SChris Mason 1196940100a4SChris Mason free_extent_map(em); 1197940100a4SChris Mason return ret; 1198940100a4SChris Mason } 1199940100a4SChris Mason 12004cb5300bSChris Mason /* 12015767b50cSQu Wenruo * Prepare one page to be defragged. 12025767b50cSQu Wenruo * 12035767b50cSQu Wenruo * This will ensure: 12045767b50cSQu Wenruo * 12055767b50cSQu Wenruo * - Returned page is locked and has been set up properly. 12065767b50cSQu Wenruo * - No ordered extent exists in the page. 12075767b50cSQu Wenruo * - The page is uptodate. 12085767b50cSQu Wenruo * 12095767b50cSQu Wenruo * NOTE: Caller should also wait for page writeback after the cluster is 12105767b50cSQu Wenruo * prepared, here we don't do writeback wait for each page. 12115767b50cSQu Wenruo */ 12125767b50cSQu Wenruo static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, 12135767b50cSQu Wenruo pgoff_t index) 12145767b50cSQu Wenruo { 12155767b50cSQu Wenruo struct address_space *mapping = inode->vfs_inode.i_mapping; 12165767b50cSQu Wenruo gfp_t mask = btrfs_alloc_write_mask(mapping); 12175767b50cSQu Wenruo u64 page_start = (u64)index << PAGE_SHIFT; 12185767b50cSQu Wenruo u64 page_end = page_start + PAGE_SIZE - 1; 12195767b50cSQu Wenruo struct extent_state *cached_state = NULL; 12205767b50cSQu Wenruo struct page *page; 12215767b50cSQu Wenruo int ret; 12225767b50cSQu Wenruo 12235767b50cSQu Wenruo again: 12245767b50cSQu Wenruo page = find_or_create_page(mapping, index, mask); 12255767b50cSQu Wenruo if (!page) 12265767b50cSQu Wenruo return ERR_PTR(-ENOMEM); 12275767b50cSQu Wenruo 12285767b50cSQu Wenruo ret = set_page_extent_mapped(page); 12295767b50cSQu Wenruo if (ret < 0) { 12305767b50cSQu Wenruo unlock_page(page); 12315767b50cSQu Wenruo put_page(page); 12325767b50cSQu Wenruo return ERR_PTR(ret); 12335767b50cSQu Wenruo } 12345767b50cSQu Wenruo 12355767b50cSQu Wenruo /* Wait for any existing ordered extent in the range */ 12365767b50cSQu Wenruo while (1) { 12375767b50cSQu Wenruo struct btrfs_ordered_extent *ordered; 12385767b50cSQu Wenruo 12395767b50cSQu Wenruo lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); 12405767b50cSQu Wenruo ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); 12415767b50cSQu Wenruo unlock_extent_cached(&inode->io_tree, page_start, page_end, 12425767b50cSQu Wenruo &cached_state); 12435767b50cSQu Wenruo if (!ordered) 12445767b50cSQu Wenruo break; 12455767b50cSQu Wenruo 12465767b50cSQu Wenruo unlock_page(page); 12475767b50cSQu Wenruo btrfs_start_ordered_extent(ordered, 1); 12485767b50cSQu Wenruo btrfs_put_ordered_extent(ordered); 12495767b50cSQu Wenruo lock_page(page); 12505767b50cSQu Wenruo /* 12515767b50cSQu Wenruo * We unlocked the page above, so we need check if it was 12525767b50cSQu Wenruo * released or not. 12535767b50cSQu Wenruo */ 12545767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 12555767b50cSQu Wenruo unlock_page(page); 12565767b50cSQu Wenruo put_page(page); 12575767b50cSQu Wenruo goto again; 12585767b50cSQu Wenruo } 12595767b50cSQu Wenruo } 12605767b50cSQu Wenruo 12615767b50cSQu Wenruo /* 12625767b50cSQu Wenruo * Now the page range has no ordered extent any more. Read the page to 12635767b50cSQu Wenruo * make it uptodate. 12645767b50cSQu Wenruo */ 12655767b50cSQu Wenruo if (!PageUptodate(page)) { 12665767b50cSQu Wenruo btrfs_readpage(NULL, page); 12675767b50cSQu Wenruo lock_page(page); 12685767b50cSQu Wenruo if (page->mapping != mapping || !PagePrivate(page)) { 12695767b50cSQu Wenruo unlock_page(page); 12705767b50cSQu Wenruo put_page(page); 12715767b50cSQu Wenruo goto again; 12725767b50cSQu Wenruo } 12735767b50cSQu Wenruo if (!PageUptodate(page)) { 12745767b50cSQu Wenruo unlock_page(page); 12755767b50cSQu Wenruo put_page(page); 12765767b50cSQu Wenruo return ERR_PTR(-EIO); 12775767b50cSQu Wenruo } 12785767b50cSQu Wenruo } 12795767b50cSQu Wenruo return page; 12805767b50cSQu Wenruo } 12815767b50cSQu Wenruo 12825767b50cSQu Wenruo /* 12834cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12844cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12854cb5300bSChris Mason * to COW and defrag. 12864cb5300bSChris Mason * 12874cb5300bSChris Mason * It also makes sure the delalloc code has enough 12884cb5300bSChris Mason * dirty data to avoid making new small extents as part 12894cb5300bSChris Mason * of the defrag 12904cb5300bSChris Mason * 12914cb5300bSChris Mason * It's a good idea to start RA on this range 12924cb5300bSChris Mason * before calling this. 12934cb5300bSChris Mason */ 12944cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12954cb5300bSChris Mason struct page **pages, 12964cb5300bSChris Mason unsigned long start_index, 1297c41570c9SJustin Maggard unsigned long num_pages) 1298f46b5a66SChristoph Hellwig { 12994cb5300bSChris Mason unsigned long file_end; 13004cb5300bSChris Mason u64 isize = i_size_read(inode); 1301f46b5a66SChristoph Hellwig u64 page_start; 1302f46b5a66SChristoph Hellwig u64 page_end; 13031f12bd06SLiu Bo u64 page_cnt; 1304a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 13057f458a38SFilipe Manana u64 search_start; 13064cb5300bSChris Mason int ret; 13074cb5300bSChris Mason int i; 13084cb5300bSChris Mason int i_done; 13094cb5300bSChris Mason struct extent_state *cached_state = NULL; 1310364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 13114cb5300bSChris Mason 131209cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 13131f12bd06SLiu Bo if (!isize || start_index > file_end) 13141f12bd06SLiu Bo return 0; 13151f12bd06SLiu Bo 13161f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13174cb5300bSChris Mason 1318e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1319a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13204cb5300bSChris Mason if (ret) 13214cb5300bSChris Mason return ret; 13224cb5300bSChris Mason i_done = 0; 13234cb5300bSChris Mason 13244cb5300bSChris Mason /* step one, lock all the pages */ 13251f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13264cb5300bSChris Mason struct page *page; 13274cb5300bSChris Mason 13285767b50cSQu Wenruo page = defrag_prepare_one_page(BTRFS_I(inode), start_index + i); 13295767b50cSQu Wenruo if (IS_ERR(page)) { 13305767b50cSQu Wenruo ret = PTR_ERR(page); 133132443de3SQu Wenruo break; 133232443de3SQu Wenruo } 13334cb5300bSChris Mason pages[i] = page; 13344cb5300bSChris Mason i_done++; 13354cb5300bSChris Mason } 13364cb5300bSChris Mason if (!i_done || ret) 13374cb5300bSChris Mason goto out; 13384cb5300bSChris Mason 13391751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13404cb5300bSChris Mason goto out; 13414cb5300bSChris Mason 13424cb5300bSChris Mason /* 13435767b50cSQu Wenruo * Now we have a nice long stream of locked and up to date pages, let's 13445767b50cSQu Wenruo * wait on them. 13454cb5300bSChris Mason */ 13464cb5300bSChris Mason for (i = 0; i < i_done; i++) 13474cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13484cb5300bSChris Mason 13494cb5300bSChris Mason page_start = page_offset(pages[0]); 135009cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13514cb5300bSChris Mason 13524cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1353ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13547f458a38SFilipe Manana 13557f458a38SFilipe Manana /* 13567f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 13577f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 13587f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 13597f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 13607f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 13617f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 13627f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 13637f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 13647f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 13657f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 13667f458a38SFilipe Manana * out if that happened. 13677f458a38SFilipe Manana */ 13687f458a38SFilipe Manana search_start = page_start; 13697f458a38SFilipe Manana while (search_start < page_end) { 13707f458a38SFilipe Manana struct extent_map *em; 13717f458a38SFilipe Manana 13727f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 13737f458a38SFilipe Manana page_end - search_start); 13747f458a38SFilipe Manana if (IS_ERR(em)) { 13757f458a38SFilipe Manana ret = PTR_ERR(em); 13767f458a38SFilipe Manana goto out_unlock_range; 13777f458a38SFilipe Manana } 13787f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 13797f458a38SFilipe Manana free_extent_map(em); 13807f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 13817f458a38SFilipe Manana ret = 0; 13827f458a38SFilipe Manana goto out_unlock_range; 13837f458a38SFilipe Manana } 13847f458a38SFilipe Manana search_start = extent_map_end(em); 13857f458a38SFilipe Manana free_extent_map(em); 13867f458a38SFilipe Manana } 13877f458a38SFilipe Manana 13884cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1389e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1390e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 13914cb5300bSChris Mason 13921f12bd06SLiu Bo if (i_done != page_cnt) { 13939e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 139428c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 13959e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 139686d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1397a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 13984cb5300bSChris Mason } 13994cb5300bSChris Mason 14004cb5300bSChris Mason 14019e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1402018ed4f7SDavid Sterba &cached_state); 14034cb5300bSChris Mason 14044cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1405e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14064cb5300bSChris Mason 14074cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14084cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14094cb5300bSChris Mason ClearPageChecked(pages[i]); 14104cb5300bSChris Mason set_page_dirty(pages[i]); 14114cb5300bSChris Mason unlock_page(pages[i]); 141209cbfeafSKirill A. Shutemov put_page(pages[i]); 14134cb5300bSChris Mason } 14148702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1415364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14164cb5300bSChris Mason return i_done; 14177f458a38SFilipe Manana 14187f458a38SFilipe Manana out_unlock_range: 14197f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14207f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14214cb5300bSChris Mason out: 14224cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14234cb5300bSChris Mason unlock_page(pages[i]); 142409cbfeafSKirill A. Shutemov put_page(pages[i]); 14254cb5300bSChris Mason } 142686d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1427a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14288702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1429364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14304cb5300bSChris Mason return ret; 14314cb5300bSChris Mason 14324cb5300bSChris Mason } 14334cb5300bSChris Mason 1434*eb793cf8SQu Wenruo struct defrag_target_range { 1435*eb793cf8SQu Wenruo struct list_head list; 1436*eb793cf8SQu Wenruo u64 start; 1437*eb793cf8SQu Wenruo u64 len; 1438*eb793cf8SQu Wenruo }; 1439*eb793cf8SQu Wenruo 1440*eb793cf8SQu Wenruo /* 1441*eb793cf8SQu Wenruo * Collect all valid target extents. 1442*eb793cf8SQu Wenruo * 1443*eb793cf8SQu Wenruo * @start: file offset to lookup 1444*eb793cf8SQu Wenruo * @len: length to lookup 1445*eb793cf8SQu Wenruo * @extent_thresh: file extent size threshold, any extent size >= this value 1446*eb793cf8SQu Wenruo * will be ignored 1447*eb793cf8SQu Wenruo * @newer_than: only defrag extents newer than this value 1448*eb793cf8SQu Wenruo * @do_compress: whether the defrag is doing compression 1449*eb793cf8SQu Wenruo * if true, @extent_thresh will be ignored and all regular 1450*eb793cf8SQu Wenruo * file extents meeting @newer_than will be targets. 1451*eb793cf8SQu Wenruo * @target_list: list of targets file extents 1452*eb793cf8SQu Wenruo */ 1453*eb793cf8SQu Wenruo static int defrag_collect_targets(struct btrfs_inode *inode, 1454*eb793cf8SQu Wenruo u64 start, u64 len, u32 extent_thresh, 1455*eb793cf8SQu Wenruo u64 newer_than, bool do_compress, 1456*eb793cf8SQu Wenruo struct list_head *target_list) 1457*eb793cf8SQu Wenruo { 1458*eb793cf8SQu Wenruo u64 cur = start; 1459*eb793cf8SQu Wenruo int ret = 0; 1460*eb793cf8SQu Wenruo 1461*eb793cf8SQu Wenruo while (cur < start + len) { 1462*eb793cf8SQu Wenruo struct extent_map *em; 1463*eb793cf8SQu Wenruo struct defrag_target_range *new; 1464*eb793cf8SQu Wenruo bool next_mergeable = true; 1465*eb793cf8SQu Wenruo u64 range_len; 1466*eb793cf8SQu Wenruo 1467*eb793cf8SQu Wenruo em = defrag_lookup_extent(&inode->vfs_inode, cur); 1468*eb793cf8SQu Wenruo if (!em) 1469*eb793cf8SQu Wenruo break; 1470*eb793cf8SQu Wenruo 1471*eb793cf8SQu Wenruo /* Skip hole/inline/preallocated extents */ 1472*eb793cf8SQu Wenruo if (em->block_start >= EXTENT_MAP_LAST_BYTE || 1473*eb793cf8SQu Wenruo test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) 1474*eb793cf8SQu Wenruo goto next; 1475*eb793cf8SQu Wenruo 1476*eb793cf8SQu Wenruo /* Skip older extent */ 1477*eb793cf8SQu Wenruo if (em->generation < newer_than) 1478*eb793cf8SQu Wenruo goto next; 1479*eb793cf8SQu Wenruo 1480*eb793cf8SQu Wenruo /* 1481*eb793cf8SQu Wenruo * For do_compress case, we want to compress all valid file 1482*eb793cf8SQu Wenruo * extents, thus no @extent_thresh or mergeable check. 1483*eb793cf8SQu Wenruo */ 1484*eb793cf8SQu Wenruo if (do_compress) 1485*eb793cf8SQu Wenruo goto add; 1486*eb793cf8SQu Wenruo 1487*eb793cf8SQu Wenruo /* Skip too large extent */ 1488*eb793cf8SQu Wenruo if (em->len >= extent_thresh) 1489*eb793cf8SQu Wenruo goto next; 1490*eb793cf8SQu Wenruo 1491*eb793cf8SQu Wenruo next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em); 1492*eb793cf8SQu Wenruo if (!next_mergeable) { 1493*eb793cf8SQu Wenruo struct defrag_target_range *last; 1494*eb793cf8SQu Wenruo 1495*eb793cf8SQu Wenruo /* Empty target list, no way to merge with last entry */ 1496*eb793cf8SQu Wenruo if (list_empty(target_list)) 1497*eb793cf8SQu Wenruo goto next; 1498*eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1499*eb793cf8SQu Wenruo struct defrag_target_range, list); 1500*eb793cf8SQu Wenruo /* Not mergeable with last entry */ 1501*eb793cf8SQu Wenruo if (last->start + last->len != cur) 1502*eb793cf8SQu Wenruo goto next; 1503*eb793cf8SQu Wenruo 1504*eb793cf8SQu Wenruo /* Mergeable, fall through to add it to @target_list. */ 1505*eb793cf8SQu Wenruo } 1506*eb793cf8SQu Wenruo 1507*eb793cf8SQu Wenruo add: 1508*eb793cf8SQu Wenruo range_len = min(extent_map_end(em), start + len) - cur; 1509*eb793cf8SQu Wenruo /* 1510*eb793cf8SQu Wenruo * This one is a good target, check if it can be merged into 1511*eb793cf8SQu Wenruo * last range of the target list. 1512*eb793cf8SQu Wenruo */ 1513*eb793cf8SQu Wenruo if (!list_empty(target_list)) { 1514*eb793cf8SQu Wenruo struct defrag_target_range *last; 1515*eb793cf8SQu Wenruo 1516*eb793cf8SQu Wenruo last = list_entry(target_list->prev, 1517*eb793cf8SQu Wenruo struct defrag_target_range, list); 1518*eb793cf8SQu Wenruo ASSERT(last->start + last->len <= cur); 1519*eb793cf8SQu Wenruo if (last->start + last->len == cur) { 1520*eb793cf8SQu Wenruo /* Mergeable, enlarge the last entry */ 1521*eb793cf8SQu Wenruo last->len += range_len; 1522*eb793cf8SQu Wenruo goto next; 1523*eb793cf8SQu Wenruo } 1524*eb793cf8SQu Wenruo /* Fall through to allocate a new entry */ 1525*eb793cf8SQu Wenruo } 1526*eb793cf8SQu Wenruo 1527*eb793cf8SQu Wenruo /* Allocate new defrag_target_range */ 1528*eb793cf8SQu Wenruo new = kmalloc(sizeof(*new), GFP_NOFS); 1529*eb793cf8SQu Wenruo if (!new) { 1530*eb793cf8SQu Wenruo free_extent_map(em); 1531*eb793cf8SQu Wenruo ret = -ENOMEM; 1532*eb793cf8SQu Wenruo break; 1533*eb793cf8SQu Wenruo } 1534*eb793cf8SQu Wenruo new->start = cur; 1535*eb793cf8SQu Wenruo new->len = range_len; 1536*eb793cf8SQu Wenruo list_add_tail(&new->list, target_list); 1537*eb793cf8SQu Wenruo 1538*eb793cf8SQu Wenruo next: 1539*eb793cf8SQu Wenruo cur = extent_map_end(em); 1540*eb793cf8SQu Wenruo free_extent_map(em); 1541*eb793cf8SQu Wenruo } 1542*eb793cf8SQu Wenruo if (ret < 0) { 1543*eb793cf8SQu Wenruo struct defrag_target_range *entry; 1544*eb793cf8SQu Wenruo struct defrag_target_range *tmp; 1545*eb793cf8SQu Wenruo 1546*eb793cf8SQu Wenruo list_for_each_entry_safe(entry, tmp, target_list, list) { 1547*eb793cf8SQu Wenruo list_del_init(&entry->list); 1548*eb793cf8SQu Wenruo kfree(entry); 1549*eb793cf8SQu Wenruo } 1550*eb793cf8SQu Wenruo } 1551*eb793cf8SQu Wenruo return ret; 1552*eb793cf8SQu Wenruo } 1553*eb793cf8SQu Wenruo 15541ccc2e8aSQu Wenruo /* 15551ccc2e8aSQu Wenruo * Entry point to file defragmentation. 15561ccc2e8aSQu Wenruo * 15571ccc2e8aSQu Wenruo * @inode: inode to be defragged 15581ccc2e8aSQu Wenruo * @ra: readahead state (can be NUL) 15591ccc2e8aSQu Wenruo * @range: defrag options including range and flags 15601ccc2e8aSQu Wenruo * @newer_than: minimum transid to defrag 15611ccc2e8aSQu Wenruo * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode 15621ccc2e8aSQu Wenruo * will be defragged. 15631ccc2e8aSQu Wenruo */ 15641ccc2e8aSQu Wenruo int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, 15654cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 15664cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 15674cb5300bSChris Mason { 15680b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 15694cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 15704cb5300bSChris Mason unsigned long last_index; 1571151a31b2SLi Zefan u64 isize = i_size_read(inode); 1572940100a4SChris Mason u64 last_len = 0; 1573940100a4SChris Mason u64 skip = 0; 1574940100a4SChris Mason u64 defrag_end = 0; 15754cb5300bSChris Mason u64 newer_off = range->start; 1576f46b5a66SChristoph Hellwig unsigned long i; 1577008873eaSLi Zefan unsigned long ra_index = 0; 1578f46b5a66SChristoph Hellwig int ret; 15794cb5300bSChris Mason int defrag_count = 0; 15801a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1581aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 158209cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1583c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1584ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 15854cb5300bSChris Mason struct page **pages = NULL; 15861e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 15871ccc2e8aSQu Wenruo bool ra_allocated = false; 15884cb5300bSChris Mason 15890abd5b17SLiu Bo if (isize == 0) 15900abd5b17SLiu Bo return 0; 15910abd5b17SLiu Bo 15920abd5b17SLiu Bo if (range->start >= isize) 15930abd5b17SLiu Bo return -EINVAL; 15941a419d85SLi Zefan 15951e2ef46dSDavid Sterba if (do_compress) { 1596ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 15971a419d85SLi Zefan return -EINVAL; 15981a419d85SLi Zefan if (range->compress_type) 15991a419d85SLi Zefan compress_type = range->compress_type; 16001a419d85SLi Zefan } 1601f46b5a66SChristoph Hellwig 16020abd5b17SLiu Bo if (extent_thresh == 0) 1603ee22184bSByongho Lee extent_thresh = SZ_256K; 1604f46b5a66SChristoph Hellwig 16054cb5300bSChris Mason /* 16061ccc2e8aSQu Wenruo * If we were not given a ra, allocate a readahead context. As 16070a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 16080a52d108SDavid Sterba * we don't error out. 16094cb5300bSChris Mason */ 16101ccc2e8aSQu Wenruo if (!ra) { 16111ccc2e8aSQu Wenruo ra_allocated = true; 161263e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 16130a52d108SDavid Sterba if (ra) 16144cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 16154cb5300bSChris Mason } 16164cb5300bSChris Mason 161763e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 16184cb5300bSChris Mason if (!pages) { 16194cb5300bSChris Mason ret = -ENOMEM; 16204cb5300bSChris Mason goto out_ra; 16214cb5300bSChris Mason } 16224cb5300bSChris Mason 16234cb5300bSChris Mason /* find the last page to defrag */ 16241e701a32SChris Mason if (range->start + range->len > range->start) { 1625151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 162609cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 16271e701a32SChris Mason } else { 162809cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 16291e701a32SChris Mason } 16301e701a32SChris Mason 16314cb5300bSChris Mason if (newer_than) { 16324cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1633ee22184bSByongho Lee &newer_off, SZ_64K); 16344cb5300bSChris Mason if (!ret) { 16354cb5300bSChris Mason range->start = newer_off; 16364cb5300bSChris Mason /* 16374cb5300bSChris Mason * we always align our defrag to help keep 16384cb5300bSChris Mason * the extents in the file evenly spaced 16394cb5300bSChris Mason */ 164009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16414cb5300bSChris Mason } else 16424cb5300bSChris Mason goto out_ra; 16434cb5300bSChris Mason } else { 164409cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 16454cb5300bSChris Mason } 16464cb5300bSChris Mason if (!max_to_defrag) 1647070034bdSchandan max_to_defrag = last_index - i + 1; 16484cb5300bSChris Mason 16492a0f7f57SLi Zefan /* 16502a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 16512a0f7f57SLi Zefan * written sequentially. 16522a0f7f57SLi Zefan */ 16532a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 16542a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 16552a0f7f57SLi Zefan 1656f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 165709cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 16584cb5300bSChris Mason /* 16594cb5300bSChris Mason * make sure we stop running if someone unmounts 16604cb5300bSChris Mason * the FS 16614cb5300bSChris Mason */ 16621751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 16634cb5300bSChris Mason break; 16644cb5300bSChris Mason 16650b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 16660b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1667210549ebSDavid Sterba ret = -EAGAIN; 166850535db8STian Tao goto error; 1669210549ebSDavid Sterba } 1670210549ebSDavid Sterba 167109cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 16726c282eb4SLi Zefan extent_thresh, &last_len, &skip, 16731e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1674940100a4SChris Mason unsigned long next; 1675940100a4SChris Mason /* 1676940100a4SChris Mason * the should_defrag function tells us how much to skip 1677940100a4SChris Mason * bump our counter by the suggested amount 1678940100a4SChris Mason */ 167909cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1680940100a4SChris Mason i = max(i + 1, next); 1681940100a4SChris Mason continue; 1682940100a4SChris Mason } 1683008873eaSLi Zefan 1684008873eaSLi Zefan if (!newer_than) { 168509cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 168609cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1687008873eaSLi Zefan cluster = min(cluster, max_cluster); 1688008873eaSLi Zefan } else { 1689008873eaSLi Zefan cluster = max_cluster; 1690008873eaSLi Zefan } 1691008873eaSLi Zefan 1692008873eaSLi Zefan if (i + cluster > ra_index) { 1693008873eaSLi Zefan ra_index = max(i, ra_index); 16940a52d108SDavid Sterba if (ra) 1695d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 16961ccc2e8aSQu Wenruo NULL, ra_index, cluster); 1697e4826a5bSchandan ra_index += cluster; 1698008873eaSLi Zefan } 16994cb5300bSChris Mason 170064708539SJosef Bacik btrfs_inode_lock(inode, 0); 1701eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1702eede2bf3SOmar Sandoval ret = -ETXTBSY; 1703eede2bf3SOmar Sandoval } else { 17041e2ef46dSDavid Sterba if (do_compress) 1705eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1706008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1707eede2bf3SOmar Sandoval } 1708ecb8bea8SLiu Bo if (ret < 0) { 170964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 17104cb5300bSChris Mason goto out_ra; 1711ecb8bea8SLiu Bo } 17124cb5300bSChris Mason 17134cb5300bSChris Mason defrag_count += ret; 1714d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 171564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 17164cb5300bSChris Mason 17174cb5300bSChris Mason if (newer_than) { 17184cb5300bSChris Mason if (newer_off == (u64)-1) 17194cb5300bSChris Mason break; 17204cb5300bSChris Mason 1721e1f041e1SLiu Bo if (ret > 0) 1722e1f041e1SLiu Bo i += ret; 1723e1f041e1SLiu Bo 17244cb5300bSChris Mason newer_off = max(newer_off + 1, 172509cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 17264cb5300bSChris Mason 1727ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1728ee22184bSByongho Lee &newer_off, SZ_64K); 17294cb5300bSChris Mason if (!ret) { 17304cb5300bSChris Mason range->start = newer_off; 173109cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 17324cb5300bSChris Mason } else { 17334cb5300bSChris Mason break; 1734940100a4SChris Mason } 17354cb5300bSChris Mason } else { 1736008873eaSLi Zefan if (ret > 0) { 1737cbcc8326SLi Zefan i += ret; 173809cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1739008873eaSLi Zefan } else { 1740940100a4SChris Mason i++; 1741008873eaSLi Zefan last_len = 0; 1742008873eaSLi Zefan } 1743f46b5a66SChristoph Hellwig } 17444cb5300bSChris Mason } 1745f46b5a66SChristoph Hellwig 174650535db8STian Tao ret = defrag_count; 174750535db8STian Tao error: 1748dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 17491e701a32SChris Mason filemap_flush(inode->i_mapping); 1750dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1751dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1752dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1753dec8ef90SFilipe Manana } 17541e701a32SChris Mason 17551a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 17560b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 17575c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 17585c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 17591a419d85SLi Zefan } 17601a419d85SLi Zefan 17614cb5300bSChris Mason out_ra: 17621e2ef46dSDavid Sterba if (do_compress) { 176364708539SJosef Bacik btrfs_inode_lock(inode, 0); 1764eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 176564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1766633085c7SFilipe David Borba Manana } 17671ccc2e8aSQu Wenruo if (ra_allocated) 17684cb5300bSChris Mason kfree(ra); 17694cb5300bSChris Mason kfree(pages); 1770940100a4SChris Mason return ret; 1771f46b5a66SChristoph Hellwig } 1772f46b5a66SChristoph Hellwig 177317aaa434SDavid Sterba /* 177417aaa434SDavid Sterba * Try to start exclusive operation @type or cancel it if it's running. 177517aaa434SDavid Sterba * 177617aaa434SDavid Sterba * Return: 177717aaa434SDavid Sterba * 0 - normal mode, newly claimed op started 177817aaa434SDavid Sterba * >0 - normal mode, something else is running, 177917aaa434SDavid Sterba * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space 178017aaa434SDavid Sterba * ECANCELED - cancel mode, successful cancel 178117aaa434SDavid Sterba * ENOTCONN - cancel mode, operation not running anymore 178217aaa434SDavid Sterba */ 178317aaa434SDavid Sterba static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, 178417aaa434SDavid Sterba enum btrfs_exclusive_operation type, bool cancel) 178517aaa434SDavid Sterba { 178617aaa434SDavid Sterba if (!cancel) { 178717aaa434SDavid Sterba /* Start normal op */ 178817aaa434SDavid Sterba if (!btrfs_exclop_start(fs_info, type)) 178917aaa434SDavid Sterba return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 179017aaa434SDavid Sterba /* Exclusive operation is now claimed */ 179117aaa434SDavid Sterba return 0; 179217aaa434SDavid Sterba } 179317aaa434SDavid Sterba 179417aaa434SDavid Sterba /* Cancel running op */ 179517aaa434SDavid Sterba if (btrfs_exclop_start_try_lock(fs_info, type)) { 179617aaa434SDavid Sterba /* 179717aaa434SDavid Sterba * This blocks any exclop finish from setting it to NONE, so we 179817aaa434SDavid Sterba * request cancellation. Either it runs and we will wait for it, 179917aaa434SDavid Sterba * or it has finished and no waiting will happen. 180017aaa434SDavid Sterba */ 180117aaa434SDavid Sterba atomic_inc(&fs_info->reloc_cancel_req); 180217aaa434SDavid Sterba btrfs_exclop_start_unlock(fs_info); 180317aaa434SDavid Sterba 180417aaa434SDavid Sterba if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) 180517aaa434SDavid Sterba wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, 180617aaa434SDavid Sterba TASK_INTERRUPTIBLE); 180717aaa434SDavid Sterba 180817aaa434SDavid Sterba return -ECANCELED; 180917aaa434SDavid Sterba } 181017aaa434SDavid Sterba 181117aaa434SDavid Sterba /* Something else is running or none */ 181217aaa434SDavid Sterba return -ENOTCONN; 181317aaa434SDavid Sterba } 181417aaa434SDavid Sterba 1815198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 181676dda93cSYan, Zheng void __user *arg) 1817f46b5a66SChristoph Hellwig { 18180b246afaSJeff Mahoney struct inode *inode = file_inode(file); 18190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1820f46b5a66SChristoph Hellwig u64 new_size; 1821f46b5a66SChristoph Hellwig u64 old_size; 1822f46b5a66SChristoph Hellwig u64 devid = 1; 18230b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1824f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1825f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1826f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1827f46b5a66SChristoph Hellwig char *sizestr; 18289a40f122SGui Hecheng char *retptr; 1829f46b5a66SChristoph Hellwig char *devstr = NULL; 1830f46b5a66SChristoph Hellwig int ret = 0; 1831f46b5a66SChristoph Hellwig int mod = 0; 1832bb059a37SDavid Sterba bool cancel; 1833f46b5a66SChristoph Hellwig 1834e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1835e441d54dSChris Mason return -EPERM; 1836e441d54dSChris Mason 1837198605a8SMiao Xie ret = mnt_want_write_file(file); 1838198605a8SMiao Xie if (ret) 1839198605a8SMiao Xie return ret; 1840198605a8SMiao Xie 1841bb059a37SDavid Sterba /* 1842bb059a37SDavid Sterba * Read the arguments before checking exclusivity to be able to 1843bb059a37SDavid Sterba * distinguish regular resize and cancel 1844bb059a37SDavid Sterba */ 1845dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1846c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1847c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1848bb059a37SDavid Sterba goto out_drop; 1849c9e9f97bSIlya Dryomov } 18505516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1851f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1852bb059a37SDavid Sterba cancel = (strcmp("cancel", sizestr) == 0); 1853bb059a37SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); 1854bb059a37SDavid Sterba if (ret) 1855bb059a37SDavid Sterba goto out_free; 1856bb059a37SDavid Sterba /* Exclusive operation is now claimed */ 1857bb059a37SDavid Sterba 1858f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1859f46b5a66SChristoph Hellwig if (devstr) { 1860f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1861f46b5a66SChristoph Hellwig *devstr = '\0'; 1862f46b5a66SChristoph Hellwig devstr = vol_args->name; 186358dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 186458dfae63SZhangZhen if (ret) 1865bb059a37SDavid Sterba goto out_finish; 1866dfd79829SMiao Xie if (!devid) { 1867dfd79829SMiao Xie ret = -EINVAL; 1868bb059a37SDavid Sterba goto out_finish; 1869dfd79829SMiao Xie } 18700b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1871f46b5a66SChristoph Hellwig } 1872dba60f3fSMiao Xie 1873b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1874f46b5a66SChristoph Hellwig if (!device) { 18750b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1876c1c9ff7cSGeert Uytterhoeven devid); 1877dfd79829SMiao Xie ret = -ENODEV; 1878bb059a37SDavid Sterba goto out_finish; 1879f46b5a66SChristoph Hellwig } 1880dba60f3fSMiao Xie 1881ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 18820b246afaSJeff Mahoney btrfs_info(fs_info, 1883efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1884c1c9ff7cSGeert Uytterhoeven devid); 1885dfd79829SMiao Xie ret = -EPERM; 1886bb059a37SDavid Sterba goto out_finish; 18874e42ae1bSLiu Bo } 18884e42ae1bSLiu Bo 1889f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1890f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1891f46b5a66SChristoph Hellwig else { 1892f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1893f46b5a66SChristoph Hellwig mod = -1; 1894f46b5a66SChristoph Hellwig sizestr++; 1895f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1896f46b5a66SChristoph Hellwig mod = 1; 1897f46b5a66SChristoph Hellwig sizestr++; 1898f46b5a66SChristoph Hellwig } 18999a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 19009a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1901f46b5a66SChristoph Hellwig ret = -EINVAL; 1902bb059a37SDavid Sterba goto out_finish; 1903f46b5a66SChristoph Hellwig } 1904f46b5a66SChristoph Hellwig } 1905f46b5a66SChristoph Hellwig 1906401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1907dfd79829SMiao Xie ret = -EPERM; 1908bb059a37SDavid Sterba goto out_finish; 190963a212abSStefan Behrens } 191063a212abSStefan Behrens 19117cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1912f46b5a66SChristoph Hellwig 1913f46b5a66SChristoph Hellwig if (mod < 0) { 1914f46b5a66SChristoph Hellwig if (new_size > old_size) { 1915f46b5a66SChristoph Hellwig ret = -EINVAL; 1916bb059a37SDavid Sterba goto out_finish; 1917f46b5a66SChristoph Hellwig } 1918f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1919f46b5a66SChristoph Hellwig } else if (mod > 0) { 1920eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1921902c68a4SGui Hecheng ret = -ERANGE; 1922bb059a37SDavid Sterba goto out_finish; 1923eb8052e0SWenliang Fan } 1924f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1925f46b5a66SChristoph Hellwig } 1926f46b5a66SChristoph Hellwig 1927ee22184bSByongho Lee if (new_size < SZ_256M) { 1928f46b5a66SChristoph Hellwig ret = -EINVAL; 1929bb059a37SDavid Sterba goto out_finish; 1930f46b5a66SChristoph Hellwig } 1931f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1932f46b5a66SChristoph Hellwig ret = -EFBIG; 1933bb059a37SDavid Sterba goto out_finish; 1934f46b5a66SChristoph Hellwig } 1935f46b5a66SChristoph Hellwig 193647f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1937f46b5a66SChristoph Hellwig 1938f46b5a66SChristoph Hellwig if (new_size > old_size) { 1939a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 194098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 194198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1942bb059a37SDavid Sterba goto out_finish; 194398d5dc13STsutomu Itoh } 1944f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 19453a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1946ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1947f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 19480253f40eSjeff.liu } /* equal, nothing need to do */ 1949f46b5a66SChristoph Hellwig 1950faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1951faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1952faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1953faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1954faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1955bb059a37SDavid Sterba out_finish: 1956bb059a37SDavid Sterba btrfs_exclop_finish(fs_info); 1957c9e9f97bSIlya Dryomov out_free: 1958f46b5a66SChristoph Hellwig kfree(vol_args); 1959bb059a37SDavid Sterba out_drop: 196018f39c41SIlya Dryomov mnt_drop_write_file(file); 1961f46b5a66SChristoph Hellwig return ret; 1962f46b5a66SChristoph Hellwig } 1963f46b5a66SChristoph Hellwig 19645d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 19654d4340c9SChristian Brauner struct user_namespace *mnt_userns, 196652f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 19675d54c67eSNikolay Borisov bool readonly, 19688696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1969f46b5a66SChristoph Hellwig { 1970f46b5a66SChristoph Hellwig int namelen; 19713de4586cSChris Mason int ret = 0; 1972f46b5a66SChristoph Hellwig 1973325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1974325c50e3SJeff Mahoney return -ENOTDIR; 1975325c50e3SJeff Mahoney 1976a874a63eSLiu Bo ret = mnt_want_write_file(file); 1977a874a63eSLiu Bo if (ret) 1978a874a63eSLiu Bo goto out; 1979a874a63eSLiu Bo 198072fd032eSSage Weil namelen = strlen(name); 198172fd032eSSage Weil if (strchr(name, '/')) { 1982f46b5a66SChristoph Hellwig ret = -EINVAL; 1983a874a63eSLiu Bo goto out_drop_write; 1984f46b5a66SChristoph Hellwig } 1985f46b5a66SChristoph Hellwig 198616780cabSChris Mason if (name[0] == '.' && 198716780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 198816780cabSChris Mason ret = -EEXIST; 1989a874a63eSLiu Bo goto out_drop_write; 199016780cabSChris Mason } 199116780cabSChris Mason 19923de4586cSChris Mason if (subvol) { 19934d4340c9SChristian Brauner ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, 19944d4340c9SChristian Brauner namelen, NULL, readonly, inherit); 1995cb8e7090SChristoph Hellwig } else { 19962903ff01SAl Viro struct fd src = fdget(fd); 19973de4586cSChris Mason struct inode *src_inode; 19982903ff01SAl Viro if (!src.file) { 19993de4586cSChris Mason ret = -EINVAL; 2000a874a63eSLiu Bo goto out_drop_write; 20013de4586cSChris Mason } 20023de4586cSChris Mason 2003496ad9aaSAl Viro src_inode = file_inode(src.file); 2004496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 2005c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 2006efe120a0SFrank Holton "Snapshot src from another FS"); 200723ad5b17SKusanagi Kouichi ret = -EXDEV; 20084d4340c9SChristian Brauner } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { 2009d0242061SDavid Sterba /* 2010d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 2011d0242061SDavid Sterba * are limited to own subvolumes only 2012d0242061SDavid Sterba */ 2013d0242061SDavid Sterba ret = -EPERM; 2014ecd18815SAl Viro } else { 20154d4340c9SChristian Brauner ret = btrfs_mksnapshot(&file->f_path, mnt_userns, 20164d4340c9SChristian Brauner name, namelen, 201772fd032eSSage Weil BTRFS_I(src_inode)->root, 20185d54c67eSNikolay Borisov readonly, inherit); 2019ecd18815SAl Viro } 20202903ff01SAl Viro fdput(src); 2021cb8e7090SChristoph Hellwig } 2022a874a63eSLiu Bo out_drop_write: 2023a874a63eSLiu Bo mnt_drop_write_file(file); 2024f46b5a66SChristoph Hellwig out: 202572fd032eSSage Weil return ret; 202672fd032eSSage Weil } 202772fd032eSSage Weil 202872fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 2029fa0d2b9bSLi Zefan void __user *arg, int subvol) 203072fd032eSSage Weil { 2031fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 203272fd032eSSage Weil int ret; 203372fd032eSSage Weil 2034325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2035325c50e3SJeff Mahoney return -ENOTDIR; 2036325c50e3SJeff Mahoney 2037fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2038fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2039fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2040fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 2041fa0d2b9bSLi Zefan 20424d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 20434d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 20444d4340c9SChristian Brauner false, NULL); 2045fa0d2b9bSLi Zefan 2046fa0d2b9bSLi Zefan kfree(vol_args); 2047fa0d2b9bSLi Zefan return ret; 2048fa0d2b9bSLi Zefan } 2049fa0d2b9bSLi Zefan 2050fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 2051fa0d2b9bSLi Zefan void __user *arg, int subvol) 2052fa0d2b9bSLi Zefan { 2053fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 2054fa0d2b9bSLi Zefan int ret; 2055b83cc969SLi Zefan bool readonly = false; 20566f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 205772fd032eSSage Weil 2058325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 2059325c50e3SJeff Mahoney return -ENOTDIR; 2060325c50e3SJeff Mahoney 2061fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 2062fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 2063fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 2064fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 2065fdfb1e4fSLi Zefan 2066673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 2067b83cc969SLi Zefan ret = -EOPNOTSUPP; 2068c47ca32dSDan Carpenter goto free_args; 2069fdfb1e4fSLi Zefan } 2070fdfb1e4fSLi Zefan 2071b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 2072b83cc969SLi Zefan readonly = true; 20736f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 20745011c5a6SDan Carpenter u64 nums; 20755011c5a6SDan Carpenter 20765011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 20775011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 20786f72c7e2SArne Jansen ret = -EINVAL; 2079c47ca32dSDan Carpenter goto free_args; 20806f72c7e2SArne Jansen } 20816f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 20826f72c7e2SArne Jansen if (IS_ERR(inherit)) { 20836f72c7e2SArne Jansen ret = PTR_ERR(inherit); 2084c47ca32dSDan Carpenter goto free_args; 20856f72c7e2SArne Jansen } 20865011c5a6SDan Carpenter 20875011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 20885011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 20895011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 20905011c5a6SDan Carpenter ret = -EINVAL; 20915011c5a6SDan Carpenter goto free_inherit; 20925011c5a6SDan Carpenter } 20935011c5a6SDan Carpenter 20945011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 20955011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 20965011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 20975011c5a6SDan Carpenter ret = -EINVAL; 20985011c5a6SDan Carpenter goto free_inherit; 20995011c5a6SDan Carpenter } 21006f72c7e2SArne Jansen } 210175eaa0e2SSage Weil 21024d4340c9SChristian Brauner ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), 21034d4340c9SChristian Brauner vol_args->name, vol_args->fd, subvol, 21044d4340c9SChristian Brauner readonly, inherit); 2105c47ca32dSDan Carpenter if (ret) 2106c47ca32dSDan Carpenter goto free_inherit; 2107c47ca32dSDan Carpenter free_inherit: 21086f72c7e2SArne Jansen kfree(inherit); 2109c47ca32dSDan Carpenter free_args: 2110c47ca32dSDan Carpenter kfree(vol_args); 2111f46b5a66SChristoph Hellwig return ret; 2112f46b5a66SChristoph Hellwig } 2113f46b5a66SChristoph Hellwig 21140caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 21150caa102dSLi Zefan void __user *arg) 21160caa102dSLi Zefan { 2117496ad9aaSAl Viro struct inode *inode = file_inode(file); 21180b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 21190caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 21200caa102dSLi Zefan int ret = 0; 21210caa102dSLi Zefan u64 flags = 0; 21220caa102dSLi Zefan 21234a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 21240caa102dSLi Zefan return -EINVAL; 21250caa102dSLi Zefan 21260b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 21270caa102dSLi Zefan if (btrfs_root_readonly(root)) 21280caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 21290b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 21300caa102dSLi Zefan 21310caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 21320caa102dSLi Zefan ret = -EFAULT; 21330caa102dSLi Zefan 21340caa102dSLi Zefan return ret; 21350caa102dSLi Zefan } 21360caa102dSLi Zefan 21370caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 21380caa102dSLi Zefan void __user *arg) 21390caa102dSLi Zefan { 2140496ad9aaSAl Viro struct inode *inode = file_inode(file); 21410b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 21420caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 21430caa102dSLi Zefan struct btrfs_trans_handle *trans; 21440caa102dSLi Zefan u64 root_flags; 21450caa102dSLi Zefan u64 flags; 21460caa102dSLi Zefan int ret = 0; 21470caa102dSLi Zefan 214839e1674fSChristian Brauner if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) 2149bd60ea0fSDavid Sterba return -EPERM; 2150bd60ea0fSDavid Sterba 2151b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2152b9ca0664SLiu Bo if (ret) 2153b9ca0664SLiu Bo goto out; 21540caa102dSLi Zefan 21554a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2156b9ca0664SLiu Bo ret = -EINVAL; 2157b9ca0664SLiu Bo goto out_drop_write; 2158b9ca0664SLiu Bo } 21590caa102dSLi Zefan 2160b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2161b9ca0664SLiu Bo ret = -EFAULT; 2162b9ca0664SLiu Bo goto out_drop_write; 2163b9ca0664SLiu Bo } 21640caa102dSLi Zefan 2165b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2166b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2167b9ca0664SLiu Bo goto out_drop_write; 2168b9ca0664SLiu Bo } 21690caa102dSLi Zefan 21700b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 21710caa102dSLi Zefan 21720caa102dSLi Zefan /* nothing to do */ 21730caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2174b9ca0664SLiu Bo goto out_drop_sem; 21750caa102dSLi Zefan 21760caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 21772c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 21780caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 21790caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 21802c686537SDavid Sterba } else { 21812c686537SDavid Sterba /* 21822c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 21832c686537SDavid Sterba * send 21842c686537SDavid Sterba */ 21852c686537SDavid Sterba spin_lock(&root->root_item_lock); 21862c686537SDavid Sterba if (root->send_in_progress == 0) { 21870caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 21880caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 21892c686537SDavid Sterba spin_unlock(&root->root_item_lock); 21902c686537SDavid Sterba } else { 21912c686537SDavid Sterba spin_unlock(&root->root_item_lock); 21920b246afaSJeff Mahoney btrfs_warn(fs_info, 21932c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 21942c686537SDavid Sterba root->root_key.objectid); 21952c686537SDavid Sterba ret = -EPERM; 21962c686537SDavid Sterba goto out_drop_sem; 21972c686537SDavid Sterba } 21982c686537SDavid Sterba } 21990caa102dSLi Zefan 22000caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 22010caa102dSLi Zefan if (IS_ERR(trans)) { 22020caa102dSLi Zefan ret = PTR_ERR(trans); 22030caa102dSLi Zefan goto out_reset; 22040caa102dSLi Zefan } 22050caa102dSLi Zefan 22060b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 22070caa102dSLi Zefan &root->root_key, &root->root_item); 22089417ebc8SNikolay Borisov if (ret < 0) { 22099417ebc8SNikolay Borisov btrfs_end_transaction(trans); 22109417ebc8SNikolay Borisov goto out_reset; 22119417ebc8SNikolay Borisov } 22120caa102dSLi Zefan 22139417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 22149417ebc8SNikolay Borisov 22150caa102dSLi Zefan out_reset: 22160caa102dSLi Zefan if (ret) 22170caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2218b9ca0664SLiu Bo out_drop_sem: 22190b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2220b9ca0664SLiu Bo out_drop_write: 2221b9ca0664SLiu Bo mnt_drop_write_file(file); 2222b9ca0664SLiu Bo out: 22230caa102dSLi Zefan return ret; 22240caa102dSLi Zefan } 22250caa102dSLi Zefan 2226ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2227ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2228ac8e9819SChris Mason { 2229abc6e134SChris Mason struct btrfs_key test; 2230abc6e134SChris Mason int ret; 2231abc6e134SChris Mason 2232abc6e134SChris Mason test.objectid = sk->min_objectid; 2233abc6e134SChris Mason test.type = sk->min_type; 2234abc6e134SChris Mason test.offset = sk->min_offset; 2235abc6e134SChris Mason 2236abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2237abc6e134SChris Mason if (ret < 0) 2238ac8e9819SChris Mason return 0; 2239abc6e134SChris Mason 2240abc6e134SChris Mason test.objectid = sk->max_objectid; 2241abc6e134SChris Mason test.type = sk->max_type; 2242abc6e134SChris Mason test.offset = sk->max_offset; 2243abc6e134SChris Mason 2244abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2245abc6e134SChris Mason if (ret > 0) 2246ac8e9819SChris Mason return 0; 2247ac8e9819SChris Mason return 1; 2248ac8e9819SChris Mason } 2249ac8e9819SChris Mason 2250df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2251ac8e9819SChris Mason struct btrfs_key *key, 2252ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 22539b6e817dSGerhard Heift size_t *buf_size, 2254ba346b35SGerhard Heift char __user *ubuf, 2255ac8e9819SChris Mason unsigned long *sk_offset, 2256ac8e9819SChris Mason int *num_found) 2257ac8e9819SChris Mason { 2258ac8e9819SChris Mason u64 found_transid; 2259ac8e9819SChris Mason struct extent_buffer *leaf; 2260ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2261dd81d459SNaohiro Aota struct btrfs_key test; 2262ac8e9819SChris Mason unsigned long item_off; 2263ac8e9819SChris Mason unsigned long item_len; 2264ac8e9819SChris Mason int nritems; 2265ac8e9819SChris Mason int i; 2266ac8e9819SChris Mason int slot; 2267ac8e9819SChris Mason int ret = 0; 2268ac8e9819SChris Mason 2269ac8e9819SChris Mason leaf = path->nodes[0]; 2270ac8e9819SChris Mason slot = path->slots[0]; 2271ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2272ac8e9819SChris Mason 2273ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2274ac8e9819SChris Mason i = nritems; 2275ac8e9819SChris Mason goto advance_key; 2276ac8e9819SChris Mason } 2277ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2278ac8e9819SChris Mason 2279ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2280ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2281ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2282ac8e9819SChris Mason 228303b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 228403b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 228503b71c6cSGabriel de Perthuis continue; 228603b71c6cSGabriel de Perthuis 22879b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 22888f5f6178SGerhard Heift if (*num_found) { 2289ac8e9819SChris Mason ret = 1; 22908f5f6178SGerhard Heift goto out; 22918f5f6178SGerhard Heift } 22928f5f6178SGerhard Heift 22938f5f6178SGerhard Heift /* 22948f5f6178SGerhard Heift * return one empty item back for v1, which does not 22958f5f6178SGerhard Heift * handle -EOVERFLOW 22968f5f6178SGerhard Heift */ 22978f5f6178SGerhard Heift 22989b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2299ac8e9819SChris Mason item_len = 0; 23008f5f6178SGerhard Heift ret = -EOVERFLOW; 23018f5f6178SGerhard Heift } 2302ac8e9819SChris Mason 23039b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2304ac8e9819SChris Mason ret = 1; 230525c9bc2eSGerhard Heift goto out; 2306ac8e9819SChris Mason } 2307ac8e9819SChris Mason 2308ac8e9819SChris Mason sh.objectid = key->objectid; 2309ac8e9819SChris Mason sh.offset = key->offset; 2310ac8e9819SChris Mason sh.type = key->type; 2311ac8e9819SChris Mason sh.len = item_len; 2312ac8e9819SChris Mason sh.transid = found_transid; 2313ac8e9819SChris Mason 2314a48b73ecSJosef Bacik /* 2315a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2316a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2317a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2318a48b73ecSJosef Bacik * properly this next time through 2319a48b73ecSJosef Bacik */ 2320a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2321a48b73ecSJosef Bacik ret = 0; 2322ba346b35SGerhard Heift goto out; 2323ba346b35SGerhard Heift } 2324ba346b35SGerhard Heift 2325ac8e9819SChris Mason *sk_offset += sizeof(sh); 2326ac8e9819SChris Mason 2327ac8e9819SChris Mason if (item_len) { 2328ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2329a48b73ecSJosef Bacik /* 2330a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2331a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2332a48b73ecSJosef Bacik */ 2333a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2334ba346b35SGerhard Heift item_off, item_len)) { 2335a48b73ecSJosef Bacik ret = 0; 2336a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2337ba346b35SGerhard Heift goto out; 2338ba346b35SGerhard Heift } 2339ba346b35SGerhard Heift 2340ac8e9819SChris Mason *sk_offset += item_len; 2341ac8e9819SChris Mason } 2342e2156867SHugo Mills (*num_found)++; 2343ac8e9819SChris Mason 23448f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 23458f5f6178SGerhard Heift goto out; 23468f5f6178SGerhard Heift 234725c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 234825c9bc2eSGerhard Heift ret = 1; 234925c9bc2eSGerhard Heift goto out; 235025c9bc2eSGerhard Heift } 2351ac8e9819SChris Mason } 2352ac8e9819SChris Mason advance_key: 2353ac8e9819SChris Mason ret = 0; 2354dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2355dd81d459SNaohiro Aota test.type = sk->max_type; 2356dd81d459SNaohiro Aota test.offset = sk->max_offset; 2357dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2358dd81d459SNaohiro Aota ret = 1; 2359dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2360abc6e134SChris Mason key->offset++; 2361dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2362abc6e134SChris Mason key->offset = 0; 2363abc6e134SChris Mason key->type++; 2364dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2365abc6e134SChris Mason key->offset = 0; 2366abc6e134SChris Mason key->type = 0; 2367abc6e134SChris Mason key->objectid++; 2368abc6e134SChris Mason } else 2369abc6e134SChris Mason ret = 1; 237025c9bc2eSGerhard Heift out: 2371ba346b35SGerhard Heift /* 2372ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2373ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2374ba346b35SGerhard Heift * * all items were found 2375ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2376ba346b35SGerhard Heift * leaf 2377ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2378ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2379ba346b35SGerhard Heift */ 2380ac8e9819SChris Mason return ret; 2381ac8e9819SChris Mason } 2382ac8e9819SChris Mason 2383ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 238412544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 23859b6e817dSGerhard Heift size_t *buf_size, 2386ba346b35SGerhard Heift char __user *ubuf) 2387ac8e9819SChris Mason { 23880b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2389ac8e9819SChris Mason struct btrfs_root *root; 2390ac8e9819SChris Mason struct btrfs_key key; 2391ac8e9819SChris Mason struct btrfs_path *path; 2392ac8e9819SChris Mason int ret; 2393ac8e9819SChris Mason int num_found = 0; 2394ac8e9819SChris Mason unsigned long sk_offset = 0; 2395ac8e9819SChris Mason 23969b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 23979b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 239812544442SGerhard Heift return -EOVERFLOW; 23999b6e817dSGerhard Heift } 240012544442SGerhard Heift 2401ac8e9819SChris Mason path = btrfs_alloc_path(); 2402ac8e9819SChris Mason if (!path) 2403ac8e9819SChris Mason return -ENOMEM; 2404ac8e9819SChris Mason 2405ac8e9819SChris Mason if (sk->tree_id == 0) { 2406ac8e9819SChris Mason /* search the root of the inode that was passed */ 240700246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2408ac8e9819SChris Mason } else { 240956e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2410ac8e9819SChris Mason if (IS_ERR(root)) { 2411ac8e9819SChris Mason btrfs_free_path(path); 2412ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2413ac8e9819SChris Mason } 2414ac8e9819SChris Mason } 2415ac8e9819SChris Mason 2416ac8e9819SChris Mason key.objectid = sk->min_objectid; 2417ac8e9819SChris Mason key.type = sk->min_type; 2418ac8e9819SChris Mason key.offset = sk->min_offset; 2419ac8e9819SChris Mason 2420ac8e9819SChris Mason while (1) { 24211c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 24221c78544eSFilipe Manana *buf_size - sk_offset); 2423a48b73ecSJosef Bacik if (ret) 2424a48b73ecSJosef Bacik break; 2425a48b73ecSJosef Bacik 24266174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2427ac8e9819SChris Mason if (ret != 0) { 2428ac8e9819SChris Mason if (ret > 0) 2429ac8e9819SChris Mason ret = 0; 2430ac8e9819SChris Mason goto err; 2431ac8e9819SChris Mason } 2432df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2433ac8e9819SChris Mason &sk_offset, &num_found); 2434b3b4aa74SDavid Sterba btrfs_release_path(path); 243525c9bc2eSGerhard Heift if (ret) 2436ac8e9819SChris Mason break; 2437ac8e9819SChris Mason 2438ac8e9819SChris Mason } 24398f5f6178SGerhard Heift if (ret > 0) 2440ac8e9819SChris Mason ret = 0; 2441ac8e9819SChris Mason err: 2442ac8e9819SChris Mason sk->nr_items = num_found; 244300246528SJosef Bacik btrfs_put_root(root); 2444ac8e9819SChris Mason btrfs_free_path(path); 2445ac8e9819SChris Mason return ret; 2446ac8e9819SChris Mason } 2447ac8e9819SChris Mason 2448ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2449ac8e9819SChris Mason void __user *argp) 2450ac8e9819SChris Mason { 2451ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2452ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2453ac8e9819SChris Mason struct inode *inode; 2454ac8e9819SChris Mason int ret; 24559b6e817dSGerhard Heift size_t buf_size; 2456ac8e9819SChris Mason 2457ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2458ac8e9819SChris Mason return -EPERM; 2459ac8e9819SChris Mason 2460ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2461ac8e9819SChris Mason 2462ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2463ba346b35SGerhard Heift return -EFAULT; 2464ba346b35SGerhard Heift 2465ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2466ac8e9819SChris Mason 2467496ad9aaSAl Viro inode = file_inode(file); 2468ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 24698f5f6178SGerhard Heift 24708f5f6178SGerhard Heift /* 24718f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 24728f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 24738f5f6178SGerhard Heift */ 24748f5f6178SGerhard Heift if (ret == -EOVERFLOW) 24758f5f6178SGerhard Heift ret = 0; 24768f5f6178SGerhard Heift 2477ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2478ac8e9819SChris Mason ret = -EFAULT; 2479ac8e9819SChris Mason return ret; 2480ac8e9819SChris Mason } 2481ac8e9819SChris Mason 2482cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2483cc68a8a5SGerhard Heift void __user *argp) 2484cc68a8a5SGerhard Heift { 2485cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2486cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2487cc68a8a5SGerhard Heift struct inode *inode; 2488cc68a8a5SGerhard Heift int ret; 2489cc68a8a5SGerhard Heift size_t buf_size; 2490ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2491cc68a8a5SGerhard Heift 2492cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2493cc68a8a5SGerhard Heift return -EPERM; 2494cc68a8a5SGerhard Heift 2495cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2496cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2497cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2498cc68a8a5SGerhard Heift return -EFAULT; 2499cc68a8a5SGerhard Heift 2500cc68a8a5SGerhard Heift buf_size = args.buf_size; 2501cc68a8a5SGerhard Heift 2502cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2503cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2504cc68a8a5SGerhard Heift buf_size = buf_limit; 2505cc68a8a5SGerhard Heift 2506cc68a8a5SGerhard Heift inode = file_inode(file); 2507cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2508718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2509cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2510cc68a8a5SGerhard Heift ret = -EFAULT; 2511cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2512cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2513cc68a8a5SGerhard Heift ret = -EFAULT; 2514cc68a8a5SGerhard Heift 251576dda93cSYan, Zheng return ret; 251676dda93cSYan, Zheng } 251776dda93cSYan, Zheng 251898d377a0STARUISI Hiroaki /* 2519ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2520ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 252198d377a0STARUISI Hiroaki */ 252298d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 252398d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 252498d377a0STARUISI Hiroaki { 252598d377a0STARUISI Hiroaki struct btrfs_root *root; 252698d377a0STARUISI Hiroaki struct btrfs_key key; 2527ac8e9819SChris Mason char *ptr; 252898d377a0STARUISI Hiroaki int ret = -1; 252998d377a0STARUISI Hiroaki int slot; 253098d377a0STARUISI Hiroaki int len; 253198d377a0STARUISI Hiroaki int total_len = 0; 253298d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 253398d377a0STARUISI Hiroaki struct extent_buffer *l; 253498d377a0STARUISI Hiroaki struct btrfs_path *path; 253598d377a0STARUISI Hiroaki 253698d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 253798d377a0STARUISI Hiroaki name[0]='\0'; 253898d377a0STARUISI Hiroaki return 0; 253998d377a0STARUISI Hiroaki } 254098d377a0STARUISI Hiroaki 254198d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 254298d377a0STARUISI Hiroaki if (!path) 254398d377a0STARUISI Hiroaki return -ENOMEM; 254498d377a0STARUISI Hiroaki 2545c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 254698d377a0STARUISI Hiroaki 254756e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 254898d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2549ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 255088234012SJosef Bacik root = NULL; 255188234012SJosef Bacik goto out; 255288234012SJosef Bacik } 255398d377a0STARUISI Hiroaki 255498d377a0STARUISI Hiroaki key.objectid = dirid; 255598d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 25568ad6fcabSChris Mason key.offset = (u64)-1; 255798d377a0STARUISI Hiroaki 255898d377a0STARUISI Hiroaki while (1) { 25590ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 256018674c6cSFilipe David Borba Manana if (ret < 0) 256118674c6cSFilipe David Borba Manana goto out; 256218674c6cSFilipe David Borba Manana else if (ret > 0) { 2563ac8e9819SChris Mason ret = -ENOENT; 256498d377a0STARUISI Hiroaki goto out; 2565ac8e9819SChris Mason } 256618674c6cSFilipe David Borba Manana 256718674c6cSFilipe David Borba Manana l = path->nodes[0]; 256818674c6cSFilipe David Borba Manana slot = path->slots[0]; 256998d377a0STARUISI Hiroaki 257098d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 257198d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 257298d377a0STARUISI Hiroaki ptr -= len + 1; 257398d377a0STARUISI Hiroaki total_len += len + 1; 2574a696cf35SFilipe David Borba Manana if (ptr < name) { 2575a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 257698d377a0STARUISI Hiroaki goto out; 2577a696cf35SFilipe David Borba Manana } 257898d377a0STARUISI Hiroaki 257998d377a0STARUISI Hiroaki *(ptr + len) = '/'; 258098d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 258198d377a0STARUISI Hiroaki 258298d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 258398d377a0STARUISI Hiroaki break; 258498d377a0STARUISI Hiroaki 2585b3b4aa74SDavid Sterba btrfs_release_path(path); 258698d377a0STARUISI Hiroaki key.objectid = key.offset; 25878ad6fcabSChris Mason key.offset = (u64)-1; 258898d377a0STARUISI Hiroaki dirid = key.objectid; 258998d377a0STARUISI Hiroaki } 259077906a50SLi Zefan memmove(name, ptr, total_len); 259198d377a0STARUISI Hiroaki name[total_len] = '\0'; 259298d377a0STARUISI Hiroaki ret = 0; 259398d377a0STARUISI Hiroaki out: 259400246528SJosef Bacik btrfs_put_root(root); 259598d377a0STARUISI Hiroaki btrfs_free_path(path); 2596ac8e9819SChris Mason return ret; 2597ac8e9819SChris Mason } 2598ac8e9819SChris Mason 25996623d9a0SChristian Brauner static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, 26006623d9a0SChristian Brauner struct inode *inode, 260123d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 260223d0b79dSTomohiro Misono { 260323d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 260423d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 260523d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 260623d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 260723d0b79dSTomohiro Misono u64 dirid = args->dirid; 260823d0b79dSTomohiro Misono unsigned long item_off; 260923d0b79dSTomohiro Misono unsigned long item_len; 261023d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 261123d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2612b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 261323d0b79dSTomohiro Misono struct btrfs_path *path; 261423d0b79dSTomohiro Misono struct btrfs_key key, key2; 261523d0b79dSTomohiro Misono struct extent_buffer *leaf; 261623d0b79dSTomohiro Misono struct inode *temp_inode; 261723d0b79dSTomohiro Misono char *ptr; 261823d0b79dSTomohiro Misono int slot; 261923d0b79dSTomohiro Misono int len; 262023d0b79dSTomohiro Misono int total_len = 0; 262123d0b79dSTomohiro Misono int ret; 262223d0b79dSTomohiro Misono 262323d0b79dSTomohiro Misono path = btrfs_alloc_path(); 262423d0b79dSTomohiro Misono if (!path) 262523d0b79dSTomohiro Misono return -ENOMEM; 262623d0b79dSTomohiro Misono 262723d0b79dSTomohiro Misono /* 262823d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 262923d0b79dSTomohiro Misono * construct the path in from the bottom up. 263023d0b79dSTomohiro Misono */ 263123d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 263223d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 263323d0b79dSTomohiro Misono 263456e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 263523d0b79dSTomohiro Misono if (IS_ERR(root)) { 263623d0b79dSTomohiro Misono ret = PTR_ERR(root); 263723d0b79dSTomohiro Misono goto out; 263823d0b79dSTomohiro Misono } 263923d0b79dSTomohiro Misono 264023d0b79dSTomohiro Misono key.objectid = dirid; 264123d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 264223d0b79dSTomohiro Misono key.offset = (u64)-1; 264323d0b79dSTomohiro Misono while (1) { 26440ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 26450ff40a91SMarcos Paulo de Souza if (ret < 0) 2646b8a49ae1SJosef Bacik goto out_put; 26470ff40a91SMarcos Paulo de Souza else if (ret > 0) { 264823d0b79dSTomohiro Misono ret = -ENOENT; 2649b8a49ae1SJosef Bacik goto out_put; 265023d0b79dSTomohiro Misono } 265123d0b79dSTomohiro Misono 265223d0b79dSTomohiro Misono leaf = path->nodes[0]; 265323d0b79dSTomohiro Misono slot = path->slots[0]; 265423d0b79dSTomohiro Misono 265523d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 265623d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 265723d0b79dSTomohiro Misono ptr -= len + 1; 265823d0b79dSTomohiro Misono total_len += len + 1; 265923d0b79dSTomohiro Misono if (ptr < args->path) { 266023d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2661b8a49ae1SJosef Bacik goto out_put; 266223d0b79dSTomohiro Misono } 266323d0b79dSTomohiro Misono 266423d0b79dSTomohiro Misono *(ptr + len) = '/'; 266523d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 266623d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 266723d0b79dSTomohiro Misono 266823d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 266923d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 267023d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 267123d0b79dSTomohiro Misono if (ret < 0) { 2672b8a49ae1SJosef Bacik goto out_put; 267323d0b79dSTomohiro Misono } else if (ret > 0) { 267423d0b79dSTomohiro Misono ret = -ENOENT; 2675b8a49ae1SJosef Bacik goto out_put; 267623d0b79dSTomohiro Misono } 267723d0b79dSTomohiro Misono 267823d0b79dSTomohiro Misono leaf = path->nodes[0]; 267923d0b79dSTomohiro Misono slot = path->slots[0]; 268023d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 268123d0b79dSTomohiro Misono if (key2.objectid != dirid) { 268223d0b79dSTomohiro Misono ret = -ENOENT; 2683b8a49ae1SJosef Bacik goto out_put; 268423d0b79dSTomohiro Misono } 268523d0b79dSTomohiro Misono 26860202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 26873ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 26883ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2689b8a49ae1SJosef Bacik goto out_put; 26903ca57bd6SMisono Tomohiro } 26916623d9a0SChristian Brauner ret = inode_permission(mnt_userns, temp_inode, 269247291baaSChristian Brauner MAY_READ | MAY_EXEC); 269323d0b79dSTomohiro Misono iput(temp_inode); 269423d0b79dSTomohiro Misono if (ret) { 269523d0b79dSTomohiro Misono ret = -EACCES; 2696b8a49ae1SJosef Bacik goto out_put; 269723d0b79dSTomohiro Misono } 269823d0b79dSTomohiro Misono 269923d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 270023d0b79dSTomohiro Misono break; 270123d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 270223d0b79dSTomohiro Misono ret = -EACCES; 2703b8a49ae1SJosef Bacik goto out_put; 270423d0b79dSTomohiro Misono } 270523d0b79dSTomohiro Misono 270623d0b79dSTomohiro Misono btrfs_release_path(path); 270723d0b79dSTomohiro Misono key.objectid = key.offset; 270823d0b79dSTomohiro Misono key.offset = (u64)-1; 270923d0b79dSTomohiro Misono dirid = key.objectid; 271023d0b79dSTomohiro Misono } 271123d0b79dSTomohiro Misono 271223d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 271323d0b79dSTomohiro Misono args->path[total_len] = '\0'; 271400246528SJosef Bacik btrfs_put_root(root); 2715b8a49ae1SJosef Bacik root = NULL; 271623d0b79dSTomohiro Misono btrfs_release_path(path); 271723d0b79dSTomohiro Misono } 271823d0b79dSTomohiro Misono 271923d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 272023d0b79dSTomohiro Misono key.objectid = treeid; 272123d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 272223d0b79dSTomohiro Misono key.offset = args->treeid; 2723b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 272423d0b79dSTomohiro Misono if (ret < 0) { 272523d0b79dSTomohiro Misono goto out; 272623d0b79dSTomohiro Misono } else if (ret > 0) { 272723d0b79dSTomohiro Misono ret = -ENOENT; 272823d0b79dSTomohiro Misono goto out; 272923d0b79dSTomohiro Misono } 273023d0b79dSTomohiro Misono 273123d0b79dSTomohiro Misono leaf = path->nodes[0]; 273223d0b79dSTomohiro Misono slot = path->slots[0]; 273323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 273423d0b79dSTomohiro Misono 273523d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 273623d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 273723d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 273823d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 273923d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 274023d0b79dSTomohiro Misono ret = -EINVAL; 274123d0b79dSTomohiro Misono goto out; 274223d0b79dSTomohiro Misono } 274323d0b79dSTomohiro Misono 274423d0b79dSTomohiro Misono /* Copy subvolume's name */ 274523d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 274623d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 274723d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 274823d0b79dSTomohiro Misono args->name[item_len] = 0; 274923d0b79dSTomohiro Misono 2750b8a49ae1SJosef Bacik out_put: 275100246528SJosef Bacik btrfs_put_root(root); 275223d0b79dSTomohiro Misono out: 275323d0b79dSTomohiro Misono btrfs_free_path(path); 275423d0b79dSTomohiro Misono return ret; 275523d0b79dSTomohiro Misono } 275623d0b79dSTomohiro Misono 2757ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2758ac8e9819SChris Mason void __user *argp) 2759ac8e9819SChris Mason { 2760ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2761ac8e9819SChris Mason struct inode *inode; 276201b810b8SDavid Sterba int ret = 0; 2763ac8e9819SChris Mason 27642354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 27652354d08fSJulia Lawall if (IS_ERR(args)) 27662354d08fSJulia Lawall return PTR_ERR(args); 2767c2b96929SDan Carpenter 2768496ad9aaSAl Viro inode = file_inode(file); 2769ac8e9819SChris Mason 277001b810b8SDavid Sterba /* 277101b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 277201b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 277301b810b8SDavid Sterba */ 27741b53ac4dSChris Mason if (args->treeid == 0) 27751b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 27761b53ac4dSChris Mason 277701b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 277801b810b8SDavid Sterba args->name[0] = 0; 277901b810b8SDavid Sterba goto out; 278001b810b8SDavid Sterba } 278101b810b8SDavid Sterba 278201b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 278301b810b8SDavid Sterba ret = -EPERM; 278401b810b8SDavid Sterba goto out; 278501b810b8SDavid Sterba } 278601b810b8SDavid Sterba 2787ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2788ac8e9819SChris Mason args->treeid, args->objectid, 2789ac8e9819SChris Mason args->name); 2790ac8e9819SChris Mason 279101b810b8SDavid Sterba out: 2792ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2793ac8e9819SChris Mason ret = -EFAULT; 2794ac8e9819SChris Mason 2795ac8e9819SChris Mason kfree(args); 279698d377a0STARUISI Hiroaki return ret; 279798d377a0STARUISI Hiroaki } 279898d377a0STARUISI Hiroaki 279923d0b79dSTomohiro Misono /* 280023d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 280123d0b79dSTomohiro Misono * 280223d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 280323d0b79dSTomohiro Misono * 280423d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 280523d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 280623d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 280723d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 280823d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 280923d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 281023d0b79dSTomohiro Misono */ 281123d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 281223d0b79dSTomohiro Misono { 281323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 281423d0b79dSTomohiro Misono struct inode *inode; 281523d0b79dSTomohiro Misono int ret; 281623d0b79dSTomohiro Misono 281723d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 281823d0b79dSTomohiro Misono if (IS_ERR(args)) 281923d0b79dSTomohiro Misono return PTR_ERR(args); 282023d0b79dSTomohiro Misono 282123d0b79dSTomohiro Misono inode = file_inode(file); 282223d0b79dSTomohiro Misono 282323d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 282423d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 282523d0b79dSTomohiro Misono /* 282623d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 282723d0b79dSTomohiro Misono * called 282823d0b79dSTomohiro Misono */ 282923d0b79dSTomohiro Misono kfree(args); 283023d0b79dSTomohiro Misono return -EACCES; 283123d0b79dSTomohiro Misono } 283223d0b79dSTomohiro Misono 28336623d9a0SChristian Brauner ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); 283423d0b79dSTomohiro Misono 283523d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 283623d0b79dSTomohiro Misono ret = -EFAULT; 283723d0b79dSTomohiro Misono 283823d0b79dSTomohiro Misono kfree(args); 283923d0b79dSTomohiro Misono return ret; 284023d0b79dSTomohiro Misono } 284123d0b79dSTomohiro Misono 2842b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2843b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2844b64ec075STomohiro Misono { 2845b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2846b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2847b64ec075STomohiro Misono struct btrfs_root *root; 2848b64ec075STomohiro Misono struct btrfs_path *path; 2849b64ec075STomohiro Misono struct btrfs_key key; 2850b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2851b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2852b64ec075STomohiro Misono struct extent_buffer *leaf; 2853b64ec075STomohiro Misono unsigned long item_off; 2854b64ec075STomohiro Misono unsigned long item_len; 2855b64ec075STomohiro Misono struct inode *inode; 2856b64ec075STomohiro Misono int slot; 2857b64ec075STomohiro Misono int ret = 0; 2858b64ec075STomohiro Misono 2859b64ec075STomohiro Misono path = btrfs_alloc_path(); 2860b64ec075STomohiro Misono if (!path) 2861b64ec075STomohiro Misono return -ENOMEM; 2862b64ec075STomohiro Misono 2863b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2864b64ec075STomohiro Misono if (!subvol_info) { 2865b64ec075STomohiro Misono btrfs_free_path(path); 2866b64ec075STomohiro Misono return -ENOMEM; 2867b64ec075STomohiro Misono } 2868b64ec075STomohiro Misono 2869b64ec075STomohiro Misono inode = file_inode(file); 2870b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2871b64ec075STomohiro Misono 2872b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2873b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 287456e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2875b64ec075STomohiro Misono if (IS_ERR(root)) { 2876b64ec075STomohiro Misono ret = PTR_ERR(root); 287704734e84SJosef Bacik goto out_free; 287804734e84SJosef Bacik } 2879b64ec075STomohiro Misono root_item = &root->root_item; 2880b64ec075STomohiro Misono 2881b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2882b64ec075STomohiro Misono 2883b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2884b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2885b64ec075STomohiro Misono 2886b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2887b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2888b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2889b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2890b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2891b64ec075STomohiro Misono 2892b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2893b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2894b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2895b64ec075STomohiro Misono 2896b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2897b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2898b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2899b64ec075STomohiro Misono 2900b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2901b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2902b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2903b64ec075STomohiro Misono 2904b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2905b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2906b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2907b64ec075STomohiro Misono 2908b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2909b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2910b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2911b64ec075STomohiro Misono key.offset = 0; 291204734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2913b64ec075STomohiro Misono if (ret < 0) { 2914b64ec075STomohiro Misono goto out; 2915b64ec075STomohiro Misono } else if (path->slots[0] >= 2916b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 291704734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2918b64ec075STomohiro Misono if (ret < 0) { 2919b64ec075STomohiro Misono goto out; 2920b64ec075STomohiro Misono } else if (ret > 0) { 2921b64ec075STomohiro Misono ret = -EUCLEAN; 2922b64ec075STomohiro Misono goto out; 2923b64ec075STomohiro Misono } 2924b64ec075STomohiro Misono } 2925b64ec075STomohiro Misono 2926b64ec075STomohiro Misono leaf = path->nodes[0]; 2927b64ec075STomohiro Misono slot = path->slots[0]; 2928b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2929b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2930b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2931b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2932b64ec075STomohiro Misono 2933b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2934b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2935b64ec075STomohiro Misono 2936b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2937b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2938b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2939b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2940b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2941b64ec075STomohiro Misono item_off, item_len); 2942b64ec075STomohiro Misono } else { 2943b64ec075STomohiro Misono ret = -ENOENT; 2944b64ec075STomohiro Misono goto out; 2945b64ec075STomohiro Misono } 2946b64ec075STomohiro Misono } 2947b64ec075STomohiro Misono 2948b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2949b64ec075STomohiro Misono ret = -EFAULT; 2950b64ec075STomohiro Misono 2951b64ec075STomohiro Misono out: 295200246528SJosef Bacik btrfs_put_root(root); 295304734e84SJosef Bacik out_free: 2954b64ec075STomohiro Misono btrfs_free_path(path); 2955b091f7feSWaiman Long kfree(subvol_info); 2956b64ec075STomohiro Misono return ret; 2957b64ec075STomohiro Misono } 2958b64ec075STomohiro Misono 295942e4b520STomohiro Misono /* 296042e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 296142e4b520STomohiro Misono * except the subvolume name. 296242e4b520STomohiro Misono */ 296342e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 296442e4b520STomohiro Misono { 296542e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 296642e4b520STomohiro Misono struct btrfs_root_ref *rref; 296742e4b520STomohiro Misono struct btrfs_root *root; 296842e4b520STomohiro Misono struct btrfs_path *path; 296942e4b520STomohiro Misono struct btrfs_key key; 297042e4b520STomohiro Misono struct extent_buffer *leaf; 297142e4b520STomohiro Misono struct inode *inode; 297242e4b520STomohiro Misono u64 objectid; 297342e4b520STomohiro Misono int slot; 297442e4b520STomohiro Misono int ret; 297542e4b520STomohiro Misono u8 found; 297642e4b520STomohiro Misono 297742e4b520STomohiro Misono path = btrfs_alloc_path(); 297842e4b520STomohiro Misono if (!path) 297942e4b520STomohiro Misono return -ENOMEM; 298042e4b520STomohiro Misono 298142e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 298242e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 298342e4b520STomohiro Misono btrfs_free_path(path); 298442e4b520STomohiro Misono return PTR_ERR(rootrefs); 298542e4b520STomohiro Misono } 298642e4b520STomohiro Misono 298742e4b520STomohiro Misono inode = file_inode(file); 298842e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 298942e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 299042e4b520STomohiro Misono 299142e4b520STomohiro Misono key.objectid = objectid; 299242e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 299342e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 299442e4b520STomohiro Misono found = 0; 299542e4b520STomohiro Misono 299642e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 299742e4b520STomohiro Misono if (ret < 0) { 299842e4b520STomohiro Misono goto out; 299942e4b520STomohiro Misono } else if (path->slots[0] >= 300042e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 300142e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 300242e4b520STomohiro Misono if (ret < 0) { 300342e4b520STomohiro Misono goto out; 300442e4b520STomohiro Misono } else if (ret > 0) { 300542e4b520STomohiro Misono ret = -EUCLEAN; 300642e4b520STomohiro Misono goto out; 300742e4b520STomohiro Misono } 300842e4b520STomohiro Misono } 300942e4b520STomohiro Misono while (1) { 301042e4b520STomohiro Misono leaf = path->nodes[0]; 301142e4b520STomohiro Misono slot = path->slots[0]; 301242e4b520STomohiro Misono 301342e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 301442e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 301542e4b520STomohiro Misono ret = 0; 301642e4b520STomohiro Misono goto out; 301742e4b520STomohiro Misono } 301842e4b520STomohiro Misono 301942e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 302042e4b520STomohiro Misono ret = -EOVERFLOW; 302142e4b520STomohiro Misono goto out; 302242e4b520STomohiro Misono } 302342e4b520STomohiro Misono 302442e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 302542e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 302642e4b520STomohiro Misono rootrefs->rootref[found].dirid = 302742e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 302842e4b520STomohiro Misono found++; 302942e4b520STomohiro Misono 303042e4b520STomohiro Misono ret = btrfs_next_item(root, path); 303142e4b520STomohiro Misono if (ret < 0) { 303242e4b520STomohiro Misono goto out; 303342e4b520STomohiro Misono } else if (ret > 0) { 303442e4b520STomohiro Misono ret = -EUCLEAN; 303542e4b520STomohiro Misono goto out; 303642e4b520STomohiro Misono } 303742e4b520STomohiro Misono } 303842e4b520STomohiro Misono 303942e4b520STomohiro Misono out: 304042e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 304142e4b520STomohiro Misono rootrefs->num_items = found; 304242e4b520STomohiro Misono /* update min_treeid for next search */ 304342e4b520STomohiro Misono if (found) 304442e4b520STomohiro Misono rootrefs->min_treeid = 304542e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 304642e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 304742e4b520STomohiro Misono ret = -EFAULT; 304842e4b520STomohiro Misono } 304942e4b520STomohiro Misono 305042e4b520STomohiro Misono kfree(rootrefs); 305142e4b520STomohiro Misono btrfs_free_path(path); 305242e4b520STomohiro Misono 305342e4b520STomohiro Misono return ret; 305442e4b520STomohiro Misono } 305542e4b520STomohiro Misono 305676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 3057949964c9SMarcos Paulo de Souza void __user *arg, 3058949964c9SMarcos Paulo de Souza bool destroy_v2) 305976dda93cSYan, Zheng { 306054563d41SAl Viro struct dentry *parent = file->f_path.dentry; 30610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 306276dda93cSYan, Zheng struct dentry *dentry; 30632b0143b5SDavid Howells struct inode *dir = d_inode(parent); 306476dda93cSYan, Zheng struct inode *inode; 306576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 306676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 3067949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 3068949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 3069c4ed533bSChristian Brauner struct user_namespace *mnt_userns = file_mnt_user_ns(file); 3070949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 3071949964c9SMarcos Paulo de Souza int subvol_namelen; 307276dda93cSYan, Zheng int err = 0; 3073949964c9SMarcos Paulo de Souza bool destroy_parent = false; 307476dda93cSYan, Zheng 3075949964c9SMarcos Paulo de Souza if (destroy_v2) { 3076949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 3077949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 3078949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 3079325c50e3SJeff Mahoney 3080949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 3081949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 3082949964c9SMarcos Paulo de Souza goto out; 3083949964c9SMarcos Paulo de Souza } 308476dda93cSYan, Zheng 3085949964c9SMarcos Paulo de Souza /* 3086949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 3087949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 3088949964c9SMarcos Paulo de Souza */ 3089949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 3090949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 3091949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 3092949964c9SMarcos Paulo de Souza 3093949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3094949964c9SMarcos Paulo de Souza if (err) 3095949964c9SMarcos Paulo de Souza goto out; 3096949964c9SMarcos Paulo de Souza } else { 3097aabb34e7SChristian Brauner struct inode *old_dir; 3098c4ed533bSChristian Brauner 3099949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 310076dda93cSYan, Zheng err = -EINVAL; 310176dda93cSYan, Zheng goto out; 310276dda93cSYan, Zheng } 310376dda93cSYan, Zheng 3104a561be71SAl Viro err = mnt_want_write_file(file); 310576dda93cSYan, Zheng if (err) 310676dda93cSYan, Zheng goto out; 310776dda93cSYan, Zheng 3108949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3109949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3110949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3111949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3112949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3113949964c9SMarcos Paulo de Souza goto out_drop_write; 3114949964c9SMarcos Paulo de Souza } 3115949964c9SMarcos Paulo de Souza 3116949964c9SMarcos Paulo de Souza /* 3117949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3118949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3119949964c9SMarcos Paulo de Souza */ 3120949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3121949964c9SMarcos Paulo de Souza 3122949964c9SMarcos Paulo de Souza /* 3123949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3124949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3125949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3126949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3127949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3128949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3129949964c9SMarcos Paulo de Souza */ 3130949964c9SMarcos Paulo de Souza dput(dentry); 3131949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3132949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3133949964c9SMarcos Paulo de Souza goto out_drop_write; 3134949964c9SMarcos Paulo de Souza } 3135aabb34e7SChristian Brauner old_dir = dir; 3136949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3137949964c9SMarcos Paulo de Souza 3138949964c9SMarcos Paulo de Souza /* 3139949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3140949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3141949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3142949964c9SMarcos Paulo de Souza * new parent dentry. 3143949964c9SMarcos Paulo de Souza */ 3144949964c9SMarcos Paulo de Souza destroy_parent = true; 3145949964c9SMarcos Paulo de Souza 3146aabb34e7SChristian Brauner /* 3147aabb34e7SChristian Brauner * On idmapped mounts, deletion via subvolid is 3148aabb34e7SChristian Brauner * restricted to subvolumes that are immediate 3149aabb34e7SChristian Brauner * ancestors of the inode referenced by the file 3150aabb34e7SChristian Brauner * descriptor in the ioctl. Otherwise the idmapping 3151aabb34e7SChristian Brauner * could potentially be abused to delete subvolumes 3152aabb34e7SChristian Brauner * anywhere in the filesystem the user wouldn't be able 3153aabb34e7SChristian Brauner * to delete without an idmapped mount. 3154aabb34e7SChristian Brauner */ 3155aabb34e7SChristian Brauner if (old_dir != dir && mnt_userns != &init_user_ns) { 3156aabb34e7SChristian Brauner err = -EOPNOTSUPP; 3157aabb34e7SChristian Brauner goto free_parent; 3158aabb34e7SChristian Brauner } 3159aabb34e7SChristian Brauner 3160949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3161949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3162949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3163949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3164949964c9SMarcos Paulo de Souza goto free_parent; 3165949964c9SMarcos Paulo de Souza } 31661a9fd417SDavid Sterba /* subvol_name_ptr is already nul terminated */ 3167949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3168949964c9SMarcos Paulo de Souza } 3169949964c9SMarcos Paulo de Souza } else { 3170949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3171949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3172949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3173949964c9SMarcos Paulo de Souza 3174949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3175949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3176949964c9SMarcos Paulo de Souza 3177949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3178949964c9SMarcos Paulo de Souza if (err) 3179949964c9SMarcos Paulo de Souza goto out; 3180949964c9SMarcos Paulo de Souza } 3181949964c9SMarcos Paulo de Souza 3182949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3183949964c9SMarcos Paulo de Souza 3184949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3185949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3186949964c9SMarcos Paulo de Souza err = -EINVAL; 3187949964c9SMarcos Paulo de Souza goto free_subvol_name; 3188949964c9SMarcos Paulo de Souza } 3189949964c9SMarcos Paulo de Souza 3190949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3191949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3192949964c9SMarcos Paulo de Souza goto free_subvol_name; 3193949964c9SMarcos Paulo de Souza } 3194521e0546SDavid Sterba 319500235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 319600235411SAl Viro if (err == -EINTR) 3197949964c9SMarcos Paulo de Souza goto free_subvol_name; 3198c4ed533bSChristian Brauner dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); 319976dda93cSYan, Zheng if (IS_ERR(dentry)) { 320076dda93cSYan, Zheng err = PTR_ERR(dentry); 320176dda93cSYan, Zheng goto out_unlock_dir; 320276dda93cSYan, Zheng } 320376dda93cSYan, Zheng 32042b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 320576dda93cSYan, Zheng err = -ENOENT; 320676dda93cSYan, Zheng goto out_dput; 320776dda93cSYan, Zheng } 320876dda93cSYan, Zheng 32092b0143b5SDavid Howells inode = d_inode(dentry); 32104260f7c7SSage Weil dest = BTRFS_I(inode)->root; 32114260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 32124260f7c7SSage Weil /* 32134260f7c7SSage Weil * Regular user. Only allow this with a special mount 32144260f7c7SSage Weil * option, when the user has write+exec access to the 32154260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 32164260f7c7SSage Weil * allowed. 32174260f7c7SSage Weil * 32184260f7c7SSage Weil * Note that this is _not_ check that the subvol is 32194260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 32204260f7c7SSage Weil * otherwise be able to delete. 32214260f7c7SSage Weil * 32224260f7c7SSage Weil * Users who want to delete empty subvols should try 32234260f7c7SSage Weil * rmdir(2). 32244260f7c7SSage Weil */ 32254260f7c7SSage Weil err = -EPERM; 32260b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 32274260f7c7SSage Weil goto out_dput; 32284260f7c7SSage Weil 32294260f7c7SSage Weil /* 32304260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 32314260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 32324260f7c7SSage Weil * must be called on the dentry referencing the root 32334260f7c7SSage Weil * of the subvol, not a random directory contained 32344260f7c7SSage Weil * within it. 32354260f7c7SSage Weil */ 32364260f7c7SSage Weil err = -EINVAL; 32374260f7c7SSage Weil if (root == dest) 32384260f7c7SSage Weil goto out_dput; 32394260f7c7SSage Weil 3240c4ed533bSChristian Brauner err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); 32414260f7c7SSage Weil if (err) 32424260f7c7SSage Weil goto out_dput; 32435c39da5bSMiao Xie } 32444260f7c7SSage Weil 32455c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 3246c4ed533bSChristian Brauner err = btrfs_may_delete(mnt_userns, dir, dentry, 1); 32474260f7c7SSage Weil if (err) 32484260f7c7SSage Weil goto out_dput; 32494260f7c7SSage Weil 32504a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 325176dda93cSYan, Zheng err = -EINVAL; 325276dda93cSYan, Zheng goto out_dput; 325376dda93cSYan, Zheng } 325476dda93cSYan, Zheng 325564708539SJosef Bacik btrfs_inode_lock(inode, 0); 3256f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 325764708539SJosef Bacik btrfs_inode_unlock(inode, 0); 325846008d9dSAmir Goldstein if (!err) { 325946008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 326076dda93cSYan, Zheng d_delete(dentry); 326146008d9dSAmir Goldstein } 3262fa6ac876SLiu Bo 326376dda93cSYan, Zheng out_dput: 326476dda93cSYan, Zheng dput(dentry); 326576dda93cSYan, Zheng out_unlock_dir: 326664708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3267949964c9SMarcos Paulo de Souza free_subvol_name: 3268949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3269949964c9SMarcos Paulo de Souza free_parent: 3270949964c9SMarcos Paulo de Souza if (destroy_parent) 3271949964c9SMarcos Paulo de Souza dput(parent); 327200235411SAl Viro out_drop_write: 32732a79f17eSAl Viro mnt_drop_write_file(file); 327476dda93cSYan, Zheng out: 3275949964c9SMarcos Paulo de Souza kfree(vol_args2); 327676dda93cSYan, Zheng kfree(vol_args); 327776dda93cSYan, Zheng return err; 327876dda93cSYan, Zheng } 327976dda93cSYan, Zheng 32801e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3281f46b5a66SChristoph Hellwig { 3282496ad9aaSAl Viro struct inode *inode = file_inode(file); 3283f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 3284c853a578SGoldwyn Rodrigues struct btrfs_ioctl_defrag_range_args range = {0}; 3285c146afadSYan Zheng int ret; 3286c146afadSYan Zheng 328725122d15SIlya Dryomov ret = mnt_want_write_file(file); 328825122d15SIlya Dryomov if (ret) 328925122d15SIlya Dryomov return ret; 3290b83cc969SLi Zefan 329125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 329225122d15SIlya Dryomov ret = -EROFS; 329325122d15SIlya Dryomov goto out; 32945ac00addSStefan Behrens } 3295f46b5a66SChristoph Hellwig 329695ea0486SQu Wenruo /* Subpage defrag will be supported in later commits */ 329795ea0486SQu Wenruo if (root->fs_info->sectorsize < PAGE_SIZE) { 329895ea0486SQu Wenruo ret = -ENOTTY; 329995ea0486SQu Wenruo goto out; 330095ea0486SQu Wenruo } 330195ea0486SQu Wenruo 3302f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3303f46b5a66SChristoph Hellwig case S_IFDIR: 3304e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3305e441d54dSChris Mason ret = -EPERM; 3306e441d54dSChris Mason goto out; 3307e441d54dSChris Mason } 3308de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3309f46b5a66SChristoph Hellwig break; 3310f46b5a66SChristoph Hellwig case S_IFREG: 3311616d374eSAdam Borowski /* 3312616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3313616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3314616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3315616d374eSAdam Borowski */ 3316616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 331747291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3318616d374eSAdam Borowski ret = -EPERM; 3319e441d54dSChris Mason goto out; 3320e441d54dSChris Mason } 33211e701a32SChris Mason 33221e701a32SChris Mason if (argp) { 3323c853a578SGoldwyn Rodrigues if (copy_from_user(&range, argp, sizeof(range))) { 33241e701a32SChris Mason ret = -EFAULT; 3325683be16eSDan Carpenter goto out; 33261e701a32SChris Mason } 33271e701a32SChris Mason /* compression requires us to start the IO */ 3328c853a578SGoldwyn Rodrigues if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 3329c853a578SGoldwyn Rodrigues range.flags |= BTRFS_DEFRAG_RANGE_START_IO; 3330c853a578SGoldwyn Rodrigues range.extent_thresh = (u32)-1; 33311e701a32SChris Mason } 33321e701a32SChris Mason } else { 33331e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 3334c853a578SGoldwyn Rodrigues range.len = (u64)-1; 33351e701a32SChris Mason } 33361ccc2e8aSQu Wenruo ret = btrfs_defrag_file(file_inode(file), &file->f_ra, 3337c853a578SGoldwyn Rodrigues &range, BTRFS_OLDEST_GENERATION, 0); 33384cb5300bSChris Mason if (ret > 0) 33394cb5300bSChris Mason ret = 0; 3340f46b5a66SChristoph Hellwig break; 33418929ecfaSYan, Zheng default: 33428929ecfaSYan, Zheng ret = -EINVAL; 3343f46b5a66SChristoph Hellwig } 3344e441d54dSChris Mason out: 334525122d15SIlya Dryomov mnt_drop_write_file(file); 3346e441d54dSChris Mason return ret; 3347f46b5a66SChristoph Hellwig } 3348f46b5a66SChristoph Hellwig 33492ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3350f46b5a66SChristoph Hellwig { 3351f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3352f46b5a66SChristoph Hellwig int ret; 3353f46b5a66SChristoph Hellwig 3354e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3355e441d54dSChris Mason return -EPERM; 3356e441d54dSChris Mason 3357c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3358e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3359c9e9f97bSIlya Dryomov 3360dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3361c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3362c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3363c9e9f97bSIlya Dryomov goto out; 3364c9e9f97bSIlya Dryomov } 3365f46b5a66SChristoph Hellwig 33665516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 33672ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3368f46b5a66SChristoph Hellwig 336943d20761SAnand Jain if (!ret) 33700b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 337143d20761SAnand Jain 3372f46b5a66SChristoph Hellwig kfree(vol_args); 3373c9e9f97bSIlya Dryomov out: 3374c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3375f46b5a66SChristoph Hellwig return ret; 3376f46b5a66SChristoph Hellwig } 3377f46b5a66SChristoph Hellwig 33786b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3379f46b5a66SChristoph Hellwig { 33800b246afaSJeff Mahoney struct inode *inode = file_inode(file); 33810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 33826b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 33833fa421deSJosef Bacik struct block_device *bdev = NULL; 33843fa421deSJosef Bacik fmode_t mode; 3385f46b5a66SChristoph Hellwig int ret; 338667ae34b6SDavid Sterba bool cancel = false; 3387f46b5a66SChristoph Hellwig 3388e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3389e441d54dSChris Mason return -EPERM; 3390e441d54dSChris Mason 3391da24927bSMiao Xie ret = mnt_want_write_file(file); 3392da24927bSMiao Xie if (ret) 3393da24927bSMiao Xie return ret; 3394c146afadSYan Zheng 3395dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3396c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3397c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3398c47ca32dSDan Carpenter goto err_drop; 3399c9e9f97bSIlya Dryomov } 3400f46b5a66SChristoph Hellwig 3401748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3402fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3403fd4e994bSOmar Sandoval goto out; 3404fd4e994bSOmar Sandoval } 34056b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 340667ae34b6SDavid Sterba if (!(vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) && 340767ae34b6SDavid Sterba strcmp("cancel", vol_args->name) == 0) 340867ae34b6SDavid Sterba cancel = true; 340967ae34b6SDavid Sterba 341067ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 341167ae34b6SDavid Sterba cancel); 341267ae34b6SDavid Sterba if (ret) 341367ae34b6SDavid Sterba goto out; 341467ae34b6SDavid Sterba /* Exclusive operation is now claimed */ 341567ae34b6SDavid Sterba 341667ae34b6SDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 34173fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, NULL, vol_args->devid, &bdev, &mode); 341867ae34b6SDavid Sterba else 34193fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); 342067ae34b6SDavid Sterba 3421c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3422183860f6SAnand Jain 34236b526ed7SAnand Jain if (!ret) { 3424735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 34250b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 34266b526ed7SAnand Jain vol_args->devid); 34276b526ed7SAnand Jain else 34280b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 34296b526ed7SAnand Jain vol_args->name); 34306b526ed7SAnand Jain } 3431183860f6SAnand Jain out: 3432183860f6SAnand Jain kfree(vol_args); 3433c47ca32dSDan Carpenter err_drop: 34344ac20c70SIlya Dryomov mnt_drop_write_file(file); 34353fa421deSJosef Bacik if (bdev) 34363fa421deSJosef Bacik blkdev_put(bdev, mode); 3437f46b5a66SChristoph Hellwig return ret; 3438f46b5a66SChristoph Hellwig } 3439f46b5a66SChristoph Hellwig 3440f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3441f46b5a66SChristoph Hellwig { 34420b246afaSJeff Mahoney struct inode *inode = file_inode(file); 34430b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3444f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 34453fa421deSJosef Bacik struct block_device *bdev = NULL; 34463fa421deSJosef Bacik fmode_t mode; 3447f46b5a66SChristoph Hellwig int ret; 344867ae34b6SDavid Sterba bool cancel; 3449f46b5a66SChristoph Hellwig 3450f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3451f46b5a66SChristoph Hellwig return -EPERM; 3452f46b5a66SChristoph Hellwig 3453f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3454f46b5a66SChristoph Hellwig if (ret) 3455f46b5a66SChristoph Hellwig return ret; 3456f46b5a66SChristoph Hellwig 345758d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 345858d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 345958d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 346067ae34b6SDavid Sterba goto out_drop_write; 3461f46b5a66SChristoph Hellwig } 346258d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 346367ae34b6SDavid Sterba cancel = (strcmp("cancel", vol_args->name) == 0); 3464f46b5a66SChristoph Hellwig 346567ae34b6SDavid Sterba ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, 346667ae34b6SDavid Sterba cancel); 346767ae34b6SDavid Sterba if (ret == 0) { 34683fa421deSJosef Bacik ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); 3469f46b5a66SChristoph Hellwig if (!ret) 34700b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3471c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 347267ae34b6SDavid Sterba } 347367ae34b6SDavid Sterba 347467ae34b6SDavid Sterba kfree(vol_args); 347558d7bbf8SDavid Sterba out_drop_write: 3476f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 34773fa421deSJosef Bacik if (bdev) 34783fa421deSJosef Bacik blkdev_put(bdev, mode); 3479f46b5a66SChristoph Hellwig return ret; 3480f46b5a66SChristoph Hellwig } 3481f46b5a66SChristoph Hellwig 34822ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 34832ff7e61eSJeff Mahoney void __user *arg) 3484475f6387SJan Schmidt { 3485027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3486475f6387SJan Schmidt struct btrfs_device *device; 34870b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3488137c5418SJohannes Thumshirn u64 flags_in; 3489027ed2f0SLi Zefan int ret = 0; 3490475f6387SJan Schmidt 3491137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3492137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3493137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3494137c5418SJohannes Thumshirn 3495137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3496137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3497027ed2f0SLi Zefan 3498d03262c7SDavid Sterba rcu_read_lock(); 3499027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3500475f6387SJan Schmidt 3501d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3502027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3503027ed2f0SLi Zefan fi_args->max_id = device->devid; 3504475f6387SJan Schmidt } 3505d03262c7SDavid Sterba rcu_read_unlock(); 3506475f6387SJan Schmidt 3507de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3508bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3509bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3510bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 351180a773fbSDavid Sterba 3512137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3513137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3514137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3515137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3516137c5418SJohannes Thumshirn } 3517137c5418SJohannes Thumshirn 35180fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 35190fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 35200fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 35210fb408a5SJohannes Thumshirn } 35220fb408a5SJohannes Thumshirn 352349bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 352449bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 352549bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 352649bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 352749bac897SJohannes Thumshirn } 352849bac897SJohannes Thumshirn 3529027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3530027ed2f0SLi Zefan ret = -EFAULT; 3531475f6387SJan Schmidt 3532027ed2f0SLi Zefan kfree(fi_args); 3533027ed2f0SLi Zefan return ret; 3534475f6387SJan Schmidt } 3535475f6387SJan Schmidt 35362ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 35372ff7e61eSJeff Mahoney void __user *arg) 3538475f6387SJan Schmidt { 3539475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3540475f6387SJan Schmidt struct btrfs_device *dev; 3541475f6387SJan Schmidt int ret = 0; 3542475f6387SJan Schmidt char *s_uuid = NULL; 3543475f6387SJan Schmidt 3544475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3545475f6387SJan Schmidt if (IS_ERR(di_args)) 3546475f6387SJan Schmidt return PTR_ERR(di_args); 3547475f6387SJan Schmidt 3548dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3549475f6387SJan Schmidt s_uuid = di_args->uuid; 3550475f6387SJan Schmidt 3551c5593ca3SDavid Sterba rcu_read_lock(); 3552e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3553b2598edfSAnand Jain NULL); 3554475f6387SJan Schmidt 3555475f6387SJan Schmidt if (!dev) { 3556475f6387SJan Schmidt ret = -ENODEV; 3557475f6387SJan Schmidt goto out; 3558475f6387SJan Schmidt } 3559475f6387SJan Schmidt 3560475f6387SJan Schmidt di_args->devid = dev->devid; 35617cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 35627cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3563475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3564a27202fbSJim Meyering if (dev->name) { 3565672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3566672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3567a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3568a27202fbSJim Meyering } else { 356999ba55adSStefan Behrens di_args->path[0] = '\0'; 3570a27202fbSJim Meyering } 3571475f6387SJan Schmidt 3572475f6387SJan Schmidt out: 3573c5593ca3SDavid Sterba rcu_read_unlock(); 3574475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3575475f6387SJan Schmidt ret = -EFAULT; 3576475f6387SJan Schmidt 3577475f6387SJan Schmidt kfree(di_args); 3578475f6387SJan Schmidt return ret; 3579475f6387SJan Schmidt } 3580475f6387SJan Schmidt 35816ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 35826ef5ed0dSJosef Bacik { 3583496ad9aaSAl Viro struct inode *inode = file_inode(file); 35840b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 35856ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 35866ef5ed0dSJosef Bacik struct btrfs_root *new_root; 35876ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 35886ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 35892a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 35906ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 35916ef5ed0dSJosef Bacik u64 objectid = 0; 35926ef5ed0dSJosef Bacik u64 dir_id; 35933c04ce01SMiao Xie int ret; 35946ef5ed0dSJosef Bacik 35956ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 35966ef5ed0dSJosef Bacik return -EPERM; 35976ef5ed0dSJosef Bacik 35983c04ce01SMiao Xie ret = mnt_want_write_file(file); 35993c04ce01SMiao Xie if (ret) 36003c04ce01SMiao Xie return ret; 36013c04ce01SMiao Xie 36023c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 36033c04ce01SMiao Xie ret = -EFAULT; 36043c04ce01SMiao Xie goto out; 36053c04ce01SMiao Xie } 36066ef5ed0dSJosef Bacik 36076ef5ed0dSJosef Bacik if (!objectid) 36081cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 36096ef5ed0dSJosef Bacik 361056e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 36113c04ce01SMiao Xie if (IS_ERR(new_root)) { 36123c04ce01SMiao Xie ret = PTR_ERR(new_root); 36133c04ce01SMiao Xie goto out; 36143c04ce01SMiao Xie } 36152a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 36162a2b5d62SJosef Bacik ret = -ENOENT; 36172a2b5d62SJosef Bacik goto out_free; 36182a2b5d62SJosef Bacik } 36196ef5ed0dSJosef Bacik 36206ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 36213c04ce01SMiao Xie if (!path) { 36223c04ce01SMiao Xie ret = -ENOMEM; 36232a2b5d62SJosef Bacik goto out_free; 36243c04ce01SMiao Xie } 36256ef5ed0dSJosef Bacik 36266ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 362798d5dc13STsutomu Itoh if (IS_ERR(trans)) { 36283c04ce01SMiao Xie ret = PTR_ERR(trans); 36292a2b5d62SJosef Bacik goto out_free; 36306ef5ed0dSJosef Bacik } 36316ef5ed0dSJosef Bacik 36320b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 36330b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 36346ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3635cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 36362a2b5d62SJosef Bacik btrfs_release_path(path); 36373a45bb20SJeff Mahoney btrfs_end_transaction(trans); 36380b246afaSJeff Mahoney btrfs_err(fs_info, 36395d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 36403c04ce01SMiao Xie ret = -ENOENT; 36412a2b5d62SJosef Bacik goto out_free; 36426ef5ed0dSJosef Bacik } 36436ef5ed0dSJosef Bacik 36446ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 36456ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 36466ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 36472a2b5d62SJosef Bacik btrfs_release_path(path); 36486ef5ed0dSJosef Bacik 36490b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 36503a45bb20SJeff Mahoney btrfs_end_transaction(trans); 36512a2b5d62SJosef Bacik out_free: 365200246528SJosef Bacik btrfs_put_root(new_root); 36532a2b5d62SJosef Bacik btrfs_free_path(path); 36543c04ce01SMiao Xie out: 36553c04ce01SMiao Xie mnt_drop_write_file(file); 36563c04ce01SMiao Xie return ret; 36576ef5ed0dSJosef Bacik } 36586ef5ed0dSJosef Bacik 3659c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3660bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3661bf5fc093SJosef Bacik { 366232da5386SDavid Sterba struct btrfs_block_group *block_group; 3663bf5fc093SJosef Bacik 3664bf5fc093SJosef Bacik space->total_bytes = 0; 3665bf5fc093SJosef Bacik space->used_bytes = 0; 3666bf5fc093SJosef Bacik space->flags = 0; 3667bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3668bf5fc093SJosef Bacik space->flags = block_group->flags; 3669b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3670bf38be65SDavid Sterba space->used_bytes += block_group->used; 3671bf5fc093SJosef Bacik } 3672bf5fc093SJosef Bacik } 3673bf5fc093SJosef Bacik 36742ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 36752ff7e61eSJeff Mahoney void __user *arg) 36761406e432SJosef Bacik { 36771406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 36781406e432SJosef Bacik struct btrfs_ioctl_space_info space; 36791406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 36807fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 368113f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 36821406e432SJosef Bacik struct btrfs_space_info *info; 3683315d8e98SColin Ian King static const u64 types[] = { 3684315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3685bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3686bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3687315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3688315d8e98SColin Ian King }; 3689bf5fc093SJosef Bacik int num_types = 4; 36907fde62bfSChris Mason int alloc_size; 36911406e432SJosef Bacik int ret = 0; 369251788b1bSDan Rosenberg u64 slot_count = 0; 3693bf5fc093SJosef Bacik int i, c; 36941406e432SJosef Bacik 36951406e432SJosef Bacik if (copy_from_user(&space_args, 36961406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 36971406e432SJosef Bacik sizeof(space_args))) 36981406e432SJosef Bacik return -EFAULT; 36991406e432SJosef Bacik 3700bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3701bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3702bf5fc093SJosef Bacik 3703bf5fc093SJosef Bacik info = NULL; 370472804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3705bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3706bf5fc093SJosef Bacik info = tmp; 3707bf5fc093SJosef Bacik break; 3708bf5fc093SJosef Bacik } 3709bf5fc093SJosef Bacik } 37101406e432SJosef Bacik 3711bf5fc093SJosef Bacik if (!info) 3712bf5fc093SJosef Bacik continue; 3713bf5fc093SJosef Bacik 3714bf5fc093SJosef Bacik down_read(&info->groups_sem); 3715bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3716bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3717bf5fc093SJosef Bacik slot_count++; 3718bf5fc093SJosef Bacik } 3719bf5fc093SJosef Bacik up_read(&info->groups_sem); 3720bf5fc093SJosef Bacik } 3721bf5fc093SJosef Bacik 372236523e95SDavid Sterba /* 372336523e95SDavid Sterba * Global block reserve, exported as a space_info 372436523e95SDavid Sterba */ 372536523e95SDavid Sterba slot_count++; 372636523e95SDavid Sterba 37277fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 37287fde62bfSChris Mason if (space_args.space_slots == 0) { 37297fde62bfSChris Mason space_args.total_spaces = slot_count; 37307fde62bfSChris Mason goto out; 37317fde62bfSChris Mason } 3732bf5fc093SJosef Bacik 373351788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3734bf5fc093SJosef Bacik 37357fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3736bf5fc093SJosef Bacik 37377fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 37387fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 37397fde62bfSChris Mason */ 374009cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 37417fde62bfSChris Mason return -ENOMEM; 37427fde62bfSChris Mason 37437fde62bfSChris Mason space_args.total_spaces = 0; 37448d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 37457fde62bfSChris Mason if (!dest) 37467fde62bfSChris Mason return -ENOMEM; 37477fde62bfSChris Mason dest_orig = dest; 37487fde62bfSChris Mason 37497fde62bfSChris Mason /* now we have a buffer to copy into */ 3750bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3751bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3752bf5fc093SJosef Bacik 375351788b1bSDan Rosenberg if (!slot_count) 375451788b1bSDan Rosenberg break; 375551788b1bSDan Rosenberg 3756bf5fc093SJosef Bacik info = NULL; 375772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3758bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3759bf5fc093SJosef Bacik info = tmp; 37607fde62bfSChris Mason break; 3761bf5fc093SJosef Bacik } 3762bf5fc093SJosef Bacik } 37637fde62bfSChris Mason 3764bf5fc093SJosef Bacik if (!info) 3765bf5fc093SJosef Bacik continue; 3766bf5fc093SJosef Bacik down_read(&info->groups_sem); 3767bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3768bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3769c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3770c065f5b1SSu Yue &space); 37717fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 37721406e432SJosef Bacik dest++; 37731406e432SJosef Bacik space_args.total_spaces++; 377451788b1bSDan Rosenberg slot_count--; 37751406e432SJosef Bacik } 377651788b1bSDan Rosenberg if (!slot_count) 377751788b1bSDan Rosenberg break; 3778bf5fc093SJosef Bacik } 3779bf5fc093SJosef Bacik up_read(&info->groups_sem); 3780bf5fc093SJosef Bacik } 37811406e432SJosef Bacik 378236523e95SDavid Sterba /* 378336523e95SDavid Sterba * Add global block reserve 378436523e95SDavid Sterba */ 378536523e95SDavid Sterba if (slot_count) { 37860b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 378736523e95SDavid Sterba 378836523e95SDavid Sterba spin_lock(&block_rsv->lock); 378936523e95SDavid Sterba space.total_bytes = block_rsv->size; 379036523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 379136523e95SDavid Sterba spin_unlock(&block_rsv->lock); 379236523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 379336523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 379436523e95SDavid Sterba space_args.total_spaces++; 379536523e95SDavid Sterba } 379636523e95SDavid Sterba 37972eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 37987fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 37997fde62bfSChris Mason 38007fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 38017fde62bfSChris Mason ret = -EFAULT; 38027fde62bfSChris Mason 38037fde62bfSChris Mason kfree(dest_orig); 38047fde62bfSChris Mason out: 38057fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 38061406e432SJosef Bacik ret = -EFAULT; 38071406e432SJosef Bacik 38081406e432SJosef Bacik return ret; 38091406e432SJosef Bacik } 38101406e432SJosef Bacik 38119a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 38129a8c28beSMiao Xie void __user *argp) 381346204592SSage Weil { 381446204592SSage Weil struct btrfs_trans_handle *trans; 381546204592SSage Weil u64 transid; 3816db5b493aSTsutomu Itoh int ret; 381746204592SSage Weil 3818d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3819ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3820ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 382198d5dc13STsutomu Itoh return PTR_ERR(trans); 3822ff7c1d33SMiao Xie 3823ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3824ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3825ff7c1d33SMiao Xie goto out; 3826ff7c1d33SMiao Xie } 382746204592SSage Weil transid = trans->transid; 382832cc4f87SDavid Sterba ret = btrfs_commit_transaction_async(trans); 38298b2b2d3cSTsutomu Itoh if (ret) { 38303a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3831db5b493aSTsutomu Itoh return ret; 38328b2b2d3cSTsutomu Itoh } 3833ff7c1d33SMiao Xie out: 383446204592SSage Weil if (argp) 383546204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 383646204592SSage Weil return -EFAULT; 383746204592SSage Weil return 0; 383846204592SSage Weil } 383946204592SSage Weil 38402ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 38419a8c28beSMiao Xie void __user *argp) 384246204592SSage Weil { 384346204592SSage Weil u64 transid; 384446204592SSage Weil 384546204592SSage Weil if (argp) { 384646204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 384746204592SSage Weil return -EFAULT; 384846204592SSage Weil } else { 384946204592SSage Weil transid = 0; /* current trans */ 385046204592SSage Weil } 38512ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 385246204592SSage Weil } 385346204592SSage Weil 3854b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3855475f6387SJan Schmidt { 38560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3857475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3858b8e95489SMiao Xie int ret; 3859475f6387SJan Schmidt 3860475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3861475f6387SJan Schmidt return -EPERM; 3862475f6387SJan Schmidt 3863475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3864475f6387SJan Schmidt if (IS_ERR(sa)) 3865475f6387SJan Schmidt return PTR_ERR(sa); 3866475f6387SJan Schmidt 3867b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3868b8e95489SMiao Xie ret = mnt_want_write_file(file); 3869b8e95489SMiao Xie if (ret) 3870b8e95489SMiao Xie goto out; 3871b8e95489SMiao Xie } 3872b8e95489SMiao Xie 38730b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 387463a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 387563a212abSStefan Behrens 0); 3876475f6387SJan Schmidt 38775afe6ce7SFilipe Manana /* 38785afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 38795afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 38805afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 38815afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 38825afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 38835afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 38845afe6ce7SFilipe Manana * previously (btrfs-progs does this). 38855afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 38865afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 38875afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 38885afe6ce7SFilipe Manana */ 38895afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3890475f6387SJan Schmidt ret = -EFAULT; 3891475f6387SJan Schmidt 3892b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3893b8e95489SMiao Xie mnt_drop_write_file(file); 3894b8e95489SMiao Xie out: 3895475f6387SJan Schmidt kfree(sa); 3896475f6387SJan Schmidt return ret; 3897475f6387SJan Schmidt } 3898475f6387SJan Schmidt 38992ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3900475f6387SJan Schmidt { 3901475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3902475f6387SJan Schmidt return -EPERM; 3903475f6387SJan Schmidt 39042ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3905475f6387SJan Schmidt } 3906475f6387SJan Schmidt 39072ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3908475f6387SJan Schmidt void __user *arg) 3909475f6387SJan Schmidt { 3910475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3911475f6387SJan Schmidt int ret; 3912475f6387SJan Schmidt 3913475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3914475f6387SJan Schmidt return -EPERM; 3915475f6387SJan Schmidt 3916475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3917475f6387SJan Schmidt if (IS_ERR(sa)) 3918475f6387SJan Schmidt return PTR_ERR(sa); 3919475f6387SJan Schmidt 39202ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3921475f6387SJan Schmidt 39224fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3923475f6387SJan Schmidt ret = -EFAULT; 3924475f6387SJan Schmidt 3925475f6387SJan Schmidt kfree(sa); 3926475f6387SJan Schmidt return ret; 3927475f6387SJan Schmidt } 3928475f6387SJan Schmidt 39292ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3930b27f7c0cSDavid Sterba void __user *arg) 3931c11d2c23SStefan Behrens { 3932c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3933c11d2c23SStefan Behrens int ret; 3934c11d2c23SStefan Behrens 3935c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3936c11d2c23SStefan Behrens if (IS_ERR(sa)) 3937c11d2c23SStefan Behrens return PTR_ERR(sa); 3938c11d2c23SStefan Behrens 3939b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3940b27f7c0cSDavid Sterba kfree(sa); 3941b27f7c0cSDavid Sterba return -EPERM; 3942b27f7c0cSDavid Sterba } 3943b27f7c0cSDavid Sterba 39442ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3945c11d2c23SStefan Behrens 3946eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3947c11d2c23SStefan Behrens ret = -EFAULT; 3948c11d2c23SStefan Behrens 3949c11d2c23SStefan Behrens kfree(sa); 3950c11d2c23SStefan Behrens return ret; 3951c11d2c23SStefan Behrens } 3952c11d2c23SStefan Behrens 39532ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 39542ff7e61eSJeff Mahoney void __user *arg) 39553f6bcfbdSStefan Behrens { 39563f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 39573f6bcfbdSStefan Behrens int ret; 39583f6bcfbdSStefan Behrens 39593f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 39603f6bcfbdSStefan Behrens return -EPERM; 39613f6bcfbdSStefan Behrens 39623f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 39633f6bcfbdSStefan Behrens if (IS_ERR(p)) 39643f6bcfbdSStefan Behrens return PTR_ERR(p); 39653f6bcfbdSStefan Behrens 39663f6bcfbdSStefan Behrens switch (p->cmd) { 39673f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3968bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3969adfa97cbSIlya Dryomov ret = -EROFS; 3970adfa97cbSIlya Dryomov goto out; 3971adfa97cbSIlya Dryomov } 3972c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3973e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 39743f6bcfbdSStefan Behrens } else { 39752ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3976c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 39773f6bcfbdSStefan Behrens } 39783f6bcfbdSStefan Behrens break; 39793f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 39800b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 39813f6bcfbdSStefan Behrens ret = 0; 39823f6bcfbdSStefan Behrens break; 39833f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 398417d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 398597282031SAnand Jain ret = 0; 39863f6bcfbdSStefan Behrens break; 39873f6bcfbdSStefan Behrens default: 39883f6bcfbdSStefan Behrens ret = -EINVAL; 39893f6bcfbdSStefan Behrens break; 39903f6bcfbdSStefan Behrens } 39913f6bcfbdSStefan Behrens 3992d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 39933f6bcfbdSStefan Behrens ret = -EFAULT; 3994adfa97cbSIlya Dryomov out: 39953f6bcfbdSStefan Behrens kfree(p); 39963f6bcfbdSStefan Behrens return ret; 39973f6bcfbdSStefan Behrens } 39983f6bcfbdSStefan Behrens 3999d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 4000d7728c96SJan Schmidt { 4001d7728c96SJan Schmidt int ret = 0; 4002d7728c96SJan Schmidt int i; 4003740c3d22SChris Mason u64 rel_ptr; 4004d7728c96SJan Schmidt int size; 4005806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 4006d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 4007d7728c96SJan Schmidt struct btrfs_path *path; 4008d7728c96SJan Schmidt 400982b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 4010d7728c96SJan Schmidt return -EPERM; 4011d7728c96SJan Schmidt 4012d7728c96SJan Schmidt path = btrfs_alloc_path(); 4013d7728c96SJan Schmidt if (!path) { 4014d7728c96SJan Schmidt ret = -ENOMEM; 4015d7728c96SJan Schmidt goto out; 4016d7728c96SJan Schmidt } 4017d7728c96SJan Schmidt 4018d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 4019d7728c96SJan Schmidt if (IS_ERR(ipa)) { 4020d7728c96SJan Schmidt ret = PTR_ERR(ipa); 4021d7728c96SJan Schmidt ipa = NULL; 4022d7728c96SJan Schmidt goto out; 4023d7728c96SJan Schmidt } 4024d7728c96SJan Schmidt 4025d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 4026d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 4027d7728c96SJan Schmidt if (IS_ERR(ipath)) { 4028d7728c96SJan Schmidt ret = PTR_ERR(ipath); 4029d7728c96SJan Schmidt ipath = NULL; 4030d7728c96SJan Schmidt goto out; 4031d7728c96SJan Schmidt } 4032d7728c96SJan Schmidt 4033d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 4034d7728c96SJan Schmidt if (ret < 0) 4035d7728c96SJan Schmidt goto out; 4036d7728c96SJan Schmidt 4037d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 4038745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 4039745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 4040740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 4041d7728c96SJan Schmidt } 4042d7728c96SJan Schmidt 4043718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 4044718dc5faSOmar Sandoval ipath->fspath, size); 4045d7728c96SJan Schmidt if (ret) { 4046d7728c96SJan Schmidt ret = -EFAULT; 4047d7728c96SJan Schmidt goto out; 4048d7728c96SJan Schmidt } 4049d7728c96SJan Schmidt 4050d7728c96SJan Schmidt out: 4051d7728c96SJan Schmidt btrfs_free_path(path); 4052d7728c96SJan Schmidt free_ipath(ipath); 4053d7728c96SJan Schmidt kfree(ipa); 4054d7728c96SJan Schmidt 4055d7728c96SJan Schmidt return ret; 4056d7728c96SJan Schmidt } 4057d7728c96SJan Schmidt 4058d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 4059d7728c96SJan Schmidt { 4060d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 4061d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 4062d7728c96SJan Schmidt 4063d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 4064d7728c96SJan Schmidt inodes->bytes_left -= c; 4065d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 4066d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 4067d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 4068d7728c96SJan Schmidt inodes->elem_cnt += 3; 4069d7728c96SJan Schmidt } else { 4070d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 4071d7728c96SJan Schmidt inodes->bytes_left = 0; 4072d7728c96SJan Schmidt inodes->elem_missed += 3; 4073d7728c96SJan Schmidt } 4074d7728c96SJan Schmidt 4075d7728c96SJan Schmidt return 0; 4076d7728c96SJan Schmidt } 4077d7728c96SJan Schmidt 40782ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 4079d24a67b2SZygo Blaxell void __user *arg, int version) 4080d7728c96SJan Schmidt { 4081d7728c96SJan Schmidt int ret = 0; 4082d7728c96SJan Schmidt int size; 4083d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 4084d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 4085d7728c96SJan Schmidt struct btrfs_path *path = NULL; 4086d24a67b2SZygo Blaxell bool ignore_offset; 4087d7728c96SJan Schmidt 4088d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 4089d7728c96SJan Schmidt return -EPERM; 4090d7728c96SJan Schmidt 4091d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 40927b9ea627SShailendra Verma if (IS_ERR(loi)) 40937b9ea627SShailendra Verma return PTR_ERR(loi); 4094d7728c96SJan Schmidt 4095d24a67b2SZygo Blaxell if (version == 1) { 4096d24a67b2SZygo Blaxell ignore_offset = false; 4097b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 4098d24a67b2SZygo Blaxell } else { 4099d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 4100d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 4101d24a67b2SZygo Blaxell ret = -EINVAL; 4102d24a67b2SZygo Blaxell goto out_loi; 4103d24a67b2SZygo Blaxell } 4104d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 4105d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 4106d24a67b2SZygo Blaxell ret = -EINVAL; 4107d24a67b2SZygo Blaxell goto out_loi; 4108d24a67b2SZygo Blaxell } 4109d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 4110b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 4111d24a67b2SZygo Blaxell } 4112d24a67b2SZygo Blaxell 4113d7728c96SJan Schmidt path = btrfs_alloc_path(); 4114d7728c96SJan Schmidt if (!path) { 4115d7728c96SJan Schmidt ret = -ENOMEM; 4116d7728c96SJan Schmidt goto out; 4117d7728c96SJan Schmidt } 4118d7728c96SJan Schmidt 4119d7728c96SJan Schmidt inodes = init_data_container(size); 4120d7728c96SJan Schmidt if (IS_ERR(inodes)) { 4121d7728c96SJan Schmidt ret = PTR_ERR(inodes); 4122d7728c96SJan Schmidt inodes = NULL; 4123d7728c96SJan Schmidt goto out; 4124d7728c96SJan Schmidt } 4125d7728c96SJan Schmidt 41262ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 4127d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 4128df031f07SLiu Bo if (ret == -EINVAL) 4129d7728c96SJan Schmidt ret = -ENOENT; 4130d7728c96SJan Schmidt if (ret < 0) 4131d7728c96SJan Schmidt goto out; 4132d7728c96SJan Schmidt 4133718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4134718dc5faSOmar Sandoval size); 4135d7728c96SJan Schmidt if (ret) 4136d7728c96SJan Schmidt ret = -EFAULT; 4137d7728c96SJan Schmidt 4138d7728c96SJan Schmidt out: 4139d7728c96SJan Schmidt btrfs_free_path(path); 4140f54de068SDavid Sterba kvfree(inodes); 4141d24a67b2SZygo Blaxell out_loi: 4142d7728c96SJan Schmidt kfree(loi); 4143d7728c96SJan Schmidt 4144d7728c96SJan Schmidt return ret; 4145d7728c96SJan Schmidt } 4146d7728c96SJan Schmidt 4147008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4148c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4149c9e9f97bSIlya Dryomov { 4150c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4151c9e9f97bSIlya Dryomov 4152c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4153c9e9f97bSIlya Dryomov 41543009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4155837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4156837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4157837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4158a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4159a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4160837d5b6eSIlya Dryomov 4161c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4162c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4163c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 416419a39dceSIlya Dryomov 416519a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 416619a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 416719a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4168c9e9f97bSIlya Dryomov } 4169c9e9f97bSIlya Dryomov 41709ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4171c9e9f97bSIlya Dryomov { 4172496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4173c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4174c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4175c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4176ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4177c9e9f97bSIlya Dryomov int ret; 4178c9e9f97bSIlya Dryomov 4179c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4180c9e9f97bSIlya Dryomov return -EPERM; 4181c9e9f97bSIlya Dryomov 4182e54bfa31SLiu Bo ret = mnt_want_write_file(file); 41839ba1f6e4SLiu Bo if (ret) 41849ba1f6e4SLiu Bo return ret; 41859ba1f6e4SLiu Bo 4186ed0fb78fSIlya Dryomov again: 4187c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4188c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4189ed0fb78fSIlya Dryomov need_unlock = true; 4190ed0fb78fSIlya Dryomov goto locked; 4191ed0fb78fSIlya Dryomov } 4192ed0fb78fSIlya Dryomov 4193ed0fb78fSIlya Dryomov /* 419401327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4195ed0fb78fSIlya Dryomov * (1) some other op is running 4196ed0fb78fSIlya Dryomov * (2) balance is running 4197ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4198ed0fb78fSIlya Dryomov */ 4199ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4200ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4201ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 42023009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4203ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4204dccdb07bSDavid Sterba /* 4205dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4206dccdb07bSDavid Sterba * we'll reexamine the status again. 4207dccdb07bSDavid Sterba */ 4208ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4209ed0fb78fSIlya Dryomov 4210ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 42113009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4212ed0fb78fSIlya Dryomov /* this is (3) */ 4213ed0fb78fSIlya Dryomov need_unlock = false; 4214ed0fb78fSIlya Dryomov goto locked; 4215ed0fb78fSIlya Dryomov } 4216ed0fb78fSIlya Dryomov 4217ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4218ed0fb78fSIlya Dryomov goto again; 4219ed0fb78fSIlya Dryomov } else { 4220ed0fb78fSIlya Dryomov /* this is (2) */ 4221ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4222ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4223ed0fb78fSIlya Dryomov goto out; 4224ed0fb78fSIlya Dryomov } 4225ed0fb78fSIlya Dryomov } else { 4226ed0fb78fSIlya Dryomov /* this is (1) */ 4227ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4228e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4229ed0fb78fSIlya Dryomov goto out; 4230ed0fb78fSIlya Dryomov } 4231ed0fb78fSIlya Dryomov 4232ed0fb78fSIlya Dryomov locked: 4233c9e9f97bSIlya Dryomov 4234c9e9f97bSIlya Dryomov if (arg) { 4235c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4236c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4237c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4238ed0fb78fSIlya Dryomov goto out_unlock; 4239c9e9f97bSIlya Dryomov } 4240de322263SIlya Dryomov 4241de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4242de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4243de322263SIlya Dryomov ret = -ENOTCONN; 4244de322263SIlya Dryomov goto out_bargs; 4245de322263SIlya Dryomov } 4246de322263SIlya Dryomov 4247de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4248de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4249de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4250de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4251de322263SIlya Dryomov 4252de322263SIlya Dryomov goto do_balance; 4253de322263SIlya Dryomov } 4254c9e9f97bSIlya Dryomov } else { 4255c9e9f97bSIlya Dryomov bargs = NULL; 4256c9e9f97bSIlya Dryomov } 4257c9e9f97bSIlya Dryomov 4258ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4259837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4260837d5b6eSIlya Dryomov goto out_bargs; 4261837d5b6eSIlya Dryomov } 4262837d5b6eSIlya Dryomov 42638d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4264c9e9f97bSIlya Dryomov if (!bctl) { 4265c9e9f97bSIlya Dryomov ret = -ENOMEM; 4266c9e9f97bSIlya Dryomov goto out_bargs; 4267c9e9f97bSIlya Dryomov } 4268c9e9f97bSIlya Dryomov 4269c9e9f97bSIlya Dryomov if (arg) { 4270c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4271c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4272c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4273c9e9f97bSIlya Dryomov 4274c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4275f43ffb60SIlya Dryomov } else { 4276f43ffb60SIlya Dryomov /* balance everything - no filters */ 4277f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4278c9e9f97bSIlya Dryomov } 4279c9e9f97bSIlya Dryomov 42808eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 42818eb93459SDavid Sterba ret = -EINVAL; 42820f89abf5SChristian Engelmayer goto out_bctl; 42838eb93459SDavid Sterba } 42848eb93459SDavid Sterba 4285de322263SIlya Dryomov do_balance: 4286c9e9f97bSIlya Dryomov /* 4287c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4288c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4289c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4290c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4291c9e9f97bSIlya Dryomov */ 4292ed0fb78fSIlya Dryomov need_unlock = false; 4293ed0fb78fSIlya Dryomov 42946fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 42950f89abf5SChristian Engelmayer bctl = NULL; 4296ed0fb78fSIlya Dryomov 4297d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4298c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4299c9e9f97bSIlya Dryomov ret = -EFAULT; 4300c9e9f97bSIlya Dryomov } 4301c9e9f97bSIlya Dryomov 43020f89abf5SChristian Engelmayer out_bctl: 43030f89abf5SChristian Engelmayer kfree(bctl); 4304c9e9f97bSIlya Dryomov out_bargs: 4305c9e9f97bSIlya Dryomov kfree(bargs); 4306ed0fb78fSIlya Dryomov out_unlock: 4307c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4308ed0fb78fSIlya Dryomov if (need_unlock) 4309c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4310ed0fb78fSIlya Dryomov out: 4311e54bfa31SLiu Bo mnt_drop_write_file(file); 4312c9e9f97bSIlya Dryomov return ret; 4313c9e9f97bSIlya Dryomov } 4314c9e9f97bSIlya Dryomov 43152ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4316837d5b6eSIlya Dryomov { 4317837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4318837d5b6eSIlya Dryomov return -EPERM; 4319837d5b6eSIlya Dryomov 4320837d5b6eSIlya Dryomov switch (cmd) { 4321837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 43220b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4323a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 43240b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4325837d5b6eSIlya Dryomov } 4326837d5b6eSIlya Dryomov 4327837d5b6eSIlya Dryomov return -EINVAL; 4328837d5b6eSIlya Dryomov } 4329837d5b6eSIlya Dryomov 43302ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 433119a39dceSIlya Dryomov void __user *arg) 433219a39dceSIlya Dryomov { 433319a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 433419a39dceSIlya Dryomov int ret = 0; 433519a39dceSIlya Dryomov 433619a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 433719a39dceSIlya Dryomov return -EPERM; 433819a39dceSIlya Dryomov 433919a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 434019a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 434119a39dceSIlya Dryomov ret = -ENOTCONN; 434219a39dceSIlya Dryomov goto out; 434319a39dceSIlya Dryomov } 434419a39dceSIlya Dryomov 43458d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 434619a39dceSIlya Dryomov if (!bargs) { 434719a39dceSIlya Dryomov ret = -ENOMEM; 434819a39dceSIlya Dryomov goto out; 434919a39dceSIlya Dryomov } 435019a39dceSIlya Dryomov 4351008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 435219a39dceSIlya Dryomov 435319a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 435419a39dceSIlya Dryomov ret = -EFAULT; 435519a39dceSIlya Dryomov 435619a39dceSIlya Dryomov kfree(bargs); 435719a39dceSIlya Dryomov out: 435819a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 435919a39dceSIlya Dryomov return ret; 436019a39dceSIlya Dryomov } 436119a39dceSIlya Dryomov 4362905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 43635d13a37bSArne Jansen { 43640b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43650b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43665d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 43675d13a37bSArne Jansen int ret; 43685d13a37bSArne Jansen 43695d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43705d13a37bSArne Jansen return -EPERM; 43715d13a37bSArne Jansen 4372905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4373905b0ddaSMiao Xie if (ret) 4374905b0ddaSMiao Xie return ret; 43755d13a37bSArne Jansen 43765d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4377905b0ddaSMiao Xie if (IS_ERR(sa)) { 4378905b0ddaSMiao Xie ret = PTR_ERR(sa); 4379905b0ddaSMiao Xie goto drop_write; 4380905b0ddaSMiao Xie } 43815d13a37bSArne Jansen 43820b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 43835d13a37bSArne Jansen 43845d13a37bSArne Jansen switch (sa->cmd) { 43855d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4386340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 43875d13a37bSArne Jansen break; 43885d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4389340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 43905d13a37bSArne Jansen break; 43915d13a37bSArne Jansen default: 43925d13a37bSArne Jansen ret = -EINVAL; 43935d13a37bSArne Jansen break; 43945d13a37bSArne Jansen } 43955d13a37bSArne Jansen 43965d13a37bSArne Jansen kfree(sa); 43970b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4398905b0ddaSMiao Xie drop_write: 4399905b0ddaSMiao Xie mnt_drop_write_file(file); 44005d13a37bSArne Jansen return ret; 44015d13a37bSArne Jansen } 44025d13a37bSArne Jansen 4403905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 44045d13a37bSArne Jansen { 44050b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44060b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44070b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 44085d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 44095d13a37bSArne Jansen struct btrfs_trans_handle *trans; 44105d13a37bSArne Jansen int ret; 44115d13a37bSArne Jansen int err; 44125d13a37bSArne Jansen 44135d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 44145d13a37bSArne Jansen return -EPERM; 44155d13a37bSArne Jansen 4416905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4417905b0ddaSMiao Xie if (ret) 4418905b0ddaSMiao Xie return ret; 44195d13a37bSArne Jansen 44205d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4421905b0ddaSMiao Xie if (IS_ERR(sa)) { 4422905b0ddaSMiao Xie ret = PTR_ERR(sa); 4423905b0ddaSMiao Xie goto drop_write; 4424905b0ddaSMiao Xie } 44255d13a37bSArne Jansen 44265d13a37bSArne Jansen trans = btrfs_join_transaction(root); 44275d13a37bSArne Jansen if (IS_ERR(trans)) { 44285d13a37bSArne Jansen ret = PTR_ERR(trans); 44295d13a37bSArne Jansen goto out; 44305d13a37bSArne Jansen } 44315d13a37bSArne Jansen 44325d13a37bSArne Jansen if (sa->assign) { 44339f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 44345d13a37bSArne Jansen } else { 443539616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 44365d13a37bSArne Jansen } 44375d13a37bSArne Jansen 4438e082f563SQu Wenruo /* update qgroup status and info */ 4439280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4440e082f563SQu Wenruo if (err < 0) 44410b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4442ad8403dfSAnand Jain "failed to update qgroup status and info"); 44433a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 44445d13a37bSArne Jansen if (err && !ret) 44455d13a37bSArne Jansen ret = err; 44465d13a37bSArne Jansen 44475d13a37bSArne Jansen out: 44485d13a37bSArne Jansen kfree(sa); 4449905b0ddaSMiao Xie drop_write: 4450905b0ddaSMiao Xie mnt_drop_write_file(file); 44515d13a37bSArne Jansen return ret; 44525d13a37bSArne Jansen } 44535d13a37bSArne Jansen 4454905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 44555d13a37bSArne Jansen { 44560b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44570b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 44585d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 44595d13a37bSArne Jansen struct btrfs_trans_handle *trans; 44605d13a37bSArne Jansen int ret; 44615d13a37bSArne Jansen int err; 44625d13a37bSArne Jansen 44635d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 44645d13a37bSArne Jansen return -EPERM; 44655d13a37bSArne Jansen 4466905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4467905b0ddaSMiao Xie if (ret) 4468905b0ddaSMiao Xie return ret; 44695d13a37bSArne Jansen 44705d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4471905b0ddaSMiao Xie if (IS_ERR(sa)) { 4472905b0ddaSMiao Xie ret = PTR_ERR(sa); 4473905b0ddaSMiao Xie goto drop_write; 4474905b0ddaSMiao Xie } 44755d13a37bSArne Jansen 4476d86e56cfSMiao Xie if (!sa->qgroupid) { 4477d86e56cfSMiao Xie ret = -EINVAL; 4478d86e56cfSMiao Xie goto out; 4479d86e56cfSMiao Xie } 4480d86e56cfSMiao Xie 44815d13a37bSArne Jansen trans = btrfs_join_transaction(root); 44825d13a37bSArne Jansen if (IS_ERR(trans)) { 44835d13a37bSArne Jansen ret = PTR_ERR(trans); 44845d13a37bSArne Jansen goto out; 44855d13a37bSArne Jansen } 44865d13a37bSArne Jansen 44875d13a37bSArne Jansen if (sa->create) { 448849a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 44895d13a37bSArne Jansen } else { 44903efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 44915d13a37bSArne Jansen } 44925d13a37bSArne Jansen 44933a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 44945d13a37bSArne Jansen if (err && !ret) 44955d13a37bSArne Jansen ret = err; 44965d13a37bSArne Jansen 44975d13a37bSArne Jansen out: 44985d13a37bSArne Jansen kfree(sa); 4499905b0ddaSMiao Xie drop_write: 4500905b0ddaSMiao Xie mnt_drop_write_file(file); 45015d13a37bSArne Jansen return ret; 45025d13a37bSArne Jansen } 45035d13a37bSArne Jansen 4504905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 45055d13a37bSArne Jansen { 45060b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45070b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 45085d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 45095d13a37bSArne Jansen struct btrfs_trans_handle *trans; 45105d13a37bSArne Jansen int ret; 45115d13a37bSArne Jansen int err; 45125d13a37bSArne Jansen u64 qgroupid; 45135d13a37bSArne Jansen 45145d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 45155d13a37bSArne Jansen return -EPERM; 45165d13a37bSArne Jansen 4517905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4518905b0ddaSMiao Xie if (ret) 4519905b0ddaSMiao Xie return ret; 45205d13a37bSArne Jansen 45215d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4522905b0ddaSMiao Xie if (IS_ERR(sa)) { 4523905b0ddaSMiao Xie ret = PTR_ERR(sa); 4524905b0ddaSMiao Xie goto drop_write; 4525905b0ddaSMiao Xie } 45265d13a37bSArne Jansen 45275d13a37bSArne Jansen trans = btrfs_join_transaction(root); 45285d13a37bSArne Jansen if (IS_ERR(trans)) { 45295d13a37bSArne Jansen ret = PTR_ERR(trans); 45305d13a37bSArne Jansen goto out; 45315d13a37bSArne Jansen } 45325d13a37bSArne Jansen 45335d13a37bSArne Jansen qgroupid = sa->qgroupid; 45345d13a37bSArne Jansen if (!qgroupid) { 45355d13a37bSArne Jansen /* take the current subvol as qgroup */ 45365d13a37bSArne Jansen qgroupid = root->root_key.objectid; 45375d13a37bSArne Jansen } 45385d13a37bSArne Jansen 4539f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 45405d13a37bSArne Jansen 45413a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 45425d13a37bSArne Jansen if (err && !ret) 45435d13a37bSArne Jansen ret = err; 45445d13a37bSArne Jansen 45455d13a37bSArne Jansen out: 45465d13a37bSArne Jansen kfree(sa); 4547905b0ddaSMiao Xie drop_write: 4548905b0ddaSMiao Xie mnt_drop_write_file(file); 45495d13a37bSArne Jansen return ret; 45505d13a37bSArne Jansen } 45515d13a37bSArne Jansen 45522f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 45532f232036SJan Schmidt { 45540b246afaSJeff Mahoney struct inode *inode = file_inode(file); 45550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 45562f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 45572f232036SJan Schmidt int ret; 45582f232036SJan Schmidt 45592f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 45602f232036SJan Schmidt return -EPERM; 45612f232036SJan Schmidt 45622f232036SJan Schmidt ret = mnt_want_write_file(file); 45632f232036SJan Schmidt if (ret) 45642f232036SJan Schmidt return ret; 45652f232036SJan Schmidt 45662f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 45672f232036SJan Schmidt if (IS_ERR(qsa)) { 45682f232036SJan Schmidt ret = PTR_ERR(qsa); 45692f232036SJan Schmidt goto drop_write; 45702f232036SJan Schmidt } 45712f232036SJan Schmidt 45722f232036SJan Schmidt if (qsa->flags) { 45732f232036SJan Schmidt ret = -EINVAL; 45742f232036SJan Schmidt goto out; 45752f232036SJan Schmidt } 45762f232036SJan Schmidt 45770b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 45782f232036SJan Schmidt 45792f232036SJan Schmidt out: 45802f232036SJan Schmidt kfree(qsa); 45812f232036SJan Schmidt drop_write: 45822f232036SJan Schmidt mnt_drop_write_file(file); 45832f232036SJan Schmidt return ret; 45842f232036SJan Schmidt } 45852f232036SJan Schmidt 4586b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4587b929c1d8SMarcos Paulo de Souza void __user *arg) 45882f232036SJan Schmidt { 45890afb603aSGoldwyn Rodrigues struct btrfs_ioctl_quota_rescan_args qsa = {0}; 45902f232036SJan Schmidt 45912f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 45922f232036SJan Schmidt return -EPERM; 45932f232036SJan Schmidt 45940b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 45950afb603aSGoldwyn Rodrigues qsa.flags = 1; 45960afb603aSGoldwyn Rodrigues qsa.progress = fs_info->qgroup_rescan_progress.objectid; 45972f232036SJan Schmidt } 45982f232036SJan Schmidt 45990afb603aSGoldwyn Rodrigues if (copy_to_user(arg, &qsa, sizeof(qsa))) 4600991a3daeSAnand Jain return -EFAULT; 46012f232036SJan Schmidt 4602991a3daeSAnand Jain return 0; 46032f232036SJan Schmidt } 46042f232036SJan Schmidt 4605b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4606b929c1d8SMarcos Paulo de Souza void __user *arg) 460757254b6eSJan Schmidt { 460857254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 460957254b6eSJan Schmidt return -EPERM; 461057254b6eSJan Schmidt 46110b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 461257254b6eSJan Schmidt } 461357254b6eSJan Schmidt 4614abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4615e4fed17aSChristian Brauner struct user_namespace *mnt_userns, 4616abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 46178ea05e3aSAlexander Block { 4618496ad9aaSAl Viro struct inode *inode = file_inode(file); 46190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46208ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 46218ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 46228ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 462395582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 46248ea05e3aSAlexander Block int ret = 0; 4625dd5f9615SStefan Behrens int received_uuid_changed; 46268ea05e3aSAlexander Block 4627e4fed17aSChristian Brauner if (!inode_owner_or_capable(mnt_userns, inode)) 4628bd60ea0fSDavid Sterba return -EPERM; 4629bd60ea0fSDavid Sterba 46308ea05e3aSAlexander Block ret = mnt_want_write_file(file); 46318ea05e3aSAlexander Block if (ret < 0) 46328ea05e3aSAlexander Block return ret; 46338ea05e3aSAlexander Block 46340b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 46358ea05e3aSAlexander Block 46364a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 46378ea05e3aSAlexander Block ret = -EINVAL; 46388ea05e3aSAlexander Block goto out; 46398ea05e3aSAlexander Block } 46408ea05e3aSAlexander Block 46418ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 46428ea05e3aSAlexander Block ret = -EROFS; 46438ea05e3aSAlexander Block goto out; 46448ea05e3aSAlexander Block } 46458ea05e3aSAlexander Block 4646dd5f9615SStefan Behrens /* 4647dd5f9615SStefan Behrens * 1 - root item 4648dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4649dd5f9615SStefan Behrens */ 4650dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 46518ea05e3aSAlexander Block if (IS_ERR(trans)) { 46528ea05e3aSAlexander Block ret = PTR_ERR(trans); 46538ea05e3aSAlexander Block trans = NULL; 46548ea05e3aSAlexander Block goto out; 46558ea05e3aSAlexander Block } 46568ea05e3aSAlexander Block 46578ea05e3aSAlexander Block sa->rtransid = trans->transid; 46588ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 46598ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 46608ea05e3aSAlexander Block 4661dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4662dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4663dd5f9615SStefan Behrens if (received_uuid_changed && 4664d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4665d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4666dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4667dd5f9615SStefan Behrens root->root_key.objectid); 4668d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4669d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4670d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4671d87ff758SNikolay Borisov goto out; 4672d87ff758SNikolay Borisov } 4673d87ff758SNikolay Borisov } 46748ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 46758ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 46768ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 46773cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 46783cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 46793cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 46803cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 46818ea05e3aSAlexander Block 46820b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 46838ea05e3aSAlexander Block &root->root_key, &root->root_item); 46848ea05e3aSAlexander Block if (ret < 0) { 46853a45bb20SJeff Mahoney btrfs_end_transaction(trans); 46868ea05e3aSAlexander Block goto out; 4687dd5f9615SStefan Behrens } 4688dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4689cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4690dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4691dd5f9615SStefan Behrens root->root_key.objectid); 4692dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 469366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4694efd38150SNikolay Borisov btrfs_end_transaction(trans); 4695dd5f9615SStefan Behrens goto out; 4696dd5f9615SStefan Behrens } 4697dd5f9615SStefan Behrens } 46983a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4699abccd00fSHugo Mills out: 47000b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4701abccd00fSHugo Mills mnt_drop_write_file(file); 4702abccd00fSHugo Mills return ret; 4703abccd00fSHugo Mills } 4704abccd00fSHugo Mills 4705abccd00fSHugo Mills #ifdef CONFIG_64BIT 4706abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4707abccd00fSHugo Mills void __user *arg) 4708abccd00fSHugo Mills { 4709abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4710abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4711abccd00fSHugo Mills int ret = 0; 4712abccd00fSHugo Mills 4713abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 47147b9ea627SShailendra Verma if (IS_ERR(args32)) 47157b9ea627SShailendra Verma return PTR_ERR(args32); 4716abccd00fSHugo Mills 47178d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 471884dbeb87SDan Carpenter if (!args64) { 471984dbeb87SDan Carpenter ret = -ENOMEM; 4720abccd00fSHugo Mills goto out; 4721abccd00fSHugo Mills } 4722abccd00fSHugo Mills 4723abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4724abccd00fSHugo Mills args64->stransid = args32->stransid; 4725abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4726abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4727abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4728abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4729abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4730abccd00fSHugo Mills args64->flags = args32->flags; 4731abccd00fSHugo Mills 4732e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); 4733abccd00fSHugo Mills if (ret) 4734abccd00fSHugo Mills goto out; 4735abccd00fSHugo Mills 4736abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4737abccd00fSHugo Mills args32->stransid = args64->stransid; 4738abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4739abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4740abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4741abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4742abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4743abccd00fSHugo Mills args32->flags = args64->flags; 4744abccd00fSHugo Mills 4745abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4746abccd00fSHugo Mills if (ret) 4747abccd00fSHugo Mills ret = -EFAULT; 4748abccd00fSHugo Mills 4749abccd00fSHugo Mills out: 4750abccd00fSHugo Mills kfree(args32); 4751abccd00fSHugo Mills kfree(args64); 4752abccd00fSHugo Mills return ret; 4753abccd00fSHugo Mills } 4754abccd00fSHugo Mills #endif 4755abccd00fSHugo Mills 4756abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4757abccd00fSHugo Mills void __user *arg) 4758abccd00fSHugo Mills { 4759abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4760abccd00fSHugo Mills int ret = 0; 4761abccd00fSHugo Mills 4762abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 47637b9ea627SShailendra Verma if (IS_ERR(sa)) 47647b9ea627SShailendra Verma return PTR_ERR(sa); 4765abccd00fSHugo Mills 4766e4fed17aSChristian Brauner ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); 4767abccd00fSHugo Mills 4768abccd00fSHugo Mills if (ret) 4769abccd00fSHugo Mills goto out; 4770abccd00fSHugo Mills 47718ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 47728ea05e3aSAlexander Block if (ret) 47738ea05e3aSAlexander Block ret = -EFAULT; 47748ea05e3aSAlexander Block 47758ea05e3aSAlexander Block out: 47768ea05e3aSAlexander Block kfree(sa); 47778ea05e3aSAlexander Block return ret; 47788ea05e3aSAlexander Block } 47798ea05e3aSAlexander Block 4780b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4781b929c1d8SMarcos Paulo de Souza void __user *arg) 4782867ab667Sjeff.liu { 4783a1b83ac5SAnand Jain size_t len; 4784867ab667Sjeff.liu int ret; 4785a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4786a1b83ac5SAnand Jain 47870b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 47880b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 47890b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4790a1b83ac5SAnand Jain 4791a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4792867ab667Sjeff.liu 4793867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 47940b246afaSJeff Mahoney btrfs_warn(fs_info, 47950b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 47960b246afaSJeff Mahoney --len); 4797867ab667Sjeff.liu } 4798867ab667Sjeff.liu 4799867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4800867ab667Sjeff.liu 4801867ab667Sjeff.liu return ret ? -EFAULT : 0; 4802867ab667Sjeff.liu } 4803867ab667Sjeff.liu 4804a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4805a8bfd4abSjeff.liu { 48060b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48070b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48080b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48090b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4810a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4811a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4812a8bfd4abSjeff.liu int ret; 4813a8bfd4abSjeff.liu 4814a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4815a8bfd4abSjeff.liu return -EPERM; 4816a8bfd4abSjeff.liu 4817a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4818a8bfd4abSjeff.liu return -EFAULT; 4819a8bfd4abSjeff.liu 4820a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 48210b246afaSJeff Mahoney btrfs_err(fs_info, 48225d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4823a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4824a8bfd4abSjeff.liu return -EINVAL; 4825a8bfd4abSjeff.liu } 4826a8bfd4abSjeff.liu 4827a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4828a8bfd4abSjeff.liu if (ret) 4829a8bfd4abSjeff.liu return ret; 4830a8bfd4abSjeff.liu 4831a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4832a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4833a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4834a8bfd4abSjeff.liu goto out_unlock; 4835a8bfd4abSjeff.liu } 4836a8bfd4abSjeff.liu 48370b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4838a8bfd4abSjeff.liu strcpy(super_block->label, label); 48390b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48403a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4841a8bfd4abSjeff.liu 4842a8bfd4abSjeff.liu out_unlock: 4843a8bfd4abSjeff.liu mnt_drop_write_file(file); 4844a8bfd4abSjeff.liu return ret; 4845a8bfd4abSjeff.liu } 4846a8bfd4abSjeff.liu 48472eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 48482eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 48492eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 48502eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 48512eaa055fSJeff Mahoney 4852d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 48532eaa055fSJeff Mahoney { 48544d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 48552eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 48562eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 48572eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 48582eaa055fSJeff Mahoney }; 48592eaa055fSJeff Mahoney 48602eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 48612eaa055fSJeff Mahoney return -EFAULT; 48622eaa055fSJeff Mahoney 48632eaa055fSJeff Mahoney return 0; 48642eaa055fSJeff Mahoney } 48652eaa055fSJeff Mahoney 4866b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4867b929c1d8SMarcos Paulo de Souza void __user *arg) 48682eaa055fSJeff Mahoney { 48690b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 48702eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 48712eaa055fSJeff Mahoney 48722eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 48732eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 48742eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 48752eaa055fSJeff Mahoney 48762eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 48772eaa055fSJeff Mahoney return -EFAULT; 48782eaa055fSJeff Mahoney 48792eaa055fSJeff Mahoney return 0; 48802eaa055fSJeff Mahoney } 48812eaa055fSJeff Mahoney 48822ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 48833b02a68aSJeff Mahoney enum btrfs_feature_set set, 48842eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 48852eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 48862eaa055fSJeff Mahoney { 4887f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 48883b02a68aSJeff Mahoney char *names; 48892eaa055fSJeff Mahoney u64 disallowed, unsupported; 48902eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 48912eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 48922eaa055fSJeff Mahoney 48932eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 48942eaa055fSJeff Mahoney if (unsupported) { 48953b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 48963b02a68aSJeff Mahoney if (names) { 48970b246afaSJeff Mahoney btrfs_warn(fs_info, 48983b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 48993b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 49003b02a68aSJeff Mahoney kfree(names); 49013b02a68aSJeff Mahoney } else 49020b246afaSJeff Mahoney btrfs_warn(fs_info, 49032eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 49042eaa055fSJeff Mahoney type, unsupported); 49052eaa055fSJeff Mahoney return -EOPNOTSUPP; 49062eaa055fSJeff Mahoney } 49072eaa055fSJeff Mahoney 49082eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 49092eaa055fSJeff Mahoney if (disallowed) { 49103b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 49113b02a68aSJeff Mahoney if (names) { 49120b246afaSJeff Mahoney btrfs_warn(fs_info, 49133b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 49143b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 49153b02a68aSJeff Mahoney kfree(names); 49163b02a68aSJeff Mahoney } else 49170b246afaSJeff Mahoney btrfs_warn(fs_info, 49182eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 49192eaa055fSJeff Mahoney type, disallowed); 49202eaa055fSJeff Mahoney return -EPERM; 49212eaa055fSJeff Mahoney } 49222eaa055fSJeff Mahoney 49232eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 49242eaa055fSJeff Mahoney if (disallowed) { 49253b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 49263b02a68aSJeff Mahoney if (names) { 49270b246afaSJeff Mahoney btrfs_warn(fs_info, 49283b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 49293b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 49303b02a68aSJeff Mahoney kfree(names); 49313b02a68aSJeff Mahoney } else 49320b246afaSJeff Mahoney btrfs_warn(fs_info, 49332eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 49342eaa055fSJeff Mahoney type, disallowed); 49352eaa055fSJeff Mahoney return -EPERM; 49362eaa055fSJeff Mahoney } 49372eaa055fSJeff Mahoney 49382eaa055fSJeff Mahoney return 0; 49392eaa055fSJeff Mahoney } 49402eaa055fSJeff Mahoney 49412ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 49422ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 49432eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 49442eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 49452eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 49462eaa055fSJeff Mahoney 49472eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 49482eaa055fSJeff Mahoney { 49490b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49510b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49520b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 49532eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 49542eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 49552eaa055fSJeff Mahoney u64 newflags; 49562eaa055fSJeff Mahoney int ret; 49572eaa055fSJeff Mahoney 49582eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 49592eaa055fSJeff Mahoney return -EPERM; 49602eaa055fSJeff Mahoney 49612eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 49622eaa055fSJeff Mahoney return -EFAULT; 49632eaa055fSJeff Mahoney 49642eaa055fSJeff Mahoney /* Nothing to do */ 49652eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 49662eaa055fSJeff Mahoney !flags[0].incompat_flags) 49672eaa055fSJeff Mahoney return 0; 49682eaa055fSJeff Mahoney 49692ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 49702eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 49712eaa055fSJeff Mahoney if (ret) 49722eaa055fSJeff Mahoney return ret; 49732eaa055fSJeff Mahoney 49742ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 49752eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 49762eaa055fSJeff Mahoney if (ret) 49772eaa055fSJeff Mahoney return ret; 49782eaa055fSJeff Mahoney 49792ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 49802eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 49812eaa055fSJeff Mahoney if (ret) 49822eaa055fSJeff Mahoney return ret; 49832eaa055fSJeff Mahoney 49847ab19625SDavid Sterba ret = mnt_want_write_file(file); 49857ab19625SDavid Sterba if (ret) 49867ab19625SDavid Sterba return ret; 49877ab19625SDavid Sterba 49888051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 49897ab19625SDavid Sterba if (IS_ERR(trans)) { 49907ab19625SDavid Sterba ret = PTR_ERR(trans); 49917ab19625SDavid Sterba goto out_drop_write; 49927ab19625SDavid Sterba } 49932eaa055fSJeff Mahoney 49940b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 49952eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 49962eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 49972eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 49982eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 49992eaa055fSJeff Mahoney 50002eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 50012eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 50022eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 50032eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 50042eaa055fSJeff Mahoney 50052eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 50062eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 50072eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 50082eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 50090b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 50102eaa055fSJeff Mahoney 50113a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 50127ab19625SDavid Sterba out_drop_write: 50137ab19625SDavid Sterba mnt_drop_write_file(file); 50147ab19625SDavid Sterba 50157ab19625SDavid Sterba return ret; 50162eaa055fSJeff Mahoney } 50172eaa055fSJeff Mahoney 50182351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 50192351f431SJosef Bacik { 50202351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 50212351f431SJosef Bacik int ret; 50222351f431SJosef Bacik 50232351f431SJosef Bacik if (compat) { 50242351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50252351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 50262351f431SJosef Bacik 50272351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 50282351f431SJosef Bacik if (ret) 50292351f431SJosef Bacik return -EFAULT; 50302351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 50312351f431SJosef Bacik if (!arg) 50322351f431SJosef Bacik return -ENOMEM; 50332351f431SJosef Bacik arg->send_fd = args32.send_fd; 50342351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 50352351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 50362351f431SJosef Bacik arg->parent_root = args32.parent_root; 50372351f431SJosef Bacik arg->flags = args32.flags; 50382351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 50392351f431SJosef Bacik sizeof(args32.reserved)); 50402351f431SJosef Bacik #else 50412351f431SJosef Bacik return -ENOTTY; 50422351f431SJosef Bacik #endif 50432351f431SJosef Bacik } else { 50442351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 50452351f431SJosef Bacik if (IS_ERR(arg)) 50462351f431SJosef Bacik return PTR_ERR(arg); 50472351f431SJosef Bacik } 50482351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 50492351f431SJosef Bacik kfree(arg); 50502351f431SJosef Bacik return ret; 50512351f431SJosef Bacik } 50522351f431SJosef Bacik 5053f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 5054f46b5a66SChristoph Hellwig cmd, unsigned long arg) 5055f46b5a66SChristoph Hellwig { 50560b246afaSJeff Mahoney struct inode *inode = file_inode(file); 50570b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 50580b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 50594bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 5060f46b5a66SChristoph Hellwig 5061f46b5a66SChristoph Hellwig switch (cmd) { 50626cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 50636cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 506440cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 5065b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 506640cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 506740cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 5068f7039b1dSLi Dongyang case FITRIM: 5069b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 5070f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 5071fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 5072fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 5073fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 50743de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 5075fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 50766f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 50776f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 507876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 5079949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 5080949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 5081949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 50820caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 50830caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 50840caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 50850caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 50866ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 50876ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 5088f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 50891e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 50901e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 50911e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 5092f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 5093198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 5094f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 50952ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 5096f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 5097da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 50986b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 50996b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 5100475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 51012ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 5102475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 51032ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 5104f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 51059ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 5106ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 5107ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 5108cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 5109cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 5110ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 5111ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 5112d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 5113d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 5114d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 5115d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 5116d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 5117d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 51181406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 51192ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 51209b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 51219b199859SFilipe David Borba Manana int ret; 51229b199859SFilipe David Borba Manana 51239db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 51249b199859SFilipe David Borba Manana if (ret) 51259b199859SFilipe David Borba Manana return ret; 51260b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 51272fad4e83SDavid Sterba /* 51282fad4e83SDavid Sterba * The transaction thread may want to do more work, 512901327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 51302fad4e83SDavid Sterba * processing uncleaned subvols. 51312fad4e83SDavid Sterba */ 51320b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 51339b199859SFilipe David Borba Manana return ret; 51349b199859SFilipe David Borba Manana } 513546204592SSage Weil case BTRFS_IOC_START_SYNC: 51369a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 513746204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 51382ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5139475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5140b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5141475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 51422ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5143475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 51442ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5145c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 51469ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5147837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 51482ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 514919a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 51502ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 51518ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 51528ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5153abccd00fSHugo Mills #ifdef CONFIG_64BIT 5154abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5155abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5156abccd00fSHugo Mills #endif 515731db9f7cSAlexander Block case BTRFS_IOC_SEND: 51582351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 51592351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 51602351f431SJosef Bacik case BTRFS_IOC_SEND_32: 51612351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 51622351f431SJosef Bacik #endif 5163c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 51642ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 51655d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5166905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 51675d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5168905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 51695d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5170905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 51715d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5172905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 51732f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 51742f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 51752f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5176b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 517757254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5178b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 51793f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 51802ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 51812eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5182d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 51832eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5184b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 51852eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 51862eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5187b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5188b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 518942e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 519042e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 519123d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 519223d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 519314605409SBoris Burkov case FS_IOC_ENABLE_VERITY: 519414605409SBoris Burkov return fsverity_ioctl_enable(file, (const void __user *)argp); 519514605409SBoris Burkov case FS_IOC_MEASURE_VERITY: 519614605409SBoris Burkov return fsverity_ioctl_measure(file, argp); 5197f46b5a66SChristoph Hellwig } 5198f46b5a66SChristoph Hellwig 5199f46b5a66SChristoph Hellwig return -ENOTTY; 5200f46b5a66SChristoph Hellwig } 52014c63c245SLuke Dashjr 52024c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 52034c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 52044c63c245SLuke Dashjr { 52052a362249SJeff Mahoney /* 52062a362249SJeff Mahoney * These all access 32-bit values anyway so no further 52072a362249SJeff Mahoney * handling is necessary. 52082a362249SJeff Mahoney */ 52094c63c245SLuke Dashjr switch (cmd) { 52104c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 52114c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 52124c63c245SLuke Dashjr break; 52134c63c245SLuke Dashjr } 52144c63c245SLuke Dashjr 52154c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 52164c63c245SLuke Dashjr } 52174c63c245SLuke Dashjr #endif 5218