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> 29f46b5a66SChristoph Hellwig #include "ctree.h" 30f46b5a66SChristoph Hellwig #include "disk-io.h" 31949964c9SMarcos Paulo de Souza #include "export.h" 32f46b5a66SChristoph Hellwig #include "transaction.h" 33f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 34f46b5a66SChristoph Hellwig #include "print-tree.h" 35f46b5a66SChristoph Hellwig #include "volumes.h" 36925baeddSChris Mason #include "locking.h" 37d7728c96SJan Schmidt #include "backref.h" 38606686eeSJosef Bacik #include "rcu-string.h" 3931db9f7cSAlexander Block #include "send.h" 403f6bcfbdSStefan Behrens #include "dev-replace.h" 4163541927SFilipe David Borba Manana #include "props.h" 423b02a68aSJeff Mahoney #include "sysfs.h" 43fcebe456SJosef Bacik #include "qgroup.h" 441ec9a1aeSFilipe Manana #include "tree-log.h" 45ebb8765bSAnand Jain #include "compression.h" 468719aaaeSJosef Bacik #include "space-info.h" 4786736342SJosef Bacik #include "delalloc-space.h" 48aac0023cSJosef Bacik #include "block-group.h" 49f46b5a66SChristoph Hellwig 50abccd00fSHugo Mills #ifdef CONFIG_64BIT 51abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 52abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 53abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 54abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 55abccd00fSHugo Mills */ 56abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 57abccd00fSHugo Mills __u64 sec; 58abccd00fSHugo Mills __u32 nsec; 59abccd00fSHugo Mills } __attribute__ ((__packed__)); 60abccd00fSHugo Mills 61abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 62abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 63abccd00fSHugo Mills __u64 stransid; /* in */ 64abccd00fSHugo Mills __u64 rtransid; /* out */ 65abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 66abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 67abccd00fSHugo Mills __u64 flags; /* in */ 68abccd00fSHugo Mills __u64 reserved[16]; /* in */ 69abccd00fSHugo Mills } __attribute__ ((__packed__)); 70abccd00fSHugo Mills 71abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 72abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 73abccd00fSHugo Mills #endif 74abccd00fSHugo Mills 752351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 762351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 772351f431SJosef Bacik __s64 send_fd; /* in */ 782351f431SJosef Bacik __u64 clone_sources_count; /* in */ 792351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 802351f431SJosef Bacik __u64 parent_root; /* in */ 812351f431SJosef Bacik __u64 flags; /* in */ 822351f431SJosef Bacik __u64 reserved[4]; /* in */ 832351f431SJosef Bacik } __attribute__ ((__packed__)); 842351f431SJosef Bacik 852351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 862351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 872351f431SJosef Bacik #endif 88abccd00fSHugo Mills 896cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 901905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 911905a0f7SDavid Sterba unsigned int flags) 926cbff00fSChristoph Hellwig { 931905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 946cbff00fSChristoph Hellwig return flags; 951905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 966cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 976cbff00fSChristoph Hellwig else 986cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 996cbff00fSChristoph Hellwig } 100f46b5a66SChristoph Hellwig 1016cbff00fSChristoph Hellwig /* 102a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 103a157d4fdSDavid Sterba * ioctl. 1046cbff00fSChristoph Hellwig */ 105a157d4fdSDavid Sterba static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags) 1066cbff00fSChristoph Hellwig { 1076cbff00fSChristoph Hellwig unsigned int iflags = 0; 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1106cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1116cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1126cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1136cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1146cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1156cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1166cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1176cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1186cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1196cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1206cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 121d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 122d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 123d0092bddSLi Zefan 12413f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 125d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 12613f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 12713f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1286cbff00fSChristoph Hellwig 1296cbff00fSChristoph Hellwig return iflags; 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig /* 1336cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1346cbff00fSChristoph Hellwig */ 1357b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1366cbff00fSChristoph Hellwig { 1375c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1383cc79392SFilipe Manana unsigned int new_fl = 0; 1396cbff00fSChristoph Hellwig 1405c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1413cc79392SFilipe Manana new_fl |= S_SYNC; 1425c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1433cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1445c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1453cc79392SFilipe Manana new_fl |= S_APPEND; 1465c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1473cc79392SFilipe Manana new_fl |= S_NOATIME; 1485c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1493cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1503cc79392SFilipe Manana 1513cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1523cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1533cc79392SFilipe Manana new_fl); 1546cbff00fSChristoph Hellwig } 1556cbff00fSChristoph Hellwig 1566cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1576cbff00fSChristoph Hellwig { 1585c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 1595c57b8b6SDavid Sterba unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags); 1606cbff00fSChristoph Hellwig 1616cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1626cbff00fSChristoph Hellwig return -EFAULT; 1636cbff00fSChristoph Hellwig return 0; 1646cbff00fSChristoph Hellwig } 1656cbff00fSChristoph Hellwig 166f37c563bSDavid Sterba /* 167f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 168f37c563bSDavid Sterba * the old and new flags are not conflicting 169f37c563bSDavid Sterba */ 170f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 17175e7cb7fSLiu Bo { 17275e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17375e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17475e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 175e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 176e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17775e7cb7fSLiu Bo return -EOPNOTSUPP; 17875e7cb7fSLiu Bo 179f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 18075e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 18175e7cb7fSLiu Bo return -EINVAL; 18275e7cb7fSLiu Bo 183f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 184f37c563bSDavid Sterba return -EINVAL; 185f37c563bSDavid Sterba 186f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 187f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 188f37c563bSDavid Sterba return -EINVAL; 189f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 190f37c563bSDavid Sterba return -EINVAL; 191f37c563bSDavid Sterba 19275e7cb7fSLiu Bo return 0; 19375e7cb7fSLiu Bo } 19475e7cb7fSLiu Bo 195d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 196d206e9c9SNaohiro Aota unsigned int flags) 197d206e9c9SNaohiro Aota { 198d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 199d206e9c9SNaohiro Aota return -EPERM; 200d206e9c9SNaohiro Aota 201d206e9c9SNaohiro Aota return 0; 202d206e9c9SNaohiro Aota } 203d206e9c9SNaohiro Aota 2046cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2056cbff00fSChristoph Hellwig { 206496ad9aaSAl Viro struct inode *inode = file_inode(file); 2070b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2085c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2095c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2106cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2115aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2126cbff00fSChristoph Hellwig int ret; 213ff9fef55SAnand Jain const char *comp = NULL; 214f37c563bSDavid Sterba u32 binode_flags; 2156cbff00fSChristoph Hellwig 21621cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 217bd60ea0fSDavid Sterba return -EPERM; 218bd60ea0fSDavid Sterba 219b83cc969SLi Zefan if (btrfs_root_readonly(root)) 220b83cc969SLi Zefan return -EROFS; 221b83cc969SLi Zefan 2225c57b8b6SDavid Sterba if (copy_from_user(&fsflags, arg, sizeof(fsflags))) 2236cbff00fSChristoph Hellwig return -EFAULT; 2246cbff00fSChristoph Hellwig 225e7848683SJan Kara ret = mnt_want_write_file(file); 226e7848683SJan Kara if (ret) 227e7848683SJan Kara return ret; 228e7848683SJan Kara 22964708539SJosef Bacik btrfs_inode_lock(inode, 0); 2305c57b8b6SDavid Sterba fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); 2315aca2842SDarrick J. Wong old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 232f37c563bSDavid Sterba 2335aca2842SDarrick J. Wong ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags); 2345aca2842SDarrick J. Wong if (ret) 2356cbff00fSChristoph Hellwig goto out_unlock; 2366cbff00fSChristoph Hellwig 237f37c563bSDavid Sterba ret = check_fsflags(old_fsflags, fsflags); 238f37c563bSDavid Sterba if (ret) 239f37c563bSDavid Sterba goto out_unlock; 240f37c563bSDavid Sterba 241d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 242d206e9c9SNaohiro Aota if (ret) 243d206e9c9SNaohiro Aota goto out_unlock; 244d206e9c9SNaohiro Aota 245f37c563bSDavid Sterba binode_flags = binode->flags; 2465c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 247d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2486cbff00fSChristoph Hellwig else 249d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2505c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 251d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2526cbff00fSChristoph Hellwig else 253d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2545c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 255d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2566cbff00fSChristoph Hellwig else 257d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2585c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 259d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2606cbff00fSChristoph Hellwig else 261d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2625c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 263d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2646cbff00fSChristoph Hellwig else 265d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 2665c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 267d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2686cbff00fSChristoph Hellwig else 269d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2705c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 27144e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2727e97b8daSDavid Sterba /* 2737e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2747e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2757e97b8daSDavid Sterba * status of the file and will not set it. 2767e97b8daSDavid Sterba */ 2777e97b8daSDavid Sterba if (inode->i_size == 0) 278d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 279d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2807e97b8daSDavid Sterba } else { 281d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2827e97b8daSDavid Sterba } 2837e97b8daSDavid Sterba } else { 2847e97b8daSDavid Sterba /* 28501327610SNicholas D Steeves * Revert back under same assumptions as above 2867e97b8daSDavid Sterba */ 28744e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2887e97b8daSDavid Sterba if (inode->i_size == 0) 289d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 290d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2917e97b8daSDavid Sterba } else { 292d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 2937e97b8daSDavid Sterba } 2947e97b8daSDavid Sterba } 2956cbff00fSChristoph Hellwig 29675e7cb7fSLiu Bo /* 29775e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 29875e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 29975e7cb7fSLiu Bo * things smaller. 30075e7cb7fSLiu Bo */ 3015c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 302d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 303d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3045c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 30563541927SFilipe David Borba Manana 306eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 307eede2bf3SOmar Sandoval ret = -ETXTBSY; 308eede2bf3SOmar Sandoval goto out_unlock; 309eede2bf3SOmar Sandoval } 310eede2bf3SOmar Sandoval 311d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 312d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 31363541927SFilipe David Borba Manana 31493370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 31593370509SDavid Sterba if (!comp || comp[0] == 0) 31693370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 317ebcb904dSLi Zefan } else { 318d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 31975e7cb7fSLiu Bo } 3206cbff00fSChristoph Hellwig 321ff9fef55SAnand Jain /* 322ff9fef55SAnand Jain * 1 for inode item 323ff9fef55SAnand Jain * 2 for properties 324ff9fef55SAnand Jain */ 325ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 326f062abf0SLi Zefan if (IS_ERR(trans)) { 327f062abf0SLi Zefan ret = PTR_ERR(trans); 328d2b8fcfeSAnand Jain goto out_unlock; 329f062abf0SLi Zefan } 3306cbff00fSChristoph Hellwig 331ff9fef55SAnand Jain if (comp) { 332ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 333ff9fef55SAnand Jain strlen(comp), 0); 334ff9fef55SAnand Jain if (ret) { 335ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 336ff9fef55SAnand Jain goto out_end_trans; 337ff9fef55SAnand Jain } 338ff9fef55SAnand Jain } else { 339ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 340ff9fef55SAnand Jain 0, 0); 341ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 342ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 343ff9fef55SAnand Jain goto out_end_trans; 344ff9fef55SAnand Jain } 345ff9fef55SAnand Jain } 346ff9fef55SAnand Jain 347d2b8fcfeSAnand Jain binode->flags = binode_flags; 3487b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3490c4d2d95SJosef Bacik inode_inc_iversion(inode); 350c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3519a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3526cbff00fSChristoph Hellwig 353ff9fef55SAnand Jain out_end_trans: 3543a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3556cbff00fSChristoph Hellwig out_unlock: 35664708539SJosef Bacik btrfs_inode_unlock(inode, 0); 357e7848683SJan Kara mnt_drop_write_file(file); 3582d4e6f6aSliubo return ret; 3596cbff00fSChristoph Hellwig } 3606cbff00fSChristoph Hellwig 36119f93b3cSDavid Sterba /* 36219f93b3cSDavid Sterba * Translate btrfs internal inode flags to xflags as expected by the 36319f93b3cSDavid Sterba * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are 36419f93b3cSDavid Sterba * silently dropped. 36519f93b3cSDavid Sterba */ 36619f93b3cSDavid Sterba static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) 36719f93b3cSDavid Sterba { 36819f93b3cSDavid Sterba unsigned int xflags = 0; 36919f93b3cSDavid Sterba 37019f93b3cSDavid Sterba if (flags & BTRFS_INODE_APPEND) 37119f93b3cSDavid Sterba xflags |= FS_XFLAG_APPEND; 37219f93b3cSDavid Sterba if (flags & BTRFS_INODE_IMMUTABLE) 37319f93b3cSDavid Sterba xflags |= FS_XFLAG_IMMUTABLE; 37419f93b3cSDavid Sterba if (flags & BTRFS_INODE_NOATIME) 37519f93b3cSDavid Sterba xflags |= FS_XFLAG_NOATIME; 37619f93b3cSDavid Sterba if (flags & BTRFS_INODE_NODUMP) 37719f93b3cSDavid Sterba xflags |= FS_XFLAG_NODUMP; 37819f93b3cSDavid Sterba if (flags & BTRFS_INODE_SYNC) 37919f93b3cSDavid Sterba xflags |= FS_XFLAG_SYNC; 38019f93b3cSDavid Sterba 38119f93b3cSDavid Sterba return xflags; 38219f93b3cSDavid Sterba } 38319f93b3cSDavid Sterba 38419f93b3cSDavid Sterba /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ 38519f93b3cSDavid Sterba static int check_xflags(unsigned int flags) 38619f93b3cSDavid Sterba { 38719f93b3cSDavid Sterba if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | 38819f93b3cSDavid Sterba FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) 38919f93b3cSDavid Sterba return -EOPNOTSUPP; 39019f93b3cSDavid Sterba return 0; 39119f93b3cSDavid Sterba } 39219f93b3cSDavid Sterba 393c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 394c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 395c3e1f96cSGoldwyn Rodrigues { 396c3e1f96cSGoldwyn Rodrigues return !cmpxchg(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE, type); 397c3e1f96cSGoldwyn Rodrigues } 398c3e1f96cSGoldwyn Rodrigues 399c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 400c3e1f96cSGoldwyn Rodrigues { 401c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 40266a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 403c3e1f96cSGoldwyn Rodrigues } 404c3e1f96cSGoldwyn Rodrigues 405e4202ac9SDavid Sterba /* 406e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 407e4202ac9SDavid Sterba * are zeroed. 408e4202ac9SDavid Sterba */ 409e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 410e4202ac9SDavid Sterba { 411e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 412e4202ac9SDavid Sterba struct fsxattr fa; 413e4202ac9SDavid Sterba 4147b0e492eSDarrick J. Wong simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags)); 415e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 416e4202ac9SDavid Sterba return -EFAULT; 417e4202ac9SDavid Sterba 418e4202ac9SDavid Sterba return 0; 419e4202ac9SDavid Sterba } 420e4202ac9SDavid Sterba 421025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 422025f2121SDavid Sterba { 423025f2121SDavid Sterba struct inode *inode = file_inode(file); 424025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 425025f2121SDavid Sterba struct btrfs_root *root = binode->root; 426025f2121SDavid Sterba struct btrfs_trans_handle *trans; 4277b0e492eSDarrick J. Wong struct fsxattr fa, old_fa; 428025f2121SDavid Sterba unsigned old_flags; 429025f2121SDavid Sterba unsigned old_i_flags; 430025f2121SDavid Sterba int ret = 0; 431025f2121SDavid Sterba 43221cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 433025f2121SDavid Sterba return -EPERM; 434025f2121SDavid Sterba 435025f2121SDavid Sterba if (btrfs_root_readonly(root)) 436025f2121SDavid Sterba return -EROFS; 437025f2121SDavid Sterba 438025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 439025f2121SDavid Sterba return -EFAULT; 440025f2121SDavid Sterba 441025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 442025f2121SDavid Sterba if (ret) 443025f2121SDavid Sterba return ret; 444025f2121SDavid Sterba 445025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 446025f2121SDavid Sterba return -EOPNOTSUPP; 447025f2121SDavid Sterba 448025f2121SDavid Sterba ret = mnt_want_write_file(file); 449025f2121SDavid Sterba if (ret) 450025f2121SDavid Sterba return ret; 451025f2121SDavid Sterba 45264708539SJosef Bacik btrfs_inode_lock(inode, 0); 453025f2121SDavid Sterba 454025f2121SDavid Sterba old_flags = binode->flags; 455025f2121SDavid Sterba old_i_flags = inode->i_flags; 456025f2121SDavid Sterba 4577b0e492eSDarrick J. Wong simple_fill_fsxattr(&old_fa, 4587b0e492eSDarrick J. Wong btrfs_inode_flags_to_xflags(binode->flags)); 4597b0e492eSDarrick J. Wong ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); 4607b0e492eSDarrick J. Wong if (ret) 461025f2121SDavid Sterba goto out_unlock; 462025f2121SDavid Sterba 463025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 464025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 465025f2121SDavid Sterba else 466025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 467025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 468025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 469025f2121SDavid Sterba else 470025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 471025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 472025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 473025f2121SDavid Sterba else 474025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 475025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 476025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 477025f2121SDavid Sterba else 478025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 479025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 480025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 481025f2121SDavid Sterba else 482025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 483025f2121SDavid Sterba 484025f2121SDavid Sterba /* 1 item for the inode */ 485025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 486025f2121SDavid Sterba if (IS_ERR(trans)) { 487025f2121SDavid Sterba ret = PTR_ERR(trans); 488025f2121SDavid Sterba goto out_unlock; 489025f2121SDavid Sterba } 490025f2121SDavid Sterba 491025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 492025f2121SDavid Sterba inode_inc_iversion(inode); 493025f2121SDavid Sterba inode->i_ctime = current_time(inode); 4949a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 495025f2121SDavid Sterba 496025f2121SDavid Sterba btrfs_end_transaction(trans); 497025f2121SDavid Sterba 498025f2121SDavid Sterba out_unlock: 499025f2121SDavid Sterba if (ret) { 500025f2121SDavid Sterba binode->flags = old_flags; 501025f2121SDavid Sterba inode->i_flags = old_i_flags; 502025f2121SDavid Sterba } 503025f2121SDavid Sterba 50464708539SJosef Bacik btrfs_inode_unlock(inode, 0); 505025f2121SDavid Sterba mnt_drop_write_file(file); 506025f2121SDavid Sterba 507025f2121SDavid Sterba return ret; 508025f2121SDavid Sterba } 509025f2121SDavid Sterba 5106cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 5116cbff00fSChristoph Hellwig { 512496ad9aaSAl Viro struct inode *inode = file_inode(file); 5136cbff00fSChristoph Hellwig 5146cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 5156cbff00fSChristoph Hellwig } 516f46b5a66SChristoph Hellwig 517b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 518b929c1d8SMarcos Paulo de Souza void __user *arg) 519f7039b1dSLi Dongyang { 520f7039b1dSLi Dongyang struct btrfs_device *device; 521f7039b1dSLi Dongyang struct request_queue *q; 522f7039b1dSLi Dongyang struct fstrim_range range; 523f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 524f7039b1dSLi Dongyang u64 num_devices = 0; 525f7039b1dSLi Dongyang int ret; 526f7039b1dSLi Dongyang 527f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 528f7039b1dSLi Dongyang return -EPERM; 529f7039b1dSLi Dongyang 530f35f06c3SFilipe Manana /* 5311cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 5321cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 5331cb3dc3fSNaohiro Aota * filesystem for now. 5341cb3dc3fSNaohiro Aota */ 5351cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 5361cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 5371cb3dc3fSNaohiro Aota 5381cb3dc3fSNaohiro Aota /* 539f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 540f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 541f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 542f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 543f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 544f35f06c3SFilipe Manana */ 545f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 546f35f06c3SFilipe Manana return -EROFS; 547f35f06c3SFilipe Manana 5481f78160cSXiao Guangrong rcu_read_lock(); 5491f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5501f78160cSXiao Guangrong dev_list) { 551f7039b1dSLi Dongyang if (!device->bdev) 552f7039b1dSLi Dongyang continue; 553f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 554f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 555f7039b1dSLi Dongyang num_devices++; 55650d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 557f7039b1dSLi Dongyang minlen); 558f7039b1dSLi Dongyang } 559f7039b1dSLi Dongyang } 5601f78160cSXiao Guangrong rcu_read_unlock(); 561f4c697e6SLukas Czerner 562f7039b1dSLi Dongyang if (!num_devices) 563f7039b1dSLi Dongyang return -EOPNOTSUPP; 564f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 565f7039b1dSLi Dongyang return -EFAULT; 5666ba9fc8eSQu Wenruo 5676ba9fc8eSQu Wenruo /* 5686ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5696ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5706ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5716ba9fc8eSQu Wenruo */ 5726ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 573f4c697e6SLukas Czerner return -EINVAL; 574f7039b1dSLi Dongyang 575f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5762ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 577f7039b1dSLi Dongyang if (ret < 0) 578f7039b1dSLi Dongyang return ret; 579f7039b1dSLi Dongyang 580f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 581f7039b1dSLi Dongyang return -EFAULT; 582f7039b1dSLi Dongyang 583f7039b1dSLi Dongyang return 0; 584f7039b1dSLi Dongyang } 585f7039b1dSLi Dongyang 586e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 587dd5f9615SStefan Behrens { 58846e0f66aSChris Mason int i; 58946e0f66aSChris Mason 59046e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 59146e0f66aSChris Mason if (uuid[i]) 59246e0f66aSChris Mason return 0; 59346e0f66aSChris Mason } 59446e0f66aSChris Mason return 1; 595dd5f9615SStefan Behrens } 596dd5f9615SStefan Behrens 597d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 598cb8e7090SChristoph Hellwig struct dentry *dentry, 59952f75f4fSDavid Sterba const char *name, int namelen, 6008696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 601f46b5a66SChristoph Hellwig { 6020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 603f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 604f46b5a66SChristoph Hellwig struct btrfs_key key; 60549a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 606f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 607f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 608d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 60976dda93cSYan, Zheng struct btrfs_root *new_root; 610d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 61195582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 6125662344bSTsutomu Itoh struct inode *inode; 613f46b5a66SChristoph Hellwig int ret; 614f46b5a66SChristoph Hellwig int err; 6152dfb1e43SQu Wenruo dev_t anon_dev = 0; 616f46b5a66SChristoph Hellwig u64 objectid; 6173de4586cSChris Mason u64 index = 0; 618f46b5a66SChristoph Hellwig 61949a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 62049a3c4d9SDavid Sterba if (!root_item) 62149a3c4d9SDavid Sterba return -ENOMEM; 62249a3c4d9SDavid Sterba 623543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6242fbe8c8aSAl Viro if (ret) 62549a3c4d9SDavid Sterba goto fail_free; 6266a912213SJosef Bacik 6272dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 6282dfb1e43SQu Wenruo if (ret < 0) 6292dfb1e43SQu Wenruo goto fail_free; 6302dfb1e43SQu Wenruo 631e09fe2d2SQu Wenruo /* 632e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 63301327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 634e09fe2d2SQu Wenruo */ 63549a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 63649a3c4d9SDavid Sterba ret = -ENOSPC; 63749a3c4d9SDavid Sterba goto fail_free; 63849a3c4d9SDavid Sterba } 639e09fe2d2SQu Wenruo 640d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6419ed74f2dSJosef Bacik /* 642d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 643d5c12070SMiao Xie * of create_snapshot(). 6449ed74f2dSJosef Bacik */ 645c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 646d5c12070SMiao Xie if (ret) 64749a3c4d9SDavid Sterba goto fail_free; 648f46b5a66SChristoph Hellwig 649d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 650d5c12070SMiao Xie if (IS_ERR(trans)) { 651d5c12070SMiao Xie ret = PTR_ERR(trans); 652e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 65349a3c4d9SDavid Sterba goto fail_free; 654d5c12070SMiao Xie } 655d5c12070SMiao Xie trans->block_rsv = &block_rsv; 656d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 657f46b5a66SChristoph Hellwig 658a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6596f72c7e2SArne Jansen if (ret) 6606f72c7e2SArne Jansen goto fail; 6616f72c7e2SArne Jansen 6629631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6639631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6648e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6658e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6668e8a1e31SJosef Bacik goto fail; 6678e8a1e31SJosef Bacik } 668f46b5a66SChristoph Hellwig 669f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 670f46b5a66SChristoph Hellwig 67149a3c4d9SDavid Sterba inode_item = &root_item->inode; 6723cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6733cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6743cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 675da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6760b246afaSJeff Mahoney fs_info->nodesize); 6773cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 678f46b5a66SChristoph Hellwig 67949a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 68049a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6813cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 68208fe4db1SLi Zefan 68349a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 68449a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 68549a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 68649a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 68749a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68849a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 689f46b5a66SChristoph Hellwig 69049a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 69149a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 692807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 69349a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 69449a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 69549a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 69649a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 69749a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 698f46b5a66SChristoph Hellwig 699925baeddSChris Mason btrfs_tree_unlock(leaf); 700f46b5a66SChristoph Hellwig 70169948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 702f46b5a66SChristoph Hellwig 703f46b5a66SChristoph Hellwig key.objectid = objectid; 7045d4f98a2SYan Zheng key.offset = 0; 705962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7060b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70749a3c4d9SDavid Sterba root_item); 70867addf29SFilipe Manana if (ret) { 70967addf29SFilipe Manana /* 71067addf29SFilipe Manana * Since we don't abort the transaction in this case, free the 71167addf29SFilipe Manana * tree block so that we don't leak space and leave the 71267addf29SFilipe Manana * filesystem in an inconsistent state (an extent item in the 71367addf29SFilipe Manana * extent tree without backreferences). Also no need to have 71467addf29SFilipe Manana * the tree block locked since it is not in any tree at this 71567addf29SFilipe Manana * point, so no other task can find it and use it. 71667addf29SFilipe Manana */ 71767addf29SFilipe Manana btrfs_free_tree_block(trans, root, leaf, 0, 1); 71867addf29SFilipe Manana free_extent_buffer(leaf); 719f46b5a66SChristoph Hellwig goto fail; 72067addf29SFilipe Manana } 72167addf29SFilipe Manana 72267addf29SFilipe Manana free_extent_buffer(leaf); 72367addf29SFilipe Manana leaf = NULL; 724f46b5a66SChristoph Hellwig 72576dda93cSYan, Zheng key.offset = (u64)-1; 7262dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 72779787eaaSJeff Mahoney if (IS_ERR(new_root)) { 7282dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 72979787eaaSJeff Mahoney ret = PTR_ERR(new_root); 73066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 73179787eaaSJeff Mahoney goto fail; 73279787eaaSJeff Mahoney } 7332dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 7342dfb1e43SQu Wenruo anon_dev = 0; 73576dda93cSYan, Zheng 736221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 737221581e4SJosef Bacik if (ret) { 738221581e4SJosef Bacik btrfs_put_root(new_root); 739221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 740221581e4SJosef Bacik goto fail; 741221581e4SJosef Bacik } 74276dda93cSYan, Zheng 74369948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 74400246528SJosef Bacik btrfs_put_root(new_root); 745ce598979SMark Fasheh if (ret) { 746ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 74766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 748ce598979SMark Fasheh goto fail; 749ce598979SMark Fasheh } 750ce598979SMark Fasheh 751f46b5a66SChristoph Hellwig /* 752f46b5a66SChristoph Hellwig * insert the directory item 753f46b5a66SChristoph Hellwig */ 754877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 75579787eaaSJeff Mahoney if (ret) { 75666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 75779787eaaSJeff Mahoney goto fail; 75879787eaaSJeff Mahoney } 7593de4586cSChris Mason 760684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7613de4586cSChris Mason BTRFS_FT_DIR, index); 76279787eaaSJeff Mahoney if (ret) { 76366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 764f46b5a66SChristoph Hellwig goto fail; 76579787eaaSJeff Mahoney } 7660660b5afSChris Mason 7676ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7689a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 769c7e54b51SJosef Bacik if (ret) { 770c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 771c7e54b51SJosef Bacik goto fail; 772c7e54b51SJosef Bacik } 77352c26179SYan Zheng 7746025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7754a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 776c7e54b51SJosef Bacik if (ret) { 777c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 778c7e54b51SJosef Bacik goto fail; 779c7e54b51SJosef Bacik } 7800660b5afSChris Mason 781cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7826bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 783dd5f9615SStefan Behrens if (ret) 78466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 785dd5f9615SStefan Behrens 786f46b5a66SChristoph Hellwig fail: 78749a3c4d9SDavid Sterba kfree(root_item); 788d5c12070SMiao Xie trans->block_rsv = NULL; 789d5c12070SMiao Xie trans->bytes_reserved = 0; 790e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 791de6e8200SLiu Bo 7923a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 793f46b5a66SChristoph Hellwig if (err && !ret) 794f46b5a66SChristoph Hellwig ret = err; 7951a65e24bSChris Mason 7965662344bSTsutomu Itoh if (!ret) { 7975662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 798de6e8200SLiu Bo if (IS_ERR(inode)) 799de6e8200SLiu Bo return PTR_ERR(inode); 8005662344bSTsutomu Itoh d_instantiate(dentry, inode); 8015662344bSTsutomu Itoh } 802f46b5a66SChristoph Hellwig return ret; 80349a3c4d9SDavid Sterba 80449a3c4d9SDavid Sterba fail_free: 8052dfb1e43SQu Wenruo if (anon_dev) 8062dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 80749a3c4d9SDavid Sterba kfree(root_item); 80849a3c4d9SDavid Sterba return ret; 809f46b5a66SChristoph Hellwig } 810f46b5a66SChristoph Hellwig 811e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 8129babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 813e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 814f46b5a66SChristoph Hellwig { 8150b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 8162e4bfab9SYan, Zheng struct inode *inode; 817f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 818f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 8192e4bfab9SYan, Zheng int ret; 820f46b5a66SChristoph Hellwig 82192a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 822f46b5a66SChristoph Hellwig return -EINVAL; 823f46b5a66SChristoph Hellwig 824eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 825eede2bf3SOmar Sandoval btrfs_warn(fs_info, 826eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 827eede2bf3SOmar Sandoval return -ETXTBSY; 828eede2bf3SOmar Sandoval } 829eede2bf3SOmar Sandoval 83023269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 831a1ee7362SDavid Sterba if (!pending_snapshot) 832a1ee7362SDavid Sterba return -ENOMEM; 833a1ee7362SDavid Sterba 8342dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8352dfb1e43SQu Wenruo if (ret < 0) 8362dfb1e43SQu Wenruo goto free_pending; 837b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 83823269bf5SDavid Sterba GFP_KERNEL); 8398546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8408546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 841b0c0ea63SDavid Sterba ret = -ENOMEM; 842b0c0ea63SDavid Sterba goto free_pending; 843b0c0ea63SDavid Sterba } 844b0c0ea63SDavid Sterba 84566d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 84666d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 847d5c12070SMiao Xie /* 848d5c12070SMiao Xie * 1 - parent dir inode 849d5c12070SMiao Xie * 2 - dir entries 850d5c12070SMiao Xie * 1 - root item 851d5c12070SMiao Xie * 2 - root ref/backref 852d5c12070SMiao Xie * 1 - root of snapshot 853dd5f9615SStefan Behrens * 1 - UUID item 854d5c12070SMiao Xie */ 855d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 856dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 857ee3441b4SJeff Mahoney false); 858d5c12070SMiao Xie if (ret) 859c11fbb6eSRobbie Ko goto free_pending; 860d5c12070SMiao Xie 861a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 862a22285a6SYan, Zheng pending_snapshot->root = root; 863b83cc969SLi Zefan pending_snapshot->readonly = readonly; 864e9662f70SMiao Xie pending_snapshot->dir = dir; 8658696c533SMiao Xie pending_snapshot->inherit = inherit; 866a22285a6SYan, Zheng 867d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 868a22285a6SYan, Zheng if (IS_ERR(trans)) { 869a22285a6SYan, Zheng ret = PTR_ERR(trans); 870a22285a6SYan, Zheng goto fail; 871a22285a6SYan, Zheng } 872a22285a6SYan, Zheng 8730b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 874a22285a6SYan, Zheng list_add(&pending_snapshot->list, 875a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8760b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8779babda9fSNikolay Borisov 8783a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 879aec8030aSMiao Xie if (ret) 880c37b2b62SJosef Bacik goto fail; 881a22285a6SYan, Zheng 882a22285a6SYan, Zheng ret = pending_snapshot->error; 883f46b5a66SChristoph Hellwig if (ret) 8842e4bfab9SYan, Zheng goto fail; 885f46b5a66SChristoph Hellwig 886d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 887d3797308SChris Mason if (ret) 888d3797308SChris Mason goto fail; 889d3797308SChris Mason 8902b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8912e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8922e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8932e4bfab9SYan, Zheng goto fail; 8942e4bfab9SYan, Zheng } 8955662344bSTsutomu Itoh 8962e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8972e4bfab9SYan, Zheng ret = 0; 8982dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8992e4bfab9SYan, Zheng fail: 9002dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 9012dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 9022dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 90300246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 904e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 905b0c0ea63SDavid Sterba free_pending: 9062dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 9072dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 908b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 9098546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 910a1ee7362SDavid Sterba kfree(pending_snapshot); 911a1ee7362SDavid Sterba 912f46b5a66SChristoph Hellwig return ret; 913f46b5a66SChristoph Hellwig } 914f46b5a66SChristoph Hellwig 9154260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 9164260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 9174260f7c7SSage Weil * whether the type of victim is right. 9184260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 9194260f7c7SSage Weil * 2. We should have write and exec permissions on dir 9204260f7c7SSage Weil * 3. We can't remove anything from append-only dir 9214260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 9224260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 9234260f7c7SSage Weil * a. be owner of dir, or 9244260f7c7SSage Weil * b. be owner of victim, or 9254260f7c7SSage Weil * c. have CAP_FOWNER capability 92601327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 9274260f7c7SSage Weil * links pointing to it. 9284260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 9294260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 9304260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 9314260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9324260f7c7SSage Weil * nfs_async_unlink(). 9334260f7c7SSage Weil */ 9344260f7c7SSage Weil 9354260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9364260f7c7SSage Weil { 9374260f7c7SSage Weil int error; 9384260f7c7SSage Weil 9392b0143b5SDavid Howells if (d_really_is_negative(victim)) 9404260f7c7SSage Weil return -ENOENT; 9414260f7c7SSage Weil 9422b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9434fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9444260f7c7SSage Weil 94547291baaSChristian Brauner error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 9464260f7c7SSage Weil if (error) 9474260f7c7SSage Weil return error; 9484260f7c7SSage Weil if (IS_APPEND(dir)) 9494260f7c7SSage Weil return -EPERM; 950ba73d987SChristian Brauner if (check_sticky(&init_user_ns, dir, d_inode(victim)) || 951ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 952ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9534260f7c7SSage Weil return -EPERM; 9544260f7c7SSage Weil if (isdir) { 955e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9564260f7c7SSage Weil return -ENOTDIR; 9574260f7c7SSage Weil if (IS_ROOT(victim)) 9584260f7c7SSage Weil return -EBUSY; 959e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9604260f7c7SSage Weil return -EISDIR; 9614260f7c7SSage Weil if (IS_DEADDIR(dir)) 9624260f7c7SSage Weil return -ENOENT; 9634260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9644260f7c7SSage Weil return -EBUSY; 9654260f7c7SSage Weil return 0; 9664260f7c7SSage Weil } 9674260f7c7SSage Weil 968cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 969cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 970cb8e7090SChristoph Hellwig { 9712b0143b5SDavid Howells if (d_really_is_positive(child)) 972cb8e7090SChristoph Hellwig return -EEXIST; 973cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 974cb8e7090SChristoph Hellwig return -ENOENT; 97547291baaSChristian Brauner return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 976cb8e7090SChristoph Hellwig } 977cb8e7090SChristoph Hellwig 978cb8e7090SChristoph Hellwig /* 979cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 980cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 981cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 982cb8e7090SChristoph Hellwig */ 98392872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 98452f75f4fSDavid Sterba const char *name, int namelen, 98572fd032eSSage Weil struct btrfs_root *snap_src, 9869babda9fSNikolay Borisov bool readonly, 9878696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 988cb8e7090SChristoph Hellwig { 9892b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9900b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 991cb8e7090SChristoph Hellwig struct dentry *dentry; 992cb8e7090SChristoph Hellwig int error; 993cb8e7090SChristoph Hellwig 99400235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 99500235411SAl Viro if (error == -EINTR) 99600235411SAl Viro return error; 997cb8e7090SChristoph Hellwig 998cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 999cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 1000cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 1001cb8e7090SChristoph Hellwig goto out_unlock; 1002cb8e7090SChristoph Hellwig 100376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 1004cb8e7090SChristoph Hellwig if (error) 1005a874a63eSLiu Bo goto out_dput; 1006cb8e7090SChristoph Hellwig 10079c52057cSChris Mason /* 10089c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 10099c52057cSChris Mason * check for them now when we can safely fail 10109c52057cSChris Mason */ 10119c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 10129c52057cSChris Mason dir->i_ino, name, 10139c52057cSChris Mason namelen); 10149c52057cSChris Mason if (error) 10159c52057cSChris Mason goto out_dput; 10169c52057cSChris Mason 10170b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 101876dda93cSYan, Zheng 101976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 102076dda93cSYan, Zheng goto out_up_read; 102176dda93cSYan, Zheng 10229babda9fSNikolay Borisov if (snap_src) 10239babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 10249babda9fSNikolay Borisov else 10259babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 10269babda9fSNikolay Borisov 102776dda93cSYan, Zheng if (!error) 102876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 102976dda93cSYan, Zheng out_up_read: 10300b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1031cb8e7090SChristoph Hellwig out_dput: 1032cb8e7090SChristoph Hellwig dput(dentry); 1033cb8e7090SChristoph Hellwig out_unlock: 103464708539SJosef Bacik btrfs_inode_unlock(dir, 0); 1035cb8e7090SChristoph Hellwig return error; 1036cb8e7090SChristoph Hellwig } 1037cb8e7090SChristoph Hellwig 1038c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1039c11fbb6eSRobbie Ko const char *name, int namelen, 1040c11fbb6eSRobbie Ko struct btrfs_root *root, 1041c11fbb6eSRobbie Ko bool readonly, 1042c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1043c11fbb6eSRobbie Ko { 1044c11fbb6eSRobbie Ko int ret; 1045c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1046c11fbb6eSRobbie Ko 1047c11fbb6eSRobbie Ko /* 1048c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1049c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1050c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1051c11fbb6eSRobbie Ko */ 1052c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1053c11fbb6eSRobbie Ko 1054*f9baa501SFilipe Manana ret = btrfs_start_delalloc_snapshot(root, false); 1055c11fbb6eSRobbie Ko if (ret) 1056c11fbb6eSRobbie Ko goto out; 1057c11fbb6eSRobbie Ko 1058c11fbb6eSRobbie Ko /* 1059c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1060c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1061c11fbb6eSRobbie Ko * creation. 1062c11fbb6eSRobbie Ko */ 1063c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1064c11fbb6eSRobbie Ko snapshot_force_cow = true; 1065c11fbb6eSRobbie Ko 1066c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1067c11fbb6eSRobbie Ko 1068c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1069c11fbb6eSRobbie Ko root, readonly, inherit); 1070c11fbb6eSRobbie Ko out: 1071c11fbb6eSRobbie Ko if (snapshot_force_cow) 1072c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1073c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1074c11fbb6eSRobbie Ko return ret; 1075c11fbb6eSRobbie Ko } 1076c11fbb6eSRobbie Ko 10774cb5300bSChris Mason /* 10784cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10794cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10804cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10814cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10824cb5300bSChris Mason * part of the file 10834cb5300bSChris Mason */ 1084aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10854cb5300bSChris Mason { 10864cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10874cb5300bSChris Mason struct extent_map *em = NULL; 10884cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10894cb5300bSChris Mason u64 end; 10904cb5300bSChris Mason 10914cb5300bSChris Mason read_lock(&em_tree->lock); 109209cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10934cb5300bSChris Mason read_unlock(&em_tree->lock); 10944cb5300bSChris Mason 10954cb5300bSChris Mason if (em) { 10964cb5300bSChris Mason end = extent_map_end(em); 10974cb5300bSChris Mason free_extent_map(em); 10984cb5300bSChris Mason if (end - offset > thresh) 10994cb5300bSChris Mason return 0; 11004cb5300bSChris Mason } 11014cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 11024cb5300bSChris Mason thresh /= 2; 11034cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 11044cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 11054cb5300bSChris Mason if (end >= thresh) 11064cb5300bSChris Mason return 0; 11074cb5300bSChris Mason return 1; 11084cb5300bSChris Mason } 11094cb5300bSChris Mason 11104cb5300bSChris Mason /* 11114cb5300bSChris Mason * helper function to walk through a file and find extents 11124cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 11134cb5300bSChris Mason * 11144cb5300bSChris Mason * This is used by the defragging code to find new and small 11154cb5300bSChris Mason * extents 11164cb5300bSChris Mason */ 11174cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 11184cb5300bSChris Mason struct inode *inode, u64 newer_than, 1119aab110abSDavid Sterba u64 *off, u32 thresh) 11204cb5300bSChris Mason { 11214cb5300bSChris Mason struct btrfs_path *path; 11224cb5300bSChris Mason struct btrfs_key min_key; 11234cb5300bSChris Mason struct extent_buffer *leaf; 11244cb5300bSChris Mason struct btrfs_file_extent_item *extent; 11254cb5300bSChris Mason int type; 11264cb5300bSChris Mason int ret; 11274a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 11284cb5300bSChris Mason 11294cb5300bSChris Mason path = btrfs_alloc_path(); 11304cb5300bSChris Mason if (!path) 11314cb5300bSChris Mason return -ENOMEM; 11324cb5300bSChris Mason 1133a4689d2bSDavid Sterba min_key.objectid = ino; 11344cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 11354cb5300bSChris Mason min_key.offset = *off; 11364cb5300bSChris Mason 11374cb5300bSChris Mason while (1) { 11386174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 11394cb5300bSChris Mason if (ret != 0) 11404cb5300bSChris Mason goto none; 1141f094c9bdSFilipe Manana process_slot: 1142a4689d2bSDavid Sterba if (min_key.objectid != ino) 11434cb5300bSChris Mason goto none; 11444cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11454cb5300bSChris Mason goto none; 11464cb5300bSChris Mason 11474cb5300bSChris Mason leaf = path->nodes[0]; 11484cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11494cb5300bSChris Mason struct btrfs_file_extent_item); 11504cb5300bSChris Mason 11514cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11524cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11534cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11544cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11554cb5300bSChris Mason *off = min_key.offset; 11564cb5300bSChris Mason btrfs_free_path(path); 11574cb5300bSChris Mason return 0; 11584cb5300bSChris Mason } 11594cb5300bSChris Mason 1160f094c9bdSFilipe Manana path->slots[0]++; 1161f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1162f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1163f094c9bdSFilipe Manana goto process_slot; 1164f094c9bdSFilipe Manana } 1165f094c9bdSFilipe Manana 11664cb5300bSChris Mason if (min_key.offset == (u64)-1) 11674cb5300bSChris Mason goto none; 11684cb5300bSChris Mason 11694cb5300bSChris Mason min_key.offset++; 11704cb5300bSChris Mason btrfs_release_path(path); 11714cb5300bSChris Mason } 11724cb5300bSChris Mason none: 11734cb5300bSChris Mason btrfs_free_path(path); 11744cb5300bSChris Mason return -ENOENT; 11754cb5300bSChris Mason } 11764cb5300bSChris Mason 11776c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 117817ce6ef8SLiu Bo { 117917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1180940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11816c282eb4SLi Zefan struct extent_map *em; 118209cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1183940100a4SChris Mason 1184940100a4SChris Mason /* 1185940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1186940100a4SChris Mason * the full extent lock 1187940100a4SChris Mason */ 1188940100a4SChris Mason read_lock(&em_tree->lock); 1189940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1190940100a4SChris Mason read_unlock(&em_tree->lock); 1191940100a4SChris Mason 1192940100a4SChris Mason if (!em) { 1193308d9800SFilipe Manana struct extent_state *cached = NULL; 1194308d9800SFilipe Manana u64 end = start + len - 1; 1195308d9800SFilipe Manana 1196940100a4SChris Mason /* get the big lock and read metadata off disk */ 1197ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 119839b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1199e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1200940100a4SChris Mason 12016cf8bfbfSDan Carpenter if (IS_ERR(em)) 12026c282eb4SLi Zefan return NULL; 1203940100a4SChris Mason } 1204940100a4SChris Mason 12056c282eb4SLi Zefan return em; 12066c282eb4SLi Zefan } 12076c282eb4SLi Zefan 12086c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 12096c282eb4SLi Zefan { 12106c282eb4SLi Zefan struct extent_map *next; 12116c282eb4SLi Zefan bool ret = true; 12126c282eb4SLi Zefan 12136c282eb4SLi Zefan /* this is the last extent */ 12146c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12156c282eb4SLi Zefan return false; 12166c282eb4SLi Zefan 12176c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1218e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1219e9512d72SChris Mason ret = false; 1220e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1221ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 12226c282eb4SLi Zefan ret = false; 12236c282eb4SLi Zefan 12246c282eb4SLi Zefan free_extent_map(next); 12256c282eb4SLi Zefan return ret; 12266c282eb4SLi Zefan } 12276c282eb4SLi Zefan 1228aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1229a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1230a43a2111SAndrew Mahone int compress) 12316c282eb4SLi Zefan { 12326c282eb4SLi Zefan struct extent_map *em; 12336c282eb4SLi Zefan int ret = 1; 12346c282eb4SLi Zefan bool next_mergeable = true; 12354a3560c4SLiu Bo bool prev_mergeable = true; 12366c282eb4SLi Zefan 12376c282eb4SLi Zefan /* 12386c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 12396c282eb4SLi Zefan * defragging it 12406c282eb4SLi Zefan */ 12416c282eb4SLi Zefan if (start < *defrag_end) 12426c282eb4SLi Zefan return 1; 12436c282eb4SLi Zefan 12446c282eb4SLi Zefan *skip = 0; 12456c282eb4SLi Zefan 12466c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12476c282eb4SLi Zefan if (!em) 12486c282eb4SLi Zefan return 0; 12496c282eb4SLi Zefan 1250940100a4SChris Mason /* this will cover holes, and inline extents */ 125117ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1252940100a4SChris Mason ret = 0; 125317ce6ef8SLiu Bo goto out; 125417ce6ef8SLiu Bo } 125517ce6ef8SLiu Bo 12564a3560c4SLiu Bo if (!*defrag_end) 12574a3560c4SLiu Bo prev_mergeable = false; 12584a3560c4SLiu Bo 12596c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1260940100a4SChris Mason /* 12616c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12626c282eb4SLi Zefan * real extent, don't bother defragging it 1263940100a4SChris Mason */ 1264a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12654a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1266940100a4SChris Mason ret = 0; 126717ce6ef8SLiu Bo out: 1268940100a4SChris Mason /* 1269940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1270940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1271940100a4SChris Mason * so that the next tiny extent will force a defrag. 1272940100a4SChris Mason * 1273940100a4SChris Mason * The end result of this is that tiny extents before a single big 1274940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1275940100a4SChris Mason */ 1276940100a4SChris Mason if (ret) { 1277940100a4SChris Mason *defrag_end = extent_map_end(em); 1278940100a4SChris Mason } else { 1279940100a4SChris Mason *last_len = 0; 1280940100a4SChris Mason *skip = extent_map_end(em); 1281940100a4SChris Mason *defrag_end = 0; 1282940100a4SChris Mason } 1283940100a4SChris Mason 1284940100a4SChris Mason free_extent_map(em); 1285940100a4SChris Mason return ret; 1286940100a4SChris Mason } 1287940100a4SChris Mason 12884cb5300bSChris Mason /* 12894cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12904cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12914cb5300bSChris Mason * to COW and defrag. 12924cb5300bSChris Mason * 12934cb5300bSChris Mason * It also makes sure the delalloc code has enough 12944cb5300bSChris Mason * dirty data to avoid making new small extents as part 12954cb5300bSChris Mason * of the defrag 12964cb5300bSChris Mason * 12974cb5300bSChris Mason * It's a good idea to start RA on this range 12984cb5300bSChris Mason * before calling this. 12994cb5300bSChris Mason */ 13004cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 13014cb5300bSChris Mason struct page **pages, 13024cb5300bSChris Mason unsigned long start_index, 1303c41570c9SJustin Maggard unsigned long num_pages) 1304f46b5a66SChristoph Hellwig { 13054cb5300bSChris Mason unsigned long file_end; 13064cb5300bSChris Mason u64 isize = i_size_read(inode); 1307f46b5a66SChristoph Hellwig u64 page_start; 1308f46b5a66SChristoph Hellwig u64 page_end; 13091f12bd06SLiu Bo u64 page_cnt; 1310a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 13117f458a38SFilipe Manana u64 search_start; 13124cb5300bSChris Mason int ret; 13134cb5300bSChris Mason int i; 13144cb5300bSChris Mason int i_done; 13154cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 13164cb5300bSChris Mason struct extent_state *cached_state = NULL; 1317600a45e1SMiao Xie struct extent_io_tree *tree; 1318364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 13193b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 13204cb5300bSChris Mason 132109cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 13221f12bd06SLiu Bo if (!isize || start_index > file_end) 13231f12bd06SLiu Bo return 0; 13241f12bd06SLiu Bo 13251f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13264cb5300bSChris Mason 1327e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1328a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13294cb5300bSChris Mason if (ret) 13304cb5300bSChris Mason return ret; 13314cb5300bSChris Mason i_done = 0; 1332600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 13334cb5300bSChris Mason 13344cb5300bSChris Mason /* step one, lock all the pages */ 13351f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13364cb5300bSChris Mason struct page *page; 1337600a45e1SMiao Xie again: 1338a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 13393b16a4e3SJosef Bacik start_index + i, mask); 13404cb5300bSChris Mason if (!page) 13414cb5300bSChris Mason break; 13424cb5300bSChris Mason 134332443de3SQu Wenruo ret = set_page_extent_mapped(page); 134432443de3SQu Wenruo if (ret < 0) { 134532443de3SQu Wenruo unlock_page(page); 134632443de3SQu Wenruo put_page(page); 134732443de3SQu Wenruo break; 134832443de3SQu Wenruo } 134932443de3SQu Wenruo 1350600a45e1SMiao Xie page_start = page_offset(page); 135109cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1352600a45e1SMiao Xie while (1) { 1353308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1354ff13db41SDavid Sterba &cached_state); 1355c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1356600a45e1SMiao Xie page_start); 1357308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1358e43bbe5eSDavid Sterba &cached_state); 1359600a45e1SMiao Xie if (!ordered) 1360600a45e1SMiao Xie break; 1361600a45e1SMiao Xie 1362600a45e1SMiao Xie unlock_page(page); 1363c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1364600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1365600a45e1SMiao Xie lock_page(page); 13661f12bd06SLiu Bo /* 13671f12bd06SLiu Bo * we unlocked the page above, so we need check if 13681f12bd06SLiu Bo * it was released or not. 13691f12bd06SLiu Bo */ 13701f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13711f12bd06SLiu Bo unlock_page(page); 137209cbfeafSKirill A. Shutemov put_page(page); 13731f12bd06SLiu Bo goto again; 13741f12bd06SLiu Bo } 1375600a45e1SMiao Xie } 1376600a45e1SMiao Xie 13774cb5300bSChris Mason if (!PageUptodate(page)) { 13784cb5300bSChris Mason btrfs_readpage(NULL, page); 13794cb5300bSChris Mason lock_page(page); 13804cb5300bSChris Mason if (!PageUptodate(page)) { 13814cb5300bSChris Mason unlock_page(page); 138209cbfeafSKirill A. Shutemov put_page(page); 13834cb5300bSChris Mason ret = -EIO; 13844cb5300bSChris Mason break; 13854cb5300bSChris Mason } 13864cb5300bSChris Mason } 1387600a45e1SMiao Xie 1388600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1389600a45e1SMiao Xie unlock_page(page); 139009cbfeafSKirill A. Shutemov put_page(page); 1391600a45e1SMiao Xie goto again; 1392600a45e1SMiao Xie } 1393600a45e1SMiao Xie 13944cb5300bSChris Mason pages[i] = page; 13954cb5300bSChris Mason i_done++; 13964cb5300bSChris Mason } 13974cb5300bSChris Mason if (!i_done || ret) 13984cb5300bSChris Mason goto out; 13994cb5300bSChris Mason 14001751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 14014cb5300bSChris Mason goto out; 14024cb5300bSChris Mason 14034cb5300bSChris Mason /* 14044cb5300bSChris Mason * so now we have a nice long stream of locked 14054cb5300bSChris Mason * and up to date pages, lets wait on them 14064cb5300bSChris Mason */ 14074cb5300bSChris Mason for (i = 0; i < i_done; i++) 14084cb5300bSChris Mason wait_on_page_writeback(pages[i]); 14094cb5300bSChris Mason 14104cb5300bSChris Mason page_start = page_offset(pages[0]); 141109cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 14124cb5300bSChris Mason 14134cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1414ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 14157f458a38SFilipe Manana 14167f458a38SFilipe Manana /* 14177f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 14187f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 14197f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 14207f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 14217f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 14227f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 14237f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 14247f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 14257f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 14267f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 14277f458a38SFilipe Manana * out if that happened. 14287f458a38SFilipe Manana */ 14297f458a38SFilipe Manana search_start = page_start; 14307f458a38SFilipe Manana while (search_start < page_end) { 14317f458a38SFilipe Manana struct extent_map *em; 14327f458a38SFilipe Manana 14337f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 14347f458a38SFilipe Manana page_end - search_start); 14357f458a38SFilipe Manana if (IS_ERR(em)) { 14367f458a38SFilipe Manana ret = PTR_ERR(em); 14377f458a38SFilipe Manana goto out_unlock_range; 14387f458a38SFilipe Manana } 14397f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 14407f458a38SFilipe Manana free_extent_map(em); 14417f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 14427f458a38SFilipe Manana ret = 0; 14437f458a38SFilipe Manana goto out_unlock_range; 14447f458a38SFilipe Manana } 14457f458a38SFilipe Manana search_start = extent_map_end(em); 14467f458a38SFilipe Manana free_extent_map(em); 14477f458a38SFilipe Manana } 14487f458a38SFilipe Manana 14494cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1450e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1451e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 14524cb5300bSChris Mason 14531f12bd06SLiu Bo if (i_done != page_cnt) { 14549e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 145528c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 14569e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 145786d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1458a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 14594cb5300bSChris Mason } 14604cb5300bSChris Mason 14614cb5300bSChris Mason 14629e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1463018ed4f7SDavid Sterba &cached_state); 14644cb5300bSChris Mason 14654cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1466e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14674cb5300bSChris Mason 14684cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14694cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14704cb5300bSChris Mason ClearPageChecked(pages[i]); 14714cb5300bSChris Mason set_page_dirty(pages[i]); 14724cb5300bSChris Mason unlock_page(pages[i]); 147309cbfeafSKirill A. Shutemov put_page(pages[i]); 14744cb5300bSChris Mason } 14758702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1476364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14774cb5300bSChris Mason return i_done; 14787f458a38SFilipe Manana 14797f458a38SFilipe Manana out_unlock_range: 14807f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14817f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14824cb5300bSChris Mason out: 14834cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14844cb5300bSChris Mason unlock_page(pages[i]); 148509cbfeafSKirill A. Shutemov put_page(pages[i]); 14864cb5300bSChris Mason } 148786d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1488a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14898702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1490364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14914cb5300bSChris Mason return ret; 14924cb5300bSChris Mason 14934cb5300bSChris Mason } 14944cb5300bSChris Mason 14954cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14964cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14974cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14984cb5300bSChris Mason { 14990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 15004cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 15014cb5300bSChris Mason struct file_ra_state *ra = NULL; 15024cb5300bSChris Mason unsigned long last_index; 1503151a31b2SLi Zefan u64 isize = i_size_read(inode); 1504940100a4SChris Mason u64 last_len = 0; 1505940100a4SChris Mason u64 skip = 0; 1506940100a4SChris Mason u64 defrag_end = 0; 15074cb5300bSChris Mason u64 newer_off = range->start; 1508f46b5a66SChristoph Hellwig unsigned long i; 1509008873eaSLi Zefan unsigned long ra_index = 0; 1510f46b5a66SChristoph Hellwig int ret; 15114cb5300bSChris Mason int defrag_count = 0; 15121a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1513aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 151409cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1515c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1516ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 15174cb5300bSChris Mason struct page **pages = NULL; 15181e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 15194cb5300bSChris Mason 15200abd5b17SLiu Bo if (isize == 0) 15210abd5b17SLiu Bo return 0; 15220abd5b17SLiu Bo 15230abd5b17SLiu Bo if (range->start >= isize) 15240abd5b17SLiu Bo return -EINVAL; 15251a419d85SLi Zefan 15261e2ef46dSDavid Sterba if (do_compress) { 1527ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 15281a419d85SLi Zefan return -EINVAL; 15291a419d85SLi Zefan if (range->compress_type) 15301a419d85SLi Zefan compress_type = range->compress_type; 15311a419d85SLi Zefan } 1532f46b5a66SChristoph Hellwig 15330abd5b17SLiu Bo if (extent_thresh == 0) 1534ee22184bSByongho Lee extent_thresh = SZ_256K; 1535f46b5a66SChristoph Hellwig 15364cb5300bSChris Mason /* 15370a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 15380a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 15390a52d108SDavid Sterba * we don't error out. 15404cb5300bSChris Mason */ 15414cb5300bSChris Mason if (!file) { 154263e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 15430a52d108SDavid Sterba if (ra) 15444cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 15454cb5300bSChris Mason } else { 15464cb5300bSChris Mason ra = &file->f_ra; 15474cb5300bSChris Mason } 15484cb5300bSChris Mason 154963e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 15504cb5300bSChris Mason if (!pages) { 15514cb5300bSChris Mason ret = -ENOMEM; 15524cb5300bSChris Mason goto out_ra; 15534cb5300bSChris Mason } 15544cb5300bSChris Mason 15554cb5300bSChris Mason /* find the last page to defrag */ 15561e701a32SChris Mason if (range->start + range->len > range->start) { 1557151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 155809cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 15591e701a32SChris Mason } else { 156009cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 15611e701a32SChris Mason } 15621e701a32SChris Mason 15634cb5300bSChris Mason if (newer_than) { 15644cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1565ee22184bSByongho Lee &newer_off, SZ_64K); 15664cb5300bSChris Mason if (!ret) { 15674cb5300bSChris Mason range->start = newer_off; 15684cb5300bSChris Mason /* 15694cb5300bSChris Mason * we always align our defrag to help keep 15704cb5300bSChris Mason * the extents in the file evenly spaced 15714cb5300bSChris Mason */ 157209cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15734cb5300bSChris Mason } else 15744cb5300bSChris Mason goto out_ra; 15754cb5300bSChris Mason } else { 157609cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 15774cb5300bSChris Mason } 15784cb5300bSChris Mason if (!max_to_defrag) 1579070034bdSchandan max_to_defrag = last_index - i + 1; 15804cb5300bSChris Mason 15812a0f7f57SLi Zefan /* 15822a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 15832a0f7f57SLi Zefan * written sequentially. 15842a0f7f57SLi Zefan */ 15852a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 15862a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 15872a0f7f57SLi Zefan 1588f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 158909cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15904cb5300bSChris Mason /* 15914cb5300bSChris Mason * make sure we stop running if someone unmounts 15924cb5300bSChris Mason * the FS 15934cb5300bSChris Mason */ 15941751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15954cb5300bSChris Mason break; 15964cb5300bSChris Mason 15970b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15980b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1599210549ebSDavid Sterba ret = -EAGAIN; 1600210549ebSDavid Sterba break; 1601210549ebSDavid Sterba } 1602210549ebSDavid Sterba 160309cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 16046c282eb4SLi Zefan extent_thresh, &last_len, &skip, 16051e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1606940100a4SChris Mason unsigned long next; 1607940100a4SChris Mason /* 1608940100a4SChris Mason * the should_defrag function tells us how much to skip 1609940100a4SChris Mason * bump our counter by the suggested amount 1610940100a4SChris Mason */ 161109cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1612940100a4SChris Mason i = max(i + 1, next); 1613940100a4SChris Mason continue; 1614940100a4SChris Mason } 1615008873eaSLi Zefan 1616008873eaSLi Zefan if (!newer_than) { 161709cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 161809cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1619008873eaSLi Zefan cluster = min(cluster, max_cluster); 1620008873eaSLi Zefan } else { 1621008873eaSLi Zefan cluster = max_cluster; 1622008873eaSLi Zefan } 1623008873eaSLi Zefan 1624008873eaSLi Zefan if (i + cluster > ra_index) { 1625008873eaSLi Zefan ra_index = max(i, ra_index); 16260a52d108SDavid Sterba if (ra) 1627d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1628d3c0bab5SDavid Sterba file, ra_index, cluster); 1629e4826a5bSchandan ra_index += cluster; 1630008873eaSLi Zefan } 16314cb5300bSChris Mason 163264708539SJosef Bacik btrfs_inode_lock(inode, 0); 1633eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1634eede2bf3SOmar Sandoval ret = -ETXTBSY; 1635eede2bf3SOmar Sandoval } else { 16361e2ef46dSDavid Sterba if (do_compress) 1637eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1638008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1639eede2bf3SOmar Sandoval } 1640ecb8bea8SLiu Bo if (ret < 0) { 164164708539SJosef Bacik btrfs_inode_unlock(inode, 0); 16424cb5300bSChris Mason goto out_ra; 1643ecb8bea8SLiu Bo } 16444cb5300bSChris Mason 16454cb5300bSChris Mason defrag_count += ret; 1646d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 164764708539SJosef Bacik btrfs_inode_unlock(inode, 0); 16484cb5300bSChris Mason 16494cb5300bSChris Mason if (newer_than) { 16504cb5300bSChris Mason if (newer_off == (u64)-1) 16514cb5300bSChris Mason break; 16524cb5300bSChris Mason 1653e1f041e1SLiu Bo if (ret > 0) 1654e1f041e1SLiu Bo i += ret; 1655e1f041e1SLiu Bo 16564cb5300bSChris Mason newer_off = max(newer_off + 1, 165709cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 16584cb5300bSChris Mason 1659ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1660ee22184bSByongho Lee &newer_off, SZ_64K); 16614cb5300bSChris Mason if (!ret) { 16624cb5300bSChris Mason range->start = newer_off; 166309cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16644cb5300bSChris Mason } else { 16654cb5300bSChris Mason break; 1666940100a4SChris Mason } 16674cb5300bSChris Mason } else { 1668008873eaSLi Zefan if (ret > 0) { 1669cbcc8326SLi Zefan i += ret; 167009cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1671008873eaSLi Zefan } else { 1672940100a4SChris Mason i++; 1673008873eaSLi Zefan last_len = 0; 1674008873eaSLi Zefan } 1675f46b5a66SChristoph Hellwig } 16764cb5300bSChris Mason } 1677f46b5a66SChristoph Hellwig 1678dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 16791e701a32SChris Mason filemap_flush(inode->i_mapping); 1680dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1681dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1682dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1683dec8ef90SFilipe Manana } 16841e701a32SChris Mason 16851a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 16860b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16875c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16885c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16891a419d85SLi Zefan } 16901a419d85SLi Zefan 169160ccf82fSDiego Calleja ret = defrag_count; 1692940100a4SChris Mason 16934cb5300bSChris Mason out_ra: 16941e2ef46dSDavid Sterba if (do_compress) { 169564708539SJosef Bacik btrfs_inode_lock(inode, 0); 1696eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 169764708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1698633085c7SFilipe David Borba Manana } 16994cb5300bSChris Mason if (!file) 17004cb5300bSChris Mason kfree(ra); 17014cb5300bSChris Mason kfree(pages); 1702940100a4SChris Mason return ret; 1703f46b5a66SChristoph Hellwig } 1704f46b5a66SChristoph Hellwig 1705198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 170676dda93cSYan, Zheng void __user *arg) 1707f46b5a66SChristoph Hellwig { 17080b246afaSJeff Mahoney struct inode *inode = file_inode(file); 17090b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1710f46b5a66SChristoph Hellwig u64 new_size; 1711f46b5a66SChristoph Hellwig u64 old_size; 1712f46b5a66SChristoph Hellwig u64 devid = 1; 17130b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1714f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1715f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1716f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1717f46b5a66SChristoph Hellwig char *sizestr; 17189a40f122SGui Hecheng char *retptr; 1719f46b5a66SChristoph Hellwig char *devstr = NULL; 1720f46b5a66SChristoph Hellwig int ret = 0; 1721f46b5a66SChristoph Hellwig int mod = 0; 1722f46b5a66SChristoph Hellwig 1723e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1724e441d54dSChris Mason return -EPERM; 1725e441d54dSChris Mason 1726198605a8SMiao Xie ret = mnt_want_write_file(file); 1727198605a8SMiao Xie if (ret) 1728198605a8SMiao Xie return ret; 1729198605a8SMiao Xie 1730c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 173197547676SMiao Xie mnt_drop_write_file(file); 1732e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1733c9e9f97bSIlya Dryomov } 1734c9e9f97bSIlya Dryomov 1735dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1736c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1737c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1738c9e9f97bSIlya Dryomov goto out; 1739c9e9f97bSIlya Dryomov } 17405516e595SMark Fasheh 17415516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1742f46b5a66SChristoph Hellwig 1743f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1744f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1745f46b5a66SChristoph Hellwig if (devstr) { 1746f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1747f46b5a66SChristoph Hellwig *devstr = '\0'; 1748f46b5a66SChristoph Hellwig devstr = vol_args->name; 174958dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 175058dfae63SZhangZhen if (ret) 175158dfae63SZhangZhen goto out_free; 1752dfd79829SMiao Xie if (!devid) { 1753dfd79829SMiao Xie ret = -EINVAL; 1754dfd79829SMiao Xie goto out_free; 1755dfd79829SMiao Xie } 17560b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1757f46b5a66SChristoph Hellwig } 1758dba60f3fSMiao Xie 1759b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1760f46b5a66SChristoph Hellwig if (!device) { 17610b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1762c1c9ff7cSGeert Uytterhoeven devid); 1763dfd79829SMiao Xie ret = -ENODEV; 1764c9e9f97bSIlya Dryomov goto out_free; 1765f46b5a66SChristoph Hellwig } 1766dba60f3fSMiao Xie 1767ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17680b246afaSJeff Mahoney btrfs_info(fs_info, 1769efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1770c1c9ff7cSGeert Uytterhoeven devid); 1771dfd79829SMiao Xie ret = -EPERM; 17724e42ae1bSLiu Bo goto out_free; 17734e42ae1bSLiu Bo } 17744e42ae1bSLiu Bo 1775f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1776f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1777f46b5a66SChristoph Hellwig else { 1778f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1779f46b5a66SChristoph Hellwig mod = -1; 1780f46b5a66SChristoph Hellwig sizestr++; 1781f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1782f46b5a66SChristoph Hellwig mod = 1; 1783f46b5a66SChristoph Hellwig sizestr++; 1784f46b5a66SChristoph Hellwig } 17859a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17869a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1787f46b5a66SChristoph Hellwig ret = -EINVAL; 1788c9e9f97bSIlya Dryomov goto out_free; 1789f46b5a66SChristoph Hellwig } 1790f46b5a66SChristoph Hellwig } 1791f46b5a66SChristoph Hellwig 1792401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1793dfd79829SMiao Xie ret = -EPERM; 179463a212abSStefan Behrens goto out_free; 179563a212abSStefan Behrens } 179663a212abSStefan Behrens 17977cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1798f46b5a66SChristoph Hellwig 1799f46b5a66SChristoph Hellwig if (mod < 0) { 1800f46b5a66SChristoph Hellwig if (new_size > old_size) { 1801f46b5a66SChristoph Hellwig ret = -EINVAL; 1802c9e9f97bSIlya Dryomov goto out_free; 1803f46b5a66SChristoph Hellwig } 1804f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1805f46b5a66SChristoph Hellwig } else if (mod > 0) { 1806eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1807902c68a4SGui Hecheng ret = -ERANGE; 1808eb8052e0SWenliang Fan goto out_free; 1809eb8052e0SWenliang Fan } 1810f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1811f46b5a66SChristoph Hellwig } 1812f46b5a66SChristoph Hellwig 1813ee22184bSByongho Lee if (new_size < SZ_256M) { 1814f46b5a66SChristoph Hellwig ret = -EINVAL; 1815c9e9f97bSIlya Dryomov goto out_free; 1816f46b5a66SChristoph Hellwig } 1817f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1818f46b5a66SChristoph Hellwig ret = -EFBIG; 1819c9e9f97bSIlya Dryomov goto out_free; 1820f46b5a66SChristoph Hellwig } 1821f46b5a66SChristoph Hellwig 182247f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1823f46b5a66SChristoph Hellwig 1824f46b5a66SChristoph Hellwig if (new_size > old_size) { 1825a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 182698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 182798d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1828c9e9f97bSIlya Dryomov goto out_free; 182998d5dc13STsutomu Itoh } 1830f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 18313a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1832ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1833f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 18340253f40eSjeff.liu } /* equal, nothing need to do */ 1835f46b5a66SChristoph Hellwig 1836faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1837faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1838faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1839faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1840faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1841c9e9f97bSIlya Dryomov out_free: 1842f46b5a66SChristoph Hellwig kfree(vol_args); 1843c9e9f97bSIlya Dryomov out: 1844c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 184518f39c41SIlya Dryomov mnt_drop_write_file(file); 1846f46b5a66SChristoph Hellwig return ret; 1847f46b5a66SChristoph Hellwig } 1848f46b5a66SChristoph Hellwig 18495d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 185052f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18515d54c67eSNikolay Borisov bool readonly, 18528696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1853f46b5a66SChristoph Hellwig { 1854f46b5a66SChristoph Hellwig int namelen; 18553de4586cSChris Mason int ret = 0; 1856f46b5a66SChristoph Hellwig 1857325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1858325c50e3SJeff Mahoney return -ENOTDIR; 1859325c50e3SJeff Mahoney 1860a874a63eSLiu Bo ret = mnt_want_write_file(file); 1861a874a63eSLiu Bo if (ret) 1862a874a63eSLiu Bo goto out; 1863a874a63eSLiu Bo 186472fd032eSSage Weil namelen = strlen(name); 186572fd032eSSage Weil if (strchr(name, '/')) { 1866f46b5a66SChristoph Hellwig ret = -EINVAL; 1867a874a63eSLiu Bo goto out_drop_write; 1868f46b5a66SChristoph Hellwig } 1869f46b5a66SChristoph Hellwig 187016780cabSChris Mason if (name[0] == '.' && 187116780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 187216780cabSChris Mason ret = -EEXIST; 1873a874a63eSLiu Bo goto out_drop_write; 187416780cabSChris Mason } 187516780cabSChris Mason 18763de4586cSChris Mason if (subvol) { 187772fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18785d54c67eSNikolay Borisov NULL, readonly, inherit); 1879cb8e7090SChristoph Hellwig } else { 18802903ff01SAl Viro struct fd src = fdget(fd); 18813de4586cSChris Mason struct inode *src_inode; 18822903ff01SAl Viro if (!src.file) { 18833de4586cSChris Mason ret = -EINVAL; 1884a874a63eSLiu Bo goto out_drop_write; 18853de4586cSChris Mason } 18863de4586cSChris Mason 1887496ad9aaSAl Viro src_inode = file_inode(src.file); 1888496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1889c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1890efe120a0SFrank Holton "Snapshot src from another FS"); 189123ad5b17SKusanagi Kouichi ret = -EXDEV; 189221cb47beSChristian Brauner } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) { 1893d0242061SDavid Sterba /* 1894d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1895d0242061SDavid Sterba * are limited to own subvolumes only 1896d0242061SDavid Sterba */ 1897d0242061SDavid Sterba ret = -EPERM; 1898ecd18815SAl Viro } else { 1899c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 190072fd032eSSage Weil BTRFS_I(src_inode)->root, 19015d54c67eSNikolay Borisov readonly, inherit); 1902ecd18815SAl Viro } 19032903ff01SAl Viro fdput(src); 1904cb8e7090SChristoph Hellwig } 1905a874a63eSLiu Bo out_drop_write: 1906a874a63eSLiu Bo mnt_drop_write_file(file); 1907f46b5a66SChristoph Hellwig out: 190872fd032eSSage Weil return ret; 190972fd032eSSage Weil } 191072fd032eSSage Weil 191172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1912fa0d2b9bSLi Zefan void __user *arg, int subvol) 191372fd032eSSage Weil { 1914fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 191572fd032eSSage Weil int ret; 191672fd032eSSage Weil 1917325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1918325c50e3SJeff Mahoney return -ENOTDIR; 1919325c50e3SJeff Mahoney 1920fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1921fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1922fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1923fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1924fa0d2b9bSLi Zefan 19255d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19265d54c67eSNikolay Borisov subvol, false, NULL); 1927fa0d2b9bSLi Zefan 1928fa0d2b9bSLi Zefan kfree(vol_args); 1929fa0d2b9bSLi Zefan return ret; 1930fa0d2b9bSLi Zefan } 1931fa0d2b9bSLi Zefan 1932fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1933fa0d2b9bSLi Zefan void __user *arg, int subvol) 1934fa0d2b9bSLi Zefan { 1935fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1936fa0d2b9bSLi Zefan int ret; 1937b83cc969SLi Zefan bool readonly = false; 19386f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 193972fd032eSSage Weil 1940325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1941325c50e3SJeff Mahoney return -ENOTDIR; 1942325c50e3SJeff Mahoney 1943fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1944fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1945fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1946fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1947fdfb1e4fSLi Zefan 1948673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1949b83cc969SLi Zefan ret = -EOPNOTSUPP; 1950c47ca32dSDan Carpenter goto free_args; 1951fdfb1e4fSLi Zefan } 1952fdfb1e4fSLi Zefan 1953b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1954b83cc969SLi Zefan readonly = true; 19556f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 19565011c5a6SDan Carpenter u64 nums; 19575011c5a6SDan Carpenter 19585011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 19595011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 19606f72c7e2SArne Jansen ret = -EINVAL; 1961c47ca32dSDan Carpenter goto free_args; 19626f72c7e2SArne Jansen } 19636f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19646f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19656f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1966c47ca32dSDan Carpenter goto free_args; 19676f72c7e2SArne Jansen } 19685011c5a6SDan Carpenter 19695011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 19705011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 19715011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 19725011c5a6SDan Carpenter ret = -EINVAL; 19735011c5a6SDan Carpenter goto free_inherit; 19745011c5a6SDan Carpenter } 19755011c5a6SDan Carpenter 19765011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 19775011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 19785011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 19795011c5a6SDan Carpenter ret = -EINVAL; 19805011c5a6SDan Carpenter goto free_inherit; 19815011c5a6SDan Carpenter } 19826f72c7e2SArne Jansen } 198375eaa0e2SSage Weil 19845d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19855d54c67eSNikolay Borisov subvol, readonly, inherit); 1986c47ca32dSDan Carpenter if (ret) 1987c47ca32dSDan Carpenter goto free_inherit; 1988c47ca32dSDan Carpenter free_inherit: 19896f72c7e2SArne Jansen kfree(inherit); 1990c47ca32dSDan Carpenter free_args: 1991c47ca32dSDan Carpenter kfree(vol_args); 1992f46b5a66SChristoph Hellwig return ret; 1993f46b5a66SChristoph Hellwig } 1994f46b5a66SChristoph Hellwig 19950caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19960caa102dSLi Zefan void __user *arg) 19970caa102dSLi Zefan { 1998496ad9aaSAl Viro struct inode *inode = file_inode(file); 19990b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 20000caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 20010caa102dSLi Zefan int ret = 0; 20020caa102dSLi Zefan u64 flags = 0; 20030caa102dSLi Zefan 20044a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 20050caa102dSLi Zefan return -EINVAL; 20060caa102dSLi Zefan 20070b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 20080caa102dSLi Zefan if (btrfs_root_readonly(root)) 20090caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 20100b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 20110caa102dSLi Zefan 20120caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 20130caa102dSLi Zefan ret = -EFAULT; 20140caa102dSLi Zefan 20150caa102dSLi Zefan return ret; 20160caa102dSLi Zefan } 20170caa102dSLi Zefan 20180caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 20190caa102dSLi Zefan void __user *arg) 20200caa102dSLi Zefan { 2021496ad9aaSAl Viro struct inode *inode = file_inode(file); 20220b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 20230caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 20240caa102dSLi Zefan struct btrfs_trans_handle *trans; 20250caa102dSLi Zefan u64 root_flags; 20260caa102dSLi Zefan u64 flags; 20270caa102dSLi Zefan int ret = 0; 20280caa102dSLi Zefan 202921cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 2030bd60ea0fSDavid Sterba return -EPERM; 2031bd60ea0fSDavid Sterba 2032b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2033b9ca0664SLiu Bo if (ret) 2034b9ca0664SLiu Bo goto out; 20350caa102dSLi Zefan 20364a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2037b9ca0664SLiu Bo ret = -EINVAL; 2038b9ca0664SLiu Bo goto out_drop_write; 2039b9ca0664SLiu Bo } 20400caa102dSLi Zefan 2041b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2042b9ca0664SLiu Bo ret = -EFAULT; 2043b9ca0664SLiu Bo goto out_drop_write; 2044b9ca0664SLiu Bo } 20450caa102dSLi Zefan 2046b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2047b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2048b9ca0664SLiu Bo goto out_drop_write; 2049b9ca0664SLiu Bo } 20500caa102dSLi Zefan 20510b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20520caa102dSLi Zefan 20530caa102dSLi Zefan /* nothing to do */ 20540caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2055b9ca0664SLiu Bo goto out_drop_sem; 20560caa102dSLi Zefan 20570caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20582c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20590caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20600caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20612c686537SDavid Sterba } else { 20622c686537SDavid Sterba /* 20632c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20642c686537SDavid Sterba * send 20652c686537SDavid Sterba */ 20662c686537SDavid Sterba spin_lock(&root->root_item_lock); 20672c686537SDavid Sterba if (root->send_in_progress == 0) { 20680caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20690caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20702c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20712c686537SDavid Sterba } else { 20722c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20730b246afaSJeff Mahoney btrfs_warn(fs_info, 20742c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20752c686537SDavid Sterba root->root_key.objectid); 20762c686537SDavid Sterba ret = -EPERM; 20772c686537SDavid Sterba goto out_drop_sem; 20782c686537SDavid Sterba } 20792c686537SDavid Sterba } 20800caa102dSLi Zefan 20810caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20820caa102dSLi Zefan if (IS_ERR(trans)) { 20830caa102dSLi Zefan ret = PTR_ERR(trans); 20840caa102dSLi Zefan goto out_reset; 20850caa102dSLi Zefan } 20860caa102dSLi Zefan 20870b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20880caa102dSLi Zefan &root->root_key, &root->root_item); 20899417ebc8SNikolay Borisov if (ret < 0) { 20909417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20919417ebc8SNikolay Borisov goto out_reset; 20929417ebc8SNikolay Borisov } 20930caa102dSLi Zefan 20949417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20959417ebc8SNikolay Borisov 20960caa102dSLi Zefan out_reset: 20970caa102dSLi Zefan if (ret) 20980caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2099b9ca0664SLiu Bo out_drop_sem: 21000b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2101b9ca0664SLiu Bo out_drop_write: 2102b9ca0664SLiu Bo mnt_drop_write_file(file); 2103b9ca0664SLiu Bo out: 21040caa102dSLi Zefan return ret; 21050caa102dSLi Zefan } 21060caa102dSLi Zefan 2107ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2108ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2109ac8e9819SChris Mason { 2110abc6e134SChris Mason struct btrfs_key test; 2111abc6e134SChris Mason int ret; 2112abc6e134SChris Mason 2113abc6e134SChris Mason test.objectid = sk->min_objectid; 2114abc6e134SChris Mason test.type = sk->min_type; 2115abc6e134SChris Mason test.offset = sk->min_offset; 2116abc6e134SChris Mason 2117abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2118abc6e134SChris Mason if (ret < 0) 2119ac8e9819SChris Mason return 0; 2120abc6e134SChris Mason 2121abc6e134SChris Mason test.objectid = sk->max_objectid; 2122abc6e134SChris Mason test.type = sk->max_type; 2123abc6e134SChris Mason test.offset = sk->max_offset; 2124abc6e134SChris Mason 2125abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2126abc6e134SChris Mason if (ret > 0) 2127ac8e9819SChris Mason return 0; 2128ac8e9819SChris Mason return 1; 2129ac8e9819SChris Mason } 2130ac8e9819SChris Mason 2131df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2132ac8e9819SChris Mason struct btrfs_key *key, 2133ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 21349b6e817dSGerhard Heift size_t *buf_size, 2135ba346b35SGerhard Heift char __user *ubuf, 2136ac8e9819SChris Mason unsigned long *sk_offset, 2137ac8e9819SChris Mason int *num_found) 2138ac8e9819SChris Mason { 2139ac8e9819SChris Mason u64 found_transid; 2140ac8e9819SChris Mason struct extent_buffer *leaf; 2141ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2142dd81d459SNaohiro Aota struct btrfs_key test; 2143ac8e9819SChris Mason unsigned long item_off; 2144ac8e9819SChris Mason unsigned long item_len; 2145ac8e9819SChris Mason int nritems; 2146ac8e9819SChris Mason int i; 2147ac8e9819SChris Mason int slot; 2148ac8e9819SChris Mason int ret = 0; 2149ac8e9819SChris Mason 2150ac8e9819SChris Mason leaf = path->nodes[0]; 2151ac8e9819SChris Mason slot = path->slots[0]; 2152ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2153ac8e9819SChris Mason 2154ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2155ac8e9819SChris Mason i = nritems; 2156ac8e9819SChris Mason goto advance_key; 2157ac8e9819SChris Mason } 2158ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2159ac8e9819SChris Mason 2160ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2161ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2162ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2163ac8e9819SChris Mason 216403b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 216503b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 216603b71c6cSGabriel de Perthuis continue; 216703b71c6cSGabriel de Perthuis 21689b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21698f5f6178SGerhard Heift if (*num_found) { 2170ac8e9819SChris Mason ret = 1; 21718f5f6178SGerhard Heift goto out; 21728f5f6178SGerhard Heift } 21738f5f6178SGerhard Heift 21748f5f6178SGerhard Heift /* 21758f5f6178SGerhard Heift * return one empty item back for v1, which does not 21768f5f6178SGerhard Heift * handle -EOVERFLOW 21778f5f6178SGerhard Heift */ 21788f5f6178SGerhard Heift 21799b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2180ac8e9819SChris Mason item_len = 0; 21818f5f6178SGerhard Heift ret = -EOVERFLOW; 21828f5f6178SGerhard Heift } 2183ac8e9819SChris Mason 21849b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2185ac8e9819SChris Mason ret = 1; 218625c9bc2eSGerhard Heift goto out; 2187ac8e9819SChris Mason } 2188ac8e9819SChris Mason 2189ac8e9819SChris Mason sh.objectid = key->objectid; 2190ac8e9819SChris Mason sh.offset = key->offset; 2191ac8e9819SChris Mason sh.type = key->type; 2192ac8e9819SChris Mason sh.len = item_len; 2193ac8e9819SChris Mason sh.transid = found_transid; 2194ac8e9819SChris Mason 2195a48b73ecSJosef Bacik /* 2196a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2197a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2198a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2199a48b73ecSJosef Bacik * properly this next time through 2200a48b73ecSJosef Bacik */ 2201a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2202a48b73ecSJosef Bacik ret = 0; 2203ba346b35SGerhard Heift goto out; 2204ba346b35SGerhard Heift } 2205ba346b35SGerhard Heift 2206ac8e9819SChris Mason *sk_offset += sizeof(sh); 2207ac8e9819SChris Mason 2208ac8e9819SChris Mason if (item_len) { 2209ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2210a48b73ecSJosef Bacik /* 2211a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2212a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2213a48b73ecSJosef Bacik */ 2214a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2215ba346b35SGerhard Heift item_off, item_len)) { 2216a48b73ecSJosef Bacik ret = 0; 2217a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2218ba346b35SGerhard Heift goto out; 2219ba346b35SGerhard Heift } 2220ba346b35SGerhard Heift 2221ac8e9819SChris Mason *sk_offset += item_len; 2222ac8e9819SChris Mason } 2223e2156867SHugo Mills (*num_found)++; 2224ac8e9819SChris Mason 22258f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 22268f5f6178SGerhard Heift goto out; 22278f5f6178SGerhard Heift 222825c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 222925c9bc2eSGerhard Heift ret = 1; 223025c9bc2eSGerhard Heift goto out; 223125c9bc2eSGerhard Heift } 2232ac8e9819SChris Mason } 2233ac8e9819SChris Mason advance_key: 2234ac8e9819SChris Mason ret = 0; 2235dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2236dd81d459SNaohiro Aota test.type = sk->max_type; 2237dd81d459SNaohiro Aota test.offset = sk->max_offset; 2238dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2239dd81d459SNaohiro Aota ret = 1; 2240dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2241abc6e134SChris Mason key->offset++; 2242dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2243abc6e134SChris Mason key->offset = 0; 2244abc6e134SChris Mason key->type++; 2245dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2246abc6e134SChris Mason key->offset = 0; 2247abc6e134SChris Mason key->type = 0; 2248abc6e134SChris Mason key->objectid++; 2249abc6e134SChris Mason } else 2250abc6e134SChris Mason ret = 1; 225125c9bc2eSGerhard Heift out: 2252ba346b35SGerhard Heift /* 2253ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2254ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2255ba346b35SGerhard Heift * * all items were found 2256ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2257ba346b35SGerhard Heift * leaf 2258ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2259ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2260ba346b35SGerhard Heift */ 2261ac8e9819SChris Mason return ret; 2262ac8e9819SChris Mason } 2263ac8e9819SChris Mason 2264ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 226512544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22669b6e817dSGerhard Heift size_t *buf_size, 2267ba346b35SGerhard Heift char __user *ubuf) 2268ac8e9819SChris Mason { 22690b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2270ac8e9819SChris Mason struct btrfs_root *root; 2271ac8e9819SChris Mason struct btrfs_key key; 2272ac8e9819SChris Mason struct btrfs_path *path; 2273ac8e9819SChris Mason int ret; 2274ac8e9819SChris Mason int num_found = 0; 2275ac8e9819SChris Mason unsigned long sk_offset = 0; 2276ac8e9819SChris Mason 22779b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22789b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 227912544442SGerhard Heift return -EOVERFLOW; 22809b6e817dSGerhard Heift } 228112544442SGerhard Heift 2282ac8e9819SChris Mason path = btrfs_alloc_path(); 2283ac8e9819SChris Mason if (!path) 2284ac8e9819SChris Mason return -ENOMEM; 2285ac8e9819SChris Mason 2286ac8e9819SChris Mason if (sk->tree_id == 0) { 2287ac8e9819SChris Mason /* search the root of the inode that was passed */ 228800246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2289ac8e9819SChris Mason } else { 229056e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2291ac8e9819SChris Mason if (IS_ERR(root)) { 2292ac8e9819SChris Mason btrfs_free_path(path); 2293ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2294ac8e9819SChris Mason } 2295ac8e9819SChris Mason } 2296ac8e9819SChris Mason 2297ac8e9819SChris Mason key.objectid = sk->min_objectid; 2298ac8e9819SChris Mason key.type = sk->min_type; 2299ac8e9819SChris Mason key.offset = sk->min_offset; 2300ac8e9819SChris Mason 2301ac8e9819SChris Mason while (1) { 23021c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 23031c78544eSFilipe Manana *buf_size - sk_offset); 2304a48b73ecSJosef Bacik if (ret) 2305a48b73ecSJosef Bacik break; 2306a48b73ecSJosef Bacik 23076174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2308ac8e9819SChris Mason if (ret != 0) { 2309ac8e9819SChris Mason if (ret > 0) 2310ac8e9819SChris Mason ret = 0; 2311ac8e9819SChris Mason goto err; 2312ac8e9819SChris Mason } 2313df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2314ac8e9819SChris Mason &sk_offset, &num_found); 2315b3b4aa74SDavid Sterba btrfs_release_path(path); 231625c9bc2eSGerhard Heift if (ret) 2317ac8e9819SChris Mason break; 2318ac8e9819SChris Mason 2319ac8e9819SChris Mason } 23208f5f6178SGerhard Heift if (ret > 0) 2321ac8e9819SChris Mason ret = 0; 2322ac8e9819SChris Mason err: 2323ac8e9819SChris Mason sk->nr_items = num_found; 232400246528SJosef Bacik btrfs_put_root(root); 2325ac8e9819SChris Mason btrfs_free_path(path); 2326ac8e9819SChris Mason return ret; 2327ac8e9819SChris Mason } 2328ac8e9819SChris Mason 2329ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2330ac8e9819SChris Mason void __user *argp) 2331ac8e9819SChris Mason { 2332ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2333ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2334ac8e9819SChris Mason struct inode *inode; 2335ac8e9819SChris Mason int ret; 23369b6e817dSGerhard Heift size_t buf_size; 2337ac8e9819SChris Mason 2338ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2339ac8e9819SChris Mason return -EPERM; 2340ac8e9819SChris Mason 2341ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2342ac8e9819SChris Mason 2343ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2344ba346b35SGerhard Heift return -EFAULT; 2345ba346b35SGerhard Heift 2346ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2347ac8e9819SChris Mason 2348496ad9aaSAl Viro inode = file_inode(file); 2349ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23508f5f6178SGerhard Heift 23518f5f6178SGerhard Heift /* 23528f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23538f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23548f5f6178SGerhard Heift */ 23558f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23568f5f6178SGerhard Heift ret = 0; 23578f5f6178SGerhard Heift 2358ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2359ac8e9819SChris Mason ret = -EFAULT; 2360ac8e9819SChris Mason return ret; 2361ac8e9819SChris Mason } 2362ac8e9819SChris Mason 2363cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2364cc68a8a5SGerhard Heift void __user *argp) 2365cc68a8a5SGerhard Heift { 2366cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2367cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2368cc68a8a5SGerhard Heift struct inode *inode; 2369cc68a8a5SGerhard Heift int ret; 2370cc68a8a5SGerhard Heift size_t buf_size; 2371ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2372cc68a8a5SGerhard Heift 2373cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2374cc68a8a5SGerhard Heift return -EPERM; 2375cc68a8a5SGerhard Heift 2376cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2377cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2378cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2379cc68a8a5SGerhard Heift return -EFAULT; 2380cc68a8a5SGerhard Heift 2381cc68a8a5SGerhard Heift buf_size = args.buf_size; 2382cc68a8a5SGerhard Heift 2383cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2384cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2385cc68a8a5SGerhard Heift buf_size = buf_limit; 2386cc68a8a5SGerhard Heift 2387cc68a8a5SGerhard Heift inode = file_inode(file); 2388cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2389718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2390cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2391cc68a8a5SGerhard Heift ret = -EFAULT; 2392cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2393cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2394cc68a8a5SGerhard Heift ret = -EFAULT; 2395cc68a8a5SGerhard Heift 239676dda93cSYan, Zheng return ret; 239776dda93cSYan, Zheng } 239876dda93cSYan, Zheng 239998d377a0STARUISI Hiroaki /* 2400ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2401ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 240298d377a0STARUISI Hiroaki */ 240398d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 240498d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 240598d377a0STARUISI Hiroaki { 240698d377a0STARUISI Hiroaki struct btrfs_root *root; 240798d377a0STARUISI Hiroaki struct btrfs_key key; 2408ac8e9819SChris Mason char *ptr; 240998d377a0STARUISI Hiroaki int ret = -1; 241098d377a0STARUISI Hiroaki int slot; 241198d377a0STARUISI Hiroaki int len; 241298d377a0STARUISI Hiroaki int total_len = 0; 241398d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 241498d377a0STARUISI Hiroaki struct extent_buffer *l; 241598d377a0STARUISI Hiroaki struct btrfs_path *path; 241698d377a0STARUISI Hiroaki 241798d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 241898d377a0STARUISI Hiroaki name[0]='\0'; 241998d377a0STARUISI Hiroaki return 0; 242098d377a0STARUISI Hiroaki } 242198d377a0STARUISI Hiroaki 242298d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 242398d377a0STARUISI Hiroaki if (!path) 242498d377a0STARUISI Hiroaki return -ENOMEM; 242598d377a0STARUISI Hiroaki 2426c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 242798d377a0STARUISI Hiroaki 242856e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 242998d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2430ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 243188234012SJosef Bacik root = NULL; 243288234012SJosef Bacik goto out; 243388234012SJosef Bacik } 243498d377a0STARUISI Hiroaki 243598d377a0STARUISI Hiroaki key.objectid = dirid; 243698d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 24378ad6fcabSChris Mason key.offset = (u64)-1; 243898d377a0STARUISI Hiroaki 243998d377a0STARUISI Hiroaki while (1) { 244098d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 244198d377a0STARUISI Hiroaki if (ret < 0) 244298d377a0STARUISI Hiroaki goto out; 244318674c6cSFilipe David Borba Manana else if (ret > 0) { 244418674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 244518674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 244618674c6cSFilipe David Borba Manana if (ret < 0) 244718674c6cSFilipe David Borba Manana goto out; 244818674c6cSFilipe David Borba Manana else if (ret > 0) { 2449ac8e9819SChris Mason ret = -ENOENT; 245098d377a0STARUISI Hiroaki goto out; 2451ac8e9819SChris Mason } 245218674c6cSFilipe David Borba Manana } 245318674c6cSFilipe David Borba Manana 245418674c6cSFilipe David Borba Manana l = path->nodes[0]; 245518674c6cSFilipe David Borba Manana slot = path->slots[0]; 245618674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 245798d377a0STARUISI Hiroaki 245898d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 245998d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 246098d377a0STARUISI Hiroaki ptr -= len + 1; 246198d377a0STARUISI Hiroaki total_len += len + 1; 2462a696cf35SFilipe David Borba Manana if (ptr < name) { 2463a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 246498d377a0STARUISI Hiroaki goto out; 2465a696cf35SFilipe David Borba Manana } 246698d377a0STARUISI Hiroaki 246798d377a0STARUISI Hiroaki *(ptr + len) = '/'; 246898d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 246998d377a0STARUISI Hiroaki 247098d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 247198d377a0STARUISI Hiroaki break; 247298d377a0STARUISI Hiroaki 2473b3b4aa74SDavid Sterba btrfs_release_path(path); 247498d377a0STARUISI Hiroaki key.objectid = key.offset; 24758ad6fcabSChris Mason key.offset = (u64)-1; 247698d377a0STARUISI Hiroaki dirid = key.objectid; 247798d377a0STARUISI Hiroaki } 247877906a50SLi Zefan memmove(name, ptr, total_len); 247998d377a0STARUISI Hiroaki name[total_len] = '\0'; 248098d377a0STARUISI Hiroaki ret = 0; 248198d377a0STARUISI Hiroaki out: 248200246528SJosef Bacik btrfs_put_root(root); 248398d377a0STARUISI Hiroaki btrfs_free_path(path); 2484ac8e9819SChris Mason return ret; 2485ac8e9819SChris Mason } 2486ac8e9819SChris Mason 248723d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 248823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 248923d0b79dSTomohiro Misono { 249023d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 249123d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 249223d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 249323d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 249423d0b79dSTomohiro Misono u64 dirid = args->dirid; 249523d0b79dSTomohiro Misono unsigned long item_off; 249623d0b79dSTomohiro Misono unsigned long item_len; 249723d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 249823d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2499b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 250023d0b79dSTomohiro Misono struct btrfs_path *path; 250123d0b79dSTomohiro Misono struct btrfs_key key, key2; 250223d0b79dSTomohiro Misono struct extent_buffer *leaf; 250323d0b79dSTomohiro Misono struct inode *temp_inode; 250423d0b79dSTomohiro Misono char *ptr; 250523d0b79dSTomohiro Misono int slot; 250623d0b79dSTomohiro Misono int len; 250723d0b79dSTomohiro Misono int total_len = 0; 250823d0b79dSTomohiro Misono int ret; 250923d0b79dSTomohiro Misono 251023d0b79dSTomohiro Misono path = btrfs_alloc_path(); 251123d0b79dSTomohiro Misono if (!path) 251223d0b79dSTomohiro Misono return -ENOMEM; 251323d0b79dSTomohiro Misono 251423d0b79dSTomohiro Misono /* 251523d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 251623d0b79dSTomohiro Misono * construct the path in from the bottom up. 251723d0b79dSTomohiro Misono */ 251823d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 251923d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 252023d0b79dSTomohiro Misono 252156e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 252223d0b79dSTomohiro Misono if (IS_ERR(root)) { 252323d0b79dSTomohiro Misono ret = PTR_ERR(root); 252423d0b79dSTomohiro Misono goto out; 252523d0b79dSTomohiro Misono } 252623d0b79dSTomohiro Misono 252723d0b79dSTomohiro Misono key.objectid = dirid; 252823d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 252923d0b79dSTomohiro Misono key.offset = (u64)-1; 253023d0b79dSTomohiro Misono while (1) { 253123d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 253223d0b79dSTomohiro Misono if (ret < 0) { 2533b8a49ae1SJosef Bacik goto out_put; 253423d0b79dSTomohiro Misono } else if (ret > 0) { 253523d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 253623d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 253723d0b79dSTomohiro Misono if (ret < 0) { 2538b8a49ae1SJosef Bacik goto out_put; 253923d0b79dSTomohiro Misono } else if (ret > 0) { 254023d0b79dSTomohiro Misono ret = -ENOENT; 2541b8a49ae1SJosef Bacik goto out_put; 254223d0b79dSTomohiro Misono } 254323d0b79dSTomohiro Misono } 254423d0b79dSTomohiro Misono 254523d0b79dSTomohiro Misono leaf = path->nodes[0]; 254623d0b79dSTomohiro Misono slot = path->slots[0]; 254723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 254823d0b79dSTomohiro Misono 254923d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 255023d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 255123d0b79dSTomohiro Misono ptr -= len + 1; 255223d0b79dSTomohiro Misono total_len += len + 1; 255323d0b79dSTomohiro Misono if (ptr < args->path) { 255423d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2555b8a49ae1SJosef Bacik goto out_put; 255623d0b79dSTomohiro Misono } 255723d0b79dSTomohiro Misono 255823d0b79dSTomohiro Misono *(ptr + len) = '/'; 255923d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 256023d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 256123d0b79dSTomohiro Misono 256223d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 256323d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 256423d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 256523d0b79dSTomohiro Misono if (ret < 0) { 2566b8a49ae1SJosef Bacik goto out_put; 256723d0b79dSTomohiro Misono } else if (ret > 0) { 256823d0b79dSTomohiro Misono ret = -ENOENT; 2569b8a49ae1SJosef Bacik goto out_put; 257023d0b79dSTomohiro Misono } 257123d0b79dSTomohiro Misono 257223d0b79dSTomohiro Misono leaf = path->nodes[0]; 257323d0b79dSTomohiro Misono slot = path->slots[0]; 257423d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 257523d0b79dSTomohiro Misono if (key2.objectid != dirid) { 257623d0b79dSTomohiro Misono ret = -ENOENT; 2577b8a49ae1SJosef Bacik goto out_put; 257823d0b79dSTomohiro Misono } 257923d0b79dSTomohiro Misono 25800202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25813ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25823ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2583b8a49ae1SJosef Bacik goto out_put; 25843ca57bd6SMisono Tomohiro } 258547291baaSChristian Brauner ret = inode_permission(&init_user_ns, temp_inode, 258647291baaSChristian Brauner MAY_READ | MAY_EXEC); 258723d0b79dSTomohiro Misono iput(temp_inode); 258823d0b79dSTomohiro Misono if (ret) { 258923d0b79dSTomohiro Misono ret = -EACCES; 2590b8a49ae1SJosef Bacik goto out_put; 259123d0b79dSTomohiro Misono } 259223d0b79dSTomohiro Misono 259323d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 259423d0b79dSTomohiro Misono break; 259523d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 259623d0b79dSTomohiro Misono ret = -EACCES; 2597b8a49ae1SJosef Bacik goto out_put; 259823d0b79dSTomohiro Misono } 259923d0b79dSTomohiro Misono 260023d0b79dSTomohiro Misono btrfs_release_path(path); 260123d0b79dSTomohiro Misono key.objectid = key.offset; 260223d0b79dSTomohiro Misono key.offset = (u64)-1; 260323d0b79dSTomohiro Misono dirid = key.objectid; 260423d0b79dSTomohiro Misono } 260523d0b79dSTomohiro Misono 260623d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 260723d0b79dSTomohiro Misono args->path[total_len] = '\0'; 260800246528SJosef Bacik btrfs_put_root(root); 2609b8a49ae1SJosef Bacik root = NULL; 261023d0b79dSTomohiro Misono btrfs_release_path(path); 261123d0b79dSTomohiro Misono } 261223d0b79dSTomohiro Misono 261323d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 261423d0b79dSTomohiro Misono key.objectid = treeid; 261523d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 261623d0b79dSTomohiro Misono key.offset = args->treeid; 2617b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 261823d0b79dSTomohiro Misono if (ret < 0) { 261923d0b79dSTomohiro Misono goto out; 262023d0b79dSTomohiro Misono } else if (ret > 0) { 262123d0b79dSTomohiro Misono ret = -ENOENT; 262223d0b79dSTomohiro Misono goto out; 262323d0b79dSTomohiro Misono } 262423d0b79dSTomohiro Misono 262523d0b79dSTomohiro Misono leaf = path->nodes[0]; 262623d0b79dSTomohiro Misono slot = path->slots[0]; 262723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 262823d0b79dSTomohiro Misono 262923d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 263023d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 263123d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 263223d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 263323d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 263423d0b79dSTomohiro Misono ret = -EINVAL; 263523d0b79dSTomohiro Misono goto out; 263623d0b79dSTomohiro Misono } 263723d0b79dSTomohiro Misono 263823d0b79dSTomohiro Misono /* Copy subvolume's name */ 263923d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 264023d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 264123d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 264223d0b79dSTomohiro Misono args->name[item_len] = 0; 264323d0b79dSTomohiro Misono 2644b8a49ae1SJosef Bacik out_put: 264500246528SJosef Bacik btrfs_put_root(root); 264623d0b79dSTomohiro Misono out: 264723d0b79dSTomohiro Misono btrfs_free_path(path); 264823d0b79dSTomohiro Misono return ret; 264923d0b79dSTomohiro Misono } 265023d0b79dSTomohiro Misono 2651ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2652ac8e9819SChris Mason void __user *argp) 2653ac8e9819SChris Mason { 2654ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2655ac8e9819SChris Mason struct inode *inode; 265601b810b8SDavid Sterba int ret = 0; 2657ac8e9819SChris Mason 26582354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26592354d08fSJulia Lawall if (IS_ERR(args)) 26602354d08fSJulia Lawall return PTR_ERR(args); 2661c2b96929SDan Carpenter 2662496ad9aaSAl Viro inode = file_inode(file); 2663ac8e9819SChris Mason 266401b810b8SDavid Sterba /* 266501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 266601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 266701b810b8SDavid Sterba */ 26681b53ac4dSChris Mason if (args->treeid == 0) 26691b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26701b53ac4dSChris Mason 267101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 267201b810b8SDavid Sterba args->name[0] = 0; 267301b810b8SDavid Sterba goto out; 267401b810b8SDavid Sterba } 267501b810b8SDavid Sterba 267601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 267701b810b8SDavid Sterba ret = -EPERM; 267801b810b8SDavid Sterba goto out; 267901b810b8SDavid Sterba } 268001b810b8SDavid Sterba 2681ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2682ac8e9819SChris Mason args->treeid, args->objectid, 2683ac8e9819SChris Mason args->name); 2684ac8e9819SChris Mason 268501b810b8SDavid Sterba out: 2686ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2687ac8e9819SChris Mason ret = -EFAULT; 2688ac8e9819SChris Mason 2689ac8e9819SChris Mason kfree(args); 269098d377a0STARUISI Hiroaki return ret; 269198d377a0STARUISI Hiroaki } 269298d377a0STARUISI Hiroaki 269323d0b79dSTomohiro Misono /* 269423d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 269523d0b79dSTomohiro Misono * 269623d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 269723d0b79dSTomohiro Misono * 269823d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 269923d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 270023d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 270123d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 270223d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 270323d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 270423d0b79dSTomohiro Misono */ 270523d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 270623d0b79dSTomohiro Misono { 270723d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 270823d0b79dSTomohiro Misono struct inode *inode; 270923d0b79dSTomohiro Misono int ret; 271023d0b79dSTomohiro Misono 271123d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 271223d0b79dSTomohiro Misono if (IS_ERR(args)) 271323d0b79dSTomohiro Misono return PTR_ERR(args); 271423d0b79dSTomohiro Misono 271523d0b79dSTomohiro Misono inode = file_inode(file); 271623d0b79dSTomohiro Misono 271723d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 271823d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 271923d0b79dSTomohiro Misono /* 272023d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 272123d0b79dSTomohiro Misono * called 272223d0b79dSTomohiro Misono */ 272323d0b79dSTomohiro Misono kfree(args); 272423d0b79dSTomohiro Misono return -EACCES; 272523d0b79dSTomohiro Misono } 272623d0b79dSTomohiro Misono 272723d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 272823d0b79dSTomohiro Misono 272923d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 273023d0b79dSTomohiro Misono ret = -EFAULT; 273123d0b79dSTomohiro Misono 273223d0b79dSTomohiro Misono kfree(args); 273323d0b79dSTomohiro Misono return ret; 273423d0b79dSTomohiro Misono } 273523d0b79dSTomohiro Misono 2736b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2737b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2738b64ec075STomohiro Misono { 2739b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2740b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2741b64ec075STomohiro Misono struct btrfs_root *root; 2742b64ec075STomohiro Misono struct btrfs_path *path; 2743b64ec075STomohiro Misono struct btrfs_key key; 2744b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2745b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2746b64ec075STomohiro Misono struct extent_buffer *leaf; 2747b64ec075STomohiro Misono unsigned long item_off; 2748b64ec075STomohiro Misono unsigned long item_len; 2749b64ec075STomohiro Misono struct inode *inode; 2750b64ec075STomohiro Misono int slot; 2751b64ec075STomohiro Misono int ret = 0; 2752b64ec075STomohiro Misono 2753b64ec075STomohiro Misono path = btrfs_alloc_path(); 2754b64ec075STomohiro Misono if (!path) 2755b64ec075STomohiro Misono return -ENOMEM; 2756b64ec075STomohiro Misono 2757b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2758b64ec075STomohiro Misono if (!subvol_info) { 2759b64ec075STomohiro Misono btrfs_free_path(path); 2760b64ec075STomohiro Misono return -ENOMEM; 2761b64ec075STomohiro Misono } 2762b64ec075STomohiro Misono 2763b64ec075STomohiro Misono inode = file_inode(file); 2764b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2765b64ec075STomohiro Misono 2766b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2767b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 276856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2769b64ec075STomohiro Misono if (IS_ERR(root)) { 2770b64ec075STomohiro Misono ret = PTR_ERR(root); 277104734e84SJosef Bacik goto out_free; 277204734e84SJosef Bacik } 2773b64ec075STomohiro Misono root_item = &root->root_item; 2774b64ec075STomohiro Misono 2775b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2776b64ec075STomohiro Misono 2777b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2778b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2779b64ec075STomohiro Misono 2780b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2781b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2782b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2783b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2784b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2785b64ec075STomohiro Misono 2786b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2787b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2788b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2789b64ec075STomohiro Misono 2790b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2791b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2792b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2793b64ec075STomohiro Misono 2794b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2795b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2796b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2797b64ec075STomohiro Misono 2798b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2799b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2800b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2801b64ec075STomohiro Misono 2802b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2803b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2804b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2805b64ec075STomohiro Misono key.offset = 0; 280604734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2807b64ec075STomohiro Misono if (ret < 0) { 2808b64ec075STomohiro Misono goto out; 2809b64ec075STomohiro Misono } else if (path->slots[0] >= 2810b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 281104734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2812b64ec075STomohiro Misono if (ret < 0) { 2813b64ec075STomohiro Misono goto out; 2814b64ec075STomohiro Misono } else if (ret > 0) { 2815b64ec075STomohiro Misono ret = -EUCLEAN; 2816b64ec075STomohiro Misono goto out; 2817b64ec075STomohiro Misono } 2818b64ec075STomohiro Misono } 2819b64ec075STomohiro Misono 2820b64ec075STomohiro Misono leaf = path->nodes[0]; 2821b64ec075STomohiro Misono slot = path->slots[0]; 2822b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2823b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2824b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2825b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2826b64ec075STomohiro Misono 2827b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2828b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2829b64ec075STomohiro Misono 2830b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2831b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2832b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2833b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2834b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2835b64ec075STomohiro Misono item_off, item_len); 2836b64ec075STomohiro Misono } else { 2837b64ec075STomohiro Misono ret = -ENOENT; 2838b64ec075STomohiro Misono goto out; 2839b64ec075STomohiro Misono } 2840b64ec075STomohiro Misono } 2841b64ec075STomohiro Misono 2842b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2843b64ec075STomohiro Misono ret = -EFAULT; 2844b64ec075STomohiro Misono 2845b64ec075STomohiro Misono out: 284600246528SJosef Bacik btrfs_put_root(root); 284704734e84SJosef Bacik out_free: 2848b64ec075STomohiro Misono btrfs_free_path(path); 2849b091f7feSWaiman Long kfree(subvol_info); 2850b64ec075STomohiro Misono return ret; 2851b64ec075STomohiro Misono } 2852b64ec075STomohiro Misono 285342e4b520STomohiro Misono /* 285442e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 285542e4b520STomohiro Misono * except the subvolume name. 285642e4b520STomohiro Misono */ 285742e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 285842e4b520STomohiro Misono { 285942e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 286042e4b520STomohiro Misono struct btrfs_root_ref *rref; 286142e4b520STomohiro Misono struct btrfs_root *root; 286242e4b520STomohiro Misono struct btrfs_path *path; 286342e4b520STomohiro Misono struct btrfs_key key; 286442e4b520STomohiro Misono struct extent_buffer *leaf; 286542e4b520STomohiro Misono struct inode *inode; 286642e4b520STomohiro Misono u64 objectid; 286742e4b520STomohiro Misono int slot; 286842e4b520STomohiro Misono int ret; 286942e4b520STomohiro Misono u8 found; 287042e4b520STomohiro Misono 287142e4b520STomohiro Misono path = btrfs_alloc_path(); 287242e4b520STomohiro Misono if (!path) 287342e4b520STomohiro Misono return -ENOMEM; 287442e4b520STomohiro Misono 287542e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 287642e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 287742e4b520STomohiro Misono btrfs_free_path(path); 287842e4b520STomohiro Misono return PTR_ERR(rootrefs); 287942e4b520STomohiro Misono } 288042e4b520STomohiro Misono 288142e4b520STomohiro Misono inode = file_inode(file); 288242e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 288342e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 288442e4b520STomohiro Misono 288542e4b520STomohiro Misono key.objectid = objectid; 288642e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 288742e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 288842e4b520STomohiro Misono found = 0; 288942e4b520STomohiro Misono 289042e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 289142e4b520STomohiro Misono if (ret < 0) { 289242e4b520STomohiro Misono goto out; 289342e4b520STomohiro Misono } else if (path->slots[0] >= 289442e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 289542e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 289642e4b520STomohiro Misono if (ret < 0) { 289742e4b520STomohiro Misono goto out; 289842e4b520STomohiro Misono } else if (ret > 0) { 289942e4b520STomohiro Misono ret = -EUCLEAN; 290042e4b520STomohiro Misono goto out; 290142e4b520STomohiro Misono } 290242e4b520STomohiro Misono } 290342e4b520STomohiro Misono while (1) { 290442e4b520STomohiro Misono leaf = path->nodes[0]; 290542e4b520STomohiro Misono slot = path->slots[0]; 290642e4b520STomohiro Misono 290742e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 290842e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 290942e4b520STomohiro Misono ret = 0; 291042e4b520STomohiro Misono goto out; 291142e4b520STomohiro Misono } 291242e4b520STomohiro Misono 291342e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 291442e4b520STomohiro Misono ret = -EOVERFLOW; 291542e4b520STomohiro Misono goto out; 291642e4b520STomohiro Misono } 291742e4b520STomohiro Misono 291842e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 291942e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 292042e4b520STomohiro Misono rootrefs->rootref[found].dirid = 292142e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 292242e4b520STomohiro Misono found++; 292342e4b520STomohiro Misono 292442e4b520STomohiro Misono ret = btrfs_next_item(root, path); 292542e4b520STomohiro Misono if (ret < 0) { 292642e4b520STomohiro Misono goto out; 292742e4b520STomohiro Misono } else if (ret > 0) { 292842e4b520STomohiro Misono ret = -EUCLEAN; 292942e4b520STomohiro Misono goto out; 293042e4b520STomohiro Misono } 293142e4b520STomohiro Misono } 293242e4b520STomohiro Misono 293342e4b520STomohiro Misono out: 293442e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 293542e4b520STomohiro Misono rootrefs->num_items = found; 293642e4b520STomohiro Misono /* update min_treeid for next search */ 293742e4b520STomohiro Misono if (found) 293842e4b520STomohiro Misono rootrefs->min_treeid = 293942e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 294042e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 294142e4b520STomohiro Misono ret = -EFAULT; 294242e4b520STomohiro Misono } 294342e4b520STomohiro Misono 294442e4b520STomohiro Misono kfree(rootrefs); 294542e4b520STomohiro Misono btrfs_free_path(path); 294642e4b520STomohiro Misono 294742e4b520STomohiro Misono return ret; 294842e4b520STomohiro Misono } 294942e4b520STomohiro Misono 295076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2951949964c9SMarcos Paulo de Souza void __user *arg, 2952949964c9SMarcos Paulo de Souza bool destroy_v2) 295376dda93cSYan, Zheng { 295454563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 295676dda93cSYan, Zheng struct dentry *dentry; 29572b0143b5SDavid Howells struct inode *dir = d_inode(parent); 295876dda93cSYan, Zheng struct inode *inode; 295976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 296076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2961949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2962949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2963949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2964949964c9SMarcos Paulo de Souza int subvol_namelen; 296576dda93cSYan, Zheng int err = 0; 2966949964c9SMarcos Paulo de Souza bool destroy_parent = false; 296776dda93cSYan, Zheng 2968949964c9SMarcos Paulo de Souza if (destroy_v2) { 2969949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2970949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2971949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2972325c50e3SJeff Mahoney 2973949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2974949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2975949964c9SMarcos Paulo de Souza goto out; 2976949964c9SMarcos Paulo de Souza } 297776dda93cSYan, Zheng 2978949964c9SMarcos Paulo de Souza /* 2979949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2980949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2981949964c9SMarcos Paulo de Souza */ 2982949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2983949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2984949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2985949964c9SMarcos Paulo de Souza 2986949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2987949964c9SMarcos Paulo de Souza if (err) 2988949964c9SMarcos Paulo de Souza goto out; 2989949964c9SMarcos Paulo de Souza } else { 2990949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 299176dda93cSYan, Zheng err = -EINVAL; 299276dda93cSYan, Zheng goto out; 299376dda93cSYan, Zheng } 299476dda93cSYan, Zheng 2995a561be71SAl Viro err = mnt_want_write_file(file); 299676dda93cSYan, Zheng if (err) 299776dda93cSYan, Zheng goto out; 299876dda93cSYan, Zheng 2999949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 3000949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 3001949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 3002949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 3003949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 3004949964c9SMarcos Paulo de Souza goto out_drop_write; 3005949964c9SMarcos Paulo de Souza } 3006949964c9SMarcos Paulo de Souza 3007949964c9SMarcos Paulo de Souza /* 3008949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 3009949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 3010949964c9SMarcos Paulo de Souza */ 3011949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3012949964c9SMarcos Paulo de Souza 3013949964c9SMarcos Paulo de Souza /* 3014949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3015949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3016949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3017949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3018949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3019949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3020949964c9SMarcos Paulo de Souza */ 3021949964c9SMarcos Paulo de Souza dput(dentry); 3022949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3023949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3024949964c9SMarcos Paulo de Souza goto out_drop_write; 3025949964c9SMarcos Paulo de Souza } 3026949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3027949964c9SMarcos Paulo de Souza 3028949964c9SMarcos Paulo de Souza /* 3029949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3030949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3031949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3032949964c9SMarcos Paulo de Souza * new parent dentry. 3033949964c9SMarcos Paulo de Souza */ 3034949964c9SMarcos Paulo de Souza destroy_parent = true; 3035949964c9SMarcos Paulo de Souza 3036949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3037949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3038949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3039949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3040949964c9SMarcos Paulo de Souza goto free_parent; 3041949964c9SMarcos Paulo de Souza } 3042949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 3043949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3044949964c9SMarcos Paulo de Souza } 3045949964c9SMarcos Paulo de Souza } else { 3046949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3047949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3048949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3049949964c9SMarcos Paulo de Souza 3050949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3051949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3052949964c9SMarcos Paulo de Souza 3053949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3054949964c9SMarcos Paulo de Souza if (err) 3055949964c9SMarcos Paulo de Souza goto out; 3056949964c9SMarcos Paulo de Souza } 3057949964c9SMarcos Paulo de Souza 3058949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3059949964c9SMarcos Paulo de Souza 3060949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3061949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3062949964c9SMarcos Paulo de Souza err = -EINVAL; 3063949964c9SMarcos Paulo de Souza goto free_subvol_name; 3064949964c9SMarcos Paulo de Souza } 3065949964c9SMarcos Paulo de Souza 3066949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3067949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3068949964c9SMarcos Paulo de Souza goto free_subvol_name; 3069949964c9SMarcos Paulo de Souza } 3070521e0546SDavid Sterba 307100235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 307200235411SAl Viro if (err == -EINTR) 3073949964c9SMarcos Paulo de Souza goto free_subvol_name; 3074949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 307576dda93cSYan, Zheng if (IS_ERR(dentry)) { 307676dda93cSYan, Zheng err = PTR_ERR(dentry); 307776dda93cSYan, Zheng goto out_unlock_dir; 307876dda93cSYan, Zheng } 307976dda93cSYan, Zheng 30802b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 308176dda93cSYan, Zheng err = -ENOENT; 308276dda93cSYan, Zheng goto out_dput; 308376dda93cSYan, Zheng } 308476dda93cSYan, Zheng 30852b0143b5SDavid Howells inode = d_inode(dentry); 30864260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30874260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30884260f7c7SSage Weil /* 30894260f7c7SSage Weil * Regular user. Only allow this with a special mount 30904260f7c7SSage Weil * option, when the user has write+exec access to the 30914260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30924260f7c7SSage Weil * allowed. 30934260f7c7SSage Weil * 30944260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30954260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30964260f7c7SSage Weil * otherwise be able to delete. 30974260f7c7SSage Weil * 30984260f7c7SSage Weil * Users who want to delete empty subvols should try 30994260f7c7SSage Weil * rmdir(2). 31004260f7c7SSage Weil */ 31014260f7c7SSage Weil err = -EPERM; 31020b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 31034260f7c7SSage Weil goto out_dput; 31044260f7c7SSage Weil 31054260f7c7SSage Weil /* 31064260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 31074260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 31084260f7c7SSage Weil * must be called on the dentry referencing the root 31094260f7c7SSage Weil * of the subvol, not a random directory contained 31104260f7c7SSage Weil * within it. 31114260f7c7SSage Weil */ 31124260f7c7SSage Weil err = -EINVAL; 31134260f7c7SSage Weil if (root == dest) 31144260f7c7SSage Weil goto out_dput; 31154260f7c7SSage Weil 311647291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, 311747291baaSChristian Brauner MAY_WRITE | MAY_EXEC); 31184260f7c7SSage Weil if (err) 31194260f7c7SSage Weil goto out_dput; 31205c39da5bSMiao Xie } 31214260f7c7SSage Weil 31225c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 31234260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 31244260f7c7SSage Weil if (err) 31254260f7c7SSage Weil goto out_dput; 31264260f7c7SSage Weil 31274a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 312876dda93cSYan, Zheng err = -EINVAL; 312976dda93cSYan, Zheng goto out_dput; 313076dda93cSYan, Zheng } 313176dda93cSYan, Zheng 313264708539SJosef Bacik btrfs_inode_lock(inode, 0); 3133f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 313464708539SJosef Bacik btrfs_inode_unlock(inode, 0); 313546008d9dSAmir Goldstein if (!err) { 313646008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 313776dda93cSYan, Zheng d_delete(dentry); 313846008d9dSAmir Goldstein } 3139fa6ac876SLiu Bo 314076dda93cSYan, Zheng out_dput: 314176dda93cSYan, Zheng dput(dentry); 314276dda93cSYan, Zheng out_unlock_dir: 314364708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3144949964c9SMarcos Paulo de Souza free_subvol_name: 3145949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3146949964c9SMarcos Paulo de Souza free_parent: 3147949964c9SMarcos Paulo de Souza if (destroy_parent) 3148949964c9SMarcos Paulo de Souza dput(parent); 314900235411SAl Viro out_drop_write: 31502a79f17eSAl Viro mnt_drop_write_file(file); 315176dda93cSYan, Zheng out: 3152949964c9SMarcos Paulo de Souza kfree(vol_args2); 315376dda93cSYan, Zheng kfree(vol_args); 315476dda93cSYan, Zheng return err; 315576dda93cSYan, Zheng } 315676dda93cSYan, Zheng 31571e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3158f46b5a66SChristoph Hellwig { 3159496ad9aaSAl Viro struct inode *inode = file_inode(file); 3160f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31611e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3162c146afadSYan Zheng int ret; 3163c146afadSYan Zheng 316425122d15SIlya Dryomov ret = mnt_want_write_file(file); 316525122d15SIlya Dryomov if (ret) 316625122d15SIlya Dryomov return ret; 3167b83cc969SLi Zefan 316825122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 316925122d15SIlya Dryomov ret = -EROFS; 317025122d15SIlya Dryomov goto out; 31715ac00addSStefan Behrens } 3172f46b5a66SChristoph Hellwig 3173f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3174f46b5a66SChristoph Hellwig case S_IFDIR: 3175e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3176e441d54dSChris Mason ret = -EPERM; 3177e441d54dSChris Mason goto out; 3178e441d54dSChris Mason } 3179de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3180f46b5a66SChristoph Hellwig break; 3181f46b5a66SChristoph Hellwig case S_IFREG: 3182616d374eSAdam Borowski /* 3183616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3184616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3185616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3186616d374eSAdam Borowski */ 3187616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 318847291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3189616d374eSAdam Borowski ret = -EPERM; 3190e441d54dSChris Mason goto out; 3191e441d54dSChris Mason } 31921e701a32SChris Mason 31931e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31941e701a32SChris Mason if (!range) { 31951e701a32SChris Mason ret = -ENOMEM; 31961e701a32SChris Mason goto out; 31971e701a32SChris Mason } 31981e701a32SChris Mason 31991e701a32SChris Mason if (argp) { 32001e701a32SChris Mason if (copy_from_user(range, argp, 32011e701a32SChris Mason sizeof(*range))) { 32021e701a32SChris Mason ret = -EFAULT; 32031e701a32SChris Mason kfree(range); 3204683be16eSDan Carpenter goto out; 32051e701a32SChris Mason } 32061e701a32SChris Mason /* compression requires us to start the IO */ 32071e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 32081e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 32091e701a32SChris Mason range->extent_thresh = (u32)-1; 32101e701a32SChris Mason } 32111e701a32SChris Mason } else { 32121e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 32131e701a32SChris Mason range->len = (u64)-1; 32141e701a32SChris Mason } 3215496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 32167c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 32174cb5300bSChris Mason if (ret > 0) 32184cb5300bSChris Mason ret = 0; 32191e701a32SChris Mason kfree(range); 3220f46b5a66SChristoph Hellwig break; 32218929ecfaSYan, Zheng default: 32228929ecfaSYan, Zheng ret = -EINVAL; 3223f46b5a66SChristoph Hellwig } 3224e441d54dSChris Mason out: 322525122d15SIlya Dryomov mnt_drop_write_file(file); 3226e441d54dSChris Mason return ret; 3227f46b5a66SChristoph Hellwig } 3228f46b5a66SChristoph Hellwig 32292ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3230f46b5a66SChristoph Hellwig { 3231f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3232f46b5a66SChristoph Hellwig int ret; 3233f46b5a66SChristoph Hellwig 3234e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3235e441d54dSChris Mason return -EPERM; 3236e441d54dSChris Mason 3237c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3238e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3239c9e9f97bSIlya Dryomov 3240dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3241c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3242c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3243c9e9f97bSIlya Dryomov goto out; 3244c9e9f97bSIlya Dryomov } 3245f46b5a66SChristoph Hellwig 32465516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32472ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3248f46b5a66SChristoph Hellwig 324943d20761SAnand Jain if (!ret) 32500b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 325143d20761SAnand Jain 3252f46b5a66SChristoph Hellwig kfree(vol_args); 3253c9e9f97bSIlya Dryomov out: 3254c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3255f46b5a66SChristoph Hellwig return ret; 3256f46b5a66SChristoph Hellwig } 3257f46b5a66SChristoph Hellwig 32586b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3259f46b5a66SChristoph Hellwig { 32600b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32610b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32626b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3263f46b5a66SChristoph Hellwig int ret; 3264f46b5a66SChristoph Hellwig 3265e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3266e441d54dSChris Mason return -EPERM; 3267e441d54dSChris Mason 3268da24927bSMiao Xie ret = mnt_want_write_file(file); 3269da24927bSMiao Xie if (ret) 3270da24927bSMiao Xie return ret; 3271c146afadSYan Zheng 3272dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3273c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3274c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3275c47ca32dSDan Carpenter goto err_drop; 3276c9e9f97bSIlya Dryomov } 3277f46b5a66SChristoph Hellwig 3278748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3279fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3280fd4e994bSOmar Sandoval goto out; 3281fd4e994bSOmar Sandoval } 3282f46b5a66SChristoph Hellwig 3283c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3284183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3285183860f6SAnand Jain goto out; 3286183860f6SAnand Jain } 3287183860f6SAnand Jain 3288735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 32892ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 32906b526ed7SAnand Jain } else { 32916b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 32922ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 32936b526ed7SAnand Jain } 3294c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3295183860f6SAnand Jain 32966b526ed7SAnand Jain if (!ret) { 3297735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32980b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32996b526ed7SAnand Jain vol_args->devid); 33006b526ed7SAnand Jain else 33010b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 33026b526ed7SAnand Jain vol_args->name); 33036b526ed7SAnand Jain } 3304183860f6SAnand Jain out: 3305183860f6SAnand Jain kfree(vol_args); 3306c47ca32dSDan Carpenter err_drop: 33074ac20c70SIlya Dryomov mnt_drop_write_file(file); 3308f46b5a66SChristoph Hellwig return ret; 3309f46b5a66SChristoph Hellwig } 3310f46b5a66SChristoph Hellwig 3311f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3312f46b5a66SChristoph Hellwig { 33130b246afaSJeff Mahoney struct inode *inode = file_inode(file); 33140b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3315f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3316f46b5a66SChristoph Hellwig int ret; 3317f46b5a66SChristoph Hellwig 3318f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3319f46b5a66SChristoph Hellwig return -EPERM; 3320f46b5a66SChristoph Hellwig 3321f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3322f46b5a66SChristoph Hellwig if (ret) 3323f46b5a66SChristoph Hellwig return ret; 3324f46b5a66SChristoph Hellwig 3325c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3326f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 332758d7bbf8SDavid Sterba goto out_drop_write; 332858d7bbf8SDavid Sterba } 332958d7bbf8SDavid Sterba 333058d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 333158d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 333258d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3333f46b5a66SChristoph Hellwig goto out; 3334f46b5a66SChristoph Hellwig } 3335f46b5a66SChristoph Hellwig 333658d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 33372ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3338f46b5a66SChristoph Hellwig 3339f46b5a66SChristoph Hellwig if (!ret) 33400b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3341f46b5a66SChristoph Hellwig kfree(vol_args); 334258d7bbf8SDavid Sterba out: 3343c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 334458d7bbf8SDavid Sterba out_drop_write: 3345f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 334658d7bbf8SDavid Sterba 3347f46b5a66SChristoph Hellwig return ret; 3348f46b5a66SChristoph Hellwig } 3349f46b5a66SChristoph Hellwig 33502ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33512ff7e61eSJeff Mahoney void __user *arg) 3352475f6387SJan Schmidt { 3353027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3354475f6387SJan Schmidt struct btrfs_device *device; 33550b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3356137c5418SJohannes Thumshirn u64 flags_in; 3357027ed2f0SLi Zefan int ret = 0; 3358475f6387SJan Schmidt 3359137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3360137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3361137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3362137c5418SJohannes Thumshirn 3363137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3364137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3365027ed2f0SLi Zefan 3366d03262c7SDavid Sterba rcu_read_lock(); 3367027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3368475f6387SJan Schmidt 3369d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3370027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3371027ed2f0SLi Zefan fi_args->max_id = device->devid; 3372475f6387SJan Schmidt } 3373d03262c7SDavid Sterba rcu_read_unlock(); 3374475f6387SJan Schmidt 3375de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3376bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3377bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3378bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 337980a773fbSDavid Sterba 3380137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3381137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3382137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3383137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3384137c5418SJohannes Thumshirn } 3385137c5418SJohannes Thumshirn 33860fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33870fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33880fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33890fb408a5SJohannes Thumshirn } 33900fb408a5SJohannes Thumshirn 339149bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 339249bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 339349bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 339449bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 339549bac897SJohannes Thumshirn } 339649bac897SJohannes Thumshirn 3397027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3398027ed2f0SLi Zefan ret = -EFAULT; 3399475f6387SJan Schmidt 3400027ed2f0SLi Zefan kfree(fi_args); 3401027ed2f0SLi Zefan return ret; 3402475f6387SJan Schmidt } 3403475f6387SJan Schmidt 34042ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 34052ff7e61eSJeff Mahoney void __user *arg) 3406475f6387SJan Schmidt { 3407475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3408475f6387SJan Schmidt struct btrfs_device *dev; 3409475f6387SJan Schmidt int ret = 0; 3410475f6387SJan Schmidt char *s_uuid = NULL; 3411475f6387SJan Schmidt 3412475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3413475f6387SJan Schmidt if (IS_ERR(di_args)) 3414475f6387SJan Schmidt return PTR_ERR(di_args); 3415475f6387SJan Schmidt 3416dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3417475f6387SJan Schmidt s_uuid = di_args->uuid; 3418475f6387SJan Schmidt 3419c5593ca3SDavid Sterba rcu_read_lock(); 3420e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3421b2598edfSAnand Jain NULL); 3422475f6387SJan Schmidt 3423475f6387SJan Schmidt if (!dev) { 3424475f6387SJan Schmidt ret = -ENODEV; 3425475f6387SJan Schmidt goto out; 3426475f6387SJan Schmidt } 3427475f6387SJan Schmidt 3428475f6387SJan Schmidt di_args->devid = dev->devid; 34297cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 34307cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3431475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3432a27202fbSJim Meyering if (dev->name) { 3433672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3434672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3435a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3436a27202fbSJim Meyering } else { 343799ba55adSStefan Behrens di_args->path[0] = '\0'; 3438a27202fbSJim Meyering } 3439475f6387SJan Schmidt 3440475f6387SJan Schmidt out: 3441c5593ca3SDavid Sterba rcu_read_unlock(); 3442475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3443475f6387SJan Schmidt ret = -EFAULT; 3444475f6387SJan Schmidt 3445475f6387SJan Schmidt kfree(di_args); 3446475f6387SJan Schmidt return ret; 3447475f6387SJan Schmidt } 3448475f6387SJan Schmidt 34496ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34506ef5ed0dSJosef Bacik { 3451496ad9aaSAl Viro struct inode *inode = file_inode(file); 34520b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34536ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34546ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34556ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34566ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34572a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34586ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34596ef5ed0dSJosef Bacik u64 objectid = 0; 34606ef5ed0dSJosef Bacik u64 dir_id; 34613c04ce01SMiao Xie int ret; 34626ef5ed0dSJosef Bacik 34636ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34646ef5ed0dSJosef Bacik return -EPERM; 34656ef5ed0dSJosef Bacik 34663c04ce01SMiao Xie ret = mnt_want_write_file(file); 34673c04ce01SMiao Xie if (ret) 34683c04ce01SMiao Xie return ret; 34693c04ce01SMiao Xie 34703c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34713c04ce01SMiao Xie ret = -EFAULT; 34723c04ce01SMiao Xie goto out; 34733c04ce01SMiao Xie } 34746ef5ed0dSJosef Bacik 34756ef5ed0dSJosef Bacik if (!objectid) 34761cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34776ef5ed0dSJosef Bacik 347856e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34793c04ce01SMiao Xie if (IS_ERR(new_root)) { 34803c04ce01SMiao Xie ret = PTR_ERR(new_root); 34813c04ce01SMiao Xie goto out; 34823c04ce01SMiao Xie } 34832a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34842a2b5d62SJosef Bacik ret = -ENOENT; 34852a2b5d62SJosef Bacik goto out_free; 34862a2b5d62SJosef Bacik } 34876ef5ed0dSJosef Bacik 34886ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34893c04ce01SMiao Xie if (!path) { 34903c04ce01SMiao Xie ret = -ENOMEM; 34912a2b5d62SJosef Bacik goto out_free; 34923c04ce01SMiao Xie } 34936ef5ed0dSJosef Bacik 34946ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 349598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34963c04ce01SMiao Xie ret = PTR_ERR(trans); 34972a2b5d62SJosef Bacik goto out_free; 34986ef5ed0dSJosef Bacik } 34996ef5ed0dSJosef Bacik 35000b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 35010b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 35026ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3503cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 35042a2b5d62SJosef Bacik btrfs_release_path(path); 35053a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35060b246afaSJeff Mahoney btrfs_err(fs_info, 35075d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 35083c04ce01SMiao Xie ret = -ENOENT; 35092a2b5d62SJosef Bacik goto out_free; 35106ef5ed0dSJosef Bacik } 35116ef5ed0dSJosef Bacik 35126ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 35136ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 35146ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 35152a2b5d62SJosef Bacik btrfs_release_path(path); 35166ef5ed0dSJosef Bacik 35170b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 35183a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35192a2b5d62SJosef Bacik out_free: 352000246528SJosef Bacik btrfs_put_root(new_root); 35212a2b5d62SJosef Bacik btrfs_free_path(path); 35223c04ce01SMiao Xie out: 35233c04ce01SMiao Xie mnt_drop_write_file(file); 35243c04ce01SMiao Xie return ret; 35256ef5ed0dSJosef Bacik } 35266ef5ed0dSJosef Bacik 3527c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3528bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3529bf5fc093SJosef Bacik { 353032da5386SDavid Sterba struct btrfs_block_group *block_group; 3531bf5fc093SJosef Bacik 3532bf5fc093SJosef Bacik space->total_bytes = 0; 3533bf5fc093SJosef Bacik space->used_bytes = 0; 3534bf5fc093SJosef Bacik space->flags = 0; 3535bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3536bf5fc093SJosef Bacik space->flags = block_group->flags; 3537b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3538bf38be65SDavid Sterba space->used_bytes += block_group->used; 3539bf5fc093SJosef Bacik } 3540bf5fc093SJosef Bacik } 3541bf5fc093SJosef Bacik 35422ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 35432ff7e61eSJeff Mahoney void __user *arg) 35441406e432SJosef Bacik { 35451406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35461406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35471406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35487fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 354913f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35501406e432SJosef Bacik struct btrfs_space_info *info; 3551315d8e98SColin Ian King static const u64 types[] = { 3552315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3553bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3554bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3555315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3556315d8e98SColin Ian King }; 3557bf5fc093SJosef Bacik int num_types = 4; 35587fde62bfSChris Mason int alloc_size; 35591406e432SJosef Bacik int ret = 0; 356051788b1bSDan Rosenberg u64 slot_count = 0; 3561bf5fc093SJosef Bacik int i, c; 35621406e432SJosef Bacik 35631406e432SJosef Bacik if (copy_from_user(&space_args, 35641406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35651406e432SJosef Bacik sizeof(space_args))) 35661406e432SJosef Bacik return -EFAULT; 35671406e432SJosef Bacik 3568bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3569bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3570bf5fc093SJosef Bacik 3571bf5fc093SJosef Bacik info = NULL; 357272804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3573bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3574bf5fc093SJosef Bacik info = tmp; 3575bf5fc093SJosef Bacik break; 3576bf5fc093SJosef Bacik } 3577bf5fc093SJosef Bacik } 35781406e432SJosef Bacik 3579bf5fc093SJosef Bacik if (!info) 3580bf5fc093SJosef Bacik continue; 3581bf5fc093SJosef Bacik 3582bf5fc093SJosef Bacik down_read(&info->groups_sem); 3583bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3584bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3585bf5fc093SJosef Bacik slot_count++; 3586bf5fc093SJosef Bacik } 3587bf5fc093SJosef Bacik up_read(&info->groups_sem); 3588bf5fc093SJosef Bacik } 3589bf5fc093SJosef Bacik 359036523e95SDavid Sterba /* 359136523e95SDavid Sterba * Global block reserve, exported as a space_info 359236523e95SDavid Sterba */ 359336523e95SDavid Sterba slot_count++; 359436523e95SDavid Sterba 35957fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35967fde62bfSChris Mason if (space_args.space_slots == 0) { 35977fde62bfSChris Mason space_args.total_spaces = slot_count; 35987fde62bfSChris Mason goto out; 35997fde62bfSChris Mason } 3600bf5fc093SJosef Bacik 360151788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3602bf5fc093SJosef Bacik 36037fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3604bf5fc093SJosef Bacik 36057fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 36067fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 36077fde62bfSChris Mason */ 360809cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 36097fde62bfSChris Mason return -ENOMEM; 36107fde62bfSChris Mason 36117fde62bfSChris Mason space_args.total_spaces = 0; 36128d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 36137fde62bfSChris Mason if (!dest) 36147fde62bfSChris Mason return -ENOMEM; 36157fde62bfSChris Mason dest_orig = dest; 36167fde62bfSChris Mason 36177fde62bfSChris Mason /* now we have a buffer to copy into */ 3618bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3619bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3620bf5fc093SJosef Bacik 362151788b1bSDan Rosenberg if (!slot_count) 362251788b1bSDan Rosenberg break; 362351788b1bSDan Rosenberg 3624bf5fc093SJosef Bacik info = NULL; 362572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3626bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3627bf5fc093SJosef Bacik info = tmp; 36287fde62bfSChris Mason break; 3629bf5fc093SJosef Bacik } 3630bf5fc093SJosef Bacik } 36317fde62bfSChris Mason 3632bf5fc093SJosef Bacik if (!info) 3633bf5fc093SJosef Bacik continue; 3634bf5fc093SJosef Bacik down_read(&info->groups_sem); 3635bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3636bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3637c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3638c065f5b1SSu Yue &space); 36397fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36401406e432SJosef Bacik dest++; 36411406e432SJosef Bacik space_args.total_spaces++; 364251788b1bSDan Rosenberg slot_count--; 36431406e432SJosef Bacik } 364451788b1bSDan Rosenberg if (!slot_count) 364551788b1bSDan Rosenberg break; 3646bf5fc093SJosef Bacik } 3647bf5fc093SJosef Bacik up_read(&info->groups_sem); 3648bf5fc093SJosef Bacik } 36491406e432SJosef Bacik 365036523e95SDavid Sterba /* 365136523e95SDavid Sterba * Add global block reserve 365236523e95SDavid Sterba */ 365336523e95SDavid Sterba if (slot_count) { 36540b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 365536523e95SDavid Sterba 365636523e95SDavid Sterba spin_lock(&block_rsv->lock); 365736523e95SDavid Sterba space.total_bytes = block_rsv->size; 365836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 365936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 366036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 366136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 366236523e95SDavid Sterba space_args.total_spaces++; 366336523e95SDavid Sterba } 366436523e95SDavid Sterba 36652eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36667fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36677fde62bfSChris Mason 36687fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36697fde62bfSChris Mason ret = -EFAULT; 36707fde62bfSChris Mason 36717fde62bfSChris Mason kfree(dest_orig); 36727fde62bfSChris Mason out: 36737fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36741406e432SJosef Bacik ret = -EFAULT; 36751406e432SJosef Bacik 36761406e432SJosef Bacik return ret; 36771406e432SJosef Bacik } 36781406e432SJosef Bacik 36799a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36809a8c28beSMiao Xie void __user *argp) 368146204592SSage Weil { 368246204592SSage Weil struct btrfs_trans_handle *trans; 368346204592SSage Weil u64 transid; 3684db5b493aSTsutomu Itoh int ret; 368546204592SSage Weil 3686d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3687ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3688ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 368998d5dc13STsutomu Itoh return PTR_ERR(trans); 3690ff7c1d33SMiao Xie 3691ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3692ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3693ff7c1d33SMiao Xie goto out; 3694ff7c1d33SMiao Xie } 369546204592SSage Weil transid = trans->transid; 36963a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36978b2b2d3cSTsutomu Itoh if (ret) { 36983a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3699db5b493aSTsutomu Itoh return ret; 37008b2b2d3cSTsutomu Itoh } 3701ff7c1d33SMiao Xie out: 370246204592SSage Weil if (argp) 370346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 370446204592SSage Weil return -EFAULT; 370546204592SSage Weil return 0; 370646204592SSage Weil } 370746204592SSage Weil 37082ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 37099a8c28beSMiao Xie void __user *argp) 371046204592SSage Weil { 371146204592SSage Weil u64 transid; 371246204592SSage Weil 371346204592SSage Weil if (argp) { 371446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 371546204592SSage Weil return -EFAULT; 371646204592SSage Weil } else { 371746204592SSage Weil transid = 0; /* current trans */ 371846204592SSage Weil } 37192ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 372046204592SSage Weil } 372146204592SSage Weil 3722b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3723475f6387SJan Schmidt { 37240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3725475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3726b8e95489SMiao Xie int ret; 3727475f6387SJan Schmidt 3728475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3729475f6387SJan Schmidt return -EPERM; 3730475f6387SJan Schmidt 3731475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3732475f6387SJan Schmidt if (IS_ERR(sa)) 3733475f6387SJan Schmidt return PTR_ERR(sa); 3734475f6387SJan Schmidt 3735b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3736b8e95489SMiao Xie ret = mnt_want_write_file(file); 3737b8e95489SMiao Xie if (ret) 3738b8e95489SMiao Xie goto out; 3739b8e95489SMiao Xie } 3740b8e95489SMiao Xie 37410b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 374263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 374363a212abSStefan Behrens 0); 3744475f6387SJan Schmidt 37455afe6ce7SFilipe Manana /* 37465afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37475afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37485afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37495afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37505afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37515afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37525afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37535afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37545afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37555afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37565afe6ce7SFilipe Manana */ 37575afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3758475f6387SJan Schmidt ret = -EFAULT; 3759475f6387SJan Schmidt 3760b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3761b8e95489SMiao Xie mnt_drop_write_file(file); 3762b8e95489SMiao Xie out: 3763475f6387SJan Schmidt kfree(sa); 3764475f6387SJan Schmidt return ret; 3765475f6387SJan Schmidt } 3766475f6387SJan Schmidt 37672ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3768475f6387SJan Schmidt { 3769475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3770475f6387SJan Schmidt return -EPERM; 3771475f6387SJan Schmidt 37722ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3773475f6387SJan Schmidt } 3774475f6387SJan Schmidt 37752ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3776475f6387SJan Schmidt void __user *arg) 3777475f6387SJan Schmidt { 3778475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3779475f6387SJan Schmidt int ret; 3780475f6387SJan Schmidt 3781475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3782475f6387SJan Schmidt return -EPERM; 3783475f6387SJan Schmidt 3784475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3785475f6387SJan Schmidt if (IS_ERR(sa)) 3786475f6387SJan Schmidt return PTR_ERR(sa); 3787475f6387SJan Schmidt 37882ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3789475f6387SJan Schmidt 37904fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3791475f6387SJan Schmidt ret = -EFAULT; 3792475f6387SJan Schmidt 3793475f6387SJan Schmidt kfree(sa); 3794475f6387SJan Schmidt return ret; 3795475f6387SJan Schmidt } 3796475f6387SJan Schmidt 37972ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3798b27f7c0cSDavid Sterba void __user *arg) 3799c11d2c23SStefan Behrens { 3800c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3801c11d2c23SStefan Behrens int ret; 3802c11d2c23SStefan Behrens 3803c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3804c11d2c23SStefan Behrens if (IS_ERR(sa)) 3805c11d2c23SStefan Behrens return PTR_ERR(sa); 3806c11d2c23SStefan Behrens 3807b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3808b27f7c0cSDavid Sterba kfree(sa); 3809b27f7c0cSDavid Sterba return -EPERM; 3810b27f7c0cSDavid Sterba } 3811b27f7c0cSDavid Sterba 38122ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3813c11d2c23SStefan Behrens 3814eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3815c11d2c23SStefan Behrens ret = -EFAULT; 3816c11d2c23SStefan Behrens 3817c11d2c23SStefan Behrens kfree(sa); 3818c11d2c23SStefan Behrens return ret; 3819c11d2c23SStefan Behrens } 3820c11d2c23SStefan Behrens 38212ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 38222ff7e61eSJeff Mahoney void __user *arg) 38233f6bcfbdSStefan Behrens { 38243f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 38253f6bcfbdSStefan Behrens int ret; 38263f6bcfbdSStefan Behrens 38273f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 38283f6bcfbdSStefan Behrens return -EPERM; 38293f6bcfbdSStefan Behrens 38303f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38313f6bcfbdSStefan Behrens if (IS_ERR(p)) 38323f6bcfbdSStefan Behrens return PTR_ERR(p); 38333f6bcfbdSStefan Behrens 38343f6bcfbdSStefan Behrens switch (p->cmd) { 38353f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3836bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3837adfa97cbSIlya Dryomov ret = -EROFS; 3838adfa97cbSIlya Dryomov goto out; 3839adfa97cbSIlya Dryomov } 3840c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3841e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38423f6bcfbdSStefan Behrens } else { 38432ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3844c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38453f6bcfbdSStefan Behrens } 38463f6bcfbdSStefan Behrens break; 38473f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38480b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38493f6bcfbdSStefan Behrens ret = 0; 38503f6bcfbdSStefan Behrens break; 38513f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 385217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 385397282031SAnand Jain ret = 0; 38543f6bcfbdSStefan Behrens break; 38553f6bcfbdSStefan Behrens default: 38563f6bcfbdSStefan Behrens ret = -EINVAL; 38573f6bcfbdSStefan Behrens break; 38583f6bcfbdSStefan Behrens } 38593f6bcfbdSStefan Behrens 3860d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38613f6bcfbdSStefan Behrens ret = -EFAULT; 3862adfa97cbSIlya Dryomov out: 38633f6bcfbdSStefan Behrens kfree(p); 38643f6bcfbdSStefan Behrens return ret; 38653f6bcfbdSStefan Behrens } 38663f6bcfbdSStefan Behrens 3867d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3868d7728c96SJan Schmidt { 3869d7728c96SJan Schmidt int ret = 0; 3870d7728c96SJan Schmidt int i; 3871740c3d22SChris Mason u64 rel_ptr; 3872d7728c96SJan Schmidt int size; 3873806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3874d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3875d7728c96SJan Schmidt struct btrfs_path *path; 3876d7728c96SJan Schmidt 387782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3878d7728c96SJan Schmidt return -EPERM; 3879d7728c96SJan Schmidt 3880d7728c96SJan Schmidt path = btrfs_alloc_path(); 3881d7728c96SJan Schmidt if (!path) { 3882d7728c96SJan Schmidt ret = -ENOMEM; 3883d7728c96SJan Schmidt goto out; 3884d7728c96SJan Schmidt } 3885d7728c96SJan Schmidt 3886d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3887d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3888d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3889d7728c96SJan Schmidt ipa = NULL; 3890d7728c96SJan Schmidt goto out; 3891d7728c96SJan Schmidt } 3892d7728c96SJan Schmidt 3893d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3894d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3895d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3896d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3897d7728c96SJan Schmidt ipath = NULL; 3898d7728c96SJan Schmidt goto out; 3899d7728c96SJan Schmidt } 3900d7728c96SJan Schmidt 3901d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3902d7728c96SJan Schmidt if (ret < 0) 3903d7728c96SJan Schmidt goto out; 3904d7728c96SJan Schmidt 3905d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3906745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3907745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3908740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3909d7728c96SJan Schmidt } 3910d7728c96SJan Schmidt 3911718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3912718dc5faSOmar Sandoval ipath->fspath, size); 3913d7728c96SJan Schmidt if (ret) { 3914d7728c96SJan Schmidt ret = -EFAULT; 3915d7728c96SJan Schmidt goto out; 3916d7728c96SJan Schmidt } 3917d7728c96SJan Schmidt 3918d7728c96SJan Schmidt out: 3919d7728c96SJan Schmidt btrfs_free_path(path); 3920d7728c96SJan Schmidt free_ipath(ipath); 3921d7728c96SJan Schmidt kfree(ipa); 3922d7728c96SJan Schmidt 3923d7728c96SJan Schmidt return ret; 3924d7728c96SJan Schmidt } 3925d7728c96SJan Schmidt 3926d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3927d7728c96SJan Schmidt { 3928d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3929d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3930d7728c96SJan Schmidt 3931d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3932d7728c96SJan Schmidt inodes->bytes_left -= c; 3933d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3934d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3935d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3936d7728c96SJan Schmidt inodes->elem_cnt += 3; 3937d7728c96SJan Schmidt } else { 3938d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3939d7728c96SJan Schmidt inodes->bytes_left = 0; 3940d7728c96SJan Schmidt inodes->elem_missed += 3; 3941d7728c96SJan Schmidt } 3942d7728c96SJan Schmidt 3943d7728c96SJan Schmidt return 0; 3944d7728c96SJan Schmidt } 3945d7728c96SJan Schmidt 39462ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3947d24a67b2SZygo Blaxell void __user *arg, int version) 3948d7728c96SJan Schmidt { 3949d7728c96SJan Schmidt int ret = 0; 3950d7728c96SJan Schmidt int size; 3951d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3952d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3953d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3954d24a67b2SZygo Blaxell bool ignore_offset; 3955d7728c96SJan Schmidt 3956d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3957d7728c96SJan Schmidt return -EPERM; 3958d7728c96SJan Schmidt 3959d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39607b9ea627SShailendra Verma if (IS_ERR(loi)) 39617b9ea627SShailendra Verma return PTR_ERR(loi); 3962d7728c96SJan Schmidt 3963d24a67b2SZygo Blaxell if (version == 1) { 3964d24a67b2SZygo Blaxell ignore_offset = false; 3965b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3966d24a67b2SZygo Blaxell } else { 3967d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3968d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3969d24a67b2SZygo Blaxell ret = -EINVAL; 3970d24a67b2SZygo Blaxell goto out_loi; 3971d24a67b2SZygo Blaxell } 3972d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3973d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3974d24a67b2SZygo Blaxell ret = -EINVAL; 3975d24a67b2SZygo Blaxell goto out_loi; 3976d24a67b2SZygo Blaxell } 3977d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3978b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3979d24a67b2SZygo Blaxell } 3980d24a67b2SZygo Blaxell 3981d7728c96SJan Schmidt path = btrfs_alloc_path(); 3982d7728c96SJan Schmidt if (!path) { 3983d7728c96SJan Schmidt ret = -ENOMEM; 3984d7728c96SJan Schmidt goto out; 3985d7728c96SJan Schmidt } 3986d7728c96SJan Schmidt 3987d7728c96SJan Schmidt inodes = init_data_container(size); 3988d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3989d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3990d7728c96SJan Schmidt inodes = NULL; 3991d7728c96SJan Schmidt goto out; 3992d7728c96SJan Schmidt } 3993d7728c96SJan Schmidt 39942ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3995d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3996df031f07SLiu Bo if (ret == -EINVAL) 3997d7728c96SJan Schmidt ret = -ENOENT; 3998d7728c96SJan Schmidt if (ret < 0) 3999d7728c96SJan Schmidt goto out; 4000d7728c96SJan Schmidt 4001718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 4002718dc5faSOmar Sandoval size); 4003d7728c96SJan Schmidt if (ret) 4004d7728c96SJan Schmidt ret = -EFAULT; 4005d7728c96SJan Schmidt 4006d7728c96SJan Schmidt out: 4007d7728c96SJan Schmidt btrfs_free_path(path); 4008f54de068SDavid Sterba kvfree(inodes); 4009d24a67b2SZygo Blaxell out_loi: 4010d7728c96SJan Schmidt kfree(loi); 4011d7728c96SJan Schmidt 4012d7728c96SJan Schmidt return ret; 4013d7728c96SJan Schmidt } 4014d7728c96SJan Schmidt 4015008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4016c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4017c9e9f97bSIlya Dryomov { 4018c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4019c9e9f97bSIlya Dryomov 4020c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4021c9e9f97bSIlya Dryomov 40223009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4023837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4024837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4025837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4026a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4027a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4028837d5b6eSIlya Dryomov 4029c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4030c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4031c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 403219a39dceSIlya Dryomov 403319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 403419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 403519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4036c9e9f97bSIlya Dryomov } 4037c9e9f97bSIlya Dryomov 40389ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4039c9e9f97bSIlya Dryomov { 4040496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4041c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4042c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4043c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4044ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4045c9e9f97bSIlya Dryomov int ret; 4046c9e9f97bSIlya Dryomov 4047c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4048c9e9f97bSIlya Dryomov return -EPERM; 4049c9e9f97bSIlya Dryomov 4050e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40519ba1f6e4SLiu Bo if (ret) 40529ba1f6e4SLiu Bo return ret; 40539ba1f6e4SLiu Bo 4054ed0fb78fSIlya Dryomov again: 4055c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4056c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4057ed0fb78fSIlya Dryomov need_unlock = true; 4058ed0fb78fSIlya Dryomov goto locked; 4059ed0fb78fSIlya Dryomov } 4060ed0fb78fSIlya Dryomov 4061ed0fb78fSIlya Dryomov /* 406201327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4063ed0fb78fSIlya Dryomov * (1) some other op is running 4064ed0fb78fSIlya Dryomov * (2) balance is running 4065ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4066ed0fb78fSIlya Dryomov */ 4067ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4068ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4069ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40703009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4071ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4072dccdb07bSDavid Sterba /* 4073dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4074dccdb07bSDavid Sterba * we'll reexamine the status again. 4075dccdb07bSDavid Sterba */ 4076ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4077ed0fb78fSIlya Dryomov 4078ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40793009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4080ed0fb78fSIlya Dryomov /* this is (3) */ 4081ed0fb78fSIlya Dryomov need_unlock = false; 4082ed0fb78fSIlya Dryomov goto locked; 4083ed0fb78fSIlya Dryomov } 4084ed0fb78fSIlya Dryomov 4085ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4086ed0fb78fSIlya Dryomov goto again; 4087ed0fb78fSIlya Dryomov } else { 4088ed0fb78fSIlya Dryomov /* this is (2) */ 4089ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4090ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4091ed0fb78fSIlya Dryomov goto out; 4092ed0fb78fSIlya Dryomov } 4093ed0fb78fSIlya Dryomov } else { 4094ed0fb78fSIlya Dryomov /* this is (1) */ 4095ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4096e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4097ed0fb78fSIlya Dryomov goto out; 4098ed0fb78fSIlya Dryomov } 4099ed0fb78fSIlya Dryomov 4100ed0fb78fSIlya Dryomov locked: 4101c9e9f97bSIlya Dryomov 4102c9e9f97bSIlya Dryomov if (arg) { 4103c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4104c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4105c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4106ed0fb78fSIlya Dryomov goto out_unlock; 4107c9e9f97bSIlya Dryomov } 4108de322263SIlya Dryomov 4109de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4110de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4111de322263SIlya Dryomov ret = -ENOTCONN; 4112de322263SIlya Dryomov goto out_bargs; 4113de322263SIlya Dryomov } 4114de322263SIlya Dryomov 4115de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4116de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4117de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4118de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4119de322263SIlya Dryomov 4120de322263SIlya Dryomov goto do_balance; 4121de322263SIlya Dryomov } 4122c9e9f97bSIlya Dryomov } else { 4123c9e9f97bSIlya Dryomov bargs = NULL; 4124c9e9f97bSIlya Dryomov } 4125c9e9f97bSIlya Dryomov 4126ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4127837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4128837d5b6eSIlya Dryomov goto out_bargs; 4129837d5b6eSIlya Dryomov } 4130837d5b6eSIlya Dryomov 41318d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4132c9e9f97bSIlya Dryomov if (!bctl) { 4133c9e9f97bSIlya Dryomov ret = -ENOMEM; 4134c9e9f97bSIlya Dryomov goto out_bargs; 4135c9e9f97bSIlya Dryomov } 4136c9e9f97bSIlya Dryomov 4137c9e9f97bSIlya Dryomov if (arg) { 4138c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4139c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4140c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4141c9e9f97bSIlya Dryomov 4142c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4143f43ffb60SIlya Dryomov } else { 4144f43ffb60SIlya Dryomov /* balance everything - no filters */ 4145f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4146c9e9f97bSIlya Dryomov } 4147c9e9f97bSIlya Dryomov 41488eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41498eb93459SDavid Sterba ret = -EINVAL; 41500f89abf5SChristian Engelmayer goto out_bctl; 41518eb93459SDavid Sterba } 41528eb93459SDavid Sterba 4153de322263SIlya Dryomov do_balance: 4154c9e9f97bSIlya Dryomov /* 4155c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4156c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4157c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4158c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4159c9e9f97bSIlya Dryomov */ 4160ed0fb78fSIlya Dryomov need_unlock = false; 4161ed0fb78fSIlya Dryomov 41626fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41630f89abf5SChristian Engelmayer bctl = NULL; 4164ed0fb78fSIlya Dryomov 4165d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4166c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4167c9e9f97bSIlya Dryomov ret = -EFAULT; 4168c9e9f97bSIlya Dryomov } 4169c9e9f97bSIlya Dryomov 41700f89abf5SChristian Engelmayer out_bctl: 41710f89abf5SChristian Engelmayer kfree(bctl); 4172c9e9f97bSIlya Dryomov out_bargs: 4173c9e9f97bSIlya Dryomov kfree(bargs); 4174ed0fb78fSIlya Dryomov out_unlock: 4175c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4176ed0fb78fSIlya Dryomov if (need_unlock) 4177c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4178ed0fb78fSIlya Dryomov out: 4179e54bfa31SLiu Bo mnt_drop_write_file(file); 4180c9e9f97bSIlya Dryomov return ret; 4181c9e9f97bSIlya Dryomov } 4182c9e9f97bSIlya Dryomov 41832ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4184837d5b6eSIlya Dryomov { 4185837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4186837d5b6eSIlya Dryomov return -EPERM; 4187837d5b6eSIlya Dryomov 4188837d5b6eSIlya Dryomov switch (cmd) { 4189837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41900b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4191a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41920b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4193837d5b6eSIlya Dryomov } 4194837d5b6eSIlya Dryomov 4195837d5b6eSIlya Dryomov return -EINVAL; 4196837d5b6eSIlya Dryomov } 4197837d5b6eSIlya Dryomov 41982ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 419919a39dceSIlya Dryomov void __user *arg) 420019a39dceSIlya Dryomov { 420119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 420219a39dceSIlya Dryomov int ret = 0; 420319a39dceSIlya Dryomov 420419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 420519a39dceSIlya Dryomov return -EPERM; 420619a39dceSIlya Dryomov 420719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 420819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 420919a39dceSIlya Dryomov ret = -ENOTCONN; 421019a39dceSIlya Dryomov goto out; 421119a39dceSIlya Dryomov } 421219a39dceSIlya Dryomov 42138d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 421419a39dceSIlya Dryomov if (!bargs) { 421519a39dceSIlya Dryomov ret = -ENOMEM; 421619a39dceSIlya Dryomov goto out; 421719a39dceSIlya Dryomov } 421819a39dceSIlya Dryomov 4219008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 422019a39dceSIlya Dryomov 422119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 422219a39dceSIlya Dryomov ret = -EFAULT; 422319a39dceSIlya Dryomov 422419a39dceSIlya Dryomov kfree(bargs); 422519a39dceSIlya Dryomov out: 422619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 422719a39dceSIlya Dryomov return ret; 422819a39dceSIlya Dryomov } 422919a39dceSIlya Dryomov 4230905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 42315d13a37bSArne Jansen { 42320b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42345d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 42355d13a37bSArne Jansen int ret; 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42385d13a37bSArne Jansen return -EPERM; 42395d13a37bSArne Jansen 4240905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4241905b0ddaSMiao Xie if (ret) 4242905b0ddaSMiao Xie return ret; 42435d13a37bSArne Jansen 42445d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4245905b0ddaSMiao Xie if (IS_ERR(sa)) { 4246905b0ddaSMiao Xie ret = PTR_ERR(sa); 4247905b0ddaSMiao Xie goto drop_write; 4248905b0ddaSMiao Xie } 42495d13a37bSArne Jansen 42500b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42515d13a37bSArne Jansen 42525d13a37bSArne Jansen switch (sa->cmd) { 42535d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4254340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42555d13a37bSArne Jansen break; 42565d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4257340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42585d13a37bSArne Jansen break; 42595d13a37bSArne Jansen default: 42605d13a37bSArne Jansen ret = -EINVAL; 42615d13a37bSArne Jansen break; 42625d13a37bSArne Jansen } 42635d13a37bSArne Jansen 42645d13a37bSArne Jansen kfree(sa); 42650b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4266905b0ddaSMiao Xie drop_write: 4267905b0ddaSMiao Xie mnt_drop_write_file(file); 42685d13a37bSArne Jansen return ret; 42695d13a37bSArne Jansen } 42705d13a37bSArne Jansen 4271905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42725d13a37bSArne Jansen { 42730b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42740b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42750b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42765d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42775d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42785d13a37bSArne Jansen int ret; 42795d13a37bSArne Jansen int err; 42805d13a37bSArne Jansen 42815d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42825d13a37bSArne Jansen return -EPERM; 42835d13a37bSArne Jansen 4284905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4285905b0ddaSMiao Xie if (ret) 4286905b0ddaSMiao Xie return ret; 42875d13a37bSArne Jansen 42885d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4289905b0ddaSMiao Xie if (IS_ERR(sa)) { 4290905b0ddaSMiao Xie ret = PTR_ERR(sa); 4291905b0ddaSMiao Xie goto drop_write; 4292905b0ddaSMiao Xie } 42935d13a37bSArne Jansen 42945d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42955d13a37bSArne Jansen if (IS_ERR(trans)) { 42965d13a37bSArne Jansen ret = PTR_ERR(trans); 42975d13a37bSArne Jansen goto out; 42985d13a37bSArne Jansen } 42995d13a37bSArne Jansen 43005d13a37bSArne Jansen if (sa->assign) { 43019f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 43025d13a37bSArne Jansen } else { 430339616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 43045d13a37bSArne Jansen } 43055d13a37bSArne Jansen 4306e082f563SQu Wenruo /* update qgroup status and info */ 4307280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4308e082f563SQu Wenruo if (err < 0) 43090b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4310ad8403dfSAnand Jain "failed to update qgroup status and info"); 43113a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43125d13a37bSArne Jansen if (err && !ret) 43135d13a37bSArne Jansen ret = err; 43145d13a37bSArne Jansen 43155d13a37bSArne Jansen out: 43165d13a37bSArne Jansen kfree(sa); 4317905b0ddaSMiao Xie drop_write: 4318905b0ddaSMiao Xie mnt_drop_write_file(file); 43195d13a37bSArne Jansen return ret; 43205d13a37bSArne Jansen } 43215d13a37bSArne Jansen 4322905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 43235d13a37bSArne Jansen { 43240b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43250b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43265d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 43275d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43285d13a37bSArne Jansen int ret; 43295d13a37bSArne Jansen int err; 43305d13a37bSArne Jansen 43315d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43325d13a37bSArne Jansen return -EPERM; 43335d13a37bSArne Jansen 4334905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4335905b0ddaSMiao Xie if (ret) 4336905b0ddaSMiao Xie return ret; 43375d13a37bSArne Jansen 43385d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4339905b0ddaSMiao Xie if (IS_ERR(sa)) { 4340905b0ddaSMiao Xie ret = PTR_ERR(sa); 4341905b0ddaSMiao Xie goto drop_write; 4342905b0ddaSMiao Xie } 43435d13a37bSArne Jansen 4344d86e56cfSMiao Xie if (!sa->qgroupid) { 4345d86e56cfSMiao Xie ret = -EINVAL; 4346d86e56cfSMiao Xie goto out; 4347d86e56cfSMiao Xie } 4348d86e56cfSMiao Xie 43495d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43505d13a37bSArne Jansen if (IS_ERR(trans)) { 43515d13a37bSArne Jansen ret = PTR_ERR(trans); 43525d13a37bSArne Jansen goto out; 43535d13a37bSArne Jansen } 43545d13a37bSArne Jansen 43555d13a37bSArne Jansen if (sa->create) { 435649a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43575d13a37bSArne Jansen } else { 43583efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43595d13a37bSArne Jansen } 43605d13a37bSArne Jansen 43613a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43625d13a37bSArne Jansen if (err && !ret) 43635d13a37bSArne Jansen ret = err; 43645d13a37bSArne Jansen 43655d13a37bSArne Jansen out: 43665d13a37bSArne Jansen kfree(sa); 4367905b0ddaSMiao Xie drop_write: 4368905b0ddaSMiao Xie mnt_drop_write_file(file); 43695d13a37bSArne Jansen return ret; 43705d13a37bSArne Jansen } 43715d13a37bSArne Jansen 4372905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43735d13a37bSArne Jansen { 43740b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43750b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43765d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43775d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43785d13a37bSArne Jansen int ret; 43795d13a37bSArne Jansen int err; 43805d13a37bSArne Jansen u64 qgroupid; 43815d13a37bSArne Jansen 43825d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43835d13a37bSArne Jansen return -EPERM; 43845d13a37bSArne Jansen 4385905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4386905b0ddaSMiao Xie if (ret) 4387905b0ddaSMiao Xie return ret; 43885d13a37bSArne Jansen 43895d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4390905b0ddaSMiao Xie if (IS_ERR(sa)) { 4391905b0ddaSMiao Xie ret = PTR_ERR(sa); 4392905b0ddaSMiao Xie goto drop_write; 4393905b0ddaSMiao Xie } 43945d13a37bSArne Jansen 43955d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43965d13a37bSArne Jansen if (IS_ERR(trans)) { 43975d13a37bSArne Jansen ret = PTR_ERR(trans); 43985d13a37bSArne Jansen goto out; 43995d13a37bSArne Jansen } 44005d13a37bSArne Jansen 44015d13a37bSArne Jansen qgroupid = sa->qgroupid; 44025d13a37bSArne Jansen if (!qgroupid) { 44035d13a37bSArne Jansen /* take the current subvol as qgroup */ 44045d13a37bSArne Jansen qgroupid = root->root_key.objectid; 44055d13a37bSArne Jansen } 44065d13a37bSArne Jansen 4407f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 44085d13a37bSArne Jansen 44093a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 44105d13a37bSArne Jansen if (err && !ret) 44115d13a37bSArne Jansen ret = err; 44125d13a37bSArne Jansen 44135d13a37bSArne Jansen out: 44145d13a37bSArne Jansen kfree(sa); 4415905b0ddaSMiao Xie drop_write: 4416905b0ddaSMiao Xie mnt_drop_write_file(file); 44175d13a37bSArne Jansen return ret; 44185d13a37bSArne Jansen } 44195d13a37bSArne Jansen 44202f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 44212f232036SJan Schmidt { 44220b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44242f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44252f232036SJan Schmidt int ret; 44262f232036SJan Schmidt 44272f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44282f232036SJan Schmidt return -EPERM; 44292f232036SJan Schmidt 44302f232036SJan Schmidt ret = mnt_want_write_file(file); 44312f232036SJan Schmidt if (ret) 44322f232036SJan Schmidt return ret; 44332f232036SJan Schmidt 44342f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 44352f232036SJan Schmidt if (IS_ERR(qsa)) { 44362f232036SJan Schmidt ret = PTR_ERR(qsa); 44372f232036SJan Schmidt goto drop_write; 44382f232036SJan Schmidt } 44392f232036SJan Schmidt 44402f232036SJan Schmidt if (qsa->flags) { 44412f232036SJan Schmidt ret = -EINVAL; 44422f232036SJan Schmidt goto out; 44432f232036SJan Schmidt } 44442f232036SJan Schmidt 44450b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44462f232036SJan Schmidt 44472f232036SJan Schmidt out: 44482f232036SJan Schmidt kfree(qsa); 44492f232036SJan Schmidt drop_write: 44502f232036SJan Schmidt mnt_drop_write_file(file); 44512f232036SJan Schmidt return ret; 44522f232036SJan Schmidt } 44532f232036SJan Schmidt 4454b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4455b929c1d8SMarcos Paulo de Souza void __user *arg) 44562f232036SJan Schmidt { 44572f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44582f232036SJan Schmidt int ret = 0; 44592f232036SJan Schmidt 44602f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44612f232036SJan Schmidt return -EPERM; 44622f232036SJan Schmidt 44638d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44642f232036SJan Schmidt if (!qsa) 44652f232036SJan Schmidt return -ENOMEM; 44662f232036SJan Schmidt 44670b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44682f232036SJan Schmidt qsa->flags = 1; 44690b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44702f232036SJan Schmidt } 44712f232036SJan Schmidt 44722f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44732f232036SJan Schmidt ret = -EFAULT; 44742f232036SJan Schmidt 44752f232036SJan Schmidt kfree(qsa); 44762f232036SJan Schmidt return ret; 44772f232036SJan Schmidt } 44782f232036SJan Schmidt 4479b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4480b929c1d8SMarcos Paulo de Souza void __user *arg) 448157254b6eSJan Schmidt { 448257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 448357254b6eSJan Schmidt return -EPERM; 448457254b6eSJan Schmidt 44850b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 448657254b6eSJan Schmidt } 448757254b6eSJan Schmidt 4488abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4489abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44908ea05e3aSAlexander Block { 4491496ad9aaSAl Viro struct inode *inode = file_inode(file); 44920b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44938ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44948ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44958ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 449695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44978ea05e3aSAlexander Block int ret = 0; 4498dd5f9615SStefan Behrens int received_uuid_changed; 44998ea05e3aSAlexander Block 450021cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 4501bd60ea0fSDavid Sterba return -EPERM; 4502bd60ea0fSDavid Sterba 45038ea05e3aSAlexander Block ret = mnt_want_write_file(file); 45048ea05e3aSAlexander Block if (ret < 0) 45058ea05e3aSAlexander Block return ret; 45068ea05e3aSAlexander Block 45070b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 45088ea05e3aSAlexander Block 45094a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 45108ea05e3aSAlexander Block ret = -EINVAL; 45118ea05e3aSAlexander Block goto out; 45128ea05e3aSAlexander Block } 45138ea05e3aSAlexander Block 45148ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 45158ea05e3aSAlexander Block ret = -EROFS; 45168ea05e3aSAlexander Block goto out; 45178ea05e3aSAlexander Block } 45188ea05e3aSAlexander Block 4519dd5f9615SStefan Behrens /* 4520dd5f9615SStefan Behrens * 1 - root item 4521dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4522dd5f9615SStefan Behrens */ 4523dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 45248ea05e3aSAlexander Block if (IS_ERR(trans)) { 45258ea05e3aSAlexander Block ret = PTR_ERR(trans); 45268ea05e3aSAlexander Block trans = NULL; 45278ea05e3aSAlexander Block goto out; 45288ea05e3aSAlexander Block } 45298ea05e3aSAlexander Block 45308ea05e3aSAlexander Block sa->rtransid = trans->transid; 45318ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 45328ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 45338ea05e3aSAlexander Block 4534dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4535dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4536dd5f9615SStefan Behrens if (received_uuid_changed && 4537d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4538d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4539dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4540dd5f9615SStefan Behrens root->root_key.objectid); 4541d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4542d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4543d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4544d87ff758SNikolay Borisov goto out; 4545d87ff758SNikolay Borisov } 4546d87ff758SNikolay Borisov } 45478ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45488ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45498ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45503cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45513cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45523cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45533cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45548ea05e3aSAlexander Block 45550b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45568ea05e3aSAlexander Block &root->root_key, &root->root_item); 45578ea05e3aSAlexander Block if (ret < 0) { 45583a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45598ea05e3aSAlexander Block goto out; 4560dd5f9615SStefan Behrens } 4561dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4562cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4563dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4564dd5f9615SStefan Behrens root->root_key.objectid); 4565dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 456666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4567efd38150SNikolay Borisov btrfs_end_transaction(trans); 4568dd5f9615SStefan Behrens goto out; 4569dd5f9615SStefan Behrens } 4570dd5f9615SStefan Behrens } 45713a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4572abccd00fSHugo Mills out: 45730b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4574abccd00fSHugo Mills mnt_drop_write_file(file); 4575abccd00fSHugo Mills return ret; 4576abccd00fSHugo Mills } 4577abccd00fSHugo Mills 4578abccd00fSHugo Mills #ifdef CONFIG_64BIT 4579abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4580abccd00fSHugo Mills void __user *arg) 4581abccd00fSHugo Mills { 4582abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4583abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4584abccd00fSHugo Mills int ret = 0; 4585abccd00fSHugo Mills 4586abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45877b9ea627SShailendra Verma if (IS_ERR(args32)) 45887b9ea627SShailendra Verma return PTR_ERR(args32); 4589abccd00fSHugo Mills 45908d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 459184dbeb87SDan Carpenter if (!args64) { 459284dbeb87SDan Carpenter ret = -ENOMEM; 4593abccd00fSHugo Mills goto out; 4594abccd00fSHugo Mills } 4595abccd00fSHugo Mills 4596abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4597abccd00fSHugo Mills args64->stransid = args32->stransid; 4598abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4599abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4600abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4601abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4602abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4603abccd00fSHugo Mills args64->flags = args32->flags; 4604abccd00fSHugo Mills 4605abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4606abccd00fSHugo Mills if (ret) 4607abccd00fSHugo Mills goto out; 4608abccd00fSHugo Mills 4609abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4610abccd00fSHugo Mills args32->stransid = args64->stransid; 4611abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4612abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4613abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4614abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4615abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4616abccd00fSHugo Mills args32->flags = args64->flags; 4617abccd00fSHugo Mills 4618abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4619abccd00fSHugo Mills if (ret) 4620abccd00fSHugo Mills ret = -EFAULT; 4621abccd00fSHugo Mills 4622abccd00fSHugo Mills out: 4623abccd00fSHugo Mills kfree(args32); 4624abccd00fSHugo Mills kfree(args64); 4625abccd00fSHugo Mills return ret; 4626abccd00fSHugo Mills } 4627abccd00fSHugo Mills #endif 4628abccd00fSHugo Mills 4629abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4630abccd00fSHugo Mills void __user *arg) 4631abccd00fSHugo Mills { 4632abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4633abccd00fSHugo Mills int ret = 0; 4634abccd00fSHugo Mills 4635abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 46367b9ea627SShailendra Verma if (IS_ERR(sa)) 46377b9ea627SShailendra Verma return PTR_ERR(sa); 4638abccd00fSHugo Mills 4639abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4640abccd00fSHugo Mills 4641abccd00fSHugo Mills if (ret) 4642abccd00fSHugo Mills goto out; 4643abccd00fSHugo Mills 46448ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46458ea05e3aSAlexander Block if (ret) 46468ea05e3aSAlexander Block ret = -EFAULT; 46478ea05e3aSAlexander Block 46488ea05e3aSAlexander Block out: 46498ea05e3aSAlexander Block kfree(sa); 46508ea05e3aSAlexander Block return ret; 46518ea05e3aSAlexander Block } 46528ea05e3aSAlexander Block 4653b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4654b929c1d8SMarcos Paulo de Souza void __user *arg) 4655867ab667Sjeff.liu { 4656a1b83ac5SAnand Jain size_t len; 4657867ab667Sjeff.liu int ret; 4658a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4659a1b83ac5SAnand Jain 46600b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46610b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46620b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4663a1b83ac5SAnand Jain 4664a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4665867ab667Sjeff.liu 4666867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46670b246afaSJeff Mahoney btrfs_warn(fs_info, 46680b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46690b246afaSJeff Mahoney --len); 4670867ab667Sjeff.liu } 4671867ab667Sjeff.liu 4672867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4673867ab667Sjeff.liu 4674867ab667Sjeff.liu return ret ? -EFAULT : 0; 4675867ab667Sjeff.liu } 4676867ab667Sjeff.liu 4677a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4678a8bfd4abSjeff.liu { 46790b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46810b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46820b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4683a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4684a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4685a8bfd4abSjeff.liu int ret; 4686a8bfd4abSjeff.liu 4687a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4688a8bfd4abSjeff.liu return -EPERM; 4689a8bfd4abSjeff.liu 4690a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4691a8bfd4abSjeff.liu return -EFAULT; 4692a8bfd4abSjeff.liu 4693a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46940b246afaSJeff Mahoney btrfs_err(fs_info, 46955d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4696a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4697a8bfd4abSjeff.liu return -EINVAL; 4698a8bfd4abSjeff.liu } 4699a8bfd4abSjeff.liu 4700a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4701a8bfd4abSjeff.liu if (ret) 4702a8bfd4abSjeff.liu return ret; 4703a8bfd4abSjeff.liu 4704a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4705a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4706a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4707a8bfd4abSjeff.liu goto out_unlock; 4708a8bfd4abSjeff.liu } 4709a8bfd4abSjeff.liu 47100b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4711a8bfd4abSjeff.liu strcpy(super_block->label, label); 47120b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47133a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4714a8bfd4abSjeff.liu 4715a8bfd4abSjeff.liu out_unlock: 4716a8bfd4abSjeff.liu mnt_drop_write_file(file); 4717a8bfd4abSjeff.liu return ret; 4718a8bfd4abSjeff.liu } 4719a8bfd4abSjeff.liu 47202eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 47212eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 47222eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 47232eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 47242eaa055fSJeff Mahoney 4725d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 47262eaa055fSJeff Mahoney { 47274d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 47282eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 47292eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 47302eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 47312eaa055fSJeff Mahoney }; 47322eaa055fSJeff Mahoney 47332eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47342eaa055fSJeff Mahoney return -EFAULT; 47352eaa055fSJeff Mahoney 47362eaa055fSJeff Mahoney return 0; 47372eaa055fSJeff Mahoney } 47382eaa055fSJeff Mahoney 4739b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4740b929c1d8SMarcos Paulo de Souza void __user *arg) 47412eaa055fSJeff Mahoney { 47420b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47432eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47442eaa055fSJeff Mahoney 47452eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47462eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47472eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47482eaa055fSJeff Mahoney 47492eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47502eaa055fSJeff Mahoney return -EFAULT; 47512eaa055fSJeff Mahoney 47522eaa055fSJeff Mahoney return 0; 47532eaa055fSJeff Mahoney } 47542eaa055fSJeff Mahoney 47552ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47563b02a68aSJeff Mahoney enum btrfs_feature_set set, 47572eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47582eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47592eaa055fSJeff Mahoney { 4760f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47613b02a68aSJeff Mahoney char *names; 47622eaa055fSJeff Mahoney u64 disallowed, unsupported; 47632eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47642eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47652eaa055fSJeff Mahoney 47662eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47672eaa055fSJeff Mahoney if (unsupported) { 47683b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47693b02a68aSJeff Mahoney if (names) { 47700b246afaSJeff Mahoney btrfs_warn(fs_info, 47713b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47723b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47733b02a68aSJeff Mahoney kfree(names); 47743b02a68aSJeff Mahoney } else 47750b246afaSJeff Mahoney btrfs_warn(fs_info, 47762eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47772eaa055fSJeff Mahoney type, unsupported); 47782eaa055fSJeff Mahoney return -EOPNOTSUPP; 47792eaa055fSJeff Mahoney } 47802eaa055fSJeff Mahoney 47812eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47822eaa055fSJeff Mahoney if (disallowed) { 47833b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47843b02a68aSJeff Mahoney if (names) { 47850b246afaSJeff Mahoney btrfs_warn(fs_info, 47863b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47873b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47883b02a68aSJeff Mahoney kfree(names); 47893b02a68aSJeff Mahoney } else 47900b246afaSJeff Mahoney btrfs_warn(fs_info, 47912eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47922eaa055fSJeff Mahoney type, disallowed); 47932eaa055fSJeff Mahoney return -EPERM; 47942eaa055fSJeff Mahoney } 47952eaa055fSJeff Mahoney 47962eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47972eaa055fSJeff Mahoney if (disallowed) { 47983b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47993b02a68aSJeff Mahoney if (names) { 48000b246afaSJeff Mahoney btrfs_warn(fs_info, 48013b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 48023b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 48033b02a68aSJeff Mahoney kfree(names); 48043b02a68aSJeff Mahoney } else 48050b246afaSJeff Mahoney btrfs_warn(fs_info, 48062eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 48072eaa055fSJeff Mahoney type, disallowed); 48082eaa055fSJeff Mahoney return -EPERM; 48092eaa055fSJeff Mahoney } 48102eaa055fSJeff Mahoney 48112eaa055fSJeff Mahoney return 0; 48122eaa055fSJeff Mahoney } 48132eaa055fSJeff Mahoney 48142ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 48152ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 48162eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 48172eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 48182eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 48192eaa055fSJeff Mahoney 48202eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 48212eaa055fSJeff Mahoney { 48220b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48240b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48250b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 48262eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 48272eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 48282eaa055fSJeff Mahoney u64 newflags; 48292eaa055fSJeff Mahoney int ret; 48302eaa055fSJeff Mahoney 48312eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 48322eaa055fSJeff Mahoney return -EPERM; 48332eaa055fSJeff Mahoney 48342eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 48352eaa055fSJeff Mahoney return -EFAULT; 48362eaa055fSJeff Mahoney 48372eaa055fSJeff Mahoney /* Nothing to do */ 48382eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48392eaa055fSJeff Mahoney !flags[0].incompat_flags) 48402eaa055fSJeff Mahoney return 0; 48412eaa055fSJeff Mahoney 48422ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 48432eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48442eaa055fSJeff Mahoney if (ret) 48452eaa055fSJeff Mahoney return ret; 48462eaa055fSJeff Mahoney 48472ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48482eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48492eaa055fSJeff Mahoney if (ret) 48502eaa055fSJeff Mahoney return ret; 48512eaa055fSJeff Mahoney 48522ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48532eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48542eaa055fSJeff Mahoney if (ret) 48552eaa055fSJeff Mahoney return ret; 48562eaa055fSJeff Mahoney 48577ab19625SDavid Sterba ret = mnt_want_write_file(file); 48587ab19625SDavid Sterba if (ret) 48597ab19625SDavid Sterba return ret; 48607ab19625SDavid Sterba 48618051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48627ab19625SDavid Sterba if (IS_ERR(trans)) { 48637ab19625SDavid Sterba ret = PTR_ERR(trans); 48647ab19625SDavid Sterba goto out_drop_write; 48657ab19625SDavid Sterba } 48662eaa055fSJeff Mahoney 48670b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48682eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48692eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48702eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48712eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48722eaa055fSJeff Mahoney 48732eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48742eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48752eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48762eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48772eaa055fSJeff Mahoney 48782eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48792eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48802eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48812eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48820b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48832eaa055fSJeff Mahoney 48843a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48857ab19625SDavid Sterba out_drop_write: 48867ab19625SDavid Sterba mnt_drop_write_file(file); 48877ab19625SDavid Sterba 48887ab19625SDavid Sterba return ret; 48892eaa055fSJeff Mahoney } 48902eaa055fSJeff Mahoney 48912351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48922351f431SJosef Bacik { 48932351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48942351f431SJosef Bacik int ret; 48952351f431SJosef Bacik 48962351f431SJosef Bacik if (compat) { 48972351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48982351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48992351f431SJosef Bacik 49002351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 49012351f431SJosef Bacik if (ret) 49022351f431SJosef Bacik return -EFAULT; 49032351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 49042351f431SJosef Bacik if (!arg) 49052351f431SJosef Bacik return -ENOMEM; 49062351f431SJosef Bacik arg->send_fd = args32.send_fd; 49072351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 49082351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 49092351f431SJosef Bacik arg->parent_root = args32.parent_root; 49102351f431SJosef Bacik arg->flags = args32.flags; 49112351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 49122351f431SJosef Bacik sizeof(args32.reserved)); 49132351f431SJosef Bacik #else 49142351f431SJosef Bacik return -ENOTTY; 49152351f431SJosef Bacik #endif 49162351f431SJosef Bacik } else { 49172351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 49182351f431SJosef Bacik if (IS_ERR(arg)) 49192351f431SJosef Bacik return PTR_ERR(arg); 49202351f431SJosef Bacik } 49212351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 49222351f431SJosef Bacik kfree(arg); 49232351f431SJosef Bacik return ret; 49242351f431SJosef Bacik } 49252351f431SJosef Bacik 4926f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4927f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4928f46b5a66SChristoph Hellwig { 49290b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49300b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49310b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49324bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4933f46b5a66SChristoph Hellwig 4934f46b5a66SChristoph Hellwig switch (cmd) { 49356cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 49366cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 49376cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 49386cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 49396cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49406cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 494140cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4942b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 494340cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 494440cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4945f7039b1dSLi Dongyang case FITRIM: 4946b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4947f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4948fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4949fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4950fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49513de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4952fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49536f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49546f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 495576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4956949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4957949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4958949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49590caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49600caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49610caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49620caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49636ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49646ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4965f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49661e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49671e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49681e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4969f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4970198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4971f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49722ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4973f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4974da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49756b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49766b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4977475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49782ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4979475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49802ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4981f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49829ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4983ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4984ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4985cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4986cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4987ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4988ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4989d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4990d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4991d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4992d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4993d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4994d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49951406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49962ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49979b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49989b199859SFilipe David Borba Manana int ret; 49999b199859SFilipe David Borba Manana 50009db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 50019b199859SFilipe David Borba Manana if (ret) 50029b199859SFilipe David Borba Manana return ret; 50030b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 50042fad4e83SDavid Sterba /* 50052fad4e83SDavid Sterba * The transaction thread may want to do more work, 500601327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 50072fad4e83SDavid Sterba * processing uncleaned subvols. 50082fad4e83SDavid Sterba */ 50090b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 50109b199859SFilipe David Borba Manana return ret; 50119b199859SFilipe David Borba Manana } 501246204592SSage Weil case BTRFS_IOC_START_SYNC: 50139a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 501446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 50152ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5016475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5017b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5018475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 50192ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5020475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 50212ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5022c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 50239ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5024837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 50252ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 502619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 50272ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 50288ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 50298ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5030abccd00fSHugo Mills #ifdef CONFIG_64BIT 5031abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5032abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5033abccd00fSHugo Mills #endif 503431db9f7cSAlexander Block case BTRFS_IOC_SEND: 50352351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 50362351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50372351f431SJosef Bacik case BTRFS_IOC_SEND_32: 50382351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 50392351f431SJosef Bacik #endif 5040c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 50412ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 50425d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5043905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50445d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5045905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50465d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5047905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50485d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5049905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50502f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50512f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50522f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5053b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 505457254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5055b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50563f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50572ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50582eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5059d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50602eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5061b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50622eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50632eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5064e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5065e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5066025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5067025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5068b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5069b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 507042e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 507142e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 507223d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 507323d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5074f46b5a66SChristoph Hellwig } 5075f46b5a66SChristoph Hellwig 5076f46b5a66SChristoph Hellwig return -ENOTTY; 5077f46b5a66SChristoph Hellwig } 50784c63c245SLuke Dashjr 50794c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50804c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50814c63c245SLuke Dashjr { 50822a362249SJeff Mahoney /* 50832a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50842a362249SJeff Mahoney * handling is necessary. 50852a362249SJeff Mahoney */ 50864c63c245SLuke Dashjr switch (cmd) { 50874c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 50884c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 50894c63c245SLuke Dashjr break; 50904c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 50914c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 50924c63c245SLuke Dashjr break; 50934c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50944c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50954c63c245SLuke Dashjr break; 50964c63c245SLuke Dashjr } 50974c63c245SLuke Dashjr 50984c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50994c63c245SLuke Dashjr } 51004c63c245SLuke Dashjr #endif 5101