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 free_extent_buffer(leaf); 701f46b5a66SChristoph Hellwig leaf = NULL; 702f46b5a66SChristoph Hellwig 70369948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 704f46b5a66SChristoph Hellwig 705f46b5a66SChristoph Hellwig key.objectid = objectid; 7065d4f98a2SYan Zheng key.offset = 0; 707962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7080b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70949a3c4d9SDavid Sterba root_item); 710f46b5a66SChristoph Hellwig if (ret) 711f46b5a66SChristoph Hellwig goto fail; 712f46b5a66SChristoph Hellwig 71376dda93cSYan, Zheng key.offset = (u64)-1; 7142dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 7162dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 71779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 71979787eaaSJeff Mahoney goto fail; 72079787eaaSJeff Mahoney } 7212dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 7222dfb1e43SQu Wenruo anon_dev = 0; 72376dda93cSYan, Zheng 724*221581e4SJosef Bacik ret = btrfs_record_root_in_trans(trans, new_root); 725*221581e4SJosef Bacik if (ret) { 726*221581e4SJosef Bacik btrfs_put_root(new_root); 727*221581e4SJosef Bacik btrfs_abort_transaction(trans, ret); 728*221581e4SJosef Bacik goto fail; 729*221581e4SJosef Bacik } 73076dda93cSYan, Zheng 73169948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 73200246528SJosef Bacik btrfs_put_root(new_root); 733ce598979SMark Fasheh if (ret) { 734ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 73566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 736ce598979SMark Fasheh goto fail; 737ce598979SMark Fasheh } 738ce598979SMark Fasheh 739f46b5a66SChristoph Hellwig /* 740f46b5a66SChristoph Hellwig * insert the directory item 741f46b5a66SChristoph Hellwig */ 742877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 74379787eaaSJeff Mahoney if (ret) { 74466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 74579787eaaSJeff Mahoney goto fail; 74679787eaaSJeff Mahoney } 7473de4586cSChris Mason 748684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7493de4586cSChris Mason BTRFS_FT_DIR, index); 75079787eaaSJeff Mahoney if (ret) { 75166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 752f46b5a66SChristoph Hellwig goto fail; 75379787eaaSJeff Mahoney } 7540660b5afSChris Mason 7556ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7569a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 757c7e54b51SJosef Bacik if (ret) { 758c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 759c7e54b51SJosef Bacik goto fail; 760c7e54b51SJosef Bacik } 76152c26179SYan Zheng 7626025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7634a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 764c7e54b51SJosef Bacik if (ret) { 765c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 766c7e54b51SJosef Bacik goto fail; 767c7e54b51SJosef Bacik } 7680660b5afSChris Mason 769cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7706bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 771dd5f9615SStefan Behrens if (ret) 77266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 773dd5f9615SStefan Behrens 774f46b5a66SChristoph Hellwig fail: 77549a3c4d9SDavid Sterba kfree(root_item); 776d5c12070SMiao Xie trans->block_rsv = NULL; 777d5c12070SMiao Xie trans->bytes_reserved = 0; 778e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 779de6e8200SLiu Bo 7803a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 781f46b5a66SChristoph Hellwig if (err && !ret) 782f46b5a66SChristoph Hellwig ret = err; 7831a65e24bSChris Mason 7845662344bSTsutomu Itoh if (!ret) { 7855662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 786de6e8200SLiu Bo if (IS_ERR(inode)) 787de6e8200SLiu Bo return PTR_ERR(inode); 7885662344bSTsutomu Itoh d_instantiate(dentry, inode); 7895662344bSTsutomu Itoh } 790f46b5a66SChristoph Hellwig return ret; 79149a3c4d9SDavid Sterba 79249a3c4d9SDavid Sterba fail_free: 7932dfb1e43SQu Wenruo if (anon_dev) 7942dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 79549a3c4d9SDavid Sterba kfree(root_item); 79649a3c4d9SDavid Sterba return ret; 797f46b5a66SChristoph Hellwig } 798f46b5a66SChristoph Hellwig 799e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 8009babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 801e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 802f46b5a66SChristoph Hellwig { 8030b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 8042e4bfab9SYan, Zheng struct inode *inode; 805f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 806f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 8072e4bfab9SYan, Zheng int ret; 808f46b5a66SChristoph Hellwig 80992a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 810f46b5a66SChristoph Hellwig return -EINVAL; 811f46b5a66SChristoph Hellwig 812eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 813eede2bf3SOmar Sandoval btrfs_warn(fs_info, 814eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 815eede2bf3SOmar Sandoval return -ETXTBSY; 816eede2bf3SOmar Sandoval } 817eede2bf3SOmar Sandoval 81823269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 819a1ee7362SDavid Sterba if (!pending_snapshot) 820a1ee7362SDavid Sterba return -ENOMEM; 821a1ee7362SDavid Sterba 8222dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8232dfb1e43SQu Wenruo if (ret < 0) 8242dfb1e43SQu Wenruo goto free_pending; 825b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 82623269bf5SDavid Sterba GFP_KERNEL); 8278546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8288546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 829b0c0ea63SDavid Sterba ret = -ENOMEM; 830b0c0ea63SDavid Sterba goto free_pending; 831b0c0ea63SDavid Sterba } 832b0c0ea63SDavid Sterba 83366d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 83466d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 835d5c12070SMiao Xie /* 836d5c12070SMiao Xie * 1 - parent dir inode 837d5c12070SMiao Xie * 2 - dir entries 838d5c12070SMiao Xie * 1 - root item 839d5c12070SMiao Xie * 2 - root ref/backref 840d5c12070SMiao Xie * 1 - root of snapshot 841dd5f9615SStefan Behrens * 1 - UUID item 842d5c12070SMiao Xie */ 843d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 844dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 845ee3441b4SJeff Mahoney false); 846d5c12070SMiao Xie if (ret) 847c11fbb6eSRobbie Ko goto free_pending; 848d5c12070SMiao Xie 849a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 850a22285a6SYan, Zheng pending_snapshot->root = root; 851b83cc969SLi Zefan pending_snapshot->readonly = readonly; 852e9662f70SMiao Xie pending_snapshot->dir = dir; 8538696c533SMiao Xie pending_snapshot->inherit = inherit; 854a22285a6SYan, Zheng 855d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 856a22285a6SYan, Zheng if (IS_ERR(trans)) { 857a22285a6SYan, Zheng ret = PTR_ERR(trans); 858a22285a6SYan, Zheng goto fail; 859a22285a6SYan, Zheng } 860a22285a6SYan, Zheng 8610b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 862a22285a6SYan, Zheng list_add(&pending_snapshot->list, 863a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8640b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8659babda9fSNikolay Borisov 8663a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 867aec8030aSMiao Xie if (ret) 868c37b2b62SJosef Bacik goto fail; 869a22285a6SYan, Zheng 870a22285a6SYan, Zheng ret = pending_snapshot->error; 871f46b5a66SChristoph Hellwig if (ret) 8722e4bfab9SYan, Zheng goto fail; 873f46b5a66SChristoph Hellwig 874d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 875d3797308SChris Mason if (ret) 876d3797308SChris Mason goto fail; 877d3797308SChris Mason 8782b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8792e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8802e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8812e4bfab9SYan, Zheng goto fail; 8822e4bfab9SYan, Zheng } 8835662344bSTsutomu Itoh 8842e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8852e4bfab9SYan, Zheng ret = 0; 8862dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8872e4bfab9SYan, Zheng fail: 8882dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8892dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8902dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 89100246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 892e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 893b0c0ea63SDavid Sterba free_pending: 8942dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8952dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 896b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8978546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 898a1ee7362SDavid Sterba kfree(pending_snapshot); 899a1ee7362SDavid Sterba 900f46b5a66SChristoph Hellwig return ret; 901f46b5a66SChristoph Hellwig } 902f46b5a66SChristoph Hellwig 9034260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 9044260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 9054260f7c7SSage Weil * whether the type of victim is right. 9064260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 9074260f7c7SSage Weil * 2. We should have write and exec permissions on dir 9084260f7c7SSage Weil * 3. We can't remove anything from append-only dir 9094260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 9104260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 9114260f7c7SSage Weil * a. be owner of dir, or 9124260f7c7SSage Weil * b. be owner of victim, or 9134260f7c7SSage Weil * c. have CAP_FOWNER capability 91401327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 9154260f7c7SSage Weil * links pointing to it. 9164260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 9174260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 9184260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 9194260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9204260f7c7SSage Weil * nfs_async_unlink(). 9214260f7c7SSage Weil */ 9224260f7c7SSage Weil 9234260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9244260f7c7SSage Weil { 9254260f7c7SSage Weil int error; 9264260f7c7SSage Weil 9272b0143b5SDavid Howells if (d_really_is_negative(victim)) 9284260f7c7SSage Weil return -ENOENT; 9294260f7c7SSage Weil 9302b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9314fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9324260f7c7SSage Weil 93347291baaSChristian Brauner error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 9344260f7c7SSage Weil if (error) 9354260f7c7SSage Weil return error; 9364260f7c7SSage Weil if (IS_APPEND(dir)) 9374260f7c7SSage Weil return -EPERM; 938ba73d987SChristian Brauner if (check_sticky(&init_user_ns, dir, d_inode(victim)) || 939ba73d987SChristian Brauner IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || 940ba73d987SChristian Brauner IS_SWAPFILE(d_inode(victim))) 9414260f7c7SSage Weil return -EPERM; 9424260f7c7SSage Weil if (isdir) { 943e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9444260f7c7SSage Weil return -ENOTDIR; 9454260f7c7SSage Weil if (IS_ROOT(victim)) 9464260f7c7SSage Weil return -EBUSY; 947e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9484260f7c7SSage Weil return -EISDIR; 9494260f7c7SSage Weil if (IS_DEADDIR(dir)) 9504260f7c7SSage Weil return -ENOENT; 9514260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9524260f7c7SSage Weil return -EBUSY; 9534260f7c7SSage Weil return 0; 9544260f7c7SSage Weil } 9554260f7c7SSage Weil 956cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 957cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 958cb8e7090SChristoph Hellwig { 9592b0143b5SDavid Howells if (d_really_is_positive(child)) 960cb8e7090SChristoph Hellwig return -EEXIST; 961cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 962cb8e7090SChristoph Hellwig return -ENOENT; 96347291baaSChristian Brauner return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 964cb8e7090SChristoph Hellwig } 965cb8e7090SChristoph Hellwig 966cb8e7090SChristoph Hellwig /* 967cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 968cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 969cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 970cb8e7090SChristoph Hellwig */ 97192872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 97252f75f4fSDavid Sterba const char *name, int namelen, 97372fd032eSSage Weil struct btrfs_root *snap_src, 9749babda9fSNikolay Borisov bool readonly, 9758696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 976cb8e7090SChristoph Hellwig { 9772b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 979cb8e7090SChristoph Hellwig struct dentry *dentry; 980cb8e7090SChristoph Hellwig int error; 981cb8e7090SChristoph Hellwig 98200235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 98300235411SAl Viro if (error == -EINTR) 98400235411SAl Viro return error; 985cb8e7090SChristoph Hellwig 986cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 987cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 988cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 989cb8e7090SChristoph Hellwig goto out_unlock; 990cb8e7090SChristoph Hellwig 99176dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 992cb8e7090SChristoph Hellwig if (error) 993a874a63eSLiu Bo goto out_dput; 994cb8e7090SChristoph Hellwig 9959c52057cSChris Mason /* 9969c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9979c52057cSChris Mason * check for them now when we can safely fail 9989c52057cSChris Mason */ 9999c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 10009c52057cSChris Mason dir->i_ino, name, 10019c52057cSChris Mason namelen); 10029c52057cSChris Mason if (error) 10039c52057cSChris Mason goto out_dput; 10049c52057cSChris Mason 10050b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 100676dda93cSYan, Zheng 100776dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 100876dda93cSYan, Zheng goto out_up_read; 100976dda93cSYan, Zheng 10109babda9fSNikolay Borisov if (snap_src) 10119babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 10129babda9fSNikolay Borisov else 10139babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 10149babda9fSNikolay Borisov 101576dda93cSYan, Zheng if (!error) 101676dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 101776dda93cSYan, Zheng out_up_read: 10180b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1019cb8e7090SChristoph Hellwig out_dput: 1020cb8e7090SChristoph Hellwig dput(dentry); 1021cb8e7090SChristoph Hellwig out_unlock: 102264708539SJosef Bacik btrfs_inode_unlock(dir, 0); 1023cb8e7090SChristoph Hellwig return error; 1024cb8e7090SChristoph Hellwig } 1025cb8e7090SChristoph Hellwig 1026c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1027c11fbb6eSRobbie Ko const char *name, int namelen, 1028c11fbb6eSRobbie Ko struct btrfs_root *root, 1029c11fbb6eSRobbie Ko bool readonly, 1030c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1031c11fbb6eSRobbie Ko { 1032c11fbb6eSRobbie Ko int ret; 1033c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1034c11fbb6eSRobbie Ko 1035c11fbb6eSRobbie Ko /* 1036c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1037c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1038c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1039c11fbb6eSRobbie Ko */ 1040c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1041c11fbb6eSRobbie Ko 1042c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1043c11fbb6eSRobbie Ko if (ret) 1044c11fbb6eSRobbie Ko goto out; 1045c11fbb6eSRobbie Ko 1046c11fbb6eSRobbie Ko /* 1047c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1048c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1049c11fbb6eSRobbie Ko * creation. 1050c11fbb6eSRobbie Ko */ 1051c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1052c11fbb6eSRobbie Ko snapshot_force_cow = true; 1053c11fbb6eSRobbie Ko 1054c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1055c11fbb6eSRobbie Ko 1056c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1057c11fbb6eSRobbie Ko root, readonly, inherit); 1058c11fbb6eSRobbie Ko out: 1059c11fbb6eSRobbie Ko if (snapshot_force_cow) 1060c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1061c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1062c11fbb6eSRobbie Ko return ret; 1063c11fbb6eSRobbie Ko } 1064c11fbb6eSRobbie Ko 10654cb5300bSChris Mason /* 10664cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10674cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10684cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10694cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10704cb5300bSChris Mason * part of the file 10714cb5300bSChris Mason */ 1072aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10734cb5300bSChris Mason { 10744cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10754cb5300bSChris Mason struct extent_map *em = NULL; 10764cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10774cb5300bSChris Mason u64 end; 10784cb5300bSChris Mason 10794cb5300bSChris Mason read_lock(&em_tree->lock); 108009cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10814cb5300bSChris Mason read_unlock(&em_tree->lock); 10824cb5300bSChris Mason 10834cb5300bSChris Mason if (em) { 10844cb5300bSChris Mason end = extent_map_end(em); 10854cb5300bSChris Mason free_extent_map(em); 10864cb5300bSChris Mason if (end - offset > thresh) 10874cb5300bSChris Mason return 0; 10884cb5300bSChris Mason } 10894cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10904cb5300bSChris Mason thresh /= 2; 10914cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10924cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10934cb5300bSChris Mason if (end >= thresh) 10944cb5300bSChris Mason return 0; 10954cb5300bSChris Mason return 1; 10964cb5300bSChris Mason } 10974cb5300bSChris Mason 10984cb5300bSChris Mason /* 10994cb5300bSChris Mason * helper function to walk through a file and find extents 11004cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 11014cb5300bSChris Mason * 11024cb5300bSChris Mason * This is used by the defragging code to find new and small 11034cb5300bSChris Mason * extents 11044cb5300bSChris Mason */ 11054cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 11064cb5300bSChris Mason struct inode *inode, u64 newer_than, 1107aab110abSDavid Sterba u64 *off, u32 thresh) 11084cb5300bSChris Mason { 11094cb5300bSChris Mason struct btrfs_path *path; 11104cb5300bSChris Mason struct btrfs_key min_key; 11114cb5300bSChris Mason struct extent_buffer *leaf; 11124cb5300bSChris Mason struct btrfs_file_extent_item *extent; 11134cb5300bSChris Mason int type; 11144cb5300bSChris Mason int ret; 11154a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 11164cb5300bSChris Mason 11174cb5300bSChris Mason path = btrfs_alloc_path(); 11184cb5300bSChris Mason if (!path) 11194cb5300bSChris Mason return -ENOMEM; 11204cb5300bSChris Mason 1121a4689d2bSDavid Sterba min_key.objectid = ino; 11224cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 11234cb5300bSChris Mason min_key.offset = *off; 11244cb5300bSChris Mason 11254cb5300bSChris Mason while (1) { 11266174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 11274cb5300bSChris Mason if (ret != 0) 11284cb5300bSChris Mason goto none; 1129f094c9bdSFilipe Manana process_slot: 1130a4689d2bSDavid Sterba if (min_key.objectid != ino) 11314cb5300bSChris Mason goto none; 11324cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11334cb5300bSChris Mason goto none; 11344cb5300bSChris Mason 11354cb5300bSChris Mason leaf = path->nodes[0]; 11364cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11374cb5300bSChris Mason struct btrfs_file_extent_item); 11384cb5300bSChris Mason 11394cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11404cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11414cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11424cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11434cb5300bSChris Mason *off = min_key.offset; 11444cb5300bSChris Mason btrfs_free_path(path); 11454cb5300bSChris Mason return 0; 11464cb5300bSChris Mason } 11474cb5300bSChris Mason 1148f094c9bdSFilipe Manana path->slots[0]++; 1149f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1150f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1151f094c9bdSFilipe Manana goto process_slot; 1152f094c9bdSFilipe Manana } 1153f094c9bdSFilipe Manana 11544cb5300bSChris Mason if (min_key.offset == (u64)-1) 11554cb5300bSChris Mason goto none; 11564cb5300bSChris Mason 11574cb5300bSChris Mason min_key.offset++; 11584cb5300bSChris Mason btrfs_release_path(path); 11594cb5300bSChris Mason } 11604cb5300bSChris Mason none: 11614cb5300bSChris Mason btrfs_free_path(path); 11624cb5300bSChris Mason return -ENOENT; 11634cb5300bSChris Mason } 11644cb5300bSChris Mason 11656c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 116617ce6ef8SLiu Bo { 116717ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1168940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11696c282eb4SLi Zefan struct extent_map *em; 117009cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1171940100a4SChris Mason 1172940100a4SChris Mason /* 1173940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1174940100a4SChris Mason * the full extent lock 1175940100a4SChris Mason */ 1176940100a4SChris Mason read_lock(&em_tree->lock); 1177940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1178940100a4SChris Mason read_unlock(&em_tree->lock); 1179940100a4SChris Mason 1180940100a4SChris Mason if (!em) { 1181308d9800SFilipe Manana struct extent_state *cached = NULL; 1182308d9800SFilipe Manana u64 end = start + len - 1; 1183308d9800SFilipe Manana 1184940100a4SChris Mason /* get the big lock and read metadata off disk */ 1185ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 118639b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1187e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1188940100a4SChris Mason 11896cf8bfbfSDan Carpenter if (IS_ERR(em)) 11906c282eb4SLi Zefan return NULL; 1191940100a4SChris Mason } 1192940100a4SChris Mason 11936c282eb4SLi Zefan return em; 11946c282eb4SLi Zefan } 11956c282eb4SLi Zefan 11966c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11976c282eb4SLi Zefan { 11986c282eb4SLi Zefan struct extent_map *next; 11996c282eb4SLi Zefan bool ret = true; 12006c282eb4SLi Zefan 12016c282eb4SLi Zefan /* this is the last extent */ 12026c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 12036c282eb4SLi Zefan return false; 12046c282eb4SLi Zefan 12056c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1206e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1207e9512d72SChris Mason ret = false; 1208e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1209ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 12106c282eb4SLi Zefan ret = false; 12116c282eb4SLi Zefan 12126c282eb4SLi Zefan free_extent_map(next); 12136c282eb4SLi Zefan return ret; 12146c282eb4SLi Zefan } 12156c282eb4SLi Zefan 1216aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1217a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1218a43a2111SAndrew Mahone int compress) 12196c282eb4SLi Zefan { 12206c282eb4SLi Zefan struct extent_map *em; 12216c282eb4SLi Zefan int ret = 1; 12226c282eb4SLi Zefan bool next_mergeable = true; 12234a3560c4SLiu Bo bool prev_mergeable = true; 12246c282eb4SLi Zefan 12256c282eb4SLi Zefan /* 12266c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 12276c282eb4SLi Zefan * defragging it 12286c282eb4SLi Zefan */ 12296c282eb4SLi Zefan if (start < *defrag_end) 12306c282eb4SLi Zefan return 1; 12316c282eb4SLi Zefan 12326c282eb4SLi Zefan *skip = 0; 12336c282eb4SLi Zefan 12346c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12356c282eb4SLi Zefan if (!em) 12366c282eb4SLi Zefan return 0; 12376c282eb4SLi Zefan 1238940100a4SChris Mason /* this will cover holes, and inline extents */ 123917ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1240940100a4SChris Mason ret = 0; 124117ce6ef8SLiu Bo goto out; 124217ce6ef8SLiu Bo } 124317ce6ef8SLiu Bo 12444a3560c4SLiu Bo if (!*defrag_end) 12454a3560c4SLiu Bo prev_mergeable = false; 12464a3560c4SLiu Bo 12476c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1248940100a4SChris Mason /* 12496c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12506c282eb4SLi Zefan * real extent, don't bother defragging it 1251940100a4SChris Mason */ 1252a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12534a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1254940100a4SChris Mason ret = 0; 125517ce6ef8SLiu Bo out: 1256940100a4SChris Mason /* 1257940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1258940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1259940100a4SChris Mason * so that the next tiny extent will force a defrag. 1260940100a4SChris Mason * 1261940100a4SChris Mason * The end result of this is that tiny extents before a single big 1262940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1263940100a4SChris Mason */ 1264940100a4SChris Mason if (ret) { 1265940100a4SChris Mason *defrag_end = extent_map_end(em); 1266940100a4SChris Mason } else { 1267940100a4SChris Mason *last_len = 0; 1268940100a4SChris Mason *skip = extent_map_end(em); 1269940100a4SChris Mason *defrag_end = 0; 1270940100a4SChris Mason } 1271940100a4SChris Mason 1272940100a4SChris Mason free_extent_map(em); 1273940100a4SChris Mason return ret; 1274940100a4SChris Mason } 1275940100a4SChris Mason 12764cb5300bSChris Mason /* 12774cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12784cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12794cb5300bSChris Mason * to COW and defrag. 12804cb5300bSChris Mason * 12814cb5300bSChris Mason * It also makes sure the delalloc code has enough 12824cb5300bSChris Mason * dirty data to avoid making new small extents as part 12834cb5300bSChris Mason * of the defrag 12844cb5300bSChris Mason * 12854cb5300bSChris Mason * It's a good idea to start RA on this range 12864cb5300bSChris Mason * before calling this. 12874cb5300bSChris Mason */ 12884cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12894cb5300bSChris Mason struct page **pages, 12904cb5300bSChris Mason unsigned long start_index, 1291c41570c9SJustin Maggard unsigned long num_pages) 1292f46b5a66SChristoph Hellwig { 12934cb5300bSChris Mason unsigned long file_end; 12944cb5300bSChris Mason u64 isize = i_size_read(inode); 1295f46b5a66SChristoph Hellwig u64 page_start; 1296f46b5a66SChristoph Hellwig u64 page_end; 12971f12bd06SLiu Bo u64 page_cnt; 1298a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 12997f458a38SFilipe Manana u64 search_start; 13004cb5300bSChris Mason int ret; 13014cb5300bSChris Mason int i; 13024cb5300bSChris Mason int i_done; 13034cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 13044cb5300bSChris Mason struct extent_state *cached_state = NULL; 1305600a45e1SMiao Xie struct extent_io_tree *tree; 1306364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 13073b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 13084cb5300bSChris Mason 130909cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 13101f12bd06SLiu Bo if (!isize || start_index > file_end) 13111f12bd06SLiu Bo return 0; 13121f12bd06SLiu Bo 13131f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13144cb5300bSChris Mason 1315e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1316a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13174cb5300bSChris Mason if (ret) 13184cb5300bSChris Mason return ret; 13194cb5300bSChris Mason i_done = 0; 1320600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 13214cb5300bSChris Mason 13224cb5300bSChris Mason /* step one, lock all the pages */ 13231f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13244cb5300bSChris Mason struct page *page; 1325600a45e1SMiao Xie again: 1326a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 13273b16a4e3SJosef Bacik start_index + i, mask); 13284cb5300bSChris Mason if (!page) 13294cb5300bSChris Mason break; 13304cb5300bSChris Mason 133132443de3SQu Wenruo ret = set_page_extent_mapped(page); 133232443de3SQu Wenruo if (ret < 0) { 133332443de3SQu Wenruo unlock_page(page); 133432443de3SQu Wenruo put_page(page); 133532443de3SQu Wenruo break; 133632443de3SQu Wenruo } 133732443de3SQu Wenruo 1338600a45e1SMiao Xie page_start = page_offset(page); 133909cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1340600a45e1SMiao Xie while (1) { 1341308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1342ff13db41SDavid Sterba &cached_state); 1343c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1344600a45e1SMiao Xie page_start); 1345308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1346e43bbe5eSDavid Sterba &cached_state); 1347600a45e1SMiao Xie if (!ordered) 1348600a45e1SMiao Xie break; 1349600a45e1SMiao Xie 1350600a45e1SMiao Xie unlock_page(page); 1351c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1352600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1353600a45e1SMiao Xie lock_page(page); 13541f12bd06SLiu Bo /* 13551f12bd06SLiu Bo * we unlocked the page above, so we need check if 13561f12bd06SLiu Bo * it was released or not. 13571f12bd06SLiu Bo */ 13581f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13591f12bd06SLiu Bo unlock_page(page); 136009cbfeafSKirill A. Shutemov put_page(page); 13611f12bd06SLiu Bo goto again; 13621f12bd06SLiu Bo } 1363600a45e1SMiao Xie } 1364600a45e1SMiao Xie 13654cb5300bSChris Mason if (!PageUptodate(page)) { 13664cb5300bSChris Mason btrfs_readpage(NULL, page); 13674cb5300bSChris Mason lock_page(page); 13684cb5300bSChris Mason if (!PageUptodate(page)) { 13694cb5300bSChris Mason unlock_page(page); 137009cbfeafSKirill A. Shutemov put_page(page); 13714cb5300bSChris Mason ret = -EIO; 13724cb5300bSChris Mason break; 13734cb5300bSChris Mason } 13744cb5300bSChris Mason } 1375600a45e1SMiao Xie 1376600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1377600a45e1SMiao Xie unlock_page(page); 137809cbfeafSKirill A. Shutemov put_page(page); 1379600a45e1SMiao Xie goto again; 1380600a45e1SMiao Xie } 1381600a45e1SMiao Xie 13824cb5300bSChris Mason pages[i] = page; 13834cb5300bSChris Mason i_done++; 13844cb5300bSChris Mason } 13854cb5300bSChris Mason if (!i_done || ret) 13864cb5300bSChris Mason goto out; 13874cb5300bSChris Mason 13881751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13894cb5300bSChris Mason goto out; 13904cb5300bSChris Mason 13914cb5300bSChris Mason /* 13924cb5300bSChris Mason * so now we have a nice long stream of locked 13934cb5300bSChris Mason * and up to date pages, lets wait on them 13944cb5300bSChris Mason */ 13954cb5300bSChris Mason for (i = 0; i < i_done; i++) 13964cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13974cb5300bSChris Mason 13984cb5300bSChris Mason page_start = page_offset(pages[0]); 139909cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 14004cb5300bSChris Mason 14014cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1402ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 14037f458a38SFilipe Manana 14047f458a38SFilipe Manana /* 14057f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 14067f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 14077f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 14087f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 14097f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 14107f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 14117f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 14127f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 14137f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 14147f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 14157f458a38SFilipe Manana * out if that happened. 14167f458a38SFilipe Manana */ 14177f458a38SFilipe Manana search_start = page_start; 14187f458a38SFilipe Manana while (search_start < page_end) { 14197f458a38SFilipe Manana struct extent_map *em; 14207f458a38SFilipe Manana 14217f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 14227f458a38SFilipe Manana page_end - search_start); 14237f458a38SFilipe Manana if (IS_ERR(em)) { 14247f458a38SFilipe Manana ret = PTR_ERR(em); 14257f458a38SFilipe Manana goto out_unlock_range; 14267f458a38SFilipe Manana } 14277f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 14287f458a38SFilipe Manana free_extent_map(em); 14297f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 14307f458a38SFilipe Manana ret = 0; 14317f458a38SFilipe Manana goto out_unlock_range; 14327f458a38SFilipe Manana } 14337f458a38SFilipe Manana search_start = extent_map_end(em); 14347f458a38SFilipe Manana free_extent_map(em); 14357f458a38SFilipe Manana } 14367f458a38SFilipe Manana 14374cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1438e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1439e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 14404cb5300bSChris Mason 14411f12bd06SLiu Bo if (i_done != page_cnt) { 14429e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 144328c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 14449e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 144586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1446a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 14474cb5300bSChris Mason } 14484cb5300bSChris Mason 14494cb5300bSChris Mason 14509e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1451018ed4f7SDavid Sterba &cached_state); 14524cb5300bSChris Mason 14534cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1454e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14554cb5300bSChris Mason 14564cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14574cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14584cb5300bSChris Mason ClearPageChecked(pages[i]); 14594cb5300bSChris Mason set_page_dirty(pages[i]); 14604cb5300bSChris Mason unlock_page(pages[i]); 146109cbfeafSKirill A. Shutemov put_page(pages[i]); 14624cb5300bSChris Mason } 14638702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1464364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14654cb5300bSChris Mason return i_done; 14667f458a38SFilipe Manana 14677f458a38SFilipe Manana out_unlock_range: 14687f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14697f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14704cb5300bSChris Mason out: 14714cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14724cb5300bSChris Mason unlock_page(pages[i]); 147309cbfeafSKirill A. Shutemov put_page(pages[i]); 14744cb5300bSChris Mason } 147586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1476a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14778702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1478364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14794cb5300bSChris Mason return ret; 14804cb5300bSChris Mason 14814cb5300bSChris Mason } 14824cb5300bSChris Mason 14834cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14844cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14854cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14864cb5300bSChris Mason { 14870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14884cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14894cb5300bSChris Mason struct file_ra_state *ra = NULL; 14904cb5300bSChris Mason unsigned long last_index; 1491151a31b2SLi Zefan u64 isize = i_size_read(inode); 1492940100a4SChris Mason u64 last_len = 0; 1493940100a4SChris Mason u64 skip = 0; 1494940100a4SChris Mason u64 defrag_end = 0; 14954cb5300bSChris Mason u64 newer_off = range->start; 1496f46b5a66SChristoph Hellwig unsigned long i; 1497008873eaSLi Zefan unsigned long ra_index = 0; 1498f46b5a66SChristoph Hellwig int ret; 14994cb5300bSChris Mason int defrag_count = 0; 15001a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1501aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 150209cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1503c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1504ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 15054cb5300bSChris Mason struct page **pages = NULL; 15061e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 15074cb5300bSChris Mason 15080abd5b17SLiu Bo if (isize == 0) 15090abd5b17SLiu Bo return 0; 15100abd5b17SLiu Bo 15110abd5b17SLiu Bo if (range->start >= isize) 15120abd5b17SLiu Bo return -EINVAL; 15131a419d85SLi Zefan 15141e2ef46dSDavid Sterba if (do_compress) { 1515ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 15161a419d85SLi Zefan return -EINVAL; 15171a419d85SLi Zefan if (range->compress_type) 15181a419d85SLi Zefan compress_type = range->compress_type; 15191a419d85SLi Zefan } 1520f46b5a66SChristoph Hellwig 15210abd5b17SLiu Bo if (extent_thresh == 0) 1522ee22184bSByongho Lee extent_thresh = SZ_256K; 1523f46b5a66SChristoph Hellwig 15244cb5300bSChris Mason /* 15250a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 15260a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 15270a52d108SDavid Sterba * we don't error out. 15284cb5300bSChris Mason */ 15294cb5300bSChris Mason if (!file) { 153063e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 15310a52d108SDavid Sterba if (ra) 15324cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 15334cb5300bSChris Mason } else { 15344cb5300bSChris Mason ra = &file->f_ra; 15354cb5300bSChris Mason } 15364cb5300bSChris Mason 153763e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 15384cb5300bSChris Mason if (!pages) { 15394cb5300bSChris Mason ret = -ENOMEM; 15404cb5300bSChris Mason goto out_ra; 15414cb5300bSChris Mason } 15424cb5300bSChris Mason 15434cb5300bSChris Mason /* find the last page to defrag */ 15441e701a32SChris Mason if (range->start + range->len > range->start) { 1545151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 154609cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 15471e701a32SChris Mason } else { 154809cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 15491e701a32SChris Mason } 15501e701a32SChris Mason 15514cb5300bSChris Mason if (newer_than) { 15524cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1553ee22184bSByongho Lee &newer_off, SZ_64K); 15544cb5300bSChris Mason if (!ret) { 15554cb5300bSChris Mason range->start = newer_off; 15564cb5300bSChris Mason /* 15574cb5300bSChris Mason * we always align our defrag to help keep 15584cb5300bSChris Mason * the extents in the file evenly spaced 15594cb5300bSChris Mason */ 156009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15614cb5300bSChris Mason } else 15624cb5300bSChris Mason goto out_ra; 15634cb5300bSChris Mason } else { 156409cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 15654cb5300bSChris Mason } 15664cb5300bSChris Mason if (!max_to_defrag) 1567070034bdSchandan max_to_defrag = last_index - i + 1; 15684cb5300bSChris Mason 15692a0f7f57SLi Zefan /* 15702a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 15712a0f7f57SLi Zefan * written sequentially. 15722a0f7f57SLi Zefan */ 15732a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 15742a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 15752a0f7f57SLi Zefan 1576f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 157709cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15784cb5300bSChris Mason /* 15794cb5300bSChris Mason * make sure we stop running if someone unmounts 15804cb5300bSChris Mason * the FS 15814cb5300bSChris Mason */ 15821751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15834cb5300bSChris Mason break; 15844cb5300bSChris Mason 15850b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15860b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1587210549ebSDavid Sterba ret = -EAGAIN; 1588210549ebSDavid Sterba break; 1589210549ebSDavid Sterba } 1590210549ebSDavid Sterba 159109cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15926c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15931e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1594940100a4SChris Mason unsigned long next; 1595940100a4SChris Mason /* 1596940100a4SChris Mason * the should_defrag function tells us how much to skip 1597940100a4SChris Mason * bump our counter by the suggested amount 1598940100a4SChris Mason */ 159909cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1600940100a4SChris Mason i = max(i + 1, next); 1601940100a4SChris Mason continue; 1602940100a4SChris Mason } 1603008873eaSLi Zefan 1604008873eaSLi Zefan if (!newer_than) { 160509cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 160609cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1607008873eaSLi Zefan cluster = min(cluster, max_cluster); 1608008873eaSLi Zefan } else { 1609008873eaSLi Zefan cluster = max_cluster; 1610008873eaSLi Zefan } 1611008873eaSLi Zefan 1612008873eaSLi Zefan if (i + cluster > ra_index) { 1613008873eaSLi Zefan ra_index = max(i, ra_index); 16140a52d108SDavid Sterba if (ra) 1615d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1616d3c0bab5SDavid Sterba file, ra_index, cluster); 1617e4826a5bSchandan ra_index += cluster; 1618008873eaSLi Zefan } 16194cb5300bSChris Mason 162064708539SJosef Bacik btrfs_inode_lock(inode, 0); 1621eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1622eede2bf3SOmar Sandoval ret = -ETXTBSY; 1623eede2bf3SOmar Sandoval } else { 16241e2ef46dSDavid Sterba if (do_compress) 1625eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1626008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1627eede2bf3SOmar Sandoval } 1628ecb8bea8SLiu Bo if (ret < 0) { 162964708539SJosef Bacik btrfs_inode_unlock(inode, 0); 16304cb5300bSChris Mason goto out_ra; 1631ecb8bea8SLiu Bo } 16324cb5300bSChris Mason 16334cb5300bSChris Mason defrag_count += ret; 1634d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 163564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 16364cb5300bSChris Mason 16374cb5300bSChris Mason if (newer_than) { 16384cb5300bSChris Mason if (newer_off == (u64)-1) 16394cb5300bSChris Mason break; 16404cb5300bSChris Mason 1641e1f041e1SLiu Bo if (ret > 0) 1642e1f041e1SLiu Bo i += ret; 1643e1f041e1SLiu Bo 16444cb5300bSChris Mason newer_off = max(newer_off + 1, 164509cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 16464cb5300bSChris Mason 1647ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1648ee22184bSByongho Lee &newer_off, SZ_64K); 16494cb5300bSChris Mason if (!ret) { 16504cb5300bSChris Mason range->start = newer_off; 165109cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16524cb5300bSChris Mason } else { 16534cb5300bSChris Mason break; 1654940100a4SChris Mason } 16554cb5300bSChris Mason } else { 1656008873eaSLi Zefan if (ret > 0) { 1657cbcc8326SLi Zefan i += ret; 165809cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1659008873eaSLi Zefan } else { 1660940100a4SChris Mason i++; 1661008873eaSLi Zefan last_len = 0; 1662008873eaSLi Zefan } 1663f46b5a66SChristoph Hellwig } 16644cb5300bSChris Mason } 1665f46b5a66SChristoph Hellwig 1666dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 16671e701a32SChris Mason filemap_flush(inode->i_mapping); 1668dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1669dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1670dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1671dec8ef90SFilipe Manana } 16721e701a32SChris Mason 16731a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 16740b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16755c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16765c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16771a419d85SLi Zefan } 16781a419d85SLi Zefan 167960ccf82fSDiego Calleja ret = defrag_count; 1680940100a4SChris Mason 16814cb5300bSChris Mason out_ra: 16821e2ef46dSDavid Sterba if (do_compress) { 168364708539SJosef Bacik btrfs_inode_lock(inode, 0); 1684eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 168564708539SJosef Bacik btrfs_inode_unlock(inode, 0); 1686633085c7SFilipe David Borba Manana } 16874cb5300bSChris Mason if (!file) 16884cb5300bSChris Mason kfree(ra); 16894cb5300bSChris Mason kfree(pages); 1690940100a4SChris Mason return ret; 1691f46b5a66SChristoph Hellwig } 1692f46b5a66SChristoph Hellwig 1693198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 169476dda93cSYan, Zheng void __user *arg) 1695f46b5a66SChristoph Hellwig { 16960b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16970b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1698f46b5a66SChristoph Hellwig u64 new_size; 1699f46b5a66SChristoph Hellwig u64 old_size; 1700f46b5a66SChristoph Hellwig u64 devid = 1; 17010b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1702f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1703f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1704f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1705f46b5a66SChristoph Hellwig char *sizestr; 17069a40f122SGui Hecheng char *retptr; 1707f46b5a66SChristoph Hellwig char *devstr = NULL; 1708f46b5a66SChristoph Hellwig int ret = 0; 1709f46b5a66SChristoph Hellwig int mod = 0; 1710f46b5a66SChristoph Hellwig 1711e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1712e441d54dSChris Mason return -EPERM; 1713e441d54dSChris Mason 1714198605a8SMiao Xie ret = mnt_want_write_file(file); 1715198605a8SMiao Xie if (ret) 1716198605a8SMiao Xie return ret; 1717198605a8SMiao Xie 1718c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 171997547676SMiao Xie mnt_drop_write_file(file); 1720e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1721c9e9f97bSIlya Dryomov } 1722c9e9f97bSIlya Dryomov 1723dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1724c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1725c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1726c9e9f97bSIlya Dryomov goto out; 1727c9e9f97bSIlya Dryomov } 17285516e595SMark Fasheh 17295516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1730f46b5a66SChristoph Hellwig 1731f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1732f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1733f46b5a66SChristoph Hellwig if (devstr) { 1734f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1735f46b5a66SChristoph Hellwig *devstr = '\0'; 1736f46b5a66SChristoph Hellwig devstr = vol_args->name; 173758dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 173858dfae63SZhangZhen if (ret) 173958dfae63SZhangZhen goto out_free; 1740dfd79829SMiao Xie if (!devid) { 1741dfd79829SMiao Xie ret = -EINVAL; 1742dfd79829SMiao Xie goto out_free; 1743dfd79829SMiao Xie } 17440b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1745f46b5a66SChristoph Hellwig } 1746dba60f3fSMiao Xie 1747b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1748f46b5a66SChristoph Hellwig if (!device) { 17490b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1750c1c9ff7cSGeert Uytterhoeven devid); 1751dfd79829SMiao Xie ret = -ENODEV; 1752c9e9f97bSIlya Dryomov goto out_free; 1753f46b5a66SChristoph Hellwig } 1754dba60f3fSMiao Xie 1755ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17560b246afaSJeff Mahoney btrfs_info(fs_info, 1757efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1758c1c9ff7cSGeert Uytterhoeven devid); 1759dfd79829SMiao Xie ret = -EPERM; 17604e42ae1bSLiu Bo goto out_free; 17614e42ae1bSLiu Bo } 17624e42ae1bSLiu Bo 1763f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1764f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1765f46b5a66SChristoph Hellwig else { 1766f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1767f46b5a66SChristoph Hellwig mod = -1; 1768f46b5a66SChristoph Hellwig sizestr++; 1769f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1770f46b5a66SChristoph Hellwig mod = 1; 1771f46b5a66SChristoph Hellwig sizestr++; 1772f46b5a66SChristoph Hellwig } 17739a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17749a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1775f46b5a66SChristoph Hellwig ret = -EINVAL; 1776c9e9f97bSIlya Dryomov goto out_free; 1777f46b5a66SChristoph Hellwig } 1778f46b5a66SChristoph Hellwig } 1779f46b5a66SChristoph Hellwig 1780401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1781dfd79829SMiao Xie ret = -EPERM; 178263a212abSStefan Behrens goto out_free; 178363a212abSStefan Behrens } 178463a212abSStefan Behrens 17857cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1786f46b5a66SChristoph Hellwig 1787f46b5a66SChristoph Hellwig if (mod < 0) { 1788f46b5a66SChristoph Hellwig if (new_size > old_size) { 1789f46b5a66SChristoph Hellwig ret = -EINVAL; 1790c9e9f97bSIlya Dryomov goto out_free; 1791f46b5a66SChristoph Hellwig } 1792f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1793f46b5a66SChristoph Hellwig } else if (mod > 0) { 1794eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1795902c68a4SGui Hecheng ret = -ERANGE; 1796eb8052e0SWenliang Fan goto out_free; 1797eb8052e0SWenliang Fan } 1798f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1799f46b5a66SChristoph Hellwig } 1800f46b5a66SChristoph Hellwig 1801ee22184bSByongho Lee if (new_size < SZ_256M) { 1802f46b5a66SChristoph Hellwig ret = -EINVAL; 1803c9e9f97bSIlya Dryomov goto out_free; 1804f46b5a66SChristoph Hellwig } 1805f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1806f46b5a66SChristoph Hellwig ret = -EFBIG; 1807c9e9f97bSIlya Dryomov goto out_free; 1808f46b5a66SChristoph Hellwig } 1809f46b5a66SChristoph Hellwig 181047f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1811f46b5a66SChristoph Hellwig 1812f46b5a66SChristoph Hellwig if (new_size > old_size) { 1813a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 181498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 181598d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1816c9e9f97bSIlya Dryomov goto out_free; 181798d5dc13STsutomu Itoh } 1818f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 18193a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1820ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1821f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 18220253f40eSjeff.liu } /* equal, nothing need to do */ 1823f46b5a66SChristoph Hellwig 1824faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1825faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1826faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1827faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1828faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1829c9e9f97bSIlya Dryomov out_free: 1830f46b5a66SChristoph Hellwig kfree(vol_args); 1831c9e9f97bSIlya Dryomov out: 1832c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 183318f39c41SIlya Dryomov mnt_drop_write_file(file); 1834f46b5a66SChristoph Hellwig return ret; 1835f46b5a66SChristoph Hellwig } 1836f46b5a66SChristoph Hellwig 18375d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 183852f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18395d54c67eSNikolay Borisov bool readonly, 18408696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1841f46b5a66SChristoph Hellwig { 1842f46b5a66SChristoph Hellwig int namelen; 18433de4586cSChris Mason int ret = 0; 1844f46b5a66SChristoph Hellwig 1845325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1846325c50e3SJeff Mahoney return -ENOTDIR; 1847325c50e3SJeff Mahoney 1848a874a63eSLiu Bo ret = mnt_want_write_file(file); 1849a874a63eSLiu Bo if (ret) 1850a874a63eSLiu Bo goto out; 1851a874a63eSLiu Bo 185272fd032eSSage Weil namelen = strlen(name); 185372fd032eSSage Weil if (strchr(name, '/')) { 1854f46b5a66SChristoph Hellwig ret = -EINVAL; 1855a874a63eSLiu Bo goto out_drop_write; 1856f46b5a66SChristoph Hellwig } 1857f46b5a66SChristoph Hellwig 185816780cabSChris Mason if (name[0] == '.' && 185916780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 186016780cabSChris Mason ret = -EEXIST; 1861a874a63eSLiu Bo goto out_drop_write; 186216780cabSChris Mason } 186316780cabSChris Mason 18643de4586cSChris Mason if (subvol) { 186572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18665d54c67eSNikolay Borisov NULL, readonly, inherit); 1867cb8e7090SChristoph Hellwig } else { 18682903ff01SAl Viro struct fd src = fdget(fd); 18693de4586cSChris Mason struct inode *src_inode; 18702903ff01SAl Viro if (!src.file) { 18713de4586cSChris Mason ret = -EINVAL; 1872a874a63eSLiu Bo goto out_drop_write; 18733de4586cSChris Mason } 18743de4586cSChris Mason 1875496ad9aaSAl Viro src_inode = file_inode(src.file); 1876496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1877c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1878efe120a0SFrank Holton "Snapshot src from another FS"); 187923ad5b17SKusanagi Kouichi ret = -EXDEV; 188021cb47beSChristian Brauner } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) { 1881d0242061SDavid Sterba /* 1882d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1883d0242061SDavid Sterba * are limited to own subvolumes only 1884d0242061SDavid Sterba */ 1885d0242061SDavid Sterba ret = -EPERM; 1886ecd18815SAl Viro } else { 1887c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 188872fd032eSSage Weil BTRFS_I(src_inode)->root, 18895d54c67eSNikolay Borisov readonly, inherit); 1890ecd18815SAl Viro } 18912903ff01SAl Viro fdput(src); 1892cb8e7090SChristoph Hellwig } 1893a874a63eSLiu Bo out_drop_write: 1894a874a63eSLiu Bo mnt_drop_write_file(file); 1895f46b5a66SChristoph Hellwig out: 189672fd032eSSage Weil return ret; 189772fd032eSSage Weil } 189872fd032eSSage Weil 189972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1900fa0d2b9bSLi Zefan void __user *arg, int subvol) 190172fd032eSSage Weil { 1902fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 190372fd032eSSage Weil int ret; 190472fd032eSSage Weil 1905325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1906325c50e3SJeff Mahoney return -ENOTDIR; 1907325c50e3SJeff Mahoney 1908fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1909fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1910fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1911fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1912fa0d2b9bSLi Zefan 19135d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19145d54c67eSNikolay Borisov subvol, false, NULL); 1915fa0d2b9bSLi Zefan 1916fa0d2b9bSLi Zefan kfree(vol_args); 1917fa0d2b9bSLi Zefan return ret; 1918fa0d2b9bSLi Zefan } 1919fa0d2b9bSLi Zefan 1920fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1921fa0d2b9bSLi Zefan void __user *arg, int subvol) 1922fa0d2b9bSLi Zefan { 1923fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1924fa0d2b9bSLi Zefan int ret; 1925b83cc969SLi Zefan bool readonly = false; 19266f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 192772fd032eSSage Weil 1928325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1929325c50e3SJeff Mahoney return -ENOTDIR; 1930325c50e3SJeff Mahoney 1931fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1932fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1933fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1934fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1935fdfb1e4fSLi Zefan 1936673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1937b83cc969SLi Zefan ret = -EOPNOTSUPP; 1938c47ca32dSDan Carpenter goto free_args; 1939fdfb1e4fSLi Zefan } 1940fdfb1e4fSLi Zefan 1941b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1942b83cc969SLi Zefan readonly = true; 19436f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 19445011c5a6SDan Carpenter u64 nums; 19455011c5a6SDan Carpenter 19465011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 19475011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 19486f72c7e2SArne Jansen ret = -EINVAL; 1949c47ca32dSDan Carpenter goto free_args; 19506f72c7e2SArne Jansen } 19516f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19526f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19536f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1954c47ca32dSDan Carpenter goto free_args; 19556f72c7e2SArne Jansen } 19565011c5a6SDan Carpenter 19575011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 19585011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 19595011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 19605011c5a6SDan Carpenter ret = -EINVAL; 19615011c5a6SDan Carpenter goto free_inherit; 19625011c5a6SDan Carpenter } 19635011c5a6SDan Carpenter 19645011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 19655011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 19665011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 19675011c5a6SDan Carpenter ret = -EINVAL; 19685011c5a6SDan Carpenter goto free_inherit; 19695011c5a6SDan Carpenter } 19706f72c7e2SArne Jansen } 197175eaa0e2SSage Weil 19725d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19735d54c67eSNikolay Borisov subvol, readonly, inherit); 1974c47ca32dSDan Carpenter if (ret) 1975c47ca32dSDan Carpenter goto free_inherit; 1976c47ca32dSDan Carpenter free_inherit: 19776f72c7e2SArne Jansen kfree(inherit); 1978c47ca32dSDan Carpenter free_args: 1979c47ca32dSDan Carpenter kfree(vol_args); 1980f46b5a66SChristoph Hellwig return ret; 1981f46b5a66SChristoph Hellwig } 1982f46b5a66SChristoph Hellwig 19830caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19840caa102dSLi Zefan void __user *arg) 19850caa102dSLi Zefan { 1986496ad9aaSAl Viro struct inode *inode = file_inode(file); 19870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19880caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19890caa102dSLi Zefan int ret = 0; 19900caa102dSLi Zefan u64 flags = 0; 19910caa102dSLi Zefan 19924a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19930caa102dSLi Zefan return -EINVAL; 19940caa102dSLi Zefan 19950b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19960caa102dSLi Zefan if (btrfs_root_readonly(root)) 19970caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19980b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19990caa102dSLi Zefan 20000caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 20010caa102dSLi Zefan ret = -EFAULT; 20020caa102dSLi Zefan 20030caa102dSLi Zefan return ret; 20040caa102dSLi Zefan } 20050caa102dSLi Zefan 20060caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 20070caa102dSLi Zefan void __user *arg) 20080caa102dSLi Zefan { 2009496ad9aaSAl Viro struct inode *inode = file_inode(file); 20100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 20110caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 20120caa102dSLi Zefan struct btrfs_trans_handle *trans; 20130caa102dSLi Zefan u64 root_flags; 20140caa102dSLi Zefan u64 flags; 20150caa102dSLi Zefan int ret = 0; 20160caa102dSLi Zefan 201721cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 2018bd60ea0fSDavid Sterba return -EPERM; 2019bd60ea0fSDavid Sterba 2020b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2021b9ca0664SLiu Bo if (ret) 2022b9ca0664SLiu Bo goto out; 20230caa102dSLi Zefan 20244a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2025b9ca0664SLiu Bo ret = -EINVAL; 2026b9ca0664SLiu Bo goto out_drop_write; 2027b9ca0664SLiu Bo } 20280caa102dSLi Zefan 2029b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2030b9ca0664SLiu Bo ret = -EFAULT; 2031b9ca0664SLiu Bo goto out_drop_write; 2032b9ca0664SLiu Bo } 20330caa102dSLi Zefan 2034b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2035b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2036b9ca0664SLiu Bo goto out_drop_write; 2037b9ca0664SLiu Bo } 20380caa102dSLi Zefan 20390b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20400caa102dSLi Zefan 20410caa102dSLi Zefan /* nothing to do */ 20420caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2043b9ca0664SLiu Bo goto out_drop_sem; 20440caa102dSLi Zefan 20450caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20462c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20470caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20480caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20492c686537SDavid Sterba } else { 20502c686537SDavid Sterba /* 20512c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20522c686537SDavid Sterba * send 20532c686537SDavid Sterba */ 20542c686537SDavid Sterba spin_lock(&root->root_item_lock); 20552c686537SDavid Sterba if (root->send_in_progress == 0) { 20560caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20570caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20582c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20592c686537SDavid Sterba } else { 20602c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20610b246afaSJeff Mahoney btrfs_warn(fs_info, 20622c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20632c686537SDavid Sterba root->root_key.objectid); 20642c686537SDavid Sterba ret = -EPERM; 20652c686537SDavid Sterba goto out_drop_sem; 20662c686537SDavid Sterba } 20672c686537SDavid Sterba } 20680caa102dSLi Zefan 20690caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20700caa102dSLi Zefan if (IS_ERR(trans)) { 20710caa102dSLi Zefan ret = PTR_ERR(trans); 20720caa102dSLi Zefan goto out_reset; 20730caa102dSLi Zefan } 20740caa102dSLi Zefan 20750b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20760caa102dSLi Zefan &root->root_key, &root->root_item); 20779417ebc8SNikolay Borisov if (ret < 0) { 20789417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20799417ebc8SNikolay Borisov goto out_reset; 20809417ebc8SNikolay Borisov } 20810caa102dSLi Zefan 20829417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20839417ebc8SNikolay Borisov 20840caa102dSLi Zefan out_reset: 20850caa102dSLi Zefan if (ret) 20860caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2087b9ca0664SLiu Bo out_drop_sem: 20880b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2089b9ca0664SLiu Bo out_drop_write: 2090b9ca0664SLiu Bo mnt_drop_write_file(file); 2091b9ca0664SLiu Bo out: 20920caa102dSLi Zefan return ret; 20930caa102dSLi Zefan } 20940caa102dSLi Zefan 2095ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2096ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2097ac8e9819SChris Mason { 2098abc6e134SChris Mason struct btrfs_key test; 2099abc6e134SChris Mason int ret; 2100abc6e134SChris Mason 2101abc6e134SChris Mason test.objectid = sk->min_objectid; 2102abc6e134SChris Mason test.type = sk->min_type; 2103abc6e134SChris Mason test.offset = sk->min_offset; 2104abc6e134SChris Mason 2105abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2106abc6e134SChris Mason if (ret < 0) 2107ac8e9819SChris Mason return 0; 2108abc6e134SChris Mason 2109abc6e134SChris Mason test.objectid = sk->max_objectid; 2110abc6e134SChris Mason test.type = sk->max_type; 2111abc6e134SChris Mason test.offset = sk->max_offset; 2112abc6e134SChris Mason 2113abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2114abc6e134SChris Mason if (ret > 0) 2115ac8e9819SChris Mason return 0; 2116ac8e9819SChris Mason return 1; 2117ac8e9819SChris Mason } 2118ac8e9819SChris Mason 2119df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2120ac8e9819SChris Mason struct btrfs_key *key, 2121ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 21229b6e817dSGerhard Heift size_t *buf_size, 2123ba346b35SGerhard Heift char __user *ubuf, 2124ac8e9819SChris Mason unsigned long *sk_offset, 2125ac8e9819SChris Mason int *num_found) 2126ac8e9819SChris Mason { 2127ac8e9819SChris Mason u64 found_transid; 2128ac8e9819SChris Mason struct extent_buffer *leaf; 2129ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2130dd81d459SNaohiro Aota struct btrfs_key test; 2131ac8e9819SChris Mason unsigned long item_off; 2132ac8e9819SChris Mason unsigned long item_len; 2133ac8e9819SChris Mason int nritems; 2134ac8e9819SChris Mason int i; 2135ac8e9819SChris Mason int slot; 2136ac8e9819SChris Mason int ret = 0; 2137ac8e9819SChris Mason 2138ac8e9819SChris Mason leaf = path->nodes[0]; 2139ac8e9819SChris Mason slot = path->slots[0]; 2140ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2141ac8e9819SChris Mason 2142ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2143ac8e9819SChris Mason i = nritems; 2144ac8e9819SChris Mason goto advance_key; 2145ac8e9819SChris Mason } 2146ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2147ac8e9819SChris Mason 2148ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2149ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2150ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2151ac8e9819SChris Mason 215203b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 215303b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 215403b71c6cSGabriel de Perthuis continue; 215503b71c6cSGabriel de Perthuis 21569b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21578f5f6178SGerhard Heift if (*num_found) { 2158ac8e9819SChris Mason ret = 1; 21598f5f6178SGerhard Heift goto out; 21608f5f6178SGerhard Heift } 21618f5f6178SGerhard Heift 21628f5f6178SGerhard Heift /* 21638f5f6178SGerhard Heift * return one empty item back for v1, which does not 21648f5f6178SGerhard Heift * handle -EOVERFLOW 21658f5f6178SGerhard Heift */ 21668f5f6178SGerhard Heift 21679b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2168ac8e9819SChris Mason item_len = 0; 21698f5f6178SGerhard Heift ret = -EOVERFLOW; 21708f5f6178SGerhard Heift } 2171ac8e9819SChris Mason 21729b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2173ac8e9819SChris Mason ret = 1; 217425c9bc2eSGerhard Heift goto out; 2175ac8e9819SChris Mason } 2176ac8e9819SChris Mason 2177ac8e9819SChris Mason sh.objectid = key->objectid; 2178ac8e9819SChris Mason sh.offset = key->offset; 2179ac8e9819SChris Mason sh.type = key->type; 2180ac8e9819SChris Mason sh.len = item_len; 2181ac8e9819SChris Mason sh.transid = found_transid; 2182ac8e9819SChris Mason 2183a48b73ecSJosef Bacik /* 2184a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2185a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2186a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2187a48b73ecSJosef Bacik * properly this next time through 2188a48b73ecSJosef Bacik */ 2189a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2190a48b73ecSJosef Bacik ret = 0; 2191ba346b35SGerhard Heift goto out; 2192ba346b35SGerhard Heift } 2193ba346b35SGerhard Heift 2194ac8e9819SChris Mason *sk_offset += sizeof(sh); 2195ac8e9819SChris Mason 2196ac8e9819SChris Mason if (item_len) { 2197ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2198a48b73ecSJosef Bacik /* 2199a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2200a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2201a48b73ecSJosef Bacik */ 2202a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2203ba346b35SGerhard Heift item_off, item_len)) { 2204a48b73ecSJosef Bacik ret = 0; 2205a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2206ba346b35SGerhard Heift goto out; 2207ba346b35SGerhard Heift } 2208ba346b35SGerhard Heift 2209ac8e9819SChris Mason *sk_offset += item_len; 2210ac8e9819SChris Mason } 2211e2156867SHugo Mills (*num_found)++; 2212ac8e9819SChris Mason 22138f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 22148f5f6178SGerhard Heift goto out; 22158f5f6178SGerhard Heift 221625c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 221725c9bc2eSGerhard Heift ret = 1; 221825c9bc2eSGerhard Heift goto out; 221925c9bc2eSGerhard Heift } 2220ac8e9819SChris Mason } 2221ac8e9819SChris Mason advance_key: 2222ac8e9819SChris Mason ret = 0; 2223dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2224dd81d459SNaohiro Aota test.type = sk->max_type; 2225dd81d459SNaohiro Aota test.offset = sk->max_offset; 2226dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2227dd81d459SNaohiro Aota ret = 1; 2228dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2229abc6e134SChris Mason key->offset++; 2230dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2231abc6e134SChris Mason key->offset = 0; 2232abc6e134SChris Mason key->type++; 2233dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2234abc6e134SChris Mason key->offset = 0; 2235abc6e134SChris Mason key->type = 0; 2236abc6e134SChris Mason key->objectid++; 2237abc6e134SChris Mason } else 2238abc6e134SChris Mason ret = 1; 223925c9bc2eSGerhard Heift out: 2240ba346b35SGerhard Heift /* 2241ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2242ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2243ba346b35SGerhard Heift * * all items were found 2244ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2245ba346b35SGerhard Heift * leaf 2246ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2247ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2248ba346b35SGerhard Heift */ 2249ac8e9819SChris Mason return ret; 2250ac8e9819SChris Mason } 2251ac8e9819SChris Mason 2252ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 225312544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22549b6e817dSGerhard Heift size_t *buf_size, 2255ba346b35SGerhard Heift char __user *ubuf) 2256ac8e9819SChris Mason { 22570b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2258ac8e9819SChris Mason struct btrfs_root *root; 2259ac8e9819SChris Mason struct btrfs_key key; 2260ac8e9819SChris Mason struct btrfs_path *path; 2261ac8e9819SChris Mason int ret; 2262ac8e9819SChris Mason int num_found = 0; 2263ac8e9819SChris Mason unsigned long sk_offset = 0; 2264ac8e9819SChris Mason 22659b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22669b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 226712544442SGerhard Heift return -EOVERFLOW; 22689b6e817dSGerhard Heift } 226912544442SGerhard Heift 2270ac8e9819SChris Mason path = btrfs_alloc_path(); 2271ac8e9819SChris Mason if (!path) 2272ac8e9819SChris Mason return -ENOMEM; 2273ac8e9819SChris Mason 2274ac8e9819SChris Mason if (sk->tree_id == 0) { 2275ac8e9819SChris Mason /* search the root of the inode that was passed */ 227600246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2277ac8e9819SChris Mason } else { 227856e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2279ac8e9819SChris Mason if (IS_ERR(root)) { 2280ac8e9819SChris Mason btrfs_free_path(path); 2281ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2282ac8e9819SChris Mason } 2283ac8e9819SChris Mason } 2284ac8e9819SChris Mason 2285ac8e9819SChris Mason key.objectid = sk->min_objectid; 2286ac8e9819SChris Mason key.type = sk->min_type; 2287ac8e9819SChris Mason key.offset = sk->min_offset; 2288ac8e9819SChris Mason 2289ac8e9819SChris Mason while (1) { 22901c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22911c78544eSFilipe Manana *buf_size - sk_offset); 2292a48b73ecSJosef Bacik if (ret) 2293a48b73ecSJosef Bacik break; 2294a48b73ecSJosef Bacik 22956174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2296ac8e9819SChris Mason if (ret != 0) { 2297ac8e9819SChris Mason if (ret > 0) 2298ac8e9819SChris Mason ret = 0; 2299ac8e9819SChris Mason goto err; 2300ac8e9819SChris Mason } 2301df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2302ac8e9819SChris Mason &sk_offset, &num_found); 2303b3b4aa74SDavid Sterba btrfs_release_path(path); 230425c9bc2eSGerhard Heift if (ret) 2305ac8e9819SChris Mason break; 2306ac8e9819SChris Mason 2307ac8e9819SChris Mason } 23088f5f6178SGerhard Heift if (ret > 0) 2309ac8e9819SChris Mason ret = 0; 2310ac8e9819SChris Mason err: 2311ac8e9819SChris Mason sk->nr_items = num_found; 231200246528SJosef Bacik btrfs_put_root(root); 2313ac8e9819SChris Mason btrfs_free_path(path); 2314ac8e9819SChris Mason return ret; 2315ac8e9819SChris Mason } 2316ac8e9819SChris Mason 2317ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2318ac8e9819SChris Mason void __user *argp) 2319ac8e9819SChris Mason { 2320ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2321ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2322ac8e9819SChris Mason struct inode *inode; 2323ac8e9819SChris Mason int ret; 23249b6e817dSGerhard Heift size_t buf_size; 2325ac8e9819SChris Mason 2326ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2327ac8e9819SChris Mason return -EPERM; 2328ac8e9819SChris Mason 2329ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2330ac8e9819SChris Mason 2331ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2332ba346b35SGerhard Heift return -EFAULT; 2333ba346b35SGerhard Heift 2334ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2335ac8e9819SChris Mason 2336496ad9aaSAl Viro inode = file_inode(file); 2337ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23388f5f6178SGerhard Heift 23398f5f6178SGerhard Heift /* 23408f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23418f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23428f5f6178SGerhard Heift */ 23438f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23448f5f6178SGerhard Heift ret = 0; 23458f5f6178SGerhard Heift 2346ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2347ac8e9819SChris Mason ret = -EFAULT; 2348ac8e9819SChris Mason return ret; 2349ac8e9819SChris Mason } 2350ac8e9819SChris Mason 2351cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2352cc68a8a5SGerhard Heift void __user *argp) 2353cc68a8a5SGerhard Heift { 2354cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2355cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2356cc68a8a5SGerhard Heift struct inode *inode; 2357cc68a8a5SGerhard Heift int ret; 2358cc68a8a5SGerhard Heift size_t buf_size; 2359ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2360cc68a8a5SGerhard Heift 2361cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2362cc68a8a5SGerhard Heift return -EPERM; 2363cc68a8a5SGerhard Heift 2364cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2365cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2366cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2367cc68a8a5SGerhard Heift return -EFAULT; 2368cc68a8a5SGerhard Heift 2369cc68a8a5SGerhard Heift buf_size = args.buf_size; 2370cc68a8a5SGerhard Heift 2371cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2372cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2373cc68a8a5SGerhard Heift buf_size = buf_limit; 2374cc68a8a5SGerhard Heift 2375cc68a8a5SGerhard Heift inode = file_inode(file); 2376cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2377718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2378cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2379cc68a8a5SGerhard Heift ret = -EFAULT; 2380cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2381cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2382cc68a8a5SGerhard Heift ret = -EFAULT; 2383cc68a8a5SGerhard Heift 238476dda93cSYan, Zheng return ret; 238576dda93cSYan, Zheng } 238676dda93cSYan, Zheng 238798d377a0STARUISI Hiroaki /* 2388ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2389ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 239098d377a0STARUISI Hiroaki */ 239198d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 239298d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 239398d377a0STARUISI Hiroaki { 239498d377a0STARUISI Hiroaki struct btrfs_root *root; 239598d377a0STARUISI Hiroaki struct btrfs_key key; 2396ac8e9819SChris Mason char *ptr; 239798d377a0STARUISI Hiroaki int ret = -1; 239898d377a0STARUISI Hiroaki int slot; 239998d377a0STARUISI Hiroaki int len; 240098d377a0STARUISI Hiroaki int total_len = 0; 240198d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 240298d377a0STARUISI Hiroaki struct extent_buffer *l; 240398d377a0STARUISI Hiroaki struct btrfs_path *path; 240498d377a0STARUISI Hiroaki 240598d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 240698d377a0STARUISI Hiroaki name[0]='\0'; 240798d377a0STARUISI Hiroaki return 0; 240898d377a0STARUISI Hiroaki } 240998d377a0STARUISI Hiroaki 241098d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 241198d377a0STARUISI Hiroaki if (!path) 241298d377a0STARUISI Hiroaki return -ENOMEM; 241398d377a0STARUISI Hiroaki 2414c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 241598d377a0STARUISI Hiroaki 241656e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 241798d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2418ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 241988234012SJosef Bacik root = NULL; 242088234012SJosef Bacik goto out; 242188234012SJosef Bacik } 242298d377a0STARUISI Hiroaki 242398d377a0STARUISI Hiroaki key.objectid = dirid; 242498d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 24258ad6fcabSChris Mason key.offset = (u64)-1; 242698d377a0STARUISI Hiroaki 242798d377a0STARUISI Hiroaki while (1) { 242898d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 242998d377a0STARUISI Hiroaki if (ret < 0) 243098d377a0STARUISI Hiroaki goto out; 243118674c6cSFilipe David Borba Manana else if (ret > 0) { 243218674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 243318674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 243418674c6cSFilipe David Borba Manana if (ret < 0) 243518674c6cSFilipe David Borba Manana goto out; 243618674c6cSFilipe David Borba Manana else if (ret > 0) { 2437ac8e9819SChris Mason ret = -ENOENT; 243898d377a0STARUISI Hiroaki goto out; 2439ac8e9819SChris Mason } 244018674c6cSFilipe David Borba Manana } 244118674c6cSFilipe David Borba Manana 244218674c6cSFilipe David Borba Manana l = path->nodes[0]; 244318674c6cSFilipe David Borba Manana slot = path->slots[0]; 244418674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 244598d377a0STARUISI Hiroaki 244698d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 244798d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 244898d377a0STARUISI Hiroaki ptr -= len + 1; 244998d377a0STARUISI Hiroaki total_len += len + 1; 2450a696cf35SFilipe David Borba Manana if (ptr < name) { 2451a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 245298d377a0STARUISI Hiroaki goto out; 2453a696cf35SFilipe David Borba Manana } 245498d377a0STARUISI Hiroaki 245598d377a0STARUISI Hiroaki *(ptr + len) = '/'; 245698d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 245798d377a0STARUISI Hiroaki 245898d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 245998d377a0STARUISI Hiroaki break; 246098d377a0STARUISI Hiroaki 2461b3b4aa74SDavid Sterba btrfs_release_path(path); 246298d377a0STARUISI Hiroaki key.objectid = key.offset; 24638ad6fcabSChris Mason key.offset = (u64)-1; 246498d377a0STARUISI Hiroaki dirid = key.objectid; 246598d377a0STARUISI Hiroaki } 246677906a50SLi Zefan memmove(name, ptr, total_len); 246798d377a0STARUISI Hiroaki name[total_len] = '\0'; 246898d377a0STARUISI Hiroaki ret = 0; 246998d377a0STARUISI Hiroaki out: 247000246528SJosef Bacik btrfs_put_root(root); 247198d377a0STARUISI Hiroaki btrfs_free_path(path); 2472ac8e9819SChris Mason return ret; 2473ac8e9819SChris Mason } 2474ac8e9819SChris Mason 247523d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 247623d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 247723d0b79dSTomohiro Misono { 247823d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 247923d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 248023d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 248123d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 248223d0b79dSTomohiro Misono u64 dirid = args->dirid; 248323d0b79dSTomohiro Misono unsigned long item_off; 248423d0b79dSTomohiro Misono unsigned long item_len; 248523d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 248623d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2487b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 248823d0b79dSTomohiro Misono struct btrfs_path *path; 248923d0b79dSTomohiro Misono struct btrfs_key key, key2; 249023d0b79dSTomohiro Misono struct extent_buffer *leaf; 249123d0b79dSTomohiro Misono struct inode *temp_inode; 249223d0b79dSTomohiro Misono char *ptr; 249323d0b79dSTomohiro Misono int slot; 249423d0b79dSTomohiro Misono int len; 249523d0b79dSTomohiro Misono int total_len = 0; 249623d0b79dSTomohiro Misono int ret; 249723d0b79dSTomohiro Misono 249823d0b79dSTomohiro Misono path = btrfs_alloc_path(); 249923d0b79dSTomohiro Misono if (!path) 250023d0b79dSTomohiro Misono return -ENOMEM; 250123d0b79dSTomohiro Misono 250223d0b79dSTomohiro Misono /* 250323d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 250423d0b79dSTomohiro Misono * construct the path in from the bottom up. 250523d0b79dSTomohiro Misono */ 250623d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 250723d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 250823d0b79dSTomohiro Misono 250956e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 251023d0b79dSTomohiro Misono if (IS_ERR(root)) { 251123d0b79dSTomohiro Misono ret = PTR_ERR(root); 251223d0b79dSTomohiro Misono goto out; 251323d0b79dSTomohiro Misono } 251423d0b79dSTomohiro Misono 251523d0b79dSTomohiro Misono key.objectid = dirid; 251623d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 251723d0b79dSTomohiro Misono key.offset = (u64)-1; 251823d0b79dSTomohiro Misono while (1) { 251923d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 252023d0b79dSTomohiro Misono if (ret < 0) { 2521b8a49ae1SJosef Bacik goto out_put; 252223d0b79dSTomohiro Misono } else if (ret > 0) { 252323d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 252423d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 252523d0b79dSTomohiro Misono if (ret < 0) { 2526b8a49ae1SJosef Bacik goto out_put; 252723d0b79dSTomohiro Misono } else if (ret > 0) { 252823d0b79dSTomohiro Misono ret = -ENOENT; 2529b8a49ae1SJosef Bacik goto out_put; 253023d0b79dSTomohiro Misono } 253123d0b79dSTomohiro Misono } 253223d0b79dSTomohiro Misono 253323d0b79dSTomohiro Misono leaf = path->nodes[0]; 253423d0b79dSTomohiro Misono slot = path->slots[0]; 253523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 253623d0b79dSTomohiro Misono 253723d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 253823d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 253923d0b79dSTomohiro Misono ptr -= len + 1; 254023d0b79dSTomohiro Misono total_len += len + 1; 254123d0b79dSTomohiro Misono if (ptr < args->path) { 254223d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2543b8a49ae1SJosef Bacik goto out_put; 254423d0b79dSTomohiro Misono } 254523d0b79dSTomohiro Misono 254623d0b79dSTomohiro Misono *(ptr + len) = '/'; 254723d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 254823d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 254923d0b79dSTomohiro Misono 255023d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 255123d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 255223d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 255323d0b79dSTomohiro Misono if (ret < 0) { 2554b8a49ae1SJosef Bacik goto out_put; 255523d0b79dSTomohiro Misono } else if (ret > 0) { 255623d0b79dSTomohiro Misono ret = -ENOENT; 2557b8a49ae1SJosef Bacik goto out_put; 255823d0b79dSTomohiro Misono } 255923d0b79dSTomohiro Misono 256023d0b79dSTomohiro Misono leaf = path->nodes[0]; 256123d0b79dSTomohiro Misono slot = path->slots[0]; 256223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 256323d0b79dSTomohiro Misono if (key2.objectid != dirid) { 256423d0b79dSTomohiro Misono ret = -ENOENT; 2565b8a49ae1SJosef Bacik goto out_put; 256623d0b79dSTomohiro Misono } 256723d0b79dSTomohiro Misono 25680202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25693ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25703ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2571b8a49ae1SJosef Bacik goto out_put; 25723ca57bd6SMisono Tomohiro } 257347291baaSChristian Brauner ret = inode_permission(&init_user_ns, temp_inode, 257447291baaSChristian Brauner MAY_READ | MAY_EXEC); 257523d0b79dSTomohiro Misono iput(temp_inode); 257623d0b79dSTomohiro Misono if (ret) { 257723d0b79dSTomohiro Misono ret = -EACCES; 2578b8a49ae1SJosef Bacik goto out_put; 257923d0b79dSTomohiro Misono } 258023d0b79dSTomohiro Misono 258123d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 258223d0b79dSTomohiro Misono break; 258323d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 258423d0b79dSTomohiro Misono ret = -EACCES; 2585b8a49ae1SJosef Bacik goto out_put; 258623d0b79dSTomohiro Misono } 258723d0b79dSTomohiro Misono 258823d0b79dSTomohiro Misono btrfs_release_path(path); 258923d0b79dSTomohiro Misono key.objectid = key.offset; 259023d0b79dSTomohiro Misono key.offset = (u64)-1; 259123d0b79dSTomohiro Misono dirid = key.objectid; 259223d0b79dSTomohiro Misono } 259323d0b79dSTomohiro Misono 259423d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 259523d0b79dSTomohiro Misono args->path[total_len] = '\0'; 259600246528SJosef Bacik btrfs_put_root(root); 2597b8a49ae1SJosef Bacik root = NULL; 259823d0b79dSTomohiro Misono btrfs_release_path(path); 259923d0b79dSTomohiro Misono } 260023d0b79dSTomohiro Misono 260123d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 260223d0b79dSTomohiro Misono key.objectid = treeid; 260323d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 260423d0b79dSTomohiro Misono key.offset = args->treeid; 2605b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 260623d0b79dSTomohiro Misono if (ret < 0) { 260723d0b79dSTomohiro Misono goto out; 260823d0b79dSTomohiro Misono } else if (ret > 0) { 260923d0b79dSTomohiro Misono ret = -ENOENT; 261023d0b79dSTomohiro Misono goto out; 261123d0b79dSTomohiro Misono } 261223d0b79dSTomohiro Misono 261323d0b79dSTomohiro Misono leaf = path->nodes[0]; 261423d0b79dSTomohiro Misono slot = path->slots[0]; 261523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 261623d0b79dSTomohiro Misono 261723d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 261823d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 261923d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 262023d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 262123d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 262223d0b79dSTomohiro Misono ret = -EINVAL; 262323d0b79dSTomohiro Misono goto out; 262423d0b79dSTomohiro Misono } 262523d0b79dSTomohiro Misono 262623d0b79dSTomohiro Misono /* Copy subvolume's name */ 262723d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 262823d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 262923d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 263023d0b79dSTomohiro Misono args->name[item_len] = 0; 263123d0b79dSTomohiro Misono 2632b8a49ae1SJosef Bacik out_put: 263300246528SJosef Bacik btrfs_put_root(root); 263423d0b79dSTomohiro Misono out: 263523d0b79dSTomohiro Misono btrfs_free_path(path); 263623d0b79dSTomohiro Misono return ret; 263723d0b79dSTomohiro Misono } 263823d0b79dSTomohiro Misono 2639ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2640ac8e9819SChris Mason void __user *argp) 2641ac8e9819SChris Mason { 2642ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2643ac8e9819SChris Mason struct inode *inode; 264401b810b8SDavid Sterba int ret = 0; 2645ac8e9819SChris Mason 26462354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26472354d08fSJulia Lawall if (IS_ERR(args)) 26482354d08fSJulia Lawall return PTR_ERR(args); 2649c2b96929SDan Carpenter 2650496ad9aaSAl Viro inode = file_inode(file); 2651ac8e9819SChris Mason 265201b810b8SDavid Sterba /* 265301b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 265401b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 265501b810b8SDavid Sterba */ 26561b53ac4dSChris Mason if (args->treeid == 0) 26571b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26581b53ac4dSChris Mason 265901b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 266001b810b8SDavid Sterba args->name[0] = 0; 266101b810b8SDavid Sterba goto out; 266201b810b8SDavid Sterba } 266301b810b8SDavid Sterba 266401b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 266501b810b8SDavid Sterba ret = -EPERM; 266601b810b8SDavid Sterba goto out; 266701b810b8SDavid Sterba } 266801b810b8SDavid Sterba 2669ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2670ac8e9819SChris Mason args->treeid, args->objectid, 2671ac8e9819SChris Mason args->name); 2672ac8e9819SChris Mason 267301b810b8SDavid Sterba out: 2674ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2675ac8e9819SChris Mason ret = -EFAULT; 2676ac8e9819SChris Mason 2677ac8e9819SChris Mason kfree(args); 267898d377a0STARUISI Hiroaki return ret; 267998d377a0STARUISI Hiroaki } 268098d377a0STARUISI Hiroaki 268123d0b79dSTomohiro Misono /* 268223d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 268323d0b79dSTomohiro Misono * 268423d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 268523d0b79dSTomohiro Misono * 268623d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 268723d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 268823d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 268923d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 269023d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 269123d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 269223d0b79dSTomohiro Misono */ 269323d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 269423d0b79dSTomohiro Misono { 269523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 269623d0b79dSTomohiro Misono struct inode *inode; 269723d0b79dSTomohiro Misono int ret; 269823d0b79dSTomohiro Misono 269923d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 270023d0b79dSTomohiro Misono if (IS_ERR(args)) 270123d0b79dSTomohiro Misono return PTR_ERR(args); 270223d0b79dSTomohiro Misono 270323d0b79dSTomohiro Misono inode = file_inode(file); 270423d0b79dSTomohiro Misono 270523d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 270623d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 270723d0b79dSTomohiro Misono /* 270823d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 270923d0b79dSTomohiro Misono * called 271023d0b79dSTomohiro Misono */ 271123d0b79dSTomohiro Misono kfree(args); 271223d0b79dSTomohiro Misono return -EACCES; 271323d0b79dSTomohiro Misono } 271423d0b79dSTomohiro Misono 271523d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 271623d0b79dSTomohiro Misono 271723d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 271823d0b79dSTomohiro Misono ret = -EFAULT; 271923d0b79dSTomohiro Misono 272023d0b79dSTomohiro Misono kfree(args); 272123d0b79dSTomohiro Misono return ret; 272223d0b79dSTomohiro Misono } 272323d0b79dSTomohiro Misono 2724b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2725b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2726b64ec075STomohiro Misono { 2727b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2728b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2729b64ec075STomohiro Misono struct btrfs_root *root; 2730b64ec075STomohiro Misono struct btrfs_path *path; 2731b64ec075STomohiro Misono struct btrfs_key key; 2732b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2733b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2734b64ec075STomohiro Misono struct extent_buffer *leaf; 2735b64ec075STomohiro Misono unsigned long item_off; 2736b64ec075STomohiro Misono unsigned long item_len; 2737b64ec075STomohiro Misono struct inode *inode; 2738b64ec075STomohiro Misono int slot; 2739b64ec075STomohiro Misono int ret = 0; 2740b64ec075STomohiro Misono 2741b64ec075STomohiro Misono path = btrfs_alloc_path(); 2742b64ec075STomohiro Misono if (!path) 2743b64ec075STomohiro Misono return -ENOMEM; 2744b64ec075STomohiro Misono 2745b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2746b64ec075STomohiro Misono if (!subvol_info) { 2747b64ec075STomohiro Misono btrfs_free_path(path); 2748b64ec075STomohiro Misono return -ENOMEM; 2749b64ec075STomohiro Misono } 2750b64ec075STomohiro Misono 2751b64ec075STomohiro Misono inode = file_inode(file); 2752b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2753b64ec075STomohiro Misono 2754b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2755b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 275656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2757b64ec075STomohiro Misono if (IS_ERR(root)) { 2758b64ec075STomohiro Misono ret = PTR_ERR(root); 275904734e84SJosef Bacik goto out_free; 276004734e84SJosef Bacik } 2761b64ec075STomohiro Misono root_item = &root->root_item; 2762b64ec075STomohiro Misono 2763b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2764b64ec075STomohiro Misono 2765b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2766b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2767b64ec075STomohiro Misono 2768b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2769b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2770b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2771b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2772b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2773b64ec075STomohiro Misono 2774b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2775b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2776b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2777b64ec075STomohiro Misono 2778b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2779b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2780b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2781b64ec075STomohiro Misono 2782b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2783b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2784b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2785b64ec075STomohiro Misono 2786b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2787b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2788b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2789b64ec075STomohiro Misono 2790b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2791b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2792b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2793b64ec075STomohiro Misono key.offset = 0; 279404734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2795b64ec075STomohiro Misono if (ret < 0) { 2796b64ec075STomohiro Misono goto out; 2797b64ec075STomohiro Misono } else if (path->slots[0] >= 2798b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 279904734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2800b64ec075STomohiro Misono if (ret < 0) { 2801b64ec075STomohiro Misono goto out; 2802b64ec075STomohiro Misono } else if (ret > 0) { 2803b64ec075STomohiro Misono ret = -EUCLEAN; 2804b64ec075STomohiro Misono goto out; 2805b64ec075STomohiro Misono } 2806b64ec075STomohiro Misono } 2807b64ec075STomohiro Misono 2808b64ec075STomohiro Misono leaf = path->nodes[0]; 2809b64ec075STomohiro Misono slot = path->slots[0]; 2810b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2811b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2812b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2813b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2814b64ec075STomohiro Misono 2815b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2816b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2817b64ec075STomohiro Misono 2818b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2819b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2820b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2821b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2822b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2823b64ec075STomohiro Misono item_off, item_len); 2824b64ec075STomohiro Misono } else { 2825b64ec075STomohiro Misono ret = -ENOENT; 2826b64ec075STomohiro Misono goto out; 2827b64ec075STomohiro Misono } 2828b64ec075STomohiro Misono } 2829b64ec075STomohiro Misono 2830b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2831b64ec075STomohiro Misono ret = -EFAULT; 2832b64ec075STomohiro Misono 2833b64ec075STomohiro Misono out: 283400246528SJosef Bacik btrfs_put_root(root); 283504734e84SJosef Bacik out_free: 2836b64ec075STomohiro Misono btrfs_free_path(path); 2837b091f7feSWaiman Long kfree(subvol_info); 2838b64ec075STomohiro Misono return ret; 2839b64ec075STomohiro Misono } 2840b64ec075STomohiro Misono 284142e4b520STomohiro Misono /* 284242e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 284342e4b520STomohiro Misono * except the subvolume name. 284442e4b520STomohiro Misono */ 284542e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 284642e4b520STomohiro Misono { 284742e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 284842e4b520STomohiro Misono struct btrfs_root_ref *rref; 284942e4b520STomohiro Misono struct btrfs_root *root; 285042e4b520STomohiro Misono struct btrfs_path *path; 285142e4b520STomohiro Misono struct btrfs_key key; 285242e4b520STomohiro Misono struct extent_buffer *leaf; 285342e4b520STomohiro Misono struct inode *inode; 285442e4b520STomohiro Misono u64 objectid; 285542e4b520STomohiro Misono int slot; 285642e4b520STomohiro Misono int ret; 285742e4b520STomohiro Misono u8 found; 285842e4b520STomohiro Misono 285942e4b520STomohiro Misono path = btrfs_alloc_path(); 286042e4b520STomohiro Misono if (!path) 286142e4b520STomohiro Misono return -ENOMEM; 286242e4b520STomohiro Misono 286342e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 286442e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 286542e4b520STomohiro Misono btrfs_free_path(path); 286642e4b520STomohiro Misono return PTR_ERR(rootrefs); 286742e4b520STomohiro Misono } 286842e4b520STomohiro Misono 286942e4b520STomohiro Misono inode = file_inode(file); 287042e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 287142e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 287242e4b520STomohiro Misono 287342e4b520STomohiro Misono key.objectid = objectid; 287442e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 287542e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 287642e4b520STomohiro Misono found = 0; 287742e4b520STomohiro Misono 287842e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 287942e4b520STomohiro Misono if (ret < 0) { 288042e4b520STomohiro Misono goto out; 288142e4b520STomohiro Misono } else if (path->slots[0] >= 288242e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 288342e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 288442e4b520STomohiro Misono if (ret < 0) { 288542e4b520STomohiro Misono goto out; 288642e4b520STomohiro Misono } else if (ret > 0) { 288742e4b520STomohiro Misono ret = -EUCLEAN; 288842e4b520STomohiro Misono goto out; 288942e4b520STomohiro Misono } 289042e4b520STomohiro Misono } 289142e4b520STomohiro Misono while (1) { 289242e4b520STomohiro Misono leaf = path->nodes[0]; 289342e4b520STomohiro Misono slot = path->slots[0]; 289442e4b520STomohiro Misono 289542e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 289642e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 289742e4b520STomohiro Misono ret = 0; 289842e4b520STomohiro Misono goto out; 289942e4b520STomohiro Misono } 290042e4b520STomohiro Misono 290142e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 290242e4b520STomohiro Misono ret = -EOVERFLOW; 290342e4b520STomohiro Misono goto out; 290442e4b520STomohiro Misono } 290542e4b520STomohiro Misono 290642e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 290742e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 290842e4b520STomohiro Misono rootrefs->rootref[found].dirid = 290942e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 291042e4b520STomohiro Misono found++; 291142e4b520STomohiro Misono 291242e4b520STomohiro Misono ret = btrfs_next_item(root, path); 291342e4b520STomohiro Misono if (ret < 0) { 291442e4b520STomohiro Misono goto out; 291542e4b520STomohiro Misono } else if (ret > 0) { 291642e4b520STomohiro Misono ret = -EUCLEAN; 291742e4b520STomohiro Misono goto out; 291842e4b520STomohiro Misono } 291942e4b520STomohiro Misono } 292042e4b520STomohiro Misono 292142e4b520STomohiro Misono out: 292242e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 292342e4b520STomohiro Misono rootrefs->num_items = found; 292442e4b520STomohiro Misono /* update min_treeid for next search */ 292542e4b520STomohiro Misono if (found) 292642e4b520STomohiro Misono rootrefs->min_treeid = 292742e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 292842e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 292942e4b520STomohiro Misono ret = -EFAULT; 293042e4b520STomohiro Misono } 293142e4b520STomohiro Misono 293242e4b520STomohiro Misono kfree(rootrefs); 293342e4b520STomohiro Misono btrfs_free_path(path); 293442e4b520STomohiro Misono 293542e4b520STomohiro Misono return ret; 293642e4b520STomohiro Misono } 293742e4b520STomohiro Misono 293876dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2939949964c9SMarcos Paulo de Souza void __user *arg, 2940949964c9SMarcos Paulo de Souza bool destroy_v2) 294176dda93cSYan, Zheng { 294254563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29430b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 294476dda93cSYan, Zheng struct dentry *dentry; 29452b0143b5SDavid Howells struct inode *dir = d_inode(parent); 294676dda93cSYan, Zheng struct inode *inode; 294776dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 294876dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2949949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2950949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2951949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2952949964c9SMarcos Paulo de Souza int subvol_namelen; 295376dda93cSYan, Zheng int err = 0; 2954949964c9SMarcos Paulo de Souza bool destroy_parent = false; 295576dda93cSYan, Zheng 2956949964c9SMarcos Paulo de Souza if (destroy_v2) { 2957949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2958949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2959949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2960325c50e3SJeff Mahoney 2961949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2962949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2963949964c9SMarcos Paulo de Souza goto out; 2964949964c9SMarcos Paulo de Souza } 296576dda93cSYan, Zheng 2966949964c9SMarcos Paulo de Souza /* 2967949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2968949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2969949964c9SMarcos Paulo de Souza */ 2970949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2971949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2972949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2973949964c9SMarcos Paulo de Souza 2974949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2975949964c9SMarcos Paulo de Souza if (err) 2976949964c9SMarcos Paulo de Souza goto out; 2977949964c9SMarcos Paulo de Souza } else { 2978949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 297976dda93cSYan, Zheng err = -EINVAL; 298076dda93cSYan, Zheng goto out; 298176dda93cSYan, Zheng } 298276dda93cSYan, Zheng 2983a561be71SAl Viro err = mnt_want_write_file(file); 298476dda93cSYan, Zheng if (err) 298576dda93cSYan, Zheng goto out; 298676dda93cSYan, Zheng 2987949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2988949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2989949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2990949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2991949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2992949964c9SMarcos Paulo de Souza goto out_drop_write; 2993949964c9SMarcos Paulo de Souza } 2994949964c9SMarcos Paulo de Souza 2995949964c9SMarcos Paulo de Souza /* 2996949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2997949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2998949964c9SMarcos Paulo de Souza */ 2999949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 3000949964c9SMarcos Paulo de Souza 3001949964c9SMarcos Paulo de Souza /* 3002949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 3003949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 3004949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 3005949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 3006949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3007949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3008949964c9SMarcos Paulo de Souza */ 3009949964c9SMarcos Paulo de Souza dput(dentry); 3010949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3011949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3012949964c9SMarcos Paulo de Souza goto out_drop_write; 3013949964c9SMarcos Paulo de Souza } 3014949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3015949964c9SMarcos Paulo de Souza 3016949964c9SMarcos Paulo de Souza /* 3017949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3018949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3019949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3020949964c9SMarcos Paulo de Souza * new parent dentry. 3021949964c9SMarcos Paulo de Souza */ 3022949964c9SMarcos Paulo de Souza destroy_parent = true; 3023949964c9SMarcos Paulo de Souza 3024949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3025949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3026949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3027949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3028949964c9SMarcos Paulo de Souza goto free_parent; 3029949964c9SMarcos Paulo de Souza } 3030949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 3031949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3032949964c9SMarcos Paulo de Souza } 3033949964c9SMarcos Paulo de Souza } else { 3034949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3035949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3036949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3037949964c9SMarcos Paulo de Souza 3038949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3039949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3040949964c9SMarcos Paulo de Souza 3041949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3042949964c9SMarcos Paulo de Souza if (err) 3043949964c9SMarcos Paulo de Souza goto out; 3044949964c9SMarcos Paulo de Souza } 3045949964c9SMarcos Paulo de Souza 3046949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3047949964c9SMarcos Paulo de Souza 3048949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3049949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3050949964c9SMarcos Paulo de Souza err = -EINVAL; 3051949964c9SMarcos Paulo de Souza goto free_subvol_name; 3052949964c9SMarcos Paulo de Souza } 3053949964c9SMarcos Paulo de Souza 3054949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3055949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3056949964c9SMarcos Paulo de Souza goto free_subvol_name; 3057949964c9SMarcos Paulo de Souza } 3058521e0546SDavid Sterba 305900235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 306000235411SAl Viro if (err == -EINTR) 3061949964c9SMarcos Paulo de Souza goto free_subvol_name; 3062949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 306376dda93cSYan, Zheng if (IS_ERR(dentry)) { 306476dda93cSYan, Zheng err = PTR_ERR(dentry); 306576dda93cSYan, Zheng goto out_unlock_dir; 306676dda93cSYan, Zheng } 306776dda93cSYan, Zheng 30682b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 306976dda93cSYan, Zheng err = -ENOENT; 307076dda93cSYan, Zheng goto out_dput; 307176dda93cSYan, Zheng } 307276dda93cSYan, Zheng 30732b0143b5SDavid Howells inode = d_inode(dentry); 30744260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30754260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30764260f7c7SSage Weil /* 30774260f7c7SSage Weil * Regular user. Only allow this with a special mount 30784260f7c7SSage Weil * option, when the user has write+exec access to the 30794260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30804260f7c7SSage Weil * allowed. 30814260f7c7SSage Weil * 30824260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30834260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30844260f7c7SSage Weil * otherwise be able to delete. 30854260f7c7SSage Weil * 30864260f7c7SSage Weil * Users who want to delete empty subvols should try 30874260f7c7SSage Weil * rmdir(2). 30884260f7c7SSage Weil */ 30894260f7c7SSage Weil err = -EPERM; 30900b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30914260f7c7SSage Weil goto out_dput; 30924260f7c7SSage Weil 30934260f7c7SSage Weil /* 30944260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30954260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30964260f7c7SSage Weil * must be called on the dentry referencing the root 30974260f7c7SSage Weil * of the subvol, not a random directory contained 30984260f7c7SSage Weil * within it. 30994260f7c7SSage Weil */ 31004260f7c7SSage Weil err = -EINVAL; 31014260f7c7SSage Weil if (root == dest) 31024260f7c7SSage Weil goto out_dput; 31034260f7c7SSage Weil 310447291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, 310547291baaSChristian Brauner MAY_WRITE | MAY_EXEC); 31064260f7c7SSage Weil if (err) 31074260f7c7SSage Weil goto out_dput; 31085c39da5bSMiao Xie } 31094260f7c7SSage Weil 31105c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 31114260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 31124260f7c7SSage Weil if (err) 31134260f7c7SSage Weil goto out_dput; 31144260f7c7SSage Weil 31154a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 311676dda93cSYan, Zheng err = -EINVAL; 311776dda93cSYan, Zheng goto out_dput; 311876dda93cSYan, Zheng } 311976dda93cSYan, Zheng 312064708539SJosef Bacik btrfs_inode_lock(inode, 0); 3121f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 312264708539SJosef Bacik btrfs_inode_unlock(inode, 0); 312346008d9dSAmir Goldstein if (!err) { 312446008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 312576dda93cSYan, Zheng d_delete(dentry); 312646008d9dSAmir Goldstein } 3127fa6ac876SLiu Bo 312876dda93cSYan, Zheng out_dput: 312976dda93cSYan, Zheng dput(dentry); 313076dda93cSYan, Zheng out_unlock_dir: 313164708539SJosef Bacik btrfs_inode_unlock(dir, 0); 3132949964c9SMarcos Paulo de Souza free_subvol_name: 3133949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3134949964c9SMarcos Paulo de Souza free_parent: 3135949964c9SMarcos Paulo de Souza if (destroy_parent) 3136949964c9SMarcos Paulo de Souza dput(parent); 313700235411SAl Viro out_drop_write: 31382a79f17eSAl Viro mnt_drop_write_file(file); 313976dda93cSYan, Zheng out: 3140949964c9SMarcos Paulo de Souza kfree(vol_args2); 314176dda93cSYan, Zheng kfree(vol_args); 314276dda93cSYan, Zheng return err; 314376dda93cSYan, Zheng } 314476dda93cSYan, Zheng 31451e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3146f46b5a66SChristoph Hellwig { 3147496ad9aaSAl Viro struct inode *inode = file_inode(file); 3148f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31491e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3150c146afadSYan Zheng int ret; 3151c146afadSYan Zheng 315225122d15SIlya Dryomov ret = mnt_want_write_file(file); 315325122d15SIlya Dryomov if (ret) 315425122d15SIlya Dryomov return ret; 3155b83cc969SLi Zefan 315625122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 315725122d15SIlya Dryomov ret = -EROFS; 315825122d15SIlya Dryomov goto out; 31595ac00addSStefan Behrens } 3160f46b5a66SChristoph Hellwig 3161f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3162f46b5a66SChristoph Hellwig case S_IFDIR: 3163e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3164e441d54dSChris Mason ret = -EPERM; 3165e441d54dSChris Mason goto out; 3166e441d54dSChris Mason } 3167de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3168f46b5a66SChristoph Hellwig break; 3169f46b5a66SChristoph Hellwig case S_IFREG: 3170616d374eSAdam Borowski /* 3171616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3172616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3173616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3174616d374eSAdam Borowski */ 3175616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 317647291baaSChristian Brauner inode_permission(&init_user_ns, inode, MAY_WRITE)) { 3177616d374eSAdam Borowski ret = -EPERM; 3178e441d54dSChris Mason goto out; 3179e441d54dSChris Mason } 31801e701a32SChris Mason 31811e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31821e701a32SChris Mason if (!range) { 31831e701a32SChris Mason ret = -ENOMEM; 31841e701a32SChris Mason goto out; 31851e701a32SChris Mason } 31861e701a32SChris Mason 31871e701a32SChris Mason if (argp) { 31881e701a32SChris Mason if (copy_from_user(range, argp, 31891e701a32SChris Mason sizeof(*range))) { 31901e701a32SChris Mason ret = -EFAULT; 31911e701a32SChris Mason kfree(range); 3192683be16eSDan Carpenter goto out; 31931e701a32SChris Mason } 31941e701a32SChris Mason /* compression requires us to start the IO */ 31951e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31961e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31971e701a32SChris Mason range->extent_thresh = (u32)-1; 31981e701a32SChris Mason } 31991e701a32SChris Mason } else { 32001e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 32011e701a32SChris Mason range->len = (u64)-1; 32021e701a32SChris Mason } 3203496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 32047c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 32054cb5300bSChris Mason if (ret > 0) 32064cb5300bSChris Mason ret = 0; 32071e701a32SChris Mason kfree(range); 3208f46b5a66SChristoph Hellwig break; 32098929ecfaSYan, Zheng default: 32108929ecfaSYan, Zheng ret = -EINVAL; 3211f46b5a66SChristoph Hellwig } 3212e441d54dSChris Mason out: 321325122d15SIlya Dryomov mnt_drop_write_file(file); 3214e441d54dSChris Mason return ret; 3215f46b5a66SChristoph Hellwig } 3216f46b5a66SChristoph Hellwig 32172ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3218f46b5a66SChristoph Hellwig { 3219f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3220f46b5a66SChristoph Hellwig int ret; 3221f46b5a66SChristoph Hellwig 3222e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3223e441d54dSChris Mason return -EPERM; 3224e441d54dSChris Mason 3225c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3226e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3227c9e9f97bSIlya Dryomov 3228dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3229c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3230c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3231c9e9f97bSIlya Dryomov goto out; 3232c9e9f97bSIlya Dryomov } 3233f46b5a66SChristoph Hellwig 32345516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32352ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3236f46b5a66SChristoph Hellwig 323743d20761SAnand Jain if (!ret) 32380b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 323943d20761SAnand Jain 3240f46b5a66SChristoph Hellwig kfree(vol_args); 3241c9e9f97bSIlya Dryomov out: 3242c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3243f46b5a66SChristoph Hellwig return ret; 3244f46b5a66SChristoph Hellwig } 3245f46b5a66SChristoph Hellwig 32466b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3247f46b5a66SChristoph Hellwig { 32480b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32490b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32506b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3251f46b5a66SChristoph Hellwig int ret; 3252f46b5a66SChristoph Hellwig 3253e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3254e441d54dSChris Mason return -EPERM; 3255e441d54dSChris Mason 3256da24927bSMiao Xie ret = mnt_want_write_file(file); 3257da24927bSMiao Xie if (ret) 3258da24927bSMiao Xie return ret; 3259c146afadSYan Zheng 3260dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3261c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3262c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3263c47ca32dSDan Carpenter goto err_drop; 3264c9e9f97bSIlya Dryomov } 3265f46b5a66SChristoph Hellwig 3266748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3267fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3268fd4e994bSOmar Sandoval goto out; 3269fd4e994bSOmar Sandoval } 3270f46b5a66SChristoph Hellwig 3271c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3272183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3273183860f6SAnand Jain goto out; 3274183860f6SAnand Jain } 3275183860f6SAnand Jain 3276735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 32772ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 32786b526ed7SAnand Jain } else { 32796b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 32802ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 32816b526ed7SAnand Jain } 3282c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3283183860f6SAnand Jain 32846b526ed7SAnand Jain if (!ret) { 3285735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32860b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32876b526ed7SAnand Jain vol_args->devid); 32886b526ed7SAnand Jain else 32890b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32906b526ed7SAnand Jain vol_args->name); 32916b526ed7SAnand Jain } 3292183860f6SAnand Jain out: 3293183860f6SAnand Jain kfree(vol_args); 3294c47ca32dSDan Carpenter err_drop: 32954ac20c70SIlya Dryomov mnt_drop_write_file(file); 3296f46b5a66SChristoph Hellwig return ret; 3297f46b5a66SChristoph Hellwig } 3298f46b5a66SChristoph Hellwig 3299f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3300f46b5a66SChristoph Hellwig { 33010b246afaSJeff Mahoney struct inode *inode = file_inode(file); 33020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3303f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3304f46b5a66SChristoph Hellwig int ret; 3305f46b5a66SChristoph Hellwig 3306f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3307f46b5a66SChristoph Hellwig return -EPERM; 3308f46b5a66SChristoph Hellwig 3309f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3310f46b5a66SChristoph Hellwig if (ret) 3311f46b5a66SChristoph Hellwig return ret; 3312f46b5a66SChristoph Hellwig 3313c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3314f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 331558d7bbf8SDavid Sterba goto out_drop_write; 331658d7bbf8SDavid Sterba } 331758d7bbf8SDavid Sterba 331858d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 331958d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 332058d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3321f46b5a66SChristoph Hellwig goto out; 3322f46b5a66SChristoph Hellwig } 3323f46b5a66SChristoph Hellwig 332458d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 33252ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3326f46b5a66SChristoph Hellwig 3327f46b5a66SChristoph Hellwig if (!ret) 33280b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3329f46b5a66SChristoph Hellwig kfree(vol_args); 333058d7bbf8SDavid Sterba out: 3331c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 333258d7bbf8SDavid Sterba out_drop_write: 3333f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 333458d7bbf8SDavid Sterba 3335f46b5a66SChristoph Hellwig return ret; 3336f46b5a66SChristoph Hellwig } 3337f46b5a66SChristoph Hellwig 33382ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33392ff7e61eSJeff Mahoney void __user *arg) 3340475f6387SJan Schmidt { 3341027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3342475f6387SJan Schmidt struct btrfs_device *device; 33430b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3344137c5418SJohannes Thumshirn u64 flags_in; 3345027ed2f0SLi Zefan int ret = 0; 3346475f6387SJan Schmidt 3347137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3348137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3349137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3350137c5418SJohannes Thumshirn 3351137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3352137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3353027ed2f0SLi Zefan 3354d03262c7SDavid Sterba rcu_read_lock(); 3355027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3356475f6387SJan Schmidt 3357d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3358027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3359027ed2f0SLi Zefan fi_args->max_id = device->devid; 3360475f6387SJan Schmidt } 3361d03262c7SDavid Sterba rcu_read_unlock(); 3362475f6387SJan Schmidt 3363de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3364bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3365bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3366bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 336780a773fbSDavid Sterba 3368137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3369137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3370137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3371137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3372137c5418SJohannes Thumshirn } 3373137c5418SJohannes Thumshirn 33740fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33750fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33760fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33770fb408a5SJohannes Thumshirn } 33780fb408a5SJohannes Thumshirn 337949bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 338049bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 338149bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 338249bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 338349bac897SJohannes Thumshirn } 338449bac897SJohannes Thumshirn 3385027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3386027ed2f0SLi Zefan ret = -EFAULT; 3387475f6387SJan Schmidt 3388027ed2f0SLi Zefan kfree(fi_args); 3389027ed2f0SLi Zefan return ret; 3390475f6387SJan Schmidt } 3391475f6387SJan Schmidt 33922ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33932ff7e61eSJeff Mahoney void __user *arg) 3394475f6387SJan Schmidt { 3395475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3396475f6387SJan Schmidt struct btrfs_device *dev; 3397475f6387SJan Schmidt int ret = 0; 3398475f6387SJan Schmidt char *s_uuid = NULL; 3399475f6387SJan Schmidt 3400475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3401475f6387SJan Schmidt if (IS_ERR(di_args)) 3402475f6387SJan Schmidt return PTR_ERR(di_args); 3403475f6387SJan Schmidt 3404dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3405475f6387SJan Schmidt s_uuid = di_args->uuid; 3406475f6387SJan Schmidt 3407c5593ca3SDavid Sterba rcu_read_lock(); 3408e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3409b2598edfSAnand Jain NULL); 3410475f6387SJan Schmidt 3411475f6387SJan Schmidt if (!dev) { 3412475f6387SJan Schmidt ret = -ENODEV; 3413475f6387SJan Schmidt goto out; 3414475f6387SJan Schmidt } 3415475f6387SJan Schmidt 3416475f6387SJan Schmidt di_args->devid = dev->devid; 34177cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 34187cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3419475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3420a27202fbSJim Meyering if (dev->name) { 3421672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3422672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3423a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3424a27202fbSJim Meyering } else { 342599ba55adSStefan Behrens di_args->path[0] = '\0'; 3426a27202fbSJim Meyering } 3427475f6387SJan Schmidt 3428475f6387SJan Schmidt out: 3429c5593ca3SDavid Sterba rcu_read_unlock(); 3430475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3431475f6387SJan Schmidt ret = -EFAULT; 3432475f6387SJan Schmidt 3433475f6387SJan Schmidt kfree(di_args); 3434475f6387SJan Schmidt return ret; 3435475f6387SJan Schmidt } 3436475f6387SJan Schmidt 34376ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34386ef5ed0dSJosef Bacik { 3439496ad9aaSAl Viro struct inode *inode = file_inode(file); 34400b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34416ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34426ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34436ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34446ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34452a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34466ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34476ef5ed0dSJosef Bacik u64 objectid = 0; 34486ef5ed0dSJosef Bacik u64 dir_id; 34493c04ce01SMiao Xie int ret; 34506ef5ed0dSJosef Bacik 34516ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34526ef5ed0dSJosef Bacik return -EPERM; 34536ef5ed0dSJosef Bacik 34543c04ce01SMiao Xie ret = mnt_want_write_file(file); 34553c04ce01SMiao Xie if (ret) 34563c04ce01SMiao Xie return ret; 34573c04ce01SMiao Xie 34583c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34593c04ce01SMiao Xie ret = -EFAULT; 34603c04ce01SMiao Xie goto out; 34613c04ce01SMiao Xie } 34626ef5ed0dSJosef Bacik 34636ef5ed0dSJosef Bacik if (!objectid) 34641cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34656ef5ed0dSJosef Bacik 346656e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34673c04ce01SMiao Xie if (IS_ERR(new_root)) { 34683c04ce01SMiao Xie ret = PTR_ERR(new_root); 34693c04ce01SMiao Xie goto out; 34703c04ce01SMiao Xie } 34712a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34722a2b5d62SJosef Bacik ret = -ENOENT; 34732a2b5d62SJosef Bacik goto out_free; 34742a2b5d62SJosef Bacik } 34756ef5ed0dSJosef Bacik 34766ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34773c04ce01SMiao Xie if (!path) { 34783c04ce01SMiao Xie ret = -ENOMEM; 34792a2b5d62SJosef Bacik goto out_free; 34803c04ce01SMiao Xie } 34816ef5ed0dSJosef Bacik 34826ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 348398d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34843c04ce01SMiao Xie ret = PTR_ERR(trans); 34852a2b5d62SJosef Bacik goto out_free; 34866ef5ed0dSJosef Bacik } 34876ef5ed0dSJosef Bacik 34880b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34890b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34906ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3491cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34922a2b5d62SJosef Bacik btrfs_release_path(path); 34933a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34940b246afaSJeff Mahoney btrfs_err(fs_info, 34955d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34963c04ce01SMiao Xie ret = -ENOENT; 34972a2b5d62SJosef Bacik goto out_free; 34986ef5ed0dSJosef Bacik } 34996ef5ed0dSJosef Bacik 35006ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 35016ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 35026ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 35032a2b5d62SJosef Bacik btrfs_release_path(path); 35046ef5ed0dSJosef Bacik 35050b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 35063a45bb20SJeff Mahoney btrfs_end_transaction(trans); 35072a2b5d62SJosef Bacik out_free: 350800246528SJosef Bacik btrfs_put_root(new_root); 35092a2b5d62SJosef Bacik btrfs_free_path(path); 35103c04ce01SMiao Xie out: 35113c04ce01SMiao Xie mnt_drop_write_file(file); 35123c04ce01SMiao Xie return ret; 35136ef5ed0dSJosef Bacik } 35146ef5ed0dSJosef Bacik 3515c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3516bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3517bf5fc093SJosef Bacik { 351832da5386SDavid Sterba struct btrfs_block_group *block_group; 3519bf5fc093SJosef Bacik 3520bf5fc093SJosef Bacik space->total_bytes = 0; 3521bf5fc093SJosef Bacik space->used_bytes = 0; 3522bf5fc093SJosef Bacik space->flags = 0; 3523bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3524bf5fc093SJosef Bacik space->flags = block_group->flags; 3525b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3526bf38be65SDavid Sterba space->used_bytes += block_group->used; 3527bf5fc093SJosef Bacik } 3528bf5fc093SJosef Bacik } 3529bf5fc093SJosef Bacik 35302ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 35312ff7e61eSJeff Mahoney void __user *arg) 35321406e432SJosef Bacik { 35331406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35341406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35351406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35367fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 353713f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35381406e432SJosef Bacik struct btrfs_space_info *info; 3539315d8e98SColin Ian King static const u64 types[] = { 3540315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3541bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3542bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3543315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3544315d8e98SColin Ian King }; 3545bf5fc093SJosef Bacik int num_types = 4; 35467fde62bfSChris Mason int alloc_size; 35471406e432SJosef Bacik int ret = 0; 354851788b1bSDan Rosenberg u64 slot_count = 0; 3549bf5fc093SJosef Bacik int i, c; 35501406e432SJosef Bacik 35511406e432SJosef Bacik if (copy_from_user(&space_args, 35521406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35531406e432SJosef Bacik sizeof(space_args))) 35541406e432SJosef Bacik return -EFAULT; 35551406e432SJosef Bacik 3556bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3557bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3558bf5fc093SJosef Bacik 3559bf5fc093SJosef Bacik info = NULL; 356072804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3561bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3562bf5fc093SJosef Bacik info = tmp; 3563bf5fc093SJosef Bacik break; 3564bf5fc093SJosef Bacik } 3565bf5fc093SJosef Bacik } 35661406e432SJosef Bacik 3567bf5fc093SJosef Bacik if (!info) 3568bf5fc093SJosef Bacik continue; 3569bf5fc093SJosef Bacik 3570bf5fc093SJosef Bacik down_read(&info->groups_sem); 3571bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3572bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3573bf5fc093SJosef Bacik slot_count++; 3574bf5fc093SJosef Bacik } 3575bf5fc093SJosef Bacik up_read(&info->groups_sem); 3576bf5fc093SJosef Bacik } 3577bf5fc093SJosef Bacik 357836523e95SDavid Sterba /* 357936523e95SDavid Sterba * Global block reserve, exported as a space_info 358036523e95SDavid Sterba */ 358136523e95SDavid Sterba slot_count++; 358236523e95SDavid Sterba 35837fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35847fde62bfSChris Mason if (space_args.space_slots == 0) { 35857fde62bfSChris Mason space_args.total_spaces = slot_count; 35867fde62bfSChris Mason goto out; 35877fde62bfSChris Mason } 3588bf5fc093SJosef Bacik 358951788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3590bf5fc093SJosef Bacik 35917fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3592bf5fc093SJosef Bacik 35937fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35947fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35957fde62bfSChris Mason */ 359609cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35977fde62bfSChris Mason return -ENOMEM; 35987fde62bfSChris Mason 35997fde62bfSChris Mason space_args.total_spaces = 0; 36008d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 36017fde62bfSChris Mason if (!dest) 36027fde62bfSChris Mason return -ENOMEM; 36037fde62bfSChris Mason dest_orig = dest; 36047fde62bfSChris Mason 36057fde62bfSChris Mason /* now we have a buffer to copy into */ 3606bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3607bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3608bf5fc093SJosef Bacik 360951788b1bSDan Rosenberg if (!slot_count) 361051788b1bSDan Rosenberg break; 361151788b1bSDan Rosenberg 3612bf5fc093SJosef Bacik info = NULL; 361372804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3614bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3615bf5fc093SJosef Bacik info = tmp; 36167fde62bfSChris Mason break; 3617bf5fc093SJosef Bacik } 3618bf5fc093SJosef Bacik } 36197fde62bfSChris Mason 3620bf5fc093SJosef Bacik if (!info) 3621bf5fc093SJosef Bacik continue; 3622bf5fc093SJosef Bacik down_read(&info->groups_sem); 3623bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3624bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3625c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3626c065f5b1SSu Yue &space); 36277fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36281406e432SJosef Bacik dest++; 36291406e432SJosef Bacik space_args.total_spaces++; 363051788b1bSDan Rosenberg slot_count--; 36311406e432SJosef Bacik } 363251788b1bSDan Rosenberg if (!slot_count) 363351788b1bSDan Rosenberg break; 3634bf5fc093SJosef Bacik } 3635bf5fc093SJosef Bacik up_read(&info->groups_sem); 3636bf5fc093SJosef Bacik } 36371406e432SJosef Bacik 363836523e95SDavid Sterba /* 363936523e95SDavid Sterba * Add global block reserve 364036523e95SDavid Sterba */ 364136523e95SDavid Sterba if (slot_count) { 36420b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 364336523e95SDavid Sterba 364436523e95SDavid Sterba spin_lock(&block_rsv->lock); 364536523e95SDavid Sterba space.total_bytes = block_rsv->size; 364636523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 364736523e95SDavid Sterba spin_unlock(&block_rsv->lock); 364836523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 364936523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 365036523e95SDavid Sterba space_args.total_spaces++; 365136523e95SDavid Sterba } 365236523e95SDavid Sterba 36532eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36547fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36557fde62bfSChris Mason 36567fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36577fde62bfSChris Mason ret = -EFAULT; 36587fde62bfSChris Mason 36597fde62bfSChris Mason kfree(dest_orig); 36607fde62bfSChris Mason out: 36617fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36621406e432SJosef Bacik ret = -EFAULT; 36631406e432SJosef Bacik 36641406e432SJosef Bacik return ret; 36651406e432SJosef Bacik } 36661406e432SJosef Bacik 36679a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36689a8c28beSMiao Xie void __user *argp) 366946204592SSage Weil { 367046204592SSage Weil struct btrfs_trans_handle *trans; 367146204592SSage Weil u64 transid; 3672db5b493aSTsutomu Itoh int ret; 367346204592SSage Weil 3674d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3675ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3676ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 367798d5dc13STsutomu Itoh return PTR_ERR(trans); 3678ff7c1d33SMiao Xie 3679ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3680ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3681ff7c1d33SMiao Xie goto out; 3682ff7c1d33SMiao Xie } 368346204592SSage Weil transid = trans->transid; 36843a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36858b2b2d3cSTsutomu Itoh if (ret) { 36863a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3687db5b493aSTsutomu Itoh return ret; 36888b2b2d3cSTsutomu Itoh } 3689ff7c1d33SMiao Xie out: 369046204592SSage Weil if (argp) 369146204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 369246204592SSage Weil return -EFAULT; 369346204592SSage Weil return 0; 369446204592SSage Weil } 369546204592SSage Weil 36962ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36979a8c28beSMiao Xie void __user *argp) 369846204592SSage Weil { 369946204592SSage Weil u64 transid; 370046204592SSage Weil 370146204592SSage Weil if (argp) { 370246204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 370346204592SSage Weil return -EFAULT; 370446204592SSage Weil } else { 370546204592SSage Weil transid = 0; /* current trans */ 370646204592SSage Weil } 37072ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 370846204592SSage Weil } 370946204592SSage Weil 3710b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3711475f6387SJan Schmidt { 37120b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3713475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3714b8e95489SMiao Xie int ret; 3715475f6387SJan Schmidt 3716475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3717475f6387SJan Schmidt return -EPERM; 3718475f6387SJan Schmidt 3719475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3720475f6387SJan Schmidt if (IS_ERR(sa)) 3721475f6387SJan Schmidt return PTR_ERR(sa); 3722475f6387SJan Schmidt 3723b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3724b8e95489SMiao Xie ret = mnt_want_write_file(file); 3725b8e95489SMiao Xie if (ret) 3726b8e95489SMiao Xie goto out; 3727b8e95489SMiao Xie } 3728b8e95489SMiao Xie 37290b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 373063a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 373163a212abSStefan Behrens 0); 3732475f6387SJan Schmidt 37335afe6ce7SFilipe Manana /* 37345afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37355afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37365afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37375afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37385afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37395afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37405afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37415afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37425afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37435afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37445afe6ce7SFilipe Manana */ 37455afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3746475f6387SJan Schmidt ret = -EFAULT; 3747475f6387SJan Schmidt 3748b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3749b8e95489SMiao Xie mnt_drop_write_file(file); 3750b8e95489SMiao Xie out: 3751475f6387SJan Schmidt kfree(sa); 3752475f6387SJan Schmidt return ret; 3753475f6387SJan Schmidt } 3754475f6387SJan Schmidt 37552ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3756475f6387SJan Schmidt { 3757475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3758475f6387SJan Schmidt return -EPERM; 3759475f6387SJan Schmidt 37602ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3761475f6387SJan Schmidt } 3762475f6387SJan Schmidt 37632ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3764475f6387SJan Schmidt void __user *arg) 3765475f6387SJan Schmidt { 3766475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3767475f6387SJan Schmidt int ret; 3768475f6387SJan Schmidt 3769475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3770475f6387SJan Schmidt return -EPERM; 3771475f6387SJan Schmidt 3772475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3773475f6387SJan Schmidt if (IS_ERR(sa)) 3774475f6387SJan Schmidt return PTR_ERR(sa); 3775475f6387SJan Schmidt 37762ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3777475f6387SJan Schmidt 37784fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3779475f6387SJan Schmidt ret = -EFAULT; 3780475f6387SJan Schmidt 3781475f6387SJan Schmidt kfree(sa); 3782475f6387SJan Schmidt return ret; 3783475f6387SJan Schmidt } 3784475f6387SJan Schmidt 37852ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3786b27f7c0cSDavid Sterba void __user *arg) 3787c11d2c23SStefan Behrens { 3788c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3789c11d2c23SStefan Behrens int ret; 3790c11d2c23SStefan Behrens 3791c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3792c11d2c23SStefan Behrens if (IS_ERR(sa)) 3793c11d2c23SStefan Behrens return PTR_ERR(sa); 3794c11d2c23SStefan Behrens 3795b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3796b27f7c0cSDavid Sterba kfree(sa); 3797b27f7c0cSDavid Sterba return -EPERM; 3798b27f7c0cSDavid Sterba } 3799b27f7c0cSDavid Sterba 38002ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3801c11d2c23SStefan Behrens 3802eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3803c11d2c23SStefan Behrens ret = -EFAULT; 3804c11d2c23SStefan Behrens 3805c11d2c23SStefan Behrens kfree(sa); 3806c11d2c23SStefan Behrens return ret; 3807c11d2c23SStefan Behrens } 3808c11d2c23SStefan Behrens 38092ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 38102ff7e61eSJeff Mahoney void __user *arg) 38113f6bcfbdSStefan Behrens { 38123f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 38133f6bcfbdSStefan Behrens int ret; 38143f6bcfbdSStefan Behrens 38153f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 38163f6bcfbdSStefan Behrens return -EPERM; 38173f6bcfbdSStefan Behrens 38183f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38193f6bcfbdSStefan Behrens if (IS_ERR(p)) 38203f6bcfbdSStefan Behrens return PTR_ERR(p); 38213f6bcfbdSStefan Behrens 38223f6bcfbdSStefan Behrens switch (p->cmd) { 38233f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3824bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3825adfa97cbSIlya Dryomov ret = -EROFS; 3826adfa97cbSIlya Dryomov goto out; 3827adfa97cbSIlya Dryomov } 3828c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3829e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38303f6bcfbdSStefan Behrens } else { 38312ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3832c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38333f6bcfbdSStefan Behrens } 38343f6bcfbdSStefan Behrens break; 38353f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38360b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38373f6bcfbdSStefan Behrens ret = 0; 38383f6bcfbdSStefan Behrens break; 38393f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 384017d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 384197282031SAnand Jain ret = 0; 38423f6bcfbdSStefan Behrens break; 38433f6bcfbdSStefan Behrens default: 38443f6bcfbdSStefan Behrens ret = -EINVAL; 38453f6bcfbdSStefan Behrens break; 38463f6bcfbdSStefan Behrens } 38473f6bcfbdSStefan Behrens 3848d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38493f6bcfbdSStefan Behrens ret = -EFAULT; 3850adfa97cbSIlya Dryomov out: 38513f6bcfbdSStefan Behrens kfree(p); 38523f6bcfbdSStefan Behrens return ret; 38533f6bcfbdSStefan Behrens } 38543f6bcfbdSStefan Behrens 3855d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3856d7728c96SJan Schmidt { 3857d7728c96SJan Schmidt int ret = 0; 3858d7728c96SJan Schmidt int i; 3859740c3d22SChris Mason u64 rel_ptr; 3860d7728c96SJan Schmidt int size; 3861806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3862d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3863d7728c96SJan Schmidt struct btrfs_path *path; 3864d7728c96SJan Schmidt 386582b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3866d7728c96SJan Schmidt return -EPERM; 3867d7728c96SJan Schmidt 3868d7728c96SJan Schmidt path = btrfs_alloc_path(); 3869d7728c96SJan Schmidt if (!path) { 3870d7728c96SJan Schmidt ret = -ENOMEM; 3871d7728c96SJan Schmidt goto out; 3872d7728c96SJan Schmidt } 3873d7728c96SJan Schmidt 3874d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3875d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3876d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3877d7728c96SJan Schmidt ipa = NULL; 3878d7728c96SJan Schmidt goto out; 3879d7728c96SJan Schmidt } 3880d7728c96SJan Schmidt 3881d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3882d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3883d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3884d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3885d7728c96SJan Schmidt ipath = NULL; 3886d7728c96SJan Schmidt goto out; 3887d7728c96SJan Schmidt } 3888d7728c96SJan Schmidt 3889d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3890d7728c96SJan Schmidt if (ret < 0) 3891d7728c96SJan Schmidt goto out; 3892d7728c96SJan Schmidt 3893d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3894745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3895745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3896740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3897d7728c96SJan Schmidt } 3898d7728c96SJan Schmidt 3899718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3900718dc5faSOmar Sandoval ipath->fspath, size); 3901d7728c96SJan Schmidt if (ret) { 3902d7728c96SJan Schmidt ret = -EFAULT; 3903d7728c96SJan Schmidt goto out; 3904d7728c96SJan Schmidt } 3905d7728c96SJan Schmidt 3906d7728c96SJan Schmidt out: 3907d7728c96SJan Schmidt btrfs_free_path(path); 3908d7728c96SJan Schmidt free_ipath(ipath); 3909d7728c96SJan Schmidt kfree(ipa); 3910d7728c96SJan Schmidt 3911d7728c96SJan Schmidt return ret; 3912d7728c96SJan Schmidt } 3913d7728c96SJan Schmidt 3914d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3915d7728c96SJan Schmidt { 3916d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3917d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3918d7728c96SJan Schmidt 3919d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3920d7728c96SJan Schmidt inodes->bytes_left -= c; 3921d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3922d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3923d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3924d7728c96SJan Schmidt inodes->elem_cnt += 3; 3925d7728c96SJan Schmidt } else { 3926d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3927d7728c96SJan Schmidt inodes->bytes_left = 0; 3928d7728c96SJan Schmidt inodes->elem_missed += 3; 3929d7728c96SJan Schmidt } 3930d7728c96SJan Schmidt 3931d7728c96SJan Schmidt return 0; 3932d7728c96SJan Schmidt } 3933d7728c96SJan Schmidt 39342ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3935d24a67b2SZygo Blaxell void __user *arg, int version) 3936d7728c96SJan Schmidt { 3937d7728c96SJan Schmidt int ret = 0; 3938d7728c96SJan Schmidt int size; 3939d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3940d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3941d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3942d24a67b2SZygo Blaxell bool ignore_offset; 3943d7728c96SJan Schmidt 3944d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3945d7728c96SJan Schmidt return -EPERM; 3946d7728c96SJan Schmidt 3947d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39487b9ea627SShailendra Verma if (IS_ERR(loi)) 39497b9ea627SShailendra Verma return PTR_ERR(loi); 3950d7728c96SJan Schmidt 3951d24a67b2SZygo Blaxell if (version == 1) { 3952d24a67b2SZygo Blaxell ignore_offset = false; 3953b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3954d24a67b2SZygo Blaxell } else { 3955d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3956d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3957d24a67b2SZygo Blaxell ret = -EINVAL; 3958d24a67b2SZygo Blaxell goto out_loi; 3959d24a67b2SZygo Blaxell } 3960d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3961d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3962d24a67b2SZygo Blaxell ret = -EINVAL; 3963d24a67b2SZygo Blaxell goto out_loi; 3964d24a67b2SZygo Blaxell } 3965d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3966b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3967d24a67b2SZygo Blaxell } 3968d24a67b2SZygo Blaxell 3969d7728c96SJan Schmidt path = btrfs_alloc_path(); 3970d7728c96SJan Schmidt if (!path) { 3971d7728c96SJan Schmidt ret = -ENOMEM; 3972d7728c96SJan Schmidt goto out; 3973d7728c96SJan Schmidt } 3974d7728c96SJan Schmidt 3975d7728c96SJan Schmidt inodes = init_data_container(size); 3976d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3977d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3978d7728c96SJan Schmidt inodes = NULL; 3979d7728c96SJan Schmidt goto out; 3980d7728c96SJan Schmidt } 3981d7728c96SJan Schmidt 39822ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3983d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3984df031f07SLiu Bo if (ret == -EINVAL) 3985d7728c96SJan Schmidt ret = -ENOENT; 3986d7728c96SJan Schmidt if (ret < 0) 3987d7728c96SJan Schmidt goto out; 3988d7728c96SJan Schmidt 3989718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3990718dc5faSOmar Sandoval size); 3991d7728c96SJan Schmidt if (ret) 3992d7728c96SJan Schmidt ret = -EFAULT; 3993d7728c96SJan Schmidt 3994d7728c96SJan Schmidt out: 3995d7728c96SJan Schmidt btrfs_free_path(path); 3996f54de068SDavid Sterba kvfree(inodes); 3997d24a67b2SZygo Blaxell out_loi: 3998d7728c96SJan Schmidt kfree(loi); 3999d7728c96SJan Schmidt 4000d7728c96SJan Schmidt return ret; 4001d7728c96SJan Schmidt } 4002d7728c96SJan Schmidt 4003008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 4004c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 4005c9e9f97bSIlya Dryomov { 4006c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 4007c9e9f97bSIlya Dryomov 4008c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4009c9e9f97bSIlya Dryomov 40103009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4011837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4012837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4013837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4014a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4015a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4016837d5b6eSIlya Dryomov 4017c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4018c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4019c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 402019a39dceSIlya Dryomov 402119a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 402219a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 402319a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4024c9e9f97bSIlya Dryomov } 4025c9e9f97bSIlya Dryomov 40269ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4027c9e9f97bSIlya Dryomov { 4028496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4029c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4030c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4031c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4032ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4033c9e9f97bSIlya Dryomov int ret; 4034c9e9f97bSIlya Dryomov 4035c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4036c9e9f97bSIlya Dryomov return -EPERM; 4037c9e9f97bSIlya Dryomov 4038e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40399ba1f6e4SLiu Bo if (ret) 40409ba1f6e4SLiu Bo return ret; 40419ba1f6e4SLiu Bo 4042ed0fb78fSIlya Dryomov again: 4043c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4044c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4045ed0fb78fSIlya Dryomov need_unlock = true; 4046ed0fb78fSIlya Dryomov goto locked; 4047ed0fb78fSIlya Dryomov } 4048ed0fb78fSIlya Dryomov 4049ed0fb78fSIlya Dryomov /* 405001327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4051ed0fb78fSIlya Dryomov * (1) some other op is running 4052ed0fb78fSIlya Dryomov * (2) balance is running 4053ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4054ed0fb78fSIlya Dryomov */ 4055ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4056ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4057ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40583009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4059ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4060dccdb07bSDavid Sterba /* 4061dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4062dccdb07bSDavid Sterba * we'll reexamine the status again. 4063dccdb07bSDavid Sterba */ 4064ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4065ed0fb78fSIlya Dryomov 4066ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40673009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4068ed0fb78fSIlya Dryomov /* this is (3) */ 4069ed0fb78fSIlya Dryomov need_unlock = false; 4070ed0fb78fSIlya Dryomov goto locked; 4071ed0fb78fSIlya Dryomov } 4072ed0fb78fSIlya Dryomov 4073ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4074ed0fb78fSIlya Dryomov goto again; 4075ed0fb78fSIlya Dryomov } else { 4076ed0fb78fSIlya Dryomov /* this is (2) */ 4077ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4078ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4079ed0fb78fSIlya Dryomov goto out; 4080ed0fb78fSIlya Dryomov } 4081ed0fb78fSIlya Dryomov } else { 4082ed0fb78fSIlya Dryomov /* this is (1) */ 4083ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4084e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4085ed0fb78fSIlya Dryomov goto out; 4086ed0fb78fSIlya Dryomov } 4087ed0fb78fSIlya Dryomov 4088ed0fb78fSIlya Dryomov locked: 4089c9e9f97bSIlya Dryomov 4090c9e9f97bSIlya Dryomov if (arg) { 4091c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4092c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4093c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4094ed0fb78fSIlya Dryomov goto out_unlock; 4095c9e9f97bSIlya Dryomov } 4096de322263SIlya Dryomov 4097de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4098de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4099de322263SIlya Dryomov ret = -ENOTCONN; 4100de322263SIlya Dryomov goto out_bargs; 4101de322263SIlya Dryomov } 4102de322263SIlya Dryomov 4103de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4104de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4105de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4106de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4107de322263SIlya Dryomov 4108de322263SIlya Dryomov goto do_balance; 4109de322263SIlya Dryomov } 4110c9e9f97bSIlya Dryomov } else { 4111c9e9f97bSIlya Dryomov bargs = NULL; 4112c9e9f97bSIlya Dryomov } 4113c9e9f97bSIlya Dryomov 4114ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4115837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4116837d5b6eSIlya Dryomov goto out_bargs; 4117837d5b6eSIlya Dryomov } 4118837d5b6eSIlya Dryomov 41198d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4120c9e9f97bSIlya Dryomov if (!bctl) { 4121c9e9f97bSIlya Dryomov ret = -ENOMEM; 4122c9e9f97bSIlya Dryomov goto out_bargs; 4123c9e9f97bSIlya Dryomov } 4124c9e9f97bSIlya Dryomov 4125c9e9f97bSIlya Dryomov if (arg) { 4126c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4127c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4128c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4129c9e9f97bSIlya Dryomov 4130c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4131f43ffb60SIlya Dryomov } else { 4132f43ffb60SIlya Dryomov /* balance everything - no filters */ 4133f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4134c9e9f97bSIlya Dryomov } 4135c9e9f97bSIlya Dryomov 41368eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41378eb93459SDavid Sterba ret = -EINVAL; 41380f89abf5SChristian Engelmayer goto out_bctl; 41398eb93459SDavid Sterba } 41408eb93459SDavid Sterba 4141de322263SIlya Dryomov do_balance: 4142c9e9f97bSIlya Dryomov /* 4143c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4144c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4145c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4146c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4147c9e9f97bSIlya Dryomov */ 4148ed0fb78fSIlya Dryomov need_unlock = false; 4149ed0fb78fSIlya Dryomov 41506fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41510f89abf5SChristian Engelmayer bctl = NULL; 4152ed0fb78fSIlya Dryomov 4153d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4154c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4155c9e9f97bSIlya Dryomov ret = -EFAULT; 4156c9e9f97bSIlya Dryomov } 4157c9e9f97bSIlya Dryomov 41580f89abf5SChristian Engelmayer out_bctl: 41590f89abf5SChristian Engelmayer kfree(bctl); 4160c9e9f97bSIlya Dryomov out_bargs: 4161c9e9f97bSIlya Dryomov kfree(bargs); 4162ed0fb78fSIlya Dryomov out_unlock: 4163c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4164ed0fb78fSIlya Dryomov if (need_unlock) 4165c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4166ed0fb78fSIlya Dryomov out: 4167e54bfa31SLiu Bo mnt_drop_write_file(file); 4168c9e9f97bSIlya Dryomov return ret; 4169c9e9f97bSIlya Dryomov } 4170c9e9f97bSIlya Dryomov 41712ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4172837d5b6eSIlya Dryomov { 4173837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4174837d5b6eSIlya Dryomov return -EPERM; 4175837d5b6eSIlya Dryomov 4176837d5b6eSIlya Dryomov switch (cmd) { 4177837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41780b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4179a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41800b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4181837d5b6eSIlya Dryomov } 4182837d5b6eSIlya Dryomov 4183837d5b6eSIlya Dryomov return -EINVAL; 4184837d5b6eSIlya Dryomov } 4185837d5b6eSIlya Dryomov 41862ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 418719a39dceSIlya Dryomov void __user *arg) 418819a39dceSIlya Dryomov { 418919a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 419019a39dceSIlya Dryomov int ret = 0; 419119a39dceSIlya Dryomov 419219a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 419319a39dceSIlya Dryomov return -EPERM; 419419a39dceSIlya Dryomov 419519a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 419619a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 419719a39dceSIlya Dryomov ret = -ENOTCONN; 419819a39dceSIlya Dryomov goto out; 419919a39dceSIlya Dryomov } 420019a39dceSIlya Dryomov 42018d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 420219a39dceSIlya Dryomov if (!bargs) { 420319a39dceSIlya Dryomov ret = -ENOMEM; 420419a39dceSIlya Dryomov goto out; 420519a39dceSIlya Dryomov } 420619a39dceSIlya Dryomov 4207008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 420819a39dceSIlya Dryomov 420919a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 421019a39dceSIlya Dryomov ret = -EFAULT; 421119a39dceSIlya Dryomov 421219a39dceSIlya Dryomov kfree(bargs); 421319a39dceSIlya Dryomov out: 421419a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 421519a39dceSIlya Dryomov return ret; 421619a39dceSIlya Dryomov } 421719a39dceSIlya Dryomov 4218905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 42195d13a37bSArne Jansen { 42200b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42210b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42225d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 42235d13a37bSArne Jansen int ret; 42245d13a37bSArne Jansen 42255d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42265d13a37bSArne Jansen return -EPERM; 42275d13a37bSArne Jansen 4228905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4229905b0ddaSMiao Xie if (ret) 4230905b0ddaSMiao Xie return ret; 42315d13a37bSArne Jansen 42325d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4233905b0ddaSMiao Xie if (IS_ERR(sa)) { 4234905b0ddaSMiao Xie ret = PTR_ERR(sa); 4235905b0ddaSMiao Xie goto drop_write; 4236905b0ddaSMiao Xie } 42375d13a37bSArne Jansen 42380b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42395d13a37bSArne Jansen 42405d13a37bSArne Jansen switch (sa->cmd) { 42415d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4242340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42435d13a37bSArne Jansen break; 42445d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4245340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42465d13a37bSArne Jansen break; 42475d13a37bSArne Jansen default: 42485d13a37bSArne Jansen ret = -EINVAL; 42495d13a37bSArne Jansen break; 42505d13a37bSArne Jansen } 42515d13a37bSArne Jansen 42525d13a37bSArne Jansen kfree(sa); 42530b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4254905b0ddaSMiao Xie drop_write: 4255905b0ddaSMiao Xie mnt_drop_write_file(file); 42565d13a37bSArne Jansen return ret; 42575d13a37bSArne Jansen } 42585d13a37bSArne Jansen 4259905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42605d13a37bSArne Jansen { 42610b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42620b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42630b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42645d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42655d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42665d13a37bSArne Jansen int ret; 42675d13a37bSArne Jansen int err; 42685d13a37bSArne Jansen 42695d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42705d13a37bSArne Jansen return -EPERM; 42715d13a37bSArne Jansen 4272905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4273905b0ddaSMiao Xie if (ret) 4274905b0ddaSMiao Xie return ret; 42755d13a37bSArne Jansen 42765d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4277905b0ddaSMiao Xie if (IS_ERR(sa)) { 4278905b0ddaSMiao Xie ret = PTR_ERR(sa); 4279905b0ddaSMiao Xie goto drop_write; 4280905b0ddaSMiao Xie } 42815d13a37bSArne Jansen 42825d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42835d13a37bSArne Jansen if (IS_ERR(trans)) { 42845d13a37bSArne Jansen ret = PTR_ERR(trans); 42855d13a37bSArne Jansen goto out; 42865d13a37bSArne Jansen } 42875d13a37bSArne Jansen 42885d13a37bSArne Jansen if (sa->assign) { 42899f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42905d13a37bSArne Jansen } else { 429139616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42925d13a37bSArne Jansen } 42935d13a37bSArne Jansen 4294e082f563SQu Wenruo /* update qgroup status and info */ 4295280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4296e082f563SQu Wenruo if (err < 0) 42970b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4298ad8403dfSAnand Jain "failed to update qgroup status and info"); 42993a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43005d13a37bSArne Jansen if (err && !ret) 43015d13a37bSArne Jansen ret = err; 43025d13a37bSArne Jansen 43035d13a37bSArne Jansen out: 43045d13a37bSArne Jansen kfree(sa); 4305905b0ddaSMiao Xie drop_write: 4306905b0ddaSMiao Xie mnt_drop_write_file(file); 43075d13a37bSArne Jansen return ret; 43085d13a37bSArne Jansen } 43095d13a37bSArne Jansen 4310905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 43115d13a37bSArne Jansen { 43120b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43130b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43145d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 43155d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43165d13a37bSArne Jansen int ret; 43175d13a37bSArne Jansen int err; 43185d13a37bSArne Jansen 43195d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43205d13a37bSArne Jansen return -EPERM; 43215d13a37bSArne Jansen 4322905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4323905b0ddaSMiao Xie if (ret) 4324905b0ddaSMiao Xie return ret; 43255d13a37bSArne Jansen 43265d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4327905b0ddaSMiao Xie if (IS_ERR(sa)) { 4328905b0ddaSMiao Xie ret = PTR_ERR(sa); 4329905b0ddaSMiao Xie goto drop_write; 4330905b0ddaSMiao Xie } 43315d13a37bSArne Jansen 4332d86e56cfSMiao Xie if (!sa->qgroupid) { 4333d86e56cfSMiao Xie ret = -EINVAL; 4334d86e56cfSMiao Xie goto out; 4335d86e56cfSMiao Xie } 4336d86e56cfSMiao Xie 43375d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43385d13a37bSArne Jansen if (IS_ERR(trans)) { 43395d13a37bSArne Jansen ret = PTR_ERR(trans); 43405d13a37bSArne Jansen goto out; 43415d13a37bSArne Jansen } 43425d13a37bSArne Jansen 43435d13a37bSArne Jansen if (sa->create) { 434449a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43455d13a37bSArne Jansen } else { 43463efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43475d13a37bSArne Jansen } 43485d13a37bSArne Jansen 43493a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43505d13a37bSArne Jansen if (err && !ret) 43515d13a37bSArne Jansen ret = err; 43525d13a37bSArne Jansen 43535d13a37bSArne Jansen out: 43545d13a37bSArne Jansen kfree(sa); 4355905b0ddaSMiao Xie drop_write: 4356905b0ddaSMiao Xie mnt_drop_write_file(file); 43575d13a37bSArne Jansen return ret; 43585d13a37bSArne Jansen } 43595d13a37bSArne Jansen 4360905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43615d13a37bSArne Jansen { 43620b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43630b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43645d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43655d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43665d13a37bSArne Jansen int ret; 43675d13a37bSArne Jansen int err; 43685d13a37bSArne Jansen u64 qgroupid; 43695d13a37bSArne Jansen 43705d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43715d13a37bSArne Jansen return -EPERM; 43725d13a37bSArne Jansen 4373905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4374905b0ddaSMiao Xie if (ret) 4375905b0ddaSMiao Xie return ret; 43765d13a37bSArne Jansen 43775d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4378905b0ddaSMiao Xie if (IS_ERR(sa)) { 4379905b0ddaSMiao Xie ret = PTR_ERR(sa); 4380905b0ddaSMiao Xie goto drop_write; 4381905b0ddaSMiao Xie } 43825d13a37bSArne Jansen 43835d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43845d13a37bSArne Jansen if (IS_ERR(trans)) { 43855d13a37bSArne Jansen ret = PTR_ERR(trans); 43865d13a37bSArne Jansen goto out; 43875d13a37bSArne Jansen } 43885d13a37bSArne Jansen 43895d13a37bSArne Jansen qgroupid = sa->qgroupid; 43905d13a37bSArne Jansen if (!qgroupid) { 43915d13a37bSArne Jansen /* take the current subvol as qgroup */ 43925d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43935d13a37bSArne Jansen } 43945d13a37bSArne Jansen 4395f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43965d13a37bSArne Jansen 43973a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43985d13a37bSArne Jansen if (err && !ret) 43995d13a37bSArne Jansen ret = err; 44005d13a37bSArne Jansen 44015d13a37bSArne Jansen out: 44025d13a37bSArne Jansen kfree(sa); 4403905b0ddaSMiao Xie drop_write: 4404905b0ddaSMiao Xie mnt_drop_write_file(file); 44055d13a37bSArne Jansen return ret; 44065d13a37bSArne Jansen } 44075d13a37bSArne Jansen 44082f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 44092f232036SJan Schmidt { 44100b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44122f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44132f232036SJan Schmidt int ret; 44142f232036SJan Schmidt 44152f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44162f232036SJan Schmidt return -EPERM; 44172f232036SJan Schmidt 44182f232036SJan Schmidt ret = mnt_want_write_file(file); 44192f232036SJan Schmidt if (ret) 44202f232036SJan Schmidt return ret; 44212f232036SJan Schmidt 44222f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 44232f232036SJan Schmidt if (IS_ERR(qsa)) { 44242f232036SJan Schmidt ret = PTR_ERR(qsa); 44252f232036SJan Schmidt goto drop_write; 44262f232036SJan Schmidt } 44272f232036SJan Schmidt 44282f232036SJan Schmidt if (qsa->flags) { 44292f232036SJan Schmidt ret = -EINVAL; 44302f232036SJan Schmidt goto out; 44312f232036SJan Schmidt } 44322f232036SJan Schmidt 44330b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44342f232036SJan Schmidt 44352f232036SJan Schmidt out: 44362f232036SJan Schmidt kfree(qsa); 44372f232036SJan Schmidt drop_write: 44382f232036SJan Schmidt mnt_drop_write_file(file); 44392f232036SJan Schmidt return ret; 44402f232036SJan Schmidt } 44412f232036SJan Schmidt 4442b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4443b929c1d8SMarcos Paulo de Souza void __user *arg) 44442f232036SJan Schmidt { 44452f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44462f232036SJan Schmidt int ret = 0; 44472f232036SJan Schmidt 44482f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44492f232036SJan Schmidt return -EPERM; 44502f232036SJan Schmidt 44518d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44522f232036SJan Schmidt if (!qsa) 44532f232036SJan Schmidt return -ENOMEM; 44542f232036SJan Schmidt 44550b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44562f232036SJan Schmidt qsa->flags = 1; 44570b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44582f232036SJan Schmidt } 44592f232036SJan Schmidt 44602f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44612f232036SJan Schmidt ret = -EFAULT; 44622f232036SJan Schmidt 44632f232036SJan Schmidt kfree(qsa); 44642f232036SJan Schmidt return ret; 44652f232036SJan Schmidt } 44662f232036SJan Schmidt 4467b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4468b929c1d8SMarcos Paulo de Souza void __user *arg) 446957254b6eSJan Schmidt { 447057254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 447157254b6eSJan Schmidt return -EPERM; 447257254b6eSJan Schmidt 44730b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 447457254b6eSJan Schmidt } 447557254b6eSJan Schmidt 4476abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4477abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44788ea05e3aSAlexander Block { 4479496ad9aaSAl Viro struct inode *inode = file_inode(file); 44800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44818ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44828ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44838ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 448495582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44858ea05e3aSAlexander Block int ret = 0; 4486dd5f9615SStefan Behrens int received_uuid_changed; 44878ea05e3aSAlexander Block 448821cb47beSChristian Brauner if (!inode_owner_or_capable(&init_user_ns, inode)) 4489bd60ea0fSDavid Sterba return -EPERM; 4490bd60ea0fSDavid Sterba 44918ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44928ea05e3aSAlexander Block if (ret < 0) 44938ea05e3aSAlexander Block return ret; 44948ea05e3aSAlexander Block 44950b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44968ea05e3aSAlexander Block 44974a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44988ea05e3aSAlexander Block ret = -EINVAL; 44998ea05e3aSAlexander Block goto out; 45008ea05e3aSAlexander Block } 45018ea05e3aSAlexander Block 45028ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 45038ea05e3aSAlexander Block ret = -EROFS; 45048ea05e3aSAlexander Block goto out; 45058ea05e3aSAlexander Block } 45068ea05e3aSAlexander Block 4507dd5f9615SStefan Behrens /* 4508dd5f9615SStefan Behrens * 1 - root item 4509dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4510dd5f9615SStefan Behrens */ 4511dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 45128ea05e3aSAlexander Block if (IS_ERR(trans)) { 45138ea05e3aSAlexander Block ret = PTR_ERR(trans); 45148ea05e3aSAlexander Block trans = NULL; 45158ea05e3aSAlexander Block goto out; 45168ea05e3aSAlexander Block } 45178ea05e3aSAlexander Block 45188ea05e3aSAlexander Block sa->rtransid = trans->transid; 45198ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 45208ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 45218ea05e3aSAlexander Block 4522dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4523dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4524dd5f9615SStefan Behrens if (received_uuid_changed && 4525d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4526d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4527dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4528dd5f9615SStefan Behrens root->root_key.objectid); 4529d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4530d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4531d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4532d87ff758SNikolay Borisov goto out; 4533d87ff758SNikolay Borisov } 4534d87ff758SNikolay Borisov } 45358ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45368ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45378ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45383cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45393cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45403cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45413cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45428ea05e3aSAlexander Block 45430b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45448ea05e3aSAlexander Block &root->root_key, &root->root_item); 45458ea05e3aSAlexander Block if (ret < 0) { 45463a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45478ea05e3aSAlexander Block goto out; 4548dd5f9615SStefan Behrens } 4549dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4550cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4551dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4552dd5f9615SStefan Behrens root->root_key.objectid); 4553dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 455466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4555efd38150SNikolay Borisov btrfs_end_transaction(trans); 4556dd5f9615SStefan Behrens goto out; 4557dd5f9615SStefan Behrens } 4558dd5f9615SStefan Behrens } 45593a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4560abccd00fSHugo Mills out: 45610b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4562abccd00fSHugo Mills mnt_drop_write_file(file); 4563abccd00fSHugo Mills return ret; 4564abccd00fSHugo Mills } 4565abccd00fSHugo Mills 4566abccd00fSHugo Mills #ifdef CONFIG_64BIT 4567abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4568abccd00fSHugo Mills void __user *arg) 4569abccd00fSHugo Mills { 4570abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4571abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4572abccd00fSHugo Mills int ret = 0; 4573abccd00fSHugo Mills 4574abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45757b9ea627SShailendra Verma if (IS_ERR(args32)) 45767b9ea627SShailendra Verma return PTR_ERR(args32); 4577abccd00fSHugo Mills 45788d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 457984dbeb87SDan Carpenter if (!args64) { 458084dbeb87SDan Carpenter ret = -ENOMEM; 4581abccd00fSHugo Mills goto out; 4582abccd00fSHugo Mills } 4583abccd00fSHugo Mills 4584abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4585abccd00fSHugo Mills args64->stransid = args32->stransid; 4586abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4587abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4588abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4589abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4590abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4591abccd00fSHugo Mills args64->flags = args32->flags; 4592abccd00fSHugo Mills 4593abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4594abccd00fSHugo Mills if (ret) 4595abccd00fSHugo Mills goto out; 4596abccd00fSHugo Mills 4597abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4598abccd00fSHugo Mills args32->stransid = args64->stransid; 4599abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4600abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4601abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4602abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4603abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4604abccd00fSHugo Mills args32->flags = args64->flags; 4605abccd00fSHugo Mills 4606abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4607abccd00fSHugo Mills if (ret) 4608abccd00fSHugo Mills ret = -EFAULT; 4609abccd00fSHugo Mills 4610abccd00fSHugo Mills out: 4611abccd00fSHugo Mills kfree(args32); 4612abccd00fSHugo Mills kfree(args64); 4613abccd00fSHugo Mills return ret; 4614abccd00fSHugo Mills } 4615abccd00fSHugo Mills #endif 4616abccd00fSHugo Mills 4617abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4618abccd00fSHugo Mills void __user *arg) 4619abccd00fSHugo Mills { 4620abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4621abccd00fSHugo Mills int ret = 0; 4622abccd00fSHugo Mills 4623abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 46247b9ea627SShailendra Verma if (IS_ERR(sa)) 46257b9ea627SShailendra Verma return PTR_ERR(sa); 4626abccd00fSHugo Mills 4627abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4628abccd00fSHugo Mills 4629abccd00fSHugo Mills if (ret) 4630abccd00fSHugo Mills goto out; 4631abccd00fSHugo Mills 46328ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46338ea05e3aSAlexander Block if (ret) 46348ea05e3aSAlexander Block ret = -EFAULT; 46358ea05e3aSAlexander Block 46368ea05e3aSAlexander Block out: 46378ea05e3aSAlexander Block kfree(sa); 46388ea05e3aSAlexander Block return ret; 46398ea05e3aSAlexander Block } 46408ea05e3aSAlexander Block 4641b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4642b929c1d8SMarcos Paulo de Souza void __user *arg) 4643867ab667Sjeff.liu { 4644a1b83ac5SAnand Jain size_t len; 4645867ab667Sjeff.liu int ret; 4646a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4647a1b83ac5SAnand Jain 46480b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46490b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46500b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4651a1b83ac5SAnand Jain 4652a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4653867ab667Sjeff.liu 4654867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46550b246afaSJeff Mahoney btrfs_warn(fs_info, 46560b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46570b246afaSJeff Mahoney --len); 4658867ab667Sjeff.liu } 4659867ab667Sjeff.liu 4660867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4661867ab667Sjeff.liu 4662867ab667Sjeff.liu return ret ? -EFAULT : 0; 4663867ab667Sjeff.liu } 4664867ab667Sjeff.liu 4665a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4666a8bfd4abSjeff.liu { 46670b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46680b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46690b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46700b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4671a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4672a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4673a8bfd4abSjeff.liu int ret; 4674a8bfd4abSjeff.liu 4675a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4676a8bfd4abSjeff.liu return -EPERM; 4677a8bfd4abSjeff.liu 4678a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4679a8bfd4abSjeff.liu return -EFAULT; 4680a8bfd4abSjeff.liu 4681a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46820b246afaSJeff Mahoney btrfs_err(fs_info, 46835d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4684a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4685a8bfd4abSjeff.liu return -EINVAL; 4686a8bfd4abSjeff.liu } 4687a8bfd4abSjeff.liu 4688a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4689a8bfd4abSjeff.liu if (ret) 4690a8bfd4abSjeff.liu return ret; 4691a8bfd4abSjeff.liu 4692a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4693a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4694a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4695a8bfd4abSjeff.liu goto out_unlock; 4696a8bfd4abSjeff.liu } 4697a8bfd4abSjeff.liu 46980b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4699a8bfd4abSjeff.liu strcpy(super_block->label, label); 47000b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 47013a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4702a8bfd4abSjeff.liu 4703a8bfd4abSjeff.liu out_unlock: 4704a8bfd4abSjeff.liu mnt_drop_write_file(file); 4705a8bfd4abSjeff.liu return ret; 4706a8bfd4abSjeff.liu } 4707a8bfd4abSjeff.liu 47082eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 47092eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 47102eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 47112eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 47122eaa055fSJeff Mahoney 4713d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 47142eaa055fSJeff Mahoney { 47154d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 47162eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 47172eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 47182eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 47192eaa055fSJeff Mahoney }; 47202eaa055fSJeff Mahoney 47212eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47222eaa055fSJeff Mahoney return -EFAULT; 47232eaa055fSJeff Mahoney 47242eaa055fSJeff Mahoney return 0; 47252eaa055fSJeff Mahoney } 47262eaa055fSJeff Mahoney 4727b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4728b929c1d8SMarcos Paulo de Souza void __user *arg) 47292eaa055fSJeff Mahoney { 47300b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47312eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47322eaa055fSJeff Mahoney 47332eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47342eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47352eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47362eaa055fSJeff Mahoney 47372eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47382eaa055fSJeff Mahoney return -EFAULT; 47392eaa055fSJeff Mahoney 47402eaa055fSJeff Mahoney return 0; 47412eaa055fSJeff Mahoney } 47422eaa055fSJeff Mahoney 47432ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47443b02a68aSJeff Mahoney enum btrfs_feature_set set, 47452eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47462eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47472eaa055fSJeff Mahoney { 4748f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47493b02a68aSJeff Mahoney char *names; 47502eaa055fSJeff Mahoney u64 disallowed, unsupported; 47512eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47522eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47532eaa055fSJeff Mahoney 47542eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47552eaa055fSJeff Mahoney if (unsupported) { 47563b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47573b02a68aSJeff Mahoney if (names) { 47580b246afaSJeff Mahoney btrfs_warn(fs_info, 47593b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47603b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47613b02a68aSJeff Mahoney kfree(names); 47623b02a68aSJeff Mahoney } else 47630b246afaSJeff Mahoney btrfs_warn(fs_info, 47642eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47652eaa055fSJeff Mahoney type, unsupported); 47662eaa055fSJeff Mahoney return -EOPNOTSUPP; 47672eaa055fSJeff Mahoney } 47682eaa055fSJeff Mahoney 47692eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47702eaa055fSJeff Mahoney if (disallowed) { 47713b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47723b02a68aSJeff Mahoney if (names) { 47730b246afaSJeff Mahoney btrfs_warn(fs_info, 47743b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47753b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47763b02a68aSJeff Mahoney kfree(names); 47773b02a68aSJeff Mahoney } else 47780b246afaSJeff Mahoney btrfs_warn(fs_info, 47792eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47802eaa055fSJeff Mahoney type, disallowed); 47812eaa055fSJeff Mahoney return -EPERM; 47822eaa055fSJeff Mahoney } 47832eaa055fSJeff Mahoney 47842eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47852eaa055fSJeff Mahoney if (disallowed) { 47863b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47873b02a68aSJeff Mahoney if (names) { 47880b246afaSJeff Mahoney btrfs_warn(fs_info, 47893b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47903b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47913b02a68aSJeff Mahoney kfree(names); 47923b02a68aSJeff Mahoney } else 47930b246afaSJeff Mahoney btrfs_warn(fs_info, 47942eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47952eaa055fSJeff Mahoney type, disallowed); 47962eaa055fSJeff Mahoney return -EPERM; 47972eaa055fSJeff Mahoney } 47982eaa055fSJeff Mahoney 47992eaa055fSJeff Mahoney return 0; 48002eaa055fSJeff Mahoney } 48012eaa055fSJeff Mahoney 48022ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 48032ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 48042eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 48052eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 48062eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 48072eaa055fSJeff Mahoney 48082eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 48092eaa055fSJeff Mahoney { 48100b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48120b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48130b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 48142eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 48152eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 48162eaa055fSJeff Mahoney u64 newflags; 48172eaa055fSJeff Mahoney int ret; 48182eaa055fSJeff Mahoney 48192eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 48202eaa055fSJeff Mahoney return -EPERM; 48212eaa055fSJeff Mahoney 48222eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 48232eaa055fSJeff Mahoney return -EFAULT; 48242eaa055fSJeff Mahoney 48252eaa055fSJeff Mahoney /* Nothing to do */ 48262eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48272eaa055fSJeff Mahoney !flags[0].incompat_flags) 48282eaa055fSJeff Mahoney return 0; 48292eaa055fSJeff Mahoney 48302ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 48312eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48322eaa055fSJeff Mahoney if (ret) 48332eaa055fSJeff Mahoney return ret; 48342eaa055fSJeff Mahoney 48352ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48362eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48372eaa055fSJeff Mahoney if (ret) 48382eaa055fSJeff Mahoney return ret; 48392eaa055fSJeff Mahoney 48402ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48412eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48422eaa055fSJeff Mahoney if (ret) 48432eaa055fSJeff Mahoney return ret; 48442eaa055fSJeff Mahoney 48457ab19625SDavid Sterba ret = mnt_want_write_file(file); 48467ab19625SDavid Sterba if (ret) 48477ab19625SDavid Sterba return ret; 48487ab19625SDavid Sterba 48498051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48507ab19625SDavid Sterba if (IS_ERR(trans)) { 48517ab19625SDavid Sterba ret = PTR_ERR(trans); 48527ab19625SDavid Sterba goto out_drop_write; 48537ab19625SDavid Sterba } 48542eaa055fSJeff Mahoney 48550b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48562eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48572eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48582eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48592eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48602eaa055fSJeff Mahoney 48612eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48622eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48632eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48642eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48652eaa055fSJeff Mahoney 48662eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48672eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48682eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48692eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48700b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48712eaa055fSJeff Mahoney 48723a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48737ab19625SDavid Sterba out_drop_write: 48747ab19625SDavid Sterba mnt_drop_write_file(file); 48757ab19625SDavid Sterba 48767ab19625SDavid Sterba return ret; 48772eaa055fSJeff Mahoney } 48782eaa055fSJeff Mahoney 48792351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48802351f431SJosef Bacik { 48812351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48822351f431SJosef Bacik int ret; 48832351f431SJosef Bacik 48842351f431SJosef Bacik if (compat) { 48852351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48862351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48872351f431SJosef Bacik 48882351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48892351f431SJosef Bacik if (ret) 48902351f431SJosef Bacik return -EFAULT; 48912351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48922351f431SJosef Bacik if (!arg) 48932351f431SJosef Bacik return -ENOMEM; 48942351f431SJosef Bacik arg->send_fd = args32.send_fd; 48952351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48962351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48972351f431SJosef Bacik arg->parent_root = args32.parent_root; 48982351f431SJosef Bacik arg->flags = args32.flags; 48992351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 49002351f431SJosef Bacik sizeof(args32.reserved)); 49012351f431SJosef Bacik #else 49022351f431SJosef Bacik return -ENOTTY; 49032351f431SJosef Bacik #endif 49042351f431SJosef Bacik } else { 49052351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 49062351f431SJosef Bacik if (IS_ERR(arg)) 49072351f431SJosef Bacik return PTR_ERR(arg); 49082351f431SJosef Bacik } 49092351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 49102351f431SJosef Bacik kfree(arg); 49112351f431SJosef Bacik return ret; 49122351f431SJosef Bacik } 49132351f431SJosef Bacik 4914f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4915f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4916f46b5a66SChristoph Hellwig { 49170b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49180b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49190b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49204bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4921f46b5a66SChristoph Hellwig 4922f46b5a66SChristoph Hellwig switch (cmd) { 49236cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 49246cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 49256cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 49266cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 49276cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49286cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 492940cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4930b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 493140cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 493240cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4933f7039b1dSLi Dongyang case FITRIM: 4934b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4935f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4936fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4937fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4938fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49393de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4940fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49416f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49426f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 494376dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4944949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4945949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4946949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49470caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49480caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49490caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49500caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49516ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49526ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4953f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49541e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49551e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49561e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4957f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4958198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4959f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49602ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4961f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4962da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49636b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49646b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4965475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49662ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4967475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49682ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4969f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49709ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4971ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4972ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4973cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4974cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4975ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4976ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4977d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4978d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4979d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4980d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4981d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4982d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49831406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49842ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49859b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49869b199859SFilipe David Borba Manana int ret; 49879b199859SFilipe David Borba Manana 49889db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 49899b199859SFilipe David Borba Manana if (ret) 49909b199859SFilipe David Borba Manana return ret; 49910b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49922fad4e83SDavid Sterba /* 49932fad4e83SDavid Sterba * The transaction thread may want to do more work, 499401327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49952fad4e83SDavid Sterba * processing uncleaned subvols. 49962fad4e83SDavid Sterba */ 49970b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49989b199859SFilipe David Borba Manana return ret; 49999b199859SFilipe David Borba Manana } 500046204592SSage Weil case BTRFS_IOC_START_SYNC: 50019a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 500246204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 50032ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 5004475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 5005b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 5006475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 50072ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5008475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 50092ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5010c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 50119ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5012837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 50132ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 501419a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 50152ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 50168ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 50178ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5018abccd00fSHugo Mills #ifdef CONFIG_64BIT 5019abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5020abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5021abccd00fSHugo Mills #endif 502231db9f7cSAlexander Block case BTRFS_IOC_SEND: 50232351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 50242351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50252351f431SJosef Bacik case BTRFS_IOC_SEND_32: 50262351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 50272351f431SJosef Bacik #endif 5028c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 50292ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 50305d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5031905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50325d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5033905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50345d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5035905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50365d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5037905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50382f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50392f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50402f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5041b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 504257254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5043b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50443f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50452ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50462eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5047d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50482eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5049b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50502eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50512eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5052e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5053e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5054025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5055025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5056b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5057b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 505842e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 505942e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 506023d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 506123d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5062f46b5a66SChristoph Hellwig } 5063f46b5a66SChristoph Hellwig 5064f46b5a66SChristoph Hellwig return -ENOTTY; 5065f46b5a66SChristoph Hellwig } 50664c63c245SLuke Dashjr 50674c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50684c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50694c63c245SLuke Dashjr { 50702a362249SJeff Mahoney /* 50712a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50722a362249SJeff Mahoney * handling is necessary. 50732a362249SJeff Mahoney */ 50744c63c245SLuke Dashjr switch (cmd) { 50754c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 50764c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 50774c63c245SLuke Dashjr break; 50784c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 50794c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 50804c63c245SLuke Dashjr break; 50814c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50824c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50834c63c245SLuke Dashjr break; 50844c63c245SLuke Dashjr } 50854c63c245SLuke Dashjr 50864c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50874c63c245SLuke Dashjr } 50884c63c245SLuke Dashjr #endif 5089