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 216bd60ea0fSDavid Sterba if (!inode_owner_or_capable(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 2295955102cSAl Viro inode_lock(inode); 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: 3565955102cSAl Viro inode_unlock(inode); 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 432025f2121SDavid Sterba if (!inode_owner_or_capable(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 452025f2121SDavid Sterba inode_lock(inode); 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 504025f2121SDavid Sterba inode_unlock(inode); 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 /* 531f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 532f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 533f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 534f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 535f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 536f35f06c3SFilipe Manana */ 537f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 538f35f06c3SFilipe Manana return -EROFS; 539f35f06c3SFilipe Manana 5401f78160cSXiao Guangrong rcu_read_lock(); 5411f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5421f78160cSXiao Guangrong dev_list) { 543f7039b1dSLi Dongyang if (!device->bdev) 544f7039b1dSLi Dongyang continue; 545f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 546f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 547f7039b1dSLi Dongyang num_devices++; 54850d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 549f7039b1dSLi Dongyang minlen); 550f7039b1dSLi Dongyang } 551f7039b1dSLi Dongyang } 5521f78160cSXiao Guangrong rcu_read_unlock(); 553f4c697e6SLukas Czerner 554f7039b1dSLi Dongyang if (!num_devices) 555f7039b1dSLi Dongyang return -EOPNOTSUPP; 556f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 557f7039b1dSLi Dongyang return -EFAULT; 5586ba9fc8eSQu Wenruo 5596ba9fc8eSQu Wenruo /* 5606ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5616ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5626ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5636ba9fc8eSQu Wenruo */ 5646ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 565f4c697e6SLukas Czerner return -EINVAL; 566f7039b1dSLi Dongyang 567f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5682ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 569f7039b1dSLi Dongyang if (ret < 0) 570f7039b1dSLi Dongyang return ret; 571f7039b1dSLi Dongyang 572f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 573f7039b1dSLi Dongyang return -EFAULT; 574f7039b1dSLi Dongyang 575f7039b1dSLi Dongyang return 0; 576f7039b1dSLi Dongyang } 577f7039b1dSLi Dongyang 578e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 579dd5f9615SStefan Behrens { 58046e0f66aSChris Mason int i; 58146e0f66aSChris Mason 58246e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 58346e0f66aSChris Mason if (uuid[i]) 58446e0f66aSChris Mason return 0; 58546e0f66aSChris Mason } 58646e0f66aSChris Mason return 1; 587dd5f9615SStefan Behrens } 588dd5f9615SStefan Behrens 589d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 590cb8e7090SChristoph Hellwig struct dentry *dentry, 59152f75f4fSDavid Sterba const char *name, int namelen, 5928696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 593f46b5a66SChristoph Hellwig { 5940b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 595f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 596f46b5a66SChristoph Hellwig struct btrfs_key key; 59749a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 598f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 599f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 600d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 60176dda93cSYan, Zheng struct btrfs_root *new_root; 602d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 60395582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 6045662344bSTsutomu Itoh struct inode *inode; 605f46b5a66SChristoph Hellwig int ret; 606f46b5a66SChristoph Hellwig int err; 6072dfb1e43SQu Wenruo dev_t anon_dev = 0; 608f46b5a66SChristoph Hellwig u64 objectid; 6093de4586cSChris Mason u64 index = 0; 610f46b5a66SChristoph Hellwig 61149a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 61249a3c4d9SDavid Sterba if (!root_item) 61349a3c4d9SDavid Sterba return -ENOMEM; 61449a3c4d9SDavid Sterba 615543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6162fbe8c8aSAl Viro if (ret) 61749a3c4d9SDavid Sterba goto fail_free; 6186a912213SJosef Bacik 6192dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 6202dfb1e43SQu Wenruo if (ret < 0) 6212dfb1e43SQu Wenruo goto fail_free; 6222dfb1e43SQu Wenruo 623e09fe2d2SQu Wenruo /* 624e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 62501327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 626e09fe2d2SQu Wenruo */ 62749a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 62849a3c4d9SDavid Sterba ret = -ENOSPC; 62949a3c4d9SDavid Sterba goto fail_free; 63049a3c4d9SDavid Sterba } 631e09fe2d2SQu Wenruo 632d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6339ed74f2dSJosef Bacik /* 634d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 635d5c12070SMiao Xie * of create_snapshot(). 6369ed74f2dSJosef Bacik */ 637c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 638d5c12070SMiao Xie if (ret) 63949a3c4d9SDavid Sterba goto fail_free; 640f46b5a66SChristoph Hellwig 641d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 642d5c12070SMiao Xie if (IS_ERR(trans)) { 643d5c12070SMiao Xie ret = PTR_ERR(trans); 644e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 64549a3c4d9SDavid Sterba goto fail_free; 646d5c12070SMiao Xie } 647d5c12070SMiao Xie trans->block_rsv = &block_rsv; 648d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 649f46b5a66SChristoph Hellwig 650a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6516f72c7e2SArne Jansen if (ret) 6526f72c7e2SArne Jansen goto fail; 6536f72c7e2SArne Jansen 6549631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6559631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6568e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6578e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6588e8a1e31SJosef Bacik goto fail; 6598e8a1e31SJosef Bacik } 660f46b5a66SChristoph Hellwig 661f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 662f46b5a66SChristoph Hellwig 66349a3c4d9SDavid Sterba inode_item = &root_item->inode; 6643cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6653cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6663cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 667da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6680b246afaSJeff Mahoney fs_info->nodesize); 6693cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 670f46b5a66SChristoph Hellwig 67149a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 67249a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6733cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 67408fe4db1SLi Zefan 67549a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 67649a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 67749a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 67849a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 67949a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68049a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 681f46b5a66SChristoph Hellwig 68249a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 68349a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 684807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 68549a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 68649a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 68749a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 68849a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 68949a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 690f46b5a66SChristoph Hellwig 691925baeddSChris Mason btrfs_tree_unlock(leaf); 692f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 693f46b5a66SChristoph Hellwig leaf = NULL; 694f46b5a66SChristoph Hellwig 695*69948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 696f46b5a66SChristoph Hellwig 697f46b5a66SChristoph Hellwig key.objectid = objectid; 6985d4f98a2SYan Zheng key.offset = 0; 699962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7000b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70149a3c4d9SDavid Sterba root_item); 702f46b5a66SChristoph Hellwig if (ret) 703f46b5a66SChristoph Hellwig goto fail; 704f46b5a66SChristoph Hellwig 70576dda93cSYan, Zheng key.offset = (u64)-1; 7062dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 70779787eaaSJeff Mahoney if (IS_ERR(new_root)) { 7082dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 70979787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 71179787eaaSJeff Mahoney goto fail; 71279787eaaSJeff Mahoney } 7132dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 7142dfb1e43SQu Wenruo anon_dev = 0; 71576dda93cSYan, Zheng 71676dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 71776dda93cSYan, Zheng 718*69948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 71900246528SJosef Bacik btrfs_put_root(new_root); 720ce598979SMark Fasheh if (ret) { 721ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 72266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 723ce598979SMark Fasheh goto fail; 724ce598979SMark Fasheh } 725ce598979SMark Fasheh 726f46b5a66SChristoph Hellwig /* 727f46b5a66SChristoph Hellwig * insert the directory item 728f46b5a66SChristoph Hellwig */ 729877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 73079787eaaSJeff Mahoney if (ret) { 73166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 73279787eaaSJeff Mahoney goto fail; 73379787eaaSJeff Mahoney } 7343de4586cSChris Mason 735684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7363de4586cSChris Mason BTRFS_FT_DIR, index); 73779787eaaSJeff Mahoney if (ret) { 73866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 739f46b5a66SChristoph Hellwig goto fail; 74079787eaaSJeff Mahoney } 7410660b5afSChris Mason 7426ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7439a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 744c7e54b51SJosef Bacik if (ret) { 745c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 746c7e54b51SJosef Bacik goto fail; 747c7e54b51SJosef Bacik } 74852c26179SYan Zheng 7496025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7504a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 751c7e54b51SJosef Bacik if (ret) { 752c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 753c7e54b51SJosef Bacik goto fail; 754c7e54b51SJosef Bacik } 7550660b5afSChris Mason 756cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7576bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 758dd5f9615SStefan Behrens if (ret) 75966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 760dd5f9615SStefan Behrens 761f46b5a66SChristoph Hellwig fail: 76249a3c4d9SDavid Sterba kfree(root_item); 763d5c12070SMiao Xie trans->block_rsv = NULL; 764d5c12070SMiao Xie trans->bytes_reserved = 0; 765e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 766de6e8200SLiu Bo 7673a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 768f46b5a66SChristoph Hellwig if (err && !ret) 769f46b5a66SChristoph Hellwig ret = err; 7701a65e24bSChris Mason 7715662344bSTsutomu Itoh if (!ret) { 7725662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 773de6e8200SLiu Bo if (IS_ERR(inode)) 774de6e8200SLiu Bo return PTR_ERR(inode); 7755662344bSTsutomu Itoh d_instantiate(dentry, inode); 7765662344bSTsutomu Itoh } 777f46b5a66SChristoph Hellwig return ret; 77849a3c4d9SDavid Sterba 77949a3c4d9SDavid Sterba fail_free: 7802dfb1e43SQu Wenruo if (anon_dev) 7812dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 78249a3c4d9SDavid Sterba kfree(root_item); 78349a3c4d9SDavid Sterba return ret; 784f46b5a66SChristoph Hellwig } 785f46b5a66SChristoph Hellwig 786e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7879babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 788e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 789f46b5a66SChristoph Hellwig { 7900b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7912e4bfab9SYan, Zheng struct inode *inode; 792f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 793f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 7942e4bfab9SYan, Zheng int ret; 795f46b5a66SChristoph Hellwig 79692a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 797f46b5a66SChristoph Hellwig return -EINVAL; 798f46b5a66SChristoph Hellwig 799eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 800eede2bf3SOmar Sandoval btrfs_warn(fs_info, 801eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 802eede2bf3SOmar Sandoval return -ETXTBSY; 803eede2bf3SOmar Sandoval } 804eede2bf3SOmar Sandoval 80523269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 806a1ee7362SDavid Sterba if (!pending_snapshot) 807a1ee7362SDavid Sterba return -ENOMEM; 808a1ee7362SDavid Sterba 8092dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8102dfb1e43SQu Wenruo if (ret < 0) 8112dfb1e43SQu Wenruo goto free_pending; 812b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 81323269bf5SDavid Sterba GFP_KERNEL); 8148546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8158546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 816b0c0ea63SDavid Sterba ret = -ENOMEM; 817b0c0ea63SDavid Sterba goto free_pending; 818b0c0ea63SDavid Sterba } 819b0c0ea63SDavid Sterba 82066d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 82166d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 822d5c12070SMiao Xie /* 823d5c12070SMiao Xie * 1 - parent dir inode 824d5c12070SMiao Xie * 2 - dir entries 825d5c12070SMiao Xie * 1 - root item 826d5c12070SMiao Xie * 2 - root ref/backref 827d5c12070SMiao Xie * 1 - root of snapshot 828dd5f9615SStefan Behrens * 1 - UUID item 829d5c12070SMiao Xie */ 830d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 831dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 832ee3441b4SJeff Mahoney false); 833d5c12070SMiao Xie if (ret) 834c11fbb6eSRobbie Ko goto free_pending; 835d5c12070SMiao Xie 836a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 837a22285a6SYan, Zheng pending_snapshot->root = root; 838b83cc969SLi Zefan pending_snapshot->readonly = readonly; 839e9662f70SMiao Xie pending_snapshot->dir = dir; 8408696c533SMiao Xie pending_snapshot->inherit = inherit; 841a22285a6SYan, Zheng 842d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 843a22285a6SYan, Zheng if (IS_ERR(trans)) { 844a22285a6SYan, Zheng ret = PTR_ERR(trans); 845a22285a6SYan, Zheng goto fail; 846a22285a6SYan, Zheng } 847a22285a6SYan, Zheng 8480b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 849a22285a6SYan, Zheng list_add(&pending_snapshot->list, 850a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8510b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8529babda9fSNikolay Borisov 8533a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 854aec8030aSMiao Xie if (ret) 855c37b2b62SJosef Bacik goto fail; 856a22285a6SYan, Zheng 857a22285a6SYan, Zheng ret = pending_snapshot->error; 858f46b5a66SChristoph Hellwig if (ret) 8592e4bfab9SYan, Zheng goto fail; 860f46b5a66SChristoph Hellwig 861d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 862d3797308SChris Mason if (ret) 863d3797308SChris Mason goto fail; 864d3797308SChris Mason 8652b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8662e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8672e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8682e4bfab9SYan, Zheng goto fail; 8692e4bfab9SYan, Zheng } 8705662344bSTsutomu Itoh 8712e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8722e4bfab9SYan, Zheng ret = 0; 8732dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8742e4bfab9SYan, Zheng fail: 8752dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8762dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8772dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 87800246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 879e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 880b0c0ea63SDavid Sterba free_pending: 8812dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8822dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 883b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8848546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 885a1ee7362SDavid Sterba kfree(pending_snapshot); 886a1ee7362SDavid Sterba 887f46b5a66SChristoph Hellwig return ret; 888f46b5a66SChristoph Hellwig } 889f46b5a66SChristoph Hellwig 8904260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8914260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8924260f7c7SSage Weil * whether the type of victim is right. 8934260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 8944260f7c7SSage Weil * 2. We should have write and exec permissions on dir 8954260f7c7SSage Weil * 3. We can't remove anything from append-only dir 8964260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 8974260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 8984260f7c7SSage Weil * a. be owner of dir, or 8994260f7c7SSage Weil * b. be owner of victim, or 9004260f7c7SSage Weil * c. have CAP_FOWNER capability 90101327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 9024260f7c7SSage Weil * links pointing to it. 9034260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 9044260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 9054260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 9064260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9074260f7c7SSage Weil * nfs_async_unlink(). 9084260f7c7SSage Weil */ 9094260f7c7SSage Weil 9104260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9114260f7c7SSage Weil { 9124260f7c7SSage Weil int error; 9134260f7c7SSage Weil 9142b0143b5SDavid Howells if (d_really_is_negative(victim)) 9154260f7c7SSage Weil return -ENOENT; 9164260f7c7SSage Weil 9172b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9184fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9194260f7c7SSage Weil 9204260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9214260f7c7SSage Weil if (error) 9224260f7c7SSage Weil return error; 9234260f7c7SSage Weil if (IS_APPEND(dir)) 9244260f7c7SSage Weil return -EPERM; 9252b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9262b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9274260f7c7SSage Weil return -EPERM; 9284260f7c7SSage Weil if (isdir) { 929e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9304260f7c7SSage Weil return -ENOTDIR; 9314260f7c7SSage Weil if (IS_ROOT(victim)) 9324260f7c7SSage Weil return -EBUSY; 933e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9344260f7c7SSage Weil return -EISDIR; 9354260f7c7SSage Weil if (IS_DEADDIR(dir)) 9364260f7c7SSage Weil return -ENOENT; 9374260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9384260f7c7SSage Weil return -EBUSY; 9394260f7c7SSage Weil return 0; 9404260f7c7SSage Weil } 9414260f7c7SSage Weil 942cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 943cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 944cb8e7090SChristoph Hellwig { 9452b0143b5SDavid Howells if (d_really_is_positive(child)) 946cb8e7090SChristoph Hellwig return -EEXIST; 947cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 948cb8e7090SChristoph Hellwig return -ENOENT; 949cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 950cb8e7090SChristoph Hellwig } 951cb8e7090SChristoph Hellwig 952cb8e7090SChristoph Hellwig /* 953cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 954cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 955cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 956cb8e7090SChristoph Hellwig */ 95792872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 95852f75f4fSDavid Sterba const char *name, int namelen, 95972fd032eSSage Weil struct btrfs_root *snap_src, 9609babda9fSNikolay Borisov bool readonly, 9618696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 962cb8e7090SChristoph Hellwig { 9632b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9640b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 965cb8e7090SChristoph Hellwig struct dentry *dentry; 966cb8e7090SChristoph Hellwig int error; 967cb8e7090SChristoph Hellwig 96800235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 96900235411SAl Viro if (error == -EINTR) 97000235411SAl Viro return error; 971cb8e7090SChristoph Hellwig 972cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 973cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 974cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 975cb8e7090SChristoph Hellwig goto out_unlock; 976cb8e7090SChristoph Hellwig 97776dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 978cb8e7090SChristoph Hellwig if (error) 979a874a63eSLiu Bo goto out_dput; 980cb8e7090SChristoph Hellwig 9819c52057cSChris Mason /* 9829c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9839c52057cSChris Mason * check for them now when we can safely fail 9849c52057cSChris Mason */ 9859c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9869c52057cSChris Mason dir->i_ino, name, 9879c52057cSChris Mason namelen); 9889c52057cSChris Mason if (error) 9899c52057cSChris Mason goto out_dput; 9909c52057cSChris Mason 9910b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 99276dda93cSYan, Zheng 99376dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 99476dda93cSYan, Zheng goto out_up_read; 99576dda93cSYan, Zheng 9969babda9fSNikolay Borisov if (snap_src) 9979babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 9989babda9fSNikolay Borisov else 9999babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 10009babda9fSNikolay Borisov 100176dda93cSYan, Zheng if (!error) 100276dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 100376dda93cSYan, Zheng out_up_read: 10040b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1005cb8e7090SChristoph Hellwig out_dput: 1006cb8e7090SChristoph Hellwig dput(dentry); 1007cb8e7090SChristoph Hellwig out_unlock: 10085955102cSAl Viro inode_unlock(dir); 1009cb8e7090SChristoph Hellwig return error; 1010cb8e7090SChristoph Hellwig } 1011cb8e7090SChristoph Hellwig 1012c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1013c11fbb6eSRobbie Ko const char *name, int namelen, 1014c11fbb6eSRobbie Ko struct btrfs_root *root, 1015c11fbb6eSRobbie Ko bool readonly, 1016c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1017c11fbb6eSRobbie Ko { 1018c11fbb6eSRobbie Ko int ret; 1019c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1020c11fbb6eSRobbie Ko 1021c11fbb6eSRobbie Ko /* 1022c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1023c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1024c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1025c11fbb6eSRobbie Ko */ 1026c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1027c11fbb6eSRobbie Ko 1028c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1029c11fbb6eSRobbie Ko if (ret) 1030c11fbb6eSRobbie Ko goto out; 1031c11fbb6eSRobbie Ko 1032c11fbb6eSRobbie Ko /* 1033c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1034c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1035c11fbb6eSRobbie Ko * creation. 1036c11fbb6eSRobbie Ko */ 1037c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1038c11fbb6eSRobbie Ko snapshot_force_cow = true; 1039c11fbb6eSRobbie Ko 1040c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1041c11fbb6eSRobbie Ko 1042c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1043c11fbb6eSRobbie Ko root, readonly, inherit); 1044c11fbb6eSRobbie Ko out: 1045c11fbb6eSRobbie Ko if (snapshot_force_cow) 1046c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1047c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1048c11fbb6eSRobbie Ko return ret; 1049c11fbb6eSRobbie Ko } 1050c11fbb6eSRobbie Ko 10514cb5300bSChris Mason /* 10524cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10534cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10544cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10554cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10564cb5300bSChris Mason * part of the file 10574cb5300bSChris Mason */ 1058aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10594cb5300bSChris Mason { 10604cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10614cb5300bSChris Mason struct extent_map *em = NULL; 10624cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10634cb5300bSChris Mason u64 end; 10644cb5300bSChris Mason 10654cb5300bSChris Mason read_lock(&em_tree->lock); 106609cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10674cb5300bSChris Mason read_unlock(&em_tree->lock); 10684cb5300bSChris Mason 10694cb5300bSChris Mason if (em) { 10704cb5300bSChris Mason end = extent_map_end(em); 10714cb5300bSChris Mason free_extent_map(em); 10724cb5300bSChris Mason if (end - offset > thresh) 10734cb5300bSChris Mason return 0; 10744cb5300bSChris Mason } 10754cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10764cb5300bSChris Mason thresh /= 2; 10774cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10784cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10794cb5300bSChris Mason if (end >= thresh) 10804cb5300bSChris Mason return 0; 10814cb5300bSChris Mason return 1; 10824cb5300bSChris Mason } 10834cb5300bSChris Mason 10844cb5300bSChris Mason /* 10854cb5300bSChris Mason * helper function to walk through a file and find extents 10864cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10874cb5300bSChris Mason * 10884cb5300bSChris Mason * This is used by the defragging code to find new and small 10894cb5300bSChris Mason * extents 10904cb5300bSChris Mason */ 10914cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10924cb5300bSChris Mason struct inode *inode, u64 newer_than, 1093aab110abSDavid Sterba u64 *off, u32 thresh) 10944cb5300bSChris Mason { 10954cb5300bSChris Mason struct btrfs_path *path; 10964cb5300bSChris Mason struct btrfs_key min_key; 10974cb5300bSChris Mason struct extent_buffer *leaf; 10984cb5300bSChris Mason struct btrfs_file_extent_item *extent; 10994cb5300bSChris Mason int type; 11004cb5300bSChris Mason int ret; 11014a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 11024cb5300bSChris Mason 11034cb5300bSChris Mason path = btrfs_alloc_path(); 11044cb5300bSChris Mason if (!path) 11054cb5300bSChris Mason return -ENOMEM; 11064cb5300bSChris Mason 1107a4689d2bSDavid Sterba min_key.objectid = ino; 11084cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 11094cb5300bSChris Mason min_key.offset = *off; 11104cb5300bSChris Mason 11114cb5300bSChris Mason while (1) { 11126174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 11134cb5300bSChris Mason if (ret != 0) 11144cb5300bSChris Mason goto none; 1115f094c9bdSFilipe Manana process_slot: 1116a4689d2bSDavid Sterba if (min_key.objectid != ino) 11174cb5300bSChris Mason goto none; 11184cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11194cb5300bSChris Mason goto none; 11204cb5300bSChris Mason 11214cb5300bSChris Mason leaf = path->nodes[0]; 11224cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11234cb5300bSChris Mason struct btrfs_file_extent_item); 11244cb5300bSChris Mason 11254cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11264cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11274cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11284cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11294cb5300bSChris Mason *off = min_key.offset; 11304cb5300bSChris Mason btrfs_free_path(path); 11314cb5300bSChris Mason return 0; 11324cb5300bSChris Mason } 11334cb5300bSChris Mason 1134f094c9bdSFilipe Manana path->slots[0]++; 1135f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1136f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1137f094c9bdSFilipe Manana goto process_slot; 1138f094c9bdSFilipe Manana } 1139f094c9bdSFilipe Manana 11404cb5300bSChris Mason if (min_key.offset == (u64)-1) 11414cb5300bSChris Mason goto none; 11424cb5300bSChris Mason 11434cb5300bSChris Mason min_key.offset++; 11444cb5300bSChris Mason btrfs_release_path(path); 11454cb5300bSChris Mason } 11464cb5300bSChris Mason none: 11474cb5300bSChris Mason btrfs_free_path(path); 11484cb5300bSChris Mason return -ENOENT; 11494cb5300bSChris Mason } 11504cb5300bSChris Mason 11516c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 115217ce6ef8SLiu Bo { 115317ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1154940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11556c282eb4SLi Zefan struct extent_map *em; 115609cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1157940100a4SChris Mason 1158940100a4SChris Mason /* 1159940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1160940100a4SChris Mason * the full extent lock 1161940100a4SChris Mason */ 1162940100a4SChris Mason read_lock(&em_tree->lock); 1163940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1164940100a4SChris Mason read_unlock(&em_tree->lock); 1165940100a4SChris Mason 1166940100a4SChris Mason if (!em) { 1167308d9800SFilipe Manana struct extent_state *cached = NULL; 1168308d9800SFilipe Manana u64 end = start + len - 1; 1169308d9800SFilipe Manana 1170940100a4SChris Mason /* get the big lock and read metadata off disk */ 1171ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 117239b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1173e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1174940100a4SChris Mason 11756cf8bfbfSDan Carpenter if (IS_ERR(em)) 11766c282eb4SLi Zefan return NULL; 1177940100a4SChris Mason } 1178940100a4SChris Mason 11796c282eb4SLi Zefan return em; 11806c282eb4SLi Zefan } 11816c282eb4SLi Zefan 11826c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11836c282eb4SLi Zefan { 11846c282eb4SLi Zefan struct extent_map *next; 11856c282eb4SLi Zefan bool ret = true; 11866c282eb4SLi Zefan 11876c282eb4SLi Zefan /* this is the last extent */ 11886c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11896c282eb4SLi Zefan return false; 11906c282eb4SLi Zefan 11916c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1192e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1193e9512d72SChris Mason ret = false; 1194e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1195ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 11966c282eb4SLi Zefan ret = false; 11976c282eb4SLi Zefan 11986c282eb4SLi Zefan free_extent_map(next); 11996c282eb4SLi Zefan return ret; 12006c282eb4SLi Zefan } 12016c282eb4SLi Zefan 1202aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1203a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1204a43a2111SAndrew Mahone int compress) 12056c282eb4SLi Zefan { 12066c282eb4SLi Zefan struct extent_map *em; 12076c282eb4SLi Zefan int ret = 1; 12086c282eb4SLi Zefan bool next_mergeable = true; 12094a3560c4SLiu Bo bool prev_mergeable = true; 12106c282eb4SLi Zefan 12116c282eb4SLi Zefan /* 12126c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 12136c282eb4SLi Zefan * defragging it 12146c282eb4SLi Zefan */ 12156c282eb4SLi Zefan if (start < *defrag_end) 12166c282eb4SLi Zefan return 1; 12176c282eb4SLi Zefan 12186c282eb4SLi Zefan *skip = 0; 12196c282eb4SLi Zefan 12206c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12216c282eb4SLi Zefan if (!em) 12226c282eb4SLi Zefan return 0; 12236c282eb4SLi Zefan 1224940100a4SChris Mason /* this will cover holes, and inline extents */ 122517ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1226940100a4SChris Mason ret = 0; 122717ce6ef8SLiu Bo goto out; 122817ce6ef8SLiu Bo } 122917ce6ef8SLiu Bo 12304a3560c4SLiu Bo if (!*defrag_end) 12314a3560c4SLiu Bo prev_mergeable = false; 12324a3560c4SLiu Bo 12336c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1234940100a4SChris Mason /* 12356c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12366c282eb4SLi Zefan * real extent, don't bother defragging it 1237940100a4SChris Mason */ 1238a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12394a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1240940100a4SChris Mason ret = 0; 124117ce6ef8SLiu Bo out: 1242940100a4SChris Mason /* 1243940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1244940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1245940100a4SChris Mason * so that the next tiny extent will force a defrag. 1246940100a4SChris Mason * 1247940100a4SChris Mason * The end result of this is that tiny extents before a single big 1248940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1249940100a4SChris Mason */ 1250940100a4SChris Mason if (ret) { 1251940100a4SChris Mason *defrag_end = extent_map_end(em); 1252940100a4SChris Mason } else { 1253940100a4SChris Mason *last_len = 0; 1254940100a4SChris Mason *skip = extent_map_end(em); 1255940100a4SChris Mason *defrag_end = 0; 1256940100a4SChris Mason } 1257940100a4SChris Mason 1258940100a4SChris Mason free_extent_map(em); 1259940100a4SChris Mason return ret; 1260940100a4SChris Mason } 1261940100a4SChris Mason 12624cb5300bSChris Mason /* 12634cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12644cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12654cb5300bSChris Mason * to COW and defrag. 12664cb5300bSChris Mason * 12674cb5300bSChris Mason * It also makes sure the delalloc code has enough 12684cb5300bSChris Mason * dirty data to avoid making new small extents as part 12694cb5300bSChris Mason * of the defrag 12704cb5300bSChris Mason * 12714cb5300bSChris Mason * It's a good idea to start RA on this range 12724cb5300bSChris Mason * before calling this. 12734cb5300bSChris Mason */ 12744cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12754cb5300bSChris Mason struct page **pages, 12764cb5300bSChris Mason unsigned long start_index, 1277c41570c9SJustin Maggard unsigned long num_pages) 1278f46b5a66SChristoph Hellwig { 12794cb5300bSChris Mason unsigned long file_end; 12804cb5300bSChris Mason u64 isize = i_size_read(inode); 1281f46b5a66SChristoph Hellwig u64 page_start; 1282f46b5a66SChristoph Hellwig u64 page_end; 12831f12bd06SLiu Bo u64 page_cnt; 1284a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 12857f458a38SFilipe Manana u64 search_start; 12864cb5300bSChris Mason int ret; 12874cb5300bSChris Mason int i; 12884cb5300bSChris Mason int i_done; 12894cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12904cb5300bSChris Mason struct extent_state *cached_state = NULL; 1291600a45e1SMiao Xie struct extent_io_tree *tree; 1292364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12933b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 12944cb5300bSChris Mason 129509cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 12961f12bd06SLiu Bo if (!isize || start_index > file_end) 12971f12bd06SLiu Bo return 0; 12981f12bd06SLiu Bo 12991f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13004cb5300bSChris Mason 1301e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1302a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13034cb5300bSChris Mason if (ret) 13044cb5300bSChris Mason return ret; 13054cb5300bSChris Mason i_done = 0; 1306600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 13074cb5300bSChris Mason 13084cb5300bSChris Mason /* step one, lock all the pages */ 13091f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13104cb5300bSChris Mason struct page *page; 1311600a45e1SMiao Xie again: 1312a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 13133b16a4e3SJosef Bacik start_index + i, mask); 13144cb5300bSChris Mason if (!page) 13154cb5300bSChris Mason break; 13164cb5300bSChris Mason 1317600a45e1SMiao Xie page_start = page_offset(page); 131809cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1319600a45e1SMiao Xie while (1) { 1320308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1321ff13db41SDavid Sterba &cached_state); 1322c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1323600a45e1SMiao Xie page_start); 1324308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1325e43bbe5eSDavid Sterba &cached_state); 1326600a45e1SMiao Xie if (!ordered) 1327600a45e1SMiao Xie break; 1328600a45e1SMiao Xie 1329600a45e1SMiao Xie unlock_page(page); 1330c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1331600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1332600a45e1SMiao Xie lock_page(page); 13331f12bd06SLiu Bo /* 13341f12bd06SLiu Bo * we unlocked the page above, so we need check if 13351f12bd06SLiu Bo * it was released or not. 13361f12bd06SLiu Bo */ 13371f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13381f12bd06SLiu Bo unlock_page(page); 133909cbfeafSKirill A. Shutemov put_page(page); 13401f12bd06SLiu Bo goto again; 13411f12bd06SLiu Bo } 1342600a45e1SMiao Xie } 1343600a45e1SMiao Xie 13444cb5300bSChris Mason if (!PageUptodate(page)) { 13454cb5300bSChris Mason btrfs_readpage(NULL, page); 13464cb5300bSChris Mason lock_page(page); 13474cb5300bSChris Mason if (!PageUptodate(page)) { 13484cb5300bSChris Mason unlock_page(page); 134909cbfeafSKirill A. Shutemov put_page(page); 13504cb5300bSChris Mason ret = -EIO; 13514cb5300bSChris Mason break; 13524cb5300bSChris Mason } 13534cb5300bSChris Mason } 1354600a45e1SMiao Xie 1355600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1356600a45e1SMiao Xie unlock_page(page); 135709cbfeafSKirill A. Shutemov put_page(page); 1358600a45e1SMiao Xie goto again; 1359600a45e1SMiao Xie } 1360600a45e1SMiao Xie 13614cb5300bSChris Mason pages[i] = page; 13624cb5300bSChris Mason i_done++; 13634cb5300bSChris Mason } 13644cb5300bSChris Mason if (!i_done || ret) 13654cb5300bSChris Mason goto out; 13664cb5300bSChris Mason 13671751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13684cb5300bSChris Mason goto out; 13694cb5300bSChris Mason 13704cb5300bSChris Mason /* 13714cb5300bSChris Mason * so now we have a nice long stream of locked 13724cb5300bSChris Mason * and up to date pages, lets wait on them 13734cb5300bSChris Mason */ 13744cb5300bSChris Mason for (i = 0; i < i_done; i++) 13754cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13764cb5300bSChris Mason 13774cb5300bSChris Mason page_start = page_offset(pages[0]); 137809cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13794cb5300bSChris Mason 13804cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1381ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13827f458a38SFilipe Manana 13837f458a38SFilipe Manana /* 13847f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 13857f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 13867f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 13877f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 13887f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 13897f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 13907f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 13917f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 13927f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 13937f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 13947f458a38SFilipe Manana * out if that happened. 13957f458a38SFilipe Manana */ 13967f458a38SFilipe Manana search_start = page_start; 13977f458a38SFilipe Manana while (search_start < page_end) { 13987f458a38SFilipe Manana struct extent_map *em; 13997f458a38SFilipe Manana 14007f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 14017f458a38SFilipe Manana page_end - search_start); 14027f458a38SFilipe Manana if (IS_ERR(em)) { 14037f458a38SFilipe Manana ret = PTR_ERR(em); 14047f458a38SFilipe Manana goto out_unlock_range; 14057f458a38SFilipe Manana } 14067f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 14077f458a38SFilipe Manana free_extent_map(em); 14087f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 14097f458a38SFilipe Manana ret = 0; 14107f458a38SFilipe Manana goto out_unlock_range; 14117f458a38SFilipe Manana } 14127f458a38SFilipe Manana search_start = extent_map_end(em); 14137f458a38SFilipe Manana free_extent_map(em); 14147f458a38SFilipe Manana } 14157f458a38SFilipe Manana 14164cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1417e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1418e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 14194cb5300bSChris Mason 14201f12bd06SLiu Bo if (i_done != page_cnt) { 14219e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 142228c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 14239e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 142486d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1425a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 14264cb5300bSChris Mason } 14274cb5300bSChris Mason 14284cb5300bSChris Mason 14299e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1430018ed4f7SDavid Sterba &cached_state); 14314cb5300bSChris Mason 14324cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1433e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14344cb5300bSChris Mason 14354cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14364cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14374cb5300bSChris Mason ClearPageChecked(pages[i]); 14384cb5300bSChris Mason set_page_extent_mapped(pages[i]); 14394cb5300bSChris Mason set_page_dirty(pages[i]); 14404cb5300bSChris Mason unlock_page(pages[i]); 144109cbfeafSKirill A. Shutemov put_page(pages[i]); 14424cb5300bSChris Mason } 14438702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1444364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14454cb5300bSChris Mason return i_done; 14467f458a38SFilipe Manana 14477f458a38SFilipe Manana out_unlock_range: 14487f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14497f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14504cb5300bSChris Mason out: 14514cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14524cb5300bSChris Mason unlock_page(pages[i]); 145309cbfeafSKirill A. Shutemov put_page(pages[i]); 14544cb5300bSChris Mason } 145586d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1456a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14578702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1458364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14594cb5300bSChris Mason return ret; 14604cb5300bSChris Mason 14614cb5300bSChris Mason } 14624cb5300bSChris Mason 14634cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14644cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14654cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14664cb5300bSChris Mason { 14670b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14684cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14694cb5300bSChris Mason struct file_ra_state *ra = NULL; 14704cb5300bSChris Mason unsigned long last_index; 1471151a31b2SLi Zefan u64 isize = i_size_read(inode); 1472940100a4SChris Mason u64 last_len = 0; 1473940100a4SChris Mason u64 skip = 0; 1474940100a4SChris Mason u64 defrag_end = 0; 14754cb5300bSChris Mason u64 newer_off = range->start; 1476f46b5a66SChristoph Hellwig unsigned long i; 1477008873eaSLi Zefan unsigned long ra_index = 0; 1478f46b5a66SChristoph Hellwig int ret; 14794cb5300bSChris Mason int defrag_count = 0; 14801a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1481aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 148209cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1483c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1484ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14854cb5300bSChris Mason struct page **pages = NULL; 14861e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14874cb5300bSChris Mason 14880abd5b17SLiu Bo if (isize == 0) 14890abd5b17SLiu Bo return 0; 14900abd5b17SLiu Bo 14910abd5b17SLiu Bo if (range->start >= isize) 14920abd5b17SLiu Bo return -EINVAL; 14931a419d85SLi Zefan 14941e2ef46dSDavid Sterba if (do_compress) { 1495ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 14961a419d85SLi Zefan return -EINVAL; 14971a419d85SLi Zefan if (range->compress_type) 14981a419d85SLi Zefan compress_type = range->compress_type; 14991a419d85SLi Zefan } 1500f46b5a66SChristoph Hellwig 15010abd5b17SLiu Bo if (extent_thresh == 0) 1502ee22184bSByongho Lee extent_thresh = SZ_256K; 1503f46b5a66SChristoph Hellwig 15044cb5300bSChris Mason /* 15050a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 15060a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 15070a52d108SDavid Sterba * we don't error out. 15084cb5300bSChris Mason */ 15094cb5300bSChris Mason if (!file) { 151063e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 15110a52d108SDavid Sterba if (ra) 15124cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 15134cb5300bSChris Mason } else { 15144cb5300bSChris Mason ra = &file->f_ra; 15154cb5300bSChris Mason } 15164cb5300bSChris Mason 151763e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 15184cb5300bSChris Mason if (!pages) { 15194cb5300bSChris Mason ret = -ENOMEM; 15204cb5300bSChris Mason goto out_ra; 15214cb5300bSChris Mason } 15224cb5300bSChris Mason 15234cb5300bSChris Mason /* find the last page to defrag */ 15241e701a32SChris Mason if (range->start + range->len > range->start) { 1525151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 152609cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 15271e701a32SChris Mason } else { 152809cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 15291e701a32SChris Mason } 15301e701a32SChris Mason 15314cb5300bSChris Mason if (newer_than) { 15324cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1533ee22184bSByongho Lee &newer_off, SZ_64K); 15344cb5300bSChris Mason if (!ret) { 15354cb5300bSChris Mason range->start = newer_off; 15364cb5300bSChris Mason /* 15374cb5300bSChris Mason * we always align our defrag to help keep 15384cb5300bSChris Mason * the extents in the file evenly spaced 15394cb5300bSChris Mason */ 154009cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15414cb5300bSChris Mason } else 15424cb5300bSChris Mason goto out_ra; 15434cb5300bSChris Mason } else { 154409cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 15454cb5300bSChris Mason } 15464cb5300bSChris Mason if (!max_to_defrag) 1547070034bdSchandan max_to_defrag = last_index - i + 1; 15484cb5300bSChris Mason 15492a0f7f57SLi Zefan /* 15502a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 15512a0f7f57SLi Zefan * written sequentially. 15522a0f7f57SLi Zefan */ 15532a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 15542a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 15552a0f7f57SLi Zefan 1556f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 155709cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15584cb5300bSChris Mason /* 15594cb5300bSChris Mason * make sure we stop running if someone unmounts 15604cb5300bSChris Mason * the FS 15614cb5300bSChris Mason */ 15621751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15634cb5300bSChris Mason break; 15644cb5300bSChris Mason 15650b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15660b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1567210549ebSDavid Sterba ret = -EAGAIN; 1568210549ebSDavid Sterba break; 1569210549ebSDavid Sterba } 1570210549ebSDavid Sterba 157109cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15726c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15731e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1574940100a4SChris Mason unsigned long next; 1575940100a4SChris Mason /* 1576940100a4SChris Mason * the should_defrag function tells us how much to skip 1577940100a4SChris Mason * bump our counter by the suggested amount 1578940100a4SChris Mason */ 157909cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1580940100a4SChris Mason i = max(i + 1, next); 1581940100a4SChris Mason continue; 1582940100a4SChris Mason } 1583008873eaSLi Zefan 1584008873eaSLi Zefan if (!newer_than) { 158509cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 158609cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1587008873eaSLi Zefan cluster = min(cluster, max_cluster); 1588008873eaSLi Zefan } else { 1589008873eaSLi Zefan cluster = max_cluster; 1590008873eaSLi Zefan } 1591008873eaSLi Zefan 1592008873eaSLi Zefan if (i + cluster > ra_index) { 1593008873eaSLi Zefan ra_index = max(i, ra_index); 15940a52d108SDavid Sterba if (ra) 1595d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1596d3c0bab5SDavid Sterba file, ra_index, cluster); 1597e4826a5bSchandan ra_index += cluster; 1598008873eaSLi Zefan } 15994cb5300bSChris Mason 16005955102cSAl Viro inode_lock(inode); 1601eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1602eede2bf3SOmar Sandoval ret = -ETXTBSY; 1603eede2bf3SOmar Sandoval } else { 16041e2ef46dSDavid Sterba if (do_compress) 1605eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1606008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1607eede2bf3SOmar Sandoval } 1608ecb8bea8SLiu Bo if (ret < 0) { 16095955102cSAl Viro inode_unlock(inode); 16104cb5300bSChris Mason goto out_ra; 1611ecb8bea8SLiu Bo } 16124cb5300bSChris Mason 16134cb5300bSChris Mason defrag_count += ret; 1614d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 16155955102cSAl Viro inode_unlock(inode); 16164cb5300bSChris Mason 16174cb5300bSChris Mason if (newer_than) { 16184cb5300bSChris Mason if (newer_off == (u64)-1) 16194cb5300bSChris Mason break; 16204cb5300bSChris Mason 1621e1f041e1SLiu Bo if (ret > 0) 1622e1f041e1SLiu Bo i += ret; 1623e1f041e1SLiu Bo 16244cb5300bSChris Mason newer_off = max(newer_off + 1, 162509cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 16264cb5300bSChris Mason 1627ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1628ee22184bSByongho Lee &newer_off, SZ_64K); 16294cb5300bSChris Mason if (!ret) { 16304cb5300bSChris Mason range->start = newer_off; 163109cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16324cb5300bSChris Mason } else { 16334cb5300bSChris Mason break; 1634940100a4SChris Mason } 16354cb5300bSChris Mason } else { 1636008873eaSLi Zefan if (ret > 0) { 1637cbcc8326SLi Zefan i += ret; 163809cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1639008873eaSLi Zefan } else { 1640940100a4SChris Mason i++; 1641008873eaSLi Zefan last_len = 0; 1642008873eaSLi Zefan } 1643f46b5a66SChristoph Hellwig } 16444cb5300bSChris Mason } 1645f46b5a66SChristoph Hellwig 1646dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 16471e701a32SChris Mason filemap_flush(inode->i_mapping); 1648dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1649dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1650dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1651dec8ef90SFilipe Manana } 16521e701a32SChris Mason 16531a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 16540b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16555c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16565c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16571a419d85SLi Zefan } 16581a419d85SLi Zefan 165960ccf82fSDiego Calleja ret = defrag_count; 1660940100a4SChris Mason 16614cb5300bSChris Mason out_ra: 16621e2ef46dSDavid Sterba if (do_compress) { 16635955102cSAl Viro inode_lock(inode); 1664eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 16655955102cSAl Viro inode_unlock(inode); 1666633085c7SFilipe David Borba Manana } 16674cb5300bSChris Mason if (!file) 16684cb5300bSChris Mason kfree(ra); 16694cb5300bSChris Mason kfree(pages); 1670940100a4SChris Mason return ret; 1671f46b5a66SChristoph Hellwig } 1672f46b5a66SChristoph Hellwig 1673198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 167476dda93cSYan, Zheng void __user *arg) 1675f46b5a66SChristoph Hellwig { 16760b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16770b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1678f46b5a66SChristoph Hellwig u64 new_size; 1679f46b5a66SChristoph Hellwig u64 old_size; 1680f46b5a66SChristoph Hellwig u64 devid = 1; 16810b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1682f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1683f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1684f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1685f46b5a66SChristoph Hellwig char *sizestr; 16869a40f122SGui Hecheng char *retptr; 1687f46b5a66SChristoph Hellwig char *devstr = NULL; 1688f46b5a66SChristoph Hellwig int ret = 0; 1689f46b5a66SChristoph Hellwig int mod = 0; 1690f46b5a66SChristoph Hellwig 1691e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1692e441d54dSChris Mason return -EPERM; 1693e441d54dSChris Mason 1694198605a8SMiao Xie ret = mnt_want_write_file(file); 1695198605a8SMiao Xie if (ret) 1696198605a8SMiao Xie return ret; 1697198605a8SMiao Xie 1698c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 169997547676SMiao Xie mnt_drop_write_file(file); 1700e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1701c9e9f97bSIlya Dryomov } 1702c9e9f97bSIlya Dryomov 1703dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1704c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1705c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1706c9e9f97bSIlya Dryomov goto out; 1707c9e9f97bSIlya Dryomov } 17085516e595SMark Fasheh 17095516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1710f46b5a66SChristoph Hellwig 1711f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1712f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1713f46b5a66SChristoph Hellwig if (devstr) { 1714f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1715f46b5a66SChristoph Hellwig *devstr = '\0'; 1716f46b5a66SChristoph Hellwig devstr = vol_args->name; 171758dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 171858dfae63SZhangZhen if (ret) 171958dfae63SZhangZhen goto out_free; 1720dfd79829SMiao Xie if (!devid) { 1721dfd79829SMiao Xie ret = -EINVAL; 1722dfd79829SMiao Xie goto out_free; 1723dfd79829SMiao Xie } 17240b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1725f46b5a66SChristoph Hellwig } 1726dba60f3fSMiao Xie 1727b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1728f46b5a66SChristoph Hellwig if (!device) { 17290b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1730c1c9ff7cSGeert Uytterhoeven devid); 1731dfd79829SMiao Xie ret = -ENODEV; 1732c9e9f97bSIlya Dryomov goto out_free; 1733f46b5a66SChristoph Hellwig } 1734dba60f3fSMiao Xie 1735ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17360b246afaSJeff Mahoney btrfs_info(fs_info, 1737efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1738c1c9ff7cSGeert Uytterhoeven devid); 1739dfd79829SMiao Xie ret = -EPERM; 17404e42ae1bSLiu Bo goto out_free; 17414e42ae1bSLiu Bo } 17424e42ae1bSLiu Bo 1743f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1744f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1745f46b5a66SChristoph Hellwig else { 1746f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1747f46b5a66SChristoph Hellwig mod = -1; 1748f46b5a66SChristoph Hellwig sizestr++; 1749f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1750f46b5a66SChristoph Hellwig mod = 1; 1751f46b5a66SChristoph Hellwig sizestr++; 1752f46b5a66SChristoph Hellwig } 17539a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17549a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1755f46b5a66SChristoph Hellwig ret = -EINVAL; 1756c9e9f97bSIlya Dryomov goto out_free; 1757f46b5a66SChristoph Hellwig } 1758f46b5a66SChristoph Hellwig } 1759f46b5a66SChristoph Hellwig 1760401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1761dfd79829SMiao Xie ret = -EPERM; 176263a212abSStefan Behrens goto out_free; 176363a212abSStefan Behrens } 176463a212abSStefan Behrens 17657cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1766f46b5a66SChristoph Hellwig 1767f46b5a66SChristoph Hellwig if (mod < 0) { 1768f46b5a66SChristoph Hellwig if (new_size > old_size) { 1769f46b5a66SChristoph Hellwig ret = -EINVAL; 1770c9e9f97bSIlya Dryomov goto out_free; 1771f46b5a66SChristoph Hellwig } 1772f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1773f46b5a66SChristoph Hellwig } else if (mod > 0) { 1774eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1775902c68a4SGui Hecheng ret = -ERANGE; 1776eb8052e0SWenliang Fan goto out_free; 1777eb8052e0SWenliang Fan } 1778f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1779f46b5a66SChristoph Hellwig } 1780f46b5a66SChristoph Hellwig 1781ee22184bSByongho Lee if (new_size < SZ_256M) { 1782f46b5a66SChristoph Hellwig ret = -EINVAL; 1783c9e9f97bSIlya Dryomov goto out_free; 1784f46b5a66SChristoph Hellwig } 1785f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1786f46b5a66SChristoph Hellwig ret = -EFBIG; 1787c9e9f97bSIlya Dryomov goto out_free; 1788f46b5a66SChristoph Hellwig } 1789f46b5a66SChristoph Hellwig 179047f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1791f46b5a66SChristoph Hellwig 1792f46b5a66SChristoph Hellwig if (new_size > old_size) { 1793a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 179498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 179598d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1796c9e9f97bSIlya Dryomov goto out_free; 179798d5dc13STsutomu Itoh } 1798f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 17993a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1800ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1801f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 18020253f40eSjeff.liu } /* equal, nothing need to do */ 1803f46b5a66SChristoph Hellwig 1804faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1805faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1806faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1807faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1808faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1809c9e9f97bSIlya Dryomov out_free: 1810f46b5a66SChristoph Hellwig kfree(vol_args); 1811c9e9f97bSIlya Dryomov out: 1812c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 181318f39c41SIlya Dryomov mnt_drop_write_file(file); 1814f46b5a66SChristoph Hellwig return ret; 1815f46b5a66SChristoph Hellwig } 1816f46b5a66SChristoph Hellwig 18175d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 181852f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18195d54c67eSNikolay Borisov bool readonly, 18208696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1821f46b5a66SChristoph Hellwig { 1822f46b5a66SChristoph Hellwig int namelen; 18233de4586cSChris Mason int ret = 0; 1824f46b5a66SChristoph Hellwig 1825325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1826325c50e3SJeff Mahoney return -ENOTDIR; 1827325c50e3SJeff Mahoney 1828a874a63eSLiu Bo ret = mnt_want_write_file(file); 1829a874a63eSLiu Bo if (ret) 1830a874a63eSLiu Bo goto out; 1831a874a63eSLiu Bo 183272fd032eSSage Weil namelen = strlen(name); 183372fd032eSSage Weil if (strchr(name, '/')) { 1834f46b5a66SChristoph Hellwig ret = -EINVAL; 1835a874a63eSLiu Bo goto out_drop_write; 1836f46b5a66SChristoph Hellwig } 1837f46b5a66SChristoph Hellwig 183816780cabSChris Mason if (name[0] == '.' && 183916780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 184016780cabSChris Mason ret = -EEXIST; 1841a874a63eSLiu Bo goto out_drop_write; 184216780cabSChris Mason } 184316780cabSChris Mason 18443de4586cSChris Mason if (subvol) { 184572fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18465d54c67eSNikolay Borisov NULL, readonly, inherit); 1847cb8e7090SChristoph Hellwig } else { 18482903ff01SAl Viro struct fd src = fdget(fd); 18493de4586cSChris Mason struct inode *src_inode; 18502903ff01SAl Viro if (!src.file) { 18513de4586cSChris Mason ret = -EINVAL; 1852a874a63eSLiu Bo goto out_drop_write; 18533de4586cSChris Mason } 18543de4586cSChris Mason 1855496ad9aaSAl Viro src_inode = file_inode(src.file); 1856496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1857c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1858efe120a0SFrank Holton "Snapshot src from another FS"); 185923ad5b17SKusanagi Kouichi ret = -EXDEV; 1860d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1861d0242061SDavid Sterba /* 1862d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1863d0242061SDavid Sterba * are limited to own subvolumes only 1864d0242061SDavid Sterba */ 1865d0242061SDavid Sterba ret = -EPERM; 1866ecd18815SAl Viro } else { 1867c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 186872fd032eSSage Weil BTRFS_I(src_inode)->root, 18695d54c67eSNikolay Borisov readonly, inherit); 1870ecd18815SAl Viro } 18712903ff01SAl Viro fdput(src); 1872cb8e7090SChristoph Hellwig } 1873a874a63eSLiu Bo out_drop_write: 1874a874a63eSLiu Bo mnt_drop_write_file(file); 1875f46b5a66SChristoph Hellwig out: 187672fd032eSSage Weil return ret; 187772fd032eSSage Weil } 187872fd032eSSage Weil 187972fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1880fa0d2b9bSLi Zefan void __user *arg, int subvol) 188172fd032eSSage Weil { 1882fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 188372fd032eSSage Weil int ret; 188472fd032eSSage Weil 1885325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1886325c50e3SJeff Mahoney return -ENOTDIR; 1887325c50e3SJeff Mahoney 1888fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1889fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1890fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1891fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1892fa0d2b9bSLi Zefan 18935d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 18945d54c67eSNikolay Borisov subvol, false, NULL); 1895fa0d2b9bSLi Zefan 1896fa0d2b9bSLi Zefan kfree(vol_args); 1897fa0d2b9bSLi Zefan return ret; 1898fa0d2b9bSLi Zefan } 1899fa0d2b9bSLi Zefan 1900fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1901fa0d2b9bSLi Zefan void __user *arg, int subvol) 1902fa0d2b9bSLi Zefan { 1903fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1904fa0d2b9bSLi Zefan int ret; 1905b83cc969SLi Zefan bool readonly = false; 19066f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 190772fd032eSSage Weil 1908325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1909325c50e3SJeff Mahoney return -ENOTDIR; 1910325c50e3SJeff Mahoney 1911fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1912fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1913fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1914fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1915fdfb1e4fSLi Zefan 1916673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1917b83cc969SLi Zefan ret = -EOPNOTSUPP; 1918c47ca32dSDan Carpenter goto free_args; 1919fdfb1e4fSLi Zefan } 1920fdfb1e4fSLi Zefan 1921b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1922b83cc969SLi Zefan readonly = true; 19236f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 192409cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 19256f72c7e2SArne Jansen ret = -EINVAL; 1926c47ca32dSDan Carpenter goto free_args; 19276f72c7e2SArne Jansen } 19286f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19296f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19306f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1931c47ca32dSDan Carpenter goto free_args; 19326f72c7e2SArne Jansen } 19336f72c7e2SArne Jansen } 193475eaa0e2SSage Weil 19355d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19365d54c67eSNikolay Borisov subvol, readonly, inherit); 1937c47ca32dSDan Carpenter if (ret) 1938c47ca32dSDan Carpenter goto free_inherit; 1939c47ca32dSDan Carpenter free_inherit: 19406f72c7e2SArne Jansen kfree(inherit); 1941c47ca32dSDan Carpenter free_args: 1942c47ca32dSDan Carpenter kfree(vol_args); 1943f46b5a66SChristoph Hellwig return ret; 1944f46b5a66SChristoph Hellwig } 1945f46b5a66SChristoph Hellwig 19460caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19470caa102dSLi Zefan void __user *arg) 19480caa102dSLi Zefan { 1949496ad9aaSAl Viro struct inode *inode = file_inode(file); 19500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19510caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19520caa102dSLi Zefan int ret = 0; 19530caa102dSLi Zefan u64 flags = 0; 19540caa102dSLi Zefan 19554a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19560caa102dSLi Zefan return -EINVAL; 19570caa102dSLi Zefan 19580b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19590caa102dSLi Zefan if (btrfs_root_readonly(root)) 19600caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19610b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19620caa102dSLi Zefan 19630caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19640caa102dSLi Zefan ret = -EFAULT; 19650caa102dSLi Zefan 19660caa102dSLi Zefan return ret; 19670caa102dSLi Zefan } 19680caa102dSLi Zefan 19690caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19700caa102dSLi Zefan void __user *arg) 19710caa102dSLi Zefan { 1972496ad9aaSAl Viro struct inode *inode = file_inode(file); 19730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19740caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19750caa102dSLi Zefan struct btrfs_trans_handle *trans; 19760caa102dSLi Zefan u64 root_flags; 19770caa102dSLi Zefan u64 flags; 19780caa102dSLi Zefan int ret = 0; 19790caa102dSLi Zefan 1980bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1981bd60ea0fSDavid Sterba return -EPERM; 1982bd60ea0fSDavid Sterba 1983b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1984b9ca0664SLiu Bo if (ret) 1985b9ca0664SLiu Bo goto out; 19860caa102dSLi Zefan 19874a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1988b9ca0664SLiu Bo ret = -EINVAL; 1989b9ca0664SLiu Bo goto out_drop_write; 1990b9ca0664SLiu Bo } 19910caa102dSLi Zefan 1992b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1993b9ca0664SLiu Bo ret = -EFAULT; 1994b9ca0664SLiu Bo goto out_drop_write; 1995b9ca0664SLiu Bo } 19960caa102dSLi Zefan 1997b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 1998b9ca0664SLiu Bo ret = -EOPNOTSUPP; 1999b9ca0664SLiu Bo goto out_drop_write; 2000b9ca0664SLiu Bo } 20010caa102dSLi Zefan 20020b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20030caa102dSLi Zefan 20040caa102dSLi Zefan /* nothing to do */ 20050caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2006b9ca0664SLiu Bo goto out_drop_sem; 20070caa102dSLi Zefan 20080caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20092c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20100caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20110caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20122c686537SDavid Sterba } else { 20132c686537SDavid Sterba /* 20142c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20152c686537SDavid Sterba * send 20162c686537SDavid Sterba */ 20172c686537SDavid Sterba spin_lock(&root->root_item_lock); 20182c686537SDavid Sterba if (root->send_in_progress == 0) { 20190caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20200caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20212c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20222c686537SDavid Sterba } else { 20232c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20240b246afaSJeff Mahoney btrfs_warn(fs_info, 20252c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20262c686537SDavid Sterba root->root_key.objectid); 20272c686537SDavid Sterba ret = -EPERM; 20282c686537SDavid Sterba goto out_drop_sem; 20292c686537SDavid Sterba } 20302c686537SDavid Sterba } 20310caa102dSLi Zefan 20320caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20330caa102dSLi Zefan if (IS_ERR(trans)) { 20340caa102dSLi Zefan ret = PTR_ERR(trans); 20350caa102dSLi Zefan goto out_reset; 20360caa102dSLi Zefan } 20370caa102dSLi Zefan 20380b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20390caa102dSLi Zefan &root->root_key, &root->root_item); 20409417ebc8SNikolay Borisov if (ret < 0) { 20419417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20429417ebc8SNikolay Borisov goto out_reset; 20439417ebc8SNikolay Borisov } 20440caa102dSLi Zefan 20459417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20469417ebc8SNikolay Borisov 20470caa102dSLi Zefan out_reset: 20480caa102dSLi Zefan if (ret) 20490caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2050b9ca0664SLiu Bo out_drop_sem: 20510b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2052b9ca0664SLiu Bo out_drop_write: 2053b9ca0664SLiu Bo mnt_drop_write_file(file); 2054b9ca0664SLiu Bo out: 20550caa102dSLi Zefan return ret; 20560caa102dSLi Zefan } 20570caa102dSLi Zefan 2058ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2059ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2060ac8e9819SChris Mason { 2061abc6e134SChris Mason struct btrfs_key test; 2062abc6e134SChris Mason int ret; 2063abc6e134SChris Mason 2064abc6e134SChris Mason test.objectid = sk->min_objectid; 2065abc6e134SChris Mason test.type = sk->min_type; 2066abc6e134SChris Mason test.offset = sk->min_offset; 2067abc6e134SChris Mason 2068abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2069abc6e134SChris Mason if (ret < 0) 2070ac8e9819SChris Mason return 0; 2071abc6e134SChris Mason 2072abc6e134SChris Mason test.objectid = sk->max_objectid; 2073abc6e134SChris Mason test.type = sk->max_type; 2074abc6e134SChris Mason test.offset = sk->max_offset; 2075abc6e134SChris Mason 2076abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2077abc6e134SChris Mason if (ret > 0) 2078ac8e9819SChris Mason return 0; 2079ac8e9819SChris Mason return 1; 2080ac8e9819SChris Mason } 2081ac8e9819SChris Mason 2082df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2083ac8e9819SChris Mason struct btrfs_key *key, 2084ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20859b6e817dSGerhard Heift size_t *buf_size, 2086ba346b35SGerhard Heift char __user *ubuf, 2087ac8e9819SChris Mason unsigned long *sk_offset, 2088ac8e9819SChris Mason int *num_found) 2089ac8e9819SChris Mason { 2090ac8e9819SChris Mason u64 found_transid; 2091ac8e9819SChris Mason struct extent_buffer *leaf; 2092ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2093dd81d459SNaohiro Aota struct btrfs_key test; 2094ac8e9819SChris Mason unsigned long item_off; 2095ac8e9819SChris Mason unsigned long item_len; 2096ac8e9819SChris Mason int nritems; 2097ac8e9819SChris Mason int i; 2098ac8e9819SChris Mason int slot; 2099ac8e9819SChris Mason int ret = 0; 2100ac8e9819SChris Mason 2101ac8e9819SChris Mason leaf = path->nodes[0]; 2102ac8e9819SChris Mason slot = path->slots[0]; 2103ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2104ac8e9819SChris Mason 2105ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2106ac8e9819SChris Mason i = nritems; 2107ac8e9819SChris Mason goto advance_key; 2108ac8e9819SChris Mason } 2109ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2110ac8e9819SChris Mason 2111ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2112ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2113ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2114ac8e9819SChris Mason 211503b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 211603b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 211703b71c6cSGabriel de Perthuis continue; 211803b71c6cSGabriel de Perthuis 21199b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21208f5f6178SGerhard Heift if (*num_found) { 2121ac8e9819SChris Mason ret = 1; 21228f5f6178SGerhard Heift goto out; 21238f5f6178SGerhard Heift } 21248f5f6178SGerhard Heift 21258f5f6178SGerhard Heift /* 21268f5f6178SGerhard Heift * return one empty item back for v1, which does not 21278f5f6178SGerhard Heift * handle -EOVERFLOW 21288f5f6178SGerhard Heift */ 21298f5f6178SGerhard Heift 21309b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2131ac8e9819SChris Mason item_len = 0; 21328f5f6178SGerhard Heift ret = -EOVERFLOW; 21338f5f6178SGerhard Heift } 2134ac8e9819SChris Mason 21359b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2136ac8e9819SChris Mason ret = 1; 213725c9bc2eSGerhard Heift goto out; 2138ac8e9819SChris Mason } 2139ac8e9819SChris Mason 2140ac8e9819SChris Mason sh.objectid = key->objectid; 2141ac8e9819SChris Mason sh.offset = key->offset; 2142ac8e9819SChris Mason sh.type = key->type; 2143ac8e9819SChris Mason sh.len = item_len; 2144ac8e9819SChris Mason sh.transid = found_transid; 2145ac8e9819SChris Mason 2146a48b73ecSJosef Bacik /* 2147a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2148a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2149a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2150a48b73ecSJosef Bacik * properly this next time through 2151a48b73ecSJosef Bacik */ 2152a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2153a48b73ecSJosef Bacik ret = 0; 2154ba346b35SGerhard Heift goto out; 2155ba346b35SGerhard Heift } 2156ba346b35SGerhard Heift 2157ac8e9819SChris Mason *sk_offset += sizeof(sh); 2158ac8e9819SChris Mason 2159ac8e9819SChris Mason if (item_len) { 2160ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2161a48b73ecSJosef Bacik /* 2162a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2163a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2164a48b73ecSJosef Bacik */ 2165a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2166ba346b35SGerhard Heift item_off, item_len)) { 2167a48b73ecSJosef Bacik ret = 0; 2168a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2169ba346b35SGerhard Heift goto out; 2170ba346b35SGerhard Heift } 2171ba346b35SGerhard Heift 2172ac8e9819SChris Mason *sk_offset += item_len; 2173ac8e9819SChris Mason } 2174e2156867SHugo Mills (*num_found)++; 2175ac8e9819SChris Mason 21768f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21778f5f6178SGerhard Heift goto out; 21788f5f6178SGerhard Heift 217925c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 218025c9bc2eSGerhard Heift ret = 1; 218125c9bc2eSGerhard Heift goto out; 218225c9bc2eSGerhard Heift } 2183ac8e9819SChris Mason } 2184ac8e9819SChris Mason advance_key: 2185ac8e9819SChris Mason ret = 0; 2186dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2187dd81d459SNaohiro Aota test.type = sk->max_type; 2188dd81d459SNaohiro Aota test.offset = sk->max_offset; 2189dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2190dd81d459SNaohiro Aota ret = 1; 2191dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2192abc6e134SChris Mason key->offset++; 2193dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2194abc6e134SChris Mason key->offset = 0; 2195abc6e134SChris Mason key->type++; 2196dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2197abc6e134SChris Mason key->offset = 0; 2198abc6e134SChris Mason key->type = 0; 2199abc6e134SChris Mason key->objectid++; 2200abc6e134SChris Mason } else 2201abc6e134SChris Mason ret = 1; 220225c9bc2eSGerhard Heift out: 2203ba346b35SGerhard Heift /* 2204ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2205ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2206ba346b35SGerhard Heift * * all items were found 2207ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2208ba346b35SGerhard Heift * leaf 2209ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2210ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2211ba346b35SGerhard Heift */ 2212ac8e9819SChris Mason return ret; 2213ac8e9819SChris Mason } 2214ac8e9819SChris Mason 2215ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 221612544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22179b6e817dSGerhard Heift size_t *buf_size, 2218ba346b35SGerhard Heift char __user *ubuf) 2219ac8e9819SChris Mason { 22200b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2221ac8e9819SChris Mason struct btrfs_root *root; 2222ac8e9819SChris Mason struct btrfs_key key; 2223ac8e9819SChris Mason struct btrfs_path *path; 2224ac8e9819SChris Mason int ret; 2225ac8e9819SChris Mason int num_found = 0; 2226ac8e9819SChris Mason unsigned long sk_offset = 0; 2227ac8e9819SChris Mason 22289b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22299b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 223012544442SGerhard Heift return -EOVERFLOW; 22319b6e817dSGerhard Heift } 223212544442SGerhard Heift 2233ac8e9819SChris Mason path = btrfs_alloc_path(); 2234ac8e9819SChris Mason if (!path) 2235ac8e9819SChris Mason return -ENOMEM; 2236ac8e9819SChris Mason 2237ac8e9819SChris Mason if (sk->tree_id == 0) { 2238ac8e9819SChris Mason /* search the root of the inode that was passed */ 223900246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2240ac8e9819SChris Mason } else { 224156e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2242ac8e9819SChris Mason if (IS_ERR(root)) { 2243ac8e9819SChris Mason btrfs_free_path(path); 2244ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2245ac8e9819SChris Mason } 2246ac8e9819SChris Mason } 2247ac8e9819SChris Mason 2248ac8e9819SChris Mason key.objectid = sk->min_objectid; 2249ac8e9819SChris Mason key.type = sk->min_type; 2250ac8e9819SChris Mason key.offset = sk->min_offset; 2251ac8e9819SChris Mason 2252ac8e9819SChris Mason while (1) { 22531c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22541c78544eSFilipe Manana *buf_size - sk_offset); 2255a48b73ecSJosef Bacik if (ret) 2256a48b73ecSJosef Bacik break; 2257a48b73ecSJosef Bacik 22586174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2259ac8e9819SChris Mason if (ret != 0) { 2260ac8e9819SChris Mason if (ret > 0) 2261ac8e9819SChris Mason ret = 0; 2262ac8e9819SChris Mason goto err; 2263ac8e9819SChris Mason } 2264df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2265ac8e9819SChris Mason &sk_offset, &num_found); 2266b3b4aa74SDavid Sterba btrfs_release_path(path); 226725c9bc2eSGerhard Heift if (ret) 2268ac8e9819SChris Mason break; 2269ac8e9819SChris Mason 2270ac8e9819SChris Mason } 22718f5f6178SGerhard Heift if (ret > 0) 2272ac8e9819SChris Mason ret = 0; 2273ac8e9819SChris Mason err: 2274ac8e9819SChris Mason sk->nr_items = num_found; 227500246528SJosef Bacik btrfs_put_root(root); 2276ac8e9819SChris Mason btrfs_free_path(path); 2277ac8e9819SChris Mason return ret; 2278ac8e9819SChris Mason } 2279ac8e9819SChris Mason 2280ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2281ac8e9819SChris Mason void __user *argp) 2282ac8e9819SChris Mason { 2283ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2284ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2285ac8e9819SChris Mason struct inode *inode; 2286ac8e9819SChris Mason int ret; 22879b6e817dSGerhard Heift size_t buf_size; 2288ac8e9819SChris Mason 2289ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2290ac8e9819SChris Mason return -EPERM; 2291ac8e9819SChris Mason 2292ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2293ac8e9819SChris Mason 2294ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2295ba346b35SGerhard Heift return -EFAULT; 2296ba346b35SGerhard Heift 2297ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2298ac8e9819SChris Mason 2299496ad9aaSAl Viro inode = file_inode(file); 2300ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23018f5f6178SGerhard Heift 23028f5f6178SGerhard Heift /* 23038f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23048f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23058f5f6178SGerhard Heift */ 23068f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23078f5f6178SGerhard Heift ret = 0; 23088f5f6178SGerhard Heift 2309ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2310ac8e9819SChris Mason ret = -EFAULT; 2311ac8e9819SChris Mason return ret; 2312ac8e9819SChris Mason } 2313ac8e9819SChris Mason 2314cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2315cc68a8a5SGerhard Heift void __user *argp) 2316cc68a8a5SGerhard Heift { 2317cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2318cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2319cc68a8a5SGerhard Heift struct inode *inode; 2320cc68a8a5SGerhard Heift int ret; 2321cc68a8a5SGerhard Heift size_t buf_size; 2322ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2323cc68a8a5SGerhard Heift 2324cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2325cc68a8a5SGerhard Heift return -EPERM; 2326cc68a8a5SGerhard Heift 2327cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2328cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2329cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2330cc68a8a5SGerhard Heift return -EFAULT; 2331cc68a8a5SGerhard Heift 2332cc68a8a5SGerhard Heift buf_size = args.buf_size; 2333cc68a8a5SGerhard Heift 2334cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2335cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2336cc68a8a5SGerhard Heift buf_size = buf_limit; 2337cc68a8a5SGerhard Heift 2338cc68a8a5SGerhard Heift inode = file_inode(file); 2339cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2340718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2341cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2342cc68a8a5SGerhard Heift ret = -EFAULT; 2343cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2344cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2345cc68a8a5SGerhard Heift ret = -EFAULT; 2346cc68a8a5SGerhard Heift 234776dda93cSYan, Zheng return ret; 234876dda93cSYan, Zheng } 234976dda93cSYan, Zheng 235098d377a0STARUISI Hiroaki /* 2351ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2352ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 235398d377a0STARUISI Hiroaki */ 235498d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 235598d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 235698d377a0STARUISI Hiroaki { 235798d377a0STARUISI Hiroaki struct btrfs_root *root; 235898d377a0STARUISI Hiroaki struct btrfs_key key; 2359ac8e9819SChris Mason char *ptr; 236098d377a0STARUISI Hiroaki int ret = -1; 236198d377a0STARUISI Hiroaki int slot; 236298d377a0STARUISI Hiroaki int len; 236398d377a0STARUISI Hiroaki int total_len = 0; 236498d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 236598d377a0STARUISI Hiroaki struct extent_buffer *l; 236698d377a0STARUISI Hiroaki struct btrfs_path *path; 236798d377a0STARUISI Hiroaki 236898d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 236998d377a0STARUISI Hiroaki name[0]='\0'; 237098d377a0STARUISI Hiroaki return 0; 237198d377a0STARUISI Hiroaki } 237298d377a0STARUISI Hiroaki 237398d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 237498d377a0STARUISI Hiroaki if (!path) 237598d377a0STARUISI Hiroaki return -ENOMEM; 237698d377a0STARUISI Hiroaki 2377c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 237898d377a0STARUISI Hiroaki 237956e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 238098d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2381ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 238288234012SJosef Bacik root = NULL; 238388234012SJosef Bacik goto out; 238488234012SJosef Bacik } 238598d377a0STARUISI Hiroaki 238698d377a0STARUISI Hiroaki key.objectid = dirid; 238798d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23888ad6fcabSChris Mason key.offset = (u64)-1; 238998d377a0STARUISI Hiroaki 239098d377a0STARUISI Hiroaki while (1) { 239198d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 239298d377a0STARUISI Hiroaki if (ret < 0) 239398d377a0STARUISI Hiroaki goto out; 239418674c6cSFilipe David Borba Manana else if (ret > 0) { 239518674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 239618674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 239718674c6cSFilipe David Borba Manana if (ret < 0) 239818674c6cSFilipe David Borba Manana goto out; 239918674c6cSFilipe David Borba Manana else if (ret > 0) { 2400ac8e9819SChris Mason ret = -ENOENT; 240198d377a0STARUISI Hiroaki goto out; 2402ac8e9819SChris Mason } 240318674c6cSFilipe David Borba Manana } 240418674c6cSFilipe David Borba Manana 240518674c6cSFilipe David Borba Manana l = path->nodes[0]; 240618674c6cSFilipe David Borba Manana slot = path->slots[0]; 240718674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 240898d377a0STARUISI Hiroaki 240998d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 241098d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 241198d377a0STARUISI Hiroaki ptr -= len + 1; 241298d377a0STARUISI Hiroaki total_len += len + 1; 2413a696cf35SFilipe David Borba Manana if (ptr < name) { 2414a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 241598d377a0STARUISI Hiroaki goto out; 2416a696cf35SFilipe David Borba Manana } 241798d377a0STARUISI Hiroaki 241898d377a0STARUISI Hiroaki *(ptr + len) = '/'; 241998d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 242098d377a0STARUISI Hiroaki 242198d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 242298d377a0STARUISI Hiroaki break; 242398d377a0STARUISI Hiroaki 2424b3b4aa74SDavid Sterba btrfs_release_path(path); 242598d377a0STARUISI Hiroaki key.objectid = key.offset; 24268ad6fcabSChris Mason key.offset = (u64)-1; 242798d377a0STARUISI Hiroaki dirid = key.objectid; 242898d377a0STARUISI Hiroaki } 242977906a50SLi Zefan memmove(name, ptr, total_len); 243098d377a0STARUISI Hiroaki name[total_len] = '\0'; 243198d377a0STARUISI Hiroaki ret = 0; 243298d377a0STARUISI Hiroaki out: 243300246528SJosef Bacik btrfs_put_root(root); 243498d377a0STARUISI Hiroaki btrfs_free_path(path); 2435ac8e9819SChris Mason return ret; 2436ac8e9819SChris Mason } 2437ac8e9819SChris Mason 243823d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 243923d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 244023d0b79dSTomohiro Misono { 244123d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 244223d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 244323d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 244423d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 244523d0b79dSTomohiro Misono u64 dirid = args->dirid; 244623d0b79dSTomohiro Misono unsigned long item_off; 244723d0b79dSTomohiro Misono unsigned long item_len; 244823d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 244923d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2450b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 245123d0b79dSTomohiro Misono struct btrfs_path *path; 245223d0b79dSTomohiro Misono struct btrfs_key key, key2; 245323d0b79dSTomohiro Misono struct extent_buffer *leaf; 245423d0b79dSTomohiro Misono struct inode *temp_inode; 245523d0b79dSTomohiro Misono char *ptr; 245623d0b79dSTomohiro Misono int slot; 245723d0b79dSTomohiro Misono int len; 245823d0b79dSTomohiro Misono int total_len = 0; 245923d0b79dSTomohiro Misono int ret; 246023d0b79dSTomohiro Misono 246123d0b79dSTomohiro Misono path = btrfs_alloc_path(); 246223d0b79dSTomohiro Misono if (!path) 246323d0b79dSTomohiro Misono return -ENOMEM; 246423d0b79dSTomohiro Misono 246523d0b79dSTomohiro Misono /* 246623d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 246723d0b79dSTomohiro Misono * construct the path in from the bottom up. 246823d0b79dSTomohiro Misono */ 246923d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 247023d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 247123d0b79dSTomohiro Misono 247256e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 247323d0b79dSTomohiro Misono if (IS_ERR(root)) { 247423d0b79dSTomohiro Misono ret = PTR_ERR(root); 247523d0b79dSTomohiro Misono goto out; 247623d0b79dSTomohiro Misono } 247723d0b79dSTomohiro Misono 247823d0b79dSTomohiro Misono key.objectid = dirid; 247923d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 248023d0b79dSTomohiro Misono key.offset = (u64)-1; 248123d0b79dSTomohiro Misono while (1) { 248223d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 248323d0b79dSTomohiro Misono if (ret < 0) { 2484b8a49ae1SJosef Bacik goto out_put; 248523d0b79dSTomohiro Misono } else if (ret > 0) { 248623d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 248723d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 248823d0b79dSTomohiro Misono if (ret < 0) { 2489b8a49ae1SJosef Bacik goto out_put; 249023d0b79dSTomohiro Misono } else if (ret > 0) { 249123d0b79dSTomohiro Misono ret = -ENOENT; 2492b8a49ae1SJosef Bacik goto out_put; 249323d0b79dSTomohiro Misono } 249423d0b79dSTomohiro Misono } 249523d0b79dSTomohiro Misono 249623d0b79dSTomohiro Misono leaf = path->nodes[0]; 249723d0b79dSTomohiro Misono slot = path->slots[0]; 249823d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 249923d0b79dSTomohiro Misono 250023d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 250123d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 250223d0b79dSTomohiro Misono ptr -= len + 1; 250323d0b79dSTomohiro Misono total_len += len + 1; 250423d0b79dSTomohiro Misono if (ptr < args->path) { 250523d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2506b8a49ae1SJosef Bacik goto out_put; 250723d0b79dSTomohiro Misono } 250823d0b79dSTomohiro Misono 250923d0b79dSTomohiro Misono *(ptr + len) = '/'; 251023d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 251123d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 251223d0b79dSTomohiro Misono 251323d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 251423d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 251523d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 251623d0b79dSTomohiro Misono if (ret < 0) { 2517b8a49ae1SJosef Bacik goto out_put; 251823d0b79dSTomohiro Misono } else if (ret > 0) { 251923d0b79dSTomohiro Misono ret = -ENOENT; 2520b8a49ae1SJosef Bacik goto out_put; 252123d0b79dSTomohiro Misono } 252223d0b79dSTomohiro Misono 252323d0b79dSTomohiro Misono leaf = path->nodes[0]; 252423d0b79dSTomohiro Misono slot = path->slots[0]; 252523d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 252623d0b79dSTomohiro Misono if (key2.objectid != dirid) { 252723d0b79dSTomohiro Misono ret = -ENOENT; 2528b8a49ae1SJosef Bacik goto out_put; 252923d0b79dSTomohiro Misono } 253023d0b79dSTomohiro Misono 25310202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25323ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25333ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2534b8a49ae1SJosef Bacik goto out_put; 25353ca57bd6SMisono Tomohiro } 253623d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 253723d0b79dSTomohiro Misono iput(temp_inode); 253823d0b79dSTomohiro Misono if (ret) { 253923d0b79dSTomohiro Misono ret = -EACCES; 2540b8a49ae1SJosef Bacik goto out_put; 254123d0b79dSTomohiro Misono } 254223d0b79dSTomohiro Misono 254323d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 254423d0b79dSTomohiro Misono break; 254523d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 254623d0b79dSTomohiro Misono ret = -EACCES; 2547b8a49ae1SJosef Bacik goto out_put; 254823d0b79dSTomohiro Misono } 254923d0b79dSTomohiro Misono 255023d0b79dSTomohiro Misono btrfs_release_path(path); 255123d0b79dSTomohiro Misono key.objectid = key.offset; 255223d0b79dSTomohiro Misono key.offset = (u64)-1; 255323d0b79dSTomohiro Misono dirid = key.objectid; 255423d0b79dSTomohiro Misono } 255523d0b79dSTomohiro Misono 255623d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 255723d0b79dSTomohiro Misono args->path[total_len] = '\0'; 255800246528SJosef Bacik btrfs_put_root(root); 2559b8a49ae1SJosef Bacik root = NULL; 256023d0b79dSTomohiro Misono btrfs_release_path(path); 256123d0b79dSTomohiro Misono } 256223d0b79dSTomohiro Misono 256323d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 256423d0b79dSTomohiro Misono key.objectid = treeid; 256523d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 256623d0b79dSTomohiro Misono key.offset = args->treeid; 2567b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 256823d0b79dSTomohiro Misono if (ret < 0) { 256923d0b79dSTomohiro Misono goto out; 257023d0b79dSTomohiro Misono } else if (ret > 0) { 257123d0b79dSTomohiro Misono ret = -ENOENT; 257223d0b79dSTomohiro Misono goto out; 257323d0b79dSTomohiro Misono } 257423d0b79dSTomohiro Misono 257523d0b79dSTomohiro Misono leaf = path->nodes[0]; 257623d0b79dSTomohiro Misono slot = path->slots[0]; 257723d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 257823d0b79dSTomohiro Misono 257923d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 258023d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 258123d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 258223d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 258323d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 258423d0b79dSTomohiro Misono ret = -EINVAL; 258523d0b79dSTomohiro Misono goto out; 258623d0b79dSTomohiro Misono } 258723d0b79dSTomohiro Misono 258823d0b79dSTomohiro Misono /* Copy subvolume's name */ 258923d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 259023d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 259123d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 259223d0b79dSTomohiro Misono args->name[item_len] = 0; 259323d0b79dSTomohiro Misono 2594b8a49ae1SJosef Bacik out_put: 259500246528SJosef Bacik btrfs_put_root(root); 259623d0b79dSTomohiro Misono out: 259723d0b79dSTomohiro Misono btrfs_free_path(path); 259823d0b79dSTomohiro Misono return ret; 259923d0b79dSTomohiro Misono } 260023d0b79dSTomohiro Misono 2601ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2602ac8e9819SChris Mason void __user *argp) 2603ac8e9819SChris Mason { 2604ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2605ac8e9819SChris Mason struct inode *inode; 260601b810b8SDavid Sterba int ret = 0; 2607ac8e9819SChris Mason 26082354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26092354d08fSJulia Lawall if (IS_ERR(args)) 26102354d08fSJulia Lawall return PTR_ERR(args); 2611c2b96929SDan Carpenter 2612496ad9aaSAl Viro inode = file_inode(file); 2613ac8e9819SChris Mason 261401b810b8SDavid Sterba /* 261501b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 261601b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 261701b810b8SDavid Sterba */ 26181b53ac4dSChris Mason if (args->treeid == 0) 26191b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26201b53ac4dSChris Mason 262101b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 262201b810b8SDavid Sterba args->name[0] = 0; 262301b810b8SDavid Sterba goto out; 262401b810b8SDavid Sterba } 262501b810b8SDavid Sterba 262601b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 262701b810b8SDavid Sterba ret = -EPERM; 262801b810b8SDavid Sterba goto out; 262901b810b8SDavid Sterba } 263001b810b8SDavid Sterba 2631ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2632ac8e9819SChris Mason args->treeid, args->objectid, 2633ac8e9819SChris Mason args->name); 2634ac8e9819SChris Mason 263501b810b8SDavid Sterba out: 2636ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2637ac8e9819SChris Mason ret = -EFAULT; 2638ac8e9819SChris Mason 2639ac8e9819SChris Mason kfree(args); 264098d377a0STARUISI Hiroaki return ret; 264198d377a0STARUISI Hiroaki } 264298d377a0STARUISI Hiroaki 264323d0b79dSTomohiro Misono /* 264423d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 264523d0b79dSTomohiro Misono * 264623d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 264723d0b79dSTomohiro Misono * 264823d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 264923d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 265023d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 265123d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 265223d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 265323d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 265423d0b79dSTomohiro Misono */ 265523d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 265623d0b79dSTomohiro Misono { 265723d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 265823d0b79dSTomohiro Misono struct inode *inode; 265923d0b79dSTomohiro Misono int ret; 266023d0b79dSTomohiro Misono 266123d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 266223d0b79dSTomohiro Misono if (IS_ERR(args)) 266323d0b79dSTomohiro Misono return PTR_ERR(args); 266423d0b79dSTomohiro Misono 266523d0b79dSTomohiro Misono inode = file_inode(file); 266623d0b79dSTomohiro Misono 266723d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 266823d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 266923d0b79dSTomohiro Misono /* 267023d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 267123d0b79dSTomohiro Misono * called 267223d0b79dSTomohiro Misono */ 267323d0b79dSTomohiro Misono kfree(args); 267423d0b79dSTomohiro Misono return -EACCES; 267523d0b79dSTomohiro Misono } 267623d0b79dSTomohiro Misono 267723d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 267823d0b79dSTomohiro Misono 267923d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 268023d0b79dSTomohiro Misono ret = -EFAULT; 268123d0b79dSTomohiro Misono 268223d0b79dSTomohiro Misono kfree(args); 268323d0b79dSTomohiro Misono return ret; 268423d0b79dSTomohiro Misono } 268523d0b79dSTomohiro Misono 2686b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2687b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2688b64ec075STomohiro Misono { 2689b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2690b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2691b64ec075STomohiro Misono struct btrfs_root *root; 2692b64ec075STomohiro Misono struct btrfs_path *path; 2693b64ec075STomohiro Misono struct btrfs_key key; 2694b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2695b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2696b64ec075STomohiro Misono struct extent_buffer *leaf; 2697b64ec075STomohiro Misono unsigned long item_off; 2698b64ec075STomohiro Misono unsigned long item_len; 2699b64ec075STomohiro Misono struct inode *inode; 2700b64ec075STomohiro Misono int slot; 2701b64ec075STomohiro Misono int ret = 0; 2702b64ec075STomohiro Misono 2703b64ec075STomohiro Misono path = btrfs_alloc_path(); 2704b64ec075STomohiro Misono if (!path) 2705b64ec075STomohiro Misono return -ENOMEM; 2706b64ec075STomohiro Misono 2707b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2708b64ec075STomohiro Misono if (!subvol_info) { 2709b64ec075STomohiro Misono btrfs_free_path(path); 2710b64ec075STomohiro Misono return -ENOMEM; 2711b64ec075STomohiro Misono } 2712b64ec075STomohiro Misono 2713b64ec075STomohiro Misono inode = file_inode(file); 2714b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2715b64ec075STomohiro Misono 2716b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2717b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 271856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2719b64ec075STomohiro Misono if (IS_ERR(root)) { 2720b64ec075STomohiro Misono ret = PTR_ERR(root); 272104734e84SJosef Bacik goto out_free; 272204734e84SJosef Bacik } 2723b64ec075STomohiro Misono root_item = &root->root_item; 2724b64ec075STomohiro Misono 2725b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2726b64ec075STomohiro Misono 2727b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2728b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2729b64ec075STomohiro Misono 2730b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2731b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2732b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2733b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2734b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2735b64ec075STomohiro Misono 2736b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2737b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2738b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2739b64ec075STomohiro Misono 2740b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2741b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2742b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2743b64ec075STomohiro Misono 2744b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2745b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2746b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2747b64ec075STomohiro Misono 2748b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2749b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2750b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2751b64ec075STomohiro Misono 2752b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2753b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2754b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2755b64ec075STomohiro Misono key.offset = 0; 275604734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2757b64ec075STomohiro Misono if (ret < 0) { 2758b64ec075STomohiro Misono goto out; 2759b64ec075STomohiro Misono } else if (path->slots[0] >= 2760b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 276104734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2762b64ec075STomohiro Misono if (ret < 0) { 2763b64ec075STomohiro Misono goto out; 2764b64ec075STomohiro Misono } else if (ret > 0) { 2765b64ec075STomohiro Misono ret = -EUCLEAN; 2766b64ec075STomohiro Misono goto out; 2767b64ec075STomohiro Misono } 2768b64ec075STomohiro Misono } 2769b64ec075STomohiro Misono 2770b64ec075STomohiro Misono leaf = path->nodes[0]; 2771b64ec075STomohiro Misono slot = path->slots[0]; 2772b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2773b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2774b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2775b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2776b64ec075STomohiro Misono 2777b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2778b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2779b64ec075STomohiro Misono 2780b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2781b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2782b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2783b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2784b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2785b64ec075STomohiro Misono item_off, item_len); 2786b64ec075STomohiro Misono } else { 2787b64ec075STomohiro Misono ret = -ENOENT; 2788b64ec075STomohiro Misono goto out; 2789b64ec075STomohiro Misono } 2790b64ec075STomohiro Misono } 2791b64ec075STomohiro Misono 2792b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2793b64ec075STomohiro Misono ret = -EFAULT; 2794b64ec075STomohiro Misono 2795b64ec075STomohiro Misono out: 279600246528SJosef Bacik btrfs_put_root(root); 279704734e84SJosef Bacik out_free: 2798b64ec075STomohiro Misono btrfs_free_path(path); 2799b091f7feSWaiman Long kfree(subvol_info); 2800b64ec075STomohiro Misono return ret; 2801b64ec075STomohiro Misono } 2802b64ec075STomohiro Misono 280342e4b520STomohiro Misono /* 280442e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 280542e4b520STomohiro Misono * except the subvolume name. 280642e4b520STomohiro Misono */ 280742e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 280842e4b520STomohiro Misono { 280942e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 281042e4b520STomohiro Misono struct btrfs_root_ref *rref; 281142e4b520STomohiro Misono struct btrfs_root *root; 281242e4b520STomohiro Misono struct btrfs_path *path; 281342e4b520STomohiro Misono struct btrfs_key key; 281442e4b520STomohiro Misono struct extent_buffer *leaf; 281542e4b520STomohiro Misono struct inode *inode; 281642e4b520STomohiro Misono u64 objectid; 281742e4b520STomohiro Misono int slot; 281842e4b520STomohiro Misono int ret; 281942e4b520STomohiro Misono u8 found; 282042e4b520STomohiro Misono 282142e4b520STomohiro Misono path = btrfs_alloc_path(); 282242e4b520STomohiro Misono if (!path) 282342e4b520STomohiro Misono return -ENOMEM; 282442e4b520STomohiro Misono 282542e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 282642e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 282742e4b520STomohiro Misono btrfs_free_path(path); 282842e4b520STomohiro Misono return PTR_ERR(rootrefs); 282942e4b520STomohiro Misono } 283042e4b520STomohiro Misono 283142e4b520STomohiro Misono inode = file_inode(file); 283242e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 283342e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 283442e4b520STomohiro Misono 283542e4b520STomohiro Misono key.objectid = objectid; 283642e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 283742e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 283842e4b520STomohiro Misono found = 0; 283942e4b520STomohiro Misono 284042e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 284142e4b520STomohiro Misono if (ret < 0) { 284242e4b520STomohiro Misono goto out; 284342e4b520STomohiro Misono } else if (path->slots[0] >= 284442e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 284542e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 284642e4b520STomohiro Misono if (ret < 0) { 284742e4b520STomohiro Misono goto out; 284842e4b520STomohiro Misono } else if (ret > 0) { 284942e4b520STomohiro Misono ret = -EUCLEAN; 285042e4b520STomohiro Misono goto out; 285142e4b520STomohiro Misono } 285242e4b520STomohiro Misono } 285342e4b520STomohiro Misono while (1) { 285442e4b520STomohiro Misono leaf = path->nodes[0]; 285542e4b520STomohiro Misono slot = path->slots[0]; 285642e4b520STomohiro Misono 285742e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 285842e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 285942e4b520STomohiro Misono ret = 0; 286042e4b520STomohiro Misono goto out; 286142e4b520STomohiro Misono } 286242e4b520STomohiro Misono 286342e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 286442e4b520STomohiro Misono ret = -EOVERFLOW; 286542e4b520STomohiro Misono goto out; 286642e4b520STomohiro Misono } 286742e4b520STomohiro Misono 286842e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 286942e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 287042e4b520STomohiro Misono rootrefs->rootref[found].dirid = 287142e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 287242e4b520STomohiro Misono found++; 287342e4b520STomohiro Misono 287442e4b520STomohiro Misono ret = btrfs_next_item(root, path); 287542e4b520STomohiro Misono if (ret < 0) { 287642e4b520STomohiro Misono goto out; 287742e4b520STomohiro Misono } else if (ret > 0) { 287842e4b520STomohiro Misono ret = -EUCLEAN; 287942e4b520STomohiro Misono goto out; 288042e4b520STomohiro Misono } 288142e4b520STomohiro Misono } 288242e4b520STomohiro Misono 288342e4b520STomohiro Misono out: 288442e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 288542e4b520STomohiro Misono rootrefs->num_items = found; 288642e4b520STomohiro Misono /* update min_treeid for next search */ 288742e4b520STomohiro Misono if (found) 288842e4b520STomohiro Misono rootrefs->min_treeid = 288942e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 289042e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 289142e4b520STomohiro Misono ret = -EFAULT; 289242e4b520STomohiro Misono } 289342e4b520STomohiro Misono 289442e4b520STomohiro Misono kfree(rootrefs); 289542e4b520STomohiro Misono btrfs_free_path(path); 289642e4b520STomohiro Misono 289742e4b520STomohiro Misono return ret; 289842e4b520STomohiro Misono } 289942e4b520STomohiro Misono 290076dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2901949964c9SMarcos Paulo de Souza void __user *arg, 2902949964c9SMarcos Paulo de Souza bool destroy_v2) 290376dda93cSYan, Zheng { 290454563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29050b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 290676dda93cSYan, Zheng struct dentry *dentry; 29072b0143b5SDavid Howells struct inode *dir = d_inode(parent); 290876dda93cSYan, Zheng struct inode *inode; 290976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 291076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2911949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2912949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2913949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2914949964c9SMarcos Paulo de Souza int subvol_namelen; 291576dda93cSYan, Zheng int err = 0; 2916949964c9SMarcos Paulo de Souza bool destroy_parent = false; 291776dda93cSYan, Zheng 2918949964c9SMarcos Paulo de Souza if (destroy_v2) { 2919949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2920949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2921949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2922325c50e3SJeff Mahoney 2923949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2924949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2925949964c9SMarcos Paulo de Souza goto out; 2926949964c9SMarcos Paulo de Souza } 292776dda93cSYan, Zheng 2928949964c9SMarcos Paulo de Souza /* 2929949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2930949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2931949964c9SMarcos Paulo de Souza */ 2932949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2933949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2934949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2935949964c9SMarcos Paulo de Souza 2936949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2937949964c9SMarcos Paulo de Souza if (err) 2938949964c9SMarcos Paulo de Souza goto out; 2939949964c9SMarcos Paulo de Souza } else { 2940949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 294176dda93cSYan, Zheng err = -EINVAL; 294276dda93cSYan, Zheng goto out; 294376dda93cSYan, Zheng } 294476dda93cSYan, Zheng 2945a561be71SAl Viro err = mnt_want_write_file(file); 294676dda93cSYan, Zheng if (err) 294776dda93cSYan, Zheng goto out; 294876dda93cSYan, Zheng 2949949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2950949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2951949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2952949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2953949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2954949964c9SMarcos Paulo de Souza goto out_drop_write; 2955949964c9SMarcos Paulo de Souza } 2956949964c9SMarcos Paulo de Souza 2957949964c9SMarcos Paulo de Souza /* 2958949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2959949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2960949964c9SMarcos Paulo de Souza */ 2961949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2962949964c9SMarcos Paulo de Souza 2963949964c9SMarcos Paulo de Souza /* 2964949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2965949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2966949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2967949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2968949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2969949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2970949964c9SMarcos Paulo de Souza */ 2971949964c9SMarcos Paulo de Souza dput(dentry); 2972949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2973949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2974949964c9SMarcos Paulo de Souza goto out_drop_write; 2975949964c9SMarcos Paulo de Souza } 2976949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2977949964c9SMarcos Paulo de Souza 2978949964c9SMarcos Paulo de Souza /* 2979949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2980949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2981949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2982949964c9SMarcos Paulo de Souza * new parent dentry. 2983949964c9SMarcos Paulo de Souza */ 2984949964c9SMarcos Paulo de Souza destroy_parent = true; 2985949964c9SMarcos Paulo de Souza 2986949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2987949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2988949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2989949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2990949964c9SMarcos Paulo de Souza goto free_parent; 2991949964c9SMarcos Paulo de Souza } 2992949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2993949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 2994949964c9SMarcos Paulo de Souza } 2995949964c9SMarcos Paulo de Souza } else { 2996949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 2997949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 2998949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 2999949964c9SMarcos Paulo de Souza 3000949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3001949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3002949964c9SMarcos Paulo de Souza 3003949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3004949964c9SMarcos Paulo de Souza if (err) 3005949964c9SMarcos Paulo de Souza goto out; 3006949964c9SMarcos Paulo de Souza } 3007949964c9SMarcos Paulo de Souza 3008949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3009949964c9SMarcos Paulo de Souza 3010949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3011949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3012949964c9SMarcos Paulo de Souza err = -EINVAL; 3013949964c9SMarcos Paulo de Souza goto free_subvol_name; 3014949964c9SMarcos Paulo de Souza } 3015949964c9SMarcos Paulo de Souza 3016949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3017949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3018949964c9SMarcos Paulo de Souza goto free_subvol_name; 3019949964c9SMarcos Paulo de Souza } 3020521e0546SDavid Sterba 302100235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 302200235411SAl Viro if (err == -EINTR) 3023949964c9SMarcos Paulo de Souza goto free_subvol_name; 3024949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 302576dda93cSYan, Zheng if (IS_ERR(dentry)) { 302676dda93cSYan, Zheng err = PTR_ERR(dentry); 302776dda93cSYan, Zheng goto out_unlock_dir; 302876dda93cSYan, Zheng } 302976dda93cSYan, Zheng 30302b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 303176dda93cSYan, Zheng err = -ENOENT; 303276dda93cSYan, Zheng goto out_dput; 303376dda93cSYan, Zheng } 303476dda93cSYan, Zheng 30352b0143b5SDavid Howells inode = d_inode(dentry); 30364260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30374260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30384260f7c7SSage Weil /* 30394260f7c7SSage Weil * Regular user. Only allow this with a special mount 30404260f7c7SSage Weil * option, when the user has write+exec access to the 30414260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30424260f7c7SSage Weil * allowed. 30434260f7c7SSage Weil * 30444260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30454260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30464260f7c7SSage Weil * otherwise be able to delete. 30474260f7c7SSage Weil * 30484260f7c7SSage Weil * Users who want to delete empty subvols should try 30494260f7c7SSage Weil * rmdir(2). 30504260f7c7SSage Weil */ 30514260f7c7SSage Weil err = -EPERM; 30520b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30534260f7c7SSage Weil goto out_dput; 30544260f7c7SSage Weil 30554260f7c7SSage Weil /* 30564260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30574260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30584260f7c7SSage Weil * must be called on the dentry referencing the root 30594260f7c7SSage Weil * of the subvol, not a random directory contained 30604260f7c7SSage Weil * within it. 30614260f7c7SSage Weil */ 30624260f7c7SSage Weil err = -EINVAL; 30634260f7c7SSage Weil if (root == dest) 30644260f7c7SSage Weil goto out_dput; 30654260f7c7SSage Weil 30664260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30674260f7c7SSage Weil if (err) 30684260f7c7SSage Weil goto out_dput; 30695c39da5bSMiao Xie } 30704260f7c7SSage Weil 30715c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30724260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30734260f7c7SSage Weil if (err) 30744260f7c7SSage Weil goto out_dput; 30754260f7c7SSage Weil 30764a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 307776dda93cSYan, Zheng err = -EINVAL; 307876dda93cSYan, Zheng goto out_dput; 307976dda93cSYan, Zheng } 308076dda93cSYan, Zheng 30815955102cSAl Viro inode_lock(inode); 3082f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 30835955102cSAl Viro inode_unlock(inode); 308446008d9dSAmir Goldstein if (!err) { 308546008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 308676dda93cSYan, Zheng d_delete(dentry); 308746008d9dSAmir Goldstein } 3088fa6ac876SLiu Bo 308976dda93cSYan, Zheng out_dput: 309076dda93cSYan, Zheng dput(dentry); 309176dda93cSYan, Zheng out_unlock_dir: 30925955102cSAl Viro inode_unlock(dir); 3093949964c9SMarcos Paulo de Souza free_subvol_name: 3094949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3095949964c9SMarcos Paulo de Souza free_parent: 3096949964c9SMarcos Paulo de Souza if (destroy_parent) 3097949964c9SMarcos Paulo de Souza dput(parent); 309800235411SAl Viro out_drop_write: 30992a79f17eSAl Viro mnt_drop_write_file(file); 310076dda93cSYan, Zheng out: 3101949964c9SMarcos Paulo de Souza kfree(vol_args2); 310276dda93cSYan, Zheng kfree(vol_args); 310376dda93cSYan, Zheng return err; 310476dda93cSYan, Zheng } 310576dda93cSYan, Zheng 31061e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3107f46b5a66SChristoph Hellwig { 3108496ad9aaSAl Viro struct inode *inode = file_inode(file); 3109f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31101e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3111c146afadSYan Zheng int ret; 3112c146afadSYan Zheng 311325122d15SIlya Dryomov ret = mnt_want_write_file(file); 311425122d15SIlya Dryomov if (ret) 311525122d15SIlya Dryomov return ret; 3116b83cc969SLi Zefan 311725122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 311825122d15SIlya Dryomov ret = -EROFS; 311925122d15SIlya Dryomov goto out; 31205ac00addSStefan Behrens } 3121f46b5a66SChristoph Hellwig 3122f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3123f46b5a66SChristoph Hellwig case S_IFDIR: 3124e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3125e441d54dSChris Mason ret = -EPERM; 3126e441d54dSChris Mason goto out; 3127e441d54dSChris Mason } 3128de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3129f46b5a66SChristoph Hellwig break; 3130f46b5a66SChristoph Hellwig case S_IFREG: 3131616d374eSAdam Borowski /* 3132616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3133616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3134616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3135616d374eSAdam Borowski */ 3136616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3137616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3138616d374eSAdam Borowski ret = -EPERM; 3139e441d54dSChris Mason goto out; 3140e441d54dSChris Mason } 31411e701a32SChris Mason 31421e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31431e701a32SChris Mason if (!range) { 31441e701a32SChris Mason ret = -ENOMEM; 31451e701a32SChris Mason goto out; 31461e701a32SChris Mason } 31471e701a32SChris Mason 31481e701a32SChris Mason if (argp) { 31491e701a32SChris Mason if (copy_from_user(range, argp, 31501e701a32SChris Mason sizeof(*range))) { 31511e701a32SChris Mason ret = -EFAULT; 31521e701a32SChris Mason kfree(range); 3153683be16eSDan Carpenter goto out; 31541e701a32SChris Mason } 31551e701a32SChris Mason /* compression requires us to start the IO */ 31561e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31571e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31581e701a32SChris Mason range->extent_thresh = (u32)-1; 31591e701a32SChris Mason } 31601e701a32SChris Mason } else { 31611e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31621e701a32SChris Mason range->len = (u64)-1; 31631e701a32SChris Mason } 3164496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31657c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31664cb5300bSChris Mason if (ret > 0) 31674cb5300bSChris Mason ret = 0; 31681e701a32SChris Mason kfree(range); 3169f46b5a66SChristoph Hellwig break; 31708929ecfaSYan, Zheng default: 31718929ecfaSYan, Zheng ret = -EINVAL; 3172f46b5a66SChristoph Hellwig } 3173e441d54dSChris Mason out: 317425122d15SIlya Dryomov mnt_drop_write_file(file); 3175e441d54dSChris Mason return ret; 3176f46b5a66SChristoph Hellwig } 3177f46b5a66SChristoph Hellwig 31782ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3179f46b5a66SChristoph Hellwig { 3180f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3181f46b5a66SChristoph Hellwig int ret; 3182f46b5a66SChristoph Hellwig 3183e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3184e441d54dSChris Mason return -EPERM; 3185e441d54dSChris Mason 3186c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3187e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3188c9e9f97bSIlya Dryomov 3189dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3190c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3191c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3192c9e9f97bSIlya Dryomov goto out; 3193c9e9f97bSIlya Dryomov } 3194f46b5a66SChristoph Hellwig 31955516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 31962ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3197f46b5a66SChristoph Hellwig 319843d20761SAnand Jain if (!ret) 31990b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 320043d20761SAnand Jain 3201f46b5a66SChristoph Hellwig kfree(vol_args); 3202c9e9f97bSIlya Dryomov out: 3203c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3204f46b5a66SChristoph Hellwig return ret; 3205f46b5a66SChristoph Hellwig } 3206f46b5a66SChristoph Hellwig 32076b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3208f46b5a66SChristoph Hellwig { 32090b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32116b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3212f46b5a66SChristoph Hellwig int ret; 3213f46b5a66SChristoph Hellwig 3214e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3215e441d54dSChris Mason return -EPERM; 3216e441d54dSChris Mason 3217da24927bSMiao Xie ret = mnt_want_write_file(file); 3218da24927bSMiao Xie if (ret) 3219da24927bSMiao Xie return ret; 3220c146afadSYan Zheng 3221dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3222c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3223c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3224c47ca32dSDan Carpenter goto err_drop; 3225c9e9f97bSIlya Dryomov } 3226f46b5a66SChristoph Hellwig 3227748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3228fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3229fd4e994bSOmar Sandoval goto out; 3230fd4e994bSOmar Sandoval } 3231f46b5a66SChristoph Hellwig 3232c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3233183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3234183860f6SAnand Jain goto out; 3235183860f6SAnand Jain } 3236183860f6SAnand Jain 3237735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 32382ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 32396b526ed7SAnand Jain } else { 32406b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 32412ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 32426b526ed7SAnand Jain } 3243c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3244183860f6SAnand Jain 32456b526ed7SAnand Jain if (!ret) { 3246735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32470b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32486b526ed7SAnand Jain vol_args->devid); 32496b526ed7SAnand Jain else 32500b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32516b526ed7SAnand Jain vol_args->name); 32526b526ed7SAnand Jain } 3253183860f6SAnand Jain out: 3254183860f6SAnand Jain kfree(vol_args); 3255c47ca32dSDan Carpenter err_drop: 32564ac20c70SIlya Dryomov mnt_drop_write_file(file); 3257f46b5a66SChristoph Hellwig return ret; 3258f46b5a66SChristoph Hellwig } 3259f46b5a66SChristoph Hellwig 3260f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3261f46b5a66SChristoph Hellwig { 32620b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32630b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3264f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3265f46b5a66SChristoph Hellwig int ret; 3266f46b5a66SChristoph Hellwig 3267f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3268f46b5a66SChristoph Hellwig return -EPERM; 3269f46b5a66SChristoph Hellwig 3270f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3271f46b5a66SChristoph Hellwig if (ret) 3272f46b5a66SChristoph Hellwig return ret; 3273f46b5a66SChristoph Hellwig 3274c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3275f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 327658d7bbf8SDavid Sterba goto out_drop_write; 327758d7bbf8SDavid Sterba } 327858d7bbf8SDavid Sterba 327958d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 328058d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 328158d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3282f46b5a66SChristoph Hellwig goto out; 3283f46b5a66SChristoph Hellwig } 3284f46b5a66SChristoph Hellwig 328558d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32862ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3287f46b5a66SChristoph Hellwig 3288f46b5a66SChristoph Hellwig if (!ret) 32890b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3290f46b5a66SChristoph Hellwig kfree(vol_args); 329158d7bbf8SDavid Sterba out: 3292c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 329358d7bbf8SDavid Sterba out_drop_write: 3294f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 329558d7bbf8SDavid Sterba 3296f46b5a66SChristoph Hellwig return ret; 3297f46b5a66SChristoph Hellwig } 3298f46b5a66SChristoph Hellwig 32992ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33002ff7e61eSJeff Mahoney void __user *arg) 3301475f6387SJan Schmidt { 3302027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3303475f6387SJan Schmidt struct btrfs_device *device; 33040b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3305137c5418SJohannes Thumshirn u64 flags_in; 3306027ed2f0SLi Zefan int ret = 0; 3307475f6387SJan Schmidt 3308137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3309137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3310137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3311137c5418SJohannes Thumshirn 3312137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3313137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3314027ed2f0SLi Zefan 3315d03262c7SDavid Sterba rcu_read_lock(); 3316027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3317475f6387SJan Schmidt 3318d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3319027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3320027ed2f0SLi Zefan fi_args->max_id = device->devid; 3321475f6387SJan Schmidt } 3322d03262c7SDavid Sterba rcu_read_unlock(); 3323475f6387SJan Schmidt 3324de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3325bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3326bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3327bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 332880a773fbSDavid Sterba 3329137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3330137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3331137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3332137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3333137c5418SJohannes Thumshirn } 3334137c5418SJohannes Thumshirn 33350fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33360fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33370fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33380fb408a5SJohannes Thumshirn } 33390fb408a5SJohannes Thumshirn 334049bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 334149bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 334249bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 334349bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 334449bac897SJohannes Thumshirn } 334549bac897SJohannes Thumshirn 3346027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3347027ed2f0SLi Zefan ret = -EFAULT; 3348475f6387SJan Schmidt 3349027ed2f0SLi Zefan kfree(fi_args); 3350027ed2f0SLi Zefan return ret; 3351475f6387SJan Schmidt } 3352475f6387SJan Schmidt 33532ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33542ff7e61eSJeff Mahoney void __user *arg) 3355475f6387SJan Schmidt { 3356475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3357475f6387SJan Schmidt struct btrfs_device *dev; 3358475f6387SJan Schmidt int ret = 0; 3359475f6387SJan Schmidt char *s_uuid = NULL; 3360475f6387SJan Schmidt 3361475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3362475f6387SJan Schmidt if (IS_ERR(di_args)) 3363475f6387SJan Schmidt return PTR_ERR(di_args); 3364475f6387SJan Schmidt 3365dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3366475f6387SJan Schmidt s_uuid = di_args->uuid; 3367475f6387SJan Schmidt 3368c5593ca3SDavid Sterba rcu_read_lock(); 3369e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3370b2598edfSAnand Jain NULL); 3371475f6387SJan Schmidt 3372475f6387SJan Schmidt if (!dev) { 3373475f6387SJan Schmidt ret = -ENODEV; 3374475f6387SJan Schmidt goto out; 3375475f6387SJan Schmidt } 3376475f6387SJan Schmidt 3377475f6387SJan Schmidt di_args->devid = dev->devid; 33787cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33797cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3380475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3381a27202fbSJim Meyering if (dev->name) { 3382672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3383672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3384a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3385a27202fbSJim Meyering } else { 338699ba55adSStefan Behrens di_args->path[0] = '\0'; 3387a27202fbSJim Meyering } 3388475f6387SJan Schmidt 3389475f6387SJan Schmidt out: 3390c5593ca3SDavid Sterba rcu_read_unlock(); 3391475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3392475f6387SJan Schmidt ret = -EFAULT; 3393475f6387SJan Schmidt 3394475f6387SJan Schmidt kfree(di_args); 3395475f6387SJan Schmidt return ret; 3396475f6387SJan Schmidt } 3397475f6387SJan Schmidt 33986ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 33996ef5ed0dSJosef Bacik { 3400496ad9aaSAl Viro struct inode *inode = file_inode(file); 34010b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34026ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34036ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34046ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34056ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34062a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34076ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34086ef5ed0dSJosef Bacik u64 objectid = 0; 34096ef5ed0dSJosef Bacik u64 dir_id; 34103c04ce01SMiao Xie int ret; 34116ef5ed0dSJosef Bacik 34126ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34136ef5ed0dSJosef Bacik return -EPERM; 34146ef5ed0dSJosef Bacik 34153c04ce01SMiao Xie ret = mnt_want_write_file(file); 34163c04ce01SMiao Xie if (ret) 34173c04ce01SMiao Xie return ret; 34183c04ce01SMiao Xie 34193c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34203c04ce01SMiao Xie ret = -EFAULT; 34213c04ce01SMiao Xie goto out; 34223c04ce01SMiao Xie } 34236ef5ed0dSJosef Bacik 34246ef5ed0dSJosef Bacik if (!objectid) 34251cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34266ef5ed0dSJosef Bacik 342756e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34283c04ce01SMiao Xie if (IS_ERR(new_root)) { 34293c04ce01SMiao Xie ret = PTR_ERR(new_root); 34303c04ce01SMiao Xie goto out; 34313c04ce01SMiao Xie } 34322a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34332a2b5d62SJosef Bacik ret = -ENOENT; 34342a2b5d62SJosef Bacik goto out_free; 34352a2b5d62SJosef Bacik } 34366ef5ed0dSJosef Bacik 34376ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34383c04ce01SMiao Xie if (!path) { 34393c04ce01SMiao Xie ret = -ENOMEM; 34402a2b5d62SJosef Bacik goto out_free; 34413c04ce01SMiao Xie } 34426ef5ed0dSJosef Bacik 34436ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 344498d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34453c04ce01SMiao Xie ret = PTR_ERR(trans); 34462a2b5d62SJosef Bacik goto out_free; 34476ef5ed0dSJosef Bacik } 34486ef5ed0dSJosef Bacik 34490b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34500b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34516ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3452cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34532a2b5d62SJosef Bacik btrfs_release_path(path); 34543a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34550b246afaSJeff Mahoney btrfs_err(fs_info, 34565d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34573c04ce01SMiao Xie ret = -ENOENT; 34582a2b5d62SJosef Bacik goto out_free; 34596ef5ed0dSJosef Bacik } 34606ef5ed0dSJosef Bacik 34616ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34626ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34636ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34642a2b5d62SJosef Bacik btrfs_release_path(path); 34656ef5ed0dSJosef Bacik 34660b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34673a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34682a2b5d62SJosef Bacik out_free: 346900246528SJosef Bacik btrfs_put_root(new_root); 34702a2b5d62SJosef Bacik btrfs_free_path(path); 34713c04ce01SMiao Xie out: 34723c04ce01SMiao Xie mnt_drop_write_file(file); 34733c04ce01SMiao Xie return ret; 34746ef5ed0dSJosef Bacik } 34756ef5ed0dSJosef Bacik 3476c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3477bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3478bf5fc093SJosef Bacik { 347932da5386SDavid Sterba struct btrfs_block_group *block_group; 3480bf5fc093SJosef Bacik 3481bf5fc093SJosef Bacik space->total_bytes = 0; 3482bf5fc093SJosef Bacik space->used_bytes = 0; 3483bf5fc093SJosef Bacik space->flags = 0; 3484bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3485bf5fc093SJosef Bacik space->flags = block_group->flags; 3486b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3487bf38be65SDavid Sterba space->used_bytes += block_group->used; 3488bf5fc093SJosef Bacik } 3489bf5fc093SJosef Bacik } 3490bf5fc093SJosef Bacik 34912ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34922ff7e61eSJeff Mahoney void __user *arg) 34931406e432SJosef Bacik { 34941406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 34951406e432SJosef Bacik struct btrfs_ioctl_space_info space; 34961406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 34977fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 349813f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 34991406e432SJosef Bacik struct btrfs_space_info *info; 3500315d8e98SColin Ian King static const u64 types[] = { 3501315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3502bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3503bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3504315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3505315d8e98SColin Ian King }; 3506bf5fc093SJosef Bacik int num_types = 4; 35077fde62bfSChris Mason int alloc_size; 35081406e432SJosef Bacik int ret = 0; 350951788b1bSDan Rosenberg u64 slot_count = 0; 3510bf5fc093SJosef Bacik int i, c; 35111406e432SJosef Bacik 35121406e432SJosef Bacik if (copy_from_user(&space_args, 35131406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35141406e432SJosef Bacik sizeof(space_args))) 35151406e432SJosef Bacik return -EFAULT; 35161406e432SJosef Bacik 3517bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3518bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3519bf5fc093SJosef Bacik 3520bf5fc093SJosef Bacik info = NULL; 352172804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3522bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3523bf5fc093SJosef Bacik info = tmp; 3524bf5fc093SJosef Bacik break; 3525bf5fc093SJosef Bacik } 3526bf5fc093SJosef Bacik } 35271406e432SJosef Bacik 3528bf5fc093SJosef Bacik if (!info) 3529bf5fc093SJosef Bacik continue; 3530bf5fc093SJosef Bacik 3531bf5fc093SJosef Bacik down_read(&info->groups_sem); 3532bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3533bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3534bf5fc093SJosef Bacik slot_count++; 3535bf5fc093SJosef Bacik } 3536bf5fc093SJosef Bacik up_read(&info->groups_sem); 3537bf5fc093SJosef Bacik } 3538bf5fc093SJosef Bacik 353936523e95SDavid Sterba /* 354036523e95SDavid Sterba * Global block reserve, exported as a space_info 354136523e95SDavid Sterba */ 354236523e95SDavid Sterba slot_count++; 354336523e95SDavid Sterba 35447fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35457fde62bfSChris Mason if (space_args.space_slots == 0) { 35467fde62bfSChris Mason space_args.total_spaces = slot_count; 35477fde62bfSChris Mason goto out; 35487fde62bfSChris Mason } 3549bf5fc093SJosef Bacik 355051788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3551bf5fc093SJosef Bacik 35527fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3553bf5fc093SJosef Bacik 35547fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35557fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35567fde62bfSChris Mason */ 355709cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35587fde62bfSChris Mason return -ENOMEM; 35597fde62bfSChris Mason 35607fde62bfSChris Mason space_args.total_spaces = 0; 35618d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35627fde62bfSChris Mason if (!dest) 35637fde62bfSChris Mason return -ENOMEM; 35647fde62bfSChris Mason dest_orig = dest; 35657fde62bfSChris Mason 35667fde62bfSChris Mason /* now we have a buffer to copy into */ 3567bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3568bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3569bf5fc093SJosef Bacik 357051788b1bSDan Rosenberg if (!slot_count) 357151788b1bSDan Rosenberg break; 357251788b1bSDan Rosenberg 3573bf5fc093SJosef Bacik info = NULL; 357472804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3575bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3576bf5fc093SJosef Bacik info = tmp; 35777fde62bfSChris Mason break; 3578bf5fc093SJosef Bacik } 3579bf5fc093SJosef Bacik } 35807fde62bfSChris Mason 3581bf5fc093SJosef Bacik if (!info) 3582bf5fc093SJosef Bacik continue; 3583bf5fc093SJosef Bacik down_read(&info->groups_sem); 3584bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3585bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3586c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3587c065f5b1SSu Yue &space); 35887fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35891406e432SJosef Bacik dest++; 35901406e432SJosef Bacik space_args.total_spaces++; 359151788b1bSDan Rosenberg slot_count--; 35921406e432SJosef Bacik } 359351788b1bSDan Rosenberg if (!slot_count) 359451788b1bSDan Rosenberg break; 3595bf5fc093SJosef Bacik } 3596bf5fc093SJosef Bacik up_read(&info->groups_sem); 3597bf5fc093SJosef Bacik } 35981406e432SJosef Bacik 359936523e95SDavid Sterba /* 360036523e95SDavid Sterba * Add global block reserve 360136523e95SDavid Sterba */ 360236523e95SDavid Sterba if (slot_count) { 36030b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 360436523e95SDavid Sterba 360536523e95SDavid Sterba spin_lock(&block_rsv->lock); 360636523e95SDavid Sterba space.total_bytes = block_rsv->size; 360736523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 360836523e95SDavid Sterba spin_unlock(&block_rsv->lock); 360936523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 361036523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 361136523e95SDavid Sterba space_args.total_spaces++; 361236523e95SDavid Sterba } 361336523e95SDavid Sterba 36142eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36157fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36167fde62bfSChris Mason 36177fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36187fde62bfSChris Mason ret = -EFAULT; 36197fde62bfSChris Mason 36207fde62bfSChris Mason kfree(dest_orig); 36217fde62bfSChris Mason out: 36227fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36231406e432SJosef Bacik ret = -EFAULT; 36241406e432SJosef Bacik 36251406e432SJosef Bacik return ret; 36261406e432SJosef Bacik } 36271406e432SJosef Bacik 36289a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36299a8c28beSMiao Xie void __user *argp) 363046204592SSage Weil { 363146204592SSage Weil struct btrfs_trans_handle *trans; 363246204592SSage Weil u64 transid; 3633db5b493aSTsutomu Itoh int ret; 363446204592SSage Weil 3635d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3636ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3637ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 363898d5dc13STsutomu Itoh return PTR_ERR(trans); 3639ff7c1d33SMiao Xie 3640ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3641ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3642ff7c1d33SMiao Xie goto out; 3643ff7c1d33SMiao Xie } 364446204592SSage Weil transid = trans->transid; 36453a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36468b2b2d3cSTsutomu Itoh if (ret) { 36473a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3648db5b493aSTsutomu Itoh return ret; 36498b2b2d3cSTsutomu Itoh } 3650ff7c1d33SMiao Xie out: 365146204592SSage Weil if (argp) 365246204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 365346204592SSage Weil return -EFAULT; 365446204592SSage Weil return 0; 365546204592SSage Weil } 365646204592SSage Weil 36572ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36589a8c28beSMiao Xie void __user *argp) 365946204592SSage Weil { 366046204592SSage Weil u64 transid; 366146204592SSage Weil 366246204592SSage Weil if (argp) { 366346204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 366446204592SSage Weil return -EFAULT; 366546204592SSage Weil } else { 366646204592SSage Weil transid = 0; /* current trans */ 366746204592SSage Weil } 36682ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 366946204592SSage Weil } 367046204592SSage Weil 3671b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3672475f6387SJan Schmidt { 36730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3674475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3675b8e95489SMiao Xie int ret; 3676475f6387SJan Schmidt 3677475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3678475f6387SJan Schmidt return -EPERM; 3679475f6387SJan Schmidt 3680475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3681475f6387SJan Schmidt if (IS_ERR(sa)) 3682475f6387SJan Schmidt return PTR_ERR(sa); 3683475f6387SJan Schmidt 3684b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3685b8e95489SMiao Xie ret = mnt_want_write_file(file); 3686b8e95489SMiao Xie if (ret) 3687b8e95489SMiao Xie goto out; 3688b8e95489SMiao Xie } 3689b8e95489SMiao Xie 36900b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 369163a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 369263a212abSStefan Behrens 0); 3693475f6387SJan Schmidt 36945afe6ce7SFilipe Manana /* 36955afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 36965afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 36975afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 36985afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 36995afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37005afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37015afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37025afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37035afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37045afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37055afe6ce7SFilipe Manana */ 37065afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3707475f6387SJan Schmidt ret = -EFAULT; 3708475f6387SJan Schmidt 3709b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3710b8e95489SMiao Xie mnt_drop_write_file(file); 3711b8e95489SMiao Xie out: 3712475f6387SJan Schmidt kfree(sa); 3713475f6387SJan Schmidt return ret; 3714475f6387SJan Schmidt } 3715475f6387SJan Schmidt 37162ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3717475f6387SJan Schmidt { 3718475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3719475f6387SJan Schmidt return -EPERM; 3720475f6387SJan Schmidt 37212ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3722475f6387SJan Schmidt } 3723475f6387SJan Schmidt 37242ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3725475f6387SJan Schmidt void __user *arg) 3726475f6387SJan Schmidt { 3727475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3728475f6387SJan Schmidt int ret; 3729475f6387SJan Schmidt 3730475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3731475f6387SJan Schmidt return -EPERM; 3732475f6387SJan Schmidt 3733475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3734475f6387SJan Schmidt if (IS_ERR(sa)) 3735475f6387SJan Schmidt return PTR_ERR(sa); 3736475f6387SJan Schmidt 37372ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3738475f6387SJan Schmidt 37394fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3740475f6387SJan Schmidt ret = -EFAULT; 3741475f6387SJan Schmidt 3742475f6387SJan Schmidt kfree(sa); 3743475f6387SJan Schmidt return ret; 3744475f6387SJan Schmidt } 3745475f6387SJan Schmidt 37462ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3747b27f7c0cSDavid Sterba void __user *arg) 3748c11d2c23SStefan Behrens { 3749c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3750c11d2c23SStefan Behrens int ret; 3751c11d2c23SStefan Behrens 3752c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3753c11d2c23SStefan Behrens if (IS_ERR(sa)) 3754c11d2c23SStefan Behrens return PTR_ERR(sa); 3755c11d2c23SStefan Behrens 3756b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3757b27f7c0cSDavid Sterba kfree(sa); 3758b27f7c0cSDavid Sterba return -EPERM; 3759b27f7c0cSDavid Sterba } 3760b27f7c0cSDavid Sterba 37612ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3762c11d2c23SStefan Behrens 3763eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3764c11d2c23SStefan Behrens ret = -EFAULT; 3765c11d2c23SStefan Behrens 3766c11d2c23SStefan Behrens kfree(sa); 3767c11d2c23SStefan Behrens return ret; 3768c11d2c23SStefan Behrens } 3769c11d2c23SStefan Behrens 37702ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37712ff7e61eSJeff Mahoney void __user *arg) 37723f6bcfbdSStefan Behrens { 37733f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37743f6bcfbdSStefan Behrens int ret; 37753f6bcfbdSStefan Behrens 37763f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37773f6bcfbdSStefan Behrens return -EPERM; 37783f6bcfbdSStefan Behrens 37793f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37803f6bcfbdSStefan Behrens if (IS_ERR(p)) 37813f6bcfbdSStefan Behrens return PTR_ERR(p); 37823f6bcfbdSStefan Behrens 37833f6bcfbdSStefan Behrens switch (p->cmd) { 37843f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3785bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3786adfa97cbSIlya Dryomov ret = -EROFS; 3787adfa97cbSIlya Dryomov goto out; 3788adfa97cbSIlya Dryomov } 3789c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3790e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37913f6bcfbdSStefan Behrens } else { 37922ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3793c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 37943f6bcfbdSStefan Behrens } 37953f6bcfbdSStefan Behrens break; 37963f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 37970b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 37983f6bcfbdSStefan Behrens ret = 0; 37993f6bcfbdSStefan Behrens break; 38003f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 380117d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 380297282031SAnand Jain ret = 0; 38033f6bcfbdSStefan Behrens break; 38043f6bcfbdSStefan Behrens default: 38053f6bcfbdSStefan Behrens ret = -EINVAL; 38063f6bcfbdSStefan Behrens break; 38073f6bcfbdSStefan Behrens } 38083f6bcfbdSStefan Behrens 3809d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38103f6bcfbdSStefan Behrens ret = -EFAULT; 3811adfa97cbSIlya Dryomov out: 38123f6bcfbdSStefan Behrens kfree(p); 38133f6bcfbdSStefan Behrens return ret; 38143f6bcfbdSStefan Behrens } 38153f6bcfbdSStefan Behrens 3816d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3817d7728c96SJan Schmidt { 3818d7728c96SJan Schmidt int ret = 0; 3819d7728c96SJan Schmidt int i; 3820740c3d22SChris Mason u64 rel_ptr; 3821d7728c96SJan Schmidt int size; 3822806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3823d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3824d7728c96SJan Schmidt struct btrfs_path *path; 3825d7728c96SJan Schmidt 382682b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3827d7728c96SJan Schmidt return -EPERM; 3828d7728c96SJan Schmidt 3829d7728c96SJan Schmidt path = btrfs_alloc_path(); 3830d7728c96SJan Schmidt if (!path) { 3831d7728c96SJan Schmidt ret = -ENOMEM; 3832d7728c96SJan Schmidt goto out; 3833d7728c96SJan Schmidt } 3834d7728c96SJan Schmidt 3835d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3836d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3837d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3838d7728c96SJan Schmidt ipa = NULL; 3839d7728c96SJan Schmidt goto out; 3840d7728c96SJan Schmidt } 3841d7728c96SJan Schmidt 3842d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3843d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3844d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3845d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3846d7728c96SJan Schmidt ipath = NULL; 3847d7728c96SJan Schmidt goto out; 3848d7728c96SJan Schmidt } 3849d7728c96SJan Schmidt 3850d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3851d7728c96SJan Schmidt if (ret < 0) 3852d7728c96SJan Schmidt goto out; 3853d7728c96SJan Schmidt 3854d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3855745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3856745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3857740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3858d7728c96SJan Schmidt } 3859d7728c96SJan Schmidt 3860718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3861718dc5faSOmar Sandoval ipath->fspath, size); 3862d7728c96SJan Schmidt if (ret) { 3863d7728c96SJan Schmidt ret = -EFAULT; 3864d7728c96SJan Schmidt goto out; 3865d7728c96SJan Schmidt } 3866d7728c96SJan Schmidt 3867d7728c96SJan Schmidt out: 3868d7728c96SJan Schmidt btrfs_free_path(path); 3869d7728c96SJan Schmidt free_ipath(ipath); 3870d7728c96SJan Schmidt kfree(ipa); 3871d7728c96SJan Schmidt 3872d7728c96SJan Schmidt return ret; 3873d7728c96SJan Schmidt } 3874d7728c96SJan Schmidt 3875d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3876d7728c96SJan Schmidt { 3877d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3878d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3879d7728c96SJan Schmidt 3880d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3881d7728c96SJan Schmidt inodes->bytes_left -= c; 3882d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3883d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3884d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3885d7728c96SJan Schmidt inodes->elem_cnt += 3; 3886d7728c96SJan Schmidt } else { 3887d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3888d7728c96SJan Schmidt inodes->bytes_left = 0; 3889d7728c96SJan Schmidt inodes->elem_missed += 3; 3890d7728c96SJan Schmidt } 3891d7728c96SJan Schmidt 3892d7728c96SJan Schmidt return 0; 3893d7728c96SJan Schmidt } 3894d7728c96SJan Schmidt 38952ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3896d24a67b2SZygo Blaxell void __user *arg, int version) 3897d7728c96SJan Schmidt { 3898d7728c96SJan Schmidt int ret = 0; 3899d7728c96SJan Schmidt int size; 3900d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3901d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3902d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3903d24a67b2SZygo Blaxell bool ignore_offset; 3904d7728c96SJan Schmidt 3905d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3906d7728c96SJan Schmidt return -EPERM; 3907d7728c96SJan Schmidt 3908d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39097b9ea627SShailendra Verma if (IS_ERR(loi)) 39107b9ea627SShailendra Verma return PTR_ERR(loi); 3911d7728c96SJan Schmidt 3912d24a67b2SZygo Blaxell if (version == 1) { 3913d24a67b2SZygo Blaxell ignore_offset = false; 3914b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3915d24a67b2SZygo Blaxell } else { 3916d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3917d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3918d24a67b2SZygo Blaxell ret = -EINVAL; 3919d24a67b2SZygo Blaxell goto out_loi; 3920d24a67b2SZygo Blaxell } 3921d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3922d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3923d24a67b2SZygo Blaxell ret = -EINVAL; 3924d24a67b2SZygo Blaxell goto out_loi; 3925d24a67b2SZygo Blaxell } 3926d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3927b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3928d24a67b2SZygo Blaxell } 3929d24a67b2SZygo Blaxell 3930d7728c96SJan Schmidt path = btrfs_alloc_path(); 3931d7728c96SJan Schmidt if (!path) { 3932d7728c96SJan Schmidt ret = -ENOMEM; 3933d7728c96SJan Schmidt goto out; 3934d7728c96SJan Schmidt } 3935d7728c96SJan Schmidt 3936d7728c96SJan Schmidt inodes = init_data_container(size); 3937d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3938d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3939d7728c96SJan Schmidt inodes = NULL; 3940d7728c96SJan Schmidt goto out; 3941d7728c96SJan Schmidt } 3942d7728c96SJan Schmidt 39432ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3944d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3945df031f07SLiu Bo if (ret == -EINVAL) 3946d7728c96SJan Schmidt ret = -ENOENT; 3947d7728c96SJan Schmidt if (ret < 0) 3948d7728c96SJan Schmidt goto out; 3949d7728c96SJan Schmidt 3950718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3951718dc5faSOmar Sandoval size); 3952d7728c96SJan Schmidt if (ret) 3953d7728c96SJan Schmidt ret = -EFAULT; 3954d7728c96SJan Schmidt 3955d7728c96SJan Schmidt out: 3956d7728c96SJan Schmidt btrfs_free_path(path); 3957f54de068SDavid Sterba kvfree(inodes); 3958d24a67b2SZygo Blaxell out_loi: 3959d7728c96SJan Schmidt kfree(loi); 3960d7728c96SJan Schmidt 3961d7728c96SJan Schmidt return ret; 3962d7728c96SJan Schmidt } 3963d7728c96SJan Schmidt 3964008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3965c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3966c9e9f97bSIlya Dryomov { 3967c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3968c9e9f97bSIlya Dryomov 3969c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3970c9e9f97bSIlya Dryomov 39713009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3972837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3973837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3974837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3975a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3976a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3977837d5b6eSIlya Dryomov 3978c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3979c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3980c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 398119a39dceSIlya Dryomov 398219a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 398319a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 398419a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3985c9e9f97bSIlya Dryomov } 3986c9e9f97bSIlya Dryomov 39879ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3988c9e9f97bSIlya Dryomov { 3989496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3990c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3991c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3992c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3993ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 3994c9e9f97bSIlya Dryomov int ret; 3995c9e9f97bSIlya Dryomov 3996c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 3997c9e9f97bSIlya Dryomov return -EPERM; 3998c9e9f97bSIlya Dryomov 3999e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40009ba1f6e4SLiu Bo if (ret) 40019ba1f6e4SLiu Bo return ret; 40029ba1f6e4SLiu Bo 4003ed0fb78fSIlya Dryomov again: 4004c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4005c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4006ed0fb78fSIlya Dryomov need_unlock = true; 4007ed0fb78fSIlya Dryomov goto locked; 4008ed0fb78fSIlya Dryomov } 4009ed0fb78fSIlya Dryomov 4010ed0fb78fSIlya Dryomov /* 401101327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4012ed0fb78fSIlya Dryomov * (1) some other op is running 4013ed0fb78fSIlya Dryomov * (2) balance is running 4014ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4015ed0fb78fSIlya Dryomov */ 4016ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4017ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4018ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40193009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4020ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4021dccdb07bSDavid Sterba /* 4022dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4023dccdb07bSDavid Sterba * we'll reexamine the status again. 4024dccdb07bSDavid Sterba */ 4025ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4026ed0fb78fSIlya Dryomov 4027ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40283009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4029ed0fb78fSIlya Dryomov /* this is (3) */ 4030ed0fb78fSIlya Dryomov need_unlock = false; 4031ed0fb78fSIlya Dryomov goto locked; 4032ed0fb78fSIlya Dryomov } 4033ed0fb78fSIlya Dryomov 4034ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4035ed0fb78fSIlya Dryomov goto again; 4036ed0fb78fSIlya Dryomov } else { 4037ed0fb78fSIlya Dryomov /* this is (2) */ 4038ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4039ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4040ed0fb78fSIlya Dryomov goto out; 4041ed0fb78fSIlya Dryomov } 4042ed0fb78fSIlya Dryomov } else { 4043ed0fb78fSIlya Dryomov /* this is (1) */ 4044ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4045e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4046ed0fb78fSIlya Dryomov goto out; 4047ed0fb78fSIlya Dryomov } 4048ed0fb78fSIlya Dryomov 4049ed0fb78fSIlya Dryomov locked: 4050c9e9f97bSIlya Dryomov 4051c9e9f97bSIlya Dryomov if (arg) { 4052c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4053c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4054c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4055ed0fb78fSIlya Dryomov goto out_unlock; 4056c9e9f97bSIlya Dryomov } 4057de322263SIlya Dryomov 4058de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4059de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4060de322263SIlya Dryomov ret = -ENOTCONN; 4061de322263SIlya Dryomov goto out_bargs; 4062de322263SIlya Dryomov } 4063de322263SIlya Dryomov 4064de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4065de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4066de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4067de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4068de322263SIlya Dryomov 4069de322263SIlya Dryomov goto do_balance; 4070de322263SIlya Dryomov } 4071c9e9f97bSIlya Dryomov } else { 4072c9e9f97bSIlya Dryomov bargs = NULL; 4073c9e9f97bSIlya Dryomov } 4074c9e9f97bSIlya Dryomov 4075ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4076837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4077837d5b6eSIlya Dryomov goto out_bargs; 4078837d5b6eSIlya Dryomov } 4079837d5b6eSIlya Dryomov 40808d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4081c9e9f97bSIlya Dryomov if (!bctl) { 4082c9e9f97bSIlya Dryomov ret = -ENOMEM; 4083c9e9f97bSIlya Dryomov goto out_bargs; 4084c9e9f97bSIlya Dryomov } 4085c9e9f97bSIlya Dryomov 4086c9e9f97bSIlya Dryomov if (arg) { 4087c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4088c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4089c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4090c9e9f97bSIlya Dryomov 4091c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4092f43ffb60SIlya Dryomov } else { 4093f43ffb60SIlya Dryomov /* balance everything - no filters */ 4094f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4095c9e9f97bSIlya Dryomov } 4096c9e9f97bSIlya Dryomov 40978eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 40988eb93459SDavid Sterba ret = -EINVAL; 40990f89abf5SChristian Engelmayer goto out_bctl; 41008eb93459SDavid Sterba } 41018eb93459SDavid Sterba 4102de322263SIlya Dryomov do_balance: 4103c9e9f97bSIlya Dryomov /* 4104c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4105c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4106c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4107c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4108c9e9f97bSIlya Dryomov */ 4109ed0fb78fSIlya Dryomov need_unlock = false; 4110ed0fb78fSIlya Dryomov 41116fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41120f89abf5SChristian Engelmayer bctl = NULL; 4113ed0fb78fSIlya Dryomov 4114d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4115c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4116c9e9f97bSIlya Dryomov ret = -EFAULT; 4117c9e9f97bSIlya Dryomov } 4118c9e9f97bSIlya Dryomov 41190f89abf5SChristian Engelmayer out_bctl: 41200f89abf5SChristian Engelmayer kfree(bctl); 4121c9e9f97bSIlya Dryomov out_bargs: 4122c9e9f97bSIlya Dryomov kfree(bargs); 4123ed0fb78fSIlya Dryomov out_unlock: 4124c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4125ed0fb78fSIlya Dryomov if (need_unlock) 4126c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4127ed0fb78fSIlya Dryomov out: 4128e54bfa31SLiu Bo mnt_drop_write_file(file); 4129c9e9f97bSIlya Dryomov return ret; 4130c9e9f97bSIlya Dryomov } 4131c9e9f97bSIlya Dryomov 41322ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4133837d5b6eSIlya Dryomov { 4134837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4135837d5b6eSIlya Dryomov return -EPERM; 4136837d5b6eSIlya Dryomov 4137837d5b6eSIlya Dryomov switch (cmd) { 4138837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41390b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4140a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41410b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4142837d5b6eSIlya Dryomov } 4143837d5b6eSIlya Dryomov 4144837d5b6eSIlya Dryomov return -EINVAL; 4145837d5b6eSIlya Dryomov } 4146837d5b6eSIlya Dryomov 41472ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 414819a39dceSIlya Dryomov void __user *arg) 414919a39dceSIlya Dryomov { 415019a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 415119a39dceSIlya Dryomov int ret = 0; 415219a39dceSIlya Dryomov 415319a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 415419a39dceSIlya Dryomov return -EPERM; 415519a39dceSIlya Dryomov 415619a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 415719a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 415819a39dceSIlya Dryomov ret = -ENOTCONN; 415919a39dceSIlya Dryomov goto out; 416019a39dceSIlya Dryomov } 416119a39dceSIlya Dryomov 41628d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 416319a39dceSIlya Dryomov if (!bargs) { 416419a39dceSIlya Dryomov ret = -ENOMEM; 416519a39dceSIlya Dryomov goto out; 416619a39dceSIlya Dryomov } 416719a39dceSIlya Dryomov 4168008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 416919a39dceSIlya Dryomov 417019a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 417119a39dceSIlya Dryomov ret = -EFAULT; 417219a39dceSIlya Dryomov 417319a39dceSIlya Dryomov kfree(bargs); 417419a39dceSIlya Dryomov out: 417519a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 417619a39dceSIlya Dryomov return ret; 417719a39dceSIlya Dryomov } 417819a39dceSIlya Dryomov 4179905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41805d13a37bSArne Jansen { 41810b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41820b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41835d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41845d13a37bSArne Jansen int ret; 41855d13a37bSArne Jansen 41865d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41875d13a37bSArne Jansen return -EPERM; 41885d13a37bSArne Jansen 4189905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4190905b0ddaSMiao Xie if (ret) 4191905b0ddaSMiao Xie return ret; 41925d13a37bSArne Jansen 41935d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4194905b0ddaSMiao Xie if (IS_ERR(sa)) { 4195905b0ddaSMiao Xie ret = PTR_ERR(sa); 4196905b0ddaSMiao Xie goto drop_write; 4197905b0ddaSMiao Xie } 41985d13a37bSArne Jansen 41990b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42005d13a37bSArne Jansen 42015d13a37bSArne Jansen switch (sa->cmd) { 42025d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4203340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42045d13a37bSArne Jansen break; 42055d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4206340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42075d13a37bSArne Jansen break; 42085d13a37bSArne Jansen default: 42095d13a37bSArne Jansen ret = -EINVAL; 42105d13a37bSArne Jansen break; 42115d13a37bSArne Jansen } 42125d13a37bSArne Jansen 42135d13a37bSArne Jansen kfree(sa); 42140b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4215905b0ddaSMiao Xie drop_write: 4216905b0ddaSMiao Xie mnt_drop_write_file(file); 42175d13a37bSArne Jansen return ret; 42185d13a37bSArne Jansen } 42195d13a37bSArne Jansen 4220905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42215d13a37bSArne Jansen { 42220b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42230b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42240b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42255d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42265d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42275d13a37bSArne Jansen int ret; 42285d13a37bSArne Jansen int err; 42295d13a37bSArne Jansen 42305d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42315d13a37bSArne Jansen return -EPERM; 42325d13a37bSArne Jansen 4233905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4234905b0ddaSMiao Xie if (ret) 4235905b0ddaSMiao Xie return ret; 42365d13a37bSArne Jansen 42375d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4238905b0ddaSMiao Xie if (IS_ERR(sa)) { 4239905b0ddaSMiao Xie ret = PTR_ERR(sa); 4240905b0ddaSMiao Xie goto drop_write; 4241905b0ddaSMiao Xie } 42425d13a37bSArne Jansen 42435d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42445d13a37bSArne Jansen if (IS_ERR(trans)) { 42455d13a37bSArne Jansen ret = PTR_ERR(trans); 42465d13a37bSArne Jansen goto out; 42475d13a37bSArne Jansen } 42485d13a37bSArne Jansen 42495d13a37bSArne Jansen if (sa->assign) { 42509f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42515d13a37bSArne Jansen } else { 425239616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42535d13a37bSArne Jansen } 42545d13a37bSArne Jansen 4255e082f563SQu Wenruo /* update qgroup status and info */ 4256280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4257e082f563SQu Wenruo if (err < 0) 42580b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4259ad8403dfSAnand Jain "failed to update qgroup status and info"); 42603a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42615d13a37bSArne Jansen if (err && !ret) 42625d13a37bSArne Jansen ret = err; 42635d13a37bSArne Jansen 42645d13a37bSArne Jansen out: 42655d13a37bSArne Jansen kfree(sa); 4266905b0ddaSMiao Xie drop_write: 4267905b0ddaSMiao Xie mnt_drop_write_file(file); 42685d13a37bSArne Jansen return ret; 42695d13a37bSArne Jansen } 42705d13a37bSArne Jansen 4271905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42725d13a37bSArne Jansen { 42730b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42740b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42755d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42765d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42775d13a37bSArne Jansen int ret; 42785d13a37bSArne Jansen int err; 42795d13a37bSArne Jansen 42805d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42815d13a37bSArne Jansen return -EPERM; 42825d13a37bSArne Jansen 4283905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4284905b0ddaSMiao Xie if (ret) 4285905b0ddaSMiao Xie return ret; 42865d13a37bSArne Jansen 42875d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4288905b0ddaSMiao Xie if (IS_ERR(sa)) { 4289905b0ddaSMiao Xie ret = PTR_ERR(sa); 4290905b0ddaSMiao Xie goto drop_write; 4291905b0ddaSMiao Xie } 42925d13a37bSArne Jansen 4293d86e56cfSMiao Xie if (!sa->qgroupid) { 4294d86e56cfSMiao Xie ret = -EINVAL; 4295d86e56cfSMiao Xie goto out; 4296d86e56cfSMiao Xie } 4297d86e56cfSMiao Xie 42985d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42995d13a37bSArne Jansen if (IS_ERR(trans)) { 43005d13a37bSArne Jansen ret = PTR_ERR(trans); 43015d13a37bSArne Jansen goto out; 43025d13a37bSArne Jansen } 43035d13a37bSArne Jansen 43045d13a37bSArne Jansen if (sa->create) { 430549a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43065d13a37bSArne Jansen } else { 43073efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43085d13a37bSArne Jansen } 43095d13a37bSArne Jansen 43103a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43115d13a37bSArne Jansen if (err && !ret) 43125d13a37bSArne Jansen ret = err; 43135d13a37bSArne Jansen 43145d13a37bSArne Jansen out: 43155d13a37bSArne Jansen kfree(sa); 4316905b0ddaSMiao Xie drop_write: 4317905b0ddaSMiao Xie mnt_drop_write_file(file); 43185d13a37bSArne Jansen return ret; 43195d13a37bSArne Jansen } 43205d13a37bSArne Jansen 4321905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43225d13a37bSArne Jansen { 43230b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43240b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43255d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43265d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43275d13a37bSArne Jansen int ret; 43285d13a37bSArne Jansen int err; 43295d13a37bSArne Jansen u64 qgroupid; 43305d13a37bSArne Jansen 43315d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43325d13a37bSArne Jansen return -EPERM; 43335d13a37bSArne Jansen 4334905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4335905b0ddaSMiao Xie if (ret) 4336905b0ddaSMiao Xie return ret; 43375d13a37bSArne Jansen 43385d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4339905b0ddaSMiao Xie if (IS_ERR(sa)) { 4340905b0ddaSMiao Xie ret = PTR_ERR(sa); 4341905b0ddaSMiao Xie goto drop_write; 4342905b0ddaSMiao Xie } 43435d13a37bSArne Jansen 43445d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43455d13a37bSArne Jansen if (IS_ERR(trans)) { 43465d13a37bSArne Jansen ret = PTR_ERR(trans); 43475d13a37bSArne Jansen goto out; 43485d13a37bSArne Jansen } 43495d13a37bSArne Jansen 43505d13a37bSArne Jansen qgroupid = sa->qgroupid; 43515d13a37bSArne Jansen if (!qgroupid) { 43525d13a37bSArne Jansen /* take the current subvol as qgroup */ 43535d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43545d13a37bSArne Jansen } 43555d13a37bSArne Jansen 4356f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43575d13a37bSArne Jansen 43583a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43595d13a37bSArne Jansen if (err && !ret) 43605d13a37bSArne Jansen ret = err; 43615d13a37bSArne Jansen 43625d13a37bSArne Jansen out: 43635d13a37bSArne Jansen kfree(sa); 4364905b0ddaSMiao Xie drop_write: 4365905b0ddaSMiao Xie mnt_drop_write_file(file); 43665d13a37bSArne Jansen return ret; 43675d13a37bSArne Jansen } 43685d13a37bSArne Jansen 43692f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43702f232036SJan Schmidt { 43710b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43732f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43742f232036SJan Schmidt int ret; 43752f232036SJan Schmidt 43762f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43772f232036SJan Schmidt return -EPERM; 43782f232036SJan Schmidt 43792f232036SJan Schmidt ret = mnt_want_write_file(file); 43802f232036SJan Schmidt if (ret) 43812f232036SJan Schmidt return ret; 43822f232036SJan Schmidt 43832f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43842f232036SJan Schmidt if (IS_ERR(qsa)) { 43852f232036SJan Schmidt ret = PTR_ERR(qsa); 43862f232036SJan Schmidt goto drop_write; 43872f232036SJan Schmidt } 43882f232036SJan Schmidt 43892f232036SJan Schmidt if (qsa->flags) { 43902f232036SJan Schmidt ret = -EINVAL; 43912f232036SJan Schmidt goto out; 43922f232036SJan Schmidt } 43932f232036SJan Schmidt 43940b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 43952f232036SJan Schmidt 43962f232036SJan Schmidt out: 43972f232036SJan Schmidt kfree(qsa); 43982f232036SJan Schmidt drop_write: 43992f232036SJan Schmidt mnt_drop_write_file(file); 44002f232036SJan Schmidt return ret; 44012f232036SJan Schmidt } 44022f232036SJan Schmidt 4403b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4404b929c1d8SMarcos Paulo de Souza void __user *arg) 44052f232036SJan Schmidt { 44062f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44072f232036SJan Schmidt int ret = 0; 44082f232036SJan Schmidt 44092f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44102f232036SJan Schmidt return -EPERM; 44112f232036SJan Schmidt 44128d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44132f232036SJan Schmidt if (!qsa) 44142f232036SJan Schmidt return -ENOMEM; 44152f232036SJan Schmidt 44160b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44172f232036SJan Schmidt qsa->flags = 1; 44180b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44192f232036SJan Schmidt } 44202f232036SJan Schmidt 44212f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44222f232036SJan Schmidt ret = -EFAULT; 44232f232036SJan Schmidt 44242f232036SJan Schmidt kfree(qsa); 44252f232036SJan Schmidt return ret; 44262f232036SJan Schmidt } 44272f232036SJan Schmidt 4428b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4429b929c1d8SMarcos Paulo de Souza void __user *arg) 443057254b6eSJan Schmidt { 443157254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 443257254b6eSJan Schmidt return -EPERM; 443357254b6eSJan Schmidt 44340b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 443557254b6eSJan Schmidt } 443657254b6eSJan Schmidt 4437abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4438abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44398ea05e3aSAlexander Block { 4440496ad9aaSAl Viro struct inode *inode = file_inode(file); 44410b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44428ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44438ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44448ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 444595582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44468ea05e3aSAlexander Block int ret = 0; 4447dd5f9615SStefan Behrens int received_uuid_changed; 44488ea05e3aSAlexander Block 4449bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4450bd60ea0fSDavid Sterba return -EPERM; 4451bd60ea0fSDavid Sterba 44528ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44538ea05e3aSAlexander Block if (ret < 0) 44548ea05e3aSAlexander Block return ret; 44558ea05e3aSAlexander Block 44560b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44578ea05e3aSAlexander Block 44584a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44598ea05e3aSAlexander Block ret = -EINVAL; 44608ea05e3aSAlexander Block goto out; 44618ea05e3aSAlexander Block } 44628ea05e3aSAlexander Block 44638ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44648ea05e3aSAlexander Block ret = -EROFS; 44658ea05e3aSAlexander Block goto out; 44668ea05e3aSAlexander Block } 44678ea05e3aSAlexander Block 4468dd5f9615SStefan Behrens /* 4469dd5f9615SStefan Behrens * 1 - root item 4470dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4471dd5f9615SStefan Behrens */ 4472dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44738ea05e3aSAlexander Block if (IS_ERR(trans)) { 44748ea05e3aSAlexander Block ret = PTR_ERR(trans); 44758ea05e3aSAlexander Block trans = NULL; 44768ea05e3aSAlexander Block goto out; 44778ea05e3aSAlexander Block } 44788ea05e3aSAlexander Block 44798ea05e3aSAlexander Block sa->rtransid = trans->transid; 44808ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44818ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44828ea05e3aSAlexander Block 4483dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4484dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4485dd5f9615SStefan Behrens if (received_uuid_changed && 4486d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4487d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4488dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4489dd5f9615SStefan Behrens root->root_key.objectid); 4490d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4491d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4492d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4493d87ff758SNikolay Borisov goto out; 4494d87ff758SNikolay Borisov } 4495d87ff758SNikolay Borisov } 44968ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 44978ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 44988ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 44993cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45003cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45013cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45023cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45038ea05e3aSAlexander Block 45040b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45058ea05e3aSAlexander Block &root->root_key, &root->root_item); 45068ea05e3aSAlexander Block if (ret < 0) { 45073a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45088ea05e3aSAlexander Block goto out; 4509dd5f9615SStefan Behrens } 4510dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4511cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4512dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4513dd5f9615SStefan Behrens root->root_key.objectid); 4514dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 451566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4516efd38150SNikolay Borisov btrfs_end_transaction(trans); 4517dd5f9615SStefan Behrens goto out; 4518dd5f9615SStefan Behrens } 4519dd5f9615SStefan Behrens } 45203a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4521abccd00fSHugo Mills out: 45220b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4523abccd00fSHugo Mills mnt_drop_write_file(file); 4524abccd00fSHugo Mills return ret; 4525abccd00fSHugo Mills } 4526abccd00fSHugo Mills 4527abccd00fSHugo Mills #ifdef CONFIG_64BIT 4528abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4529abccd00fSHugo Mills void __user *arg) 4530abccd00fSHugo Mills { 4531abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4532abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4533abccd00fSHugo Mills int ret = 0; 4534abccd00fSHugo Mills 4535abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45367b9ea627SShailendra Verma if (IS_ERR(args32)) 45377b9ea627SShailendra Verma return PTR_ERR(args32); 4538abccd00fSHugo Mills 45398d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 454084dbeb87SDan Carpenter if (!args64) { 454184dbeb87SDan Carpenter ret = -ENOMEM; 4542abccd00fSHugo Mills goto out; 4543abccd00fSHugo Mills } 4544abccd00fSHugo Mills 4545abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4546abccd00fSHugo Mills args64->stransid = args32->stransid; 4547abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4548abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4549abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4550abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4551abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4552abccd00fSHugo Mills args64->flags = args32->flags; 4553abccd00fSHugo Mills 4554abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4555abccd00fSHugo Mills if (ret) 4556abccd00fSHugo Mills goto out; 4557abccd00fSHugo Mills 4558abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4559abccd00fSHugo Mills args32->stransid = args64->stransid; 4560abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4561abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4562abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4563abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4564abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4565abccd00fSHugo Mills args32->flags = args64->flags; 4566abccd00fSHugo Mills 4567abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4568abccd00fSHugo Mills if (ret) 4569abccd00fSHugo Mills ret = -EFAULT; 4570abccd00fSHugo Mills 4571abccd00fSHugo Mills out: 4572abccd00fSHugo Mills kfree(args32); 4573abccd00fSHugo Mills kfree(args64); 4574abccd00fSHugo Mills return ret; 4575abccd00fSHugo Mills } 4576abccd00fSHugo Mills #endif 4577abccd00fSHugo Mills 4578abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4579abccd00fSHugo Mills void __user *arg) 4580abccd00fSHugo Mills { 4581abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4582abccd00fSHugo Mills int ret = 0; 4583abccd00fSHugo Mills 4584abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45857b9ea627SShailendra Verma if (IS_ERR(sa)) 45867b9ea627SShailendra Verma return PTR_ERR(sa); 4587abccd00fSHugo Mills 4588abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4589abccd00fSHugo Mills 4590abccd00fSHugo Mills if (ret) 4591abccd00fSHugo Mills goto out; 4592abccd00fSHugo Mills 45938ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 45948ea05e3aSAlexander Block if (ret) 45958ea05e3aSAlexander Block ret = -EFAULT; 45968ea05e3aSAlexander Block 45978ea05e3aSAlexander Block out: 45988ea05e3aSAlexander Block kfree(sa); 45998ea05e3aSAlexander Block return ret; 46008ea05e3aSAlexander Block } 46018ea05e3aSAlexander Block 4602b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4603b929c1d8SMarcos Paulo de Souza void __user *arg) 4604867ab667Sjeff.liu { 4605a1b83ac5SAnand Jain size_t len; 4606867ab667Sjeff.liu int ret; 4607a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4608a1b83ac5SAnand Jain 46090b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46100b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46110b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4612a1b83ac5SAnand Jain 4613a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4614867ab667Sjeff.liu 4615867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46160b246afaSJeff Mahoney btrfs_warn(fs_info, 46170b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46180b246afaSJeff Mahoney --len); 4619867ab667Sjeff.liu } 4620867ab667Sjeff.liu 4621867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4622867ab667Sjeff.liu 4623867ab667Sjeff.liu return ret ? -EFAULT : 0; 4624867ab667Sjeff.liu } 4625867ab667Sjeff.liu 4626a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4627a8bfd4abSjeff.liu { 46280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46300b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46310b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4632a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4633a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4634a8bfd4abSjeff.liu int ret; 4635a8bfd4abSjeff.liu 4636a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4637a8bfd4abSjeff.liu return -EPERM; 4638a8bfd4abSjeff.liu 4639a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4640a8bfd4abSjeff.liu return -EFAULT; 4641a8bfd4abSjeff.liu 4642a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46430b246afaSJeff Mahoney btrfs_err(fs_info, 46445d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4645a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4646a8bfd4abSjeff.liu return -EINVAL; 4647a8bfd4abSjeff.liu } 4648a8bfd4abSjeff.liu 4649a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4650a8bfd4abSjeff.liu if (ret) 4651a8bfd4abSjeff.liu return ret; 4652a8bfd4abSjeff.liu 4653a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4654a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4655a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4656a8bfd4abSjeff.liu goto out_unlock; 4657a8bfd4abSjeff.liu } 4658a8bfd4abSjeff.liu 46590b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4660a8bfd4abSjeff.liu strcpy(super_block->label, label); 46610b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46623a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4663a8bfd4abSjeff.liu 4664a8bfd4abSjeff.liu out_unlock: 4665a8bfd4abSjeff.liu mnt_drop_write_file(file); 4666a8bfd4abSjeff.liu return ret; 4667a8bfd4abSjeff.liu } 4668a8bfd4abSjeff.liu 46692eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46702eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46712eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46722eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46732eaa055fSJeff Mahoney 4674d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46752eaa055fSJeff Mahoney { 46764d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46772eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46782eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46792eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46802eaa055fSJeff Mahoney }; 46812eaa055fSJeff Mahoney 46822eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46832eaa055fSJeff Mahoney return -EFAULT; 46842eaa055fSJeff Mahoney 46852eaa055fSJeff Mahoney return 0; 46862eaa055fSJeff Mahoney } 46872eaa055fSJeff Mahoney 4688b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4689b929c1d8SMarcos Paulo de Souza void __user *arg) 46902eaa055fSJeff Mahoney { 46910b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46922eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46932eaa055fSJeff Mahoney 46942eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 46952eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 46962eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 46972eaa055fSJeff Mahoney 46982eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46992eaa055fSJeff Mahoney return -EFAULT; 47002eaa055fSJeff Mahoney 47012eaa055fSJeff Mahoney return 0; 47022eaa055fSJeff Mahoney } 47032eaa055fSJeff Mahoney 47042ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47053b02a68aSJeff Mahoney enum btrfs_feature_set set, 47062eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47072eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47082eaa055fSJeff Mahoney { 4709f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47103b02a68aSJeff Mahoney char *names; 47112eaa055fSJeff Mahoney u64 disallowed, unsupported; 47122eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47132eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47142eaa055fSJeff Mahoney 47152eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47162eaa055fSJeff Mahoney if (unsupported) { 47173b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47183b02a68aSJeff Mahoney if (names) { 47190b246afaSJeff Mahoney btrfs_warn(fs_info, 47203b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47213b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47223b02a68aSJeff Mahoney kfree(names); 47233b02a68aSJeff Mahoney } else 47240b246afaSJeff Mahoney btrfs_warn(fs_info, 47252eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47262eaa055fSJeff Mahoney type, unsupported); 47272eaa055fSJeff Mahoney return -EOPNOTSUPP; 47282eaa055fSJeff Mahoney } 47292eaa055fSJeff Mahoney 47302eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47312eaa055fSJeff Mahoney if (disallowed) { 47323b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47333b02a68aSJeff Mahoney if (names) { 47340b246afaSJeff Mahoney btrfs_warn(fs_info, 47353b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47363b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47373b02a68aSJeff Mahoney kfree(names); 47383b02a68aSJeff Mahoney } else 47390b246afaSJeff Mahoney btrfs_warn(fs_info, 47402eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47412eaa055fSJeff Mahoney type, disallowed); 47422eaa055fSJeff Mahoney return -EPERM; 47432eaa055fSJeff Mahoney } 47442eaa055fSJeff Mahoney 47452eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47462eaa055fSJeff Mahoney if (disallowed) { 47473b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47483b02a68aSJeff Mahoney if (names) { 47490b246afaSJeff Mahoney btrfs_warn(fs_info, 47503b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47513b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47523b02a68aSJeff Mahoney kfree(names); 47533b02a68aSJeff Mahoney } else 47540b246afaSJeff Mahoney btrfs_warn(fs_info, 47552eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47562eaa055fSJeff Mahoney type, disallowed); 47572eaa055fSJeff Mahoney return -EPERM; 47582eaa055fSJeff Mahoney } 47592eaa055fSJeff Mahoney 47602eaa055fSJeff Mahoney return 0; 47612eaa055fSJeff Mahoney } 47622eaa055fSJeff Mahoney 47632ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47642ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47652eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47662eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47672eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47682eaa055fSJeff Mahoney 47692eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47702eaa055fSJeff Mahoney { 47710b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47730b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47740b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47752eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47762eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47772eaa055fSJeff Mahoney u64 newflags; 47782eaa055fSJeff Mahoney int ret; 47792eaa055fSJeff Mahoney 47802eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47812eaa055fSJeff Mahoney return -EPERM; 47822eaa055fSJeff Mahoney 47832eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47842eaa055fSJeff Mahoney return -EFAULT; 47852eaa055fSJeff Mahoney 47862eaa055fSJeff Mahoney /* Nothing to do */ 47872eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47882eaa055fSJeff Mahoney !flags[0].incompat_flags) 47892eaa055fSJeff Mahoney return 0; 47902eaa055fSJeff Mahoney 47912ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47922eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47932eaa055fSJeff Mahoney if (ret) 47942eaa055fSJeff Mahoney return ret; 47952eaa055fSJeff Mahoney 47962ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 47972eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 47982eaa055fSJeff Mahoney if (ret) 47992eaa055fSJeff Mahoney return ret; 48002eaa055fSJeff Mahoney 48012ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48022eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48032eaa055fSJeff Mahoney if (ret) 48042eaa055fSJeff Mahoney return ret; 48052eaa055fSJeff Mahoney 48067ab19625SDavid Sterba ret = mnt_want_write_file(file); 48077ab19625SDavid Sterba if (ret) 48087ab19625SDavid Sterba return ret; 48097ab19625SDavid Sterba 48108051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48117ab19625SDavid Sterba if (IS_ERR(trans)) { 48127ab19625SDavid Sterba ret = PTR_ERR(trans); 48137ab19625SDavid Sterba goto out_drop_write; 48147ab19625SDavid Sterba } 48152eaa055fSJeff Mahoney 48160b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48172eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48182eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48192eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48202eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48212eaa055fSJeff Mahoney 48222eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48232eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48242eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48252eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48262eaa055fSJeff Mahoney 48272eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48282eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48292eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48302eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48310b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48322eaa055fSJeff Mahoney 48333a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48347ab19625SDavid Sterba out_drop_write: 48357ab19625SDavid Sterba mnt_drop_write_file(file); 48367ab19625SDavid Sterba 48377ab19625SDavid Sterba return ret; 48382eaa055fSJeff Mahoney } 48392eaa055fSJeff Mahoney 48402351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48412351f431SJosef Bacik { 48422351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48432351f431SJosef Bacik int ret; 48442351f431SJosef Bacik 48452351f431SJosef Bacik if (compat) { 48462351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48472351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48482351f431SJosef Bacik 48492351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48502351f431SJosef Bacik if (ret) 48512351f431SJosef Bacik return -EFAULT; 48522351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48532351f431SJosef Bacik if (!arg) 48542351f431SJosef Bacik return -ENOMEM; 48552351f431SJosef Bacik arg->send_fd = args32.send_fd; 48562351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48572351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48582351f431SJosef Bacik arg->parent_root = args32.parent_root; 48592351f431SJosef Bacik arg->flags = args32.flags; 48602351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48612351f431SJosef Bacik sizeof(args32.reserved)); 48622351f431SJosef Bacik #else 48632351f431SJosef Bacik return -ENOTTY; 48642351f431SJosef Bacik #endif 48652351f431SJosef Bacik } else { 48662351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48672351f431SJosef Bacik if (IS_ERR(arg)) 48682351f431SJosef Bacik return PTR_ERR(arg); 48692351f431SJosef Bacik } 48702351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48712351f431SJosef Bacik kfree(arg); 48722351f431SJosef Bacik return ret; 48732351f431SJosef Bacik } 48742351f431SJosef Bacik 4875f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4876f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4877f46b5a66SChristoph Hellwig { 48780b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48800b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48814bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4882f46b5a66SChristoph Hellwig 4883f46b5a66SChristoph Hellwig switch (cmd) { 48846cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48856cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48866cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48876cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48886cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48896cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 489040cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4891b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 489240cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 489340cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4894f7039b1dSLi Dongyang case FITRIM: 4895b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4896f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4897fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4898fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4899fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49003de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4901fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49026f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49036f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 490476dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4905949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4906949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4907949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49080caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49090caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49100caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49110caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49126ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49136ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4914f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49151e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49161e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49171e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4918f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4919198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4920f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49212ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4922f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4923da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49246b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49256b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4926475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49272ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4928475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49292ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4930f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49319ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4932ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4933ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4934cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4935cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4936ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4937ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4938d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4939d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4940d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4941d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4942d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4943d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49441406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49452ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49469b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49479b199859SFilipe David Borba Manana int ret; 49489b199859SFilipe David Borba Manana 49493d45f221SFilipe Manana ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false); 49509b199859SFilipe David Borba Manana if (ret) 49519b199859SFilipe David Borba Manana return ret; 49520b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49532fad4e83SDavid Sterba /* 49542fad4e83SDavid Sterba * The transaction thread may want to do more work, 495501327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49562fad4e83SDavid Sterba * processing uncleaned subvols. 49572fad4e83SDavid Sterba */ 49580b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49599b199859SFilipe David Borba Manana return ret; 49609b199859SFilipe David Borba Manana } 496146204592SSage Weil case BTRFS_IOC_START_SYNC: 49629a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 496346204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49642ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4965475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4966b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4967475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49682ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4969475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49702ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4971c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49729ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4973837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49742ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 497519a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49762ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49778ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49788ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4979abccd00fSHugo Mills #ifdef CONFIG_64BIT 4980abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4981abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4982abccd00fSHugo Mills #endif 498331db9f7cSAlexander Block case BTRFS_IOC_SEND: 49842351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49852351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49862351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49872351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49882351f431SJosef Bacik #endif 4989c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49902ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49915d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4992905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49935d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 4994905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 49955d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 4996905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 49975d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 4998905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 49992f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50002f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50012f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5002b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 500357254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5004b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50053f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50062ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50072eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5008d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50092eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5010b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50112eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50122eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5013e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5014e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5015025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5016025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5017b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5018b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 501942e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 502042e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 502123d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 502223d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5023f46b5a66SChristoph Hellwig } 5024f46b5a66SChristoph Hellwig 5025f46b5a66SChristoph Hellwig return -ENOTTY; 5026f46b5a66SChristoph Hellwig } 50274c63c245SLuke Dashjr 50284c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50294c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50304c63c245SLuke Dashjr { 50312a362249SJeff Mahoney /* 50322a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50332a362249SJeff Mahoney * handling is necessary. 50342a362249SJeff Mahoney */ 50354c63c245SLuke Dashjr switch (cmd) { 50364c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 50374c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 50384c63c245SLuke Dashjr break; 50394c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 50404c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 50414c63c245SLuke Dashjr break; 50424c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50434c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50444c63c245SLuke Dashjr break; 50454c63c245SLuke Dashjr } 50464c63c245SLuke Dashjr 50474c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50484c63c245SLuke Dashjr } 50494c63c245SLuke Dashjr #endif 5050