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 /* 5311cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 5321cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 5331cb3dc3fSNaohiro Aota * filesystem for now. 5341cb3dc3fSNaohiro Aota */ 5351cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 5361cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 5371cb3dc3fSNaohiro Aota 5381cb3dc3fSNaohiro Aota /* 539f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 540f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 541f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 542f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 543f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 544f35f06c3SFilipe Manana */ 545f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 546f35f06c3SFilipe Manana return -EROFS; 547f35f06c3SFilipe Manana 5481f78160cSXiao Guangrong rcu_read_lock(); 5491f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5501f78160cSXiao Guangrong dev_list) { 551f7039b1dSLi Dongyang if (!device->bdev) 552f7039b1dSLi Dongyang continue; 553f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 554f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 555f7039b1dSLi Dongyang num_devices++; 55650d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 557f7039b1dSLi Dongyang minlen); 558f7039b1dSLi Dongyang } 559f7039b1dSLi Dongyang } 5601f78160cSXiao Guangrong rcu_read_unlock(); 561f4c697e6SLukas Czerner 562f7039b1dSLi Dongyang if (!num_devices) 563f7039b1dSLi Dongyang return -EOPNOTSUPP; 564f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 565f7039b1dSLi Dongyang return -EFAULT; 5666ba9fc8eSQu Wenruo 5676ba9fc8eSQu Wenruo /* 5686ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5696ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5706ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5716ba9fc8eSQu Wenruo */ 5726ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 573f4c697e6SLukas Czerner return -EINVAL; 574f7039b1dSLi Dongyang 575f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5762ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 577f7039b1dSLi Dongyang if (ret < 0) 578f7039b1dSLi Dongyang return ret; 579f7039b1dSLi Dongyang 580f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 581f7039b1dSLi Dongyang return -EFAULT; 582f7039b1dSLi Dongyang 583f7039b1dSLi Dongyang return 0; 584f7039b1dSLi Dongyang } 585f7039b1dSLi Dongyang 586e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 587dd5f9615SStefan Behrens { 58846e0f66aSChris Mason int i; 58946e0f66aSChris Mason 59046e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 59146e0f66aSChris Mason if (uuid[i]) 59246e0f66aSChris Mason return 0; 59346e0f66aSChris Mason } 59446e0f66aSChris Mason return 1; 595dd5f9615SStefan Behrens } 596dd5f9615SStefan Behrens 597d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 598cb8e7090SChristoph Hellwig struct dentry *dentry, 59952f75f4fSDavid Sterba const char *name, int namelen, 6008696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 601f46b5a66SChristoph Hellwig { 6020b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 603f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 604f46b5a66SChristoph Hellwig struct btrfs_key key; 60549a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 606f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 607f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 608d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 60976dda93cSYan, Zheng struct btrfs_root *new_root; 610d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 61195582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 6125662344bSTsutomu Itoh struct inode *inode; 613f46b5a66SChristoph Hellwig int ret; 614f46b5a66SChristoph Hellwig int err; 6152dfb1e43SQu Wenruo dev_t anon_dev = 0; 616f46b5a66SChristoph Hellwig u64 objectid; 6173de4586cSChris Mason u64 index = 0; 618f46b5a66SChristoph Hellwig 61949a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 62049a3c4d9SDavid Sterba if (!root_item) 62149a3c4d9SDavid Sterba return -ENOMEM; 62249a3c4d9SDavid Sterba 623543068a2SNikolay Borisov ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); 6242fbe8c8aSAl Viro if (ret) 62549a3c4d9SDavid Sterba goto fail_free; 6266a912213SJosef Bacik 6272dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 6282dfb1e43SQu Wenruo if (ret < 0) 6292dfb1e43SQu Wenruo goto fail_free; 6302dfb1e43SQu Wenruo 631e09fe2d2SQu Wenruo /* 632e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 63301327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 634e09fe2d2SQu Wenruo */ 63549a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 63649a3c4d9SDavid Sterba ret = -ENOSPC; 63749a3c4d9SDavid Sterba goto fail_free; 63849a3c4d9SDavid Sterba } 639e09fe2d2SQu Wenruo 640d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6419ed74f2dSJosef Bacik /* 642d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 643d5c12070SMiao Xie * of create_snapshot(). 6449ed74f2dSJosef Bacik */ 645c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 646d5c12070SMiao Xie if (ret) 64749a3c4d9SDavid Sterba goto fail_free; 648f46b5a66SChristoph Hellwig 649d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 650d5c12070SMiao Xie if (IS_ERR(trans)) { 651d5c12070SMiao Xie ret = PTR_ERR(trans); 652e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 65349a3c4d9SDavid Sterba goto fail_free; 654d5c12070SMiao Xie } 655d5c12070SMiao Xie trans->block_rsv = &block_rsv; 656d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 657f46b5a66SChristoph Hellwig 658a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6596f72c7e2SArne Jansen if (ret) 6606f72c7e2SArne Jansen goto fail; 6616f72c7e2SArne Jansen 6629631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6639631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6648e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6658e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6668e8a1e31SJosef Bacik goto fail; 6678e8a1e31SJosef Bacik } 668f46b5a66SChristoph Hellwig 669f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 670f46b5a66SChristoph Hellwig 67149a3c4d9SDavid Sterba inode_item = &root_item->inode; 6723cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6733cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6743cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 675da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6760b246afaSJeff Mahoney fs_info->nodesize); 6773cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 678f46b5a66SChristoph Hellwig 67949a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 68049a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6813cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 68208fe4db1SLi Zefan 68349a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 68449a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 68549a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 68649a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 68749a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68849a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 689f46b5a66SChristoph Hellwig 69049a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 69149a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 692807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 69349a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 69449a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 69549a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 69649a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 69749a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 698f46b5a66SChristoph Hellwig 699925baeddSChris Mason btrfs_tree_unlock(leaf); 700f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 701f46b5a66SChristoph Hellwig leaf = NULL; 702f46b5a66SChristoph Hellwig 70369948022SNikolay Borisov btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); 704f46b5a66SChristoph Hellwig 705f46b5a66SChristoph Hellwig key.objectid = objectid; 7065d4f98a2SYan Zheng key.offset = 0; 707962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7080b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70949a3c4d9SDavid Sterba root_item); 710f46b5a66SChristoph Hellwig if (ret) 711f46b5a66SChristoph Hellwig goto fail; 712f46b5a66SChristoph Hellwig 71376dda93cSYan, Zheng key.offset = (u64)-1; 7142dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 71579787eaaSJeff Mahoney if (IS_ERR(new_root)) { 7162dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 71779787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 71979787eaaSJeff Mahoney goto fail; 72079787eaaSJeff Mahoney } 7212dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 7222dfb1e43SQu Wenruo anon_dev = 0; 72376dda93cSYan, Zheng 72476dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 72576dda93cSYan, Zheng 72669948022SNikolay Borisov ret = btrfs_create_subvol_root(trans, new_root, root); 72700246528SJosef Bacik btrfs_put_root(new_root); 728ce598979SMark Fasheh if (ret) { 729ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 73066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 731ce598979SMark Fasheh goto fail; 732ce598979SMark Fasheh } 733ce598979SMark Fasheh 734f46b5a66SChristoph Hellwig /* 735f46b5a66SChristoph Hellwig * insert the directory item 736f46b5a66SChristoph Hellwig */ 737877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 73879787eaaSJeff Mahoney if (ret) { 73966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 74079787eaaSJeff Mahoney goto fail; 74179787eaaSJeff Mahoney } 7423de4586cSChris Mason 743684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7443de4586cSChris Mason BTRFS_FT_DIR, index); 74579787eaaSJeff Mahoney if (ret) { 74666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 747f46b5a66SChristoph Hellwig goto fail; 74879787eaaSJeff Mahoney } 7490660b5afSChris Mason 7506ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7519a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 752c7e54b51SJosef Bacik if (ret) { 753c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 754c7e54b51SJosef Bacik goto fail; 755c7e54b51SJosef Bacik } 75652c26179SYan Zheng 7576025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7584a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 759c7e54b51SJosef Bacik if (ret) { 760c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 761c7e54b51SJosef Bacik goto fail; 762c7e54b51SJosef Bacik } 7630660b5afSChris Mason 764cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7656bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 766dd5f9615SStefan Behrens if (ret) 76766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 768dd5f9615SStefan Behrens 769f46b5a66SChristoph Hellwig fail: 77049a3c4d9SDavid Sterba kfree(root_item); 771d5c12070SMiao Xie trans->block_rsv = NULL; 772d5c12070SMiao Xie trans->bytes_reserved = 0; 773e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 774de6e8200SLiu Bo 7753a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 776f46b5a66SChristoph Hellwig if (err && !ret) 777f46b5a66SChristoph Hellwig ret = err; 7781a65e24bSChris Mason 7795662344bSTsutomu Itoh if (!ret) { 7805662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 781de6e8200SLiu Bo if (IS_ERR(inode)) 782de6e8200SLiu Bo return PTR_ERR(inode); 7835662344bSTsutomu Itoh d_instantiate(dentry, inode); 7845662344bSTsutomu Itoh } 785f46b5a66SChristoph Hellwig return ret; 78649a3c4d9SDavid Sterba 78749a3c4d9SDavid Sterba fail_free: 7882dfb1e43SQu Wenruo if (anon_dev) 7892dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 79049a3c4d9SDavid Sterba kfree(root_item); 79149a3c4d9SDavid Sterba return ret; 792f46b5a66SChristoph Hellwig } 793f46b5a66SChristoph Hellwig 794e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7959babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 796e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 797f46b5a66SChristoph Hellwig { 7980b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7992e4bfab9SYan, Zheng struct inode *inode; 800f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 801f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 8022e4bfab9SYan, Zheng int ret; 803f46b5a66SChristoph Hellwig 80492a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 805f46b5a66SChristoph Hellwig return -EINVAL; 806f46b5a66SChristoph Hellwig 807eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 808eede2bf3SOmar Sandoval btrfs_warn(fs_info, 809eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 810eede2bf3SOmar Sandoval return -ETXTBSY; 811eede2bf3SOmar Sandoval } 812eede2bf3SOmar Sandoval 81323269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 814a1ee7362SDavid Sterba if (!pending_snapshot) 815a1ee7362SDavid Sterba return -ENOMEM; 816a1ee7362SDavid Sterba 8172dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8182dfb1e43SQu Wenruo if (ret < 0) 8192dfb1e43SQu Wenruo goto free_pending; 820b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 82123269bf5SDavid Sterba GFP_KERNEL); 8228546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8238546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 824b0c0ea63SDavid Sterba ret = -ENOMEM; 825b0c0ea63SDavid Sterba goto free_pending; 826b0c0ea63SDavid Sterba } 827b0c0ea63SDavid Sterba 82866d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 82966d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 830d5c12070SMiao Xie /* 831d5c12070SMiao Xie * 1 - parent dir inode 832d5c12070SMiao Xie * 2 - dir entries 833d5c12070SMiao Xie * 1 - root item 834d5c12070SMiao Xie * 2 - root ref/backref 835d5c12070SMiao Xie * 1 - root of snapshot 836dd5f9615SStefan Behrens * 1 - UUID item 837d5c12070SMiao Xie */ 838d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 839dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 840ee3441b4SJeff Mahoney false); 841d5c12070SMiao Xie if (ret) 842c11fbb6eSRobbie Ko goto free_pending; 843d5c12070SMiao Xie 844a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 845a22285a6SYan, Zheng pending_snapshot->root = root; 846b83cc969SLi Zefan pending_snapshot->readonly = readonly; 847e9662f70SMiao Xie pending_snapshot->dir = dir; 8488696c533SMiao Xie pending_snapshot->inherit = inherit; 849a22285a6SYan, Zheng 850d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 851a22285a6SYan, Zheng if (IS_ERR(trans)) { 852a22285a6SYan, Zheng ret = PTR_ERR(trans); 853a22285a6SYan, Zheng goto fail; 854a22285a6SYan, Zheng } 855a22285a6SYan, Zheng 8560b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 857a22285a6SYan, Zheng list_add(&pending_snapshot->list, 858a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8590b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8609babda9fSNikolay Borisov 8613a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 862aec8030aSMiao Xie if (ret) 863c37b2b62SJosef Bacik goto fail; 864a22285a6SYan, Zheng 865a22285a6SYan, Zheng ret = pending_snapshot->error; 866f46b5a66SChristoph Hellwig if (ret) 8672e4bfab9SYan, Zheng goto fail; 868f46b5a66SChristoph Hellwig 869d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 870d3797308SChris Mason if (ret) 871d3797308SChris Mason goto fail; 872d3797308SChris Mason 8732b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8742e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8752e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8762e4bfab9SYan, Zheng goto fail; 8772e4bfab9SYan, Zheng } 8785662344bSTsutomu Itoh 8792e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8802e4bfab9SYan, Zheng ret = 0; 8812dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8822e4bfab9SYan, Zheng fail: 8832dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8842dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8852dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 88600246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 887e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 888b0c0ea63SDavid Sterba free_pending: 8892dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8902dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 891b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8928546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 893a1ee7362SDavid Sterba kfree(pending_snapshot); 894a1ee7362SDavid Sterba 895f46b5a66SChristoph Hellwig return ret; 896f46b5a66SChristoph Hellwig } 897f46b5a66SChristoph Hellwig 8984260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8994260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 9004260f7c7SSage Weil * whether the type of victim is right. 9014260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 9024260f7c7SSage Weil * 2. We should have write and exec permissions on dir 9034260f7c7SSage Weil * 3. We can't remove anything from append-only dir 9044260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 9054260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 9064260f7c7SSage Weil * a. be owner of dir, or 9074260f7c7SSage Weil * b. be owner of victim, or 9084260f7c7SSage Weil * c. have CAP_FOWNER capability 90901327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 9104260f7c7SSage Weil * links pointing to it. 9114260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 9124260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 9134260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 9144260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9154260f7c7SSage Weil * nfs_async_unlink(). 9164260f7c7SSage Weil */ 9174260f7c7SSage Weil 9184260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9194260f7c7SSage Weil { 9204260f7c7SSage Weil int error; 9214260f7c7SSage Weil 9222b0143b5SDavid Howells if (d_really_is_negative(victim)) 9234260f7c7SSage Weil return -ENOENT; 9244260f7c7SSage Weil 9252b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9264fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9274260f7c7SSage Weil 9284260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9294260f7c7SSage Weil if (error) 9304260f7c7SSage Weil return error; 9314260f7c7SSage Weil if (IS_APPEND(dir)) 9324260f7c7SSage Weil return -EPERM; 9332b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9342b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9354260f7c7SSage Weil return -EPERM; 9364260f7c7SSage Weil if (isdir) { 937e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9384260f7c7SSage Weil return -ENOTDIR; 9394260f7c7SSage Weil if (IS_ROOT(victim)) 9404260f7c7SSage Weil return -EBUSY; 941e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9424260f7c7SSage Weil return -EISDIR; 9434260f7c7SSage Weil if (IS_DEADDIR(dir)) 9444260f7c7SSage Weil return -ENOENT; 9454260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9464260f7c7SSage Weil return -EBUSY; 9474260f7c7SSage Weil return 0; 9484260f7c7SSage Weil } 9494260f7c7SSage Weil 950cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 951cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 952cb8e7090SChristoph Hellwig { 9532b0143b5SDavid Howells if (d_really_is_positive(child)) 954cb8e7090SChristoph Hellwig return -EEXIST; 955cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 956cb8e7090SChristoph Hellwig return -ENOENT; 957cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 958cb8e7090SChristoph Hellwig } 959cb8e7090SChristoph Hellwig 960cb8e7090SChristoph Hellwig /* 961cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 962cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 963cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 964cb8e7090SChristoph Hellwig */ 96592872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 96652f75f4fSDavid Sterba const char *name, int namelen, 96772fd032eSSage Weil struct btrfs_root *snap_src, 9689babda9fSNikolay Borisov bool readonly, 9698696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 970cb8e7090SChristoph Hellwig { 9712b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 973cb8e7090SChristoph Hellwig struct dentry *dentry; 974cb8e7090SChristoph Hellwig int error; 975cb8e7090SChristoph Hellwig 97600235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 97700235411SAl Viro if (error == -EINTR) 97800235411SAl Viro return error; 979cb8e7090SChristoph Hellwig 980cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 981cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 982cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 983cb8e7090SChristoph Hellwig goto out_unlock; 984cb8e7090SChristoph Hellwig 98576dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 986cb8e7090SChristoph Hellwig if (error) 987a874a63eSLiu Bo goto out_dput; 988cb8e7090SChristoph Hellwig 9899c52057cSChris Mason /* 9909c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9919c52057cSChris Mason * check for them now when we can safely fail 9929c52057cSChris Mason */ 9939c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9949c52057cSChris Mason dir->i_ino, name, 9959c52057cSChris Mason namelen); 9969c52057cSChris Mason if (error) 9979c52057cSChris Mason goto out_dput; 9989c52057cSChris Mason 9990b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 100076dda93cSYan, Zheng 100176dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 100276dda93cSYan, Zheng goto out_up_read; 100376dda93cSYan, Zheng 10049babda9fSNikolay Borisov if (snap_src) 10059babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 10069babda9fSNikolay Borisov else 10079babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 10089babda9fSNikolay Borisov 100976dda93cSYan, Zheng if (!error) 101076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 101176dda93cSYan, Zheng out_up_read: 10120b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1013cb8e7090SChristoph Hellwig out_dput: 1014cb8e7090SChristoph Hellwig dput(dentry); 1015cb8e7090SChristoph Hellwig out_unlock: 10165955102cSAl Viro inode_unlock(dir); 1017cb8e7090SChristoph Hellwig return error; 1018cb8e7090SChristoph Hellwig } 1019cb8e7090SChristoph Hellwig 1020c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1021c11fbb6eSRobbie Ko const char *name, int namelen, 1022c11fbb6eSRobbie Ko struct btrfs_root *root, 1023c11fbb6eSRobbie Ko bool readonly, 1024c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1025c11fbb6eSRobbie Ko { 1026c11fbb6eSRobbie Ko int ret; 1027c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1028c11fbb6eSRobbie Ko 1029c11fbb6eSRobbie Ko /* 1030c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1031c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1032c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1033c11fbb6eSRobbie Ko */ 1034c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1035c11fbb6eSRobbie Ko 1036c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1037c11fbb6eSRobbie Ko if (ret) 1038c11fbb6eSRobbie Ko goto out; 1039c11fbb6eSRobbie Ko 1040c11fbb6eSRobbie Ko /* 1041c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1042c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1043c11fbb6eSRobbie Ko * creation. 1044c11fbb6eSRobbie Ko */ 1045c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1046c11fbb6eSRobbie Ko snapshot_force_cow = true; 1047c11fbb6eSRobbie Ko 1048c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1049c11fbb6eSRobbie Ko 1050c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1051c11fbb6eSRobbie Ko root, readonly, inherit); 1052c11fbb6eSRobbie Ko out: 1053c11fbb6eSRobbie Ko if (snapshot_force_cow) 1054c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1055c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1056c11fbb6eSRobbie Ko return ret; 1057c11fbb6eSRobbie Ko } 1058c11fbb6eSRobbie Ko 10594cb5300bSChris Mason /* 10604cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10614cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10624cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10634cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10644cb5300bSChris Mason * part of the file 10654cb5300bSChris Mason */ 1066aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10674cb5300bSChris Mason { 10684cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10694cb5300bSChris Mason struct extent_map *em = NULL; 10704cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10714cb5300bSChris Mason u64 end; 10724cb5300bSChris Mason 10734cb5300bSChris Mason read_lock(&em_tree->lock); 107409cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10754cb5300bSChris Mason read_unlock(&em_tree->lock); 10764cb5300bSChris Mason 10774cb5300bSChris Mason if (em) { 10784cb5300bSChris Mason end = extent_map_end(em); 10794cb5300bSChris Mason free_extent_map(em); 10804cb5300bSChris Mason if (end - offset > thresh) 10814cb5300bSChris Mason return 0; 10824cb5300bSChris Mason } 10834cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10844cb5300bSChris Mason thresh /= 2; 10854cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10864cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10874cb5300bSChris Mason if (end >= thresh) 10884cb5300bSChris Mason return 0; 10894cb5300bSChris Mason return 1; 10904cb5300bSChris Mason } 10914cb5300bSChris Mason 10924cb5300bSChris Mason /* 10934cb5300bSChris Mason * helper function to walk through a file and find extents 10944cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10954cb5300bSChris Mason * 10964cb5300bSChris Mason * This is used by the defragging code to find new and small 10974cb5300bSChris Mason * extents 10984cb5300bSChris Mason */ 10994cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 11004cb5300bSChris Mason struct inode *inode, u64 newer_than, 1101aab110abSDavid Sterba u64 *off, u32 thresh) 11024cb5300bSChris Mason { 11034cb5300bSChris Mason struct btrfs_path *path; 11044cb5300bSChris Mason struct btrfs_key min_key; 11054cb5300bSChris Mason struct extent_buffer *leaf; 11064cb5300bSChris Mason struct btrfs_file_extent_item *extent; 11074cb5300bSChris Mason int type; 11084cb5300bSChris Mason int ret; 11094a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 11104cb5300bSChris Mason 11114cb5300bSChris Mason path = btrfs_alloc_path(); 11124cb5300bSChris Mason if (!path) 11134cb5300bSChris Mason return -ENOMEM; 11144cb5300bSChris Mason 1115a4689d2bSDavid Sterba min_key.objectid = ino; 11164cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 11174cb5300bSChris Mason min_key.offset = *off; 11184cb5300bSChris Mason 11194cb5300bSChris Mason while (1) { 11206174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 11214cb5300bSChris Mason if (ret != 0) 11224cb5300bSChris Mason goto none; 1123f094c9bdSFilipe Manana process_slot: 1124a4689d2bSDavid Sterba if (min_key.objectid != ino) 11254cb5300bSChris Mason goto none; 11264cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11274cb5300bSChris Mason goto none; 11284cb5300bSChris Mason 11294cb5300bSChris Mason leaf = path->nodes[0]; 11304cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11314cb5300bSChris Mason struct btrfs_file_extent_item); 11324cb5300bSChris Mason 11334cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11344cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11354cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11364cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11374cb5300bSChris Mason *off = min_key.offset; 11384cb5300bSChris Mason btrfs_free_path(path); 11394cb5300bSChris Mason return 0; 11404cb5300bSChris Mason } 11414cb5300bSChris Mason 1142f094c9bdSFilipe Manana path->slots[0]++; 1143f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1144f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1145f094c9bdSFilipe Manana goto process_slot; 1146f094c9bdSFilipe Manana } 1147f094c9bdSFilipe Manana 11484cb5300bSChris Mason if (min_key.offset == (u64)-1) 11494cb5300bSChris Mason goto none; 11504cb5300bSChris Mason 11514cb5300bSChris Mason min_key.offset++; 11524cb5300bSChris Mason btrfs_release_path(path); 11534cb5300bSChris Mason } 11544cb5300bSChris Mason none: 11554cb5300bSChris Mason btrfs_free_path(path); 11564cb5300bSChris Mason return -ENOENT; 11574cb5300bSChris Mason } 11584cb5300bSChris Mason 11596c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 116017ce6ef8SLiu Bo { 116117ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1162940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11636c282eb4SLi Zefan struct extent_map *em; 116409cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1165940100a4SChris Mason 1166940100a4SChris Mason /* 1167940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1168940100a4SChris Mason * the full extent lock 1169940100a4SChris Mason */ 1170940100a4SChris Mason read_lock(&em_tree->lock); 1171940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1172940100a4SChris Mason read_unlock(&em_tree->lock); 1173940100a4SChris Mason 1174940100a4SChris Mason if (!em) { 1175308d9800SFilipe Manana struct extent_state *cached = NULL; 1176308d9800SFilipe Manana u64 end = start + len - 1; 1177308d9800SFilipe Manana 1178940100a4SChris Mason /* get the big lock and read metadata off disk */ 1179ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 118039b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1181e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1182940100a4SChris Mason 11836cf8bfbfSDan Carpenter if (IS_ERR(em)) 11846c282eb4SLi Zefan return NULL; 1185940100a4SChris Mason } 1186940100a4SChris Mason 11876c282eb4SLi Zefan return em; 11886c282eb4SLi Zefan } 11896c282eb4SLi Zefan 11906c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11916c282eb4SLi Zefan { 11926c282eb4SLi Zefan struct extent_map *next; 11936c282eb4SLi Zefan bool ret = true; 11946c282eb4SLi Zefan 11956c282eb4SLi Zefan /* this is the last extent */ 11966c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11976c282eb4SLi Zefan return false; 11986c282eb4SLi Zefan 11996c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1200e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1201e9512d72SChris Mason ret = false; 1202e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1203ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 12046c282eb4SLi Zefan ret = false; 12056c282eb4SLi Zefan 12066c282eb4SLi Zefan free_extent_map(next); 12076c282eb4SLi Zefan return ret; 12086c282eb4SLi Zefan } 12096c282eb4SLi Zefan 1210aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1211a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1212a43a2111SAndrew Mahone int compress) 12136c282eb4SLi Zefan { 12146c282eb4SLi Zefan struct extent_map *em; 12156c282eb4SLi Zefan int ret = 1; 12166c282eb4SLi Zefan bool next_mergeable = true; 12174a3560c4SLiu Bo bool prev_mergeable = true; 12186c282eb4SLi Zefan 12196c282eb4SLi Zefan /* 12206c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 12216c282eb4SLi Zefan * defragging it 12226c282eb4SLi Zefan */ 12236c282eb4SLi Zefan if (start < *defrag_end) 12246c282eb4SLi Zefan return 1; 12256c282eb4SLi Zefan 12266c282eb4SLi Zefan *skip = 0; 12276c282eb4SLi Zefan 12286c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12296c282eb4SLi Zefan if (!em) 12306c282eb4SLi Zefan return 0; 12316c282eb4SLi Zefan 1232940100a4SChris Mason /* this will cover holes, and inline extents */ 123317ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1234940100a4SChris Mason ret = 0; 123517ce6ef8SLiu Bo goto out; 123617ce6ef8SLiu Bo } 123717ce6ef8SLiu Bo 12384a3560c4SLiu Bo if (!*defrag_end) 12394a3560c4SLiu Bo prev_mergeable = false; 12404a3560c4SLiu Bo 12416c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1242940100a4SChris Mason /* 12436c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12446c282eb4SLi Zefan * real extent, don't bother defragging it 1245940100a4SChris Mason */ 1246a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12474a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1248940100a4SChris Mason ret = 0; 124917ce6ef8SLiu Bo out: 1250940100a4SChris Mason /* 1251940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1252940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1253940100a4SChris Mason * so that the next tiny extent will force a defrag. 1254940100a4SChris Mason * 1255940100a4SChris Mason * The end result of this is that tiny extents before a single big 1256940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1257940100a4SChris Mason */ 1258940100a4SChris Mason if (ret) { 1259940100a4SChris Mason *defrag_end = extent_map_end(em); 1260940100a4SChris Mason } else { 1261940100a4SChris Mason *last_len = 0; 1262940100a4SChris Mason *skip = extent_map_end(em); 1263940100a4SChris Mason *defrag_end = 0; 1264940100a4SChris Mason } 1265940100a4SChris Mason 1266940100a4SChris Mason free_extent_map(em); 1267940100a4SChris Mason return ret; 1268940100a4SChris Mason } 1269940100a4SChris Mason 12704cb5300bSChris Mason /* 12714cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12724cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12734cb5300bSChris Mason * to COW and defrag. 12744cb5300bSChris Mason * 12754cb5300bSChris Mason * It also makes sure the delalloc code has enough 12764cb5300bSChris Mason * dirty data to avoid making new small extents as part 12774cb5300bSChris Mason * of the defrag 12784cb5300bSChris Mason * 12794cb5300bSChris Mason * It's a good idea to start RA on this range 12804cb5300bSChris Mason * before calling this. 12814cb5300bSChris Mason */ 12824cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12834cb5300bSChris Mason struct page **pages, 12844cb5300bSChris Mason unsigned long start_index, 1285c41570c9SJustin Maggard unsigned long num_pages) 1286f46b5a66SChristoph Hellwig { 12874cb5300bSChris Mason unsigned long file_end; 12884cb5300bSChris Mason u64 isize = i_size_read(inode); 1289f46b5a66SChristoph Hellwig u64 page_start; 1290f46b5a66SChristoph Hellwig u64 page_end; 12911f12bd06SLiu Bo u64 page_cnt; 1292a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 12937f458a38SFilipe Manana u64 search_start; 12944cb5300bSChris Mason int ret; 12954cb5300bSChris Mason int i; 12964cb5300bSChris Mason int i_done; 12974cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12984cb5300bSChris Mason struct extent_state *cached_state = NULL; 1299600a45e1SMiao Xie struct extent_io_tree *tree; 1300364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 13013b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 13024cb5300bSChris Mason 130309cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 13041f12bd06SLiu Bo if (!isize || start_index > file_end) 13051f12bd06SLiu Bo return 0; 13061f12bd06SLiu Bo 13071f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13084cb5300bSChris Mason 1309e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1310a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13114cb5300bSChris Mason if (ret) 13124cb5300bSChris Mason return ret; 13134cb5300bSChris Mason i_done = 0; 1314600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 13154cb5300bSChris Mason 13164cb5300bSChris Mason /* step one, lock all the pages */ 13171f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13184cb5300bSChris Mason struct page *page; 1319600a45e1SMiao Xie again: 1320a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 13213b16a4e3SJosef Bacik start_index + i, mask); 13224cb5300bSChris Mason if (!page) 13234cb5300bSChris Mason break; 13244cb5300bSChris Mason 132532443de3SQu Wenruo ret = set_page_extent_mapped(page); 132632443de3SQu Wenruo if (ret < 0) { 132732443de3SQu Wenruo unlock_page(page); 132832443de3SQu Wenruo put_page(page); 132932443de3SQu Wenruo break; 133032443de3SQu Wenruo } 133132443de3SQu Wenruo 1332600a45e1SMiao Xie page_start = page_offset(page); 133309cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1334600a45e1SMiao Xie while (1) { 1335308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1336ff13db41SDavid Sterba &cached_state); 1337c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1338600a45e1SMiao Xie page_start); 1339308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1340e43bbe5eSDavid Sterba &cached_state); 1341600a45e1SMiao Xie if (!ordered) 1342600a45e1SMiao Xie break; 1343600a45e1SMiao Xie 1344600a45e1SMiao Xie unlock_page(page); 1345c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1346600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1347600a45e1SMiao Xie lock_page(page); 13481f12bd06SLiu Bo /* 13491f12bd06SLiu Bo * we unlocked the page above, so we need check if 13501f12bd06SLiu Bo * it was released or not. 13511f12bd06SLiu Bo */ 13521f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13531f12bd06SLiu Bo unlock_page(page); 135409cbfeafSKirill A. Shutemov put_page(page); 13551f12bd06SLiu Bo goto again; 13561f12bd06SLiu Bo } 1357600a45e1SMiao Xie } 1358600a45e1SMiao Xie 13594cb5300bSChris Mason if (!PageUptodate(page)) { 13604cb5300bSChris Mason btrfs_readpage(NULL, page); 13614cb5300bSChris Mason lock_page(page); 13624cb5300bSChris Mason if (!PageUptodate(page)) { 13634cb5300bSChris Mason unlock_page(page); 136409cbfeafSKirill A. Shutemov put_page(page); 13654cb5300bSChris Mason ret = -EIO; 13664cb5300bSChris Mason break; 13674cb5300bSChris Mason } 13684cb5300bSChris Mason } 1369600a45e1SMiao Xie 1370600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1371600a45e1SMiao Xie unlock_page(page); 137209cbfeafSKirill A. Shutemov put_page(page); 1373600a45e1SMiao Xie goto again; 1374600a45e1SMiao Xie } 1375600a45e1SMiao Xie 13764cb5300bSChris Mason pages[i] = page; 13774cb5300bSChris Mason i_done++; 13784cb5300bSChris Mason } 13794cb5300bSChris Mason if (!i_done || ret) 13804cb5300bSChris Mason goto out; 13814cb5300bSChris Mason 13821751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13834cb5300bSChris Mason goto out; 13844cb5300bSChris Mason 13854cb5300bSChris Mason /* 13864cb5300bSChris Mason * so now we have a nice long stream of locked 13874cb5300bSChris Mason * and up to date pages, lets wait on them 13884cb5300bSChris Mason */ 13894cb5300bSChris Mason for (i = 0; i < i_done; i++) 13904cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13914cb5300bSChris Mason 13924cb5300bSChris Mason page_start = page_offset(pages[0]); 139309cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13944cb5300bSChris Mason 13954cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1396ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13977f458a38SFilipe Manana 13987f458a38SFilipe Manana /* 13997f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 14007f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 14017f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 14027f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 14037f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 14047f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 14057f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 14067f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 14077f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 14087f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 14097f458a38SFilipe Manana * out if that happened. 14107f458a38SFilipe Manana */ 14117f458a38SFilipe Manana search_start = page_start; 14127f458a38SFilipe Manana while (search_start < page_end) { 14137f458a38SFilipe Manana struct extent_map *em; 14147f458a38SFilipe Manana 14157f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 14167f458a38SFilipe Manana page_end - search_start); 14177f458a38SFilipe Manana if (IS_ERR(em)) { 14187f458a38SFilipe Manana ret = PTR_ERR(em); 14197f458a38SFilipe Manana goto out_unlock_range; 14207f458a38SFilipe Manana } 14217f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 14227f458a38SFilipe Manana free_extent_map(em); 14237f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 14247f458a38SFilipe Manana ret = 0; 14257f458a38SFilipe Manana goto out_unlock_range; 14267f458a38SFilipe Manana } 14277f458a38SFilipe Manana search_start = extent_map_end(em); 14287f458a38SFilipe Manana free_extent_map(em); 14297f458a38SFilipe Manana } 14307f458a38SFilipe Manana 14314cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1432e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1433e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 14344cb5300bSChris Mason 14351f12bd06SLiu Bo if (i_done != page_cnt) { 14369e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 143728c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 14389e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 143986d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1440a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 14414cb5300bSChris Mason } 14424cb5300bSChris Mason 14434cb5300bSChris Mason 14449e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1445018ed4f7SDavid Sterba &cached_state); 14464cb5300bSChris Mason 14474cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1448e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14494cb5300bSChris Mason 14504cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14514cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14524cb5300bSChris Mason ClearPageChecked(pages[i]); 14534cb5300bSChris Mason set_page_dirty(pages[i]); 14544cb5300bSChris Mason unlock_page(pages[i]); 145509cbfeafSKirill A. Shutemov put_page(pages[i]); 14564cb5300bSChris Mason } 14578702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1458364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14594cb5300bSChris Mason return i_done; 14607f458a38SFilipe Manana 14617f458a38SFilipe Manana out_unlock_range: 14627f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14637f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14644cb5300bSChris Mason out: 14654cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14664cb5300bSChris Mason unlock_page(pages[i]); 146709cbfeafSKirill A. Shutemov put_page(pages[i]); 14684cb5300bSChris Mason } 146986d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1470a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14718702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1472364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14734cb5300bSChris Mason return ret; 14744cb5300bSChris Mason 14754cb5300bSChris Mason } 14764cb5300bSChris Mason 14774cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14784cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14794cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14804cb5300bSChris Mason { 14810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14824cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14834cb5300bSChris Mason struct file_ra_state *ra = NULL; 14844cb5300bSChris Mason unsigned long last_index; 1485151a31b2SLi Zefan u64 isize = i_size_read(inode); 1486940100a4SChris Mason u64 last_len = 0; 1487940100a4SChris Mason u64 skip = 0; 1488940100a4SChris Mason u64 defrag_end = 0; 14894cb5300bSChris Mason u64 newer_off = range->start; 1490f46b5a66SChristoph Hellwig unsigned long i; 1491008873eaSLi Zefan unsigned long ra_index = 0; 1492f46b5a66SChristoph Hellwig int ret; 14934cb5300bSChris Mason int defrag_count = 0; 14941a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1495aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 149609cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1497c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1498ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14994cb5300bSChris Mason struct page **pages = NULL; 15001e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 15014cb5300bSChris Mason 15020abd5b17SLiu Bo if (isize == 0) 15030abd5b17SLiu Bo return 0; 15040abd5b17SLiu Bo 15050abd5b17SLiu Bo if (range->start >= isize) 15060abd5b17SLiu Bo return -EINVAL; 15071a419d85SLi Zefan 15081e2ef46dSDavid Sterba if (do_compress) { 1509ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 15101a419d85SLi Zefan return -EINVAL; 15111a419d85SLi Zefan if (range->compress_type) 15121a419d85SLi Zefan compress_type = range->compress_type; 15131a419d85SLi Zefan } 1514f46b5a66SChristoph Hellwig 15150abd5b17SLiu Bo if (extent_thresh == 0) 1516ee22184bSByongho Lee extent_thresh = SZ_256K; 1517f46b5a66SChristoph Hellwig 15184cb5300bSChris Mason /* 15190a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 15200a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 15210a52d108SDavid Sterba * we don't error out. 15224cb5300bSChris Mason */ 15234cb5300bSChris Mason if (!file) { 152463e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 15250a52d108SDavid Sterba if (ra) 15264cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 15274cb5300bSChris Mason } else { 15284cb5300bSChris Mason ra = &file->f_ra; 15294cb5300bSChris Mason } 15304cb5300bSChris Mason 153163e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 15324cb5300bSChris Mason if (!pages) { 15334cb5300bSChris Mason ret = -ENOMEM; 15344cb5300bSChris Mason goto out_ra; 15354cb5300bSChris Mason } 15364cb5300bSChris Mason 15374cb5300bSChris Mason /* find the last page to defrag */ 15381e701a32SChris Mason if (range->start + range->len > range->start) { 1539151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 154009cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 15411e701a32SChris Mason } else { 154209cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 15431e701a32SChris Mason } 15441e701a32SChris Mason 15454cb5300bSChris Mason if (newer_than) { 15464cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1547ee22184bSByongho Lee &newer_off, SZ_64K); 15484cb5300bSChris Mason if (!ret) { 15494cb5300bSChris Mason range->start = newer_off; 15504cb5300bSChris Mason /* 15514cb5300bSChris Mason * we always align our defrag to help keep 15524cb5300bSChris Mason * the extents in the file evenly spaced 15534cb5300bSChris Mason */ 155409cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15554cb5300bSChris Mason } else 15564cb5300bSChris Mason goto out_ra; 15574cb5300bSChris Mason } else { 155809cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 15594cb5300bSChris Mason } 15604cb5300bSChris Mason if (!max_to_defrag) 1561070034bdSchandan max_to_defrag = last_index - i + 1; 15624cb5300bSChris Mason 15632a0f7f57SLi Zefan /* 15642a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 15652a0f7f57SLi Zefan * written sequentially. 15662a0f7f57SLi Zefan */ 15672a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 15682a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 15692a0f7f57SLi Zefan 1570f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 157109cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15724cb5300bSChris Mason /* 15734cb5300bSChris Mason * make sure we stop running if someone unmounts 15744cb5300bSChris Mason * the FS 15754cb5300bSChris Mason */ 15761751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15774cb5300bSChris Mason break; 15784cb5300bSChris Mason 15790b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15800b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1581210549ebSDavid Sterba ret = -EAGAIN; 1582210549ebSDavid Sterba break; 1583210549ebSDavid Sterba } 1584210549ebSDavid Sterba 158509cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15866c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15871e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1588940100a4SChris Mason unsigned long next; 1589940100a4SChris Mason /* 1590940100a4SChris Mason * the should_defrag function tells us how much to skip 1591940100a4SChris Mason * bump our counter by the suggested amount 1592940100a4SChris Mason */ 159309cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1594940100a4SChris Mason i = max(i + 1, next); 1595940100a4SChris Mason continue; 1596940100a4SChris Mason } 1597008873eaSLi Zefan 1598008873eaSLi Zefan if (!newer_than) { 159909cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 160009cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1601008873eaSLi Zefan cluster = min(cluster, max_cluster); 1602008873eaSLi Zefan } else { 1603008873eaSLi Zefan cluster = max_cluster; 1604008873eaSLi Zefan } 1605008873eaSLi Zefan 1606008873eaSLi Zefan if (i + cluster > ra_index) { 1607008873eaSLi Zefan ra_index = max(i, ra_index); 16080a52d108SDavid Sterba if (ra) 1609d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1610d3c0bab5SDavid Sterba file, ra_index, cluster); 1611e4826a5bSchandan ra_index += cluster; 1612008873eaSLi Zefan } 16134cb5300bSChris Mason 16145955102cSAl Viro inode_lock(inode); 1615eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1616eede2bf3SOmar Sandoval ret = -ETXTBSY; 1617eede2bf3SOmar Sandoval } else { 16181e2ef46dSDavid Sterba if (do_compress) 1619eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1620008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1621eede2bf3SOmar Sandoval } 1622ecb8bea8SLiu Bo if (ret < 0) { 16235955102cSAl Viro inode_unlock(inode); 16244cb5300bSChris Mason goto out_ra; 1625ecb8bea8SLiu Bo } 16264cb5300bSChris Mason 16274cb5300bSChris Mason defrag_count += ret; 1628d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 16295955102cSAl Viro inode_unlock(inode); 16304cb5300bSChris Mason 16314cb5300bSChris Mason if (newer_than) { 16324cb5300bSChris Mason if (newer_off == (u64)-1) 16334cb5300bSChris Mason break; 16344cb5300bSChris Mason 1635e1f041e1SLiu Bo if (ret > 0) 1636e1f041e1SLiu Bo i += ret; 1637e1f041e1SLiu Bo 16384cb5300bSChris Mason newer_off = max(newer_off + 1, 163909cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 16404cb5300bSChris Mason 1641ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1642ee22184bSByongho Lee &newer_off, SZ_64K); 16434cb5300bSChris Mason if (!ret) { 16444cb5300bSChris Mason range->start = newer_off; 164509cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16464cb5300bSChris Mason } else { 16474cb5300bSChris Mason break; 1648940100a4SChris Mason } 16494cb5300bSChris Mason } else { 1650008873eaSLi Zefan if (ret > 0) { 1651cbcc8326SLi Zefan i += ret; 165209cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1653008873eaSLi Zefan } else { 1654940100a4SChris Mason i++; 1655008873eaSLi Zefan last_len = 0; 1656008873eaSLi Zefan } 1657f46b5a66SChristoph Hellwig } 16584cb5300bSChris Mason } 1659f46b5a66SChristoph Hellwig 1660dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 16611e701a32SChris Mason filemap_flush(inode->i_mapping); 1662dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1663dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1664dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1665dec8ef90SFilipe Manana } 16661e701a32SChris Mason 16671a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 16680b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16695c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16705c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16711a419d85SLi Zefan } 16721a419d85SLi Zefan 167360ccf82fSDiego Calleja ret = defrag_count; 1674940100a4SChris Mason 16754cb5300bSChris Mason out_ra: 16761e2ef46dSDavid Sterba if (do_compress) { 16775955102cSAl Viro inode_lock(inode); 1678eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 16795955102cSAl Viro inode_unlock(inode); 1680633085c7SFilipe David Borba Manana } 16814cb5300bSChris Mason if (!file) 16824cb5300bSChris Mason kfree(ra); 16834cb5300bSChris Mason kfree(pages); 1684940100a4SChris Mason return ret; 1685f46b5a66SChristoph Hellwig } 1686f46b5a66SChristoph Hellwig 1687198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 168876dda93cSYan, Zheng void __user *arg) 1689f46b5a66SChristoph Hellwig { 16900b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16910b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1692f46b5a66SChristoph Hellwig u64 new_size; 1693f46b5a66SChristoph Hellwig u64 old_size; 1694f46b5a66SChristoph Hellwig u64 devid = 1; 16950b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1696f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1697f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1698f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1699f46b5a66SChristoph Hellwig char *sizestr; 17009a40f122SGui Hecheng char *retptr; 1701f46b5a66SChristoph Hellwig char *devstr = NULL; 1702f46b5a66SChristoph Hellwig int ret = 0; 1703f46b5a66SChristoph Hellwig int mod = 0; 1704f46b5a66SChristoph Hellwig 1705e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1706e441d54dSChris Mason return -EPERM; 1707e441d54dSChris Mason 1708198605a8SMiao Xie ret = mnt_want_write_file(file); 1709198605a8SMiao Xie if (ret) 1710198605a8SMiao Xie return ret; 1711198605a8SMiao Xie 1712c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 171397547676SMiao Xie mnt_drop_write_file(file); 1714e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1715c9e9f97bSIlya Dryomov } 1716c9e9f97bSIlya Dryomov 1717dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1718c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1719c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1720c9e9f97bSIlya Dryomov goto out; 1721c9e9f97bSIlya Dryomov } 17225516e595SMark Fasheh 17235516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1724f46b5a66SChristoph Hellwig 1725f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1726f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1727f46b5a66SChristoph Hellwig if (devstr) { 1728f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1729f46b5a66SChristoph Hellwig *devstr = '\0'; 1730f46b5a66SChristoph Hellwig devstr = vol_args->name; 173158dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 173258dfae63SZhangZhen if (ret) 173358dfae63SZhangZhen goto out_free; 1734dfd79829SMiao Xie if (!devid) { 1735dfd79829SMiao Xie ret = -EINVAL; 1736dfd79829SMiao Xie goto out_free; 1737dfd79829SMiao Xie } 17380b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1739f46b5a66SChristoph Hellwig } 1740dba60f3fSMiao Xie 1741b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1742f46b5a66SChristoph Hellwig if (!device) { 17430b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1744c1c9ff7cSGeert Uytterhoeven devid); 1745dfd79829SMiao Xie ret = -ENODEV; 1746c9e9f97bSIlya Dryomov goto out_free; 1747f46b5a66SChristoph Hellwig } 1748dba60f3fSMiao Xie 1749ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17500b246afaSJeff Mahoney btrfs_info(fs_info, 1751efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1752c1c9ff7cSGeert Uytterhoeven devid); 1753dfd79829SMiao Xie ret = -EPERM; 17544e42ae1bSLiu Bo goto out_free; 17554e42ae1bSLiu Bo } 17564e42ae1bSLiu Bo 1757f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1758f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1759f46b5a66SChristoph Hellwig else { 1760f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1761f46b5a66SChristoph Hellwig mod = -1; 1762f46b5a66SChristoph Hellwig sizestr++; 1763f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1764f46b5a66SChristoph Hellwig mod = 1; 1765f46b5a66SChristoph Hellwig sizestr++; 1766f46b5a66SChristoph Hellwig } 17679a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17689a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1769f46b5a66SChristoph Hellwig ret = -EINVAL; 1770c9e9f97bSIlya Dryomov goto out_free; 1771f46b5a66SChristoph Hellwig } 1772f46b5a66SChristoph Hellwig } 1773f46b5a66SChristoph Hellwig 1774401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1775dfd79829SMiao Xie ret = -EPERM; 177663a212abSStefan Behrens goto out_free; 177763a212abSStefan Behrens } 177863a212abSStefan Behrens 17797cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1780f46b5a66SChristoph Hellwig 1781f46b5a66SChristoph Hellwig if (mod < 0) { 1782f46b5a66SChristoph Hellwig if (new_size > old_size) { 1783f46b5a66SChristoph Hellwig ret = -EINVAL; 1784c9e9f97bSIlya Dryomov goto out_free; 1785f46b5a66SChristoph Hellwig } 1786f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1787f46b5a66SChristoph Hellwig } else if (mod > 0) { 1788eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1789902c68a4SGui Hecheng ret = -ERANGE; 1790eb8052e0SWenliang Fan goto out_free; 1791eb8052e0SWenliang Fan } 1792f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1793f46b5a66SChristoph Hellwig } 1794f46b5a66SChristoph Hellwig 1795ee22184bSByongho Lee if (new_size < SZ_256M) { 1796f46b5a66SChristoph Hellwig ret = -EINVAL; 1797c9e9f97bSIlya Dryomov goto out_free; 1798f46b5a66SChristoph Hellwig } 1799f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1800f46b5a66SChristoph Hellwig ret = -EFBIG; 1801c9e9f97bSIlya Dryomov goto out_free; 1802f46b5a66SChristoph Hellwig } 1803f46b5a66SChristoph Hellwig 180447f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1805f46b5a66SChristoph Hellwig 1806f46b5a66SChristoph Hellwig if (new_size > old_size) { 1807a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 180898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 180998d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1810c9e9f97bSIlya Dryomov goto out_free; 181198d5dc13STsutomu Itoh } 1812f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 18133a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1814ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1815f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 18160253f40eSjeff.liu } /* equal, nothing need to do */ 1817f46b5a66SChristoph Hellwig 1818faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1819faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1820faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1821faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1822faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1823c9e9f97bSIlya Dryomov out_free: 1824f46b5a66SChristoph Hellwig kfree(vol_args); 1825c9e9f97bSIlya Dryomov out: 1826c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 182718f39c41SIlya Dryomov mnt_drop_write_file(file); 1828f46b5a66SChristoph Hellwig return ret; 1829f46b5a66SChristoph Hellwig } 1830f46b5a66SChristoph Hellwig 18315d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 183252f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18335d54c67eSNikolay Borisov bool readonly, 18348696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1835f46b5a66SChristoph Hellwig { 1836f46b5a66SChristoph Hellwig int namelen; 18373de4586cSChris Mason int ret = 0; 1838f46b5a66SChristoph Hellwig 1839325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1840325c50e3SJeff Mahoney return -ENOTDIR; 1841325c50e3SJeff Mahoney 1842a874a63eSLiu Bo ret = mnt_want_write_file(file); 1843a874a63eSLiu Bo if (ret) 1844a874a63eSLiu Bo goto out; 1845a874a63eSLiu Bo 184672fd032eSSage Weil namelen = strlen(name); 184772fd032eSSage Weil if (strchr(name, '/')) { 1848f46b5a66SChristoph Hellwig ret = -EINVAL; 1849a874a63eSLiu Bo goto out_drop_write; 1850f46b5a66SChristoph Hellwig } 1851f46b5a66SChristoph Hellwig 185216780cabSChris Mason if (name[0] == '.' && 185316780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 185416780cabSChris Mason ret = -EEXIST; 1855a874a63eSLiu Bo goto out_drop_write; 185616780cabSChris Mason } 185716780cabSChris Mason 18583de4586cSChris Mason if (subvol) { 185972fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18605d54c67eSNikolay Borisov NULL, readonly, inherit); 1861cb8e7090SChristoph Hellwig } else { 18622903ff01SAl Viro struct fd src = fdget(fd); 18633de4586cSChris Mason struct inode *src_inode; 18642903ff01SAl Viro if (!src.file) { 18653de4586cSChris Mason ret = -EINVAL; 1866a874a63eSLiu Bo goto out_drop_write; 18673de4586cSChris Mason } 18683de4586cSChris Mason 1869496ad9aaSAl Viro src_inode = file_inode(src.file); 1870496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1871c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1872efe120a0SFrank Holton "Snapshot src from another FS"); 187323ad5b17SKusanagi Kouichi ret = -EXDEV; 1874d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1875d0242061SDavid Sterba /* 1876d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1877d0242061SDavid Sterba * are limited to own subvolumes only 1878d0242061SDavid Sterba */ 1879d0242061SDavid Sterba ret = -EPERM; 1880ecd18815SAl Viro } else { 1881c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 188272fd032eSSage Weil BTRFS_I(src_inode)->root, 18835d54c67eSNikolay Borisov readonly, inherit); 1884ecd18815SAl Viro } 18852903ff01SAl Viro fdput(src); 1886cb8e7090SChristoph Hellwig } 1887a874a63eSLiu Bo out_drop_write: 1888a874a63eSLiu Bo mnt_drop_write_file(file); 1889f46b5a66SChristoph Hellwig out: 189072fd032eSSage Weil return ret; 189172fd032eSSage Weil } 189272fd032eSSage Weil 189372fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1894fa0d2b9bSLi Zefan void __user *arg, int subvol) 189572fd032eSSage Weil { 1896fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 189772fd032eSSage Weil int ret; 189872fd032eSSage Weil 1899325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1900325c50e3SJeff Mahoney return -ENOTDIR; 1901325c50e3SJeff Mahoney 1902fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1903fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1904fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1905fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1906fa0d2b9bSLi Zefan 19075d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19085d54c67eSNikolay Borisov subvol, false, NULL); 1909fa0d2b9bSLi Zefan 1910fa0d2b9bSLi Zefan kfree(vol_args); 1911fa0d2b9bSLi Zefan return ret; 1912fa0d2b9bSLi Zefan } 1913fa0d2b9bSLi Zefan 1914fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1915fa0d2b9bSLi Zefan void __user *arg, int subvol) 1916fa0d2b9bSLi Zefan { 1917fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1918fa0d2b9bSLi Zefan int ret; 1919b83cc969SLi Zefan bool readonly = false; 19206f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 192172fd032eSSage Weil 1922325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1923325c50e3SJeff Mahoney return -ENOTDIR; 1924325c50e3SJeff Mahoney 1925fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1926fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1927fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1928fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1929fdfb1e4fSLi Zefan 1930673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1931b83cc969SLi Zefan ret = -EOPNOTSUPP; 1932c47ca32dSDan Carpenter goto free_args; 1933fdfb1e4fSLi Zefan } 1934fdfb1e4fSLi Zefan 1935b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1936b83cc969SLi Zefan readonly = true; 19376f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 1938*5011c5a6SDan Carpenter u64 nums; 1939*5011c5a6SDan Carpenter 1940*5011c5a6SDan Carpenter if (vol_args->size < sizeof(*inherit) || 1941*5011c5a6SDan Carpenter vol_args->size > PAGE_SIZE) { 19426f72c7e2SArne Jansen ret = -EINVAL; 1943c47ca32dSDan Carpenter goto free_args; 19446f72c7e2SArne Jansen } 19456f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19466f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19476f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1948c47ca32dSDan Carpenter goto free_args; 19496f72c7e2SArne Jansen } 1950*5011c5a6SDan Carpenter 1951*5011c5a6SDan Carpenter if (inherit->num_qgroups > PAGE_SIZE || 1952*5011c5a6SDan Carpenter inherit->num_ref_copies > PAGE_SIZE || 1953*5011c5a6SDan Carpenter inherit->num_excl_copies > PAGE_SIZE) { 1954*5011c5a6SDan Carpenter ret = -EINVAL; 1955*5011c5a6SDan Carpenter goto free_inherit; 1956*5011c5a6SDan Carpenter } 1957*5011c5a6SDan Carpenter 1958*5011c5a6SDan Carpenter nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 1959*5011c5a6SDan Carpenter 2 * inherit->num_excl_copies; 1960*5011c5a6SDan Carpenter if (vol_args->size != struct_size(inherit, qgroups, nums)) { 1961*5011c5a6SDan Carpenter ret = -EINVAL; 1962*5011c5a6SDan Carpenter goto free_inherit; 1963*5011c5a6SDan Carpenter } 19646f72c7e2SArne Jansen } 196575eaa0e2SSage Weil 19665d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19675d54c67eSNikolay Borisov subvol, readonly, inherit); 1968c47ca32dSDan Carpenter if (ret) 1969c47ca32dSDan Carpenter goto free_inherit; 1970c47ca32dSDan Carpenter free_inherit: 19716f72c7e2SArne Jansen kfree(inherit); 1972c47ca32dSDan Carpenter free_args: 1973c47ca32dSDan Carpenter kfree(vol_args); 1974f46b5a66SChristoph Hellwig return ret; 1975f46b5a66SChristoph Hellwig } 1976f46b5a66SChristoph Hellwig 19770caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19780caa102dSLi Zefan void __user *arg) 19790caa102dSLi Zefan { 1980496ad9aaSAl Viro struct inode *inode = file_inode(file); 19810b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19820caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19830caa102dSLi Zefan int ret = 0; 19840caa102dSLi Zefan u64 flags = 0; 19850caa102dSLi Zefan 19864a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19870caa102dSLi Zefan return -EINVAL; 19880caa102dSLi Zefan 19890b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19900caa102dSLi Zefan if (btrfs_root_readonly(root)) 19910caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19920b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19930caa102dSLi Zefan 19940caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19950caa102dSLi Zefan ret = -EFAULT; 19960caa102dSLi Zefan 19970caa102dSLi Zefan return ret; 19980caa102dSLi Zefan } 19990caa102dSLi Zefan 20000caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 20010caa102dSLi Zefan void __user *arg) 20020caa102dSLi Zefan { 2003496ad9aaSAl Viro struct inode *inode = file_inode(file); 20040b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 20050caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 20060caa102dSLi Zefan struct btrfs_trans_handle *trans; 20070caa102dSLi Zefan u64 root_flags; 20080caa102dSLi Zefan u64 flags; 20090caa102dSLi Zefan int ret = 0; 20100caa102dSLi Zefan 2011bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 2012bd60ea0fSDavid Sterba return -EPERM; 2013bd60ea0fSDavid Sterba 2014b9ca0664SLiu Bo ret = mnt_want_write_file(file); 2015b9ca0664SLiu Bo if (ret) 2016b9ca0664SLiu Bo goto out; 20170caa102dSLi Zefan 20184a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2019b9ca0664SLiu Bo ret = -EINVAL; 2020b9ca0664SLiu Bo goto out_drop_write; 2021b9ca0664SLiu Bo } 20220caa102dSLi Zefan 2023b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2024b9ca0664SLiu Bo ret = -EFAULT; 2025b9ca0664SLiu Bo goto out_drop_write; 2026b9ca0664SLiu Bo } 20270caa102dSLi Zefan 2028b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2029b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2030b9ca0664SLiu Bo goto out_drop_write; 2031b9ca0664SLiu Bo } 20320caa102dSLi Zefan 20330b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20340caa102dSLi Zefan 20350caa102dSLi Zefan /* nothing to do */ 20360caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2037b9ca0664SLiu Bo goto out_drop_sem; 20380caa102dSLi Zefan 20390caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20402c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20410caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20420caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20432c686537SDavid Sterba } else { 20442c686537SDavid Sterba /* 20452c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20462c686537SDavid Sterba * send 20472c686537SDavid Sterba */ 20482c686537SDavid Sterba spin_lock(&root->root_item_lock); 20492c686537SDavid Sterba if (root->send_in_progress == 0) { 20500caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20510caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20522c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20532c686537SDavid Sterba } else { 20542c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20550b246afaSJeff Mahoney btrfs_warn(fs_info, 20562c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20572c686537SDavid Sterba root->root_key.objectid); 20582c686537SDavid Sterba ret = -EPERM; 20592c686537SDavid Sterba goto out_drop_sem; 20602c686537SDavid Sterba } 20612c686537SDavid Sterba } 20620caa102dSLi Zefan 20630caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20640caa102dSLi Zefan if (IS_ERR(trans)) { 20650caa102dSLi Zefan ret = PTR_ERR(trans); 20660caa102dSLi Zefan goto out_reset; 20670caa102dSLi Zefan } 20680caa102dSLi Zefan 20690b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20700caa102dSLi Zefan &root->root_key, &root->root_item); 20719417ebc8SNikolay Borisov if (ret < 0) { 20729417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20739417ebc8SNikolay Borisov goto out_reset; 20749417ebc8SNikolay Borisov } 20750caa102dSLi Zefan 20769417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20779417ebc8SNikolay Borisov 20780caa102dSLi Zefan out_reset: 20790caa102dSLi Zefan if (ret) 20800caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2081b9ca0664SLiu Bo out_drop_sem: 20820b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2083b9ca0664SLiu Bo out_drop_write: 2084b9ca0664SLiu Bo mnt_drop_write_file(file); 2085b9ca0664SLiu Bo out: 20860caa102dSLi Zefan return ret; 20870caa102dSLi Zefan } 20880caa102dSLi Zefan 2089ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2090ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2091ac8e9819SChris Mason { 2092abc6e134SChris Mason struct btrfs_key test; 2093abc6e134SChris Mason int ret; 2094abc6e134SChris Mason 2095abc6e134SChris Mason test.objectid = sk->min_objectid; 2096abc6e134SChris Mason test.type = sk->min_type; 2097abc6e134SChris Mason test.offset = sk->min_offset; 2098abc6e134SChris Mason 2099abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2100abc6e134SChris Mason if (ret < 0) 2101ac8e9819SChris Mason return 0; 2102abc6e134SChris Mason 2103abc6e134SChris Mason test.objectid = sk->max_objectid; 2104abc6e134SChris Mason test.type = sk->max_type; 2105abc6e134SChris Mason test.offset = sk->max_offset; 2106abc6e134SChris Mason 2107abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2108abc6e134SChris Mason if (ret > 0) 2109ac8e9819SChris Mason return 0; 2110ac8e9819SChris Mason return 1; 2111ac8e9819SChris Mason } 2112ac8e9819SChris Mason 2113df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2114ac8e9819SChris Mason struct btrfs_key *key, 2115ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 21169b6e817dSGerhard Heift size_t *buf_size, 2117ba346b35SGerhard Heift char __user *ubuf, 2118ac8e9819SChris Mason unsigned long *sk_offset, 2119ac8e9819SChris Mason int *num_found) 2120ac8e9819SChris Mason { 2121ac8e9819SChris Mason u64 found_transid; 2122ac8e9819SChris Mason struct extent_buffer *leaf; 2123ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2124dd81d459SNaohiro Aota struct btrfs_key test; 2125ac8e9819SChris Mason unsigned long item_off; 2126ac8e9819SChris Mason unsigned long item_len; 2127ac8e9819SChris Mason int nritems; 2128ac8e9819SChris Mason int i; 2129ac8e9819SChris Mason int slot; 2130ac8e9819SChris Mason int ret = 0; 2131ac8e9819SChris Mason 2132ac8e9819SChris Mason leaf = path->nodes[0]; 2133ac8e9819SChris Mason slot = path->slots[0]; 2134ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2135ac8e9819SChris Mason 2136ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2137ac8e9819SChris Mason i = nritems; 2138ac8e9819SChris Mason goto advance_key; 2139ac8e9819SChris Mason } 2140ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2141ac8e9819SChris Mason 2142ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2143ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2144ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2145ac8e9819SChris Mason 214603b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 214703b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 214803b71c6cSGabriel de Perthuis continue; 214903b71c6cSGabriel de Perthuis 21509b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21518f5f6178SGerhard Heift if (*num_found) { 2152ac8e9819SChris Mason ret = 1; 21538f5f6178SGerhard Heift goto out; 21548f5f6178SGerhard Heift } 21558f5f6178SGerhard Heift 21568f5f6178SGerhard Heift /* 21578f5f6178SGerhard Heift * return one empty item back for v1, which does not 21588f5f6178SGerhard Heift * handle -EOVERFLOW 21598f5f6178SGerhard Heift */ 21608f5f6178SGerhard Heift 21619b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2162ac8e9819SChris Mason item_len = 0; 21638f5f6178SGerhard Heift ret = -EOVERFLOW; 21648f5f6178SGerhard Heift } 2165ac8e9819SChris Mason 21669b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2167ac8e9819SChris Mason ret = 1; 216825c9bc2eSGerhard Heift goto out; 2169ac8e9819SChris Mason } 2170ac8e9819SChris Mason 2171ac8e9819SChris Mason sh.objectid = key->objectid; 2172ac8e9819SChris Mason sh.offset = key->offset; 2173ac8e9819SChris Mason sh.type = key->type; 2174ac8e9819SChris Mason sh.len = item_len; 2175ac8e9819SChris Mason sh.transid = found_transid; 2176ac8e9819SChris Mason 2177a48b73ecSJosef Bacik /* 2178a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2179a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2180a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2181a48b73ecSJosef Bacik * properly this next time through 2182a48b73ecSJosef Bacik */ 2183a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2184a48b73ecSJosef Bacik ret = 0; 2185ba346b35SGerhard Heift goto out; 2186ba346b35SGerhard Heift } 2187ba346b35SGerhard Heift 2188ac8e9819SChris Mason *sk_offset += sizeof(sh); 2189ac8e9819SChris Mason 2190ac8e9819SChris Mason if (item_len) { 2191ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2192a48b73ecSJosef Bacik /* 2193a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2194a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2195a48b73ecSJosef Bacik */ 2196a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2197ba346b35SGerhard Heift item_off, item_len)) { 2198a48b73ecSJosef Bacik ret = 0; 2199a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2200ba346b35SGerhard Heift goto out; 2201ba346b35SGerhard Heift } 2202ba346b35SGerhard Heift 2203ac8e9819SChris Mason *sk_offset += item_len; 2204ac8e9819SChris Mason } 2205e2156867SHugo Mills (*num_found)++; 2206ac8e9819SChris Mason 22078f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 22088f5f6178SGerhard Heift goto out; 22098f5f6178SGerhard Heift 221025c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 221125c9bc2eSGerhard Heift ret = 1; 221225c9bc2eSGerhard Heift goto out; 221325c9bc2eSGerhard Heift } 2214ac8e9819SChris Mason } 2215ac8e9819SChris Mason advance_key: 2216ac8e9819SChris Mason ret = 0; 2217dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2218dd81d459SNaohiro Aota test.type = sk->max_type; 2219dd81d459SNaohiro Aota test.offset = sk->max_offset; 2220dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2221dd81d459SNaohiro Aota ret = 1; 2222dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2223abc6e134SChris Mason key->offset++; 2224dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2225abc6e134SChris Mason key->offset = 0; 2226abc6e134SChris Mason key->type++; 2227dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2228abc6e134SChris Mason key->offset = 0; 2229abc6e134SChris Mason key->type = 0; 2230abc6e134SChris Mason key->objectid++; 2231abc6e134SChris Mason } else 2232abc6e134SChris Mason ret = 1; 223325c9bc2eSGerhard Heift out: 2234ba346b35SGerhard Heift /* 2235ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2236ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2237ba346b35SGerhard Heift * * all items were found 2238ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2239ba346b35SGerhard Heift * leaf 2240ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2241ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2242ba346b35SGerhard Heift */ 2243ac8e9819SChris Mason return ret; 2244ac8e9819SChris Mason } 2245ac8e9819SChris Mason 2246ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 224712544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22489b6e817dSGerhard Heift size_t *buf_size, 2249ba346b35SGerhard Heift char __user *ubuf) 2250ac8e9819SChris Mason { 22510b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2252ac8e9819SChris Mason struct btrfs_root *root; 2253ac8e9819SChris Mason struct btrfs_key key; 2254ac8e9819SChris Mason struct btrfs_path *path; 2255ac8e9819SChris Mason int ret; 2256ac8e9819SChris Mason int num_found = 0; 2257ac8e9819SChris Mason unsigned long sk_offset = 0; 2258ac8e9819SChris Mason 22599b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22609b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 226112544442SGerhard Heift return -EOVERFLOW; 22629b6e817dSGerhard Heift } 226312544442SGerhard Heift 2264ac8e9819SChris Mason path = btrfs_alloc_path(); 2265ac8e9819SChris Mason if (!path) 2266ac8e9819SChris Mason return -ENOMEM; 2267ac8e9819SChris Mason 2268ac8e9819SChris Mason if (sk->tree_id == 0) { 2269ac8e9819SChris Mason /* search the root of the inode that was passed */ 227000246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2271ac8e9819SChris Mason } else { 227256e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2273ac8e9819SChris Mason if (IS_ERR(root)) { 2274ac8e9819SChris Mason btrfs_free_path(path); 2275ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2276ac8e9819SChris Mason } 2277ac8e9819SChris Mason } 2278ac8e9819SChris Mason 2279ac8e9819SChris Mason key.objectid = sk->min_objectid; 2280ac8e9819SChris Mason key.type = sk->min_type; 2281ac8e9819SChris Mason key.offset = sk->min_offset; 2282ac8e9819SChris Mason 2283ac8e9819SChris Mason while (1) { 22841c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22851c78544eSFilipe Manana *buf_size - sk_offset); 2286a48b73ecSJosef Bacik if (ret) 2287a48b73ecSJosef Bacik break; 2288a48b73ecSJosef Bacik 22896174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2290ac8e9819SChris Mason if (ret != 0) { 2291ac8e9819SChris Mason if (ret > 0) 2292ac8e9819SChris Mason ret = 0; 2293ac8e9819SChris Mason goto err; 2294ac8e9819SChris Mason } 2295df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2296ac8e9819SChris Mason &sk_offset, &num_found); 2297b3b4aa74SDavid Sterba btrfs_release_path(path); 229825c9bc2eSGerhard Heift if (ret) 2299ac8e9819SChris Mason break; 2300ac8e9819SChris Mason 2301ac8e9819SChris Mason } 23028f5f6178SGerhard Heift if (ret > 0) 2303ac8e9819SChris Mason ret = 0; 2304ac8e9819SChris Mason err: 2305ac8e9819SChris Mason sk->nr_items = num_found; 230600246528SJosef Bacik btrfs_put_root(root); 2307ac8e9819SChris Mason btrfs_free_path(path); 2308ac8e9819SChris Mason return ret; 2309ac8e9819SChris Mason } 2310ac8e9819SChris Mason 2311ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2312ac8e9819SChris Mason void __user *argp) 2313ac8e9819SChris Mason { 2314ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2315ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2316ac8e9819SChris Mason struct inode *inode; 2317ac8e9819SChris Mason int ret; 23189b6e817dSGerhard Heift size_t buf_size; 2319ac8e9819SChris Mason 2320ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2321ac8e9819SChris Mason return -EPERM; 2322ac8e9819SChris Mason 2323ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2324ac8e9819SChris Mason 2325ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2326ba346b35SGerhard Heift return -EFAULT; 2327ba346b35SGerhard Heift 2328ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2329ac8e9819SChris Mason 2330496ad9aaSAl Viro inode = file_inode(file); 2331ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23328f5f6178SGerhard Heift 23338f5f6178SGerhard Heift /* 23348f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23358f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23368f5f6178SGerhard Heift */ 23378f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23388f5f6178SGerhard Heift ret = 0; 23398f5f6178SGerhard Heift 2340ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2341ac8e9819SChris Mason ret = -EFAULT; 2342ac8e9819SChris Mason return ret; 2343ac8e9819SChris Mason } 2344ac8e9819SChris Mason 2345cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2346cc68a8a5SGerhard Heift void __user *argp) 2347cc68a8a5SGerhard Heift { 2348cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2349cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2350cc68a8a5SGerhard Heift struct inode *inode; 2351cc68a8a5SGerhard Heift int ret; 2352cc68a8a5SGerhard Heift size_t buf_size; 2353ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2354cc68a8a5SGerhard Heift 2355cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2356cc68a8a5SGerhard Heift return -EPERM; 2357cc68a8a5SGerhard Heift 2358cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2359cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2360cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2361cc68a8a5SGerhard Heift return -EFAULT; 2362cc68a8a5SGerhard Heift 2363cc68a8a5SGerhard Heift buf_size = args.buf_size; 2364cc68a8a5SGerhard Heift 2365cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2366cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2367cc68a8a5SGerhard Heift buf_size = buf_limit; 2368cc68a8a5SGerhard Heift 2369cc68a8a5SGerhard Heift inode = file_inode(file); 2370cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2371718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2372cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2373cc68a8a5SGerhard Heift ret = -EFAULT; 2374cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2375cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2376cc68a8a5SGerhard Heift ret = -EFAULT; 2377cc68a8a5SGerhard Heift 237876dda93cSYan, Zheng return ret; 237976dda93cSYan, Zheng } 238076dda93cSYan, Zheng 238198d377a0STARUISI Hiroaki /* 2382ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2383ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 238498d377a0STARUISI Hiroaki */ 238598d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 238698d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 238798d377a0STARUISI Hiroaki { 238898d377a0STARUISI Hiroaki struct btrfs_root *root; 238998d377a0STARUISI Hiroaki struct btrfs_key key; 2390ac8e9819SChris Mason char *ptr; 239198d377a0STARUISI Hiroaki int ret = -1; 239298d377a0STARUISI Hiroaki int slot; 239398d377a0STARUISI Hiroaki int len; 239498d377a0STARUISI Hiroaki int total_len = 0; 239598d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 239698d377a0STARUISI Hiroaki struct extent_buffer *l; 239798d377a0STARUISI Hiroaki struct btrfs_path *path; 239898d377a0STARUISI Hiroaki 239998d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 240098d377a0STARUISI Hiroaki name[0]='\0'; 240198d377a0STARUISI Hiroaki return 0; 240298d377a0STARUISI Hiroaki } 240398d377a0STARUISI Hiroaki 240498d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 240598d377a0STARUISI Hiroaki if (!path) 240698d377a0STARUISI Hiroaki return -ENOMEM; 240798d377a0STARUISI Hiroaki 2408c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 240998d377a0STARUISI Hiroaki 241056e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 241198d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2412ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 241388234012SJosef Bacik root = NULL; 241488234012SJosef Bacik goto out; 241588234012SJosef Bacik } 241698d377a0STARUISI Hiroaki 241798d377a0STARUISI Hiroaki key.objectid = dirid; 241898d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 24198ad6fcabSChris Mason key.offset = (u64)-1; 242098d377a0STARUISI Hiroaki 242198d377a0STARUISI Hiroaki while (1) { 242298d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 242398d377a0STARUISI Hiroaki if (ret < 0) 242498d377a0STARUISI Hiroaki goto out; 242518674c6cSFilipe David Borba Manana else if (ret > 0) { 242618674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 242718674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 242818674c6cSFilipe David Borba Manana if (ret < 0) 242918674c6cSFilipe David Borba Manana goto out; 243018674c6cSFilipe David Borba Manana else if (ret > 0) { 2431ac8e9819SChris Mason ret = -ENOENT; 243298d377a0STARUISI Hiroaki goto out; 2433ac8e9819SChris Mason } 243418674c6cSFilipe David Borba Manana } 243518674c6cSFilipe David Borba Manana 243618674c6cSFilipe David Borba Manana l = path->nodes[0]; 243718674c6cSFilipe David Borba Manana slot = path->slots[0]; 243818674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 243998d377a0STARUISI Hiroaki 244098d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 244198d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 244298d377a0STARUISI Hiroaki ptr -= len + 1; 244398d377a0STARUISI Hiroaki total_len += len + 1; 2444a696cf35SFilipe David Borba Manana if (ptr < name) { 2445a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 244698d377a0STARUISI Hiroaki goto out; 2447a696cf35SFilipe David Borba Manana } 244898d377a0STARUISI Hiroaki 244998d377a0STARUISI Hiroaki *(ptr + len) = '/'; 245098d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 245198d377a0STARUISI Hiroaki 245298d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 245398d377a0STARUISI Hiroaki break; 245498d377a0STARUISI Hiroaki 2455b3b4aa74SDavid Sterba btrfs_release_path(path); 245698d377a0STARUISI Hiroaki key.objectid = key.offset; 24578ad6fcabSChris Mason key.offset = (u64)-1; 245898d377a0STARUISI Hiroaki dirid = key.objectid; 245998d377a0STARUISI Hiroaki } 246077906a50SLi Zefan memmove(name, ptr, total_len); 246198d377a0STARUISI Hiroaki name[total_len] = '\0'; 246298d377a0STARUISI Hiroaki ret = 0; 246398d377a0STARUISI Hiroaki out: 246400246528SJosef Bacik btrfs_put_root(root); 246598d377a0STARUISI Hiroaki btrfs_free_path(path); 2466ac8e9819SChris Mason return ret; 2467ac8e9819SChris Mason } 2468ac8e9819SChris Mason 246923d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 247023d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 247123d0b79dSTomohiro Misono { 247223d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 247323d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 247423d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 247523d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 247623d0b79dSTomohiro Misono u64 dirid = args->dirid; 247723d0b79dSTomohiro Misono unsigned long item_off; 247823d0b79dSTomohiro Misono unsigned long item_len; 247923d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 248023d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2481b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 248223d0b79dSTomohiro Misono struct btrfs_path *path; 248323d0b79dSTomohiro Misono struct btrfs_key key, key2; 248423d0b79dSTomohiro Misono struct extent_buffer *leaf; 248523d0b79dSTomohiro Misono struct inode *temp_inode; 248623d0b79dSTomohiro Misono char *ptr; 248723d0b79dSTomohiro Misono int slot; 248823d0b79dSTomohiro Misono int len; 248923d0b79dSTomohiro Misono int total_len = 0; 249023d0b79dSTomohiro Misono int ret; 249123d0b79dSTomohiro Misono 249223d0b79dSTomohiro Misono path = btrfs_alloc_path(); 249323d0b79dSTomohiro Misono if (!path) 249423d0b79dSTomohiro Misono return -ENOMEM; 249523d0b79dSTomohiro Misono 249623d0b79dSTomohiro Misono /* 249723d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 249823d0b79dSTomohiro Misono * construct the path in from the bottom up. 249923d0b79dSTomohiro Misono */ 250023d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 250123d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 250223d0b79dSTomohiro Misono 250356e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 250423d0b79dSTomohiro Misono if (IS_ERR(root)) { 250523d0b79dSTomohiro Misono ret = PTR_ERR(root); 250623d0b79dSTomohiro Misono goto out; 250723d0b79dSTomohiro Misono } 250823d0b79dSTomohiro Misono 250923d0b79dSTomohiro Misono key.objectid = dirid; 251023d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 251123d0b79dSTomohiro Misono key.offset = (u64)-1; 251223d0b79dSTomohiro Misono while (1) { 251323d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 251423d0b79dSTomohiro Misono if (ret < 0) { 2515b8a49ae1SJosef Bacik goto out_put; 251623d0b79dSTomohiro Misono } else if (ret > 0) { 251723d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 251823d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 251923d0b79dSTomohiro Misono if (ret < 0) { 2520b8a49ae1SJosef Bacik goto out_put; 252123d0b79dSTomohiro Misono } else if (ret > 0) { 252223d0b79dSTomohiro Misono ret = -ENOENT; 2523b8a49ae1SJosef Bacik goto out_put; 252423d0b79dSTomohiro Misono } 252523d0b79dSTomohiro Misono } 252623d0b79dSTomohiro Misono 252723d0b79dSTomohiro Misono leaf = path->nodes[0]; 252823d0b79dSTomohiro Misono slot = path->slots[0]; 252923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 253023d0b79dSTomohiro Misono 253123d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 253223d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 253323d0b79dSTomohiro Misono ptr -= len + 1; 253423d0b79dSTomohiro Misono total_len += len + 1; 253523d0b79dSTomohiro Misono if (ptr < args->path) { 253623d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2537b8a49ae1SJosef Bacik goto out_put; 253823d0b79dSTomohiro Misono } 253923d0b79dSTomohiro Misono 254023d0b79dSTomohiro Misono *(ptr + len) = '/'; 254123d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 254223d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 254323d0b79dSTomohiro Misono 254423d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 254523d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 254623d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 254723d0b79dSTomohiro Misono if (ret < 0) { 2548b8a49ae1SJosef Bacik goto out_put; 254923d0b79dSTomohiro Misono } else if (ret > 0) { 255023d0b79dSTomohiro Misono ret = -ENOENT; 2551b8a49ae1SJosef Bacik goto out_put; 255223d0b79dSTomohiro Misono } 255323d0b79dSTomohiro Misono 255423d0b79dSTomohiro Misono leaf = path->nodes[0]; 255523d0b79dSTomohiro Misono slot = path->slots[0]; 255623d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 255723d0b79dSTomohiro Misono if (key2.objectid != dirid) { 255823d0b79dSTomohiro Misono ret = -ENOENT; 2559b8a49ae1SJosef Bacik goto out_put; 256023d0b79dSTomohiro Misono } 256123d0b79dSTomohiro Misono 25620202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25633ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25643ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2565b8a49ae1SJosef Bacik goto out_put; 25663ca57bd6SMisono Tomohiro } 256723d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 256823d0b79dSTomohiro Misono iput(temp_inode); 256923d0b79dSTomohiro Misono if (ret) { 257023d0b79dSTomohiro Misono ret = -EACCES; 2571b8a49ae1SJosef Bacik goto out_put; 257223d0b79dSTomohiro Misono } 257323d0b79dSTomohiro Misono 257423d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 257523d0b79dSTomohiro Misono break; 257623d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 257723d0b79dSTomohiro Misono ret = -EACCES; 2578b8a49ae1SJosef Bacik goto out_put; 257923d0b79dSTomohiro Misono } 258023d0b79dSTomohiro Misono 258123d0b79dSTomohiro Misono btrfs_release_path(path); 258223d0b79dSTomohiro Misono key.objectid = key.offset; 258323d0b79dSTomohiro Misono key.offset = (u64)-1; 258423d0b79dSTomohiro Misono dirid = key.objectid; 258523d0b79dSTomohiro Misono } 258623d0b79dSTomohiro Misono 258723d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 258823d0b79dSTomohiro Misono args->path[total_len] = '\0'; 258900246528SJosef Bacik btrfs_put_root(root); 2590b8a49ae1SJosef Bacik root = NULL; 259123d0b79dSTomohiro Misono btrfs_release_path(path); 259223d0b79dSTomohiro Misono } 259323d0b79dSTomohiro Misono 259423d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 259523d0b79dSTomohiro Misono key.objectid = treeid; 259623d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 259723d0b79dSTomohiro Misono key.offset = args->treeid; 2598b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 259923d0b79dSTomohiro Misono if (ret < 0) { 260023d0b79dSTomohiro Misono goto out; 260123d0b79dSTomohiro Misono } else if (ret > 0) { 260223d0b79dSTomohiro Misono ret = -ENOENT; 260323d0b79dSTomohiro Misono goto out; 260423d0b79dSTomohiro Misono } 260523d0b79dSTomohiro Misono 260623d0b79dSTomohiro Misono leaf = path->nodes[0]; 260723d0b79dSTomohiro Misono slot = path->slots[0]; 260823d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 260923d0b79dSTomohiro Misono 261023d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 261123d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 261223d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 261323d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 261423d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 261523d0b79dSTomohiro Misono ret = -EINVAL; 261623d0b79dSTomohiro Misono goto out; 261723d0b79dSTomohiro Misono } 261823d0b79dSTomohiro Misono 261923d0b79dSTomohiro Misono /* Copy subvolume's name */ 262023d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 262123d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 262223d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 262323d0b79dSTomohiro Misono args->name[item_len] = 0; 262423d0b79dSTomohiro Misono 2625b8a49ae1SJosef Bacik out_put: 262600246528SJosef Bacik btrfs_put_root(root); 262723d0b79dSTomohiro Misono out: 262823d0b79dSTomohiro Misono btrfs_free_path(path); 262923d0b79dSTomohiro Misono return ret; 263023d0b79dSTomohiro Misono } 263123d0b79dSTomohiro Misono 2632ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2633ac8e9819SChris Mason void __user *argp) 2634ac8e9819SChris Mason { 2635ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2636ac8e9819SChris Mason struct inode *inode; 263701b810b8SDavid Sterba int ret = 0; 2638ac8e9819SChris Mason 26392354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26402354d08fSJulia Lawall if (IS_ERR(args)) 26412354d08fSJulia Lawall return PTR_ERR(args); 2642c2b96929SDan Carpenter 2643496ad9aaSAl Viro inode = file_inode(file); 2644ac8e9819SChris Mason 264501b810b8SDavid Sterba /* 264601b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 264701b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 264801b810b8SDavid Sterba */ 26491b53ac4dSChris Mason if (args->treeid == 0) 26501b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26511b53ac4dSChris Mason 265201b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 265301b810b8SDavid Sterba args->name[0] = 0; 265401b810b8SDavid Sterba goto out; 265501b810b8SDavid Sterba } 265601b810b8SDavid Sterba 265701b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 265801b810b8SDavid Sterba ret = -EPERM; 265901b810b8SDavid Sterba goto out; 266001b810b8SDavid Sterba } 266101b810b8SDavid Sterba 2662ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2663ac8e9819SChris Mason args->treeid, args->objectid, 2664ac8e9819SChris Mason args->name); 2665ac8e9819SChris Mason 266601b810b8SDavid Sterba out: 2667ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2668ac8e9819SChris Mason ret = -EFAULT; 2669ac8e9819SChris Mason 2670ac8e9819SChris Mason kfree(args); 267198d377a0STARUISI Hiroaki return ret; 267298d377a0STARUISI Hiroaki } 267398d377a0STARUISI Hiroaki 267423d0b79dSTomohiro Misono /* 267523d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 267623d0b79dSTomohiro Misono * 267723d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 267823d0b79dSTomohiro Misono * 267923d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 268023d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 268123d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 268223d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 268323d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 268423d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 268523d0b79dSTomohiro Misono */ 268623d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 268723d0b79dSTomohiro Misono { 268823d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 268923d0b79dSTomohiro Misono struct inode *inode; 269023d0b79dSTomohiro Misono int ret; 269123d0b79dSTomohiro Misono 269223d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 269323d0b79dSTomohiro Misono if (IS_ERR(args)) 269423d0b79dSTomohiro Misono return PTR_ERR(args); 269523d0b79dSTomohiro Misono 269623d0b79dSTomohiro Misono inode = file_inode(file); 269723d0b79dSTomohiro Misono 269823d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 269923d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 270023d0b79dSTomohiro Misono /* 270123d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 270223d0b79dSTomohiro Misono * called 270323d0b79dSTomohiro Misono */ 270423d0b79dSTomohiro Misono kfree(args); 270523d0b79dSTomohiro Misono return -EACCES; 270623d0b79dSTomohiro Misono } 270723d0b79dSTomohiro Misono 270823d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 270923d0b79dSTomohiro Misono 271023d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 271123d0b79dSTomohiro Misono ret = -EFAULT; 271223d0b79dSTomohiro Misono 271323d0b79dSTomohiro Misono kfree(args); 271423d0b79dSTomohiro Misono return ret; 271523d0b79dSTomohiro Misono } 271623d0b79dSTomohiro Misono 2717b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2718b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2719b64ec075STomohiro Misono { 2720b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2721b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2722b64ec075STomohiro Misono struct btrfs_root *root; 2723b64ec075STomohiro Misono struct btrfs_path *path; 2724b64ec075STomohiro Misono struct btrfs_key key; 2725b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2726b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2727b64ec075STomohiro Misono struct extent_buffer *leaf; 2728b64ec075STomohiro Misono unsigned long item_off; 2729b64ec075STomohiro Misono unsigned long item_len; 2730b64ec075STomohiro Misono struct inode *inode; 2731b64ec075STomohiro Misono int slot; 2732b64ec075STomohiro Misono int ret = 0; 2733b64ec075STomohiro Misono 2734b64ec075STomohiro Misono path = btrfs_alloc_path(); 2735b64ec075STomohiro Misono if (!path) 2736b64ec075STomohiro Misono return -ENOMEM; 2737b64ec075STomohiro Misono 2738b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2739b64ec075STomohiro Misono if (!subvol_info) { 2740b64ec075STomohiro Misono btrfs_free_path(path); 2741b64ec075STomohiro Misono return -ENOMEM; 2742b64ec075STomohiro Misono } 2743b64ec075STomohiro Misono 2744b64ec075STomohiro Misono inode = file_inode(file); 2745b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2746b64ec075STomohiro Misono 2747b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2748b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 274956e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2750b64ec075STomohiro Misono if (IS_ERR(root)) { 2751b64ec075STomohiro Misono ret = PTR_ERR(root); 275204734e84SJosef Bacik goto out_free; 275304734e84SJosef Bacik } 2754b64ec075STomohiro Misono root_item = &root->root_item; 2755b64ec075STomohiro Misono 2756b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2757b64ec075STomohiro Misono 2758b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2759b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2760b64ec075STomohiro Misono 2761b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2762b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2763b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2764b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2765b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2766b64ec075STomohiro Misono 2767b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2768b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2769b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2770b64ec075STomohiro Misono 2771b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2772b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2773b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2774b64ec075STomohiro Misono 2775b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2776b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2777b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2778b64ec075STomohiro Misono 2779b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2780b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2781b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2782b64ec075STomohiro Misono 2783b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2784b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2785b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2786b64ec075STomohiro Misono key.offset = 0; 278704734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2788b64ec075STomohiro Misono if (ret < 0) { 2789b64ec075STomohiro Misono goto out; 2790b64ec075STomohiro Misono } else if (path->slots[0] >= 2791b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 279204734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2793b64ec075STomohiro Misono if (ret < 0) { 2794b64ec075STomohiro Misono goto out; 2795b64ec075STomohiro Misono } else if (ret > 0) { 2796b64ec075STomohiro Misono ret = -EUCLEAN; 2797b64ec075STomohiro Misono goto out; 2798b64ec075STomohiro Misono } 2799b64ec075STomohiro Misono } 2800b64ec075STomohiro Misono 2801b64ec075STomohiro Misono leaf = path->nodes[0]; 2802b64ec075STomohiro Misono slot = path->slots[0]; 2803b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2804b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2805b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2806b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2807b64ec075STomohiro Misono 2808b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2809b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2810b64ec075STomohiro Misono 2811b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2812b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2813b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2814b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2815b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2816b64ec075STomohiro Misono item_off, item_len); 2817b64ec075STomohiro Misono } else { 2818b64ec075STomohiro Misono ret = -ENOENT; 2819b64ec075STomohiro Misono goto out; 2820b64ec075STomohiro Misono } 2821b64ec075STomohiro Misono } 2822b64ec075STomohiro Misono 2823b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2824b64ec075STomohiro Misono ret = -EFAULT; 2825b64ec075STomohiro Misono 2826b64ec075STomohiro Misono out: 282700246528SJosef Bacik btrfs_put_root(root); 282804734e84SJosef Bacik out_free: 2829b64ec075STomohiro Misono btrfs_free_path(path); 2830b091f7feSWaiman Long kfree(subvol_info); 2831b64ec075STomohiro Misono return ret; 2832b64ec075STomohiro Misono } 2833b64ec075STomohiro Misono 283442e4b520STomohiro Misono /* 283542e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 283642e4b520STomohiro Misono * except the subvolume name. 283742e4b520STomohiro Misono */ 283842e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 283942e4b520STomohiro Misono { 284042e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 284142e4b520STomohiro Misono struct btrfs_root_ref *rref; 284242e4b520STomohiro Misono struct btrfs_root *root; 284342e4b520STomohiro Misono struct btrfs_path *path; 284442e4b520STomohiro Misono struct btrfs_key key; 284542e4b520STomohiro Misono struct extent_buffer *leaf; 284642e4b520STomohiro Misono struct inode *inode; 284742e4b520STomohiro Misono u64 objectid; 284842e4b520STomohiro Misono int slot; 284942e4b520STomohiro Misono int ret; 285042e4b520STomohiro Misono u8 found; 285142e4b520STomohiro Misono 285242e4b520STomohiro Misono path = btrfs_alloc_path(); 285342e4b520STomohiro Misono if (!path) 285442e4b520STomohiro Misono return -ENOMEM; 285542e4b520STomohiro Misono 285642e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 285742e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 285842e4b520STomohiro Misono btrfs_free_path(path); 285942e4b520STomohiro Misono return PTR_ERR(rootrefs); 286042e4b520STomohiro Misono } 286142e4b520STomohiro Misono 286242e4b520STomohiro Misono inode = file_inode(file); 286342e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 286442e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 286542e4b520STomohiro Misono 286642e4b520STomohiro Misono key.objectid = objectid; 286742e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 286842e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 286942e4b520STomohiro Misono found = 0; 287042e4b520STomohiro Misono 287142e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 287242e4b520STomohiro Misono if (ret < 0) { 287342e4b520STomohiro Misono goto out; 287442e4b520STomohiro Misono } else if (path->slots[0] >= 287542e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 287642e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 287742e4b520STomohiro Misono if (ret < 0) { 287842e4b520STomohiro Misono goto out; 287942e4b520STomohiro Misono } else if (ret > 0) { 288042e4b520STomohiro Misono ret = -EUCLEAN; 288142e4b520STomohiro Misono goto out; 288242e4b520STomohiro Misono } 288342e4b520STomohiro Misono } 288442e4b520STomohiro Misono while (1) { 288542e4b520STomohiro Misono leaf = path->nodes[0]; 288642e4b520STomohiro Misono slot = path->slots[0]; 288742e4b520STomohiro Misono 288842e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 288942e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 289042e4b520STomohiro Misono ret = 0; 289142e4b520STomohiro Misono goto out; 289242e4b520STomohiro Misono } 289342e4b520STomohiro Misono 289442e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 289542e4b520STomohiro Misono ret = -EOVERFLOW; 289642e4b520STomohiro Misono goto out; 289742e4b520STomohiro Misono } 289842e4b520STomohiro Misono 289942e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 290042e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 290142e4b520STomohiro Misono rootrefs->rootref[found].dirid = 290242e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 290342e4b520STomohiro Misono found++; 290442e4b520STomohiro Misono 290542e4b520STomohiro Misono ret = btrfs_next_item(root, path); 290642e4b520STomohiro Misono if (ret < 0) { 290742e4b520STomohiro Misono goto out; 290842e4b520STomohiro Misono } else if (ret > 0) { 290942e4b520STomohiro Misono ret = -EUCLEAN; 291042e4b520STomohiro Misono goto out; 291142e4b520STomohiro Misono } 291242e4b520STomohiro Misono } 291342e4b520STomohiro Misono 291442e4b520STomohiro Misono out: 291542e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 291642e4b520STomohiro Misono rootrefs->num_items = found; 291742e4b520STomohiro Misono /* update min_treeid for next search */ 291842e4b520STomohiro Misono if (found) 291942e4b520STomohiro Misono rootrefs->min_treeid = 292042e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 292142e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 292242e4b520STomohiro Misono ret = -EFAULT; 292342e4b520STomohiro Misono } 292442e4b520STomohiro Misono 292542e4b520STomohiro Misono kfree(rootrefs); 292642e4b520STomohiro Misono btrfs_free_path(path); 292742e4b520STomohiro Misono 292842e4b520STomohiro Misono return ret; 292942e4b520STomohiro Misono } 293042e4b520STomohiro Misono 293176dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2932949964c9SMarcos Paulo de Souza void __user *arg, 2933949964c9SMarcos Paulo de Souza bool destroy_v2) 293476dda93cSYan, Zheng { 293554563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 293776dda93cSYan, Zheng struct dentry *dentry; 29382b0143b5SDavid Howells struct inode *dir = d_inode(parent); 293976dda93cSYan, Zheng struct inode *inode; 294076dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 294176dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2942949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2943949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2944949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2945949964c9SMarcos Paulo de Souza int subvol_namelen; 294676dda93cSYan, Zheng int err = 0; 2947949964c9SMarcos Paulo de Souza bool destroy_parent = false; 294876dda93cSYan, Zheng 2949949964c9SMarcos Paulo de Souza if (destroy_v2) { 2950949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2951949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2952949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2953325c50e3SJeff Mahoney 2954949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2955949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2956949964c9SMarcos Paulo de Souza goto out; 2957949964c9SMarcos Paulo de Souza } 295876dda93cSYan, Zheng 2959949964c9SMarcos Paulo de Souza /* 2960949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2961949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2962949964c9SMarcos Paulo de Souza */ 2963949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2964949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2965949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2966949964c9SMarcos Paulo de Souza 2967949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2968949964c9SMarcos Paulo de Souza if (err) 2969949964c9SMarcos Paulo de Souza goto out; 2970949964c9SMarcos Paulo de Souza } else { 2971949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 297276dda93cSYan, Zheng err = -EINVAL; 297376dda93cSYan, Zheng goto out; 297476dda93cSYan, Zheng } 297576dda93cSYan, Zheng 2976a561be71SAl Viro err = mnt_want_write_file(file); 297776dda93cSYan, Zheng if (err) 297876dda93cSYan, Zheng goto out; 297976dda93cSYan, Zheng 2980949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2981949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2982949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2983949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2984949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2985949964c9SMarcos Paulo de Souza goto out_drop_write; 2986949964c9SMarcos Paulo de Souza } 2987949964c9SMarcos Paulo de Souza 2988949964c9SMarcos Paulo de Souza /* 2989949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2990949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2991949964c9SMarcos Paulo de Souza */ 2992949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2993949964c9SMarcos Paulo de Souza 2994949964c9SMarcos Paulo de Souza /* 2995949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2996949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2997949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2998949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2999949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 3000949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 3001949964c9SMarcos Paulo de Souza */ 3002949964c9SMarcos Paulo de Souza dput(dentry); 3003949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 3004949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 3005949964c9SMarcos Paulo de Souza goto out_drop_write; 3006949964c9SMarcos Paulo de Souza } 3007949964c9SMarcos Paulo de Souza dir = d_inode(parent); 3008949964c9SMarcos Paulo de Souza 3009949964c9SMarcos Paulo de Souza /* 3010949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 3011949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 3012949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 3013949964c9SMarcos Paulo de Souza * new parent dentry. 3014949964c9SMarcos Paulo de Souza */ 3015949964c9SMarcos Paulo de Souza destroy_parent = true; 3016949964c9SMarcos Paulo de Souza 3017949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3018949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3019949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3020949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3021949964c9SMarcos Paulo de Souza goto free_parent; 3022949964c9SMarcos Paulo de Souza } 3023949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 3024949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3025949964c9SMarcos Paulo de Souza } 3026949964c9SMarcos Paulo de Souza } else { 3027949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3028949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3029949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3030949964c9SMarcos Paulo de Souza 3031949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3032949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3033949964c9SMarcos Paulo de Souza 3034949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3035949964c9SMarcos Paulo de Souza if (err) 3036949964c9SMarcos Paulo de Souza goto out; 3037949964c9SMarcos Paulo de Souza } 3038949964c9SMarcos Paulo de Souza 3039949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3040949964c9SMarcos Paulo de Souza 3041949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3042949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3043949964c9SMarcos Paulo de Souza err = -EINVAL; 3044949964c9SMarcos Paulo de Souza goto free_subvol_name; 3045949964c9SMarcos Paulo de Souza } 3046949964c9SMarcos Paulo de Souza 3047949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3048949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3049949964c9SMarcos Paulo de Souza goto free_subvol_name; 3050949964c9SMarcos Paulo de Souza } 3051521e0546SDavid Sterba 305200235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 305300235411SAl Viro if (err == -EINTR) 3054949964c9SMarcos Paulo de Souza goto free_subvol_name; 3055949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 305676dda93cSYan, Zheng if (IS_ERR(dentry)) { 305776dda93cSYan, Zheng err = PTR_ERR(dentry); 305876dda93cSYan, Zheng goto out_unlock_dir; 305976dda93cSYan, Zheng } 306076dda93cSYan, Zheng 30612b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 306276dda93cSYan, Zheng err = -ENOENT; 306376dda93cSYan, Zheng goto out_dput; 306476dda93cSYan, Zheng } 306576dda93cSYan, Zheng 30662b0143b5SDavid Howells inode = d_inode(dentry); 30674260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30684260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30694260f7c7SSage Weil /* 30704260f7c7SSage Weil * Regular user. Only allow this with a special mount 30714260f7c7SSage Weil * option, when the user has write+exec access to the 30724260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30734260f7c7SSage Weil * allowed. 30744260f7c7SSage Weil * 30754260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30764260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30774260f7c7SSage Weil * otherwise be able to delete. 30784260f7c7SSage Weil * 30794260f7c7SSage Weil * Users who want to delete empty subvols should try 30804260f7c7SSage Weil * rmdir(2). 30814260f7c7SSage Weil */ 30824260f7c7SSage Weil err = -EPERM; 30830b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30844260f7c7SSage Weil goto out_dput; 30854260f7c7SSage Weil 30864260f7c7SSage Weil /* 30874260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30884260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30894260f7c7SSage Weil * must be called on the dentry referencing the root 30904260f7c7SSage Weil * of the subvol, not a random directory contained 30914260f7c7SSage Weil * within it. 30924260f7c7SSage Weil */ 30934260f7c7SSage Weil err = -EINVAL; 30944260f7c7SSage Weil if (root == dest) 30954260f7c7SSage Weil goto out_dput; 30964260f7c7SSage Weil 30974260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30984260f7c7SSage Weil if (err) 30994260f7c7SSage Weil goto out_dput; 31005c39da5bSMiao Xie } 31014260f7c7SSage Weil 31025c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 31034260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 31044260f7c7SSage Weil if (err) 31054260f7c7SSage Weil goto out_dput; 31064260f7c7SSage Weil 31074a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 310876dda93cSYan, Zheng err = -EINVAL; 310976dda93cSYan, Zheng goto out_dput; 311076dda93cSYan, Zheng } 311176dda93cSYan, Zheng 31125955102cSAl Viro inode_lock(inode); 3113f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 31145955102cSAl Viro inode_unlock(inode); 311546008d9dSAmir Goldstein if (!err) { 311646008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 311776dda93cSYan, Zheng d_delete(dentry); 311846008d9dSAmir Goldstein } 3119fa6ac876SLiu Bo 312076dda93cSYan, Zheng out_dput: 312176dda93cSYan, Zheng dput(dentry); 312276dda93cSYan, Zheng out_unlock_dir: 31235955102cSAl Viro inode_unlock(dir); 3124949964c9SMarcos Paulo de Souza free_subvol_name: 3125949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3126949964c9SMarcos Paulo de Souza free_parent: 3127949964c9SMarcos Paulo de Souza if (destroy_parent) 3128949964c9SMarcos Paulo de Souza dput(parent); 312900235411SAl Viro out_drop_write: 31302a79f17eSAl Viro mnt_drop_write_file(file); 313176dda93cSYan, Zheng out: 3132949964c9SMarcos Paulo de Souza kfree(vol_args2); 313376dda93cSYan, Zheng kfree(vol_args); 313476dda93cSYan, Zheng return err; 313576dda93cSYan, Zheng } 313676dda93cSYan, Zheng 31371e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3138f46b5a66SChristoph Hellwig { 3139496ad9aaSAl Viro struct inode *inode = file_inode(file); 3140f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31411e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3142c146afadSYan Zheng int ret; 3143c146afadSYan Zheng 314425122d15SIlya Dryomov ret = mnt_want_write_file(file); 314525122d15SIlya Dryomov if (ret) 314625122d15SIlya Dryomov return ret; 3147b83cc969SLi Zefan 314825122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 314925122d15SIlya Dryomov ret = -EROFS; 315025122d15SIlya Dryomov goto out; 31515ac00addSStefan Behrens } 3152f46b5a66SChristoph Hellwig 3153f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3154f46b5a66SChristoph Hellwig case S_IFDIR: 3155e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3156e441d54dSChris Mason ret = -EPERM; 3157e441d54dSChris Mason goto out; 3158e441d54dSChris Mason } 3159de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3160f46b5a66SChristoph Hellwig break; 3161f46b5a66SChristoph Hellwig case S_IFREG: 3162616d374eSAdam Borowski /* 3163616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3164616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3165616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3166616d374eSAdam Borowski */ 3167616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3168616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3169616d374eSAdam Borowski ret = -EPERM; 3170e441d54dSChris Mason goto out; 3171e441d54dSChris Mason } 31721e701a32SChris Mason 31731e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31741e701a32SChris Mason if (!range) { 31751e701a32SChris Mason ret = -ENOMEM; 31761e701a32SChris Mason goto out; 31771e701a32SChris Mason } 31781e701a32SChris Mason 31791e701a32SChris Mason if (argp) { 31801e701a32SChris Mason if (copy_from_user(range, argp, 31811e701a32SChris Mason sizeof(*range))) { 31821e701a32SChris Mason ret = -EFAULT; 31831e701a32SChris Mason kfree(range); 3184683be16eSDan Carpenter goto out; 31851e701a32SChris Mason } 31861e701a32SChris Mason /* compression requires us to start the IO */ 31871e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31881e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31891e701a32SChris Mason range->extent_thresh = (u32)-1; 31901e701a32SChris Mason } 31911e701a32SChris Mason } else { 31921e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31931e701a32SChris Mason range->len = (u64)-1; 31941e701a32SChris Mason } 3195496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31967c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31974cb5300bSChris Mason if (ret > 0) 31984cb5300bSChris Mason ret = 0; 31991e701a32SChris Mason kfree(range); 3200f46b5a66SChristoph Hellwig break; 32018929ecfaSYan, Zheng default: 32028929ecfaSYan, Zheng ret = -EINVAL; 3203f46b5a66SChristoph Hellwig } 3204e441d54dSChris Mason out: 320525122d15SIlya Dryomov mnt_drop_write_file(file); 3206e441d54dSChris Mason return ret; 3207f46b5a66SChristoph Hellwig } 3208f46b5a66SChristoph Hellwig 32092ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3210f46b5a66SChristoph Hellwig { 3211f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3212f46b5a66SChristoph Hellwig int ret; 3213f46b5a66SChristoph Hellwig 3214e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3215e441d54dSChris Mason return -EPERM; 3216e441d54dSChris Mason 3217c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3218e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3219c9e9f97bSIlya Dryomov 3220dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3221c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3222c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3223c9e9f97bSIlya Dryomov goto out; 3224c9e9f97bSIlya Dryomov } 3225f46b5a66SChristoph Hellwig 32265516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32272ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3228f46b5a66SChristoph Hellwig 322943d20761SAnand Jain if (!ret) 32300b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 323143d20761SAnand Jain 3232f46b5a66SChristoph Hellwig kfree(vol_args); 3233c9e9f97bSIlya Dryomov out: 3234c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3235f46b5a66SChristoph Hellwig return ret; 3236f46b5a66SChristoph Hellwig } 3237f46b5a66SChristoph Hellwig 32386b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3239f46b5a66SChristoph Hellwig { 32400b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32410b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32426b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3243f46b5a66SChristoph Hellwig int ret; 3244f46b5a66SChristoph Hellwig 3245e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3246e441d54dSChris Mason return -EPERM; 3247e441d54dSChris Mason 3248da24927bSMiao Xie ret = mnt_want_write_file(file); 3249da24927bSMiao Xie if (ret) 3250da24927bSMiao Xie return ret; 3251c146afadSYan Zheng 3252dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3253c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3254c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3255c47ca32dSDan Carpenter goto err_drop; 3256c9e9f97bSIlya Dryomov } 3257f46b5a66SChristoph Hellwig 3258748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3259fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3260fd4e994bSOmar Sandoval goto out; 3261fd4e994bSOmar Sandoval } 3262f46b5a66SChristoph Hellwig 3263c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3264183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3265183860f6SAnand Jain goto out; 3266183860f6SAnand Jain } 3267183860f6SAnand Jain 3268735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 32692ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 32706b526ed7SAnand Jain } else { 32716b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 32722ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 32736b526ed7SAnand Jain } 3274c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3275183860f6SAnand Jain 32766b526ed7SAnand Jain if (!ret) { 3277735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32780b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32796b526ed7SAnand Jain vol_args->devid); 32806b526ed7SAnand Jain else 32810b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32826b526ed7SAnand Jain vol_args->name); 32836b526ed7SAnand Jain } 3284183860f6SAnand Jain out: 3285183860f6SAnand Jain kfree(vol_args); 3286c47ca32dSDan Carpenter err_drop: 32874ac20c70SIlya Dryomov mnt_drop_write_file(file); 3288f46b5a66SChristoph Hellwig return ret; 3289f46b5a66SChristoph Hellwig } 3290f46b5a66SChristoph Hellwig 3291f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3292f46b5a66SChristoph Hellwig { 32930b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32940b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3295f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3296f46b5a66SChristoph Hellwig int ret; 3297f46b5a66SChristoph Hellwig 3298f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3299f46b5a66SChristoph Hellwig return -EPERM; 3300f46b5a66SChristoph Hellwig 3301f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3302f46b5a66SChristoph Hellwig if (ret) 3303f46b5a66SChristoph Hellwig return ret; 3304f46b5a66SChristoph Hellwig 3305c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3306f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 330758d7bbf8SDavid Sterba goto out_drop_write; 330858d7bbf8SDavid Sterba } 330958d7bbf8SDavid Sterba 331058d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 331158d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 331258d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3313f46b5a66SChristoph Hellwig goto out; 3314f46b5a66SChristoph Hellwig } 3315f46b5a66SChristoph Hellwig 331658d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 33172ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3318f46b5a66SChristoph Hellwig 3319f46b5a66SChristoph Hellwig if (!ret) 33200b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3321f46b5a66SChristoph Hellwig kfree(vol_args); 332258d7bbf8SDavid Sterba out: 3323c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 332458d7bbf8SDavid Sterba out_drop_write: 3325f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 332658d7bbf8SDavid Sterba 3327f46b5a66SChristoph Hellwig return ret; 3328f46b5a66SChristoph Hellwig } 3329f46b5a66SChristoph Hellwig 33302ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33312ff7e61eSJeff Mahoney void __user *arg) 3332475f6387SJan Schmidt { 3333027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3334475f6387SJan Schmidt struct btrfs_device *device; 33350b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3336137c5418SJohannes Thumshirn u64 flags_in; 3337027ed2f0SLi Zefan int ret = 0; 3338475f6387SJan Schmidt 3339137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3340137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3341137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3342137c5418SJohannes Thumshirn 3343137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3344137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3345027ed2f0SLi Zefan 3346d03262c7SDavid Sterba rcu_read_lock(); 3347027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3348475f6387SJan Schmidt 3349d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3350027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3351027ed2f0SLi Zefan fi_args->max_id = device->devid; 3352475f6387SJan Schmidt } 3353d03262c7SDavid Sterba rcu_read_unlock(); 3354475f6387SJan Schmidt 3355de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3356bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3357bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3358bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 335980a773fbSDavid Sterba 3360137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3361137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3362137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3363137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3364137c5418SJohannes Thumshirn } 3365137c5418SJohannes Thumshirn 33660fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33670fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33680fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33690fb408a5SJohannes Thumshirn } 33700fb408a5SJohannes Thumshirn 337149bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 337249bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 337349bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 337449bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 337549bac897SJohannes Thumshirn } 337649bac897SJohannes Thumshirn 3377027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3378027ed2f0SLi Zefan ret = -EFAULT; 3379475f6387SJan Schmidt 3380027ed2f0SLi Zefan kfree(fi_args); 3381027ed2f0SLi Zefan return ret; 3382475f6387SJan Schmidt } 3383475f6387SJan Schmidt 33842ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33852ff7e61eSJeff Mahoney void __user *arg) 3386475f6387SJan Schmidt { 3387475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3388475f6387SJan Schmidt struct btrfs_device *dev; 3389475f6387SJan Schmidt int ret = 0; 3390475f6387SJan Schmidt char *s_uuid = NULL; 3391475f6387SJan Schmidt 3392475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3393475f6387SJan Schmidt if (IS_ERR(di_args)) 3394475f6387SJan Schmidt return PTR_ERR(di_args); 3395475f6387SJan Schmidt 3396dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3397475f6387SJan Schmidt s_uuid = di_args->uuid; 3398475f6387SJan Schmidt 3399c5593ca3SDavid Sterba rcu_read_lock(); 3400e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3401b2598edfSAnand Jain NULL); 3402475f6387SJan Schmidt 3403475f6387SJan Schmidt if (!dev) { 3404475f6387SJan Schmidt ret = -ENODEV; 3405475f6387SJan Schmidt goto out; 3406475f6387SJan Schmidt } 3407475f6387SJan Schmidt 3408475f6387SJan Schmidt di_args->devid = dev->devid; 34097cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 34107cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3411475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3412a27202fbSJim Meyering if (dev->name) { 3413672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3414672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3415a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3416a27202fbSJim Meyering } else { 341799ba55adSStefan Behrens di_args->path[0] = '\0'; 3418a27202fbSJim Meyering } 3419475f6387SJan Schmidt 3420475f6387SJan Schmidt out: 3421c5593ca3SDavid Sterba rcu_read_unlock(); 3422475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3423475f6387SJan Schmidt ret = -EFAULT; 3424475f6387SJan Schmidt 3425475f6387SJan Schmidt kfree(di_args); 3426475f6387SJan Schmidt return ret; 3427475f6387SJan Schmidt } 3428475f6387SJan Schmidt 34296ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34306ef5ed0dSJosef Bacik { 3431496ad9aaSAl Viro struct inode *inode = file_inode(file); 34320b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34336ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34346ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34356ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34366ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34372a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34386ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34396ef5ed0dSJosef Bacik u64 objectid = 0; 34406ef5ed0dSJosef Bacik u64 dir_id; 34413c04ce01SMiao Xie int ret; 34426ef5ed0dSJosef Bacik 34436ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34446ef5ed0dSJosef Bacik return -EPERM; 34456ef5ed0dSJosef Bacik 34463c04ce01SMiao Xie ret = mnt_want_write_file(file); 34473c04ce01SMiao Xie if (ret) 34483c04ce01SMiao Xie return ret; 34493c04ce01SMiao Xie 34503c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34513c04ce01SMiao Xie ret = -EFAULT; 34523c04ce01SMiao Xie goto out; 34533c04ce01SMiao Xie } 34546ef5ed0dSJosef Bacik 34556ef5ed0dSJosef Bacik if (!objectid) 34561cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34576ef5ed0dSJosef Bacik 345856e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34593c04ce01SMiao Xie if (IS_ERR(new_root)) { 34603c04ce01SMiao Xie ret = PTR_ERR(new_root); 34613c04ce01SMiao Xie goto out; 34623c04ce01SMiao Xie } 34632a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34642a2b5d62SJosef Bacik ret = -ENOENT; 34652a2b5d62SJosef Bacik goto out_free; 34662a2b5d62SJosef Bacik } 34676ef5ed0dSJosef Bacik 34686ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34693c04ce01SMiao Xie if (!path) { 34703c04ce01SMiao Xie ret = -ENOMEM; 34712a2b5d62SJosef Bacik goto out_free; 34723c04ce01SMiao Xie } 34736ef5ed0dSJosef Bacik 34746ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 347598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34763c04ce01SMiao Xie ret = PTR_ERR(trans); 34772a2b5d62SJosef Bacik goto out_free; 34786ef5ed0dSJosef Bacik } 34796ef5ed0dSJosef Bacik 34800b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34810b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34826ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3483cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34842a2b5d62SJosef Bacik btrfs_release_path(path); 34853a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34860b246afaSJeff Mahoney btrfs_err(fs_info, 34875d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34883c04ce01SMiao Xie ret = -ENOENT; 34892a2b5d62SJosef Bacik goto out_free; 34906ef5ed0dSJosef Bacik } 34916ef5ed0dSJosef Bacik 34926ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34936ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34946ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34952a2b5d62SJosef Bacik btrfs_release_path(path); 34966ef5ed0dSJosef Bacik 34970b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34983a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34992a2b5d62SJosef Bacik out_free: 350000246528SJosef Bacik btrfs_put_root(new_root); 35012a2b5d62SJosef Bacik btrfs_free_path(path); 35023c04ce01SMiao Xie out: 35033c04ce01SMiao Xie mnt_drop_write_file(file); 35043c04ce01SMiao Xie return ret; 35056ef5ed0dSJosef Bacik } 35066ef5ed0dSJosef Bacik 3507c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3508bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3509bf5fc093SJosef Bacik { 351032da5386SDavid Sterba struct btrfs_block_group *block_group; 3511bf5fc093SJosef Bacik 3512bf5fc093SJosef Bacik space->total_bytes = 0; 3513bf5fc093SJosef Bacik space->used_bytes = 0; 3514bf5fc093SJosef Bacik space->flags = 0; 3515bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3516bf5fc093SJosef Bacik space->flags = block_group->flags; 3517b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3518bf38be65SDavid Sterba space->used_bytes += block_group->used; 3519bf5fc093SJosef Bacik } 3520bf5fc093SJosef Bacik } 3521bf5fc093SJosef Bacik 35222ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 35232ff7e61eSJeff Mahoney void __user *arg) 35241406e432SJosef Bacik { 35251406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35261406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35271406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35287fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 352913f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35301406e432SJosef Bacik struct btrfs_space_info *info; 3531315d8e98SColin Ian King static const u64 types[] = { 3532315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3533bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3534bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3535315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3536315d8e98SColin Ian King }; 3537bf5fc093SJosef Bacik int num_types = 4; 35387fde62bfSChris Mason int alloc_size; 35391406e432SJosef Bacik int ret = 0; 354051788b1bSDan Rosenberg u64 slot_count = 0; 3541bf5fc093SJosef Bacik int i, c; 35421406e432SJosef Bacik 35431406e432SJosef Bacik if (copy_from_user(&space_args, 35441406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35451406e432SJosef Bacik sizeof(space_args))) 35461406e432SJosef Bacik return -EFAULT; 35471406e432SJosef Bacik 3548bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3549bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3550bf5fc093SJosef Bacik 3551bf5fc093SJosef Bacik info = NULL; 355272804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3553bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3554bf5fc093SJosef Bacik info = tmp; 3555bf5fc093SJosef Bacik break; 3556bf5fc093SJosef Bacik } 3557bf5fc093SJosef Bacik } 35581406e432SJosef Bacik 3559bf5fc093SJosef Bacik if (!info) 3560bf5fc093SJosef Bacik continue; 3561bf5fc093SJosef Bacik 3562bf5fc093SJosef Bacik down_read(&info->groups_sem); 3563bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3564bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3565bf5fc093SJosef Bacik slot_count++; 3566bf5fc093SJosef Bacik } 3567bf5fc093SJosef Bacik up_read(&info->groups_sem); 3568bf5fc093SJosef Bacik } 3569bf5fc093SJosef Bacik 357036523e95SDavid Sterba /* 357136523e95SDavid Sterba * Global block reserve, exported as a space_info 357236523e95SDavid Sterba */ 357336523e95SDavid Sterba slot_count++; 357436523e95SDavid Sterba 35757fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35767fde62bfSChris Mason if (space_args.space_slots == 0) { 35777fde62bfSChris Mason space_args.total_spaces = slot_count; 35787fde62bfSChris Mason goto out; 35797fde62bfSChris Mason } 3580bf5fc093SJosef Bacik 358151788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3582bf5fc093SJosef Bacik 35837fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3584bf5fc093SJosef Bacik 35857fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35867fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35877fde62bfSChris Mason */ 358809cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35897fde62bfSChris Mason return -ENOMEM; 35907fde62bfSChris Mason 35917fde62bfSChris Mason space_args.total_spaces = 0; 35928d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35937fde62bfSChris Mason if (!dest) 35947fde62bfSChris Mason return -ENOMEM; 35957fde62bfSChris Mason dest_orig = dest; 35967fde62bfSChris Mason 35977fde62bfSChris Mason /* now we have a buffer to copy into */ 3598bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3599bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3600bf5fc093SJosef Bacik 360151788b1bSDan Rosenberg if (!slot_count) 360251788b1bSDan Rosenberg break; 360351788b1bSDan Rosenberg 3604bf5fc093SJosef Bacik info = NULL; 360572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3606bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3607bf5fc093SJosef Bacik info = tmp; 36087fde62bfSChris Mason break; 3609bf5fc093SJosef Bacik } 3610bf5fc093SJosef Bacik } 36117fde62bfSChris Mason 3612bf5fc093SJosef Bacik if (!info) 3613bf5fc093SJosef Bacik continue; 3614bf5fc093SJosef Bacik down_read(&info->groups_sem); 3615bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3616bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3617c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3618c065f5b1SSu Yue &space); 36197fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36201406e432SJosef Bacik dest++; 36211406e432SJosef Bacik space_args.total_spaces++; 362251788b1bSDan Rosenberg slot_count--; 36231406e432SJosef Bacik } 362451788b1bSDan Rosenberg if (!slot_count) 362551788b1bSDan Rosenberg break; 3626bf5fc093SJosef Bacik } 3627bf5fc093SJosef Bacik up_read(&info->groups_sem); 3628bf5fc093SJosef Bacik } 36291406e432SJosef Bacik 363036523e95SDavid Sterba /* 363136523e95SDavid Sterba * Add global block reserve 363236523e95SDavid Sterba */ 363336523e95SDavid Sterba if (slot_count) { 36340b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 363536523e95SDavid Sterba 363636523e95SDavid Sterba spin_lock(&block_rsv->lock); 363736523e95SDavid Sterba space.total_bytes = block_rsv->size; 363836523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 363936523e95SDavid Sterba spin_unlock(&block_rsv->lock); 364036523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 364136523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 364236523e95SDavid Sterba space_args.total_spaces++; 364336523e95SDavid Sterba } 364436523e95SDavid Sterba 36452eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36467fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36477fde62bfSChris Mason 36487fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36497fde62bfSChris Mason ret = -EFAULT; 36507fde62bfSChris Mason 36517fde62bfSChris Mason kfree(dest_orig); 36527fde62bfSChris Mason out: 36537fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36541406e432SJosef Bacik ret = -EFAULT; 36551406e432SJosef Bacik 36561406e432SJosef Bacik return ret; 36571406e432SJosef Bacik } 36581406e432SJosef Bacik 36599a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36609a8c28beSMiao Xie void __user *argp) 366146204592SSage Weil { 366246204592SSage Weil struct btrfs_trans_handle *trans; 366346204592SSage Weil u64 transid; 3664db5b493aSTsutomu Itoh int ret; 366546204592SSage Weil 3666d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3667ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3668ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 366998d5dc13STsutomu Itoh return PTR_ERR(trans); 3670ff7c1d33SMiao Xie 3671ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3672ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3673ff7c1d33SMiao Xie goto out; 3674ff7c1d33SMiao Xie } 367546204592SSage Weil transid = trans->transid; 36763a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36778b2b2d3cSTsutomu Itoh if (ret) { 36783a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3679db5b493aSTsutomu Itoh return ret; 36808b2b2d3cSTsutomu Itoh } 3681ff7c1d33SMiao Xie out: 368246204592SSage Weil if (argp) 368346204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 368446204592SSage Weil return -EFAULT; 368546204592SSage Weil return 0; 368646204592SSage Weil } 368746204592SSage Weil 36882ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36899a8c28beSMiao Xie void __user *argp) 369046204592SSage Weil { 369146204592SSage Weil u64 transid; 369246204592SSage Weil 369346204592SSage Weil if (argp) { 369446204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 369546204592SSage Weil return -EFAULT; 369646204592SSage Weil } else { 369746204592SSage Weil transid = 0; /* current trans */ 369846204592SSage Weil } 36992ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 370046204592SSage Weil } 370146204592SSage Weil 3702b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3703475f6387SJan Schmidt { 37040b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3705475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3706b8e95489SMiao Xie int ret; 3707475f6387SJan Schmidt 3708475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3709475f6387SJan Schmidt return -EPERM; 3710475f6387SJan Schmidt 3711475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3712475f6387SJan Schmidt if (IS_ERR(sa)) 3713475f6387SJan Schmidt return PTR_ERR(sa); 3714475f6387SJan Schmidt 3715b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3716b8e95489SMiao Xie ret = mnt_want_write_file(file); 3717b8e95489SMiao Xie if (ret) 3718b8e95489SMiao Xie goto out; 3719b8e95489SMiao Xie } 3720b8e95489SMiao Xie 37210b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 372263a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 372363a212abSStefan Behrens 0); 3724475f6387SJan Schmidt 37255afe6ce7SFilipe Manana /* 37265afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37275afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37285afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37295afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37305afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37315afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37325afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37335afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37345afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37355afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37365afe6ce7SFilipe Manana */ 37375afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3738475f6387SJan Schmidt ret = -EFAULT; 3739475f6387SJan Schmidt 3740b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3741b8e95489SMiao Xie mnt_drop_write_file(file); 3742b8e95489SMiao Xie out: 3743475f6387SJan Schmidt kfree(sa); 3744475f6387SJan Schmidt return ret; 3745475f6387SJan Schmidt } 3746475f6387SJan Schmidt 37472ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3748475f6387SJan Schmidt { 3749475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3750475f6387SJan Schmidt return -EPERM; 3751475f6387SJan Schmidt 37522ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3753475f6387SJan Schmidt } 3754475f6387SJan Schmidt 37552ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3756475f6387SJan Schmidt void __user *arg) 3757475f6387SJan Schmidt { 3758475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3759475f6387SJan Schmidt int ret; 3760475f6387SJan Schmidt 3761475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3762475f6387SJan Schmidt return -EPERM; 3763475f6387SJan Schmidt 3764475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3765475f6387SJan Schmidt if (IS_ERR(sa)) 3766475f6387SJan Schmidt return PTR_ERR(sa); 3767475f6387SJan Schmidt 37682ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3769475f6387SJan Schmidt 37704fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3771475f6387SJan Schmidt ret = -EFAULT; 3772475f6387SJan Schmidt 3773475f6387SJan Schmidt kfree(sa); 3774475f6387SJan Schmidt return ret; 3775475f6387SJan Schmidt } 3776475f6387SJan Schmidt 37772ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3778b27f7c0cSDavid Sterba void __user *arg) 3779c11d2c23SStefan Behrens { 3780c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3781c11d2c23SStefan Behrens int ret; 3782c11d2c23SStefan Behrens 3783c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3784c11d2c23SStefan Behrens if (IS_ERR(sa)) 3785c11d2c23SStefan Behrens return PTR_ERR(sa); 3786c11d2c23SStefan Behrens 3787b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3788b27f7c0cSDavid Sterba kfree(sa); 3789b27f7c0cSDavid Sterba return -EPERM; 3790b27f7c0cSDavid Sterba } 3791b27f7c0cSDavid Sterba 37922ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3793c11d2c23SStefan Behrens 3794eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3795c11d2c23SStefan Behrens ret = -EFAULT; 3796c11d2c23SStefan Behrens 3797c11d2c23SStefan Behrens kfree(sa); 3798c11d2c23SStefan Behrens return ret; 3799c11d2c23SStefan Behrens } 3800c11d2c23SStefan Behrens 38012ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 38022ff7e61eSJeff Mahoney void __user *arg) 38033f6bcfbdSStefan Behrens { 38043f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 38053f6bcfbdSStefan Behrens int ret; 38063f6bcfbdSStefan Behrens 38073f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 38083f6bcfbdSStefan Behrens return -EPERM; 38093f6bcfbdSStefan Behrens 38103f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 38113f6bcfbdSStefan Behrens if (IS_ERR(p)) 38123f6bcfbdSStefan Behrens return PTR_ERR(p); 38133f6bcfbdSStefan Behrens 38143f6bcfbdSStefan Behrens switch (p->cmd) { 38153f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3816bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3817adfa97cbSIlya Dryomov ret = -EROFS; 3818adfa97cbSIlya Dryomov goto out; 3819adfa97cbSIlya Dryomov } 3820c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3821e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38223f6bcfbdSStefan Behrens } else { 38232ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3824c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38253f6bcfbdSStefan Behrens } 38263f6bcfbdSStefan Behrens break; 38273f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38280b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38293f6bcfbdSStefan Behrens ret = 0; 38303f6bcfbdSStefan Behrens break; 38313f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 383217d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 383397282031SAnand Jain ret = 0; 38343f6bcfbdSStefan Behrens break; 38353f6bcfbdSStefan Behrens default: 38363f6bcfbdSStefan Behrens ret = -EINVAL; 38373f6bcfbdSStefan Behrens break; 38383f6bcfbdSStefan Behrens } 38393f6bcfbdSStefan Behrens 3840d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38413f6bcfbdSStefan Behrens ret = -EFAULT; 3842adfa97cbSIlya Dryomov out: 38433f6bcfbdSStefan Behrens kfree(p); 38443f6bcfbdSStefan Behrens return ret; 38453f6bcfbdSStefan Behrens } 38463f6bcfbdSStefan Behrens 3847d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3848d7728c96SJan Schmidt { 3849d7728c96SJan Schmidt int ret = 0; 3850d7728c96SJan Schmidt int i; 3851740c3d22SChris Mason u64 rel_ptr; 3852d7728c96SJan Schmidt int size; 3853806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3854d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3855d7728c96SJan Schmidt struct btrfs_path *path; 3856d7728c96SJan Schmidt 385782b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3858d7728c96SJan Schmidt return -EPERM; 3859d7728c96SJan Schmidt 3860d7728c96SJan Schmidt path = btrfs_alloc_path(); 3861d7728c96SJan Schmidt if (!path) { 3862d7728c96SJan Schmidt ret = -ENOMEM; 3863d7728c96SJan Schmidt goto out; 3864d7728c96SJan Schmidt } 3865d7728c96SJan Schmidt 3866d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3867d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3868d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3869d7728c96SJan Schmidt ipa = NULL; 3870d7728c96SJan Schmidt goto out; 3871d7728c96SJan Schmidt } 3872d7728c96SJan Schmidt 3873d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3874d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3875d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3876d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3877d7728c96SJan Schmidt ipath = NULL; 3878d7728c96SJan Schmidt goto out; 3879d7728c96SJan Schmidt } 3880d7728c96SJan Schmidt 3881d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3882d7728c96SJan Schmidt if (ret < 0) 3883d7728c96SJan Schmidt goto out; 3884d7728c96SJan Schmidt 3885d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3886745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3887745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3888740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3889d7728c96SJan Schmidt } 3890d7728c96SJan Schmidt 3891718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3892718dc5faSOmar Sandoval ipath->fspath, size); 3893d7728c96SJan Schmidt if (ret) { 3894d7728c96SJan Schmidt ret = -EFAULT; 3895d7728c96SJan Schmidt goto out; 3896d7728c96SJan Schmidt } 3897d7728c96SJan Schmidt 3898d7728c96SJan Schmidt out: 3899d7728c96SJan Schmidt btrfs_free_path(path); 3900d7728c96SJan Schmidt free_ipath(ipath); 3901d7728c96SJan Schmidt kfree(ipa); 3902d7728c96SJan Schmidt 3903d7728c96SJan Schmidt return ret; 3904d7728c96SJan Schmidt } 3905d7728c96SJan Schmidt 3906d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3907d7728c96SJan Schmidt { 3908d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3909d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3910d7728c96SJan Schmidt 3911d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3912d7728c96SJan Schmidt inodes->bytes_left -= c; 3913d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3914d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3915d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3916d7728c96SJan Schmidt inodes->elem_cnt += 3; 3917d7728c96SJan Schmidt } else { 3918d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3919d7728c96SJan Schmidt inodes->bytes_left = 0; 3920d7728c96SJan Schmidt inodes->elem_missed += 3; 3921d7728c96SJan Schmidt } 3922d7728c96SJan Schmidt 3923d7728c96SJan Schmidt return 0; 3924d7728c96SJan Schmidt } 3925d7728c96SJan Schmidt 39262ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3927d24a67b2SZygo Blaxell void __user *arg, int version) 3928d7728c96SJan Schmidt { 3929d7728c96SJan Schmidt int ret = 0; 3930d7728c96SJan Schmidt int size; 3931d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3932d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3933d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3934d24a67b2SZygo Blaxell bool ignore_offset; 3935d7728c96SJan Schmidt 3936d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3937d7728c96SJan Schmidt return -EPERM; 3938d7728c96SJan Schmidt 3939d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39407b9ea627SShailendra Verma if (IS_ERR(loi)) 39417b9ea627SShailendra Verma return PTR_ERR(loi); 3942d7728c96SJan Schmidt 3943d24a67b2SZygo Blaxell if (version == 1) { 3944d24a67b2SZygo Blaxell ignore_offset = false; 3945b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3946d24a67b2SZygo Blaxell } else { 3947d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3948d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3949d24a67b2SZygo Blaxell ret = -EINVAL; 3950d24a67b2SZygo Blaxell goto out_loi; 3951d24a67b2SZygo Blaxell } 3952d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3953d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3954d24a67b2SZygo Blaxell ret = -EINVAL; 3955d24a67b2SZygo Blaxell goto out_loi; 3956d24a67b2SZygo Blaxell } 3957d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3958b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3959d24a67b2SZygo Blaxell } 3960d24a67b2SZygo Blaxell 3961d7728c96SJan Schmidt path = btrfs_alloc_path(); 3962d7728c96SJan Schmidt if (!path) { 3963d7728c96SJan Schmidt ret = -ENOMEM; 3964d7728c96SJan Schmidt goto out; 3965d7728c96SJan Schmidt } 3966d7728c96SJan Schmidt 3967d7728c96SJan Schmidt inodes = init_data_container(size); 3968d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3969d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3970d7728c96SJan Schmidt inodes = NULL; 3971d7728c96SJan Schmidt goto out; 3972d7728c96SJan Schmidt } 3973d7728c96SJan Schmidt 39742ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3975d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3976df031f07SLiu Bo if (ret == -EINVAL) 3977d7728c96SJan Schmidt ret = -ENOENT; 3978d7728c96SJan Schmidt if (ret < 0) 3979d7728c96SJan Schmidt goto out; 3980d7728c96SJan Schmidt 3981718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3982718dc5faSOmar Sandoval size); 3983d7728c96SJan Schmidt if (ret) 3984d7728c96SJan Schmidt ret = -EFAULT; 3985d7728c96SJan Schmidt 3986d7728c96SJan Schmidt out: 3987d7728c96SJan Schmidt btrfs_free_path(path); 3988f54de068SDavid Sterba kvfree(inodes); 3989d24a67b2SZygo Blaxell out_loi: 3990d7728c96SJan Schmidt kfree(loi); 3991d7728c96SJan Schmidt 3992d7728c96SJan Schmidt return ret; 3993d7728c96SJan Schmidt } 3994d7728c96SJan Schmidt 3995008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3996c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3997c9e9f97bSIlya Dryomov { 3998c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3999c9e9f97bSIlya Dryomov 4000c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 4001c9e9f97bSIlya Dryomov 40023009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 4003837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 4004837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 4005837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 4006a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 4007a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 4008837d5b6eSIlya Dryomov 4009c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 4010c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 4011c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 401219a39dceSIlya Dryomov 401319a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 401419a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 401519a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 4016c9e9f97bSIlya Dryomov } 4017c9e9f97bSIlya Dryomov 40189ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4019c9e9f97bSIlya Dryomov { 4020496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4021c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4022c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4023c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4024ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4025c9e9f97bSIlya Dryomov int ret; 4026c9e9f97bSIlya Dryomov 4027c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4028c9e9f97bSIlya Dryomov return -EPERM; 4029c9e9f97bSIlya Dryomov 4030e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40319ba1f6e4SLiu Bo if (ret) 40329ba1f6e4SLiu Bo return ret; 40339ba1f6e4SLiu Bo 4034ed0fb78fSIlya Dryomov again: 4035c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4036c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4037ed0fb78fSIlya Dryomov need_unlock = true; 4038ed0fb78fSIlya Dryomov goto locked; 4039ed0fb78fSIlya Dryomov } 4040ed0fb78fSIlya Dryomov 4041ed0fb78fSIlya Dryomov /* 404201327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4043ed0fb78fSIlya Dryomov * (1) some other op is running 4044ed0fb78fSIlya Dryomov * (2) balance is running 4045ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4046ed0fb78fSIlya Dryomov */ 4047ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4048ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4049ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40503009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4051ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4052dccdb07bSDavid Sterba /* 4053dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4054dccdb07bSDavid Sterba * we'll reexamine the status again. 4055dccdb07bSDavid Sterba */ 4056ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4057ed0fb78fSIlya Dryomov 4058ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40593009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4060ed0fb78fSIlya Dryomov /* this is (3) */ 4061ed0fb78fSIlya Dryomov need_unlock = false; 4062ed0fb78fSIlya Dryomov goto locked; 4063ed0fb78fSIlya Dryomov } 4064ed0fb78fSIlya Dryomov 4065ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4066ed0fb78fSIlya Dryomov goto again; 4067ed0fb78fSIlya Dryomov } else { 4068ed0fb78fSIlya Dryomov /* this is (2) */ 4069ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4070ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4071ed0fb78fSIlya Dryomov goto out; 4072ed0fb78fSIlya Dryomov } 4073ed0fb78fSIlya Dryomov } else { 4074ed0fb78fSIlya Dryomov /* this is (1) */ 4075ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4076e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4077ed0fb78fSIlya Dryomov goto out; 4078ed0fb78fSIlya Dryomov } 4079ed0fb78fSIlya Dryomov 4080ed0fb78fSIlya Dryomov locked: 4081c9e9f97bSIlya Dryomov 4082c9e9f97bSIlya Dryomov if (arg) { 4083c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4084c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4085c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4086ed0fb78fSIlya Dryomov goto out_unlock; 4087c9e9f97bSIlya Dryomov } 4088de322263SIlya Dryomov 4089de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4090de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4091de322263SIlya Dryomov ret = -ENOTCONN; 4092de322263SIlya Dryomov goto out_bargs; 4093de322263SIlya Dryomov } 4094de322263SIlya Dryomov 4095de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4096de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4097de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4098de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4099de322263SIlya Dryomov 4100de322263SIlya Dryomov goto do_balance; 4101de322263SIlya Dryomov } 4102c9e9f97bSIlya Dryomov } else { 4103c9e9f97bSIlya Dryomov bargs = NULL; 4104c9e9f97bSIlya Dryomov } 4105c9e9f97bSIlya Dryomov 4106ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4107837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4108837d5b6eSIlya Dryomov goto out_bargs; 4109837d5b6eSIlya Dryomov } 4110837d5b6eSIlya Dryomov 41118d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4112c9e9f97bSIlya Dryomov if (!bctl) { 4113c9e9f97bSIlya Dryomov ret = -ENOMEM; 4114c9e9f97bSIlya Dryomov goto out_bargs; 4115c9e9f97bSIlya Dryomov } 4116c9e9f97bSIlya Dryomov 4117c9e9f97bSIlya Dryomov if (arg) { 4118c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4119c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4120c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4121c9e9f97bSIlya Dryomov 4122c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4123f43ffb60SIlya Dryomov } else { 4124f43ffb60SIlya Dryomov /* balance everything - no filters */ 4125f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4126c9e9f97bSIlya Dryomov } 4127c9e9f97bSIlya Dryomov 41288eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41298eb93459SDavid Sterba ret = -EINVAL; 41300f89abf5SChristian Engelmayer goto out_bctl; 41318eb93459SDavid Sterba } 41328eb93459SDavid Sterba 4133de322263SIlya Dryomov do_balance: 4134c9e9f97bSIlya Dryomov /* 4135c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4136c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4137c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4138c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4139c9e9f97bSIlya Dryomov */ 4140ed0fb78fSIlya Dryomov need_unlock = false; 4141ed0fb78fSIlya Dryomov 41426fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41430f89abf5SChristian Engelmayer bctl = NULL; 4144ed0fb78fSIlya Dryomov 4145d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4146c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4147c9e9f97bSIlya Dryomov ret = -EFAULT; 4148c9e9f97bSIlya Dryomov } 4149c9e9f97bSIlya Dryomov 41500f89abf5SChristian Engelmayer out_bctl: 41510f89abf5SChristian Engelmayer kfree(bctl); 4152c9e9f97bSIlya Dryomov out_bargs: 4153c9e9f97bSIlya Dryomov kfree(bargs); 4154ed0fb78fSIlya Dryomov out_unlock: 4155c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4156ed0fb78fSIlya Dryomov if (need_unlock) 4157c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4158ed0fb78fSIlya Dryomov out: 4159e54bfa31SLiu Bo mnt_drop_write_file(file); 4160c9e9f97bSIlya Dryomov return ret; 4161c9e9f97bSIlya Dryomov } 4162c9e9f97bSIlya Dryomov 41632ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4164837d5b6eSIlya Dryomov { 4165837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4166837d5b6eSIlya Dryomov return -EPERM; 4167837d5b6eSIlya Dryomov 4168837d5b6eSIlya Dryomov switch (cmd) { 4169837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41700b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4171a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41720b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4173837d5b6eSIlya Dryomov } 4174837d5b6eSIlya Dryomov 4175837d5b6eSIlya Dryomov return -EINVAL; 4176837d5b6eSIlya Dryomov } 4177837d5b6eSIlya Dryomov 41782ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 417919a39dceSIlya Dryomov void __user *arg) 418019a39dceSIlya Dryomov { 418119a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 418219a39dceSIlya Dryomov int ret = 0; 418319a39dceSIlya Dryomov 418419a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 418519a39dceSIlya Dryomov return -EPERM; 418619a39dceSIlya Dryomov 418719a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 418819a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 418919a39dceSIlya Dryomov ret = -ENOTCONN; 419019a39dceSIlya Dryomov goto out; 419119a39dceSIlya Dryomov } 419219a39dceSIlya Dryomov 41938d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 419419a39dceSIlya Dryomov if (!bargs) { 419519a39dceSIlya Dryomov ret = -ENOMEM; 419619a39dceSIlya Dryomov goto out; 419719a39dceSIlya Dryomov } 419819a39dceSIlya Dryomov 4199008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 420019a39dceSIlya Dryomov 420119a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 420219a39dceSIlya Dryomov ret = -EFAULT; 420319a39dceSIlya Dryomov 420419a39dceSIlya Dryomov kfree(bargs); 420519a39dceSIlya Dryomov out: 420619a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 420719a39dceSIlya Dryomov return ret; 420819a39dceSIlya Dryomov } 420919a39dceSIlya Dryomov 4210905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 42115d13a37bSArne Jansen { 42120b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42130b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42145d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 42155d13a37bSArne Jansen int ret; 42165d13a37bSArne Jansen 42175d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42185d13a37bSArne Jansen return -EPERM; 42195d13a37bSArne Jansen 4220905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4221905b0ddaSMiao Xie if (ret) 4222905b0ddaSMiao Xie return ret; 42235d13a37bSArne Jansen 42245d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4225905b0ddaSMiao Xie if (IS_ERR(sa)) { 4226905b0ddaSMiao Xie ret = PTR_ERR(sa); 4227905b0ddaSMiao Xie goto drop_write; 4228905b0ddaSMiao Xie } 42295d13a37bSArne Jansen 42300b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42315d13a37bSArne Jansen 42325d13a37bSArne Jansen switch (sa->cmd) { 42335d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4234340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42355d13a37bSArne Jansen break; 42365d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4237340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42385d13a37bSArne Jansen break; 42395d13a37bSArne Jansen default: 42405d13a37bSArne Jansen ret = -EINVAL; 42415d13a37bSArne Jansen break; 42425d13a37bSArne Jansen } 42435d13a37bSArne Jansen 42445d13a37bSArne Jansen kfree(sa); 42450b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4246905b0ddaSMiao Xie drop_write: 4247905b0ddaSMiao Xie mnt_drop_write_file(file); 42485d13a37bSArne Jansen return ret; 42495d13a37bSArne Jansen } 42505d13a37bSArne Jansen 4251905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42525d13a37bSArne Jansen { 42530b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42540b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42550b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42565d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42575d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42585d13a37bSArne Jansen int ret; 42595d13a37bSArne Jansen int err; 42605d13a37bSArne Jansen 42615d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42625d13a37bSArne Jansen return -EPERM; 42635d13a37bSArne Jansen 4264905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4265905b0ddaSMiao Xie if (ret) 4266905b0ddaSMiao Xie return ret; 42675d13a37bSArne Jansen 42685d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4269905b0ddaSMiao Xie if (IS_ERR(sa)) { 4270905b0ddaSMiao Xie ret = PTR_ERR(sa); 4271905b0ddaSMiao Xie goto drop_write; 4272905b0ddaSMiao Xie } 42735d13a37bSArne Jansen 42745d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42755d13a37bSArne Jansen if (IS_ERR(trans)) { 42765d13a37bSArne Jansen ret = PTR_ERR(trans); 42775d13a37bSArne Jansen goto out; 42785d13a37bSArne Jansen } 42795d13a37bSArne Jansen 42805d13a37bSArne Jansen if (sa->assign) { 42819f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42825d13a37bSArne Jansen } else { 428339616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42845d13a37bSArne Jansen } 42855d13a37bSArne Jansen 4286e082f563SQu Wenruo /* update qgroup status and info */ 4287280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4288e082f563SQu Wenruo if (err < 0) 42890b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4290ad8403dfSAnand Jain "failed to update qgroup status and info"); 42913a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42925d13a37bSArne Jansen if (err && !ret) 42935d13a37bSArne Jansen ret = err; 42945d13a37bSArne Jansen 42955d13a37bSArne Jansen out: 42965d13a37bSArne Jansen kfree(sa); 4297905b0ddaSMiao Xie drop_write: 4298905b0ddaSMiao Xie mnt_drop_write_file(file); 42995d13a37bSArne Jansen return ret; 43005d13a37bSArne Jansen } 43015d13a37bSArne Jansen 4302905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 43035d13a37bSArne Jansen { 43040b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43050b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43065d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 43075d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43085d13a37bSArne Jansen int ret; 43095d13a37bSArne Jansen int err; 43105d13a37bSArne Jansen 43115d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43125d13a37bSArne Jansen return -EPERM; 43135d13a37bSArne Jansen 4314905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4315905b0ddaSMiao Xie if (ret) 4316905b0ddaSMiao Xie return ret; 43175d13a37bSArne Jansen 43185d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4319905b0ddaSMiao Xie if (IS_ERR(sa)) { 4320905b0ddaSMiao Xie ret = PTR_ERR(sa); 4321905b0ddaSMiao Xie goto drop_write; 4322905b0ddaSMiao Xie } 43235d13a37bSArne Jansen 4324d86e56cfSMiao Xie if (!sa->qgroupid) { 4325d86e56cfSMiao Xie ret = -EINVAL; 4326d86e56cfSMiao Xie goto out; 4327d86e56cfSMiao Xie } 4328d86e56cfSMiao Xie 43295d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43305d13a37bSArne Jansen if (IS_ERR(trans)) { 43315d13a37bSArne Jansen ret = PTR_ERR(trans); 43325d13a37bSArne Jansen goto out; 43335d13a37bSArne Jansen } 43345d13a37bSArne Jansen 43355d13a37bSArne Jansen if (sa->create) { 433649a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43375d13a37bSArne Jansen } else { 43383efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43395d13a37bSArne Jansen } 43405d13a37bSArne Jansen 43413a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43425d13a37bSArne Jansen if (err && !ret) 43435d13a37bSArne Jansen ret = err; 43445d13a37bSArne Jansen 43455d13a37bSArne Jansen out: 43465d13a37bSArne Jansen kfree(sa); 4347905b0ddaSMiao Xie drop_write: 4348905b0ddaSMiao Xie mnt_drop_write_file(file); 43495d13a37bSArne Jansen return ret; 43505d13a37bSArne Jansen } 43515d13a37bSArne Jansen 4352905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43535d13a37bSArne Jansen { 43540b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43550b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43565d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43575d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43585d13a37bSArne Jansen int ret; 43595d13a37bSArne Jansen int err; 43605d13a37bSArne Jansen u64 qgroupid; 43615d13a37bSArne Jansen 43625d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43635d13a37bSArne Jansen return -EPERM; 43645d13a37bSArne Jansen 4365905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4366905b0ddaSMiao Xie if (ret) 4367905b0ddaSMiao Xie return ret; 43685d13a37bSArne Jansen 43695d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4370905b0ddaSMiao Xie if (IS_ERR(sa)) { 4371905b0ddaSMiao Xie ret = PTR_ERR(sa); 4372905b0ddaSMiao Xie goto drop_write; 4373905b0ddaSMiao Xie } 43745d13a37bSArne Jansen 43755d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43765d13a37bSArne Jansen if (IS_ERR(trans)) { 43775d13a37bSArne Jansen ret = PTR_ERR(trans); 43785d13a37bSArne Jansen goto out; 43795d13a37bSArne Jansen } 43805d13a37bSArne Jansen 43815d13a37bSArne Jansen qgroupid = sa->qgroupid; 43825d13a37bSArne Jansen if (!qgroupid) { 43835d13a37bSArne Jansen /* take the current subvol as qgroup */ 43845d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43855d13a37bSArne Jansen } 43865d13a37bSArne Jansen 4387f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43885d13a37bSArne Jansen 43893a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43905d13a37bSArne Jansen if (err && !ret) 43915d13a37bSArne Jansen ret = err; 43925d13a37bSArne Jansen 43935d13a37bSArne Jansen out: 43945d13a37bSArne Jansen kfree(sa); 4395905b0ddaSMiao Xie drop_write: 4396905b0ddaSMiao Xie mnt_drop_write_file(file); 43975d13a37bSArne Jansen return ret; 43985d13a37bSArne Jansen } 43995d13a37bSArne Jansen 44002f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 44012f232036SJan Schmidt { 44020b246afaSJeff Mahoney struct inode *inode = file_inode(file); 44030b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44042f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44052f232036SJan Schmidt int ret; 44062f232036SJan Schmidt 44072f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44082f232036SJan Schmidt return -EPERM; 44092f232036SJan Schmidt 44102f232036SJan Schmidt ret = mnt_want_write_file(file); 44112f232036SJan Schmidt if (ret) 44122f232036SJan Schmidt return ret; 44132f232036SJan Schmidt 44142f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 44152f232036SJan Schmidt if (IS_ERR(qsa)) { 44162f232036SJan Schmidt ret = PTR_ERR(qsa); 44172f232036SJan Schmidt goto drop_write; 44182f232036SJan Schmidt } 44192f232036SJan Schmidt 44202f232036SJan Schmidt if (qsa->flags) { 44212f232036SJan Schmidt ret = -EINVAL; 44222f232036SJan Schmidt goto out; 44232f232036SJan Schmidt } 44242f232036SJan Schmidt 44250b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44262f232036SJan Schmidt 44272f232036SJan Schmidt out: 44282f232036SJan Schmidt kfree(qsa); 44292f232036SJan Schmidt drop_write: 44302f232036SJan Schmidt mnt_drop_write_file(file); 44312f232036SJan Schmidt return ret; 44322f232036SJan Schmidt } 44332f232036SJan Schmidt 4434b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4435b929c1d8SMarcos Paulo de Souza void __user *arg) 44362f232036SJan Schmidt { 44372f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44382f232036SJan Schmidt int ret = 0; 44392f232036SJan Schmidt 44402f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44412f232036SJan Schmidt return -EPERM; 44422f232036SJan Schmidt 44438d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44442f232036SJan Schmidt if (!qsa) 44452f232036SJan Schmidt return -ENOMEM; 44462f232036SJan Schmidt 44470b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44482f232036SJan Schmidt qsa->flags = 1; 44490b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44502f232036SJan Schmidt } 44512f232036SJan Schmidt 44522f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44532f232036SJan Schmidt ret = -EFAULT; 44542f232036SJan Schmidt 44552f232036SJan Schmidt kfree(qsa); 44562f232036SJan Schmidt return ret; 44572f232036SJan Schmidt } 44582f232036SJan Schmidt 4459b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4460b929c1d8SMarcos Paulo de Souza void __user *arg) 446157254b6eSJan Schmidt { 446257254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 446357254b6eSJan Schmidt return -EPERM; 446457254b6eSJan Schmidt 44650b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 446657254b6eSJan Schmidt } 446757254b6eSJan Schmidt 4468abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4469abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44708ea05e3aSAlexander Block { 4471496ad9aaSAl Viro struct inode *inode = file_inode(file); 44720b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44738ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44748ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44758ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 447695582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44778ea05e3aSAlexander Block int ret = 0; 4478dd5f9615SStefan Behrens int received_uuid_changed; 44798ea05e3aSAlexander Block 4480bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4481bd60ea0fSDavid Sterba return -EPERM; 4482bd60ea0fSDavid Sterba 44838ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44848ea05e3aSAlexander Block if (ret < 0) 44858ea05e3aSAlexander Block return ret; 44868ea05e3aSAlexander Block 44870b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44888ea05e3aSAlexander Block 44894a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44908ea05e3aSAlexander Block ret = -EINVAL; 44918ea05e3aSAlexander Block goto out; 44928ea05e3aSAlexander Block } 44938ea05e3aSAlexander Block 44948ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44958ea05e3aSAlexander Block ret = -EROFS; 44968ea05e3aSAlexander Block goto out; 44978ea05e3aSAlexander Block } 44988ea05e3aSAlexander Block 4499dd5f9615SStefan Behrens /* 4500dd5f9615SStefan Behrens * 1 - root item 4501dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4502dd5f9615SStefan Behrens */ 4503dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 45048ea05e3aSAlexander Block if (IS_ERR(trans)) { 45058ea05e3aSAlexander Block ret = PTR_ERR(trans); 45068ea05e3aSAlexander Block trans = NULL; 45078ea05e3aSAlexander Block goto out; 45088ea05e3aSAlexander Block } 45098ea05e3aSAlexander Block 45108ea05e3aSAlexander Block sa->rtransid = trans->transid; 45118ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 45128ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 45138ea05e3aSAlexander Block 4514dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4515dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4516dd5f9615SStefan Behrens if (received_uuid_changed && 4517d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4518d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4519dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4520dd5f9615SStefan Behrens root->root_key.objectid); 4521d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4522d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4523d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4524d87ff758SNikolay Borisov goto out; 4525d87ff758SNikolay Borisov } 4526d87ff758SNikolay Borisov } 45278ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45288ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45298ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45303cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45313cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45323cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45333cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45348ea05e3aSAlexander Block 45350b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45368ea05e3aSAlexander Block &root->root_key, &root->root_item); 45378ea05e3aSAlexander Block if (ret < 0) { 45383a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45398ea05e3aSAlexander Block goto out; 4540dd5f9615SStefan Behrens } 4541dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4542cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4543dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4544dd5f9615SStefan Behrens root->root_key.objectid); 4545dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 454666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4547efd38150SNikolay Borisov btrfs_end_transaction(trans); 4548dd5f9615SStefan Behrens goto out; 4549dd5f9615SStefan Behrens } 4550dd5f9615SStefan Behrens } 45513a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4552abccd00fSHugo Mills out: 45530b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4554abccd00fSHugo Mills mnt_drop_write_file(file); 4555abccd00fSHugo Mills return ret; 4556abccd00fSHugo Mills } 4557abccd00fSHugo Mills 4558abccd00fSHugo Mills #ifdef CONFIG_64BIT 4559abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4560abccd00fSHugo Mills void __user *arg) 4561abccd00fSHugo Mills { 4562abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4563abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4564abccd00fSHugo Mills int ret = 0; 4565abccd00fSHugo Mills 4566abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45677b9ea627SShailendra Verma if (IS_ERR(args32)) 45687b9ea627SShailendra Verma return PTR_ERR(args32); 4569abccd00fSHugo Mills 45708d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 457184dbeb87SDan Carpenter if (!args64) { 457284dbeb87SDan Carpenter ret = -ENOMEM; 4573abccd00fSHugo Mills goto out; 4574abccd00fSHugo Mills } 4575abccd00fSHugo Mills 4576abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4577abccd00fSHugo Mills args64->stransid = args32->stransid; 4578abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4579abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4580abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4581abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4582abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4583abccd00fSHugo Mills args64->flags = args32->flags; 4584abccd00fSHugo Mills 4585abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4586abccd00fSHugo Mills if (ret) 4587abccd00fSHugo Mills goto out; 4588abccd00fSHugo Mills 4589abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4590abccd00fSHugo Mills args32->stransid = args64->stransid; 4591abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4592abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4593abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4594abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4595abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4596abccd00fSHugo Mills args32->flags = args64->flags; 4597abccd00fSHugo Mills 4598abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4599abccd00fSHugo Mills if (ret) 4600abccd00fSHugo Mills ret = -EFAULT; 4601abccd00fSHugo Mills 4602abccd00fSHugo Mills out: 4603abccd00fSHugo Mills kfree(args32); 4604abccd00fSHugo Mills kfree(args64); 4605abccd00fSHugo Mills return ret; 4606abccd00fSHugo Mills } 4607abccd00fSHugo Mills #endif 4608abccd00fSHugo Mills 4609abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4610abccd00fSHugo Mills void __user *arg) 4611abccd00fSHugo Mills { 4612abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4613abccd00fSHugo Mills int ret = 0; 4614abccd00fSHugo Mills 4615abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 46167b9ea627SShailendra Verma if (IS_ERR(sa)) 46177b9ea627SShailendra Verma return PTR_ERR(sa); 4618abccd00fSHugo Mills 4619abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4620abccd00fSHugo Mills 4621abccd00fSHugo Mills if (ret) 4622abccd00fSHugo Mills goto out; 4623abccd00fSHugo Mills 46248ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46258ea05e3aSAlexander Block if (ret) 46268ea05e3aSAlexander Block ret = -EFAULT; 46278ea05e3aSAlexander Block 46288ea05e3aSAlexander Block out: 46298ea05e3aSAlexander Block kfree(sa); 46308ea05e3aSAlexander Block return ret; 46318ea05e3aSAlexander Block } 46328ea05e3aSAlexander Block 4633b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4634b929c1d8SMarcos Paulo de Souza void __user *arg) 4635867ab667Sjeff.liu { 4636a1b83ac5SAnand Jain size_t len; 4637867ab667Sjeff.liu int ret; 4638a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4639a1b83ac5SAnand Jain 46400b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46410b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46420b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4643a1b83ac5SAnand Jain 4644a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4645867ab667Sjeff.liu 4646867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46470b246afaSJeff Mahoney btrfs_warn(fs_info, 46480b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46490b246afaSJeff Mahoney --len); 4650867ab667Sjeff.liu } 4651867ab667Sjeff.liu 4652867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4653867ab667Sjeff.liu 4654867ab667Sjeff.liu return ret ? -EFAULT : 0; 4655867ab667Sjeff.liu } 4656867ab667Sjeff.liu 4657a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4658a8bfd4abSjeff.liu { 46590b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46600b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46610b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46620b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4663a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4664a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4665a8bfd4abSjeff.liu int ret; 4666a8bfd4abSjeff.liu 4667a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4668a8bfd4abSjeff.liu return -EPERM; 4669a8bfd4abSjeff.liu 4670a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4671a8bfd4abSjeff.liu return -EFAULT; 4672a8bfd4abSjeff.liu 4673a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46740b246afaSJeff Mahoney btrfs_err(fs_info, 46755d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4676a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4677a8bfd4abSjeff.liu return -EINVAL; 4678a8bfd4abSjeff.liu } 4679a8bfd4abSjeff.liu 4680a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4681a8bfd4abSjeff.liu if (ret) 4682a8bfd4abSjeff.liu return ret; 4683a8bfd4abSjeff.liu 4684a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4685a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4686a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4687a8bfd4abSjeff.liu goto out_unlock; 4688a8bfd4abSjeff.liu } 4689a8bfd4abSjeff.liu 46900b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4691a8bfd4abSjeff.liu strcpy(super_block->label, label); 46920b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46933a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4694a8bfd4abSjeff.liu 4695a8bfd4abSjeff.liu out_unlock: 4696a8bfd4abSjeff.liu mnt_drop_write_file(file); 4697a8bfd4abSjeff.liu return ret; 4698a8bfd4abSjeff.liu } 4699a8bfd4abSjeff.liu 47002eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 47012eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 47022eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 47032eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 47042eaa055fSJeff Mahoney 4705d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 47062eaa055fSJeff Mahoney { 47074d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 47082eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 47092eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 47102eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 47112eaa055fSJeff Mahoney }; 47122eaa055fSJeff Mahoney 47132eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47142eaa055fSJeff Mahoney return -EFAULT; 47152eaa055fSJeff Mahoney 47162eaa055fSJeff Mahoney return 0; 47172eaa055fSJeff Mahoney } 47182eaa055fSJeff Mahoney 4719b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4720b929c1d8SMarcos Paulo de Souza void __user *arg) 47212eaa055fSJeff Mahoney { 47220b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47232eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47242eaa055fSJeff Mahoney 47252eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47262eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47272eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47282eaa055fSJeff Mahoney 47292eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47302eaa055fSJeff Mahoney return -EFAULT; 47312eaa055fSJeff Mahoney 47322eaa055fSJeff Mahoney return 0; 47332eaa055fSJeff Mahoney } 47342eaa055fSJeff Mahoney 47352ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47363b02a68aSJeff Mahoney enum btrfs_feature_set set, 47372eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47382eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47392eaa055fSJeff Mahoney { 4740f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47413b02a68aSJeff Mahoney char *names; 47422eaa055fSJeff Mahoney u64 disallowed, unsupported; 47432eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47442eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47452eaa055fSJeff Mahoney 47462eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47472eaa055fSJeff Mahoney if (unsupported) { 47483b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47493b02a68aSJeff Mahoney if (names) { 47500b246afaSJeff Mahoney btrfs_warn(fs_info, 47513b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47523b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47533b02a68aSJeff Mahoney kfree(names); 47543b02a68aSJeff Mahoney } else 47550b246afaSJeff Mahoney btrfs_warn(fs_info, 47562eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47572eaa055fSJeff Mahoney type, unsupported); 47582eaa055fSJeff Mahoney return -EOPNOTSUPP; 47592eaa055fSJeff Mahoney } 47602eaa055fSJeff Mahoney 47612eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47622eaa055fSJeff Mahoney if (disallowed) { 47633b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47643b02a68aSJeff Mahoney if (names) { 47650b246afaSJeff Mahoney btrfs_warn(fs_info, 47663b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47673b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47683b02a68aSJeff Mahoney kfree(names); 47693b02a68aSJeff Mahoney } else 47700b246afaSJeff Mahoney btrfs_warn(fs_info, 47712eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47722eaa055fSJeff Mahoney type, disallowed); 47732eaa055fSJeff Mahoney return -EPERM; 47742eaa055fSJeff Mahoney } 47752eaa055fSJeff Mahoney 47762eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47772eaa055fSJeff Mahoney if (disallowed) { 47783b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47793b02a68aSJeff Mahoney if (names) { 47800b246afaSJeff Mahoney btrfs_warn(fs_info, 47813b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47823b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47833b02a68aSJeff Mahoney kfree(names); 47843b02a68aSJeff Mahoney } else 47850b246afaSJeff Mahoney btrfs_warn(fs_info, 47862eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47872eaa055fSJeff Mahoney type, disallowed); 47882eaa055fSJeff Mahoney return -EPERM; 47892eaa055fSJeff Mahoney } 47902eaa055fSJeff Mahoney 47912eaa055fSJeff Mahoney return 0; 47922eaa055fSJeff Mahoney } 47932eaa055fSJeff Mahoney 47942ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47952ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47962eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47972eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47982eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47992eaa055fSJeff Mahoney 48002eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 48012eaa055fSJeff Mahoney { 48020b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48030b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48040b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48050b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 48062eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 48072eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 48082eaa055fSJeff Mahoney u64 newflags; 48092eaa055fSJeff Mahoney int ret; 48102eaa055fSJeff Mahoney 48112eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 48122eaa055fSJeff Mahoney return -EPERM; 48132eaa055fSJeff Mahoney 48142eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 48152eaa055fSJeff Mahoney return -EFAULT; 48162eaa055fSJeff Mahoney 48172eaa055fSJeff Mahoney /* Nothing to do */ 48182eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48192eaa055fSJeff Mahoney !flags[0].incompat_flags) 48202eaa055fSJeff Mahoney return 0; 48212eaa055fSJeff Mahoney 48222ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 48232eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48242eaa055fSJeff Mahoney if (ret) 48252eaa055fSJeff Mahoney return ret; 48262eaa055fSJeff Mahoney 48272ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48282eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48292eaa055fSJeff Mahoney if (ret) 48302eaa055fSJeff Mahoney return ret; 48312eaa055fSJeff Mahoney 48322ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48332eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48342eaa055fSJeff Mahoney if (ret) 48352eaa055fSJeff Mahoney return ret; 48362eaa055fSJeff Mahoney 48377ab19625SDavid Sterba ret = mnt_want_write_file(file); 48387ab19625SDavid Sterba if (ret) 48397ab19625SDavid Sterba return ret; 48407ab19625SDavid Sterba 48418051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48427ab19625SDavid Sterba if (IS_ERR(trans)) { 48437ab19625SDavid Sterba ret = PTR_ERR(trans); 48447ab19625SDavid Sterba goto out_drop_write; 48457ab19625SDavid Sterba } 48462eaa055fSJeff Mahoney 48470b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48482eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48492eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48502eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48512eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48522eaa055fSJeff Mahoney 48532eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48542eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48552eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48562eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48572eaa055fSJeff Mahoney 48582eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48592eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48602eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48612eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48620b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48632eaa055fSJeff Mahoney 48643a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48657ab19625SDavid Sterba out_drop_write: 48667ab19625SDavid Sterba mnt_drop_write_file(file); 48677ab19625SDavid Sterba 48687ab19625SDavid Sterba return ret; 48692eaa055fSJeff Mahoney } 48702eaa055fSJeff Mahoney 48712351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48722351f431SJosef Bacik { 48732351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48742351f431SJosef Bacik int ret; 48752351f431SJosef Bacik 48762351f431SJosef Bacik if (compat) { 48772351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48782351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48792351f431SJosef Bacik 48802351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48812351f431SJosef Bacik if (ret) 48822351f431SJosef Bacik return -EFAULT; 48832351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48842351f431SJosef Bacik if (!arg) 48852351f431SJosef Bacik return -ENOMEM; 48862351f431SJosef Bacik arg->send_fd = args32.send_fd; 48872351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48882351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48892351f431SJosef Bacik arg->parent_root = args32.parent_root; 48902351f431SJosef Bacik arg->flags = args32.flags; 48912351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48922351f431SJosef Bacik sizeof(args32.reserved)); 48932351f431SJosef Bacik #else 48942351f431SJosef Bacik return -ENOTTY; 48952351f431SJosef Bacik #endif 48962351f431SJosef Bacik } else { 48972351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48982351f431SJosef Bacik if (IS_ERR(arg)) 48992351f431SJosef Bacik return PTR_ERR(arg); 49002351f431SJosef Bacik } 49012351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 49022351f431SJosef Bacik kfree(arg); 49032351f431SJosef Bacik return ret; 49042351f431SJosef Bacik } 49052351f431SJosef Bacik 4906f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4907f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4908f46b5a66SChristoph Hellwig { 49090b246afaSJeff Mahoney struct inode *inode = file_inode(file); 49100b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 49110b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 49124bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4913f46b5a66SChristoph Hellwig 4914f46b5a66SChristoph Hellwig switch (cmd) { 49156cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 49166cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 49176cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 49186cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 49196cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49206cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 492140cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4922b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 492340cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 492440cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4925f7039b1dSLi Dongyang case FITRIM: 4926b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4927f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4928fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4929fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4930fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49313de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4932fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49336f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49346f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 493576dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4936949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4937949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4938949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49390caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49400caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49410caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49420caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49436ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49446ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4945f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49461e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49471e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49481e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4949f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4950198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4951f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49522ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4953f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4954da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49556b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49566b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4957475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49582ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4959475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49602ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4961f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49629ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4963ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4964ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4965cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4966cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4967ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4968ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4969d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4970d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4971d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4972d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4973d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4974d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49751406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49762ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49779b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49789b199859SFilipe David Borba Manana int ret; 49799b199859SFilipe David Borba Manana 49809db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 49819b199859SFilipe David Borba Manana if (ret) 49829b199859SFilipe David Borba Manana return ret; 49830b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49842fad4e83SDavid Sterba /* 49852fad4e83SDavid Sterba * The transaction thread may want to do more work, 498601327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49872fad4e83SDavid Sterba * processing uncleaned subvols. 49882fad4e83SDavid Sterba */ 49890b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49909b199859SFilipe David Borba Manana return ret; 49919b199859SFilipe David Borba Manana } 499246204592SSage Weil case BTRFS_IOC_START_SYNC: 49939a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 499446204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49952ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4996475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4997b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4998475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49992ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 5000475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 50012ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 5002c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 50039ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 5004837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 50052ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 500619a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 50072ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 50088ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 50098ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 5010abccd00fSHugo Mills #ifdef CONFIG_64BIT 5011abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 5012abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 5013abccd00fSHugo Mills #endif 501431db9f7cSAlexander Block case BTRFS_IOC_SEND: 50152351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 50162351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50172351f431SJosef Bacik case BTRFS_IOC_SEND_32: 50182351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 50192351f431SJosef Bacik #endif 5020c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 50212ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 50225d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5023905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50245d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5025905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50265d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5027905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50285d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5029905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50302f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50312f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50322f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5033b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 503457254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5035b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50363f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50372ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50382eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5039d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50402eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5041b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50422eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50432eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5044e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5045e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5046025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5047025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5048b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5049b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 505042e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 505142e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 505223d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 505323d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5054f46b5a66SChristoph Hellwig } 5055f46b5a66SChristoph Hellwig 5056f46b5a66SChristoph Hellwig return -ENOTTY; 5057f46b5a66SChristoph Hellwig } 50584c63c245SLuke Dashjr 50594c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50604c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50614c63c245SLuke Dashjr { 50622a362249SJeff Mahoney /* 50632a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50642a362249SJeff Mahoney * handling is necessary. 50652a362249SJeff Mahoney */ 50664c63c245SLuke Dashjr switch (cmd) { 50674c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 50684c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 50694c63c245SLuke Dashjr break; 50704c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 50714c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 50724c63c245SLuke Dashjr break; 50734c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50744c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50754c63c245SLuke Dashjr break; 50764c63c245SLuke Dashjr } 50774c63c245SLuke Dashjr 50784c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50794c63c245SLuke Dashjr } 50804c63c245SLuke Dashjr #endif 5081