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 /* 531*1cb3dc3fSNaohiro Aota * btrfs_trim_block_group() depends on space cache, which is not 532*1cb3dc3fSNaohiro Aota * available in zoned filesystem. So, disallow fitrim on a zoned 533*1cb3dc3fSNaohiro Aota * filesystem for now. 534*1cb3dc3fSNaohiro Aota */ 535*1cb3dc3fSNaohiro Aota if (btrfs_is_zoned(fs_info)) 536*1cb3dc3fSNaohiro Aota return -EOPNOTSUPP; 537*1cb3dc3fSNaohiro Aota 538*1cb3dc3fSNaohiro 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) { 193809cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 19396f72c7e2SArne Jansen ret = -EINVAL; 1940c47ca32dSDan Carpenter goto free_args; 19416f72c7e2SArne Jansen } 19426f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19436f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19446f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1945c47ca32dSDan Carpenter goto free_args; 19466f72c7e2SArne Jansen } 19476f72c7e2SArne Jansen } 194875eaa0e2SSage Weil 19495d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19505d54c67eSNikolay Borisov subvol, readonly, inherit); 1951c47ca32dSDan Carpenter if (ret) 1952c47ca32dSDan Carpenter goto free_inherit; 1953c47ca32dSDan Carpenter free_inherit: 19546f72c7e2SArne Jansen kfree(inherit); 1955c47ca32dSDan Carpenter free_args: 1956c47ca32dSDan Carpenter kfree(vol_args); 1957f46b5a66SChristoph Hellwig return ret; 1958f46b5a66SChristoph Hellwig } 1959f46b5a66SChristoph Hellwig 19600caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19610caa102dSLi Zefan void __user *arg) 19620caa102dSLi Zefan { 1963496ad9aaSAl Viro struct inode *inode = file_inode(file); 19640b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19650caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19660caa102dSLi Zefan int ret = 0; 19670caa102dSLi Zefan u64 flags = 0; 19680caa102dSLi Zefan 19694a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19700caa102dSLi Zefan return -EINVAL; 19710caa102dSLi Zefan 19720b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19730caa102dSLi Zefan if (btrfs_root_readonly(root)) 19740caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19750b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19760caa102dSLi Zefan 19770caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19780caa102dSLi Zefan ret = -EFAULT; 19790caa102dSLi Zefan 19800caa102dSLi Zefan return ret; 19810caa102dSLi Zefan } 19820caa102dSLi Zefan 19830caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19840caa102dSLi Zefan void __user *arg) 19850caa102dSLi Zefan { 1986496ad9aaSAl Viro struct inode *inode = file_inode(file); 19870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19880caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19890caa102dSLi Zefan struct btrfs_trans_handle *trans; 19900caa102dSLi Zefan u64 root_flags; 19910caa102dSLi Zefan u64 flags; 19920caa102dSLi Zefan int ret = 0; 19930caa102dSLi Zefan 1994bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1995bd60ea0fSDavid Sterba return -EPERM; 1996bd60ea0fSDavid Sterba 1997b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1998b9ca0664SLiu Bo if (ret) 1999b9ca0664SLiu Bo goto out; 20000caa102dSLi Zefan 20014a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 2002b9ca0664SLiu Bo ret = -EINVAL; 2003b9ca0664SLiu Bo goto out_drop_write; 2004b9ca0664SLiu Bo } 20050caa102dSLi Zefan 2006b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 2007b9ca0664SLiu Bo ret = -EFAULT; 2008b9ca0664SLiu Bo goto out_drop_write; 2009b9ca0664SLiu Bo } 20100caa102dSLi Zefan 2011b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2012b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2013b9ca0664SLiu Bo goto out_drop_write; 2014b9ca0664SLiu Bo } 20150caa102dSLi Zefan 20160b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20170caa102dSLi Zefan 20180caa102dSLi Zefan /* nothing to do */ 20190caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2020b9ca0664SLiu Bo goto out_drop_sem; 20210caa102dSLi Zefan 20220caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20232c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20240caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20250caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20262c686537SDavid Sterba } else { 20272c686537SDavid Sterba /* 20282c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20292c686537SDavid Sterba * send 20302c686537SDavid Sterba */ 20312c686537SDavid Sterba spin_lock(&root->root_item_lock); 20322c686537SDavid Sterba if (root->send_in_progress == 0) { 20330caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20340caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20352c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20362c686537SDavid Sterba } else { 20372c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20380b246afaSJeff Mahoney btrfs_warn(fs_info, 20392c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20402c686537SDavid Sterba root->root_key.objectid); 20412c686537SDavid Sterba ret = -EPERM; 20422c686537SDavid Sterba goto out_drop_sem; 20432c686537SDavid Sterba } 20442c686537SDavid Sterba } 20450caa102dSLi Zefan 20460caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20470caa102dSLi Zefan if (IS_ERR(trans)) { 20480caa102dSLi Zefan ret = PTR_ERR(trans); 20490caa102dSLi Zefan goto out_reset; 20500caa102dSLi Zefan } 20510caa102dSLi Zefan 20520b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20530caa102dSLi Zefan &root->root_key, &root->root_item); 20549417ebc8SNikolay Borisov if (ret < 0) { 20559417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20569417ebc8SNikolay Borisov goto out_reset; 20579417ebc8SNikolay Borisov } 20580caa102dSLi Zefan 20599417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20609417ebc8SNikolay Borisov 20610caa102dSLi Zefan out_reset: 20620caa102dSLi Zefan if (ret) 20630caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2064b9ca0664SLiu Bo out_drop_sem: 20650b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2066b9ca0664SLiu Bo out_drop_write: 2067b9ca0664SLiu Bo mnt_drop_write_file(file); 2068b9ca0664SLiu Bo out: 20690caa102dSLi Zefan return ret; 20700caa102dSLi Zefan } 20710caa102dSLi Zefan 2072ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2073ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2074ac8e9819SChris Mason { 2075abc6e134SChris Mason struct btrfs_key test; 2076abc6e134SChris Mason int ret; 2077abc6e134SChris Mason 2078abc6e134SChris Mason test.objectid = sk->min_objectid; 2079abc6e134SChris Mason test.type = sk->min_type; 2080abc6e134SChris Mason test.offset = sk->min_offset; 2081abc6e134SChris Mason 2082abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2083abc6e134SChris Mason if (ret < 0) 2084ac8e9819SChris Mason return 0; 2085abc6e134SChris Mason 2086abc6e134SChris Mason test.objectid = sk->max_objectid; 2087abc6e134SChris Mason test.type = sk->max_type; 2088abc6e134SChris Mason test.offset = sk->max_offset; 2089abc6e134SChris Mason 2090abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2091abc6e134SChris Mason if (ret > 0) 2092ac8e9819SChris Mason return 0; 2093ac8e9819SChris Mason return 1; 2094ac8e9819SChris Mason } 2095ac8e9819SChris Mason 2096df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2097ac8e9819SChris Mason struct btrfs_key *key, 2098ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20999b6e817dSGerhard Heift size_t *buf_size, 2100ba346b35SGerhard Heift char __user *ubuf, 2101ac8e9819SChris Mason unsigned long *sk_offset, 2102ac8e9819SChris Mason int *num_found) 2103ac8e9819SChris Mason { 2104ac8e9819SChris Mason u64 found_transid; 2105ac8e9819SChris Mason struct extent_buffer *leaf; 2106ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2107dd81d459SNaohiro Aota struct btrfs_key test; 2108ac8e9819SChris Mason unsigned long item_off; 2109ac8e9819SChris Mason unsigned long item_len; 2110ac8e9819SChris Mason int nritems; 2111ac8e9819SChris Mason int i; 2112ac8e9819SChris Mason int slot; 2113ac8e9819SChris Mason int ret = 0; 2114ac8e9819SChris Mason 2115ac8e9819SChris Mason leaf = path->nodes[0]; 2116ac8e9819SChris Mason slot = path->slots[0]; 2117ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2118ac8e9819SChris Mason 2119ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2120ac8e9819SChris Mason i = nritems; 2121ac8e9819SChris Mason goto advance_key; 2122ac8e9819SChris Mason } 2123ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2124ac8e9819SChris Mason 2125ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2126ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2127ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2128ac8e9819SChris Mason 212903b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 213003b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 213103b71c6cSGabriel de Perthuis continue; 213203b71c6cSGabriel de Perthuis 21339b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21348f5f6178SGerhard Heift if (*num_found) { 2135ac8e9819SChris Mason ret = 1; 21368f5f6178SGerhard Heift goto out; 21378f5f6178SGerhard Heift } 21388f5f6178SGerhard Heift 21398f5f6178SGerhard Heift /* 21408f5f6178SGerhard Heift * return one empty item back for v1, which does not 21418f5f6178SGerhard Heift * handle -EOVERFLOW 21428f5f6178SGerhard Heift */ 21438f5f6178SGerhard Heift 21449b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2145ac8e9819SChris Mason item_len = 0; 21468f5f6178SGerhard Heift ret = -EOVERFLOW; 21478f5f6178SGerhard Heift } 2148ac8e9819SChris Mason 21499b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2150ac8e9819SChris Mason ret = 1; 215125c9bc2eSGerhard Heift goto out; 2152ac8e9819SChris Mason } 2153ac8e9819SChris Mason 2154ac8e9819SChris Mason sh.objectid = key->objectid; 2155ac8e9819SChris Mason sh.offset = key->offset; 2156ac8e9819SChris Mason sh.type = key->type; 2157ac8e9819SChris Mason sh.len = item_len; 2158ac8e9819SChris Mason sh.transid = found_transid; 2159ac8e9819SChris Mason 2160a48b73ecSJosef Bacik /* 2161a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2162a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2163a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2164a48b73ecSJosef Bacik * properly this next time through 2165a48b73ecSJosef Bacik */ 2166a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2167a48b73ecSJosef Bacik ret = 0; 2168ba346b35SGerhard Heift goto out; 2169ba346b35SGerhard Heift } 2170ba346b35SGerhard Heift 2171ac8e9819SChris Mason *sk_offset += sizeof(sh); 2172ac8e9819SChris Mason 2173ac8e9819SChris Mason if (item_len) { 2174ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2175a48b73ecSJosef Bacik /* 2176a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2177a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2178a48b73ecSJosef Bacik */ 2179a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2180ba346b35SGerhard Heift item_off, item_len)) { 2181a48b73ecSJosef Bacik ret = 0; 2182a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2183ba346b35SGerhard Heift goto out; 2184ba346b35SGerhard Heift } 2185ba346b35SGerhard Heift 2186ac8e9819SChris Mason *sk_offset += item_len; 2187ac8e9819SChris Mason } 2188e2156867SHugo Mills (*num_found)++; 2189ac8e9819SChris Mason 21908f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21918f5f6178SGerhard Heift goto out; 21928f5f6178SGerhard Heift 219325c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 219425c9bc2eSGerhard Heift ret = 1; 219525c9bc2eSGerhard Heift goto out; 219625c9bc2eSGerhard Heift } 2197ac8e9819SChris Mason } 2198ac8e9819SChris Mason advance_key: 2199ac8e9819SChris Mason ret = 0; 2200dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2201dd81d459SNaohiro Aota test.type = sk->max_type; 2202dd81d459SNaohiro Aota test.offset = sk->max_offset; 2203dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2204dd81d459SNaohiro Aota ret = 1; 2205dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2206abc6e134SChris Mason key->offset++; 2207dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2208abc6e134SChris Mason key->offset = 0; 2209abc6e134SChris Mason key->type++; 2210dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2211abc6e134SChris Mason key->offset = 0; 2212abc6e134SChris Mason key->type = 0; 2213abc6e134SChris Mason key->objectid++; 2214abc6e134SChris Mason } else 2215abc6e134SChris Mason ret = 1; 221625c9bc2eSGerhard Heift out: 2217ba346b35SGerhard Heift /* 2218ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2219ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2220ba346b35SGerhard Heift * * all items were found 2221ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2222ba346b35SGerhard Heift * leaf 2223ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2224ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2225ba346b35SGerhard Heift */ 2226ac8e9819SChris Mason return ret; 2227ac8e9819SChris Mason } 2228ac8e9819SChris Mason 2229ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 223012544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22319b6e817dSGerhard Heift size_t *buf_size, 2232ba346b35SGerhard Heift char __user *ubuf) 2233ac8e9819SChris Mason { 22340b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2235ac8e9819SChris Mason struct btrfs_root *root; 2236ac8e9819SChris Mason struct btrfs_key key; 2237ac8e9819SChris Mason struct btrfs_path *path; 2238ac8e9819SChris Mason int ret; 2239ac8e9819SChris Mason int num_found = 0; 2240ac8e9819SChris Mason unsigned long sk_offset = 0; 2241ac8e9819SChris Mason 22429b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22439b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 224412544442SGerhard Heift return -EOVERFLOW; 22459b6e817dSGerhard Heift } 224612544442SGerhard Heift 2247ac8e9819SChris Mason path = btrfs_alloc_path(); 2248ac8e9819SChris Mason if (!path) 2249ac8e9819SChris Mason return -ENOMEM; 2250ac8e9819SChris Mason 2251ac8e9819SChris Mason if (sk->tree_id == 0) { 2252ac8e9819SChris Mason /* search the root of the inode that was passed */ 225300246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2254ac8e9819SChris Mason } else { 225556e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2256ac8e9819SChris Mason if (IS_ERR(root)) { 2257ac8e9819SChris Mason btrfs_free_path(path); 2258ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2259ac8e9819SChris Mason } 2260ac8e9819SChris Mason } 2261ac8e9819SChris Mason 2262ac8e9819SChris Mason key.objectid = sk->min_objectid; 2263ac8e9819SChris Mason key.type = sk->min_type; 2264ac8e9819SChris Mason key.offset = sk->min_offset; 2265ac8e9819SChris Mason 2266ac8e9819SChris Mason while (1) { 22671c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22681c78544eSFilipe Manana *buf_size - sk_offset); 2269a48b73ecSJosef Bacik if (ret) 2270a48b73ecSJosef Bacik break; 2271a48b73ecSJosef Bacik 22726174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2273ac8e9819SChris Mason if (ret != 0) { 2274ac8e9819SChris Mason if (ret > 0) 2275ac8e9819SChris Mason ret = 0; 2276ac8e9819SChris Mason goto err; 2277ac8e9819SChris Mason } 2278df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2279ac8e9819SChris Mason &sk_offset, &num_found); 2280b3b4aa74SDavid Sterba btrfs_release_path(path); 228125c9bc2eSGerhard Heift if (ret) 2282ac8e9819SChris Mason break; 2283ac8e9819SChris Mason 2284ac8e9819SChris Mason } 22858f5f6178SGerhard Heift if (ret > 0) 2286ac8e9819SChris Mason ret = 0; 2287ac8e9819SChris Mason err: 2288ac8e9819SChris Mason sk->nr_items = num_found; 228900246528SJosef Bacik btrfs_put_root(root); 2290ac8e9819SChris Mason btrfs_free_path(path); 2291ac8e9819SChris Mason return ret; 2292ac8e9819SChris Mason } 2293ac8e9819SChris Mason 2294ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2295ac8e9819SChris Mason void __user *argp) 2296ac8e9819SChris Mason { 2297ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2298ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2299ac8e9819SChris Mason struct inode *inode; 2300ac8e9819SChris Mason int ret; 23019b6e817dSGerhard Heift size_t buf_size; 2302ac8e9819SChris Mason 2303ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2304ac8e9819SChris Mason return -EPERM; 2305ac8e9819SChris Mason 2306ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2307ac8e9819SChris Mason 2308ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2309ba346b35SGerhard Heift return -EFAULT; 2310ba346b35SGerhard Heift 2311ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2312ac8e9819SChris Mason 2313496ad9aaSAl Viro inode = file_inode(file); 2314ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23158f5f6178SGerhard Heift 23168f5f6178SGerhard Heift /* 23178f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23188f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23198f5f6178SGerhard Heift */ 23208f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23218f5f6178SGerhard Heift ret = 0; 23228f5f6178SGerhard Heift 2323ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2324ac8e9819SChris Mason ret = -EFAULT; 2325ac8e9819SChris Mason return ret; 2326ac8e9819SChris Mason } 2327ac8e9819SChris Mason 2328cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2329cc68a8a5SGerhard Heift void __user *argp) 2330cc68a8a5SGerhard Heift { 2331cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2332cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2333cc68a8a5SGerhard Heift struct inode *inode; 2334cc68a8a5SGerhard Heift int ret; 2335cc68a8a5SGerhard Heift size_t buf_size; 2336ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2337cc68a8a5SGerhard Heift 2338cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2339cc68a8a5SGerhard Heift return -EPERM; 2340cc68a8a5SGerhard Heift 2341cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2342cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2343cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2344cc68a8a5SGerhard Heift return -EFAULT; 2345cc68a8a5SGerhard Heift 2346cc68a8a5SGerhard Heift buf_size = args.buf_size; 2347cc68a8a5SGerhard Heift 2348cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2349cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2350cc68a8a5SGerhard Heift buf_size = buf_limit; 2351cc68a8a5SGerhard Heift 2352cc68a8a5SGerhard Heift inode = file_inode(file); 2353cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2354718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2355cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2356cc68a8a5SGerhard Heift ret = -EFAULT; 2357cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2358cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2359cc68a8a5SGerhard Heift ret = -EFAULT; 2360cc68a8a5SGerhard Heift 236176dda93cSYan, Zheng return ret; 236276dda93cSYan, Zheng } 236376dda93cSYan, Zheng 236498d377a0STARUISI Hiroaki /* 2365ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2366ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 236798d377a0STARUISI Hiroaki */ 236898d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 236998d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 237098d377a0STARUISI Hiroaki { 237198d377a0STARUISI Hiroaki struct btrfs_root *root; 237298d377a0STARUISI Hiroaki struct btrfs_key key; 2373ac8e9819SChris Mason char *ptr; 237498d377a0STARUISI Hiroaki int ret = -1; 237598d377a0STARUISI Hiroaki int slot; 237698d377a0STARUISI Hiroaki int len; 237798d377a0STARUISI Hiroaki int total_len = 0; 237898d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 237998d377a0STARUISI Hiroaki struct extent_buffer *l; 238098d377a0STARUISI Hiroaki struct btrfs_path *path; 238198d377a0STARUISI Hiroaki 238298d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 238398d377a0STARUISI Hiroaki name[0]='\0'; 238498d377a0STARUISI Hiroaki return 0; 238598d377a0STARUISI Hiroaki } 238698d377a0STARUISI Hiroaki 238798d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 238898d377a0STARUISI Hiroaki if (!path) 238998d377a0STARUISI Hiroaki return -ENOMEM; 239098d377a0STARUISI Hiroaki 2391c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 239298d377a0STARUISI Hiroaki 239356e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 239498d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2395ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 239688234012SJosef Bacik root = NULL; 239788234012SJosef Bacik goto out; 239888234012SJosef Bacik } 239998d377a0STARUISI Hiroaki 240098d377a0STARUISI Hiroaki key.objectid = dirid; 240198d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 24028ad6fcabSChris Mason key.offset = (u64)-1; 240398d377a0STARUISI Hiroaki 240498d377a0STARUISI Hiroaki while (1) { 240598d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 240698d377a0STARUISI Hiroaki if (ret < 0) 240798d377a0STARUISI Hiroaki goto out; 240818674c6cSFilipe David Borba Manana else if (ret > 0) { 240918674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 241018674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 241118674c6cSFilipe David Borba Manana if (ret < 0) 241218674c6cSFilipe David Borba Manana goto out; 241318674c6cSFilipe David Borba Manana else if (ret > 0) { 2414ac8e9819SChris Mason ret = -ENOENT; 241598d377a0STARUISI Hiroaki goto out; 2416ac8e9819SChris Mason } 241718674c6cSFilipe David Borba Manana } 241818674c6cSFilipe David Borba Manana 241918674c6cSFilipe David Borba Manana l = path->nodes[0]; 242018674c6cSFilipe David Borba Manana slot = path->slots[0]; 242118674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 242298d377a0STARUISI Hiroaki 242398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 242498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 242598d377a0STARUISI Hiroaki ptr -= len + 1; 242698d377a0STARUISI Hiroaki total_len += len + 1; 2427a696cf35SFilipe David Borba Manana if (ptr < name) { 2428a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 242998d377a0STARUISI Hiroaki goto out; 2430a696cf35SFilipe David Borba Manana } 243198d377a0STARUISI Hiroaki 243298d377a0STARUISI Hiroaki *(ptr + len) = '/'; 243398d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 243498d377a0STARUISI Hiroaki 243598d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 243698d377a0STARUISI Hiroaki break; 243798d377a0STARUISI Hiroaki 2438b3b4aa74SDavid Sterba btrfs_release_path(path); 243998d377a0STARUISI Hiroaki key.objectid = key.offset; 24408ad6fcabSChris Mason key.offset = (u64)-1; 244198d377a0STARUISI Hiroaki dirid = key.objectid; 244298d377a0STARUISI Hiroaki } 244377906a50SLi Zefan memmove(name, ptr, total_len); 244498d377a0STARUISI Hiroaki name[total_len] = '\0'; 244598d377a0STARUISI Hiroaki ret = 0; 244698d377a0STARUISI Hiroaki out: 244700246528SJosef Bacik btrfs_put_root(root); 244898d377a0STARUISI Hiroaki btrfs_free_path(path); 2449ac8e9819SChris Mason return ret; 2450ac8e9819SChris Mason } 2451ac8e9819SChris Mason 245223d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 245323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 245423d0b79dSTomohiro Misono { 245523d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 245623d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 245723d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 245823d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 245923d0b79dSTomohiro Misono u64 dirid = args->dirid; 246023d0b79dSTomohiro Misono unsigned long item_off; 246123d0b79dSTomohiro Misono unsigned long item_len; 246223d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 246323d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2464b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 246523d0b79dSTomohiro Misono struct btrfs_path *path; 246623d0b79dSTomohiro Misono struct btrfs_key key, key2; 246723d0b79dSTomohiro Misono struct extent_buffer *leaf; 246823d0b79dSTomohiro Misono struct inode *temp_inode; 246923d0b79dSTomohiro Misono char *ptr; 247023d0b79dSTomohiro Misono int slot; 247123d0b79dSTomohiro Misono int len; 247223d0b79dSTomohiro Misono int total_len = 0; 247323d0b79dSTomohiro Misono int ret; 247423d0b79dSTomohiro Misono 247523d0b79dSTomohiro Misono path = btrfs_alloc_path(); 247623d0b79dSTomohiro Misono if (!path) 247723d0b79dSTomohiro Misono return -ENOMEM; 247823d0b79dSTomohiro Misono 247923d0b79dSTomohiro Misono /* 248023d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 248123d0b79dSTomohiro Misono * construct the path in from the bottom up. 248223d0b79dSTomohiro Misono */ 248323d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 248423d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 248523d0b79dSTomohiro Misono 248656e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 248723d0b79dSTomohiro Misono if (IS_ERR(root)) { 248823d0b79dSTomohiro Misono ret = PTR_ERR(root); 248923d0b79dSTomohiro Misono goto out; 249023d0b79dSTomohiro Misono } 249123d0b79dSTomohiro Misono 249223d0b79dSTomohiro Misono key.objectid = dirid; 249323d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 249423d0b79dSTomohiro Misono key.offset = (u64)-1; 249523d0b79dSTomohiro Misono while (1) { 249623d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 249723d0b79dSTomohiro Misono if (ret < 0) { 2498b8a49ae1SJosef Bacik goto out_put; 249923d0b79dSTomohiro Misono } else if (ret > 0) { 250023d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 250123d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 250223d0b79dSTomohiro Misono if (ret < 0) { 2503b8a49ae1SJosef Bacik goto out_put; 250423d0b79dSTomohiro Misono } else if (ret > 0) { 250523d0b79dSTomohiro Misono ret = -ENOENT; 2506b8a49ae1SJosef Bacik goto out_put; 250723d0b79dSTomohiro Misono } 250823d0b79dSTomohiro Misono } 250923d0b79dSTomohiro Misono 251023d0b79dSTomohiro Misono leaf = path->nodes[0]; 251123d0b79dSTomohiro Misono slot = path->slots[0]; 251223d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 251323d0b79dSTomohiro Misono 251423d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 251523d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 251623d0b79dSTomohiro Misono ptr -= len + 1; 251723d0b79dSTomohiro Misono total_len += len + 1; 251823d0b79dSTomohiro Misono if (ptr < args->path) { 251923d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2520b8a49ae1SJosef Bacik goto out_put; 252123d0b79dSTomohiro Misono } 252223d0b79dSTomohiro Misono 252323d0b79dSTomohiro Misono *(ptr + len) = '/'; 252423d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 252523d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 252623d0b79dSTomohiro Misono 252723d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 252823d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 252923d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 253023d0b79dSTomohiro Misono if (ret < 0) { 2531b8a49ae1SJosef Bacik goto out_put; 253223d0b79dSTomohiro Misono } else if (ret > 0) { 253323d0b79dSTomohiro Misono ret = -ENOENT; 2534b8a49ae1SJosef Bacik goto out_put; 253523d0b79dSTomohiro Misono } 253623d0b79dSTomohiro Misono 253723d0b79dSTomohiro Misono leaf = path->nodes[0]; 253823d0b79dSTomohiro Misono slot = path->slots[0]; 253923d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 254023d0b79dSTomohiro Misono if (key2.objectid != dirid) { 254123d0b79dSTomohiro Misono ret = -ENOENT; 2542b8a49ae1SJosef Bacik goto out_put; 254323d0b79dSTomohiro Misono } 254423d0b79dSTomohiro Misono 25450202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25463ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25473ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2548b8a49ae1SJosef Bacik goto out_put; 25493ca57bd6SMisono Tomohiro } 255023d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 255123d0b79dSTomohiro Misono iput(temp_inode); 255223d0b79dSTomohiro Misono if (ret) { 255323d0b79dSTomohiro Misono ret = -EACCES; 2554b8a49ae1SJosef Bacik goto out_put; 255523d0b79dSTomohiro Misono } 255623d0b79dSTomohiro Misono 255723d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 255823d0b79dSTomohiro Misono break; 255923d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 256023d0b79dSTomohiro Misono ret = -EACCES; 2561b8a49ae1SJosef Bacik goto out_put; 256223d0b79dSTomohiro Misono } 256323d0b79dSTomohiro Misono 256423d0b79dSTomohiro Misono btrfs_release_path(path); 256523d0b79dSTomohiro Misono key.objectid = key.offset; 256623d0b79dSTomohiro Misono key.offset = (u64)-1; 256723d0b79dSTomohiro Misono dirid = key.objectid; 256823d0b79dSTomohiro Misono } 256923d0b79dSTomohiro Misono 257023d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 257123d0b79dSTomohiro Misono args->path[total_len] = '\0'; 257200246528SJosef Bacik btrfs_put_root(root); 2573b8a49ae1SJosef Bacik root = NULL; 257423d0b79dSTomohiro Misono btrfs_release_path(path); 257523d0b79dSTomohiro Misono } 257623d0b79dSTomohiro Misono 257723d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 257823d0b79dSTomohiro Misono key.objectid = treeid; 257923d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 258023d0b79dSTomohiro Misono key.offset = args->treeid; 2581b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 258223d0b79dSTomohiro Misono if (ret < 0) { 258323d0b79dSTomohiro Misono goto out; 258423d0b79dSTomohiro Misono } else if (ret > 0) { 258523d0b79dSTomohiro Misono ret = -ENOENT; 258623d0b79dSTomohiro Misono goto out; 258723d0b79dSTomohiro Misono } 258823d0b79dSTomohiro Misono 258923d0b79dSTomohiro Misono leaf = path->nodes[0]; 259023d0b79dSTomohiro Misono slot = path->slots[0]; 259123d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 259223d0b79dSTomohiro Misono 259323d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 259423d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 259523d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 259623d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 259723d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 259823d0b79dSTomohiro Misono ret = -EINVAL; 259923d0b79dSTomohiro Misono goto out; 260023d0b79dSTomohiro Misono } 260123d0b79dSTomohiro Misono 260223d0b79dSTomohiro Misono /* Copy subvolume's name */ 260323d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 260423d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 260523d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 260623d0b79dSTomohiro Misono args->name[item_len] = 0; 260723d0b79dSTomohiro Misono 2608b8a49ae1SJosef Bacik out_put: 260900246528SJosef Bacik btrfs_put_root(root); 261023d0b79dSTomohiro Misono out: 261123d0b79dSTomohiro Misono btrfs_free_path(path); 261223d0b79dSTomohiro Misono return ret; 261323d0b79dSTomohiro Misono } 261423d0b79dSTomohiro Misono 2615ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2616ac8e9819SChris Mason void __user *argp) 2617ac8e9819SChris Mason { 2618ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2619ac8e9819SChris Mason struct inode *inode; 262001b810b8SDavid Sterba int ret = 0; 2621ac8e9819SChris Mason 26222354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26232354d08fSJulia Lawall if (IS_ERR(args)) 26242354d08fSJulia Lawall return PTR_ERR(args); 2625c2b96929SDan Carpenter 2626496ad9aaSAl Viro inode = file_inode(file); 2627ac8e9819SChris Mason 262801b810b8SDavid Sterba /* 262901b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 263001b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 263101b810b8SDavid Sterba */ 26321b53ac4dSChris Mason if (args->treeid == 0) 26331b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26341b53ac4dSChris Mason 263501b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 263601b810b8SDavid Sterba args->name[0] = 0; 263701b810b8SDavid Sterba goto out; 263801b810b8SDavid Sterba } 263901b810b8SDavid Sterba 264001b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 264101b810b8SDavid Sterba ret = -EPERM; 264201b810b8SDavid Sterba goto out; 264301b810b8SDavid Sterba } 264401b810b8SDavid Sterba 2645ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2646ac8e9819SChris Mason args->treeid, args->objectid, 2647ac8e9819SChris Mason args->name); 2648ac8e9819SChris Mason 264901b810b8SDavid Sterba out: 2650ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2651ac8e9819SChris Mason ret = -EFAULT; 2652ac8e9819SChris Mason 2653ac8e9819SChris Mason kfree(args); 265498d377a0STARUISI Hiroaki return ret; 265598d377a0STARUISI Hiroaki } 265698d377a0STARUISI Hiroaki 265723d0b79dSTomohiro Misono /* 265823d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 265923d0b79dSTomohiro Misono * 266023d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 266123d0b79dSTomohiro Misono * 266223d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 266323d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 266423d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 266523d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 266623d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 266723d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 266823d0b79dSTomohiro Misono */ 266923d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 267023d0b79dSTomohiro Misono { 267123d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 267223d0b79dSTomohiro Misono struct inode *inode; 267323d0b79dSTomohiro Misono int ret; 267423d0b79dSTomohiro Misono 267523d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 267623d0b79dSTomohiro Misono if (IS_ERR(args)) 267723d0b79dSTomohiro Misono return PTR_ERR(args); 267823d0b79dSTomohiro Misono 267923d0b79dSTomohiro Misono inode = file_inode(file); 268023d0b79dSTomohiro Misono 268123d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 268223d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 268323d0b79dSTomohiro Misono /* 268423d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 268523d0b79dSTomohiro Misono * called 268623d0b79dSTomohiro Misono */ 268723d0b79dSTomohiro Misono kfree(args); 268823d0b79dSTomohiro Misono return -EACCES; 268923d0b79dSTomohiro Misono } 269023d0b79dSTomohiro Misono 269123d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 269223d0b79dSTomohiro Misono 269323d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 269423d0b79dSTomohiro Misono ret = -EFAULT; 269523d0b79dSTomohiro Misono 269623d0b79dSTomohiro Misono kfree(args); 269723d0b79dSTomohiro Misono return ret; 269823d0b79dSTomohiro Misono } 269923d0b79dSTomohiro Misono 2700b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2701b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2702b64ec075STomohiro Misono { 2703b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2704b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2705b64ec075STomohiro Misono struct btrfs_root *root; 2706b64ec075STomohiro Misono struct btrfs_path *path; 2707b64ec075STomohiro Misono struct btrfs_key key; 2708b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2709b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2710b64ec075STomohiro Misono struct extent_buffer *leaf; 2711b64ec075STomohiro Misono unsigned long item_off; 2712b64ec075STomohiro Misono unsigned long item_len; 2713b64ec075STomohiro Misono struct inode *inode; 2714b64ec075STomohiro Misono int slot; 2715b64ec075STomohiro Misono int ret = 0; 2716b64ec075STomohiro Misono 2717b64ec075STomohiro Misono path = btrfs_alloc_path(); 2718b64ec075STomohiro Misono if (!path) 2719b64ec075STomohiro Misono return -ENOMEM; 2720b64ec075STomohiro Misono 2721b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2722b64ec075STomohiro Misono if (!subvol_info) { 2723b64ec075STomohiro Misono btrfs_free_path(path); 2724b64ec075STomohiro Misono return -ENOMEM; 2725b64ec075STomohiro Misono } 2726b64ec075STomohiro Misono 2727b64ec075STomohiro Misono inode = file_inode(file); 2728b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2729b64ec075STomohiro Misono 2730b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2731b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 273256e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2733b64ec075STomohiro Misono if (IS_ERR(root)) { 2734b64ec075STomohiro Misono ret = PTR_ERR(root); 273504734e84SJosef Bacik goto out_free; 273604734e84SJosef Bacik } 2737b64ec075STomohiro Misono root_item = &root->root_item; 2738b64ec075STomohiro Misono 2739b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2740b64ec075STomohiro Misono 2741b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2742b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2743b64ec075STomohiro Misono 2744b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2745b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2746b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2747b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2748b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2749b64ec075STomohiro Misono 2750b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2751b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2752b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2753b64ec075STomohiro Misono 2754b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2755b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2756b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2757b64ec075STomohiro Misono 2758b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2759b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2760b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2761b64ec075STomohiro Misono 2762b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2763b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2764b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2765b64ec075STomohiro Misono 2766b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2767b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2768b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2769b64ec075STomohiro Misono key.offset = 0; 277004734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2771b64ec075STomohiro Misono if (ret < 0) { 2772b64ec075STomohiro Misono goto out; 2773b64ec075STomohiro Misono } else if (path->slots[0] >= 2774b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 277504734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2776b64ec075STomohiro Misono if (ret < 0) { 2777b64ec075STomohiro Misono goto out; 2778b64ec075STomohiro Misono } else if (ret > 0) { 2779b64ec075STomohiro Misono ret = -EUCLEAN; 2780b64ec075STomohiro Misono goto out; 2781b64ec075STomohiro Misono } 2782b64ec075STomohiro Misono } 2783b64ec075STomohiro Misono 2784b64ec075STomohiro Misono leaf = path->nodes[0]; 2785b64ec075STomohiro Misono slot = path->slots[0]; 2786b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2787b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2788b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2789b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2790b64ec075STomohiro Misono 2791b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2792b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2793b64ec075STomohiro Misono 2794b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2795b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2796b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2797b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2798b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2799b64ec075STomohiro Misono item_off, item_len); 2800b64ec075STomohiro Misono } else { 2801b64ec075STomohiro Misono ret = -ENOENT; 2802b64ec075STomohiro Misono goto out; 2803b64ec075STomohiro Misono } 2804b64ec075STomohiro Misono } 2805b64ec075STomohiro Misono 2806b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2807b64ec075STomohiro Misono ret = -EFAULT; 2808b64ec075STomohiro Misono 2809b64ec075STomohiro Misono out: 281000246528SJosef Bacik btrfs_put_root(root); 281104734e84SJosef Bacik out_free: 2812b64ec075STomohiro Misono btrfs_free_path(path); 2813b091f7feSWaiman Long kfree(subvol_info); 2814b64ec075STomohiro Misono return ret; 2815b64ec075STomohiro Misono } 2816b64ec075STomohiro Misono 281742e4b520STomohiro Misono /* 281842e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 281942e4b520STomohiro Misono * except the subvolume name. 282042e4b520STomohiro Misono */ 282142e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 282242e4b520STomohiro Misono { 282342e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 282442e4b520STomohiro Misono struct btrfs_root_ref *rref; 282542e4b520STomohiro Misono struct btrfs_root *root; 282642e4b520STomohiro Misono struct btrfs_path *path; 282742e4b520STomohiro Misono struct btrfs_key key; 282842e4b520STomohiro Misono struct extent_buffer *leaf; 282942e4b520STomohiro Misono struct inode *inode; 283042e4b520STomohiro Misono u64 objectid; 283142e4b520STomohiro Misono int slot; 283242e4b520STomohiro Misono int ret; 283342e4b520STomohiro Misono u8 found; 283442e4b520STomohiro Misono 283542e4b520STomohiro Misono path = btrfs_alloc_path(); 283642e4b520STomohiro Misono if (!path) 283742e4b520STomohiro Misono return -ENOMEM; 283842e4b520STomohiro Misono 283942e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 284042e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 284142e4b520STomohiro Misono btrfs_free_path(path); 284242e4b520STomohiro Misono return PTR_ERR(rootrefs); 284342e4b520STomohiro Misono } 284442e4b520STomohiro Misono 284542e4b520STomohiro Misono inode = file_inode(file); 284642e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 284742e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 284842e4b520STomohiro Misono 284942e4b520STomohiro Misono key.objectid = objectid; 285042e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 285142e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 285242e4b520STomohiro Misono found = 0; 285342e4b520STomohiro Misono 285442e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 285542e4b520STomohiro Misono if (ret < 0) { 285642e4b520STomohiro Misono goto out; 285742e4b520STomohiro Misono } else if (path->slots[0] >= 285842e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 285942e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 286042e4b520STomohiro Misono if (ret < 0) { 286142e4b520STomohiro Misono goto out; 286242e4b520STomohiro Misono } else if (ret > 0) { 286342e4b520STomohiro Misono ret = -EUCLEAN; 286442e4b520STomohiro Misono goto out; 286542e4b520STomohiro Misono } 286642e4b520STomohiro Misono } 286742e4b520STomohiro Misono while (1) { 286842e4b520STomohiro Misono leaf = path->nodes[0]; 286942e4b520STomohiro Misono slot = path->slots[0]; 287042e4b520STomohiro Misono 287142e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 287242e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 287342e4b520STomohiro Misono ret = 0; 287442e4b520STomohiro Misono goto out; 287542e4b520STomohiro Misono } 287642e4b520STomohiro Misono 287742e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 287842e4b520STomohiro Misono ret = -EOVERFLOW; 287942e4b520STomohiro Misono goto out; 288042e4b520STomohiro Misono } 288142e4b520STomohiro Misono 288242e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 288342e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 288442e4b520STomohiro Misono rootrefs->rootref[found].dirid = 288542e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 288642e4b520STomohiro Misono found++; 288742e4b520STomohiro Misono 288842e4b520STomohiro Misono ret = btrfs_next_item(root, path); 288942e4b520STomohiro Misono if (ret < 0) { 289042e4b520STomohiro Misono goto out; 289142e4b520STomohiro Misono } else if (ret > 0) { 289242e4b520STomohiro Misono ret = -EUCLEAN; 289342e4b520STomohiro Misono goto out; 289442e4b520STomohiro Misono } 289542e4b520STomohiro Misono } 289642e4b520STomohiro Misono 289742e4b520STomohiro Misono out: 289842e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 289942e4b520STomohiro Misono rootrefs->num_items = found; 290042e4b520STomohiro Misono /* update min_treeid for next search */ 290142e4b520STomohiro Misono if (found) 290242e4b520STomohiro Misono rootrefs->min_treeid = 290342e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 290442e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 290542e4b520STomohiro Misono ret = -EFAULT; 290642e4b520STomohiro Misono } 290742e4b520STomohiro Misono 290842e4b520STomohiro Misono kfree(rootrefs); 290942e4b520STomohiro Misono btrfs_free_path(path); 291042e4b520STomohiro Misono 291142e4b520STomohiro Misono return ret; 291242e4b520STomohiro Misono } 291342e4b520STomohiro Misono 291476dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2915949964c9SMarcos Paulo de Souza void __user *arg, 2916949964c9SMarcos Paulo de Souza bool destroy_v2) 291776dda93cSYan, Zheng { 291854563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 292076dda93cSYan, Zheng struct dentry *dentry; 29212b0143b5SDavid Howells struct inode *dir = d_inode(parent); 292276dda93cSYan, Zheng struct inode *inode; 292376dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 292476dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2925949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2926949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2927949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2928949964c9SMarcos Paulo de Souza int subvol_namelen; 292976dda93cSYan, Zheng int err = 0; 2930949964c9SMarcos Paulo de Souza bool destroy_parent = false; 293176dda93cSYan, Zheng 2932949964c9SMarcos Paulo de Souza if (destroy_v2) { 2933949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2934949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2935949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2936325c50e3SJeff Mahoney 2937949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2938949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2939949964c9SMarcos Paulo de Souza goto out; 2940949964c9SMarcos Paulo de Souza } 294176dda93cSYan, Zheng 2942949964c9SMarcos Paulo de Souza /* 2943949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2944949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2945949964c9SMarcos Paulo de Souza */ 2946949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2947949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2948949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2949949964c9SMarcos Paulo de Souza 2950949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2951949964c9SMarcos Paulo de Souza if (err) 2952949964c9SMarcos Paulo de Souza goto out; 2953949964c9SMarcos Paulo de Souza } else { 2954949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 295576dda93cSYan, Zheng err = -EINVAL; 295676dda93cSYan, Zheng goto out; 295776dda93cSYan, Zheng } 295876dda93cSYan, Zheng 2959a561be71SAl Viro err = mnt_want_write_file(file); 296076dda93cSYan, Zheng if (err) 296176dda93cSYan, Zheng goto out; 296276dda93cSYan, Zheng 2963949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2964949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2965949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2966949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2967949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2968949964c9SMarcos Paulo de Souza goto out_drop_write; 2969949964c9SMarcos Paulo de Souza } 2970949964c9SMarcos Paulo de Souza 2971949964c9SMarcos Paulo de Souza /* 2972949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2973949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2974949964c9SMarcos Paulo de Souza */ 2975949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2976949964c9SMarcos Paulo de Souza 2977949964c9SMarcos Paulo de Souza /* 2978949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2979949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2980949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2981949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2982949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2983949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2984949964c9SMarcos Paulo de Souza */ 2985949964c9SMarcos Paulo de Souza dput(dentry); 2986949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2987949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2988949964c9SMarcos Paulo de Souza goto out_drop_write; 2989949964c9SMarcos Paulo de Souza } 2990949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2991949964c9SMarcos Paulo de Souza 2992949964c9SMarcos Paulo de Souza /* 2993949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2994949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2995949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2996949964c9SMarcos Paulo de Souza * new parent dentry. 2997949964c9SMarcos Paulo de Souza */ 2998949964c9SMarcos Paulo de Souza destroy_parent = true; 2999949964c9SMarcos Paulo de Souza 3000949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 3001949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 3002949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 3003949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 3004949964c9SMarcos Paulo de Souza goto free_parent; 3005949964c9SMarcos Paulo de Souza } 3006949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 3007949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3008949964c9SMarcos Paulo de Souza } 3009949964c9SMarcos Paulo de Souza } else { 3010949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3011949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3012949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3013949964c9SMarcos Paulo de Souza 3014949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3015949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3016949964c9SMarcos Paulo de Souza 3017949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3018949964c9SMarcos Paulo de Souza if (err) 3019949964c9SMarcos Paulo de Souza goto out; 3020949964c9SMarcos Paulo de Souza } 3021949964c9SMarcos Paulo de Souza 3022949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3023949964c9SMarcos Paulo de Souza 3024949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3025949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3026949964c9SMarcos Paulo de Souza err = -EINVAL; 3027949964c9SMarcos Paulo de Souza goto free_subvol_name; 3028949964c9SMarcos Paulo de Souza } 3029949964c9SMarcos Paulo de Souza 3030949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3031949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3032949964c9SMarcos Paulo de Souza goto free_subvol_name; 3033949964c9SMarcos Paulo de Souza } 3034521e0546SDavid Sterba 303500235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 303600235411SAl Viro if (err == -EINTR) 3037949964c9SMarcos Paulo de Souza goto free_subvol_name; 3038949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 303976dda93cSYan, Zheng if (IS_ERR(dentry)) { 304076dda93cSYan, Zheng err = PTR_ERR(dentry); 304176dda93cSYan, Zheng goto out_unlock_dir; 304276dda93cSYan, Zheng } 304376dda93cSYan, Zheng 30442b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 304576dda93cSYan, Zheng err = -ENOENT; 304676dda93cSYan, Zheng goto out_dput; 304776dda93cSYan, Zheng } 304876dda93cSYan, Zheng 30492b0143b5SDavid Howells inode = d_inode(dentry); 30504260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30514260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30524260f7c7SSage Weil /* 30534260f7c7SSage Weil * Regular user. Only allow this with a special mount 30544260f7c7SSage Weil * option, when the user has write+exec access to the 30554260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30564260f7c7SSage Weil * allowed. 30574260f7c7SSage Weil * 30584260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30594260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30604260f7c7SSage Weil * otherwise be able to delete. 30614260f7c7SSage Weil * 30624260f7c7SSage Weil * Users who want to delete empty subvols should try 30634260f7c7SSage Weil * rmdir(2). 30644260f7c7SSage Weil */ 30654260f7c7SSage Weil err = -EPERM; 30660b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30674260f7c7SSage Weil goto out_dput; 30684260f7c7SSage Weil 30694260f7c7SSage Weil /* 30704260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30714260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30724260f7c7SSage Weil * must be called on the dentry referencing the root 30734260f7c7SSage Weil * of the subvol, not a random directory contained 30744260f7c7SSage Weil * within it. 30754260f7c7SSage Weil */ 30764260f7c7SSage Weil err = -EINVAL; 30774260f7c7SSage Weil if (root == dest) 30784260f7c7SSage Weil goto out_dput; 30794260f7c7SSage Weil 30804260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30814260f7c7SSage Weil if (err) 30824260f7c7SSage Weil goto out_dput; 30835c39da5bSMiao Xie } 30844260f7c7SSage Weil 30855c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30864260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30874260f7c7SSage Weil if (err) 30884260f7c7SSage Weil goto out_dput; 30894260f7c7SSage Weil 30904a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 309176dda93cSYan, Zheng err = -EINVAL; 309276dda93cSYan, Zheng goto out_dput; 309376dda93cSYan, Zheng } 309476dda93cSYan, Zheng 30955955102cSAl Viro inode_lock(inode); 3096f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 30975955102cSAl Viro inode_unlock(inode); 309846008d9dSAmir Goldstein if (!err) { 309946008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 310076dda93cSYan, Zheng d_delete(dentry); 310146008d9dSAmir Goldstein } 3102fa6ac876SLiu Bo 310376dda93cSYan, Zheng out_dput: 310476dda93cSYan, Zheng dput(dentry); 310576dda93cSYan, Zheng out_unlock_dir: 31065955102cSAl Viro inode_unlock(dir); 3107949964c9SMarcos Paulo de Souza free_subvol_name: 3108949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3109949964c9SMarcos Paulo de Souza free_parent: 3110949964c9SMarcos Paulo de Souza if (destroy_parent) 3111949964c9SMarcos Paulo de Souza dput(parent); 311200235411SAl Viro out_drop_write: 31132a79f17eSAl Viro mnt_drop_write_file(file); 311476dda93cSYan, Zheng out: 3115949964c9SMarcos Paulo de Souza kfree(vol_args2); 311676dda93cSYan, Zheng kfree(vol_args); 311776dda93cSYan, Zheng return err; 311876dda93cSYan, Zheng } 311976dda93cSYan, Zheng 31201e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3121f46b5a66SChristoph Hellwig { 3122496ad9aaSAl Viro struct inode *inode = file_inode(file); 3123f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31241e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3125c146afadSYan Zheng int ret; 3126c146afadSYan Zheng 312725122d15SIlya Dryomov ret = mnt_want_write_file(file); 312825122d15SIlya Dryomov if (ret) 312925122d15SIlya Dryomov return ret; 3130b83cc969SLi Zefan 313125122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 313225122d15SIlya Dryomov ret = -EROFS; 313325122d15SIlya Dryomov goto out; 31345ac00addSStefan Behrens } 3135f46b5a66SChristoph Hellwig 3136f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3137f46b5a66SChristoph Hellwig case S_IFDIR: 3138e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3139e441d54dSChris Mason ret = -EPERM; 3140e441d54dSChris Mason goto out; 3141e441d54dSChris Mason } 3142de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3143f46b5a66SChristoph Hellwig break; 3144f46b5a66SChristoph Hellwig case S_IFREG: 3145616d374eSAdam Borowski /* 3146616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3147616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3148616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3149616d374eSAdam Borowski */ 3150616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3151616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3152616d374eSAdam Borowski ret = -EPERM; 3153e441d54dSChris Mason goto out; 3154e441d54dSChris Mason } 31551e701a32SChris Mason 31561e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31571e701a32SChris Mason if (!range) { 31581e701a32SChris Mason ret = -ENOMEM; 31591e701a32SChris Mason goto out; 31601e701a32SChris Mason } 31611e701a32SChris Mason 31621e701a32SChris Mason if (argp) { 31631e701a32SChris Mason if (copy_from_user(range, argp, 31641e701a32SChris Mason sizeof(*range))) { 31651e701a32SChris Mason ret = -EFAULT; 31661e701a32SChris Mason kfree(range); 3167683be16eSDan Carpenter goto out; 31681e701a32SChris Mason } 31691e701a32SChris Mason /* compression requires us to start the IO */ 31701e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31711e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31721e701a32SChris Mason range->extent_thresh = (u32)-1; 31731e701a32SChris Mason } 31741e701a32SChris Mason } else { 31751e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31761e701a32SChris Mason range->len = (u64)-1; 31771e701a32SChris Mason } 3178496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31797c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31804cb5300bSChris Mason if (ret > 0) 31814cb5300bSChris Mason ret = 0; 31821e701a32SChris Mason kfree(range); 3183f46b5a66SChristoph Hellwig break; 31848929ecfaSYan, Zheng default: 31858929ecfaSYan, Zheng ret = -EINVAL; 3186f46b5a66SChristoph Hellwig } 3187e441d54dSChris Mason out: 318825122d15SIlya Dryomov mnt_drop_write_file(file); 3189e441d54dSChris Mason return ret; 3190f46b5a66SChristoph Hellwig } 3191f46b5a66SChristoph Hellwig 31922ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3193f46b5a66SChristoph Hellwig { 3194f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3195f46b5a66SChristoph Hellwig int ret; 3196f46b5a66SChristoph Hellwig 3197e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3198e441d54dSChris Mason return -EPERM; 3199e441d54dSChris Mason 3200c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3201e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3202c9e9f97bSIlya Dryomov 3203dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3204c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3205c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3206c9e9f97bSIlya Dryomov goto out; 3207c9e9f97bSIlya Dryomov } 3208f46b5a66SChristoph Hellwig 32095516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32102ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3211f46b5a66SChristoph Hellwig 321243d20761SAnand Jain if (!ret) 32130b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 321443d20761SAnand Jain 3215f46b5a66SChristoph Hellwig kfree(vol_args); 3216c9e9f97bSIlya Dryomov out: 3217c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3218f46b5a66SChristoph Hellwig return ret; 3219f46b5a66SChristoph Hellwig } 3220f46b5a66SChristoph Hellwig 32216b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3222f46b5a66SChristoph Hellwig { 32230b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32240b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32256b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3226f46b5a66SChristoph Hellwig int ret; 3227f46b5a66SChristoph Hellwig 3228e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3229e441d54dSChris Mason return -EPERM; 3230e441d54dSChris Mason 3231da24927bSMiao Xie ret = mnt_want_write_file(file); 3232da24927bSMiao Xie if (ret) 3233da24927bSMiao Xie return ret; 3234c146afadSYan Zheng 3235dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3236c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3237c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3238c47ca32dSDan Carpenter goto err_drop; 3239c9e9f97bSIlya Dryomov } 3240f46b5a66SChristoph Hellwig 3241748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3242fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3243fd4e994bSOmar Sandoval goto out; 3244fd4e994bSOmar Sandoval } 3245f46b5a66SChristoph Hellwig 3246c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3247183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3248183860f6SAnand Jain goto out; 3249183860f6SAnand Jain } 3250183860f6SAnand Jain 3251735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 32522ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 32536b526ed7SAnand Jain } else { 32546b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 32552ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 32566b526ed7SAnand Jain } 3257c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3258183860f6SAnand Jain 32596b526ed7SAnand Jain if (!ret) { 3260735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32610b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32626b526ed7SAnand Jain vol_args->devid); 32636b526ed7SAnand Jain else 32640b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32656b526ed7SAnand Jain vol_args->name); 32666b526ed7SAnand Jain } 3267183860f6SAnand Jain out: 3268183860f6SAnand Jain kfree(vol_args); 3269c47ca32dSDan Carpenter err_drop: 32704ac20c70SIlya Dryomov mnt_drop_write_file(file); 3271f46b5a66SChristoph Hellwig return ret; 3272f46b5a66SChristoph Hellwig } 3273f46b5a66SChristoph Hellwig 3274f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3275f46b5a66SChristoph Hellwig { 32760b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32770b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3278f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3279f46b5a66SChristoph Hellwig int ret; 3280f46b5a66SChristoph Hellwig 3281f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3282f46b5a66SChristoph Hellwig return -EPERM; 3283f46b5a66SChristoph Hellwig 3284f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3285f46b5a66SChristoph Hellwig if (ret) 3286f46b5a66SChristoph Hellwig return ret; 3287f46b5a66SChristoph Hellwig 3288c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3289f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 329058d7bbf8SDavid Sterba goto out_drop_write; 329158d7bbf8SDavid Sterba } 329258d7bbf8SDavid Sterba 329358d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 329458d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 329558d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3296f46b5a66SChristoph Hellwig goto out; 3297f46b5a66SChristoph Hellwig } 3298f46b5a66SChristoph Hellwig 329958d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 33002ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3301f46b5a66SChristoph Hellwig 3302f46b5a66SChristoph Hellwig if (!ret) 33030b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3304f46b5a66SChristoph Hellwig kfree(vol_args); 330558d7bbf8SDavid Sterba out: 3306c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 330758d7bbf8SDavid Sterba out_drop_write: 3308f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 330958d7bbf8SDavid Sterba 3310f46b5a66SChristoph Hellwig return ret; 3311f46b5a66SChristoph Hellwig } 3312f46b5a66SChristoph Hellwig 33132ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33142ff7e61eSJeff Mahoney void __user *arg) 3315475f6387SJan Schmidt { 3316027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3317475f6387SJan Schmidt struct btrfs_device *device; 33180b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3319137c5418SJohannes Thumshirn u64 flags_in; 3320027ed2f0SLi Zefan int ret = 0; 3321475f6387SJan Schmidt 3322137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3323137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3324137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3325137c5418SJohannes Thumshirn 3326137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3327137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3328027ed2f0SLi Zefan 3329d03262c7SDavid Sterba rcu_read_lock(); 3330027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3331475f6387SJan Schmidt 3332d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3333027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3334027ed2f0SLi Zefan fi_args->max_id = device->devid; 3335475f6387SJan Schmidt } 3336d03262c7SDavid Sterba rcu_read_unlock(); 3337475f6387SJan Schmidt 3338de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3339bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3340bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3341bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 334280a773fbSDavid Sterba 3343137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3344137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3345137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3346137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3347137c5418SJohannes Thumshirn } 3348137c5418SJohannes Thumshirn 33490fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33500fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33510fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33520fb408a5SJohannes Thumshirn } 33530fb408a5SJohannes Thumshirn 335449bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 335549bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 335649bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 335749bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 335849bac897SJohannes Thumshirn } 335949bac897SJohannes Thumshirn 3360027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3361027ed2f0SLi Zefan ret = -EFAULT; 3362475f6387SJan Schmidt 3363027ed2f0SLi Zefan kfree(fi_args); 3364027ed2f0SLi Zefan return ret; 3365475f6387SJan Schmidt } 3366475f6387SJan Schmidt 33672ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33682ff7e61eSJeff Mahoney void __user *arg) 3369475f6387SJan Schmidt { 3370475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3371475f6387SJan Schmidt struct btrfs_device *dev; 3372475f6387SJan Schmidt int ret = 0; 3373475f6387SJan Schmidt char *s_uuid = NULL; 3374475f6387SJan Schmidt 3375475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3376475f6387SJan Schmidt if (IS_ERR(di_args)) 3377475f6387SJan Schmidt return PTR_ERR(di_args); 3378475f6387SJan Schmidt 3379dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3380475f6387SJan Schmidt s_uuid = di_args->uuid; 3381475f6387SJan Schmidt 3382c5593ca3SDavid Sterba rcu_read_lock(); 3383e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3384b2598edfSAnand Jain NULL); 3385475f6387SJan Schmidt 3386475f6387SJan Schmidt if (!dev) { 3387475f6387SJan Schmidt ret = -ENODEV; 3388475f6387SJan Schmidt goto out; 3389475f6387SJan Schmidt } 3390475f6387SJan Schmidt 3391475f6387SJan Schmidt di_args->devid = dev->devid; 33927cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33937cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3394475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3395a27202fbSJim Meyering if (dev->name) { 3396672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3397672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3398a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3399a27202fbSJim Meyering } else { 340099ba55adSStefan Behrens di_args->path[0] = '\0'; 3401a27202fbSJim Meyering } 3402475f6387SJan Schmidt 3403475f6387SJan Schmidt out: 3404c5593ca3SDavid Sterba rcu_read_unlock(); 3405475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3406475f6387SJan Schmidt ret = -EFAULT; 3407475f6387SJan Schmidt 3408475f6387SJan Schmidt kfree(di_args); 3409475f6387SJan Schmidt return ret; 3410475f6387SJan Schmidt } 3411475f6387SJan Schmidt 34126ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34136ef5ed0dSJosef Bacik { 3414496ad9aaSAl Viro struct inode *inode = file_inode(file); 34150b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34166ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34176ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34186ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34196ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34202a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34216ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34226ef5ed0dSJosef Bacik u64 objectid = 0; 34236ef5ed0dSJosef Bacik u64 dir_id; 34243c04ce01SMiao Xie int ret; 34256ef5ed0dSJosef Bacik 34266ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34276ef5ed0dSJosef Bacik return -EPERM; 34286ef5ed0dSJosef Bacik 34293c04ce01SMiao Xie ret = mnt_want_write_file(file); 34303c04ce01SMiao Xie if (ret) 34313c04ce01SMiao Xie return ret; 34323c04ce01SMiao Xie 34333c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34343c04ce01SMiao Xie ret = -EFAULT; 34353c04ce01SMiao Xie goto out; 34363c04ce01SMiao Xie } 34376ef5ed0dSJosef Bacik 34386ef5ed0dSJosef Bacik if (!objectid) 34391cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34406ef5ed0dSJosef Bacik 344156e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34423c04ce01SMiao Xie if (IS_ERR(new_root)) { 34433c04ce01SMiao Xie ret = PTR_ERR(new_root); 34443c04ce01SMiao Xie goto out; 34453c04ce01SMiao Xie } 34462a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34472a2b5d62SJosef Bacik ret = -ENOENT; 34482a2b5d62SJosef Bacik goto out_free; 34492a2b5d62SJosef Bacik } 34506ef5ed0dSJosef Bacik 34516ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34523c04ce01SMiao Xie if (!path) { 34533c04ce01SMiao Xie ret = -ENOMEM; 34542a2b5d62SJosef Bacik goto out_free; 34553c04ce01SMiao Xie } 34566ef5ed0dSJosef Bacik 34576ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 345898d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34593c04ce01SMiao Xie ret = PTR_ERR(trans); 34602a2b5d62SJosef Bacik goto out_free; 34616ef5ed0dSJosef Bacik } 34626ef5ed0dSJosef Bacik 34630b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34640b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34656ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3466cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34672a2b5d62SJosef Bacik btrfs_release_path(path); 34683a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34690b246afaSJeff Mahoney btrfs_err(fs_info, 34705d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34713c04ce01SMiao Xie ret = -ENOENT; 34722a2b5d62SJosef Bacik goto out_free; 34736ef5ed0dSJosef Bacik } 34746ef5ed0dSJosef Bacik 34756ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34766ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34776ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34782a2b5d62SJosef Bacik btrfs_release_path(path); 34796ef5ed0dSJosef Bacik 34800b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34813a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34822a2b5d62SJosef Bacik out_free: 348300246528SJosef Bacik btrfs_put_root(new_root); 34842a2b5d62SJosef Bacik btrfs_free_path(path); 34853c04ce01SMiao Xie out: 34863c04ce01SMiao Xie mnt_drop_write_file(file); 34873c04ce01SMiao Xie return ret; 34886ef5ed0dSJosef Bacik } 34896ef5ed0dSJosef Bacik 3490c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3491bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3492bf5fc093SJosef Bacik { 349332da5386SDavid Sterba struct btrfs_block_group *block_group; 3494bf5fc093SJosef Bacik 3495bf5fc093SJosef Bacik space->total_bytes = 0; 3496bf5fc093SJosef Bacik space->used_bytes = 0; 3497bf5fc093SJosef Bacik space->flags = 0; 3498bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3499bf5fc093SJosef Bacik space->flags = block_group->flags; 3500b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3501bf38be65SDavid Sterba space->used_bytes += block_group->used; 3502bf5fc093SJosef Bacik } 3503bf5fc093SJosef Bacik } 3504bf5fc093SJosef Bacik 35052ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 35062ff7e61eSJeff Mahoney void __user *arg) 35071406e432SJosef Bacik { 35081406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35091406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35101406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35117fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 351213f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35131406e432SJosef Bacik struct btrfs_space_info *info; 3514315d8e98SColin Ian King static const u64 types[] = { 3515315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3516bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3517bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3518315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3519315d8e98SColin Ian King }; 3520bf5fc093SJosef Bacik int num_types = 4; 35217fde62bfSChris Mason int alloc_size; 35221406e432SJosef Bacik int ret = 0; 352351788b1bSDan Rosenberg u64 slot_count = 0; 3524bf5fc093SJosef Bacik int i, c; 35251406e432SJosef Bacik 35261406e432SJosef Bacik if (copy_from_user(&space_args, 35271406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35281406e432SJosef Bacik sizeof(space_args))) 35291406e432SJosef Bacik return -EFAULT; 35301406e432SJosef Bacik 3531bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3532bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3533bf5fc093SJosef Bacik 3534bf5fc093SJosef Bacik info = NULL; 353572804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3536bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3537bf5fc093SJosef Bacik info = tmp; 3538bf5fc093SJosef Bacik break; 3539bf5fc093SJosef Bacik } 3540bf5fc093SJosef Bacik } 35411406e432SJosef Bacik 3542bf5fc093SJosef Bacik if (!info) 3543bf5fc093SJosef Bacik continue; 3544bf5fc093SJosef Bacik 3545bf5fc093SJosef Bacik down_read(&info->groups_sem); 3546bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3547bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3548bf5fc093SJosef Bacik slot_count++; 3549bf5fc093SJosef Bacik } 3550bf5fc093SJosef Bacik up_read(&info->groups_sem); 3551bf5fc093SJosef Bacik } 3552bf5fc093SJosef Bacik 355336523e95SDavid Sterba /* 355436523e95SDavid Sterba * Global block reserve, exported as a space_info 355536523e95SDavid Sterba */ 355636523e95SDavid Sterba slot_count++; 355736523e95SDavid Sterba 35587fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35597fde62bfSChris Mason if (space_args.space_slots == 0) { 35607fde62bfSChris Mason space_args.total_spaces = slot_count; 35617fde62bfSChris Mason goto out; 35627fde62bfSChris Mason } 3563bf5fc093SJosef Bacik 356451788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3565bf5fc093SJosef Bacik 35667fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3567bf5fc093SJosef Bacik 35687fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35697fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35707fde62bfSChris Mason */ 357109cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35727fde62bfSChris Mason return -ENOMEM; 35737fde62bfSChris Mason 35747fde62bfSChris Mason space_args.total_spaces = 0; 35758d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35767fde62bfSChris Mason if (!dest) 35777fde62bfSChris Mason return -ENOMEM; 35787fde62bfSChris Mason dest_orig = dest; 35797fde62bfSChris Mason 35807fde62bfSChris Mason /* now we have a buffer to copy into */ 3581bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3582bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3583bf5fc093SJosef Bacik 358451788b1bSDan Rosenberg if (!slot_count) 358551788b1bSDan Rosenberg break; 358651788b1bSDan Rosenberg 3587bf5fc093SJosef Bacik info = NULL; 358872804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3589bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3590bf5fc093SJosef Bacik info = tmp; 35917fde62bfSChris Mason break; 3592bf5fc093SJosef Bacik } 3593bf5fc093SJosef Bacik } 35947fde62bfSChris Mason 3595bf5fc093SJosef Bacik if (!info) 3596bf5fc093SJosef Bacik continue; 3597bf5fc093SJosef Bacik down_read(&info->groups_sem); 3598bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3599bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3600c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3601c065f5b1SSu Yue &space); 36027fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 36031406e432SJosef Bacik dest++; 36041406e432SJosef Bacik space_args.total_spaces++; 360551788b1bSDan Rosenberg slot_count--; 36061406e432SJosef Bacik } 360751788b1bSDan Rosenberg if (!slot_count) 360851788b1bSDan Rosenberg break; 3609bf5fc093SJosef Bacik } 3610bf5fc093SJosef Bacik up_read(&info->groups_sem); 3611bf5fc093SJosef Bacik } 36121406e432SJosef Bacik 361336523e95SDavid Sterba /* 361436523e95SDavid Sterba * Add global block reserve 361536523e95SDavid Sterba */ 361636523e95SDavid Sterba if (slot_count) { 36170b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 361836523e95SDavid Sterba 361936523e95SDavid Sterba spin_lock(&block_rsv->lock); 362036523e95SDavid Sterba space.total_bytes = block_rsv->size; 362136523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 362236523e95SDavid Sterba spin_unlock(&block_rsv->lock); 362336523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 362436523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 362536523e95SDavid Sterba space_args.total_spaces++; 362636523e95SDavid Sterba } 362736523e95SDavid Sterba 36282eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36297fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36307fde62bfSChris Mason 36317fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36327fde62bfSChris Mason ret = -EFAULT; 36337fde62bfSChris Mason 36347fde62bfSChris Mason kfree(dest_orig); 36357fde62bfSChris Mason out: 36367fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36371406e432SJosef Bacik ret = -EFAULT; 36381406e432SJosef Bacik 36391406e432SJosef Bacik return ret; 36401406e432SJosef Bacik } 36411406e432SJosef Bacik 36429a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36439a8c28beSMiao Xie void __user *argp) 364446204592SSage Weil { 364546204592SSage Weil struct btrfs_trans_handle *trans; 364646204592SSage Weil u64 transid; 3647db5b493aSTsutomu Itoh int ret; 364846204592SSage Weil 3649d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3650ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3651ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 365298d5dc13STsutomu Itoh return PTR_ERR(trans); 3653ff7c1d33SMiao Xie 3654ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3655ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3656ff7c1d33SMiao Xie goto out; 3657ff7c1d33SMiao Xie } 365846204592SSage Weil transid = trans->transid; 36593a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36608b2b2d3cSTsutomu Itoh if (ret) { 36613a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3662db5b493aSTsutomu Itoh return ret; 36638b2b2d3cSTsutomu Itoh } 3664ff7c1d33SMiao Xie out: 366546204592SSage Weil if (argp) 366646204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 366746204592SSage Weil return -EFAULT; 366846204592SSage Weil return 0; 366946204592SSage Weil } 367046204592SSage Weil 36712ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36729a8c28beSMiao Xie void __user *argp) 367346204592SSage Weil { 367446204592SSage Weil u64 transid; 367546204592SSage Weil 367646204592SSage Weil if (argp) { 367746204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 367846204592SSage Weil return -EFAULT; 367946204592SSage Weil } else { 368046204592SSage Weil transid = 0; /* current trans */ 368146204592SSage Weil } 36822ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 368346204592SSage Weil } 368446204592SSage Weil 3685b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3686475f6387SJan Schmidt { 36870b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3688475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3689b8e95489SMiao Xie int ret; 3690475f6387SJan Schmidt 3691475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3692475f6387SJan Schmidt return -EPERM; 3693475f6387SJan Schmidt 3694475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3695475f6387SJan Schmidt if (IS_ERR(sa)) 3696475f6387SJan Schmidt return PTR_ERR(sa); 3697475f6387SJan Schmidt 3698b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3699b8e95489SMiao Xie ret = mnt_want_write_file(file); 3700b8e95489SMiao Xie if (ret) 3701b8e95489SMiao Xie goto out; 3702b8e95489SMiao Xie } 3703b8e95489SMiao Xie 37040b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 370563a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 370663a212abSStefan Behrens 0); 3707475f6387SJan Schmidt 37085afe6ce7SFilipe Manana /* 37095afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37105afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37115afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37125afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37135afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37145afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37155afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37165afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37175afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37185afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37195afe6ce7SFilipe Manana */ 37205afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3721475f6387SJan Schmidt ret = -EFAULT; 3722475f6387SJan Schmidt 3723b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3724b8e95489SMiao Xie mnt_drop_write_file(file); 3725b8e95489SMiao Xie out: 3726475f6387SJan Schmidt kfree(sa); 3727475f6387SJan Schmidt return ret; 3728475f6387SJan Schmidt } 3729475f6387SJan Schmidt 37302ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3731475f6387SJan Schmidt { 3732475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3733475f6387SJan Schmidt return -EPERM; 3734475f6387SJan Schmidt 37352ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3736475f6387SJan Schmidt } 3737475f6387SJan Schmidt 37382ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3739475f6387SJan Schmidt void __user *arg) 3740475f6387SJan Schmidt { 3741475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3742475f6387SJan Schmidt int ret; 3743475f6387SJan Schmidt 3744475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3745475f6387SJan Schmidt return -EPERM; 3746475f6387SJan Schmidt 3747475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3748475f6387SJan Schmidt if (IS_ERR(sa)) 3749475f6387SJan Schmidt return PTR_ERR(sa); 3750475f6387SJan Schmidt 37512ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3752475f6387SJan Schmidt 37534fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3754475f6387SJan Schmidt ret = -EFAULT; 3755475f6387SJan Schmidt 3756475f6387SJan Schmidt kfree(sa); 3757475f6387SJan Schmidt return ret; 3758475f6387SJan Schmidt } 3759475f6387SJan Schmidt 37602ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3761b27f7c0cSDavid Sterba void __user *arg) 3762c11d2c23SStefan Behrens { 3763c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3764c11d2c23SStefan Behrens int ret; 3765c11d2c23SStefan Behrens 3766c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3767c11d2c23SStefan Behrens if (IS_ERR(sa)) 3768c11d2c23SStefan Behrens return PTR_ERR(sa); 3769c11d2c23SStefan Behrens 3770b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3771b27f7c0cSDavid Sterba kfree(sa); 3772b27f7c0cSDavid Sterba return -EPERM; 3773b27f7c0cSDavid Sterba } 3774b27f7c0cSDavid Sterba 37752ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3776c11d2c23SStefan Behrens 3777eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3778c11d2c23SStefan Behrens ret = -EFAULT; 3779c11d2c23SStefan Behrens 3780c11d2c23SStefan Behrens kfree(sa); 3781c11d2c23SStefan Behrens return ret; 3782c11d2c23SStefan Behrens } 3783c11d2c23SStefan Behrens 37842ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37852ff7e61eSJeff Mahoney void __user *arg) 37863f6bcfbdSStefan Behrens { 37873f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37883f6bcfbdSStefan Behrens int ret; 37893f6bcfbdSStefan Behrens 37903f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37913f6bcfbdSStefan Behrens return -EPERM; 37923f6bcfbdSStefan Behrens 37933f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37943f6bcfbdSStefan Behrens if (IS_ERR(p)) 37953f6bcfbdSStefan Behrens return PTR_ERR(p); 37963f6bcfbdSStefan Behrens 37973f6bcfbdSStefan Behrens switch (p->cmd) { 37983f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3799bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3800adfa97cbSIlya Dryomov ret = -EROFS; 3801adfa97cbSIlya Dryomov goto out; 3802adfa97cbSIlya Dryomov } 3803c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3804e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 38053f6bcfbdSStefan Behrens } else { 38062ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3807c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38083f6bcfbdSStefan Behrens } 38093f6bcfbdSStefan Behrens break; 38103f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38110b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38123f6bcfbdSStefan Behrens ret = 0; 38133f6bcfbdSStefan Behrens break; 38143f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 381517d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 381697282031SAnand Jain ret = 0; 38173f6bcfbdSStefan Behrens break; 38183f6bcfbdSStefan Behrens default: 38193f6bcfbdSStefan Behrens ret = -EINVAL; 38203f6bcfbdSStefan Behrens break; 38213f6bcfbdSStefan Behrens } 38223f6bcfbdSStefan Behrens 3823d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38243f6bcfbdSStefan Behrens ret = -EFAULT; 3825adfa97cbSIlya Dryomov out: 38263f6bcfbdSStefan Behrens kfree(p); 38273f6bcfbdSStefan Behrens return ret; 38283f6bcfbdSStefan Behrens } 38293f6bcfbdSStefan Behrens 3830d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3831d7728c96SJan Schmidt { 3832d7728c96SJan Schmidt int ret = 0; 3833d7728c96SJan Schmidt int i; 3834740c3d22SChris Mason u64 rel_ptr; 3835d7728c96SJan Schmidt int size; 3836806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3837d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3838d7728c96SJan Schmidt struct btrfs_path *path; 3839d7728c96SJan Schmidt 384082b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3841d7728c96SJan Schmidt return -EPERM; 3842d7728c96SJan Schmidt 3843d7728c96SJan Schmidt path = btrfs_alloc_path(); 3844d7728c96SJan Schmidt if (!path) { 3845d7728c96SJan Schmidt ret = -ENOMEM; 3846d7728c96SJan Schmidt goto out; 3847d7728c96SJan Schmidt } 3848d7728c96SJan Schmidt 3849d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3850d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3851d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3852d7728c96SJan Schmidt ipa = NULL; 3853d7728c96SJan Schmidt goto out; 3854d7728c96SJan Schmidt } 3855d7728c96SJan Schmidt 3856d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3857d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3858d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3859d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3860d7728c96SJan Schmidt ipath = NULL; 3861d7728c96SJan Schmidt goto out; 3862d7728c96SJan Schmidt } 3863d7728c96SJan Schmidt 3864d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3865d7728c96SJan Schmidt if (ret < 0) 3866d7728c96SJan Schmidt goto out; 3867d7728c96SJan Schmidt 3868d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3869745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3870745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3871740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3872d7728c96SJan Schmidt } 3873d7728c96SJan Schmidt 3874718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3875718dc5faSOmar Sandoval ipath->fspath, size); 3876d7728c96SJan Schmidt if (ret) { 3877d7728c96SJan Schmidt ret = -EFAULT; 3878d7728c96SJan Schmidt goto out; 3879d7728c96SJan Schmidt } 3880d7728c96SJan Schmidt 3881d7728c96SJan Schmidt out: 3882d7728c96SJan Schmidt btrfs_free_path(path); 3883d7728c96SJan Schmidt free_ipath(ipath); 3884d7728c96SJan Schmidt kfree(ipa); 3885d7728c96SJan Schmidt 3886d7728c96SJan Schmidt return ret; 3887d7728c96SJan Schmidt } 3888d7728c96SJan Schmidt 3889d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3890d7728c96SJan Schmidt { 3891d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3892d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3893d7728c96SJan Schmidt 3894d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3895d7728c96SJan Schmidt inodes->bytes_left -= c; 3896d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3897d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3898d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3899d7728c96SJan Schmidt inodes->elem_cnt += 3; 3900d7728c96SJan Schmidt } else { 3901d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3902d7728c96SJan Schmidt inodes->bytes_left = 0; 3903d7728c96SJan Schmidt inodes->elem_missed += 3; 3904d7728c96SJan Schmidt } 3905d7728c96SJan Schmidt 3906d7728c96SJan Schmidt return 0; 3907d7728c96SJan Schmidt } 3908d7728c96SJan Schmidt 39092ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3910d24a67b2SZygo Blaxell void __user *arg, int version) 3911d7728c96SJan Schmidt { 3912d7728c96SJan Schmidt int ret = 0; 3913d7728c96SJan Schmidt int size; 3914d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3915d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3916d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3917d24a67b2SZygo Blaxell bool ignore_offset; 3918d7728c96SJan Schmidt 3919d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3920d7728c96SJan Schmidt return -EPERM; 3921d7728c96SJan Schmidt 3922d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39237b9ea627SShailendra Verma if (IS_ERR(loi)) 39247b9ea627SShailendra Verma return PTR_ERR(loi); 3925d7728c96SJan Schmidt 3926d24a67b2SZygo Blaxell if (version == 1) { 3927d24a67b2SZygo Blaxell ignore_offset = false; 3928b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3929d24a67b2SZygo Blaxell } else { 3930d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3931d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3932d24a67b2SZygo Blaxell ret = -EINVAL; 3933d24a67b2SZygo Blaxell goto out_loi; 3934d24a67b2SZygo Blaxell } 3935d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3936d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3937d24a67b2SZygo Blaxell ret = -EINVAL; 3938d24a67b2SZygo Blaxell goto out_loi; 3939d24a67b2SZygo Blaxell } 3940d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3941b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3942d24a67b2SZygo Blaxell } 3943d24a67b2SZygo Blaxell 3944d7728c96SJan Schmidt path = btrfs_alloc_path(); 3945d7728c96SJan Schmidt if (!path) { 3946d7728c96SJan Schmidt ret = -ENOMEM; 3947d7728c96SJan Schmidt goto out; 3948d7728c96SJan Schmidt } 3949d7728c96SJan Schmidt 3950d7728c96SJan Schmidt inodes = init_data_container(size); 3951d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3952d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3953d7728c96SJan Schmidt inodes = NULL; 3954d7728c96SJan Schmidt goto out; 3955d7728c96SJan Schmidt } 3956d7728c96SJan Schmidt 39572ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3958d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3959df031f07SLiu Bo if (ret == -EINVAL) 3960d7728c96SJan Schmidt ret = -ENOENT; 3961d7728c96SJan Schmidt if (ret < 0) 3962d7728c96SJan Schmidt goto out; 3963d7728c96SJan Schmidt 3964718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3965718dc5faSOmar Sandoval size); 3966d7728c96SJan Schmidt if (ret) 3967d7728c96SJan Schmidt ret = -EFAULT; 3968d7728c96SJan Schmidt 3969d7728c96SJan Schmidt out: 3970d7728c96SJan Schmidt btrfs_free_path(path); 3971f54de068SDavid Sterba kvfree(inodes); 3972d24a67b2SZygo Blaxell out_loi: 3973d7728c96SJan Schmidt kfree(loi); 3974d7728c96SJan Schmidt 3975d7728c96SJan Schmidt return ret; 3976d7728c96SJan Schmidt } 3977d7728c96SJan Schmidt 3978008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3979c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3980c9e9f97bSIlya Dryomov { 3981c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3982c9e9f97bSIlya Dryomov 3983c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3984c9e9f97bSIlya Dryomov 39853009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3986837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3987837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3988837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3989a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3990a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3991837d5b6eSIlya Dryomov 3992c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3993c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3994c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 399519a39dceSIlya Dryomov 399619a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 399719a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 399819a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3999c9e9f97bSIlya Dryomov } 4000c9e9f97bSIlya Dryomov 40019ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 4002c9e9f97bSIlya Dryomov { 4003496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 4004c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 4005c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 4006c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 4007ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4008c9e9f97bSIlya Dryomov int ret; 4009c9e9f97bSIlya Dryomov 4010c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4011c9e9f97bSIlya Dryomov return -EPERM; 4012c9e9f97bSIlya Dryomov 4013e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40149ba1f6e4SLiu Bo if (ret) 40159ba1f6e4SLiu Bo return ret; 40169ba1f6e4SLiu Bo 4017ed0fb78fSIlya Dryomov again: 4018c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4019c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4020ed0fb78fSIlya Dryomov need_unlock = true; 4021ed0fb78fSIlya Dryomov goto locked; 4022ed0fb78fSIlya Dryomov } 4023ed0fb78fSIlya Dryomov 4024ed0fb78fSIlya Dryomov /* 402501327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4026ed0fb78fSIlya Dryomov * (1) some other op is running 4027ed0fb78fSIlya Dryomov * (2) balance is running 4028ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4029ed0fb78fSIlya Dryomov */ 4030ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4031ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4032ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40333009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4034ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4035dccdb07bSDavid Sterba /* 4036dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4037dccdb07bSDavid Sterba * we'll reexamine the status again. 4038dccdb07bSDavid Sterba */ 4039ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4040ed0fb78fSIlya Dryomov 4041ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40423009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4043ed0fb78fSIlya Dryomov /* this is (3) */ 4044ed0fb78fSIlya Dryomov need_unlock = false; 4045ed0fb78fSIlya Dryomov goto locked; 4046ed0fb78fSIlya Dryomov } 4047ed0fb78fSIlya Dryomov 4048ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4049ed0fb78fSIlya Dryomov goto again; 4050ed0fb78fSIlya Dryomov } else { 4051ed0fb78fSIlya Dryomov /* this is (2) */ 4052ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4053ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4054ed0fb78fSIlya Dryomov goto out; 4055ed0fb78fSIlya Dryomov } 4056ed0fb78fSIlya Dryomov } else { 4057ed0fb78fSIlya Dryomov /* this is (1) */ 4058ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4059e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4060ed0fb78fSIlya Dryomov goto out; 4061ed0fb78fSIlya Dryomov } 4062ed0fb78fSIlya Dryomov 4063ed0fb78fSIlya Dryomov locked: 4064c9e9f97bSIlya Dryomov 4065c9e9f97bSIlya Dryomov if (arg) { 4066c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4067c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4068c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4069ed0fb78fSIlya Dryomov goto out_unlock; 4070c9e9f97bSIlya Dryomov } 4071de322263SIlya Dryomov 4072de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4073de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4074de322263SIlya Dryomov ret = -ENOTCONN; 4075de322263SIlya Dryomov goto out_bargs; 4076de322263SIlya Dryomov } 4077de322263SIlya Dryomov 4078de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4079de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4080de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4081de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4082de322263SIlya Dryomov 4083de322263SIlya Dryomov goto do_balance; 4084de322263SIlya Dryomov } 4085c9e9f97bSIlya Dryomov } else { 4086c9e9f97bSIlya Dryomov bargs = NULL; 4087c9e9f97bSIlya Dryomov } 4088c9e9f97bSIlya Dryomov 4089ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4090837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4091837d5b6eSIlya Dryomov goto out_bargs; 4092837d5b6eSIlya Dryomov } 4093837d5b6eSIlya Dryomov 40948d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4095c9e9f97bSIlya Dryomov if (!bctl) { 4096c9e9f97bSIlya Dryomov ret = -ENOMEM; 4097c9e9f97bSIlya Dryomov goto out_bargs; 4098c9e9f97bSIlya Dryomov } 4099c9e9f97bSIlya Dryomov 4100c9e9f97bSIlya Dryomov if (arg) { 4101c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4102c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4103c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4104c9e9f97bSIlya Dryomov 4105c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4106f43ffb60SIlya Dryomov } else { 4107f43ffb60SIlya Dryomov /* balance everything - no filters */ 4108f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4109c9e9f97bSIlya Dryomov } 4110c9e9f97bSIlya Dryomov 41118eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41128eb93459SDavid Sterba ret = -EINVAL; 41130f89abf5SChristian Engelmayer goto out_bctl; 41148eb93459SDavid Sterba } 41158eb93459SDavid Sterba 4116de322263SIlya Dryomov do_balance: 4117c9e9f97bSIlya Dryomov /* 4118c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4119c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4120c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4121c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4122c9e9f97bSIlya Dryomov */ 4123ed0fb78fSIlya Dryomov need_unlock = false; 4124ed0fb78fSIlya Dryomov 41256fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41260f89abf5SChristian Engelmayer bctl = NULL; 4127ed0fb78fSIlya Dryomov 4128d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4129c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4130c9e9f97bSIlya Dryomov ret = -EFAULT; 4131c9e9f97bSIlya Dryomov } 4132c9e9f97bSIlya Dryomov 41330f89abf5SChristian Engelmayer out_bctl: 41340f89abf5SChristian Engelmayer kfree(bctl); 4135c9e9f97bSIlya Dryomov out_bargs: 4136c9e9f97bSIlya Dryomov kfree(bargs); 4137ed0fb78fSIlya Dryomov out_unlock: 4138c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4139ed0fb78fSIlya Dryomov if (need_unlock) 4140c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4141ed0fb78fSIlya Dryomov out: 4142e54bfa31SLiu Bo mnt_drop_write_file(file); 4143c9e9f97bSIlya Dryomov return ret; 4144c9e9f97bSIlya Dryomov } 4145c9e9f97bSIlya Dryomov 41462ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4147837d5b6eSIlya Dryomov { 4148837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4149837d5b6eSIlya Dryomov return -EPERM; 4150837d5b6eSIlya Dryomov 4151837d5b6eSIlya Dryomov switch (cmd) { 4152837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41530b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4154a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41550b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4156837d5b6eSIlya Dryomov } 4157837d5b6eSIlya Dryomov 4158837d5b6eSIlya Dryomov return -EINVAL; 4159837d5b6eSIlya Dryomov } 4160837d5b6eSIlya Dryomov 41612ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 416219a39dceSIlya Dryomov void __user *arg) 416319a39dceSIlya Dryomov { 416419a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 416519a39dceSIlya Dryomov int ret = 0; 416619a39dceSIlya Dryomov 416719a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 416819a39dceSIlya Dryomov return -EPERM; 416919a39dceSIlya Dryomov 417019a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 417119a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 417219a39dceSIlya Dryomov ret = -ENOTCONN; 417319a39dceSIlya Dryomov goto out; 417419a39dceSIlya Dryomov } 417519a39dceSIlya Dryomov 41768d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 417719a39dceSIlya Dryomov if (!bargs) { 417819a39dceSIlya Dryomov ret = -ENOMEM; 417919a39dceSIlya Dryomov goto out; 418019a39dceSIlya Dryomov } 418119a39dceSIlya Dryomov 4182008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 418319a39dceSIlya Dryomov 418419a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 418519a39dceSIlya Dryomov ret = -EFAULT; 418619a39dceSIlya Dryomov 418719a39dceSIlya Dryomov kfree(bargs); 418819a39dceSIlya Dryomov out: 418919a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 419019a39dceSIlya Dryomov return ret; 419119a39dceSIlya Dryomov } 419219a39dceSIlya Dryomov 4193905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41945d13a37bSArne Jansen { 41950b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41975d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41985d13a37bSArne Jansen int ret; 41995d13a37bSArne Jansen 42005d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42015d13a37bSArne Jansen return -EPERM; 42025d13a37bSArne Jansen 4203905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4204905b0ddaSMiao Xie if (ret) 4205905b0ddaSMiao Xie return ret; 42065d13a37bSArne Jansen 42075d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4208905b0ddaSMiao Xie if (IS_ERR(sa)) { 4209905b0ddaSMiao Xie ret = PTR_ERR(sa); 4210905b0ddaSMiao Xie goto drop_write; 4211905b0ddaSMiao Xie } 42125d13a37bSArne Jansen 42130b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42145d13a37bSArne Jansen 42155d13a37bSArne Jansen switch (sa->cmd) { 42165d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4217340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42185d13a37bSArne Jansen break; 42195d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4220340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42215d13a37bSArne Jansen break; 42225d13a37bSArne Jansen default: 42235d13a37bSArne Jansen ret = -EINVAL; 42245d13a37bSArne Jansen break; 42255d13a37bSArne Jansen } 42265d13a37bSArne Jansen 42275d13a37bSArne Jansen kfree(sa); 42280b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4229905b0ddaSMiao Xie drop_write: 4230905b0ddaSMiao Xie mnt_drop_write_file(file); 42315d13a37bSArne Jansen return ret; 42325d13a37bSArne Jansen } 42335d13a37bSArne Jansen 4234905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42355d13a37bSArne Jansen { 42360b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42370b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42380b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42415d13a37bSArne Jansen int ret; 42425d13a37bSArne Jansen int err; 42435d13a37bSArne Jansen 42445d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42455d13a37bSArne Jansen return -EPERM; 42465d13a37bSArne Jansen 4247905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4248905b0ddaSMiao Xie if (ret) 4249905b0ddaSMiao Xie return ret; 42505d13a37bSArne Jansen 42515d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4252905b0ddaSMiao Xie if (IS_ERR(sa)) { 4253905b0ddaSMiao Xie ret = PTR_ERR(sa); 4254905b0ddaSMiao Xie goto drop_write; 4255905b0ddaSMiao Xie } 42565d13a37bSArne Jansen 42575d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42585d13a37bSArne Jansen if (IS_ERR(trans)) { 42595d13a37bSArne Jansen ret = PTR_ERR(trans); 42605d13a37bSArne Jansen goto out; 42615d13a37bSArne Jansen } 42625d13a37bSArne Jansen 42635d13a37bSArne Jansen if (sa->assign) { 42649f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42655d13a37bSArne Jansen } else { 426639616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42675d13a37bSArne Jansen } 42685d13a37bSArne Jansen 4269e082f563SQu Wenruo /* update qgroup status and info */ 4270280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4271e082f563SQu Wenruo if (err < 0) 42720b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4273ad8403dfSAnand Jain "failed to update qgroup status and info"); 42743a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42755d13a37bSArne Jansen if (err && !ret) 42765d13a37bSArne Jansen ret = err; 42775d13a37bSArne Jansen 42785d13a37bSArne Jansen out: 42795d13a37bSArne Jansen kfree(sa); 4280905b0ddaSMiao Xie drop_write: 4281905b0ddaSMiao Xie mnt_drop_write_file(file); 42825d13a37bSArne Jansen return ret; 42835d13a37bSArne Jansen } 42845d13a37bSArne Jansen 4285905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42865d13a37bSArne Jansen { 42870b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42880b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42895d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42905d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42915d13a37bSArne Jansen int ret; 42925d13a37bSArne Jansen int err; 42935d13a37bSArne Jansen 42945d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42955d13a37bSArne Jansen return -EPERM; 42965d13a37bSArne Jansen 4297905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4298905b0ddaSMiao Xie if (ret) 4299905b0ddaSMiao Xie return ret; 43005d13a37bSArne Jansen 43015d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4302905b0ddaSMiao Xie if (IS_ERR(sa)) { 4303905b0ddaSMiao Xie ret = PTR_ERR(sa); 4304905b0ddaSMiao Xie goto drop_write; 4305905b0ddaSMiao Xie } 43065d13a37bSArne Jansen 4307d86e56cfSMiao Xie if (!sa->qgroupid) { 4308d86e56cfSMiao Xie ret = -EINVAL; 4309d86e56cfSMiao Xie goto out; 4310d86e56cfSMiao Xie } 4311d86e56cfSMiao Xie 43125d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43135d13a37bSArne Jansen if (IS_ERR(trans)) { 43145d13a37bSArne Jansen ret = PTR_ERR(trans); 43155d13a37bSArne Jansen goto out; 43165d13a37bSArne Jansen } 43175d13a37bSArne Jansen 43185d13a37bSArne Jansen if (sa->create) { 431949a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43205d13a37bSArne Jansen } else { 43213efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43225d13a37bSArne Jansen } 43235d13a37bSArne Jansen 43243a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43255d13a37bSArne Jansen if (err && !ret) 43265d13a37bSArne Jansen ret = err; 43275d13a37bSArne Jansen 43285d13a37bSArne Jansen out: 43295d13a37bSArne Jansen kfree(sa); 4330905b0ddaSMiao Xie drop_write: 4331905b0ddaSMiao Xie mnt_drop_write_file(file); 43325d13a37bSArne Jansen return ret; 43335d13a37bSArne Jansen } 43345d13a37bSArne Jansen 4335905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43365d13a37bSArne Jansen { 43370b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43380b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43395d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43405d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43415d13a37bSArne Jansen int ret; 43425d13a37bSArne Jansen int err; 43435d13a37bSArne Jansen u64 qgroupid; 43445d13a37bSArne Jansen 43455d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43465d13a37bSArne Jansen return -EPERM; 43475d13a37bSArne Jansen 4348905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4349905b0ddaSMiao Xie if (ret) 4350905b0ddaSMiao Xie return ret; 43515d13a37bSArne Jansen 43525d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4353905b0ddaSMiao Xie if (IS_ERR(sa)) { 4354905b0ddaSMiao Xie ret = PTR_ERR(sa); 4355905b0ddaSMiao Xie goto drop_write; 4356905b0ddaSMiao Xie } 43575d13a37bSArne Jansen 43585d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43595d13a37bSArne Jansen if (IS_ERR(trans)) { 43605d13a37bSArne Jansen ret = PTR_ERR(trans); 43615d13a37bSArne Jansen goto out; 43625d13a37bSArne Jansen } 43635d13a37bSArne Jansen 43645d13a37bSArne Jansen qgroupid = sa->qgroupid; 43655d13a37bSArne Jansen if (!qgroupid) { 43665d13a37bSArne Jansen /* take the current subvol as qgroup */ 43675d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43685d13a37bSArne Jansen } 43695d13a37bSArne Jansen 4370f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43715d13a37bSArne Jansen 43723a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43735d13a37bSArne Jansen if (err && !ret) 43745d13a37bSArne Jansen ret = err; 43755d13a37bSArne Jansen 43765d13a37bSArne Jansen out: 43775d13a37bSArne Jansen kfree(sa); 4378905b0ddaSMiao Xie drop_write: 4379905b0ddaSMiao Xie mnt_drop_write_file(file); 43805d13a37bSArne Jansen return ret; 43815d13a37bSArne Jansen } 43825d13a37bSArne Jansen 43832f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43842f232036SJan Schmidt { 43850b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43872f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43882f232036SJan Schmidt int ret; 43892f232036SJan Schmidt 43902f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43912f232036SJan Schmidt return -EPERM; 43922f232036SJan Schmidt 43932f232036SJan Schmidt ret = mnt_want_write_file(file); 43942f232036SJan Schmidt if (ret) 43952f232036SJan Schmidt return ret; 43962f232036SJan Schmidt 43972f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43982f232036SJan Schmidt if (IS_ERR(qsa)) { 43992f232036SJan Schmidt ret = PTR_ERR(qsa); 44002f232036SJan Schmidt goto drop_write; 44012f232036SJan Schmidt } 44022f232036SJan Schmidt 44032f232036SJan Schmidt if (qsa->flags) { 44042f232036SJan Schmidt ret = -EINVAL; 44052f232036SJan Schmidt goto out; 44062f232036SJan Schmidt } 44072f232036SJan Schmidt 44080b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44092f232036SJan Schmidt 44102f232036SJan Schmidt out: 44112f232036SJan Schmidt kfree(qsa); 44122f232036SJan Schmidt drop_write: 44132f232036SJan Schmidt mnt_drop_write_file(file); 44142f232036SJan Schmidt return ret; 44152f232036SJan Schmidt } 44162f232036SJan Schmidt 4417b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4418b929c1d8SMarcos Paulo de Souza void __user *arg) 44192f232036SJan Schmidt { 44202f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44212f232036SJan Schmidt int ret = 0; 44222f232036SJan Schmidt 44232f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44242f232036SJan Schmidt return -EPERM; 44252f232036SJan Schmidt 44268d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44272f232036SJan Schmidt if (!qsa) 44282f232036SJan Schmidt return -ENOMEM; 44292f232036SJan Schmidt 44300b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44312f232036SJan Schmidt qsa->flags = 1; 44320b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44332f232036SJan Schmidt } 44342f232036SJan Schmidt 44352f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44362f232036SJan Schmidt ret = -EFAULT; 44372f232036SJan Schmidt 44382f232036SJan Schmidt kfree(qsa); 44392f232036SJan Schmidt return ret; 44402f232036SJan Schmidt } 44412f232036SJan Schmidt 4442b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4443b929c1d8SMarcos Paulo de Souza void __user *arg) 444457254b6eSJan Schmidt { 444557254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 444657254b6eSJan Schmidt return -EPERM; 444757254b6eSJan Schmidt 44480b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 444957254b6eSJan Schmidt } 445057254b6eSJan Schmidt 4451abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4452abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44538ea05e3aSAlexander Block { 4454496ad9aaSAl Viro struct inode *inode = file_inode(file); 44550b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44568ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44578ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44588ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 445995582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44608ea05e3aSAlexander Block int ret = 0; 4461dd5f9615SStefan Behrens int received_uuid_changed; 44628ea05e3aSAlexander Block 4463bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4464bd60ea0fSDavid Sterba return -EPERM; 4465bd60ea0fSDavid Sterba 44668ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44678ea05e3aSAlexander Block if (ret < 0) 44688ea05e3aSAlexander Block return ret; 44698ea05e3aSAlexander Block 44700b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44718ea05e3aSAlexander Block 44724a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44738ea05e3aSAlexander Block ret = -EINVAL; 44748ea05e3aSAlexander Block goto out; 44758ea05e3aSAlexander Block } 44768ea05e3aSAlexander Block 44778ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44788ea05e3aSAlexander Block ret = -EROFS; 44798ea05e3aSAlexander Block goto out; 44808ea05e3aSAlexander Block } 44818ea05e3aSAlexander Block 4482dd5f9615SStefan Behrens /* 4483dd5f9615SStefan Behrens * 1 - root item 4484dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4485dd5f9615SStefan Behrens */ 4486dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44878ea05e3aSAlexander Block if (IS_ERR(trans)) { 44888ea05e3aSAlexander Block ret = PTR_ERR(trans); 44898ea05e3aSAlexander Block trans = NULL; 44908ea05e3aSAlexander Block goto out; 44918ea05e3aSAlexander Block } 44928ea05e3aSAlexander Block 44938ea05e3aSAlexander Block sa->rtransid = trans->transid; 44948ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44958ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44968ea05e3aSAlexander Block 4497dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4498dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4499dd5f9615SStefan Behrens if (received_uuid_changed && 4500d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4501d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4502dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4503dd5f9615SStefan Behrens root->root_key.objectid); 4504d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4505d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4506d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4507d87ff758SNikolay Borisov goto out; 4508d87ff758SNikolay Borisov } 4509d87ff758SNikolay Borisov } 45108ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45118ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45128ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45133cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45143cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45153cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45163cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45178ea05e3aSAlexander Block 45180b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45198ea05e3aSAlexander Block &root->root_key, &root->root_item); 45208ea05e3aSAlexander Block if (ret < 0) { 45213a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45228ea05e3aSAlexander Block goto out; 4523dd5f9615SStefan Behrens } 4524dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4525cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4526dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4527dd5f9615SStefan Behrens root->root_key.objectid); 4528dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 452966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4530efd38150SNikolay Borisov btrfs_end_transaction(trans); 4531dd5f9615SStefan Behrens goto out; 4532dd5f9615SStefan Behrens } 4533dd5f9615SStefan Behrens } 45343a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4535abccd00fSHugo Mills out: 45360b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4537abccd00fSHugo Mills mnt_drop_write_file(file); 4538abccd00fSHugo Mills return ret; 4539abccd00fSHugo Mills } 4540abccd00fSHugo Mills 4541abccd00fSHugo Mills #ifdef CONFIG_64BIT 4542abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4543abccd00fSHugo Mills void __user *arg) 4544abccd00fSHugo Mills { 4545abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4546abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4547abccd00fSHugo Mills int ret = 0; 4548abccd00fSHugo Mills 4549abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45507b9ea627SShailendra Verma if (IS_ERR(args32)) 45517b9ea627SShailendra Verma return PTR_ERR(args32); 4552abccd00fSHugo Mills 45538d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 455484dbeb87SDan Carpenter if (!args64) { 455584dbeb87SDan Carpenter ret = -ENOMEM; 4556abccd00fSHugo Mills goto out; 4557abccd00fSHugo Mills } 4558abccd00fSHugo Mills 4559abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4560abccd00fSHugo Mills args64->stransid = args32->stransid; 4561abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4562abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4563abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4564abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4565abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4566abccd00fSHugo Mills args64->flags = args32->flags; 4567abccd00fSHugo Mills 4568abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4569abccd00fSHugo Mills if (ret) 4570abccd00fSHugo Mills goto out; 4571abccd00fSHugo Mills 4572abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4573abccd00fSHugo Mills args32->stransid = args64->stransid; 4574abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4575abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4576abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4577abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4578abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4579abccd00fSHugo Mills args32->flags = args64->flags; 4580abccd00fSHugo Mills 4581abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4582abccd00fSHugo Mills if (ret) 4583abccd00fSHugo Mills ret = -EFAULT; 4584abccd00fSHugo Mills 4585abccd00fSHugo Mills out: 4586abccd00fSHugo Mills kfree(args32); 4587abccd00fSHugo Mills kfree(args64); 4588abccd00fSHugo Mills return ret; 4589abccd00fSHugo Mills } 4590abccd00fSHugo Mills #endif 4591abccd00fSHugo Mills 4592abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4593abccd00fSHugo Mills void __user *arg) 4594abccd00fSHugo Mills { 4595abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4596abccd00fSHugo Mills int ret = 0; 4597abccd00fSHugo Mills 4598abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45997b9ea627SShailendra Verma if (IS_ERR(sa)) 46007b9ea627SShailendra Verma return PTR_ERR(sa); 4601abccd00fSHugo Mills 4602abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4603abccd00fSHugo Mills 4604abccd00fSHugo Mills if (ret) 4605abccd00fSHugo Mills goto out; 4606abccd00fSHugo Mills 46078ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46088ea05e3aSAlexander Block if (ret) 46098ea05e3aSAlexander Block ret = -EFAULT; 46108ea05e3aSAlexander Block 46118ea05e3aSAlexander Block out: 46128ea05e3aSAlexander Block kfree(sa); 46138ea05e3aSAlexander Block return ret; 46148ea05e3aSAlexander Block } 46158ea05e3aSAlexander Block 4616b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4617b929c1d8SMarcos Paulo de Souza void __user *arg) 4618867ab667Sjeff.liu { 4619a1b83ac5SAnand Jain size_t len; 4620867ab667Sjeff.liu int ret; 4621a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4622a1b83ac5SAnand Jain 46230b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46240b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46250b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4626a1b83ac5SAnand Jain 4627a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4628867ab667Sjeff.liu 4629867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46300b246afaSJeff Mahoney btrfs_warn(fs_info, 46310b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46320b246afaSJeff Mahoney --len); 4633867ab667Sjeff.liu } 4634867ab667Sjeff.liu 4635867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4636867ab667Sjeff.liu 4637867ab667Sjeff.liu return ret ? -EFAULT : 0; 4638867ab667Sjeff.liu } 4639867ab667Sjeff.liu 4640a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4641a8bfd4abSjeff.liu { 46420b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46430b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46440b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46450b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4646a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4647a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4648a8bfd4abSjeff.liu int ret; 4649a8bfd4abSjeff.liu 4650a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4651a8bfd4abSjeff.liu return -EPERM; 4652a8bfd4abSjeff.liu 4653a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4654a8bfd4abSjeff.liu return -EFAULT; 4655a8bfd4abSjeff.liu 4656a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46570b246afaSJeff Mahoney btrfs_err(fs_info, 46585d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4659a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4660a8bfd4abSjeff.liu return -EINVAL; 4661a8bfd4abSjeff.liu } 4662a8bfd4abSjeff.liu 4663a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4664a8bfd4abSjeff.liu if (ret) 4665a8bfd4abSjeff.liu return ret; 4666a8bfd4abSjeff.liu 4667a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4668a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4669a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4670a8bfd4abSjeff.liu goto out_unlock; 4671a8bfd4abSjeff.liu } 4672a8bfd4abSjeff.liu 46730b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4674a8bfd4abSjeff.liu strcpy(super_block->label, label); 46750b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46763a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4677a8bfd4abSjeff.liu 4678a8bfd4abSjeff.liu out_unlock: 4679a8bfd4abSjeff.liu mnt_drop_write_file(file); 4680a8bfd4abSjeff.liu return ret; 4681a8bfd4abSjeff.liu } 4682a8bfd4abSjeff.liu 46832eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46842eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46852eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46862eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46872eaa055fSJeff Mahoney 4688d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46892eaa055fSJeff Mahoney { 46904d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46912eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46922eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46932eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46942eaa055fSJeff Mahoney }; 46952eaa055fSJeff Mahoney 46962eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46972eaa055fSJeff Mahoney return -EFAULT; 46982eaa055fSJeff Mahoney 46992eaa055fSJeff Mahoney return 0; 47002eaa055fSJeff Mahoney } 47012eaa055fSJeff Mahoney 4702b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4703b929c1d8SMarcos Paulo de Souza void __user *arg) 47042eaa055fSJeff Mahoney { 47050b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47062eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 47072eaa055fSJeff Mahoney 47082eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47092eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47102eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47112eaa055fSJeff Mahoney 47122eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47132eaa055fSJeff Mahoney return -EFAULT; 47142eaa055fSJeff Mahoney 47152eaa055fSJeff Mahoney return 0; 47162eaa055fSJeff Mahoney } 47172eaa055fSJeff Mahoney 47182ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47193b02a68aSJeff Mahoney enum btrfs_feature_set set, 47202eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47212eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47222eaa055fSJeff Mahoney { 4723f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47243b02a68aSJeff Mahoney char *names; 47252eaa055fSJeff Mahoney u64 disallowed, unsupported; 47262eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47272eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47282eaa055fSJeff Mahoney 47292eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47302eaa055fSJeff Mahoney if (unsupported) { 47313b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47323b02a68aSJeff Mahoney if (names) { 47330b246afaSJeff Mahoney btrfs_warn(fs_info, 47343b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47353b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47363b02a68aSJeff Mahoney kfree(names); 47373b02a68aSJeff Mahoney } else 47380b246afaSJeff Mahoney btrfs_warn(fs_info, 47392eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47402eaa055fSJeff Mahoney type, unsupported); 47412eaa055fSJeff Mahoney return -EOPNOTSUPP; 47422eaa055fSJeff Mahoney } 47432eaa055fSJeff Mahoney 47442eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47452eaa055fSJeff Mahoney if (disallowed) { 47463b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47473b02a68aSJeff Mahoney if (names) { 47480b246afaSJeff Mahoney btrfs_warn(fs_info, 47493b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47503b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47513b02a68aSJeff Mahoney kfree(names); 47523b02a68aSJeff Mahoney } else 47530b246afaSJeff Mahoney btrfs_warn(fs_info, 47542eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47552eaa055fSJeff Mahoney type, disallowed); 47562eaa055fSJeff Mahoney return -EPERM; 47572eaa055fSJeff Mahoney } 47582eaa055fSJeff Mahoney 47592eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47602eaa055fSJeff Mahoney if (disallowed) { 47613b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47623b02a68aSJeff Mahoney if (names) { 47630b246afaSJeff Mahoney btrfs_warn(fs_info, 47643b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47653b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47663b02a68aSJeff Mahoney kfree(names); 47673b02a68aSJeff Mahoney } else 47680b246afaSJeff Mahoney btrfs_warn(fs_info, 47692eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47702eaa055fSJeff Mahoney type, disallowed); 47712eaa055fSJeff Mahoney return -EPERM; 47722eaa055fSJeff Mahoney } 47732eaa055fSJeff Mahoney 47742eaa055fSJeff Mahoney return 0; 47752eaa055fSJeff Mahoney } 47762eaa055fSJeff Mahoney 47772ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47782ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47792eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47802eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47812eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47822eaa055fSJeff Mahoney 47832eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47842eaa055fSJeff Mahoney { 47850b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47860b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47870b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47880b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47892eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47902eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47912eaa055fSJeff Mahoney u64 newflags; 47922eaa055fSJeff Mahoney int ret; 47932eaa055fSJeff Mahoney 47942eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47952eaa055fSJeff Mahoney return -EPERM; 47962eaa055fSJeff Mahoney 47972eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47982eaa055fSJeff Mahoney return -EFAULT; 47992eaa055fSJeff Mahoney 48002eaa055fSJeff Mahoney /* Nothing to do */ 48012eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 48022eaa055fSJeff Mahoney !flags[0].incompat_flags) 48032eaa055fSJeff Mahoney return 0; 48042eaa055fSJeff Mahoney 48052ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 48062eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 48072eaa055fSJeff Mahoney if (ret) 48082eaa055fSJeff Mahoney return ret; 48092eaa055fSJeff Mahoney 48102ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48112eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48122eaa055fSJeff Mahoney if (ret) 48132eaa055fSJeff Mahoney return ret; 48142eaa055fSJeff Mahoney 48152ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48162eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48172eaa055fSJeff Mahoney if (ret) 48182eaa055fSJeff Mahoney return ret; 48192eaa055fSJeff Mahoney 48207ab19625SDavid Sterba ret = mnt_want_write_file(file); 48217ab19625SDavid Sterba if (ret) 48227ab19625SDavid Sterba return ret; 48237ab19625SDavid Sterba 48248051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48257ab19625SDavid Sterba if (IS_ERR(trans)) { 48267ab19625SDavid Sterba ret = PTR_ERR(trans); 48277ab19625SDavid Sterba goto out_drop_write; 48287ab19625SDavid Sterba } 48292eaa055fSJeff Mahoney 48300b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48312eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48322eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48332eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48342eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48352eaa055fSJeff Mahoney 48362eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48372eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48382eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48392eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48402eaa055fSJeff Mahoney 48412eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48422eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48432eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48442eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48450b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48462eaa055fSJeff Mahoney 48473a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48487ab19625SDavid Sterba out_drop_write: 48497ab19625SDavid Sterba mnt_drop_write_file(file); 48507ab19625SDavid Sterba 48517ab19625SDavid Sterba return ret; 48522eaa055fSJeff Mahoney } 48532eaa055fSJeff Mahoney 48542351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48552351f431SJosef Bacik { 48562351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48572351f431SJosef Bacik int ret; 48582351f431SJosef Bacik 48592351f431SJosef Bacik if (compat) { 48602351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48612351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48622351f431SJosef Bacik 48632351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48642351f431SJosef Bacik if (ret) 48652351f431SJosef Bacik return -EFAULT; 48662351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48672351f431SJosef Bacik if (!arg) 48682351f431SJosef Bacik return -ENOMEM; 48692351f431SJosef Bacik arg->send_fd = args32.send_fd; 48702351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48712351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48722351f431SJosef Bacik arg->parent_root = args32.parent_root; 48732351f431SJosef Bacik arg->flags = args32.flags; 48742351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48752351f431SJosef Bacik sizeof(args32.reserved)); 48762351f431SJosef Bacik #else 48772351f431SJosef Bacik return -ENOTTY; 48782351f431SJosef Bacik #endif 48792351f431SJosef Bacik } else { 48802351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48812351f431SJosef Bacik if (IS_ERR(arg)) 48822351f431SJosef Bacik return PTR_ERR(arg); 48832351f431SJosef Bacik } 48842351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48852351f431SJosef Bacik kfree(arg); 48862351f431SJosef Bacik return ret; 48872351f431SJosef Bacik } 48882351f431SJosef Bacik 4889f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4890f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4891f46b5a66SChristoph Hellwig { 48920b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48930b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48940b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48954bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4896f46b5a66SChristoph Hellwig 4897f46b5a66SChristoph Hellwig switch (cmd) { 48986cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48996cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 49006cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 49016cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 49026cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 49036cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 490440cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4905b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 490640cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 490740cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4908f7039b1dSLi Dongyang case FITRIM: 4909b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4910f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4911fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4912fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4913fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49143de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4915fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49166f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49176f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 491876dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4919949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4920949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4921949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49220caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49230caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49240caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49250caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49266ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49276ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4928f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49291e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49301e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49311e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4932f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4933198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4934f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49352ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4936f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4937da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49386b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49396b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4940475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49412ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4942475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49432ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4944f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49459ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4946ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4947ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4948cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4949cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4950ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4951ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4952d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4953d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4954d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4955d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4956d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4957d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49581406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49592ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49609b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49619b199859SFilipe David Borba Manana int ret; 49629b199859SFilipe David Borba Manana 49639db4dc24SNikolay Borisov ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); 49649b199859SFilipe David Borba Manana if (ret) 49659b199859SFilipe David Borba Manana return ret; 49660b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49672fad4e83SDavid Sterba /* 49682fad4e83SDavid Sterba * The transaction thread may want to do more work, 496901327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49702fad4e83SDavid Sterba * processing uncleaned subvols. 49712fad4e83SDavid Sterba */ 49720b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49739b199859SFilipe David Borba Manana return ret; 49749b199859SFilipe David Borba Manana } 497546204592SSage Weil case BTRFS_IOC_START_SYNC: 49769a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 497746204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49782ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4979475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4980b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4981475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49822ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4983475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49842ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4985c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49869ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4987837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49882ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 498919a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49902ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49918ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49928ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4993abccd00fSHugo Mills #ifdef CONFIG_64BIT 4994abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4995abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4996abccd00fSHugo Mills #endif 499731db9f7cSAlexander Block case BTRFS_IOC_SEND: 49982351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49992351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 50002351f431SJosef Bacik case BTRFS_IOC_SEND_32: 50012351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 50022351f431SJosef Bacik #endif 5003c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 50042ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 50055d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 5006905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 50075d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5008905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50095d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5010905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50115d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5012905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50132f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50142f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50152f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5016b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 501757254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5018b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50193f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50202ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50212eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5022d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50232eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5024b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50252eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50262eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5027e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5028e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5029025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5030025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5031b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5032b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 503342e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 503442e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 503523d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 503623d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5037f46b5a66SChristoph Hellwig } 5038f46b5a66SChristoph Hellwig 5039f46b5a66SChristoph Hellwig return -ENOTTY; 5040f46b5a66SChristoph Hellwig } 50414c63c245SLuke Dashjr 50424c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50434c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50444c63c245SLuke Dashjr { 50452a362249SJeff Mahoney /* 50462a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50472a362249SJeff Mahoney * handling is necessary. 50482a362249SJeff Mahoney */ 50494c63c245SLuke Dashjr switch (cmd) { 50504c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 50514c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 50524c63c245SLuke Dashjr break; 50534c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 50544c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 50554c63c245SLuke Dashjr break; 50564c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50574c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50584c63c245SLuke Dashjr break; 50594c63c245SLuke Dashjr } 50604c63c245SLuke Dashjr 50614c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50624c63c245SLuke Dashjr } 50634c63c245SLuke Dashjr #endif 5064