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" 37581bb050SLi Zefan #include "inode-map.h" 38d7728c96SJan Schmidt #include "backref.h" 39606686eeSJosef Bacik #include "rcu-string.h" 4031db9f7cSAlexander Block #include "send.h" 413f6bcfbdSStefan Behrens #include "dev-replace.h" 4263541927SFilipe David Borba Manana #include "props.h" 433b02a68aSJeff Mahoney #include "sysfs.h" 44fcebe456SJosef Bacik #include "qgroup.h" 451ec9a1aeSFilipe Manana #include "tree-log.h" 46ebb8765bSAnand Jain #include "compression.h" 478719aaaeSJosef Bacik #include "space-info.h" 4886736342SJosef Bacik #include "delalloc-space.h" 49aac0023cSJosef Bacik #include "block-group.h" 50f46b5a66SChristoph Hellwig 51abccd00fSHugo Mills #ifdef CONFIG_64BIT 52abccd00fSHugo Mills /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI 53abccd00fSHugo Mills * structures are incorrect, as the timespec structure from userspace 54abccd00fSHugo Mills * is 4 bytes too small. We define these alternatives here to teach 55abccd00fSHugo Mills * the kernel about the 32-bit struct packing. 56abccd00fSHugo Mills */ 57abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 { 58abccd00fSHugo Mills __u64 sec; 59abccd00fSHugo Mills __u32 nsec; 60abccd00fSHugo Mills } __attribute__ ((__packed__)); 61abccd00fSHugo Mills 62abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 { 63abccd00fSHugo Mills char uuid[BTRFS_UUID_SIZE]; /* in */ 64abccd00fSHugo Mills __u64 stransid; /* in */ 65abccd00fSHugo Mills __u64 rtransid; /* out */ 66abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 stime; /* in */ 67abccd00fSHugo Mills struct btrfs_ioctl_timespec_32 rtime; /* out */ 68abccd00fSHugo Mills __u64 flags; /* in */ 69abccd00fSHugo Mills __u64 reserved[16]; /* in */ 70abccd00fSHugo Mills } __attribute__ ((__packed__)); 71abccd00fSHugo Mills 72abccd00fSHugo Mills #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ 73abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32) 74abccd00fSHugo Mills #endif 75abccd00fSHugo Mills 762351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 772351f431SJosef Bacik struct btrfs_ioctl_send_args_32 { 782351f431SJosef Bacik __s64 send_fd; /* in */ 792351f431SJosef Bacik __u64 clone_sources_count; /* in */ 802351f431SJosef Bacik compat_uptr_t clone_sources; /* in */ 812351f431SJosef Bacik __u64 parent_root; /* in */ 822351f431SJosef Bacik __u64 flags; /* in */ 832351f431SJosef Bacik __u64 reserved[4]; /* in */ 842351f431SJosef Bacik } __attribute__ ((__packed__)); 852351f431SJosef Bacik 862351f431SJosef Bacik #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ 872351f431SJosef Bacik struct btrfs_ioctl_send_args_32) 882351f431SJosef Bacik #endif 89abccd00fSHugo Mills 906cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 911905a0f7SDavid Sterba static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, 921905a0f7SDavid Sterba unsigned int flags) 936cbff00fSChristoph Hellwig { 941905a0f7SDavid Sterba if (S_ISDIR(inode->i_mode)) 956cbff00fSChristoph Hellwig return flags; 961905a0f7SDavid Sterba else if (S_ISREG(inode->i_mode)) 976cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 986cbff00fSChristoph Hellwig else 996cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 1006cbff00fSChristoph Hellwig } 101f46b5a66SChristoph Hellwig 1026cbff00fSChristoph Hellwig /* 103a157d4fdSDavid Sterba * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS 104a157d4fdSDavid Sterba * ioctl. 1056cbff00fSChristoph Hellwig */ 106a157d4fdSDavid Sterba static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags) 1076cbff00fSChristoph Hellwig { 1086cbff00fSChristoph Hellwig unsigned int iflags = 0; 1096cbff00fSChristoph Hellwig 1106cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 1116cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 1126cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 1136cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 1146cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 1156cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 1166cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 1176cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 1186cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 1196cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 1206cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 1216cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 122d0092bddSLi Zefan if (flags & BTRFS_INODE_NODATACOW) 123d0092bddSLi Zefan iflags |= FS_NOCOW_FL; 124d0092bddSLi Zefan 12513f48dc9SSatoru Takeuchi if (flags & BTRFS_INODE_NOCOMPRESS) 126d0092bddSLi Zefan iflags |= FS_NOCOMP_FL; 12713f48dc9SSatoru Takeuchi else if (flags & BTRFS_INODE_COMPRESS) 12813f48dc9SSatoru Takeuchi iflags |= FS_COMPR_FL; 1296cbff00fSChristoph Hellwig 1306cbff00fSChristoph Hellwig return iflags; 1316cbff00fSChristoph Hellwig } 1326cbff00fSChristoph Hellwig 1336cbff00fSChristoph Hellwig /* 1346cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 1356cbff00fSChristoph Hellwig */ 1367b6a221eSDavid Sterba void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) 1376cbff00fSChristoph Hellwig { 1385c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 1393cc79392SFilipe Manana unsigned int new_fl = 0; 1406cbff00fSChristoph Hellwig 1415c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_SYNC) 1423cc79392SFilipe Manana new_fl |= S_SYNC; 1435c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_IMMUTABLE) 1443cc79392SFilipe Manana new_fl |= S_IMMUTABLE; 1455c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_APPEND) 1463cc79392SFilipe Manana new_fl |= S_APPEND; 1475c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_NOATIME) 1483cc79392SFilipe Manana new_fl |= S_NOATIME; 1495c57b8b6SDavid Sterba if (binode->flags & BTRFS_INODE_DIRSYNC) 1503cc79392SFilipe Manana new_fl |= S_DIRSYNC; 1513cc79392SFilipe Manana 1523cc79392SFilipe Manana set_mask_bits(&inode->i_flags, 1533cc79392SFilipe Manana S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, 1543cc79392SFilipe Manana new_fl); 1556cbff00fSChristoph Hellwig } 1566cbff00fSChristoph Hellwig 1576cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1586cbff00fSChristoph Hellwig { 1595c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 1605c57b8b6SDavid Sterba unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags); 1616cbff00fSChristoph Hellwig 1626cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1636cbff00fSChristoph Hellwig return -EFAULT; 1646cbff00fSChristoph Hellwig return 0; 1656cbff00fSChristoph Hellwig } 1666cbff00fSChristoph Hellwig 167f37c563bSDavid Sterba /* 168f37c563bSDavid Sterba * Check if @flags are a supported and valid set of FS_*_FL flags and that 169f37c563bSDavid Sterba * the old and new flags are not conflicting 170f37c563bSDavid Sterba */ 171f37c563bSDavid Sterba static int check_fsflags(unsigned int old_flags, unsigned int flags) 17275e7cb7fSLiu Bo { 17375e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 17475e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 17575e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 176e1e8fb6aSLi Zefan FS_NOCOMP_FL | FS_COMPR_FL | 177e1e8fb6aSLi Zefan FS_NOCOW_FL)) 17875e7cb7fSLiu Bo return -EOPNOTSUPP; 17975e7cb7fSLiu Bo 180f37c563bSDavid Sterba /* COMPR and NOCOMP on new/old are valid */ 18175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 18275e7cb7fSLiu Bo return -EINVAL; 18375e7cb7fSLiu Bo 184f37c563bSDavid Sterba if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) 185f37c563bSDavid Sterba return -EINVAL; 186f37c563bSDavid Sterba 187f37c563bSDavid Sterba /* NOCOW and compression options are mutually exclusive */ 188f37c563bSDavid Sterba if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 189f37c563bSDavid Sterba return -EINVAL; 190f37c563bSDavid Sterba if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) 191f37c563bSDavid Sterba return -EINVAL; 192f37c563bSDavid Sterba 19375e7cb7fSLiu Bo return 0; 19475e7cb7fSLiu Bo } 19575e7cb7fSLiu Bo 196*d206e9c9SNaohiro Aota static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, 197*d206e9c9SNaohiro Aota unsigned int flags) 198*d206e9c9SNaohiro Aota { 199*d206e9c9SNaohiro Aota if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) 200*d206e9c9SNaohiro Aota return -EPERM; 201*d206e9c9SNaohiro Aota 202*d206e9c9SNaohiro Aota return 0; 203*d206e9c9SNaohiro Aota } 204*d206e9c9SNaohiro Aota 2056cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 2066cbff00fSChristoph Hellwig { 207496ad9aaSAl Viro struct inode *inode = file_inode(file); 2080b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 2095c57b8b6SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 2105c57b8b6SDavid Sterba struct btrfs_root *root = binode->root; 2116cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 2125aca2842SDarrick J. Wong unsigned int fsflags, old_fsflags; 2136cbff00fSChristoph Hellwig int ret; 214ff9fef55SAnand Jain const char *comp = NULL; 215f37c563bSDavid Sterba u32 binode_flags; 2166cbff00fSChristoph Hellwig 217bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 218bd60ea0fSDavid Sterba return -EPERM; 219bd60ea0fSDavid Sterba 220b83cc969SLi Zefan if (btrfs_root_readonly(root)) 221b83cc969SLi Zefan return -EROFS; 222b83cc969SLi Zefan 2235c57b8b6SDavid Sterba if (copy_from_user(&fsflags, arg, sizeof(fsflags))) 2246cbff00fSChristoph Hellwig return -EFAULT; 2256cbff00fSChristoph Hellwig 226e7848683SJan Kara ret = mnt_want_write_file(file); 227e7848683SJan Kara if (ret) 228e7848683SJan Kara return ret; 229e7848683SJan Kara 2305955102cSAl Viro inode_lock(inode); 2315c57b8b6SDavid Sterba fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); 2325aca2842SDarrick J. Wong old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); 233f37c563bSDavid Sterba 2345aca2842SDarrick J. Wong ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags); 2355aca2842SDarrick J. Wong if (ret) 2366cbff00fSChristoph Hellwig goto out_unlock; 2376cbff00fSChristoph Hellwig 238f37c563bSDavid Sterba ret = check_fsflags(old_fsflags, fsflags); 239f37c563bSDavid Sterba if (ret) 240f37c563bSDavid Sterba goto out_unlock; 241f37c563bSDavid Sterba 242*d206e9c9SNaohiro Aota ret = check_fsflags_compatible(fs_info, fsflags); 243*d206e9c9SNaohiro Aota if (ret) 244*d206e9c9SNaohiro Aota goto out_unlock; 245*d206e9c9SNaohiro Aota 246f37c563bSDavid Sterba binode_flags = binode->flags; 2475c57b8b6SDavid Sterba if (fsflags & FS_SYNC_FL) 248d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_SYNC; 2496cbff00fSChristoph Hellwig else 250d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_SYNC; 2515c57b8b6SDavid Sterba if (fsflags & FS_IMMUTABLE_FL) 252d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_IMMUTABLE; 2536cbff00fSChristoph Hellwig else 254d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_IMMUTABLE; 2555c57b8b6SDavid Sterba if (fsflags & FS_APPEND_FL) 256d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_APPEND; 2576cbff00fSChristoph Hellwig else 258d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_APPEND; 2595c57b8b6SDavid Sterba if (fsflags & FS_NODUMP_FL) 260d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODUMP; 2616cbff00fSChristoph Hellwig else 262d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODUMP; 2635c57b8b6SDavid Sterba if (fsflags & FS_NOATIME_FL) 264d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOATIME; 2656cbff00fSChristoph Hellwig else 266d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOATIME; 2675c57b8b6SDavid Sterba if (fsflags & FS_DIRSYNC_FL) 268d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_DIRSYNC; 2696cbff00fSChristoph Hellwig else 270d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_DIRSYNC; 2715c57b8b6SDavid Sterba if (fsflags & FS_NOCOW_FL) { 27244e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2737e97b8daSDavid Sterba /* 2747e97b8daSDavid Sterba * It's safe to turn csums off here, no extents exist. 2757e97b8daSDavid Sterba * Otherwise we want the flag to reflect the real COW 2767e97b8daSDavid Sterba * status of the file and will not set it. 2777e97b8daSDavid Sterba */ 2787e97b8daSDavid Sterba if (inode->i_size == 0) 279d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW | 280d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM; 2817e97b8daSDavid Sterba } else { 282d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NODATACOW; 2837e97b8daSDavid Sterba } 2847e97b8daSDavid Sterba } else { 2857e97b8daSDavid Sterba /* 28601327610SNicholas D Steeves * Revert back under same assumptions as above 2877e97b8daSDavid Sterba */ 28844e5194bSAnand Jain if (S_ISREG(inode->i_mode)) { 2897e97b8daSDavid Sterba if (inode->i_size == 0) 290d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_NODATACOW | 291d2b8fcfeSAnand Jain BTRFS_INODE_NODATASUM); 2927e97b8daSDavid Sterba } else { 293d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NODATACOW; 2947e97b8daSDavid Sterba } 2957e97b8daSDavid Sterba } 2966cbff00fSChristoph Hellwig 29775e7cb7fSLiu Bo /* 29875e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 29975e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 30075e7cb7fSLiu Bo * things smaller. 30175e7cb7fSLiu Bo */ 3025c57b8b6SDavid Sterba if (fsflags & FS_NOCOMP_FL) { 303d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_COMPRESS; 304d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_NOCOMPRESS; 3055c57b8b6SDavid Sterba } else if (fsflags & FS_COMPR_FL) { 30663541927SFilipe David Borba Manana 307eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 308eede2bf3SOmar Sandoval ret = -ETXTBSY; 309eede2bf3SOmar Sandoval goto out_unlock; 310eede2bf3SOmar Sandoval } 311eede2bf3SOmar Sandoval 312d2b8fcfeSAnand Jain binode_flags |= BTRFS_INODE_COMPRESS; 313d2b8fcfeSAnand Jain binode_flags &= ~BTRFS_INODE_NOCOMPRESS; 31463541927SFilipe David Borba Manana 31593370509SDavid Sterba comp = btrfs_compress_type2str(fs_info->compress_type); 31693370509SDavid Sterba if (!comp || comp[0] == 0) 31793370509SDavid Sterba comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); 318ebcb904dSLi Zefan } else { 319d2b8fcfeSAnand Jain binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); 32075e7cb7fSLiu Bo } 3216cbff00fSChristoph Hellwig 322ff9fef55SAnand Jain /* 323ff9fef55SAnand Jain * 1 for inode item 324ff9fef55SAnand Jain * 2 for properties 325ff9fef55SAnand Jain */ 326ff9fef55SAnand Jain trans = btrfs_start_transaction(root, 3); 327f062abf0SLi Zefan if (IS_ERR(trans)) { 328f062abf0SLi Zefan ret = PTR_ERR(trans); 329d2b8fcfeSAnand Jain goto out_unlock; 330f062abf0SLi Zefan } 3316cbff00fSChristoph Hellwig 332ff9fef55SAnand Jain if (comp) { 333ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, 334ff9fef55SAnand Jain strlen(comp), 0); 335ff9fef55SAnand Jain if (ret) { 336ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 337ff9fef55SAnand Jain goto out_end_trans; 338ff9fef55SAnand Jain } 339ff9fef55SAnand Jain } else { 340ff9fef55SAnand Jain ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, 341ff9fef55SAnand Jain 0, 0); 342ff9fef55SAnand Jain if (ret && ret != -ENODATA) { 343ff9fef55SAnand Jain btrfs_abort_transaction(trans, ret); 344ff9fef55SAnand Jain goto out_end_trans; 345ff9fef55SAnand Jain } 346ff9fef55SAnand Jain } 347ff9fef55SAnand Jain 348d2b8fcfeSAnand Jain binode->flags = binode_flags; 3497b6a221eSDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 3500c4d2d95SJosef Bacik inode_inc_iversion(inode); 351c2050a45SDeepa Dinamani inode->i_ctime = current_time(inode); 3529a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 3536cbff00fSChristoph Hellwig 354ff9fef55SAnand Jain out_end_trans: 3553a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3566cbff00fSChristoph Hellwig out_unlock: 3575955102cSAl Viro inode_unlock(inode); 358e7848683SJan Kara mnt_drop_write_file(file); 3592d4e6f6aSliubo return ret; 3606cbff00fSChristoph Hellwig } 3616cbff00fSChristoph Hellwig 36219f93b3cSDavid Sterba /* 36319f93b3cSDavid Sterba * Translate btrfs internal inode flags to xflags as expected by the 36419f93b3cSDavid Sterba * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are 36519f93b3cSDavid Sterba * silently dropped. 36619f93b3cSDavid Sterba */ 36719f93b3cSDavid Sterba static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) 36819f93b3cSDavid Sterba { 36919f93b3cSDavid Sterba unsigned int xflags = 0; 37019f93b3cSDavid Sterba 37119f93b3cSDavid Sterba if (flags & BTRFS_INODE_APPEND) 37219f93b3cSDavid Sterba xflags |= FS_XFLAG_APPEND; 37319f93b3cSDavid Sterba if (flags & BTRFS_INODE_IMMUTABLE) 37419f93b3cSDavid Sterba xflags |= FS_XFLAG_IMMUTABLE; 37519f93b3cSDavid Sterba if (flags & BTRFS_INODE_NOATIME) 37619f93b3cSDavid Sterba xflags |= FS_XFLAG_NOATIME; 37719f93b3cSDavid Sterba if (flags & BTRFS_INODE_NODUMP) 37819f93b3cSDavid Sterba xflags |= FS_XFLAG_NODUMP; 37919f93b3cSDavid Sterba if (flags & BTRFS_INODE_SYNC) 38019f93b3cSDavid Sterba xflags |= FS_XFLAG_SYNC; 38119f93b3cSDavid Sterba 38219f93b3cSDavid Sterba return xflags; 38319f93b3cSDavid Sterba } 38419f93b3cSDavid Sterba 38519f93b3cSDavid Sterba /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ 38619f93b3cSDavid Sterba static int check_xflags(unsigned int flags) 38719f93b3cSDavid Sterba { 38819f93b3cSDavid Sterba if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | 38919f93b3cSDavid Sterba FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) 39019f93b3cSDavid Sterba return -EOPNOTSUPP; 39119f93b3cSDavid Sterba return 0; 39219f93b3cSDavid Sterba } 39319f93b3cSDavid Sterba 394c3e1f96cSGoldwyn Rodrigues bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, 395c3e1f96cSGoldwyn Rodrigues enum btrfs_exclusive_operation type) 396c3e1f96cSGoldwyn Rodrigues { 397c3e1f96cSGoldwyn Rodrigues return !cmpxchg(&fs_info->exclusive_operation, BTRFS_EXCLOP_NONE, type); 398c3e1f96cSGoldwyn Rodrigues } 399c3e1f96cSGoldwyn Rodrigues 400c3e1f96cSGoldwyn Rodrigues void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) 401c3e1f96cSGoldwyn Rodrigues { 402c3e1f96cSGoldwyn Rodrigues WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); 40366a2823cSGoldwyn Rodrigues sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); 404c3e1f96cSGoldwyn Rodrigues } 405c3e1f96cSGoldwyn Rodrigues 406e4202ac9SDavid Sterba /* 407e4202ac9SDavid Sterba * Set the xflags from the internal inode flags. The remaining items of fsxattr 408e4202ac9SDavid Sterba * are zeroed. 409e4202ac9SDavid Sterba */ 410e4202ac9SDavid Sterba static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg) 411e4202ac9SDavid Sterba { 412e4202ac9SDavid Sterba struct btrfs_inode *binode = BTRFS_I(file_inode(file)); 413e4202ac9SDavid Sterba struct fsxattr fa; 414e4202ac9SDavid Sterba 4157b0e492eSDarrick J. Wong simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags)); 416e4202ac9SDavid Sterba if (copy_to_user(arg, &fa, sizeof(fa))) 417e4202ac9SDavid Sterba return -EFAULT; 418e4202ac9SDavid Sterba 419e4202ac9SDavid Sterba return 0; 420e4202ac9SDavid Sterba } 421e4202ac9SDavid Sterba 422025f2121SDavid Sterba static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg) 423025f2121SDavid Sterba { 424025f2121SDavid Sterba struct inode *inode = file_inode(file); 425025f2121SDavid Sterba struct btrfs_inode *binode = BTRFS_I(inode); 426025f2121SDavid Sterba struct btrfs_root *root = binode->root; 427025f2121SDavid Sterba struct btrfs_trans_handle *trans; 4287b0e492eSDarrick J. Wong struct fsxattr fa, old_fa; 429025f2121SDavid Sterba unsigned old_flags; 430025f2121SDavid Sterba unsigned old_i_flags; 431025f2121SDavid Sterba int ret = 0; 432025f2121SDavid Sterba 433025f2121SDavid Sterba if (!inode_owner_or_capable(inode)) 434025f2121SDavid Sterba return -EPERM; 435025f2121SDavid Sterba 436025f2121SDavid Sterba if (btrfs_root_readonly(root)) 437025f2121SDavid Sterba return -EROFS; 438025f2121SDavid Sterba 439025f2121SDavid Sterba if (copy_from_user(&fa, arg, sizeof(fa))) 440025f2121SDavid Sterba return -EFAULT; 441025f2121SDavid Sterba 442025f2121SDavid Sterba ret = check_xflags(fa.fsx_xflags); 443025f2121SDavid Sterba if (ret) 444025f2121SDavid Sterba return ret; 445025f2121SDavid Sterba 446025f2121SDavid Sterba if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0) 447025f2121SDavid Sterba return -EOPNOTSUPP; 448025f2121SDavid Sterba 449025f2121SDavid Sterba ret = mnt_want_write_file(file); 450025f2121SDavid Sterba if (ret) 451025f2121SDavid Sterba return ret; 452025f2121SDavid Sterba 453025f2121SDavid Sterba inode_lock(inode); 454025f2121SDavid Sterba 455025f2121SDavid Sterba old_flags = binode->flags; 456025f2121SDavid Sterba old_i_flags = inode->i_flags; 457025f2121SDavid Sterba 4587b0e492eSDarrick J. Wong simple_fill_fsxattr(&old_fa, 4597b0e492eSDarrick J. Wong btrfs_inode_flags_to_xflags(binode->flags)); 4607b0e492eSDarrick J. Wong ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); 4617b0e492eSDarrick J. Wong if (ret) 462025f2121SDavid Sterba goto out_unlock; 463025f2121SDavid Sterba 464025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_SYNC) 465025f2121SDavid Sterba binode->flags |= BTRFS_INODE_SYNC; 466025f2121SDavid Sterba else 467025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_SYNC; 468025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE) 469025f2121SDavid Sterba binode->flags |= BTRFS_INODE_IMMUTABLE; 470025f2121SDavid Sterba else 471025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_IMMUTABLE; 472025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_APPEND) 473025f2121SDavid Sterba binode->flags |= BTRFS_INODE_APPEND; 474025f2121SDavid Sterba else 475025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_APPEND; 476025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NODUMP) 477025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NODUMP; 478025f2121SDavid Sterba else 479025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NODUMP; 480025f2121SDavid Sterba if (fa.fsx_xflags & FS_XFLAG_NOATIME) 481025f2121SDavid Sterba binode->flags |= BTRFS_INODE_NOATIME; 482025f2121SDavid Sterba else 483025f2121SDavid Sterba binode->flags &= ~BTRFS_INODE_NOATIME; 484025f2121SDavid Sterba 485025f2121SDavid Sterba /* 1 item for the inode */ 486025f2121SDavid Sterba trans = btrfs_start_transaction(root, 1); 487025f2121SDavid Sterba if (IS_ERR(trans)) { 488025f2121SDavid Sterba ret = PTR_ERR(trans); 489025f2121SDavid Sterba goto out_unlock; 490025f2121SDavid Sterba } 491025f2121SDavid Sterba 492025f2121SDavid Sterba btrfs_sync_inode_flags_to_i_flags(inode); 493025f2121SDavid Sterba inode_inc_iversion(inode); 494025f2121SDavid Sterba inode->i_ctime = current_time(inode); 4959a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 496025f2121SDavid Sterba 497025f2121SDavid Sterba btrfs_end_transaction(trans); 498025f2121SDavid Sterba 499025f2121SDavid Sterba out_unlock: 500025f2121SDavid Sterba if (ret) { 501025f2121SDavid Sterba binode->flags = old_flags; 502025f2121SDavid Sterba inode->i_flags = old_i_flags; 503025f2121SDavid Sterba } 504025f2121SDavid Sterba 505025f2121SDavid Sterba inode_unlock(inode); 506025f2121SDavid Sterba mnt_drop_write_file(file); 507025f2121SDavid Sterba 508025f2121SDavid Sterba return ret; 509025f2121SDavid Sterba } 510025f2121SDavid Sterba 5116cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 5126cbff00fSChristoph Hellwig { 513496ad9aaSAl Viro struct inode *inode = file_inode(file); 5146cbff00fSChristoph Hellwig 5156cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 5166cbff00fSChristoph Hellwig } 517f46b5a66SChristoph Hellwig 518b929c1d8SMarcos Paulo de Souza static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, 519b929c1d8SMarcos Paulo de Souza void __user *arg) 520f7039b1dSLi Dongyang { 521f7039b1dSLi Dongyang struct btrfs_device *device; 522f7039b1dSLi Dongyang struct request_queue *q; 523f7039b1dSLi Dongyang struct fstrim_range range; 524f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 525f7039b1dSLi Dongyang u64 num_devices = 0; 526f7039b1dSLi Dongyang int ret; 527f7039b1dSLi Dongyang 528f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 529f7039b1dSLi Dongyang return -EPERM; 530f7039b1dSLi Dongyang 531f35f06c3SFilipe Manana /* 532f35f06c3SFilipe Manana * If the fs is mounted with nologreplay, which requires it to be 533f35f06c3SFilipe Manana * mounted in RO mode as well, we can not allow discard on free space 534f35f06c3SFilipe Manana * inside block groups, because log trees refer to extents that are not 535f35f06c3SFilipe Manana * pinned in a block group's free space cache (pinning the extents is 536f35f06c3SFilipe Manana * precisely the first phase of replaying a log tree). 537f35f06c3SFilipe Manana */ 538f35f06c3SFilipe Manana if (btrfs_test_opt(fs_info, NOLOGREPLAY)) 539f35f06c3SFilipe Manana return -EROFS; 540f35f06c3SFilipe Manana 5411f78160cSXiao Guangrong rcu_read_lock(); 5421f78160cSXiao Guangrong list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, 5431f78160cSXiao Guangrong dev_list) { 544f7039b1dSLi Dongyang if (!device->bdev) 545f7039b1dSLi Dongyang continue; 546f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 547f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 548f7039b1dSLi Dongyang num_devices++; 54950d0446eSSeraphime Kirkovski minlen = min_t(u64, q->limits.discard_granularity, 550f7039b1dSLi Dongyang minlen); 551f7039b1dSLi Dongyang } 552f7039b1dSLi Dongyang } 5531f78160cSXiao Guangrong rcu_read_unlock(); 554f4c697e6SLukas Czerner 555f7039b1dSLi Dongyang if (!num_devices) 556f7039b1dSLi Dongyang return -EOPNOTSUPP; 557f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 558f7039b1dSLi Dongyang return -EFAULT; 5596ba9fc8eSQu Wenruo 5606ba9fc8eSQu Wenruo /* 5616ba9fc8eSQu Wenruo * NOTE: Don't truncate the range using super->total_bytes. Bytenr of 5626ba9fc8eSQu Wenruo * block group is in the logical address space, which can be any 5636ba9fc8eSQu Wenruo * sectorsize aligned bytenr in the range [0, U64_MAX]. 5646ba9fc8eSQu Wenruo */ 5656ba9fc8eSQu Wenruo if (range.len < fs_info->sb->s_blocksize) 566f4c697e6SLukas Czerner return -EINVAL; 567f7039b1dSLi Dongyang 568f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 5692ff7e61eSJeff Mahoney ret = btrfs_trim_fs(fs_info, &range); 570f7039b1dSLi Dongyang if (ret < 0) 571f7039b1dSLi Dongyang return ret; 572f7039b1dSLi Dongyang 573f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 574f7039b1dSLi Dongyang return -EFAULT; 575f7039b1dSLi Dongyang 576f7039b1dSLi Dongyang return 0; 577f7039b1dSLi Dongyang } 578f7039b1dSLi Dongyang 579e1f60a65SDavid Sterba int __pure btrfs_is_empty_uuid(u8 *uuid) 580dd5f9615SStefan Behrens { 58146e0f66aSChris Mason int i; 58246e0f66aSChris Mason 58346e0f66aSChris Mason for (i = 0; i < BTRFS_UUID_SIZE; i++) { 58446e0f66aSChris Mason if (uuid[i]) 58546e0f66aSChris Mason return 0; 58646e0f66aSChris Mason } 58746e0f66aSChris Mason return 1; 588dd5f9615SStefan Behrens } 589dd5f9615SStefan Behrens 590d5c12070SMiao Xie static noinline int create_subvol(struct inode *dir, 591cb8e7090SChristoph Hellwig struct dentry *dentry, 59252f75f4fSDavid Sterba const char *name, int namelen, 5938696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 594f46b5a66SChristoph Hellwig { 5950b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 596f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 597f46b5a66SChristoph Hellwig struct btrfs_key key; 59849a3c4d9SDavid Sterba struct btrfs_root_item *root_item; 599f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 600f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 601d5c12070SMiao Xie struct btrfs_root *root = BTRFS_I(dir)->root; 60276dda93cSYan, Zheng struct btrfs_root *new_root; 603d5c12070SMiao Xie struct btrfs_block_rsv block_rsv; 60495582b00SDeepa Dinamani struct timespec64 cur_time = current_time(dir); 6055662344bSTsutomu Itoh struct inode *inode; 606f46b5a66SChristoph Hellwig int ret; 607f46b5a66SChristoph Hellwig int err; 6082dfb1e43SQu Wenruo dev_t anon_dev = 0; 609f46b5a66SChristoph Hellwig u64 objectid; 610f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 6113de4586cSChris Mason u64 index = 0; 612f46b5a66SChristoph Hellwig 61349a3c4d9SDavid Sterba root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); 61449a3c4d9SDavid Sterba if (!root_item) 61549a3c4d9SDavid Sterba return -ENOMEM; 61649a3c4d9SDavid Sterba 6170b246afaSJeff Mahoney ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid); 6182fbe8c8aSAl Viro if (ret) 61949a3c4d9SDavid Sterba goto fail_free; 6206a912213SJosef Bacik 6212dfb1e43SQu Wenruo ret = get_anon_bdev(&anon_dev); 6222dfb1e43SQu Wenruo if (ret < 0) 6232dfb1e43SQu Wenruo goto fail_free; 6242dfb1e43SQu Wenruo 625e09fe2d2SQu Wenruo /* 626e09fe2d2SQu Wenruo * Don't create subvolume whose level is not zero. Or qgroup will be 62701327610SNicholas D Steeves * screwed up since it assumes subvolume qgroup's level to be 0. 628e09fe2d2SQu Wenruo */ 62949a3c4d9SDavid Sterba if (btrfs_qgroup_level(objectid)) { 63049a3c4d9SDavid Sterba ret = -ENOSPC; 63149a3c4d9SDavid Sterba goto fail_free; 63249a3c4d9SDavid Sterba } 633e09fe2d2SQu Wenruo 634d5c12070SMiao Xie btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); 6359ed74f2dSJosef Bacik /* 636d5c12070SMiao Xie * The same as the snapshot creation, please see the comment 637d5c12070SMiao Xie * of create_snapshot(). 6389ed74f2dSJosef Bacik */ 639c4c129dbSGu JinXiang ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); 640d5c12070SMiao Xie if (ret) 64149a3c4d9SDavid Sterba goto fail_free; 642f46b5a66SChristoph Hellwig 643d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 644d5c12070SMiao Xie if (IS_ERR(trans)) { 645d5c12070SMiao Xie ret = PTR_ERR(trans); 646e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 64749a3c4d9SDavid Sterba goto fail_free; 648d5c12070SMiao Xie } 649d5c12070SMiao Xie trans->block_rsv = &block_rsv; 650d5c12070SMiao Xie trans->bytes_reserved = block_rsv.size; 651f46b5a66SChristoph Hellwig 652a9377422SLu Fengqi ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); 6536f72c7e2SArne Jansen if (ret) 6546f72c7e2SArne Jansen goto fail; 6556f72c7e2SArne Jansen 6569631e4ccSJosef Bacik leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, 6579631e4ccSJosef Bacik BTRFS_NESTING_NORMAL); 6588e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 6598e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 6608e8a1e31SJosef Bacik goto fail; 6618e8a1e31SJosef Bacik } 662f46b5a66SChristoph Hellwig 663f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 664f46b5a66SChristoph Hellwig 66549a3c4d9SDavid Sterba inode_item = &root_item->inode; 6663cae210fSQu Wenruo btrfs_set_stack_inode_generation(inode_item, 1); 6673cae210fSQu Wenruo btrfs_set_stack_inode_size(inode_item, 3); 6683cae210fSQu Wenruo btrfs_set_stack_inode_nlink(inode_item, 1); 669da17066cSJeff Mahoney btrfs_set_stack_inode_nbytes(inode_item, 6700b246afaSJeff Mahoney fs_info->nodesize); 6713cae210fSQu Wenruo btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); 672f46b5a66SChristoph Hellwig 67349a3c4d9SDavid Sterba btrfs_set_root_flags(root_item, 0); 67449a3c4d9SDavid Sterba btrfs_set_root_limit(root_item, 0); 6753cae210fSQu Wenruo btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); 67608fe4db1SLi Zefan 67749a3c4d9SDavid Sterba btrfs_set_root_bytenr(root_item, leaf->start); 67849a3c4d9SDavid Sterba btrfs_set_root_generation(root_item, trans->transid); 67949a3c4d9SDavid Sterba btrfs_set_root_level(root_item, 0); 68049a3c4d9SDavid Sterba btrfs_set_root_refs(root_item, 1); 68149a3c4d9SDavid Sterba btrfs_set_root_used(root_item, leaf->len); 68249a3c4d9SDavid Sterba btrfs_set_root_last_snapshot(root_item, 0); 683f46b5a66SChristoph Hellwig 68449a3c4d9SDavid Sterba btrfs_set_root_generation_v2(root_item, 68549a3c4d9SDavid Sterba btrfs_root_generation(root_item)); 686807fc790SAndy Shevchenko generate_random_guid(root_item->uuid); 68749a3c4d9SDavid Sterba btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); 68849a3c4d9SDavid Sterba btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); 68949a3c4d9SDavid Sterba root_item->ctime = root_item->otime; 69049a3c4d9SDavid Sterba btrfs_set_root_ctransid(root_item, trans->transid); 69149a3c4d9SDavid Sterba btrfs_set_root_otransid(root_item, trans->transid); 692f46b5a66SChristoph Hellwig 693925baeddSChris Mason btrfs_tree_unlock(leaf); 694f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 695f46b5a66SChristoph Hellwig leaf = NULL; 696f46b5a66SChristoph Hellwig 69749a3c4d9SDavid Sterba btrfs_set_root_dirid(root_item, new_dirid); 698f46b5a66SChristoph Hellwig 699f46b5a66SChristoph Hellwig key.objectid = objectid; 7005d4f98a2SYan Zheng key.offset = 0; 701962a298fSDavid Sterba key.type = BTRFS_ROOT_ITEM_KEY; 7020b246afaSJeff Mahoney ret = btrfs_insert_root(trans, fs_info->tree_root, &key, 70349a3c4d9SDavid Sterba root_item); 704f46b5a66SChristoph Hellwig if (ret) 705f46b5a66SChristoph Hellwig goto fail; 706f46b5a66SChristoph Hellwig 70776dda93cSYan, Zheng key.offset = (u64)-1; 7082dfb1e43SQu Wenruo new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); 70979787eaaSJeff Mahoney if (IS_ERR(new_root)) { 7102dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 71179787eaaSJeff Mahoney ret = PTR_ERR(new_root); 71266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 71379787eaaSJeff Mahoney goto fail; 71479787eaaSJeff Mahoney } 7152dfb1e43SQu Wenruo /* Freeing will be done in btrfs_put_root() of new_root */ 7162dfb1e43SQu Wenruo anon_dev = 0; 71776dda93cSYan, Zheng 71876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 71976dda93cSYan, Zheng 72063541927SFilipe David Borba Manana ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); 72100246528SJosef Bacik btrfs_put_root(new_root); 722ce598979SMark Fasheh if (ret) { 723ce598979SMark Fasheh /* We potentially lose an unused inode item here */ 72466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 725ce598979SMark Fasheh goto fail; 726ce598979SMark Fasheh } 727ce598979SMark Fasheh 728f32e48e9SChandan Rajendra mutex_lock(&new_root->objectid_mutex); 729f32e48e9SChandan Rajendra new_root->highest_objectid = new_dirid; 730f32e48e9SChandan Rajendra mutex_unlock(&new_root->objectid_mutex); 731f32e48e9SChandan Rajendra 732f46b5a66SChristoph Hellwig /* 733f46b5a66SChristoph Hellwig * insert the directory item 734f46b5a66SChristoph Hellwig */ 735877574e2SNikolay Borisov ret = btrfs_set_inode_index(BTRFS_I(dir), &index); 73679787eaaSJeff Mahoney if (ret) { 73766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 73879787eaaSJeff Mahoney goto fail; 73979787eaaSJeff Mahoney } 7403de4586cSChris Mason 741684572dfSLu Fengqi ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, 7423de4586cSChris Mason BTRFS_FT_DIR, index); 74379787eaaSJeff Mahoney if (ret) { 74466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 745f46b5a66SChristoph Hellwig goto fail; 74679787eaaSJeff Mahoney } 7470660b5afSChris Mason 7486ef06d27SNikolay Borisov btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); 7499a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); 750c7e54b51SJosef Bacik if (ret) { 751c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 752c7e54b51SJosef Bacik goto fail; 753c7e54b51SJosef Bacik } 75452c26179SYan Zheng 7556025c19fSLu Fengqi ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, 7564a0cc7caSNikolay Borisov btrfs_ino(BTRFS_I(dir)), index, name, namelen); 757c7e54b51SJosef Bacik if (ret) { 758c7e54b51SJosef Bacik btrfs_abort_transaction(trans, ret); 759c7e54b51SJosef Bacik goto fail; 760c7e54b51SJosef Bacik } 7610660b5afSChris Mason 762cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, root_item->uuid, 7636bccf3abSJeff Mahoney BTRFS_UUID_KEY_SUBVOL, objectid); 764dd5f9615SStefan Behrens if (ret) 76566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 766dd5f9615SStefan Behrens 767f46b5a66SChristoph Hellwig fail: 76849a3c4d9SDavid Sterba kfree(root_item); 769d5c12070SMiao Xie trans->block_rsv = NULL; 770d5c12070SMiao Xie trans->bytes_reserved = 0; 771e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &block_rsv); 772de6e8200SLiu Bo 7733a45bb20SJeff Mahoney err = btrfs_commit_transaction(trans); 774f46b5a66SChristoph Hellwig if (err && !ret) 775f46b5a66SChristoph Hellwig ret = err; 7761a65e24bSChris Mason 7775662344bSTsutomu Itoh if (!ret) { 7785662344bSTsutomu Itoh inode = btrfs_lookup_dentry(dir, dentry); 779de6e8200SLiu Bo if (IS_ERR(inode)) 780de6e8200SLiu Bo return PTR_ERR(inode); 7815662344bSTsutomu Itoh d_instantiate(dentry, inode); 7825662344bSTsutomu Itoh } 783f46b5a66SChristoph Hellwig return ret; 78449a3c4d9SDavid Sterba 78549a3c4d9SDavid Sterba fail_free: 7862dfb1e43SQu Wenruo if (anon_dev) 7872dfb1e43SQu Wenruo free_anon_bdev(anon_dev); 78849a3c4d9SDavid Sterba kfree(root_item); 78949a3c4d9SDavid Sterba return ret; 790f46b5a66SChristoph Hellwig } 791f46b5a66SChristoph Hellwig 792e9662f70SMiao Xie static int create_snapshot(struct btrfs_root *root, struct inode *dir, 7939babda9fSNikolay Borisov struct dentry *dentry, bool readonly, 794e9662f70SMiao Xie struct btrfs_qgroup_inherit *inherit) 795f46b5a66SChristoph Hellwig { 7960b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 7972e4bfab9SYan, Zheng struct inode *inode; 798f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 799f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 8002e4bfab9SYan, Zheng int ret; 801f46b5a66SChristoph Hellwig 80292a7cc42SQu Wenruo if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) 803f46b5a66SChristoph Hellwig return -EINVAL; 804f46b5a66SChristoph Hellwig 805eede2bf3SOmar Sandoval if (atomic_read(&root->nr_swapfiles)) { 806eede2bf3SOmar Sandoval btrfs_warn(fs_info, 807eede2bf3SOmar Sandoval "cannot snapshot subvolume with active swapfile"); 808eede2bf3SOmar Sandoval return -ETXTBSY; 809eede2bf3SOmar Sandoval } 810eede2bf3SOmar Sandoval 81123269bf5SDavid Sterba pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); 812a1ee7362SDavid Sterba if (!pending_snapshot) 813a1ee7362SDavid Sterba return -ENOMEM; 814a1ee7362SDavid Sterba 8152dfb1e43SQu Wenruo ret = get_anon_bdev(&pending_snapshot->anon_dev); 8162dfb1e43SQu Wenruo if (ret < 0) 8172dfb1e43SQu Wenruo goto free_pending; 818b0c0ea63SDavid Sterba pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), 81923269bf5SDavid Sterba GFP_KERNEL); 8208546b570SDavid Sterba pending_snapshot->path = btrfs_alloc_path(); 8218546b570SDavid Sterba if (!pending_snapshot->root_item || !pending_snapshot->path) { 822b0c0ea63SDavid Sterba ret = -ENOMEM; 823b0c0ea63SDavid Sterba goto free_pending; 824b0c0ea63SDavid Sterba } 825b0c0ea63SDavid Sterba 82666d8f3ddSMiao Xie btrfs_init_block_rsv(&pending_snapshot->block_rsv, 82766d8f3ddSMiao Xie BTRFS_BLOCK_RSV_TEMP); 828d5c12070SMiao Xie /* 829d5c12070SMiao Xie * 1 - parent dir inode 830d5c12070SMiao Xie * 2 - dir entries 831d5c12070SMiao Xie * 1 - root item 832d5c12070SMiao Xie * 2 - root ref/backref 833d5c12070SMiao Xie * 1 - root of snapshot 834dd5f9615SStefan Behrens * 1 - UUID item 835d5c12070SMiao Xie */ 836d5c12070SMiao Xie ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, 837dd5f9615SStefan Behrens &pending_snapshot->block_rsv, 8, 838ee3441b4SJeff Mahoney false); 839d5c12070SMiao Xie if (ret) 840c11fbb6eSRobbie Ko goto free_pending; 841d5c12070SMiao Xie 842a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 843a22285a6SYan, Zheng pending_snapshot->root = root; 844b83cc969SLi Zefan pending_snapshot->readonly = readonly; 845e9662f70SMiao Xie pending_snapshot->dir = dir; 8468696c533SMiao Xie pending_snapshot->inherit = inherit; 847a22285a6SYan, Zheng 848d5c12070SMiao Xie trans = btrfs_start_transaction(root, 0); 849a22285a6SYan, Zheng if (IS_ERR(trans)) { 850a22285a6SYan, Zheng ret = PTR_ERR(trans); 851a22285a6SYan, Zheng goto fail; 852a22285a6SYan, Zheng } 853a22285a6SYan, Zheng 8540b246afaSJeff Mahoney spin_lock(&fs_info->trans_lock); 855a22285a6SYan, Zheng list_add(&pending_snapshot->list, 856a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 8570b246afaSJeff Mahoney spin_unlock(&fs_info->trans_lock); 8589babda9fSNikolay Borisov 8593a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 860aec8030aSMiao Xie if (ret) 861c37b2b62SJosef Bacik goto fail; 862a22285a6SYan, Zheng 863a22285a6SYan, Zheng ret = pending_snapshot->error; 864f46b5a66SChristoph Hellwig if (ret) 8652e4bfab9SYan, Zheng goto fail; 866f46b5a66SChristoph Hellwig 867d3797308SChris Mason ret = btrfs_orphan_cleanup(pending_snapshot->snap); 868d3797308SChris Mason if (ret) 869d3797308SChris Mason goto fail; 870d3797308SChris Mason 8712b0143b5SDavid Howells inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); 8722e4bfab9SYan, Zheng if (IS_ERR(inode)) { 8732e4bfab9SYan, Zheng ret = PTR_ERR(inode); 8742e4bfab9SYan, Zheng goto fail; 8752e4bfab9SYan, Zheng } 8765662344bSTsutomu Itoh 8772e4bfab9SYan, Zheng d_instantiate(dentry, inode); 8782e4bfab9SYan, Zheng ret = 0; 8792dfb1e43SQu Wenruo pending_snapshot->anon_dev = 0; 8802e4bfab9SYan, Zheng fail: 8812dfb1e43SQu Wenruo /* Prevent double freeing of anon_dev */ 8822dfb1e43SQu Wenruo if (ret && pending_snapshot->snap) 8832dfb1e43SQu Wenruo pending_snapshot->snap->anon_dev = 0; 88400246528SJosef Bacik btrfs_put_root(pending_snapshot->snap); 885e85fde51SQu Wenruo btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); 886b0c0ea63SDavid Sterba free_pending: 8872dfb1e43SQu Wenruo if (pending_snapshot->anon_dev) 8882dfb1e43SQu Wenruo free_anon_bdev(pending_snapshot->anon_dev); 889b0c0ea63SDavid Sterba kfree(pending_snapshot->root_item); 8908546b570SDavid Sterba btrfs_free_path(pending_snapshot->path); 891a1ee7362SDavid Sterba kfree(pending_snapshot); 892a1ee7362SDavid Sterba 893f46b5a66SChristoph Hellwig return ret; 894f46b5a66SChristoph Hellwig } 895f46b5a66SChristoph Hellwig 8964260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 8974260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 8984260f7c7SSage Weil * whether the type of victim is right. 8994260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 9004260f7c7SSage Weil * 2. We should have write and exec permissions on dir 9014260f7c7SSage Weil * 3. We can't remove anything from append-only dir 9024260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 9034260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 9044260f7c7SSage Weil * a. be owner of dir, or 9054260f7c7SSage Weil * b. be owner of victim, or 9064260f7c7SSage Weil * c. have CAP_FOWNER capability 90701327610SNicholas D Steeves * 6. If the victim is append-only or immutable we can't do anything with 9084260f7c7SSage Weil * links pointing to it. 9094260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 9104260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 9114260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 9124260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 9134260f7c7SSage Weil * nfs_async_unlink(). 9144260f7c7SSage Weil */ 9154260f7c7SSage Weil 9164260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) 9174260f7c7SSage Weil { 9184260f7c7SSage Weil int error; 9194260f7c7SSage Weil 9202b0143b5SDavid Howells if (d_really_is_negative(victim)) 9214260f7c7SSage Weil return -ENOENT; 9224260f7c7SSage Weil 9232b0143b5SDavid Howells BUG_ON(d_inode(victim->d_parent) != dir); 9244fa6b5ecSJeff Layton audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); 9254260f7c7SSage Weil 9264260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 9274260f7c7SSage Weil if (error) 9284260f7c7SSage Weil return error; 9294260f7c7SSage Weil if (IS_APPEND(dir)) 9304260f7c7SSage Weil return -EPERM; 9312b0143b5SDavid Howells if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || 9322b0143b5SDavid Howells IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) 9334260f7c7SSage Weil return -EPERM; 9344260f7c7SSage Weil if (isdir) { 935e36cb0b8SDavid Howells if (!d_is_dir(victim)) 9364260f7c7SSage Weil return -ENOTDIR; 9374260f7c7SSage Weil if (IS_ROOT(victim)) 9384260f7c7SSage Weil return -EBUSY; 939e36cb0b8SDavid Howells } else if (d_is_dir(victim)) 9404260f7c7SSage Weil return -EISDIR; 9414260f7c7SSage Weil if (IS_DEADDIR(dir)) 9424260f7c7SSage Weil return -ENOENT; 9434260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 9444260f7c7SSage Weil return -EBUSY; 9454260f7c7SSage Weil return 0; 9464260f7c7SSage Weil } 9474260f7c7SSage Weil 948cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 949cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 950cb8e7090SChristoph Hellwig { 9512b0143b5SDavid Howells if (d_really_is_positive(child)) 952cb8e7090SChristoph Hellwig return -EEXIST; 953cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 954cb8e7090SChristoph Hellwig return -ENOENT; 955cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 956cb8e7090SChristoph Hellwig } 957cb8e7090SChristoph Hellwig 958cb8e7090SChristoph Hellwig /* 959cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 960cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 961cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 962cb8e7090SChristoph Hellwig */ 96392872094SAl Viro static noinline int btrfs_mksubvol(const struct path *parent, 96452f75f4fSDavid Sterba const char *name, int namelen, 96572fd032eSSage Weil struct btrfs_root *snap_src, 9669babda9fSNikolay Borisov bool readonly, 9678696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 968cb8e7090SChristoph Hellwig { 9692b0143b5SDavid Howells struct inode *dir = d_inode(parent->dentry); 9700b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); 971cb8e7090SChristoph Hellwig struct dentry *dentry; 972cb8e7090SChristoph Hellwig int error; 973cb8e7090SChristoph Hellwig 97400235411SAl Viro error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 97500235411SAl Viro if (error == -EINTR) 97600235411SAl Viro return error; 977cb8e7090SChristoph Hellwig 978cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 979cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 980cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 981cb8e7090SChristoph Hellwig goto out_unlock; 982cb8e7090SChristoph Hellwig 98376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 984cb8e7090SChristoph Hellwig if (error) 985a874a63eSLiu Bo goto out_dput; 986cb8e7090SChristoph Hellwig 9879c52057cSChris Mason /* 9889c52057cSChris Mason * even if this name doesn't exist, we may get hash collisions. 9899c52057cSChris Mason * check for them now when we can safely fail 9909c52057cSChris Mason */ 9919c52057cSChris Mason error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, 9929c52057cSChris Mason dir->i_ino, name, 9939c52057cSChris Mason namelen); 9949c52057cSChris Mason if (error) 9959c52057cSChris Mason goto out_dput; 9969c52057cSChris Mason 9970b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 99876dda93cSYan, Zheng 99976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 100076dda93cSYan, Zheng goto out_up_read; 100176dda93cSYan, Zheng 10029babda9fSNikolay Borisov if (snap_src) 10039babda9fSNikolay Borisov error = create_snapshot(snap_src, dir, dentry, readonly, inherit); 10049babda9fSNikolay Borisov else 10059babda9fSNikolay Borisov error = create_subvol(dir, dentry, name, namelen, inherit); 10069babda9fSNikolay Borisov 100776dda93cSYan, Zheng if (!error) 100876dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 100976dda93cSYan, Zheng out_up_read: 10100b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 1011cb8e7090SChristoph Hellwig out_dput: 1012cb8e7090SChristoph Hellwig dput(dentry); 1013cb8e7090SChristoph Hellwig out_unlock: 10145955102cSAl Viro inode_unlock(dir); 1015cb8e7090SChristoph Hellwig return error; 1016cb8e7090SChristoph Hellwig } 1017cb8e7090SChristoph Hellwig 1018c11fbb6eSRobbie Ko static noinline int btrfs_mksnapshot(const struct path *parent, 1019c11fbb6eSRobbie Ko const char *name, int namelen, 1020c11fbb6eSRobbie Ko struct btrfs_root *root, 1021c11fbb6eSRobbie Ko bool readonly, 1022c11fbb6eSRobbie Ko struct btrfs_qgroup_inherit *inherit) 1023c11fbb6eSRobbie Ko { 1024c11fbb6eSRobbie Ko int ret; 1025c11fbb6eSRobbie Ko bool snapshot_force_cow = false; 1026c11fbb6eSRobbie Ko 1027c11fbb6eSRobbie Ko /* 1028c11fbb6eSRobbie Ko * Force new buffered writes to reserve space even when NOCOW is 1029c11fbb6eSRobbie Ko * possible. This is to avoid later writeback (running dealloc) to 1030c11fbb6eSRobbie Ko * fallback to COW mode and unexpectedly fail with ENOSPC. 1031c11fbb6eSRobbie Ko */ 1032c11fbb6eSRobbie Ko btrfs_drew_read_lock(&root->snapshot_lock); 1033c11fbb6eSRobbie Ko 1034c11fbb6eSRobbie Ko ret = btrfs_start_delalloc_snapshot(root); 1035c11fbb6eSRobbie Ko if (ret) 1036c11fbb6eSRobbie Ko goto out; 1037c11fbb6eSRobbie Ko 1038c11fbb6eSRobbie Ko /* 1039c11fbb6eSRobbie Ko * All previous writes have started writeback in NOCOW mode, so now 1040c11fbb6eSRobbie Ko * we force future writes to fallback to COW mode during snapshot 1041c11fbb6eSRobbie Ko * creation. 1042c11fbb6eSRobbie Ko */ 1043c11fbb6eSRobbie Ko atomic_inc(&root->snapshot_force_cow); 1044c11fbb6eSRobbie Ko snapshot_force_cow = true; 1045c11fbb6eSRobbie Ko 1046c11fbb6eSRobbie Ko btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); 1047c11fbb6eSRobbie Ko 1048c11fbb6eSRobbie Ko ret = btrfs_mksubvol(parent, name, namelen, 1049c11fbb6eSRobbie Ko root, readonly, inherit); 1050c11fbb6eSRobbie Ko out: 1051c11fbb6eSRobbie Ko if (snapshot_force_cow) 1052c11fbb6eSRobbie Ko atomic_dec(&root->snapshot_force_cow); 1053c11fbb6eSRobbie Ko btrfs_drew_read_unlock(&root->snapshot_lock); 1054c11fbb6eSRobbie Ko return ret; 1055c11fbb6eSRobbie Ko } 1056c11fbb6eSRobbie Ko 10574cb5300bSChris Mason /* 10584cb5300bSChris Mason * When we're defragging a range, we don't want to kick it off again 10594cb5300bSChris Mason * if it is really just waiting for delalloc to send it down. 10604cb5300bSChris Mason * If we find a nice big extent or delalloc range for the bytes in the 10614cb5300bSChris Mason * file you want to defrag, we return 0 to let you know to skip this 10624cb5300bSChris Mason * part of the file 10634cb5300bSChris Mason */ 1064aab110abSDavid Sterba static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) 10654cb5300bSChris Mason { 10664cb5300bSChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 10674cb5300bSChris Mason struct extent_map *em = NULL; 10684cb5300bSChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 10694cb5300bSChris Mason u64 end; 10704cb5300bSChris Mason 10714cb5300bSChris Mason read_lock(&em_tree->lock); 107209cbfeafSKirill A. Shutemov em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE); 10734cb5300bSChris Mason read_unlock(&em_tree->lock); 10744cb5300bSChris Mason 10754cb5300bSChris Mason if (em) { 10764cb5300bSChris Mason end = extent_map_end(em); 10774cb5300bSChris Mason free_extent_map(em); 10784cb5300bSChris Mason if (end - offset > thresh) 10794cb5300bSChris Mason return 0; 10804cb5300bSChris Mason } 10814cb5300bSChris Mason /* if we already have a nice delalloc here, just stop */ 10824cb5300bSChris Mason thresh /= 2; 10834cb5300bSChris Mason end = count_range_bits(io_tree, &offset, offset + thresh, 10844cb5300bSChris Mason thresh, EXTENT_DELALLOC, 1); 10854cb5300bSChris Mason if (end >= thresh) 10864cb5300bSChris Mason return 0; 10874cb5300bSChris Mason return 1; 10884cb5300bSChris Mason } 10894cb5300bSChris Mason 10904cb5300bSChris Mason /* 10914cb5300bSChris Mason * helper function to walk through a file and find extents 10924cb5300bSChris Mason * newer than a specific transid, and smaller than thresh. 10934cb5300bSChris Mason * 10944cb5300bSChris Mason * This is used by the defragging code to find new and small 10954cb5300bSChris Mason * extents 10964cb5300bSChris Mason */ 10974cb5300bSChris Mason static int find_new_extents(struct btrfs_root *root, 10984cb5300bSChris Mason struct inode *inode, u64 newer_than, 1099aab110abSDavid Sterba u64 *off, u32 thresh) 11004cb5300bSChris Mason { 11014cb5300bSChris Mason struct btrfs_path *path; 11024cb5300bSChris Mason struct btrfs_key min_key; 11034cb5300bSChris Mason struct extent_buffer *leaf; 11044cb5300bSChris Mason struct btrfs_file_extent_item *extent; 11054cb5300bSChris Mason int type; 11064cb5300bSChris Mason int ret; 11074a0cc7caSNikolay Borisov u64 ino = btrfs_ino(BTRFS_I(inode)); 11084cb5300bSChris Mason 11094cb5300bSChris Mason path = btrfs_alloc_path(); 11104cb5300bSChris Mason if (!path) 11114cb5300bSChris Mason return -ENOMEM; 11124cb5300bSChris Mason 1113a4689d2bSDavid Sterba min_key.objectid = ino; 11144cb5300bSChris Mason min_key.type = BTRFS_EXTENT_DATA_KEY; 11154cb5300bSChris Mason min_key.offset = *off; 11164cb5300bSChris Mason 11174cb5300bSChris Mason while (1) { 11186174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &min_key, path, newer_than); 11194cb5300bSChris Mason if (ret != 0) 11204cb5300bSChris Mason goto none; 1121f094c9bdSFilipe Manana process_slot: 1122a4689d2bSDavid Sterba if (min_key.objectid != ino) 11234cb5300bSChris Mason goto none; 11244cb5300bSChris Mason if (min_key.type != BTRFS_EXTENT_DATA_KEY) 11254cb5300bSChris Mason goto none; 11264cb5300bSChris Mason 11274cb5300bSChris Mason leaf = path->nodes[0]; 11284cb5300bSChris Mason extent = btrfs_item_ptr(leaf, path->slots[0], 11294cb5300bSChris Mason struct btrfs_file_extent_item); 11304cb5300bSChris Mason 11314cb5300bSChris Mason type = btrfs_file_extent_type(leaf, extent); 11324cb5300bSChris Mason if (type == BTRFS_FILE_EXTENT_REG && 11334cb5300bSChris Mason btrfs_file_extent_num_bytes(leaf, extent) < thresh && 11344cb5300bSChris Mason check_defrag_in_cache(inode, min_key.offset, thresh)) { 11354cb5300bSChris Mason *off = min_key.offset; 11364cb5300bSChris Mason btrfs_free_path(path); 11374cb5300bSChris Mason return 0; 11384cb5300bSChris Mason } 11394cb5300bSChris Mason 1140f094c9bdSFilipe Manana path->slots[0]++; 1141f094c9bdSFilipe Manana if (path->slots[0] < btrfs_header_nritems(leaf)) { 1142f094c9bdSFilipe Manana btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); 1143f094c9bdSFilipe Manana goto process_slot; 1144f094c9bdSFilipe Manana } 1145f094c9bdSFilipe Manana 11464cb5300bSChris Mason if (min_key.offset == (u64)-1) 11474cb5300bSChris Mason goto none; 11484cb5300bSChris Mason 11494cb5300bSChris Mason min_key.offset++; 11504cb5300bSChris Mason btrfs_release_path(path); 11514cb5300bSChris Mason } 11524cb5300bSChris Mason none: 11534cb5300bSChris Mason btrfs_free_path(path); 11544cb5300bSChris Mason return -ENOENT; 11554cb5300bSChris Mason } 11564cb5300bSChris Mason 11576c282eb4SLi Zefan static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) 115817ce6ef8SLiu Bo { 115917ce6ef8SLiu Bo struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 1160940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 11616c282eb4SLi Zefan struct extent_map *em; 116209cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 1163940100a4SChris Mason 1164940100a4SChris Mason /* 1165940100a4SChris Mason * hopefully we have this extent in the tree already, try without 1166940100a4SChris Mason * the full extent lock 1167940100a4SChris Mason */ 1168940100a4SChris Mason read_lock(&em_tree->lock); 1169940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 1170940100a4SChris Mason read_unlock(&em_tree->lock); 1171940100a4SChris Mason 1172940100a4SChris Mason if (!em) { 1173308d9800SFilipe Manana struct extent_state *cached = NULL; 1174308d9800SFilipe Manana u64 end = start + len - 1; 1175308d9800SFilipe Manana 1176940100a4SChris Mason /* get the big lock and read metadata off disk */ 1177ff13db41SDavid Sterba lock_extent_bits(io_tree, start, end, &cached); 117839b07b5dSOmar Sandoval em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len); 1179e43bbe5eSDavid Sterba unlock_extent_cached(io_tree, start, end, &cached); 1180940100a4SChris Mason 11816cf8bfbfSDan Carpenter if (IS_ERR(em)) 11826c282eb4SLi Zefan return NULL; 1183940100a4SChris Mason } 1184940100a4SChris Mason 11856c282eb4SLi Zefan return em; 11866c282eb4SLi Zefan } 11876c282eb4SLi Zefan 11886c282eb4SLi Zefan static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) 11896c282eb4SLi Zefan { 11906c282eb4SLi Zefan struct extent_map *next; 11916c282eb4SLi Zefan bool ret = true; 11926c282eb4SLi Zefan 11936c282eb4SLi Zefan /* this is the last extent */ 11946c282eb4SLi Zefan if (em->start + em->len >= i_size_read(inode)) 11956c282eb4SLi Zefan return false; 11966c282eb4SLi Zefan 11976c282eb4SLi Zefan next = defrag_lookup_extent(inode, em->start + em->len); 1198e9512d72SChris Mason if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) 1199e9512d72SChris Mason ret = false; 1200e9512d72SChris Mason else if ((em->block_start + em->block_len == next->block_start) && 1201ee22184bSByongho Lee (em->block_len > SZ_128K && next->block_len > SZ_128K)) 12026c282eb4SLi Zefan ret = false; 12036c282eb4SLi Zefan 12046c282eb4SLi Zefan free_extent_map(next); 12056c282eb4SLi Zefan return ret; 12066c282eb4SLi Zefan } 12076c282eb4SLi Zefan 1208aab110abSDavid Sterba static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, 1209a43a2111SAndrew Mahone u64 *last_len, u64 *skip, u64 *defrag_end, 1210a43a2111SAndrew Mahone int compress) 12116c282eb4SLi Zefan { 12126c282eb4SLi Zefan struct extent_map *em; 12136c282eb4SLi Zefan int ret = 1; 12146c282eb4SLi Zefan bool next_mergeable = true; 12154a3560c4SLiu Bo bool prev_mergeable = true; 12166c282eb4SLi Zefan 12176c282eb4SLi Zefan /* 12186c282eb4SLi Zefan * make sure that once we start defragging an extent, we keep on 12196c282eb4SLi Zefan * defragging it 12206c282eb4SLi Zefan */ 12216c282eb4SLi Zefan if (start < *defrag_end) 12226c282eb4SLi Zefan return 1; 12236c282eb4SLi Zefan 12246c282eb4SLi Zefan *skip = 0; 12256c282eb4SLi Zefan 12266c282eb4SLi Zefan em = defrag_lookup_extent(inode, start); 12276c282eb4SLi Zefan if (!em) 12286c282eb4SLi Zefan return 0; 12296c282eb4SLi Zefan 1230940100a4SChris Mason /* this will cover holes, and inline extents */ 123117ce6ef8SLiu Bo if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 1232940100a4SChris Mason ret = 0; 123317ce6ef8SLiu Bo goto out; 123417ce6ef8SLiu Bo } 123517ce6ef8SLiu Bo 12364a3560c4SLiu Bo if (!*defrag_end) 12374a3560c4SLiu Bo prev_mergeable = false; 12384a3560c4SLiu Bo 12396c282eb4SLi Zefan next_mergeable = defrag_check_next_extent(inode, em); 1240940100a4SChris Mason /* 12416c282eb4SLi Zefan * we hit a real extent, if it is big or the next extent is not a 12426c282eb4SLi Zefan * real extent, don't bother defragging it 1243940100a4SChris Mason */ 1244a43a2111SAndrew Mahone if (!compress && (*last_len == 0 || *last_len >= thresh) && 12454a3560c4SLiu Bo (em->len >= thresh || (!next_mergeable && !prev_mergeable))) 1246940100a4SChris Mason ret = 0; 124717ce6ef8SLiu Bo out: 1248940100a4SChris Mason /* 1249940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 1250940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 1251940100a4SChris Mason * so that the next tiny extent will force a defrag. 1252940100a4SChris Mason * 1253940100a4SChris Mason * The end result of this is that tiny extents before a single big 1254940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 1255940100a4SChris Mason */ 1256940100a4SChris Mason if (ret) { 1257940100a4SChris Mason *defrag_end = extent_map_end(em); 1258940100a4SChris Mason } else { 1259940100a4SChris Mason *last_len = 0; 1260940100a4SChris Mason *skip = extent_map_end(em); 1261940100a4SChris Mason *defrag_end = 0; 1262940100a4SChris Mason } 1263940100a4SChris Mason 1264940100a4SChris Mason free_extent_map(em); 1265940100a4SChris Mason return ret; 1266940100a4SChris Mason } 1267940100a4SChris Mason 12684cb5300bSChris Mason /* 12694cb5300bSChris Mason * it doesn't do much good to defrag one or two pages 12704cb5300bSChris Mason * at a time. This pulls in a nice chunk of pages 12714cb5300bSChris Mason * to COW and defrag. 12724cb5300bSChris Mason * 12734cb5300bSChris Mason * It also makes sure the delalloc code has enough 12744cb5300bSChris Mason * dirty data to avoid making new small extents as part 12754cb5300bSChris Mason * of the defrag 12764cb5300bSChris Mason * 12774cb5300bSChris Mason * It's a good idea to start RA on this range 12784cb5300bSChris Mason * before calling this. 12794cb5300bSChris Mason */ 12804cb5300bSChris Mason static int cluster_pages_for_defrag(struct inode *inode, 12814cb5300bSChris Mason struct page **pages, 12824cb5300bSChris Mason unsigned long start_index, 1283c41570c9SJustin Maggard unsigned long num_pages) 1284f46b5a66SChristoph Hellwig { 12854cb5300bSChris Mason unsigned long file_end; 12864cb5300bSChris Mason u64 isize = i_size_read(inode); 1287f46b5a66SChristoph Hellwig u64 page_start; 1288f46b5a66SChristoph Hellwig u64 page_end; 12891f12bd06SLiu Bo u64 page_cnt; 1290a1fbc675SMatthew Wilcox (Oracle) u64 start = (u64)start_index << PAGE_SHIFT; 12917f458a38SFilipe Manana u64 search_start; 12924cb5300bSChris Mason int ret; 12934cb5300bSChris Mason int i; 12944cb5300bSChris Mason int i_done; 12954cb5300bSChris Mason struct btrfs_ordered_extent *ordered; 12964cb5300bSChris Mason struct extent_state *cached_state = NULL; 1297600a45e1SMiao Xie struct extent_io_tree *tree; 1298364ecf36SQu Wenruo struct extent_changeset *data_reserved = NULL; 12993b16a4e3SJosef Bacik gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); 13004cb5300bSChris Mason 130109cbfeafSKirill A. Shutemov file_end = (isize - 1) >> PAGE_SHIFT; 13021f12bd06SLiu Bo if (!isize || start_index > file_end) 13031f12bd06SLiu Bo return 0; 13041f12bd06SLiu Bo 13051f12bd06SLiu Bo page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); 13064cb5300bSChris Mason 1307e5b7231eSNikolay Borisov ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 1308a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT); 13094cb5300bSChris Mason if (ret) 13104cb5300bSChris Mason return ret; 13114cb5300bSChris Mason i_done = 0; 1312600a45e1SMiao Xie tree = &BTRFS_I(inode)->io_tree; 13134cb5300bSChris Mason 13144cb5300bSChris Mason /* step one, lock all the pages */ 13151f12bd06SLiu Bo for (i = 0; i < page_cnt; i++) { 13164cb5300bSChris Mason struct page *page; 1317600a45e1SMiao Xie again: 1318a94733d0SJosef Bacik page = find_or_create_page(inode->i_mapping, 13193b16a4e3SJosef Bacik start_index + i, mask); 13204cb5300bSChris Mason if (!page) 13214cb5300bSChris Mason break; 13224cb5300bSChris Mason 1323600a45e1SMiao Xie page_start = page_offset(page); 132409cbfeafSKirill A. Shutemov page_end = page_start + PAGE_SIZE - 1; 1325600a45e1SMiao Xie while (1) { 1326308d9800SFilipe Manana lock_extent_bits(tree, page_start, page_end, 1327ff13db41SDavid Sterba &cached_state); 1328c3504372SNikolay Borisov ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), 1329600a45e1SMiao Xie page_start); 1330308d9800SFilipe Manana unlock_extent_cached(tree, page_start, page_end, 1331e43bbe5eSDavid Sterba &cached_state); 1332600a45e1SMiao Xie if (!ordered) 1333600a45e1SMiao Xie break; 1334600a45e1SMiao Xie 1335600a45e1SMiao Xie unlock_page(page); 1336c0a43603SNikolay Borisov btrfs_start_ordered_extent(ordered, 1); 1337600a45e1SMiao Xie btrfs_put_ordered_extent(ordered); 1338600a45e1SMiao Xie lock_page(page); 13391f12bd06SLiu Bo /* 13401f12bd06SLiu Bo * we unlocked the page above, so we need check if 13411f12bd06SLiu Bo * it was released or not. 13421f12bd06SLiu Bo */ 13431f12bd06SLiu Bo if (page->mapping != inode->i_mapping) { 13441f12bd06SLiu Bo unlock_page(page); 134509cbfeafSKirill A. Shutemov put_page(page); 13461f12bd06SLiu Bo goto again; 13471f12bd06SLiu Bo } 1348600a45e1SMiao Xie } 1349600a45e1SMiao Xie 13504cb5300bSChris Mason if (!PageUptodate(page)) { 13514cb5300bSChris Mason btrfs_readpage(NULL, page); 13524cb5300bSChris Mason lock_page(page); 13534cb5300bSChris Mason if (!PageUptodate(page)) { 13544cb5300bSChris Mason unlock_page(page); 135509cbfeafSKirill A. Shutemov put_page(page); 13564cb5300bSChris Mason ret = -EIO; 13574cb5300bSChris Mason break; 13584cb5300bSChris Mason } 13594cb5300bSChris Mason } 1360600a45e1SMiao Xie 1361600a45e1SMiao Xie if (page->mapping != inode->i_mapping) { 1362600a45e1SMiao Xie unlock_page(page); 136309cbfeafSKirill A. Shutemov put_page(page); 1364600a45e1SMiao Xie goto again; 1365600a45e1SMiao Xie } 1366600a45e1SMiao Xie 13674cb5300bSChris Mason pages[i] = page; 13684cb5300bSChris Mason i_done++; 13694cb5300bSChris Mason } 13704cb5300bSChris Mason if (!i_done || ret) 13714cb5300bSChris Mason goto out; 13724cb5300bSChris Mason 13731751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 13744cb5300bSChris Mason goto out; 13754cb5300bSChris Mason 13764cb5300bSChris Mason /* 13774cb5300bSChris Mason * so now we have a nice long stream of locked 13784cb5300bSChris Mason * and up to date pages, lets wait on them 13794cb5300bSChris Mason */ 13804cb5300bSChris Mason for (i = 0; i < i_done; i++) 13814cb5300bSChris Mason wait_on_page_writeback(pages[i]); 13824cb5300bSChris Mason 13834cb5300bSChris Mason page_start = page_offset(pages[0]); 138409cbfeafSKirill A. Shutemov page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE; 13854cb5300bSChris Mason 13864cb5300bSChris Mason lock_extent_bits(&BTRFS_I(inode)->io_tree, 1387ff13db41SDavid Sterba page_start, page_end - 1, &cached_state); 13887f458a38SFilipe Manana 13897f458a38SFilipe Manana /* 13907f458a38SFilipe Manana * When defragmenting we skip ranges that have holes or inline extents, 13917f458a38SFilipe Manana * (check should_defrag_range()), to avoid unnecessary IO and wasting 13927f458a38SFilipe Manana * space. At btrfs_defrag_file(), we check if a range should be defragged 13937f458a38SFilipe Manana * before locking the inode and then, if it should, we trigger a sync 13947f458a38SFilipe Manana * page cache readahead - we lock the inode only after that to avoid 13957f458a38SFilipe Manana * blocking for too long other tasks that possibly want to operate on 13967f458a38SFilipe Manana * other file ranges. But before we were able to get the inode lock, 13977f458a38SFilipe Manana * some other task may have punched a hole in the range, or we may have 13987f458a38SFilipe Manana * now an inline extent, in which case we should not defrag. So check 13997f458a38SFilipe Manana * for that here, where we have the inode and the range locked, and bail 14007f458a38SFilipe Manana * out if that happened. 14017f458a38SFilipe Manana */ 14027f458a38SFilipe Manana search_start = page_start; 14037f458a38SFilipe Manana while (search_start < page_end) { 14047f458a38SFilipe Manana struct extent_map *em; 14057f458a38SFilipe Manana 14067f458a38SFilipe Manana em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start, 14077f458a38SFilipe Manana page_end - search_start); 14087f458a38SFilipe Manana if (IS_ERR(em)) { 14097f458a38SFilipe Manana ret = PTR_ERR(em); 14107f458a38SFilipe Manana goto out_unlock_range; 14117f458a38SFilipe Manana } 14127f458a38SFilipe Manana if (em->block_start >= EXTENT_MAP_LAST_BYTE) { 14137f458a38SFilipe Manana free_extent_map(em); 14147f458a38SFilipe Manana /* Ok, 0 means we did not defrag anything */ 14157f458a38SFilipe Manana ret = 0; 14167f458a38SFilipe Manana goto out_unlock_range; 14177f458a38SFilipe Manana } 14187f458a38SFilipe Manana search_start = extent_map_end(em); 14197f458a38SFilipe Manana free_extent_map(em); 14207f458a38SFilipe Manana } 14217f458a38SFilipe Manana 14224cb5300bSChris Mason clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, 1423e182163dSOmar Sandoval page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | 1424e182163dSOmar Sandoval EXTENT_DEFRAG, 0, 0, &cached_state); 14254cb5300bSChris Mason 14261f12bd06SLiu Bo if (i_done != page_cnt) { 14279e0baf60SJosef Bacik spin_lock(&BTRFS_I(inode)->lock); 142828c4a3e2SSu Yue btrfs_mod_outstanding_extents(BTRFS_I(inode), 1); 14299e0baf60SJosef Bacik spin_unlock(&BTRFS_I(inode)->lock); 143086d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1431a1fbc675SMatthew Wilcox (Oracle) start, (page_cnt - i_done) << PAGE_SHIFT, true); 14324cb5300bSChris Mason } 14334cb5300bSChris Mason 14344cb5300bSChris Mason 14359e8a4a8bSLiu Bo set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, 1436018ed4f7SDavid Sterba &cached_state); 14374cb5300bSChris Mason 14384cb5300bSChris Mason unlock_extent_cached(&BTRFS_I(inode)->io_tree, 1439e43bbe5eSDavid Sterba page_start, page_end - 1, &cached_state); 14404cb5300bSChris Mason 14414cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14424cb5300bSChris Mason clear_page_dirty_for_io(pages[i]); 14434cb5300bSChris Mason ClearPageChecked(pages[i]); 14444cb5300bSChris Mason set_page_extent_mapped(pages[i]); 14454cb5300bSChris Mason set_page_dirty(pages[i]); 14464cb5300bSChris Mason unlock_page(pages[i]); 144709cbfeafSKirill A. Shutemov put_page(pages[i]); 14484cb5300bSChris Mason } 14498702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1450364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14514cb5300bSChris Mason return i_done; 14527f458a38SFilipe Manana 14537f458a38SFilipe Manana out_unlock_range: 14547f458a38SFilipe Manana unlock_extent_cached(&BTRFS_I(inode)->io_tree, 14557f458a38SFilipe Manana page_start, page_end - 1, &cached_state); 14564cb5300bSChris Mason out: 14574cb5300bSChris Mason for (i = 0; i < i_done; i++) { 14584cb5300bSChris Mason unlock_page(pages[i]); 145909cbfeafSKirill A. Shutemov put_page(pages[i]); 14604cb5300bSChris Mason } 146186d52921SNikolay Borisov btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved, 1462a1fbc675SMatthew Wilcox (Oracle) start, page_cnt << PAGE_SHIFT, true); 14638702ba93SQu Wenruo btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT); 1464364ecf36SQu Wenruo extent_changeset_free(data_reserved); 14654cb5300bSChris Mason return ret; 14664cb5300bSChris Mason 14674cb5300bSChris Mason } 14684cb5300bSChris Mason 14694cb5300bSChris Mason int btrfs_defrag_file(struct inode *inode, struct file *file, 14704cb5300bSChris Mason struct btrfs_ioctl_defrag_range_args *range, 14714cb5300bSChris Mason u64 newer_than, unsigned long max_to_defrag) 14724cb5300bSChris Mason { 14730b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 14744cb5300bSChris Mason struct btrfs_root *root = BTRFS_I(inode)->root; 14754cb5300bSChris Mason struct file_ra_state *ra = NULL; 14764cb5300bSChris Mason unsigned long last_index; 1477151a31b2SLi Zefan u64 isize = i_size_read(inode); 1478940100a4SChris Mason u64 last_len = 0; 1479940100a4SChris Mason u64 skip = 0; 1480940100a4SChris Mason u64 defrag_end = 0; 14814cb5300bSChris Mason u64 newer_off = range->start; 1482f46b5a66SChristoph Hellwig unsigned long i; 1483008873eaSLi Zefan unsigned long ra_index = 0; 1484f46b5a66SChristoph Hellwig int ret; 14854cb5300bSChris Mason int defrag_count = 0; 14861a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 1487aab110abSDavid Sterba u32 extent_thresh = range->extent_thresh; 148809cbfeafSKirill A. Shutemov unsigned long max_cluster = SZ_256K >> PAGE_SHIFT; 1489c41570c9SJustin Maggard unsigned long cluster = max_cluster; 1490ee22184bSByongho Lee u64 new_align = ~((u64)SZ_128K - 1); 14914cb5300bSChris Mason struct page **pages = NULL; 14921e2ef46dSDavid Sterba bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; 14934cb5300bSChris Mason 14940abd5b17SLiu Bo if (isize == 0) 14950abd5b17SLiu Bo return 0; 14960abd5b17SLiu Bo 14970abd5b17SLiu Bo if (range->start >= isize) 14980abd5b17SLiu Bo return -EINVAL; 14991a419d85SLi Zefan 15001e2ef46dSDavid Sterba if (do_compress) { 1501ce96b7ffSChengguang Xu if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) 15021a419d85SLi Zefan return -EINVAL; 15031a419d85SLi Zefan if (range->compress_type) 15041a419d85SLi Zefan compress_type = range->compress_type; 15051a419d85SLi Zefan } 1506f46b5a66SChristoph Hellwig 15070abd5b17SLiu Bo if (extent_thresh == 0) 1508ee22184bSByongho Lee extent_thresh = SZ_256K; 1509f46b5a66SChristoph Hellwig 15104cb5300bSChris Mason /* 15110a52d108SDavid Sterba * If we were not given a file, allocate a readahead context. As 15120a52d108SDavid Sterba * readahead is just an optimization, defrag will work without it so 15130a52d108SDavid Sterba * we don't error out. 15144cb5300bSChris Mason */ 15154cb5300bSChris Mason if (!file) { 151663e727ecSDavid Sterba ra = kzalloc(sizeof(*ra), GFP_KERNEL); 15170a52d108SDavid Sterba if (ra) 15184cb5300bSChris Mason file_ra_state_init(ra, inode->i_mapping); 15194cb5300bSChris Mason } else { 15204cb5300bSChris Mason ra = &file->f_ra; 15214cb5300bSChris Mason } 15224cb5300bSChris Mason 152363e727ecSDavid Sterba pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL); 15244cb5300bSChris Mason if (!pages) { 15254cb5300bSChris Mason ret = -ENOMEM; 15264cb5300bSChris Mason goto out_ra; 15274cb5300bSChris Mason } 15284cb5300bSChris Mason 15294cb5300bSChris Mason /* find the last page to defrag */ 15301e701a32SChris Mason if (range->start + range->len > range->start) { 1531151a31b2SLi Zefan last_index = min_t(u64, isize - 1, 153209cbfeafSKirill A. Shutemov range->start + range->len - 1) >> PAGE_SHIFT; 15331e701a32SChris Mason } else { 153409cbfeafSKirill A. Shutemov last_index = (isize - 1) >> PAGE_SHIFT; 15351e701a32SChris Mason } 15361e701a32SChris Mason 15374cb5300bSChris Mason if (newer_than) { 15384cb5300bSChris Mason ret = find_new_extents(root, inode, newer_than, 1539ee22184bSByongho Lee &newer_off, SZ_64K); 15404cb5300bSChris Mason if (!ret) { 15414cb5300bSChris Mason range->start = newer_off; 15424cb5300bSChris Mason /* 15434cb5300bSChris Mason * we always align our defrag to help keep 15444cb5300bSChris Mason * the extents in the file evenly spaced 15454cb5300bSChris Mason */ 154609cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 15474cb5300bSChris Mason } else 15484cb5300bSChris Mason goto out_ra; 15494cb5300bSChris Mason } else { 155009cbfeafSKirill A. Shutemov i = range->start >> PAGE_SHIFT; 15514cb5300bSChris Mason } 15524cb5300bSChris Mason if (!max_to_defrag) 1553070034bdSchandan max_to_defrag = last_index - i + 1; 15544cb5300bSChris Mason 15552a0f7f57SLi Zefan /* 15562a0f7f57SLi Zefan * make writeback starts from i, so the defrag range can be 15572a0f7f57SLi Zefan * written sequentially. 15582a0f7f57SLi Zefan */ 15592a0f7f57SLi Zefan if (i < inode->i_mapping->writeback_index) 15602a0f7f57SLi Zefan inode->i_mapping->writeback_index = i; 15612a0f7f57SLi Zefan 1562f7f43cc8SChris Mason while (i <= last_index && defrag_count < max_to_defrag && 156309cbfeafSKirill A. Shutemov (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) { 15644cb5300bSChris Mason /* 15654cb5300bSChris Mason * make sure we stop running if someone unmounts 15664cb5300bSChris Mason * the FS 15674cb5300bSChris Mason */ 15681751e8a6SLinus Torvalds if (!(inode->i_sb->s_flags & SB_ACTIVE)) 15694cb5300bSChris Mason break; 15704cb5300bSChris Mason 15710b246afaSJeff Mahoney if (btrfs_defrag_cancelled(fs_info)) { 15720b246afaSJeff Mahoney btrfs_debug(fs_info, "defrag_file cancelled"); 1573210549ebSDavid Sterba ret = -EAGAIN; 1574210549ebSDavid Sterba break; 1575210549ebSDavid Sterba } 1576210549ebSDavid Sterba 157709cbfeafSKirill A. Shutemov if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT, 15786c282eb4SLi Zefan extent_thresh, &last_len, &skip, 15791e2ef46dSDavid Sterba &defrag_end, do_compress)){ 1580940100a4SChris Mason unsigned long next; 1581940100a4SChris Mason /* 1582940100a4SChris Mason * the should_defrag function tells us how much to skip 1583940100a4SChris Mason * bump our counter by the suggested amount 1584940100a4SChris Mason */ 158509cbfeafSKirill A. Shutemov next = DIV_ROUND_UP(skip, PAGE_SIZE); 1586940100a4SChris Mason i = max(i + 1, next); 1587940100a4SChris Mason continue; 1588940100a4SChris Mason } 1589008873eaSLi Zefan 1590008873eaSLi Zefan if (!newer_than) { 159109cbfeafSKirill A. Shutemov cluster = (PAGE_ALIGN(defrag_end) >> 159209cbfeafSKirill A. Shutemov PAGE_SHIFT) - i; 1593008873eaSLi Zefan cluster = min(cluster, max_cluster); 1594008873eaSLi Zefan } else { 1595008873eaSLi Zefan cluster = max_cluster; 1596008873eaSLi Zefan } 1597008873eaSLi Zefan 1598008873eaSLi Zefan if (i + cluster > ra_index) { 1599008873eaSLi Zefan ra_index = max(i, ra_index); 16000a52d108SDavid Sterba if (ra) 1601d3c0bab5SDavid Sterba page_cache_sync_readahead(inode->i_mapping, ra, 1602d3c0bab5SDavid Sterba file, ra_index, cluster); 1603e4826a5bSchandan ra_index += cluster; 1604008873eaSLi Zefan } 16054cb5300bSChris Mason 16065955102cSAl Viro inode_lock(inode); 1607eede2bf3SOmar Sandoval if (IS_SWAPFILE(inode)) { 1608eede2bf3SOmar Sandoval ret = -ETXTBSY; 1609eede2bf3SOmar Sandoval } else { 16101e2ef46dSDavid Sterba if (do_compress) 1611eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = compress_type; 1612008873eaSLi Zefan ret = cluster_pages_for_defrag(inode, pages, i, cluster); 1613eede2bf3SOmar Sandoval } 1614ecb8bea8SLiu Bo if (ret < 0) { 16155955102cSAl Viro inode_unlock(inode); 16164cb5300bSChris Mason goto out_ra; 1617ecb8bea8SLiu Bo } 16184cb5300bSChris Mason 16194cb5300bSChris Mason defrag_count += ret; 1620d0e1d66bSNamjae Jeon balance_dirty_pages_ratelimited(inode->i_mapping); 16215955102cSAl Viro inode_unlock(inode); 16224cb5300bSChris Mason 16234cb5300bSChris Mason if (newer_than) { 16244cb5300bSChris Mason if (newer_off == (u64)-1) 16254cb5300bSChris Mason break; 16264cb5300bSChris Mason 1627e1f041e1SLiu Bo if (ret > 0) 1628e1f041e1SLiu Bo i += ret; 1629e1f041e1SLiu Bo 16304cb5300bSChris Mason newer_off = max(newer_off + 1, 163109cbfeafSKirill A. Shutemov (u64)i << PAGE_SHIFT); 16324cb5300bSChris Mason 1633ee22184bSByongho Lee ret = find_new_extents(root, inode, newer_than, 1634ee22184bSByongho Lee &newer_off, SZ_64K); 16354cb5300bSChris Mason if (!ret) { 16364cb5300bSChris Mason range->start = newer_off; 163709cbfeafSKirill A. Shutemov i = (newer_off & new_align) >> PAGE_SHIFT; 16384cb5300bSChris Mason } else { 16394cb5300bSChris Mason break; 1640940100a4SChris Mason } 16414cb5300bSChris Mason } else { 1642008873eaSLi Zefan if (ret > 0) { 1643cbcc8326SLi Zefan i += ret; 164409cbfeafSKirill A. Shutemov last_len += ret << PAGE_SHIFT; 1645008873eaSLi Zefan } else { 1646940100a4SChris Mason i++; 1647008873eaSLi Zefan last_len = 0; 1648008873eaSLi Zefan } 1649f46b5a66SChristoph Hellwig } 16504cb5300bSChris Mason } 1651f46b5a66SChristoph Hellwig 1652dec8ef90SFilipe Manana if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { 16531e701a32SChris Mason filemap_flush(inode->i_mapping); 1654dec8ef90SFilipe Manana if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, 1655dec8ef90SFilipe Manana &BTRFS_I(inode)->runtime_flags)) 1656dec8ef90SFilipe Manana filemap_flush(inode->i_mapping); 1657dec8ef90SFilipe Manana } 16581e701a32SChris Mason 16591a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 16600b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); 16615c1aab1dSNick Terrell } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) { 16625c1aab1dSNick Terrell btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); 16631a419d85SLi Zefan } 16641a419d85SLi Zefan 166560ccf82fSDiego Calleja ret = defrag_count; 1666940100a4SChris Mason 16674cb5300bSChris Mason out_ra: 16681e2ef46dSDavid Sterba if (do_compress) { 16695955102cSAl Viro inode_lock(inode); 1670eec63c65SDavid Sterba BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; 16715955102cSAl Viro inode_unlock(inode); 1672633085c7SFilipe David Borba Manana } 16734cb5300bSChris Mason if (!file) 16744cb5300bSChris Mason kfree(ra); 16754cb5300bSChris Mason kfree(pages); 1676940100a4SChris Mason return ret; 1677f46b5a66SChristoph Hellwig } 1678f46b5a66SChristoph Hellwig 1679198605a8SMiao Xie static noinline int btrfs_ioctl_resize(struct file *file, 168076dda93cSYan, Zheng void __user *arg) 1681f46b5a66SChristoph Hellwig { 16820b246afaSJeff Mahoney struct inode *inode = file_inode(file); 16830b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 1684f46b5a66SChristoph Hellwig u64 new_size; 1685f46b5a66SChristoph Hellwig u64 old_size; 1686f46b5a66SChristoph Hellwig u64 devid = 1; 16870b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 1688f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1689f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1690f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 1691f46b5a66SChristoph Hellwig char *sizestr; 16929a40f122SGui Hecheng char *retptr; 1693f46b5a66SChristoph Hellwig char *devstr = NULL; 1694f46b5a66SChristoph Hellwig int ret = 0; 1695f46b5a66SChristoph Hellwig int mod = 0; 1696f46b5a66SChristoph Hellwig 1697e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1698e441d54dSChris Mason return -EPERM; 1699e441d54dSChris Mason 1700198605a8SMiao Xie ret = mnt_want_write_file(file); 1701198605a8SMiao Xie if (ret) 1702198605a8SMiao Xie return ret; 1703198605a8SMiao Xie 1704c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_RESIZE)) { 170597547676SMiao Xie mnt_drop_write_file(file); 1706e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 1707c9e9f97bSIlya Dryomov } 1708c9e9f97bSIlya Dryomov 1709dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1710c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 1711c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 1712c9e9f97bSIlya Dryomov goto out; 1713c9e9f97bSIlya Dryomov } 17145516e595SMark Fasheh 17155516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1716f46b5a66SChristoph Hellwig 1717f46b5a66SChristoph Hellwig sizestr = vol_args->name; 1718f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 1719f46b5a66SChristoph Hellwig if (devstr) { 1720f46b5a66SChristoph Hellwig sizestr = devstr + 1; 1721f46b5a66SChristoph Hellwig *devstr = '\0'; 1722f46b5a66SChristoph Hellwig devstr = vol_args->name; 172358dfae63SZhangZhen ret = kstrtoull(devstr, 10, &devid); 172458dfae63SZhangZhen if (ret) 172558dfae63SZhangZhen goto out_free; 1726dfd79829SMiao Xie if (!devid) { 1727dfd79829SMiao Xie ret = -EINVAL; 1728dfd79829SMiao Xie goto out_free; 1729dfd79829SMiao Xie } 17300b246afaSJeff Mahoney btrfs_info(fs_info, "resizing devid %llu", devid); 1731f46b5a66SChristoph Hellwig } 1732dba60f3fSMiao Xie 1733b2598edfSAnand Jain device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL); 1734f46b5a66SChristoph Hellwig if (!device) { 17350b246afaSJeff Mahoney btrfs_info(fs_info, "resizer unable to find device %llu", 1736c1c9ff7cSGeert Uytterhoeven devid); 1737dfd79829SMiao Xie ret = -ENODEV; 1738c9e9f97bSIlya Dryomov goto out_free; 1739f46b5a66SChristoph Hellwig } 1740dba60f3fSMiao Xie 1741ebbede42SAnand Jain if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { 17420b246afaSJeff Mahoney btrfs_info(fs_info, 1743efe120a0SFrank Holton "resizer unable to apply on readonly device %llu", 1744c1c9ff7cSGeert Uytterhoeven devid); 1745dfd79829SMiao Xie ret = -EPERM; 17464e42ae1bSLiu Bo goto out_free; 17474e42ae1bSLiu Bo } 17484e42ae1bSLiu Bo 1749f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 1750f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 1751f46b5a66SChristoph Hellwig else { 1752f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 1753f46b5a66SChristoph Hellwig mod = -1; 1754f46b5a66SChristoph Hellwig sizestr++; 1755f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 1756f46b5a66SChristoph Hellwig mod = 1; 1757f46b5a66SChristoph Hellwig sizestr++; 1758f46b5a66SChristoph Hellwig } 17599a40f122SGui Hecheng new_size = memparse(sizestr, &retptr); 17609a40f122SGui Hecheng if (*retptr != '\0' || new_size == 0) { 1761f46b5a66SChristoph Hellwig ret = -EINVAL; 1762c9e9f97bSIlya Dryomov goto out_free; 1763f46b5a66SChristoph Hellwig } 1764f46b5a66SChristoph Hellwig } 1765f46b5a66SChristoph Hellwig 1766401e29c1SAnand Jain if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { 1767dfd79829SMiao Xie ret = -EPERM; 176863a212abSStefan Behrens goto out_free; 176963a212abSStefan Behrens } 177063a212abSStefan Behrens 17717cc8e58dSMiao Xie old_size = btrfs_device_get_total_bytes(device); 1772f46b5a66SChristoph Hellwig 1773f46b5a66SChristoph Hellwig if (mod < 0) { 1774f46b5a66SChristoph Hellwig if (new_size > old_size) { 1775f46b5a66SChristoph Hellwig ret = -EINVAL; 1776c9e9f97bSIlya Dryomov goto out_free; 1777f46b5a66SChristoph Hellwig } 1778f46b5a66SChristoph Hellwig new_size = old_size - new_size; 1779f46b5a66SChristoph Hellwig } else if (mod > 0) { 1780eb8052e0SWenliang Fan if (new_size > ULLONG_MAX - old_size) { 1781902c68a4SGui Hecheng ret = -ERANGE; 1782eb8052e0SWenliang Fan goto out_free; 1783eb8052e0SWenliang Fan } 1784f46b5a66SChristoph Hellwig new_size = old_size + new_size; 1785f46b5a66SChristoph Hellwig } 1786f46b5a66SChristoph Hellwig 1787ee22184bSByongho Lee if (new_size < SZ_256M) { 1788f46b5a66SChristoph Hellwig ret = -EINVAL; 1789c9e9f97bSIlya Dryomov goto out_free; 1790f46b5a66SChristoph Hellwig } 1791f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 1792f46b5a66SChristoph Hellwig ret = -EFBIG; 1793c9e9f97bSIlya Dryomov goto out_free; 1794f46b5a66SChristoph Hellwig } 1795f46b5a66SChristoph Hellwig 179647f08b96SNikolay Borisov new_size = round_down(new_size, fs_info->sectorsize); 1797f46b5a66SChristoph Hellwig 1798f46b5a66SChristoph Hellwig if (new_size > old_size) { 1799a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 180098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 180198d5dc13STsutomu Itoh ret = PTR_ERR(trans); 1802c9e9f97bSIlya Dryomov goto out_free; 180398d5dc13STsutomu Itoh } 1804f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 18053a45bb20SJeff Mahoney btrfs_commit_transaction(trans); 1806ece7d20eSMike Fleetwood } else if (new_size < old_size) { 1807f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 18080253f40eSjeff.liu } /* equal, nothing need to do */ 1809f46b5a66SChristoph Hellwig 1810faf8f7b9SMarcos Paulo de Souza if (ret == 0 && new_size != old_size) 1811faf8f7b9SMarcos Paulo de Souza btrfs_info_in_rcu(fs_info, 1812faf8f7b9SMarcos Paulo de Souza "resize device %s (devid %llu) from %llu to %llu", 1813faf8f7b9SMarcos Paulo de Souza rcu_str_deref(device->name), device->devid, 1814faf8f7b9SMarcos Paulo de Souza old_size, new_size); 1815c9e9f97bSIlya Dryomov out_free: 1816f46b5a66SChristoph Hellwig kfree(vol_args); 1817c9e9f97bSIlya Dryomov out: 1818c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 181918f39c41SIlya Dryomov mnt_drop_write_file(file); 1820f46b5a66SChristoph Hellwig return ret; 1821f46b5a66SChristoph Hellwig } 1822f46b5a66SChristoph Hellwig 18235d54c67eSNikolay Borisov static noinline int __btrfs_ioctl_snap_create(struct file *file, 182452f75f4fSDavid Sterba const char *name, unsigned long fd, int subvol, 18255d54c67eSNikolay Borisov bool readonly, 18268696c533SMiao Xie struct btrfs_qgroup_inherit *inherit) 1827f46b5a66SChristoph Hellwig { 1828f46b5a66SChristoph Hellwig int namelen; 18293de4586cSChris Mason int ret = 0; 1830f46b5a66SChristoph Hellwig 1831325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1832325c50e3SJeff Mahoney return -ENOTDIR; 1833325c50e3SJeff Mahoney 1834a874a63eSLiu Bo ret = mnt_want_write_file(file); 1835a874a63eSLiu Bo if (ret) 1836a874a63eSLiu Bo goto out; 1837a874a63eSLiu Bo 183872fd032eSSage Weil namelen = strlen(name); 183972fd032eSSage Weil if (strchr(name, '/')) { 1840f46b5a66SChristoph Hellwig ret = -EINVAL; 1841a874a63eSLiu Bo goto out_drop_write; 1842f46b5a66SChristoph Hellwig } 1843f46b5a66SChristoph Hellwig 184416780cabSChris Mason if (name[0] == '.' && 184516780cabSChris Mason (namelen == 1 || (name[1] == '.' && namelen == 2))) { 184616780cabSChris Mason ret = -EEXIST; 1847a874a63eSLiu Bo goto out_drop_write; 184816780cabSChris Mason } 184916780cabSChris Mason 18503de4586cSChris Mason if (subvol) { 185172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 18525d54c67eSNikolay Borisov NULL, readonly, inherit); 1853cb8e7090SChristoph Hellwig } else { 18542903ff01SAl Viro struct fd src = fdget(fd); 18553de4586cSChris Mason struct inode *src_inode; 18562903ff01SAl Viro if (!src.file) { 18573de4586cSChris Mason ret = -EINVAL; 1858a874a63eSLiu Bo goto out_drop_write; 18593de4586cSChris Mason } 18603de4586cSChris Mason 1861496ad9aaSAl Viro src_inode = file_inode(src.file); 1862496ad9aaSAl Viro if (src_inode->i_sb != file_inode(file)->i_sb) { 1863c79b4713SJosef Bacik btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, 1864efe120a0SFrank Holton "Snapshot src from another FS"); 186523ad5b17SKusanagi Kouichi ret = -EXDEV; 1866d0242061SDavid Sterba } else if (!inode_owner_or_capable(src_inode)) { 1867d0242061SDavid Sterba /* 1868d0242061SDavid Sterba * Subvolume creation is not restricted, but snapshots 1869d0242061SDavid Sterba * are limited to own subvolumes only 1870d0242061SDavid Sterba */ 1871d0242061SDavid Sterba ret = -EPERM; 1872ecd18815SAl Viro } else { 1873c11fbb6eSRobbie Ko ret = btrfs_mksnapshot(&file->f_path, name, namelen, 187472fd032eSSage Weil BTRFS_I(src_inode)->root, 18755d54c67eSNikolay Borisov readonly, inherit); 1876ecd18815SAl Viro } 18772903ff01SAl Viro fdput(src); 1878cb8e7090SChristoph Hellwig } 1879a874a63eSLiu Bo out_drop_write: 1880a874a63eSLiu Bo mnt_drop_write_file(file); 1881f46b5a66SChristoph Hellwig out: 188272fd032eSSage Weil return ret; 188372fd032eSSage Weil } 188472fd032eSSage Weil 188572fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1886fa0d2b9bSLi Zefan void __user *arg, int subvol) 188772fd032eSSage Weil { 1888fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 188972fd032eSSage Weil int ret; 189072fd032eSSage Weil 1891325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1892325c50e3SJeff Mahoney return -ENOTDIR; 1893325c50e3SJeff Mahoney 1894fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1895fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1896fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1897fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1898fa0d2b9bSLi Zefan 18995d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19005d54c67eSNikolay Borisov subvol, false, NULL); 1901fa0d2b9bSLi Zefan 1902fa0d2b9bSLi Zefan kfree(vol_args); 1903fa0d2b9bSLi Zefan return ret; 1904fa0d2b9bSLi Zefan } 1905fa0d2b9bSLi Zefan 1906fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1907fa0d2b9bSLi Zefan void __user *arg, int subvol) 1908fa0d2b9bSLi Zefan { 1909fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1910fa0d2b9bSLi Zefan int ret; 1911b83cc969SLi Zefan bool readonly = false; 19126f72c7e2SArne Jansen struct btrfs_qgroup_inherit *inherit = NULL; 191372fd032eSSage Weil 1914325c50e3SJeff Mahoney if (!S_ISDIR(file_inode(file)->i_mode)) 1915325c50e3SJeff Mahoney return -ENOTDIR; 1916325c50e3SJeff Mahoney 1917fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1918fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1919fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1920fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1921fdfb1e4fSLi Zefan 1922673990dbSDavid Sterba if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { 1923b83cc969SLi Zefan ret = -EOPNOTSUPP; 1924c47ca32dSDan Carpenter goto free_args; 1925fdfb1e4fSLi Zefan } 1926fdfb1e4fSLi Zefan 1927b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1928b83cc969SLi Zefan readonly = true; 19296f72c7e2SArne Jansen if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { 193009cbfeafSKirill A. Shutemov if (vol_args->size > PAGE_SIZE) { 19316f72c7e2SArne Jansen ret = -EINVAL; 1932c47ca32dSDan Carpenter goto free_args; 19336f72c7e2SArne Jansen } 19346f72c7e2SArne Jansen inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); 19356f72c7e2SArne Jansen if (IS_ERR(inherit)) { 19366f72c7e2SArne Jansen ret = PTR_ERR(inherit); 1937c47ca32dSDan Carpenter goto free_args; 19386f72c7e2SArne Jansen } 19396f72c7e2SArne Jansen } 194075eaa0e2SSage Weil 19415d54c67eSNikolay Borisov ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd, 19425d54c67eSNikolay Borisov subvol, readonly, inherit); 1943c47ca32dSDan Carpenter if (ret) 1944c47ca32dSDan Carpenter goto free_inherit; 1945c47ca32dSDan Carpenter free_inherit: 19466f72c7e2SArne Jansen kfree(inherit); 1947c47ca32dSDan Carpenter free_args: 1948c47ca32dSDan Carpenter kfree(vol_args); 1949f46b5a66SChristoph Hellwig return ret; 1950f46b5a66SChristoph Hellwig } 1951f46b5a66SChristoph Hellwig 19520caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 19530caa102dSLi Zefan void __user *arg) 19540caa102dSLi Zefan { 1955496ad9aaSAl Viro struct inode *inode = file_inode(file); 19560b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19570caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19580caa102dSLi Zefan int ret = 0; 19590caa102dSLi Zefan u64 flags = 0; 19600caa102dSLi Zefan 19614a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) 19620caa102dSLi Zefan return -EINVAL; 19630caa102dSLi Zefan 19640b246afaSJeff Mahoney down_read(&fs_info->subvol_sem); 19650caa102dSLi Zefan if (btrfs_root_readonly(root)) 19660caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 19670b246afaSJeff Mahoney up_read(&fs_info->subvol_sem); 19680caa102dSLi Zefan 19690caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 19700caa102dSLi Zefan ret = -EFAULT; 19710caa102dSLi Zefan 19720caa102dSLi Zefan return ret; 19730caa102dSLi Zefan } 19740caa102dSLi Zefan 19750caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 19760caa102dSLi Zefan void __user *arg) 19770caa102dSLi Zefan { 1978496ad9aaSAl Viro struct inode *inode = file_inode(file); 19790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 19800caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 19810caa102dSLi Zefan struct btrfs_trans_handle *trans; 19820caa102dSLi Zefan u64 root_flags; 19830caa102dSLi Zefan u64 flags; 19840caa102dSLi Zefan int ret = 0; 19850caa102dSLi Zefan 1986bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 1987bd60ea0fSDavid Sterba return -EPERM; 1988bd60ea0fSDavid Sterba 1989b9ca0664SLiu Bo ret = mnt_want_write_file(file); 1990b9ca0664SLiu Bo if (ret) 1991b9ca0664SLiu Bo goto out; 19920caa102dSLi Zefan 19934a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 1994b9ca0664SLiu Bo ret = -EINVAL; 1995b9ca0664SLiu Bo goto out_drop_write; 1996b9ca0664SLiu Bo } 19970caa102dSLi Zefan 1998b9ca0664SLiu Bo if (copy_from_user(&flags, arg, sizeof(flags))) { 1999b9ca0664SLiu Bo ret = -EFAULT; 2000b9ca0664SLiu Bo goto out_drop_write; 2001b9ca0664SLiu Bo } 20020caa102dSLi Zefan 2003b9ca0664SLiu Bo if (flags & ~BTRFS_SUBVOL_RDONLY) { 2004b9ca0664SLiu Bo ret = -EOPNOTSUPP; 2005b9ca0664SLiu Bo goto out_drop_write; 2006b9ca0664SLiu Bo } 20070caa102dSLi Zefan 20080b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 20090caa102dSLi Zefan 20100caa102dSLi Zefan /* nothing to do */ 20110caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 2012b9ca0664SLiu Bo goto out_drop_sem; 20130caa102dSLi Zefan 20140caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 20152c686537SDavid Sterba if (flags & BTRFS_SUBVOL_RDONLY) { 20160caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20170caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 20182c686537SDavid Sterba } else { 20192c686537SDavid Sterba /* 20202c686537SDavid Sterba * Block RO -> RW transition if this subvolume is involved in 20212c686537SDavid Sterba * send 20222c686537SDavid Sterba */ 20232c686537SDavid Sterba spin_lock(&root->root_item_lock); 20242c686537SDavid Sterba if (root->send_in_progress == 0) { 20250caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 20260caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 20272c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20282c686537SDavid Sterba } else { 20292c686537SDavid Sterba spin_unlock(&root->root_item_lock); 20300b246afaSJeff Mahoney btrfs_warn(fs_info, 20312c686537SDavid Sterba "Attempt to set subvolume %llu read-write during send", 20322c686537SDavid Sterba root->root_key.objectid); 20332c686537SDavid Sterba ret = -EPERM; 20342c686537SDavid Sterba goto out_drop_sem; 20352c686537SDavid Sterba } 20362c686537SDavid Sterba } 20370caa102dSLi Zefan 20380caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 20390caa102dSLi Zefan if (IS_ERR(trans)) { 20400caa102dSLi Zefan ret = PTR_ERR(trans); 20410caa102dSLi Zefan goto out_reset; 20420caa102dSLi Zefan } 20430caa102dSLi Zefan 20440b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 20450caa102dSLi Zefan &root->root_key, &root->root_item); 20469417ebc8SNikolay Borisov if (ret < 0) { 20479417ebc8SNikolay Borisov btrfs_end_transaction(trans); 20489417ebc8SNikolay Borisov goto out_reset; 20499417ebc8SNikolay Borisov } 20500caa102dSLi Zefan 20519417ebc8SNikolay Borisov ret = btrfs_commit_transaction(trans); 20529417ebc8SNikolay Borisov 20530caa102dSLi Zefan out_reset: 20540caa102dSLi Zefan if (ret) 20550caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 2056b9ca0664SLiu Bo out_drop_sem: 20570b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 2058b9ca0664SLiu Bo out_drop_write: 2059b9ca0664SLiu Bo mnt_drop_write_file(file); 2060b9ca0664SLiu Bo out: 20610caa102dSLi Zefan return ret; 20620caa102dSLi Zefan } 20630caa102dSLi Zefan 2064ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 2065ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 2066ac8e9819SChris Mason { 2067abc6e134SChris Mason struct btrfs_key test; 2068abc6e134SChris Mason int ret; 2069abc6e134SChris Mason 2070abc6e134SChris Mason test.objectid = sk->min_objectid; 2071abc6e134SChris Mason test.type = sk->min_type; 2072abc6e134SChris Mason test.offset = sk->min_offset; 2073abc6e134SChris Mason 2074abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2075abc6e134SChris Mason if (ret < 0) 2076ac8e9819SChris Mason return 0; 2077abc6e134SChris Mason 2078abc6e134SChris Mason test.objectid = sk->max_objectid; 2079abc6e134SChris Mason test.type = sk->max_type; 2080abc6e134SChris Mason test.offset = sk->max_offset; 2081abc6e134SChris Mason 2082abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 2083abc6e134SChris Mason if (ret > 0) 2084ac8e9819SChris Mason return 0; 2085ac8e9819SChris Mason return 1; 2086ac8e9819SChris Mason } 2087ac8e9819SChris Mason 2088df397565SJeff Mahoney static noinline int copy_to_sk(struct btrfs_path *path, 2089ac8e9819SChris Mason struct btrfs_key *key, 2090ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 20919b6e817dSGerhard Heift size_t *buf_size, 2092ba346b35SGerhard Heift char __user *ubuf, 2093ac8e9819SChris Mason unsigned long *sk_offset, 2094ac8e9819SChris Mason int *num_found) 2095ac8e9819SChris Mason { 2096ac8e9819SChris Mason u64 found_transid; 2097ac8e9819SChris Mason struct extent_buffer *leaf; 2098ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 2099dd81d459SNaohiro Aota struct btrfs_key test; 2100ac8e9819SChris Mason unsigned long item_off; 2101ac8e9819SChris Mason unsigned long item_len; 2102ac8e9819SChris Mason int nritems; 2103ac8e9819SChris Mason int i; 2104ac8e9819SChris Mason int slot; 2105ac8e9819SChris Mason int ret = 0; 2106ac8e9819SChris Mason 2107ac8e9819SChris Mason leaf = path->nodes[0]; 2108ac8e9819SChris Mason slot = path->slots[0]; 2109ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 2110ac8e9819SChris Mason 2111ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 2112ac8e9819SChris Mason i = nritems; 2113ac8e9819SChris Mason goto advance_key; 2114ac8e9819SChris Mason } 2115ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 2116ac8e9819SChris Mason 2117ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 2118ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 2119ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 2120ac8e9819SChris Mason 212103b71c6cSGabriel de Perthuis btrfs_item_key_to_cpu(leaf, key, i); 212203b71c6cSGabriel de Perthuis if (!key_in_sk(key, sk)) 212303b71c6cSGabriel de Perthuis continue; 212403b71c6cSGabriel de Perthuis 21259b6e817dSGerhard Heift if (sizeof(sh) + item_len > *buf_size) { 21268f5f6178SGerhard Heift if (*num_found) { 2127ac8e9819SChris Mason ret = 1; 21288f5f6178SGerhard Heift goto out; 21298f5f6178SGerhard Heift } 21308f5f6178SGerhard Heift 21318f5f6178SGerhard Heift /* 21328f5f6178SGerhard Heift * return one empty item back for v1, which does not 21338f5f6178SGerhard Heift * handle -EOVERFLOW 21348f5f6178SGerhard Heift */ 21358f5f6178SGerhard Heift 21369b6e817dSGerhard Heift *buf_size = sizeof(sh) + item_len; 2137ac8e9819SChris Mason item_len = 0; 21388f5f6178SGerhard Heift ret = -EOVERFLOW; 21398f5f6178SGerhard Heift } 2140ac8e9819SChris Mason 21419b6e817dSGerhard Heift if (sizeof(sh) + item_len + *sk_offset > *buf_size) { 2142ac8e9819SChris Mason ret = 1; 214325c9bc2eSGerhard Heift goto out; 2144ac8e9819SChris Mason } 2145ac8e9819SChris Mason 2146ac8e9819SChris Mason sh.objectid = key->objectid; 2147ac8e9819SChris Mason sh.offset = key->offset; 2148ac8e9819SChris Mason sh.type = key->type; 2149ac8e9819SChris Mason sh.len = item_len; 2150ac8e9819SChris Mason sh.transid = found_transid; 2151ac8e9819SChris Mason 2152a48b73ecSJosef Bacik /* 2153a48b73ecSJosef Bacik * Copy search result header. If we fault then loop again so we 2154a48b73ecSJosef Bacik * can fault in the pages and -EFAULT there if there's a 2155a48b73ecSJosef Bacik * problem. Otherwise we'll fault and then copy the buffer in 2156a48b73ecSJosef Bacik * properly this next time through 2157a48b73ecSJosef Bacik */ 2158a48b73ecSJosef Bacik if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { 2159a48b73ecSJosef Bacik ret = 0; 2160ba346b35SGerhard Heift goto out; 2161ba346b35SGerhard Heift } 2162ba346b35SGerhard Heift 2163ac8e9819SChris Mason *sk_offset += sizeof(sh); 2164ac8e9819SChris Mason 2165ac8e9819SChris Mason if (item_len) { 2166ba346b35SGerhard Heift char __user *up = ubuf + *sk_offset; 2167a48b73ecSJosef Bacik /* 2168a48b73ecSJosef Bacik * Copy the item, same behavior as above, but reset the 2169a48b73ecSJosef Bacik * * sk_offset so we copy the full thing again. 2170a48b73ecSJosef Bacik */ 2171a48b73ecSJosef Bacik if (read_extent_buffer_to_user_nofault(leaf, up, 2172ba346b35SGerhard Heift item_off, item_len)) { 2173a48b73ecSJosef Bacik ret = 0; 2174a48b73ecSJosef Bacik *sk_offset -= sizeof(sh); 2175ba346b35SGerhard Heift goto out; 2176ba346b35SGerhard Heift } 2177ba346b35SGerhard Heift 2178ac8e9819SChris Mason *sk_offset += item_len; 2179ac8e9819SChris Mason } 2180e2156867SHugo Mills (*num_found)++; 2181ac8e9819SChris Mason 21828f5f6178SGerhard Heift if (ret) /* -EOVERFLOW from above */ 21838f5f6178SGerhard Heift goto out; 21848f5f6178SGerhard Heift 218525c9bc2eSGerhard Heift if (*num_found >= sk->nr_items) { 218625c9bc2eSGerhard Heift ret = 1; 218725c9bc2eSGerhard Heift goto out; 218825c9bc2eSGerhard Heift } 2189ac8e9819SChris Mason } 2190ac8e9819SChris Mason advance_key: 2191ac8e9819SChris Mason ret = 0; 2192dd81d459SNaohiro Aota test.objectid = sk->max_objectid; 2193dd81d459SNaohiro Aota test.type = sk->max_type; 2194dd81d459SNaohiro Aota test.offset = sk->max_offset; 2195dd81d459SNaohiro Aota if (btrfs_comp_cpu_keys(key, &test) >= 0) 2196dd81d459SNaohiro Aota ret = 1; 2197dd81d459SNaohiro Aota else if (key->offset < (u64)-1) 2198abc6e134SChris Mason key->offset++; 2199dd81d459SNaohiro Aota else if (key->type < (u8)-1) { 2200abc6e134SChris Mason key->offset = 0; 2201abc6e134SChris Mason key->type++; 2202dd81d459SNaohiro Aota } else if (key->objectid < (u64)-1) { 2203abc6e134SChris Mason key->offset = 0; 2204abc6e134SChris Mason key->type = 0; 2205abc6e134SChris Mason key->objectid++; 2206abc6e134SChris Mason } else 2207abc6e134SChris Mason ret = 1; 220825c9bc2eSGerhard Heift out: 2209ba346b35SGerhard Heift /* 2210ba346b35SGerhard Heift * 0: all items from this leaf copied, continue with next 2211ba346b35SGerhard Heift * 1: * more items can be copied, but unused buffer is too small 2212ba346b35SGerhard Heift * * all items were found 2213ba346b35SGerhard Heift * Either way, it will stops the loop which iterates to the next 2214ba346b35SGerhard Heift * leaf 2215ba346b35SGerhard Heift * -EOVERFLOW: item was to large for buffer 2216ba346b35SGerhard Heift * -EFAULT: could not copy extent buffer back to userspace 2217ba346b35SGerhard Heift */ 2218ac8e9819SChris Mason return ret; 2219ac8e9819SChris Mason } 2220ac8e9819SChris Mason 2221ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 222212544442SGerhard Heift struct btrfs_ioctl_search_key *sk, 22239b6e817dSGerhard Heift size_t *buf_size, 2224ba346b35SGerhard Heift char __user *ubuf) 2225ac8e9819SChris Mason { 22260b246afaSJeff Mahoney struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); 2227ac8e9819SChris Mason struct btrfs_root *root; 2228ac8e9819SChris Mason struct btrfs_key key; 2229ac8e9819SChris Mason struct btrfs_path *path; 2230ac8e9819SChris Mason int ret; 2231ac8e9819SChris Mason int num_found = 0; 2232ac8e9819SChris Mason unsigned long sk_offset = 0; 2233ac8e9819SChris Mason 22349b6e817dSGerhard Heift if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { 22359b6e817dSGerhard Heift *buf_size = sizeof(struct btrfs_ioctl_search_header); 223612544442SGerhard Heift return -EOVERFLOW; 22379b6e817dSGerhard Heift } 223812544442SGerhard Heift 2239ac8e9819SChris Mason path = btrfs_alloc_path(); 2240ac8e9819SChris Mason if (!path) 2241ac8e9819SChris Mason return -ENOMEM; 2242ac8e9819SChris Mason 2243ac8e9819SChris Mason if (sk->tree_id == 0) { 2244ac8e9819SChris Mason /* search the root of the inode that was passed */ 224500246528SJosef Bacik root = btrfs_grab_root(BTRFS_I(inode)->root); 2246ac8e9819SChris Mason } else { 224756e9357aSDavid Sterba root = btrfs_get_fs_root(info, sk->tree_id, true); 2248ac8e9819SChris Mason if (IS_ERR(root)) { 2249ac8e9819SChris Mason btrfs_free_path(path); 2250ad1e3d56SMisono Tomohiro return PTR_ERR(root); 2251ac8e9819SChris Mason } 2252ac8e9819SChris Mason } 2253ac8e9819SChris Mason 2254ac8e9819SChris Mason key.objectid = sk->min_objectid; 2255ac8e9819SChris Mason key.type = sk->min_type; 2256ac8e9819SChris Mason key.offset = sk->min_offset; 2257ac8e9819SChris Mason 2258ac8e9819SChris Mason while (1) { 22591c78544eSFilipe Manana ret = fault_in_pages_writeable(ubuf + sk_offset, 22601c78544eSFilipe Manana *buf_size - sk_offset); 2261a48b73ecSJosef Bacik if (ret) 2262a48b73ecSJosef Bacik break; 2263a48b73ecSJosef Bacik 22646174d3cbSFilipe David Borba Manana ret = btrfs_search_forward(root, &key, path, sk->min_transid); 2265ac8e9819SChris Mason if (ret != 0) { 2266ac8e9819SChris Mason if (ret > 0) 2267ac8e9819SChris Mason ret = 0; 2268ac8e9819SChris Mason goto err; 2269ac8e9819SChris Mason } 2270df397565SJeff Mahoney ret = copy_to_sk(path, &key, sk, buf_size, ubuf, 2271ac8e9819SChris Mason &sk_offset, &num_found); 2272b3b4aa74SDavid Sterba btrfs_release_path(path); 227325c9bc2eSGerhard Heift if (ret) 2274ac8e9819SChris Mason break; 2275ac8e9819SChris Mason 2276ac8e9819SChris Mason } 22778f5f6178SGerhard Heift if (ret > 0) 2278ac8e9819SChris Mason ret = 0; 2279ac8e9819SChris Mason err: 2280ac8e9819SChris Mason sk->nr_items = num_found; 228100246528SJosef Bacik btrfs_put_root(root); 2282ac8e9819SChris Mason btrfs_free_path(path); 2283ac8e9819SChris Mason return ret; 2284ac8e9819SChris Mason } 2285ac8e9819SChris Mason 2286ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 2287ac8e9819SChris Mason void __user *argp) 2288ac8e9819SChris Mason { 2289ba346b35SGerhard Heift struct btrfs_ioctl_search_args __user *uargs; 2290ba346b35SGerhard Heift struct btrfs_ioctl_search_key sk; 2291ac8e9819SChris Mason struct inode *inode; 2292ac8e9819SChris Mason int ret; 22939b6e817dSGerhard Heift size_t buf_size; 2294ac8e9819SChris Mason 2295ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 2296ac8e9819SChris Mason return -EPERM; 2297ac8e9819SChris Mason 2298ba346b35SGerhard Heift uargs = (struct btrfs_ioctl_search_args __user *)argp; 2299ac8e9819SChris Mason 2300ba346b35SGerhard Heift if (copy_from_user(&sk, &uargs->key, sizeof(sk))) 2301ba346b35SGerhard Heift return -EFAULT; 2302ba346b35SGerhard Heift 2303ba346b35SGerhard Heift buf_size = sizeof(uargs->buf); 2304ac8e9819SChris Mason 2305496ad9aaSAl Viro inode = file_inode(file); 2306ba346b35SGerhard Heift ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); 23078f5f6178SGerhard Heift 23088f5f6178SGerhard Heift /* 23098f5f6178SGerhard Heift * In the origin implementation an overflow is handled by returning a 23108f5f6178SGerhard Heift * search header with a len of zero, so reset ret. 23118f5f6178SGerhard Heift */ 23128f5f6178SGerhard Heift if (ret == -EOVERFLOW) 23138f5f6178SGerhard Heift ret = 0; 23148f5f6178SGerhard Heift 2315ba346b35SGerhard Heift if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) 2316ac8e9819SChris Mason ret = -EFAULT; 2317ac8e9819SChris Mason return ret; 2318ac8e9819SChris Mason } 2319ac8e9819SChris Mason 2320cc68a8a5SGerhard Heift static noinline int btrfs_ioctl_tree_search_v2(struct file *file, 2321cc68a8a5SGerhard Heift void __user *argp) 2322cc68a8a5SGerhard Heift { 2323cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 __user *uarg; 2324cc68a8a5SGerhard Heift struct btrfs_ioctl_search_args_v2 args; 2325cc68a8a5SGerhard Heift struct inode *inode; 2326cc68a8a5SGerhard Heift int ret; 2327cc68a8a5SGerhard Heift size_t buf_size; 2328ee22184bSByongho Lee const size_t buf_limit = SZ_16M; 2329cc68a8a5SGerhard Heift 2330cc68a8a5SGerhard Heift if (!capable(CAP_SYS_ADMIN)) 2331cc68a8a5SGerhard Heift return -EPERM; 2332cc68a8a5SGerhard Heift 2333cc68a8a5SGerhard Heift /* copy search header and buffer size */ 2334cc68a8a5SGerhard Heift uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; 2335cc68a8a5SGerhard Heift if (copy_from_user(&args, uarg, sizeof(args))) 2336cc68a8a5SGerhard Heift return -EFAULT; 2337cc68a8a5SGerhard Heift 2338cc68a8a5SGerhard Heift buf_size = args.buf_size; 2339cc68a8a5SGerhard Heift 2340cc68a8a5SGerhard Heift /* limit result size to 16MB */ 2341cc68a8a5SGerhard Heift if (buf_size > buf_limit) 2342cc68a8a5SGerhard Heift buf_size = buf_limit; 2343cc68a8a5SGerhard Heift 2344cc68a8a5SGerhard Heift inode = file_inode(file); 2345cc68a8a5SGerhard Heift ret = search_ioctl(inode, &args.key, &buf_size, 2346718dc5faSOmar Sandoval (char __user *)(&uarg->buf[0])); 2347cc68a8a5SGerhard Heift if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) 2348cc68a8a5SGerhard Heift ret = -EFAULT; 2349cc68a8a5SGerhard Heift else if (ret == -EOVERFLOW && 2350cc68a8a5SGerhard Heift copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) 2351cc68a8a5SGerhard Heift ret = -EFAULT; 2352cc68a8a5SGerhard Heift 235376dda93cSYan, Zheng return ret; 235476dda93cSYan, Zheng } 235576dda93cSYan, Zheng 235698d377a0STARUISI Hiroaki /* 2357ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 2358ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 235998d377a0STARUISI Hiroaki */ 236098d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 236198d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 236298d377a0STARUISI Hiroaki { 236398d377a0STARUISI Hiroaki struct btrfs_root *root; 236498d377a0STARUISI Hiroaki struct btrfs_key key; 2365ac8e9819SChris Mason char *ptr; 236698d377a0STARUISI Hiroaki int ret = -1; 236798d377a0STARUISI Hiroaki int slot; 236898d377a0STARUISI Hiroaki int len; 236998d377a0STARUISI Hiroaki int total_len = 0; 237098d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 237198d377a0STARUISI Hiroaki struct extent_buffer *l; 237298d377a0STARUISI Hiroaki struct btrfs_path *path; 237398d377a0STARUISI Hiroaki 237498d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 237598d377a0STARUISI Hiroaki name[0]='\0'; 237698d377a0STARUISI Hiroaki return 0; 237798d377a0STARUISI Hiroaki } 237898d377a0STARUISI Hiroaki 237998d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 238098d377a0STARUISI Hiroaki if (!path) 238198d377a0STARUISI Hiroaki return -ENOMEM; 238298d377a0STARUISI Hiroaki 2383c8bcbfbdSNikolay Borisov ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; 238498d377a0STARUISI Hiroaki 238556e9357aSDavid Sterba root = btrfs_get_fs_root(info, tree_id, true); 238698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 2387ad1e3d56SMisono Tomohiro ret = PTR_ERR(root); 238888234012SJosef Bacik root = NULL; 238988234012SJosef Bacik goto out; 239088234012SJosef Bacik } 239198d377a0STARUISI Hiroaki 239298d377a0STARUISI Hiroaki key.objectid = dirid; 239398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 23948ad6fcabSChris Mason key.offset = (u64)-1; 239598d377a0STARUISI Hiroaki 239698d377a0STARUISI Hiroaki while (1) { 239798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 239898d377a0STARUISI Hiroaki if (ret < 0) 239998d377a0STARUISI Hiroaki goto out; 240018674c6cSFilipe David Borba Manana else if (ret > 0) { 240118674c6cSFilipe David Borba Manana ret = btrfs_previous_item(root, path, dirid, 240218674c6cSFilipe David Borba Manana BTRFS_INODE_REF_KEY); 240318674c6cSFilipe David Borba Manana if (ret < 0) 240418674c6cSFilipe David Borba Manana goto out; 240518674c6cSFilipe David Borba Manana else if (ret > 0) { 2406ac8e9819SChris Mason ret = -ENOENT; 240798d377a0STARUISI Hiroaki goto out; 2408ac8e9819SChris Mason } 240918674c6cSFilipe David Borba Manana } 241018674c6cSFilipe David Borba Manana 241118674c6cSFilipe David Borba Manana l = path->nodes[0]; 241218674c6cSFilipe David Borba Manana slot = path->slots[0]; 241318674c6cSFilipe David Borba Manana btrfs_item_key_to_cpu(l, &key, slot); 241498d377a0STARUISI Hiroaki 241598d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 241698d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 241798d377a0STARUISI Hiroaki ptr -= len + 1; 241898d377a0STARUISI Hiroaki total_len += len + 1; 2419a696cf35SFilipe David Borba Manana if (ptr < name) { 2420a696cf35SFilipe David Borba Manana ret = -ENAMETOOLONG; 242198d377a0STARUISI Hiroaki goto out; 2422a696cf35SFilipe David Borba Manana } 242398d377a0STARUISI Hiroaki 242498d377a0STARUISI Hiroaki *(ptr + len) = '/'; 242598d377a0STARUISI Hiroaki read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); 242698d377a0STARUISI Hiroaki 242798d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 242898d377a0STARUISI Hiroaki break; 242998d377a0STARUISI Hiroaki 2430b3b4aa74SDavid Sterba btrfs_release_path(path); 243198d377a0STARUISI Hiroaki key.objectid = key.offset; 24328ad6fcabSChris Mason key.offset = (u64)-1; 243398d377a0STARUISI Hiroaki dirid = key.objectid; 243498d377a0STARUISI Hiroaki } 243577906a50SLi Zefan memmove(name, ptr, total_len); 243698d377a0STARUISI Hiroaki name[total_len] = '\0'; 243798d377a0STARUISI Hiroaki ret = 0; 243898d377a0STARUISI Hiroaki out: 243900246528SJosef Bacik btrfs_put_root(root); 244098d377a0STARUISI Hiroaki btrfs_free_path(path); 2441ac8e9819SChris Mason return ret; 2442ac8e9819SChris Mason } 2443ac8e9819SChris Mason 244423d0b79dSTomohiro Misono static int btrfs_search_path_in_tree_user(struct inode *inode, 244523d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args) 244623d0b79dSTomohiro Misono { 244723d0b79dSTomohiro Misono struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; 244823d0b79dSTomohiro Misono struct super_block *sb = inode->i_sb; 244923d0b79dSTomohiro Misono struct btrfs_key upper_limit = BTRFS_I(inode)->location; 245023d0b79dSTomohiro Misono u64 treeid = BTRFS_I(inode)->root->root_key.objectid; 245123d0b79dSTomohiro Misono u64 dirid = args->dirid; 245223d0b79dSTomohiro Misono unsigned long item_off; 245323d0b79dSTomohiro Misono unsigned long item_len; 245423d0b79dSTomohiro Misono struct btrfs_inode_ref *iref; 245523d0b79dSTomohiro Misono struct btrfs_root_ref *rref; 2456b8a49ae1SJosef Bacik struct btrfs_root *root = NULL; 245723d0b79dSTomohiro Misono struct btrfs_path *path; 245823d0b79dSTomohiro Misono struct btrfs_key key, key2; 245923d0b79dSTomohiro Misono struct extent_buffer *leaf; 246023d0b79dSTomohiro Misono struct inode *temp_inode; 246123d0b79dSTomohiro Misono char *ptr; 246223d0b79dSTomohiro Misono int slot; 246323d0b79dSTomohiro Misono int len; 246423d0b79dSTomohiro Misono int total_len = 0; 246523d0b79dSTomohiro Misono int ret; 246623d0b79dSTomohiro Misono 246723d0b79dSTomohiro Misono path = btrfs_alloc_path(); 246823d0b79dSTomohiro Misono if (!path) 246923d0b79dSTomohiro Misono return -ENOMEM; 247023d0b79dSTomohiro Misono 247123d0b79dSTomohiro Misono /* 247223d0b79dSTomohiro Misono * If the bottom subvolume does not exist directly under upper_limit, 247323d0b79dSTomohiro Misono * construct the path in from the bottom up. 247423d0b79dSTomohiro Misono */ 247523d0b79dSTomohiro Misono if (dirid != upper_limit.objectid) { 247623d0b79dSTomohiro Misono ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; 247723d0b79dSTomohiro Misono 247856e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, treeid, true); 247923d0b79dSTomohiro Misono if (IS_ERR(root)) { 248023d0b79dSTomohiro Misono ret = PTR_ERR(root); 248123d0b79dSTomohiro Misono goto out; 248223d0b79dSTomohiro Misono } 248323d0b79dSTomohiro Misono 248423d0b79dSTomohiro Misono key.objectid = dirid; 248523d0b79dSTomohiro Misono key.type = BTRFS_INODE_REF_KEY; 248623d0b79dSTomohiro Misono key.offset = (u64)-1; 248723d0b79dSTomohiro Misono while (1) { 248823d0b79dSTomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 248923d0b79dSTomohiro Misono if (ret < 0) { 2490b8a49ae1SJosef Bacik goto out_put; 249123d0b79dSTomohiro Misono } else if (ret > 0) { 249223d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 249323d0b79dSTomohiro Misono BTRFS_INODE_REF_KEY); 249423d0b79dSTomohiro Misono if (ret < 0) { 2495b8a49ae1SJosef Bacik goto out_put; 249623d0b79dSTomohiro Misono } else if (ret > 0) { 249723d0b79dSTomohiro Misono ret = -ENOENT; 2498b8a49ae1SJosef Bacik goto out_put; 249923d0b79dSTomohiro Misono } 250023d0b79dSTomohiro Misono } 250123d0b79dSTomohiro Misono 250223d0b79dSTomohiro Misono leaf = path->nodes[0]; 250323d0b79dSTomohiro Misono slot = path->slots[0]; 250423d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 250523d0b79dSTomohiro Misono 250623d0b79dSTomohiro Misono iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); 250723d0b79dSTomohiro Misono len = btrfs_inode_ref_name_len(leaf, iref); 250823d0b79dSTomohiro Misono ptr -= len + 1; 250923d0b79dSTomohiro Misono total_len += len + 1; 251023d0b79dSTomohiro Misono if (ptr < args->path) { 251123d0b79dSTomohiro Misono ret = -ENAMETOOLONG; 2512b8a49ae1SJosef Bacik goto out_put; 251323d0b79dSTomohiro Misono } 251423d0b79dSTomohiro Misono 251523d0b79dSTomohiro Misono *(ptr + len) = '/'; 251623d0b79dSTomohiro Misono read_extent_buffer(leaf, ptr, 251723d0b79dSTomohiro Misono (unsigned long)(iref + 1), len); 251823d0b79dSTomohiro Misono 251923d0b79dSTomohiro Misono /* Check the read+exec permission of this directory */ 252023d0b79dSTomohiro Misono ret = btrfs_previous_item(root, path, dirid, 252123d0b79dSTomohiro Misono BTRFS_INODE_ITEM_KEY); 252223d0b79dSTomohiro Misono if (ret < 0) { 2523b8a49ae1SJosef Bacik goto out_put; 252423d0b79dSTomohiro Misono } else if (ret > 0) { 252523d0b79dSTomohiro Misono ret = -ENOENT; 2526b8a49ae1SJosef Bacik goto out_put; 252723d0b79dSTomohiro Misono } 252823d0b79dSTomohiro Misono 252923d0b79dSTomohiro Misono leaf = path->nodes[0]; 253023d0b79dSTomohiro Misono slot = path->slots[0]; 253123d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key2, slot); 253223d0b79dSTomohiro Misono if (key2.objectid != dirid) { 253323d0b79dSTomohiro Misono ret = -ENOENT; 2534b8a49ae1SJosef Bacik goto out_put; 253523d0b79dSTomohiro Misono } 253623d0b79dSTomohiro Misono 25370202e83fSDavid Sterba temp_inode = btrfs_iget(sb, key2.objectid, root); 25383ca57bd6SMisono Tomohiro if (IS_ERR(temp_inode)) { 25393ca57bd6SMisono Tomohiro ret = PTR_ERR(temp_inode); 2540b8a49ae1SJosef Bacik goto out_put; 25413ca57bd6SMisono Tomohiro } 254223d0b79dSTomohiro Misono ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC); 254323d0b79dSTomohiro Misono iput(temp_inode); 254423d0b79dSTomohiro Misono if (ret) { 254523d0b79dSTomohiro Misono ret = -EACCES; 2546b8a49ae1SJosef Bacik goto out_put; 254723d0b79dSTomohiro Misono } 254823d0b79dSTomohiro Misono 254923d0b79dSTomohiro Misono if (key.offset == upper_limit.objectid) 255023d0b79dSTomohiro Misono break; 255123d0b79dSTomohiro Misono if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { 255223d0b79dSTomohiro Misono ret = -EACCES; 2553b8a49ae1SJosef Bacik goto out_put; 255423d0b79dSTomohiro Misono } 255523d0b79dSTomohiro Misono 255623d0b79dSTomohiro Misono btrfs_release_path(path); 255723d0b79dSTomohiro Misono key.objectid = key.offset; 255823d0b79dSTomohiro Misono key.offset = (u64)-1; 255923d0b79dSTomohiro Misono dirid = key.objectid; 256023d0b79dSTomohiro Misono } 256123d0b79dSTomohiro Misono 256223d0b79dSTomohiro Misono memmove(args->path, ptr, total_len); 256323d0b79dSTomohiro Misono args->path[total_len] = '\0'; 256400246528SJosef Bacik btrfs_put_root(root); 2565b8a49ae1SJosef Bacik root = NULL; 256623d0b79dSTomohiro Misono btrfs_release_path(path); 256723d0b79dSTomohiro Misono } 256823d0b79dSTomohiro Misono 256923d0b79dSTomohiro Misono /* Get the bottom subvolume's name from ROOT_REF */ 257023d0b79dSTomohiro Misono key.objectid = treeid; 257123d0b79dSTomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 257223d0b79dSTomohiro Misono key.offset = args->treeid; 2573b8a49ae1SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 257423d0b79dSTomohiro Misono if (ret < 0) { 257523d0b79dSTomohiro Misono goto out; 257623d0b79dSTomohiro Misono } else if (ret > 0) { 257723d0b79dSTomohiro Misono ret = -ENOENT; 257823d0b79dSTomohiro Misono goto out; 257923d0b79dSTomohiro Misono } 258023d0b79dSTomohiro Misono 258123d0b79dSTomohiro Misono leaf = path->nodes[0]; 258223d0b79dSTomohiro Misono slot = path->slots[0]; 258323d0b79dSTomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 258423d0b79dSTomohiro Misono 258523d0b79dSTomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot); 258623d0b79dSTomohiro Misono item_len = btrfs_item_size_nr(leaf, slot); 258723d0b79dSTomohiro Misono /* Check if dirid in ROOT_REF corresponds to passed dirid */ 258823d0b79dSTomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 258923d0b79dSTomohiro Misono if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { 259023d0b79dSTomohiro Misono ret = -EINVAL; 259123d0b79dSTomohiro Misono goto out; 259223d0b79dSTomohiro Misono } 259323d0b79dSTomohiro Misono 259423d0b79dSTomohiro Misono /* Copy subvolume's name */ 259523d0b79dSTomohiro Misono item_off += sizeof(struct btrfs_root_ref); 259623d0b79dSTomohiro Misono item_len -= sizeof(struct btrfs_root_ref); 259723d0b79dSTomohiro Misono read_extent_buffer(leaf, args->name, item_off, item_len); 259823d0b79dSTomohiro Misono args->name[item_len] = 0; 259923d0b79dSTomohiro Misono 2600b8a49ae1SJosef Bacik out_put: 260100246528SJosef Bacik btrfs_put_root(root); 260223d0b79dSTomohiro Misono out: 260323d0b79dSTomohiro Misono btrfs_free_path(path); 260423d0b79dSTomohiro Misono return ret; 260523d0b79dSTomohiro Misono } 260623d0b79dSTomohiro Misono 2607ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 2608ac8e9819SChris Mason void __user *argp) 2609ac8e9819SChris Mason { 2610ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 2611ac8e9819SChris Mason struct inode *inode; 261201b810b8SDavid Sterba int ret = 0; 2613ac8e9819SChris Mason 26142354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 26152354d08fSJulia Lawall if (IS_ERR(args)) 26162354d08fSJulia Lawall return PTR_ERR(args); 2617c2b96929SDan Carpenter 2618496ad9aaSAl Viro inode = file_inode(file); 2619ac8e9819SChris Mason 262001b810b8SDavid Sterba /* 262101b810b8SDavid Sterba * Unprivileged query to obtain the containing subvolume root id. The 262201b810b8SDavid Sterba * path is reset so it's consistent with btrfs_search_path_in_tree. 262301b810b8SDavid Sterba */ 26241b53ac4dSChris Mason if (args->treeid == 0) 26251b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 26261b53ac4dSChris Mason 262701b810b8SDavid Sterba if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { 262801b810b8SDavid Sterba args->name[0] = 0; 262901b810b8SDavid Sterba goto out; 263001b810b8SDavid Sterba } 263101b810b8SDavid Sterba 263201b810b8SDavid Sterba if (!capable(CAP_SYS_ADMIN)) { 263301b810b8SDavid Sterba ret = -EPERM; 263401b810b8SDavid Sterba goto out; 263501b810b8SDavid Sterba } 263601b810b8SDavid Sterba 2637ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 2638ac8e9819SChris Mason args->treeid, args->objectid, 2639ac8e9819SChris Mason args->name); 2640ac8e9819SChris Mason 264101b810b8SDavid Sterba out: 2642ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 2643ac8e9819SChris Mason ret = -EFAULT; 2644ac8e9819SChris Mason 2645ac8e9819SChris Mason kfree(args); 264698d377a0STARUISI Hiroaki return ret; 264798d377a0STARUISI Hiroaki } 264898d377a0STARUISI Hiroaki 264923d0b79dSTomohiro Misono /* 265023d0b79dSTomohiro Misono * Version of ino_lookup ioctl (unprivileged) 265123d0b79dSTomohiro Misono * 265223d0b79dSTomohiro Misono * The main differences from ino_lookup ioctl are: 265323d0b79dSTomohiro Misono * 265423d0b79dSTomohiro Misono * 1. Read + Exec permission will be checked using inode_permission() during 265523d0b79dSTomohiro Misono * path construction. -EACCES will be returned in case of failure. 265623d0b79dSTomohiro Misono * 2. Path construction will be stopped at the inode number which corresponds 265723d0b79dSTomohiro Misono * to the fd with which this ioctl is called. If constructed path does not 265823d0b79dSTomohiro Misono * exist under fd's inode, -EACCES will be returned. 265923d0b79dSTomohiro Misono * 3. The name of bottom subvolume is also searched and filled. 266023d0b79dSTomohiro Misono */ 266123d0b79dSTomohiro Misono static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) 266223d0b79dSTomohiro Misono { 266323d0b79dSTomohiro Misono struct btrfs_ioctl_ino_lookup_user_args *args; 266423d0b79dSTomohiro Misono struct inode *inode; 266523d0b79dSTomohiro Misono int ret; 266623d0b79dSTomohiro Misono 266723d0b79dSTomohiro Misono args = memdup_user(argp, sizeof(*args)); 266823d0b79dSTomohiro Misono if (IS_ERR(args)) 266923d0b79dSTomohiro Misono return PTR_ERR(args); 267023d0b79dSTomohiro Misono 267123d0b79dSTomohiro Misono inode = file_inode(file); 267223d0b79dSTomohiro Misono 267323d0b79dSTomohiro Misono if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && 267423d0b79dSTomohiro Misono BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { 267523d0b79dSTomohiro Misono /* 267623d0b79dSTomohiro Misono * The subvolume does not exist under fd with which this is 267723d0b79dSTomohiro Misono * called 267823d0b79dSTomohiro Misono */ 267923d0b79dSTomohiro Misono kfree(args); 268023d0b79dSTomohiro Misono return -EACCES; 268123d0b79dSTomohiro Misono } 268223d0b79dSTomohiro Misono 268323d0b79dSTomohiro Misono ret = btrfs_search_path_in_tree_user(inode, args); 268423d0b79dSTomohiro Misono 268523d0b79dSTomohiro Misono if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 268623d0b79dSTomohiro Misono ret = -EFAULT; 268723d0b79dSTomohiro Misono 268823d0b79dSTomohiro Misono kfree(args); 268923d0b79dSTomohiro Misono return ret; 269023d0b79dSTomohiro Misono } 269123d0b79dSTomohiro Misono 2692b64ec075STomohiro Misono /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ 2693b64ec075STomohiro Misono static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) 2694b64ec075STomohiro Misono { 2695b64ec075STomohiro Misono struct btrfs_ioctl_get_subvol_info_args *subvol_info; 2696b64ec075STomohiro Misono struct btrfs_fs_info *fs_info; 2697b64ec075STomohiro Misono struct btrfs_root *root; 2698b64ec075STomohiro Misono struct btrfs_path *path; 2699b64ec075STomohiro Misono struct btrfs_key key; 2700b64ec075STomohiro Misono struct btrfs_root_item *root_item; 2701b64ec075STomohiro Misono struct btrfs_root_ref *rref; 2702b64ec075STomohiro Misono struct extent_buffer *leaf; 2703b64ec075STomohiro Misono unsigned long item_off; 2704b64ec075STomohiro Misono unsigned long item_len; 2705b64ec075STomohiro Misono struct inode *inode; 2706b64ec075STomohiro Misono int slot; 2707b64ec075STomohiro Misono int ret = 0; 2708b64ec075STomohiro Misono 2709b64ec075STomohiro Misono path = btrfs_alloc_path(); 2710b64ec075STomohiro Misono if (!path) 2711b64ec075STomohiro Misono return -ENOMEM; 2712b64ec075STomohiro Misono 2713b64ec075STomohiro Misono subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); 2714b64ec075STomohiro Misono if (!subvol_info) { 2715b64ec075STomohiro Misono btrfs_free_path(path); 2716b64ec075STomohiro Misono return -ENOMEM; 2717b64ec075STomohiro Misono } 2718b64ec075STomohiro Misono 2719b64ec075STomohiro Misono inode = file_inode(file); 2720b64ec075STomohiro Misono fs_info = BTRFS_I(inode)->root->fs_info; 2721b64ec075STomohiro Misono 2722b64ec075STomohiro Misono /* Get root_item of inode's subvolume */ 2723b64ec075STomohiro Misono key.objectid = BTRFS_I(inode)->root->root_key.objectid; 272456e9357aSDavid Sterba root = btrfs_get_fs_root(fs_info, key.objectid, true); 2725b64ec075STomohiro Misono if (IS_ERR(root)) { 2726b64ec075STomohiro Misono ret = PTR_ERR(root); 272704734e84SJosef Bacik goto out_free; 272804734e84SJosef Bacik } 2729b64ec075STomohiro Misono root_item = &root->root_item; 2730b64ec075STomohiro Misono 2731b64ec075STomohiro Misono subvol_info->treeid = key.objectid; 2732b64ec075STomohiro Misono 2733b64ec075STomohiro Misono subvol_info->generation = btrfs_root_generation(root_item); 2734b64ec075STomohiro Misono subvol_info->flags = btrfs_root_flags(root_item); 2735b64ec075STomohiro Misono 2736b64ec075STomohiro Misono memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); 2737b64ec075STomohiro Misono memcpy(subvol_info->parent_uuid, root_item->parent_uuid, 2738b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2739b64ec075STomohiro Misono memcpy(subvol_info->received_uuid, root_item->received_uuid, 2740b64ec075STomohiro Misono BTRFS_UUID_SIZE); 2741b64ec075STomohiro Misono 2742b64ec075STomohiro Misono subvol_info->ctransid = btrfs_root_ctransid(root_item); 2743b64ec075STomohiro Misono subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); 2744b64ec075STomohiro Misono subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); 2745b64ec075STomohiro Misono 2746b64ec075STomohiro Misono subvol_info->otransid = btrfs_root_otransid(root_item); 2747b64ec075STomohiro Misono subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); 2748b64ec075STomohiro Misono subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); 2749b64ec075STomohiro Misono 2750b64ec075STomohiro Misono subvol_info->stransid = btrfs_root_stransid(root_item); 2751b64ec075STomohiro Misono subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); 2752b64ec075STomohiro Misono subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); 2753b64ec075STomohiro Misono 2754b64ec075STomohiro Misono subvol_info->rtransid = btrfs_root_rtransid(root_item); 2755b64ec075STomohiro Misono subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); 2756b64ec075STomohiro Misono subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); 2757b64ec075STomohiro Misono 2758b64ec075STomohiro Misono if (key.objectid != BTRFS_FS_TREE_OBJECTID) { 2759b64ec075STomohiro Misono /* Search root tree for ROOT_BACKREF of this subvolume */ 2760b64ec075STomohiro Misono key.type = BTRFS_ROOT_BACKREF_KEY; 2761b64ec075STomohiro Misono key.offset = 0; 276204734e84SJosef Bacik ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); 2763b64ec075STomohiro Misono if (ret < 0) { 2764b64ec075STomohiro Misono goto out; 2765b64ec075STomohiro Misono } else if (path->slots[0] >= 2766b64ec075STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 276704734e84SJosef Bacik ret = btrfs_next_leaf(fs_info->tree_root, path); 2768b64ec075STomohiro Misono if (ret < 0) { 2769b64ec075STomohiro Misono goto out; 2770b64ec075STomohiro Misono } else if (ret > 0) { 2771b64ec075STomohiro Misono ret = -EUCLEAN; 2772b64ec075STomohiro Misono goto out; 2773b64ec075STomohiro Misono } 2774b64ec075STomohiro Misono } 2775b64ec075STomohiro Misono 2776b64ec075STomohiro Misono leaf = path->nodes[0]; 2777b64ec075STomohiro Misono slot = path->slots[0]; 2778b64ec075STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 2779b64ec075STomohiro Misono if (key.objectid == subvol_info->treeid && 2780b64ec075STomohiro Misono key.type == BTRFS_ROOT_BACKREF_KEY) { 2781b64ec075STomohiro Misono subvol_info->parent_id = key.offset; 2782b64ec075STomohiro Misono 2783b64ec075STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 2784b64ec075STomohiro Misono subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); 2785b64ec075STomohiro Misono 2786b64ec075STomohiro Misono item_off = btrfs_item_ptr_offset(leaf, slot) 2787b64ec075STomohiro Misono + sizeof(struct btrfs_root_ref); 2788b64ec075STomohiro Misono item_len = btrfs_item_size_nr(leaf, slot) 2789b64ec075STomohiro Misono - sizeof(struct btrfs_root_ref); 2790b64ec075STomohiro Misono read_extent_buffer(leaf, subvol_info->name, 2791b64ec075STomohiro Misono item_off, item_len); 2792b64ec075STomohiro Misono } else { 2793b64ec075STomohiro Misono ret = -ENOENT; 2794b64ec075STomohiro Misono goto out; 2795b64ec075STomohiro Misono } 2796b64ec075STomohiro Misono } 2797b64ec075STomohiro Misono 2798b64ec075STomohiro Misono if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) 2799b64ec075STomohiro Misono ret = -EFAULT; 2800b64ec075STomohiro Misono 2801b64ec075STomohiro Misono out: 280200246528SJosef Bacik btrfs_put_root(root); 280304734e84SJosef Bacik out_free: 2804b64ec075STomohiro Misono btrfs_free_path(path); 2805b091f7feSWaiman Long kfree(subvol_info); 2806b64ec075STomohiro Misono return ret; 2807b64ec075STomohiro Misono } 2808b64ec075STomohiro Misono 280942e4b520STomohiro Misono /* 281042e4b520STomohiro Misono * Return ROOT_REF information of the subvolume containing this inode 281142e4b520STomohiro Misono * except the subvolume name. 281242e4b520STomohiro Misono */ 281342e4b520STomohiro Misono static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) 281442e4b520STomohiro Misono { 281542e4b520STomohiro Misono struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; 281642e4b520STomohiro Misono struct btrfs_root_ref *rref; 281742e4b520STomohiro Misono struct btrfs_root *root; 281842e4b520STomohiro Misono struct btrfs_path *path; 281942e4b520STomohiro Misono struct btrfs_key key; 282042e4b520STomohiro Misono struct extent_buffer *leaf; 282142e4b520STomohiro Misono struct inode *inode; 282242e4b520STomohiro Misono u64 objectid; 282342e4b520STomohiro Misono int slot; 282442e4b520STomohiro Misono int ret; 282542e4b520STomohiro Misono u8 found; 282642e4b520STomohiro Misono 282742e4b520STomohiro Misono path = btrfs_alloc_path(); 282842e4b520STomohiro Misono if (!path) 282942e4b520STomohiro Misono return -ENOMEM; 283042e4b520STomohiro Misono 283142e4b520STomohiro Misono rootrefs = memdup_user(argp, sizeof(*rootrefs)); 283242e4b520STomohiro Misono if (IS_ERR(rootrefs)) { 283342e4b520STomohiro Misono btrfs_free_path(path); 283442e4b520STomohiro Misono return PTR_ERR(rootrefs); 283542e4b520STomohiro Misono } 283642e4b520STomohiro Misono 283742e4b520STomohiro Misono inode = file_inode(file); 283842e4b520STomohiro Misono root = BTRFS_I(inode)->root->fs_info->tree_root; 283942e4b520STomohiro Misono objectid = BTRFS_I(inode)->root->root_key.objectid; 284042e4b520STomohiro Misono 284142e4b520STomohiro Misono key.objectid = objectid; 284242e4b520STomohiro Misono key.type = BTRFS_ROOT_REF_KEY; 284342e4b520STomohiro Misono key.offset = rootrefs->min_treeid; 284442e4b520STomohiro Misono found = 0; 284542e4b520STomohiro Misono 284642e4b520STomohiro Misono ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 284742e4b520STomohiro Misono if (ret < 0) { 284842e4b520STomohiro Misono goto out; 284942e4b520STomohiro Misono } else if (path->slots[0] >= 285042e4b520STomohiro Misono btrfs_header_nritems(path->nodes[0])) { 285142e4b520STomohiro Misono ret = btrfs_next_leaf(root, path); 285242e4b520STomohiro Misono if (ret < 0) { 285342e4b520STomohiro Misono goto out; 285442e4b520STomohiro Misono } else if (ret > 0) { 285542e4b520STomohiro Misono ret = -EUCLEAN; 285642e4b520STomohiro Misono goto out; 285742e4b520STomohiro Misono } 285842e4b520STomohiro Misono } 285942e4b520STomohiro Misono while (1) { 286042e4b520STomohiro Misono leaf = path->nodes[0]; 286142e4b520STomohiro Misono slot = path->slots[0]; 286242e4b520STomohiro Misono 286342e4b520STomohiro Misono btrfs_item_key_to_cpu(leaf, &key, slot); 286442e4b520STomohiro Misono if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { 286542e4b520STomohiro Misono ret = 0; 286642e4b520STomohiro Misono goto out; 286742e4b520STomohiro Misono } 286842e4b520STomohiro Misono 286942e4b520STomohiro Misono if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { 287042e4b520STomohiro Misono ret = -EOVERFLOW; 287142e4b520STomohiro Misono goto out; 287242e4b520STomohiro Misono } 287342e4b520STomohiro Misono 287442e4b520STomohiro Misono rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); 287542e4b520STomohiro Misono rootrefs->rootref[found].treeid = key.offset; 287642e4b520STomohiro Misono rootrefs->rootref[found].dirid = 287742e4b520STomohiro Misono btrfs_root_ref_dirid(leaf, rref); 287842e4b520STomohiro Misono found++; 287942e4b520STomohiro Misono 288042e4b520STomohiro Misono ret = btrfs_next_item(root, path); 288142e4b520STomohiro Misono if (ret < 0) { 288242e4b520STomohiro Misono goto out; 288342e4b520STomohiro Misono } else if (ret > 0) { 288442e4b520STomohiro Misono ret = -EUCLEAN; 288542e4b520STomohiro Misono goto out; 288642e4b520STomohiro Misono } 288742e4b520STomohiro Misono } 288842e4b520STomohiro Misono 288942e4b520STomohiro Misono out: 289042e4b520STomohiro Misono if (!ret || ret == -EOVERFLOW) { 289142e4b520STomohiro Misono rootrefs->num_items = found; 289242e4b520STomohiro Misono /* update min_treeid for next search */ 289342e4b520STomohiro Misono if (found) 289442e4b520STomohiro Misono rootrefs->min_treeid = 289542e4b520STomohiro Misono rootrefs->rootref[found - 1].treeid + 1; 289642e4b520STomohiro Misono if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) 289742e4b520STomohiro Misono ret = -EFAULT; 289842e4b520STomohiro Misono } 289942e4b520STomohiro Misono 290042e4b520STomohiro Misono kfree(rootrefs); 290142e4b520STomohiro Misono btrfs_free_path(path); 290242e4b520STomohiro Misono 290342e4b520STomohiro Misono return ret; 290442e4b520STomohiro Misono } 290542e4b520STomohiro Misono 290676dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 2907949964c9SMarcos Paulo de Souza void __user *arg, 2908949964c9SMarcos Paulo de Souza bool destroy_v2) 290976dda93cSYan, Zheng { 291054563d41SAl Viro struct dentry *parent = file->f_path.dentry; 29110b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); 291276dda93cSYan, Zheng struct dentry *dentry; 29132b0143b5SDavid Howells struct inode *dir = d_inode(parent); 291476dda93cSYan, Zheng struct inode *inode; 291576dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 291676dda93cSYan, Zheng struct btrfs_root *dest = NULL; 2917949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args *vol_args = NULL; 2918949964c9SMarcos Paulo de Souza struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; 2919949964c9SMarcos Paulo de Souza char *subvol_name, *subvol_name_ptr = NULL; 2920949964c9SMarcos Paulo de Souza int subvol_namelen; 292176dda93cSYan, Zheng int err = 0; 2922949964c9SMarcos Paulo de Souza bool destroy_parent = false; 292376dda93cSYan, Zheng 2924949964c9SMarcos Paulo de Souza if (destroy_v2) { 2925949964c9SMarcos Paulo de Souza vol_args2 = memdup_user(arg, sizeof(*vol_args2)); 2926949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args2)) 2927949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args2); 2928325c50e3SJeff Mahoney 2929949964c9SMarcos Paulo de Souza if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { 2930949964c9SMarcos Paulo de Souza err = -EOPNOTSUPP; 2931949964c9SMarcos Paulo de Souza goto out; 2932949964c9SMarcos Paulo de Souza } 293376dda93cSYan, Zheng 2934949964c9SMarcos Paulo de Souza /* 2935949964c9SMarcos Paulo de Souza * If SPEC_BY_ID is not set, we are looking for the subvolume by 2936949964c9SMarcos Paulo de Souza * name, same as v1 currently does. 2937949964c9SMarcos Paulo de Souza */ 2938949964c9SMarcos Paulo de Souza if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { 2939949964c9SMarcos Paulo de Souza vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; 2940949964c9SMarcos Paulo de Souza subvol_name = vol_args2->name; 2941949964c9SMarcos Paulo de Souza 2942949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 2943949964c9SMarcos Paulo de Souza if (err) 2944949964c9SMarcos Paulo de Souza goto out; 2945949964c9SMarcos Paulo de Souza } else { 2946949964c9SMarcos Paulo de Souza if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { 294776dda93cSYan, Zheng err = -EINVAL; 294876dda93cSYan, Zheng goto out; 294976dda93cSYan, Zheng } 295076dda93cSYan, Zheng 2951a561be71SAl Viro err = mnt_want_write_file(file); 295276dda93cSYan, Zheng if (err) 295376dda93cSYan, Zheng goto out; 295476dda93cSYan, Zheng 2955949964c9SMarcos Paulo de Souza dentry = btrfs_get_dentry(fs_info->sb, 2956949964c9SMarcos Paulo de Souza BTRFS_FIRST_FREE_OBJECTID, 2957949964c9SMarcos Paulo de Souza vol_args2->subvolid, 0, 0); 2958949964c9SMarcos Paulo de Souza if (IS_ERR(dentry)) { 2959949964c9SMarcos Paulo de Souza err = PTR_ERR(dentry); 2960949964c9SMarcos Paulo de Souza goto out_drop_write; 2961949964c9SMarcos Paulo de Souza } 2962949964c9SMarcos Paulo de Souza 2963949964c9SMarcos Paulo de Souza /* 2964949964c9SMarcos Paulo de Souza * Change the default parent since the subvolume being 2965949964c9SMarcos Paulo de Souza * deleted can be outside of the current mount point. 2966949964c9SMarcos Paulo de Souza */ 2967949964c9SMarcos Paulo de Souza parent = btrfs_get_parent(dentry); 2968949964c9SMarcos Paulo de Souza 2969949964c9SMarcos Paulo de Souza /* 2970949964c9SMarcos Paulo de Souza * At this point dentry->d_name can point to '/' if the 2971949964c9SMarcos Paulo de Souza * subvolume we want to destroy is outsite of the 2972949964c9SMarcos Paulo de Souza * current mount point, so we need to release the 2973949964c9SMarcos Paulo de Souza * current dentry and execute the lookup to return a new 2974949964c9SMarcos Paulo de Souza * one with ->d_name pointing to the 2975949964c9SMarcos Paulo de Souza * <mount point>/subvol_name. 2976949964c9SMarcos Paulo de Souza */ 2977949964c9SMarcos Paulo de Souza dput(dentry); 2978949964c9SMarcos Paulo de Souza if (IS_ERR(parent)) { 2979949964c9SMarcos Paulo de Souza err = PTR_ERR(parent); 2980949964c9SMarcos Paulo de Souza goto out_drop_write; 2981949964c9SMarcos Paulo de Souza } 2982949964c9SMarcos Paulo de Souza dir = d_inode(parent); 2983949964c9SMarcos Paulo de Souza 2984949964c9SMarcos Paulo de Souza /* 2985949964c9SMarcos Paulo de Souza * If v2 was used with SPEC_BY_ID, a new parent was 2986949964c9SMarcos Paulo de Souza * allocated since the subvolume can be outside of the 2987949964c9SMarcos Paulo de Souza * current mount point. Later on we need to release this 2988949964c9SMarcos Paulo de Souza * new parent dentry. 2989949964c9SMarcos Paulo de Souza */ 2990949964c9SMarcos Paulo de Souza destroy_parent = true; 2991949964c9SMarcos Paulo de Souza 2992949964c9SMarcos Paulo de Souza subvol_name_ptr = btrfs_get_subvol_name_from_objectid( 2993949964c9SMarcos Paulo de Souza fs_info, vol_args2->subvolid); 2994949964c9SMarcos Paulo de Souza if (IS_ERR(subvol_name_ptr)) { 2995949964c9SMarcos Paulo de Souza err = PTR_ERR(subvol_name_ptr); 2996949964c9SMarcos Paulo de Souza goto free_parent; 2997949964c9SMarcos Paulo de Souza } 2998949964c9SMarcos Paulo de Souza /* subvol_name_ptr is already NULL termined */ 2999949964c9SMarcos Paulo de Souza subvol_name = (char *)kbasename(subvol_name_ptr); 3000949964c9SMarcos Paulo de Souza } 3001949964c9SMarcos Paulo de Souza } else { 3002949964c9SMarcos Paulo de Souza vol_args = memdup_user(arg, sizeof(*vol_args)); 3003949964c9SMarcos Paulo de Souza if (IS_ERR(vol_args)) 3004949964c9SMarcos Paulo de Souza return PTR_ERR(vol_args); 3005949964c9SMarcos Paulo de Souza 3006949964c9SMarcos Paulo de Souza vol_args->name[BTRFS_PATH_NAME_MAX] = 0; 3007949964c9SMarcos Paulo de Souza subvol_name = vol_args->name; 3008949964c9SMarcos Paulo de Souza 3009949964c9SMarcos Paulo de Souza err = mnt_want_write_file(file); 3010949964c9SMarcos Paulo de Souza if (err) 3011949964c9SMarcos Paulo de Souza goto out; 3012949964c9SMarcos Paulo de Souza } 3013949964c9SMarcos Paulo de Souza 3014949964c9SMarcos Paulo de Souza subvol_namelen = strlen(subvol_name); 3015949964c9SMarcos Paulo de Souza 3016949964c9SMarcos Paulo de Souza if (strchr(subvol_name, '/') || 3017949964c9SMarcos Paulo de Souza strncmp(subvol_name, "..", subvol_namelen) == 0) { 3018949964c9SMarcos Paulo de Souza err = -EINVAL; 3019949964c9SMarcos Paulo de Souza goto free_subvol_name; 3020949964c9SMarcos Paulo de Souza } 3021949964c9SMarcos Paulo de Souza 3022949964c9SMarcos Paulo de Souza if (!S_ISDIR(dir->i_mode)) { 3023949964c9SMarcos Paulo de Souza err = -ENOTDIR; 3024949964c9SMarcos Paulo de Souza goto free_subvol_name; 3025949964c9SMarcos Paulo de Souza } 3026521e0546SDavid Sterba 302700235411SAl Viro err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); 302800235411SAl Viro if (err == -EINTR) 3029949964c9SMarcos Paulo de Souza goto free_subvol_name; 3030949964c9SMarcos Paulo de Souza dentry = lookup_one_len(subvol_name, parent, subvol_namelen); 303176dda93cSYan, Zheng if (IS_ERR(dentry)) { 303276dda93cSYan, Zheng err = PTR_ERR(dentry); 303376dda93cSYan, Zheng goto out_unlock_dir; 303476dda93cSYan, Zheng } 303576dda93cSYan, Zheng 30362b0143b5SDavid Howells if (d_really_is_negative(dentry)) { 303776dda93cSYan, Zheng err = -ENOENT; 303876dda93cSYan, Zheng goto out_dput; 303976dda93cSYan, Zheng } 304076dda93cSYan, Zheng 30412b0143b5SDavid Howells inode = d_inode(dentry); 30424260f7c7SSage Weil dest = BTRFS_I(inode)->root; 30434260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)) { 30444260f7c7SSage Weil /* 30454260f7c7SSage Weil * Regular user. Only allow this with a special mount 30464260f7c7SSage Weil * option, when the user has write+exec access to the 30474260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 30484260f7c7SSage Weil * allowed. 30494260f7c7SSage Weil * 30504260f7c7SSage Weil * Note that this is _not_ check that the subvol is 30514260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 30524260f7c7SSage Weil * otherwise be able to delete. 30534260f7c7SSage Weil * 30544260f7c7SSage Weil * Users who want to delete empty subvols should try 30554260f7c7SSage Weil * rmdir(2). 30564260f7c7SSage Weil */ 30574260f7c7SSage Weil err = -EPERM; 30580b246afaSJeff Mahoney if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) 30594260f7c7SSage Weil goto out_dput; 30604260f7c7SSage Weil 30614260f7c7SSage Weil /* 30624260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 30634260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 30644260f7c7SSage Weil * must be called on the dentry referencing the root 30654260f7c7SSage Weil * of the subvol, not a random directory contained 30664260f7c7SSage Weil * within it. 30674260f7c7SSage Weil */ 30684260f7c7SSage Weil err = -EINVAL; 30694260f7c7SSage Weil if (root == dest) 30704260f7c7SSage Weil goto out_dput; 30714260f7c7SSage Weil 30724260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 30734260f7c7SSage Weil if (err) 30744260f7c7SSage Weil goto out_dput; 30755c39da5bSMiao Xie } 30764260f7c7SSage Weil 30775c39da5bSMiao Xie /* check if subvolume may be deleted by a user */ 30784260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 30794260f7c7SSage Weil if (err) 30804260f7c7SSage Weil goto out_dput; 30814260f7c7SSage Weil 30824a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 308376dda93cSYan, Zheng err = -EINVAL; 308476dda93cSYan, Zheng goto out_dput; 308576dda93cSYan, Zheng } 308676dda93cSYan, Zheng 30875955102cSAl Viro inode_lock(inode); 3088f60a2364SMisono Tomohiro err = btrfs_delete_subvolume(dir, dentry); 30895955102cSAl Viro inode_unlock(inode); 309046008d9dSAmir Goldstein if (!err) { 309146008d9dSAmir Goldstein fsnotify_rmdir(dir, dentry); 309276dda93cSYan, Zheng d_delete(dentry); 309346008d9dSAmir Goldstein } 3094fa6ac876SLiu Bo 309576dda93cSYan, Zheng out_dput: 309676dda93cSYan, Zheng dput(dentry); 309776dda93cSYan, Zheng out_unlock_dir: 30985955102cSAl Viro inode_unlock(dir); 3099949964c9SMarcos Paulo de Souza free_subvol_name: 3100949964c9SMarcos Paulo de Souza kfree(subvol_name_ptr); 3101949964c9SMarcos Paulo de Souza free_parent: 3102949964c9SMarcos Paulo de Souza if (destroy_parent) 3103949964c9SMarcos Paulo de Souza dput(parent); 310400235411SAl Viro out_drop_write: 31052a79f17eSAl Viro mnt_drop_write_file(file); 310676dda93cSYan, Zheng out: 3107949964c9SMarcos Paulo de Souza kfree(vol_args2); 310876dda93cSYan, Zheng kfree(vol_args); 310976dda93cSYan, Zheng return err; 311076dda93cSYan, Zheng } 311176dda93cSYan, Zheng 31121e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 3113f46b5a66SChristoph Hellwig { 3114496ad9aaSAl Viro struct inode *inode = file_inode(file); 3115f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 31161e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 3117c146afadSYan Zheng int ret; 3118c146afadSYan Zheng 311925122d15SIlya Dryomov ret = mnt_want_write_file(file); 312025122d15SIlya Dryomov if (ret) 312125122d15SIlya Dryomov return ret; 3122b83cc969SLi Zefan 312325122d15SIlya Dryomov if (btrfs_root_readonly(root)) { 312425122d15SIlya Dryomov ret = -EROFS; 312525122d15SIlya Dryomov goto out; 31265ac00addSStefan Behrens } 3127f46b5a66SChristoph Hellwig 3128f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 3129f46b5a66SChristoph Hellwig case S_IFDIR: 3130e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 3131e441d54dSChris Mason ret = -EPERM; 3132e441d54dSChris Mason goto out; 3133e441d54dSChris Mason } 3134de78b51aSEric Sandeen ret = btrfs_defrag_root(root); 3135f46b5a66SChristoph Hellwig break; 3136f46b5a66SChristoph Hellwig case S_IFREG: 3137616d374eSAdam Borowski /* 3138616d374eSAdam Borowski * Note that this does not check the file descriptor for write 3139616d374eSAdam Borowski * access. This prevents defragmenting executables that are 3140616d374eSAdam Borowski * running and allows defrag on files open in read-only mode. 3141616d374eSAdam Borowski */ 3142616d374eSAdam Borowski if (!capable(CAP_SYS_ADMIN) && 3143616d374eSAdam Borowski inode_permission(inode, MAY_WRITE)) { 3144616d374eSAdam Borowski ret = -EPERM; 3145e441d54dSChris Mason goto out; 3146e441d54dSChris Mason } 31471e701a32SChris Mason 31481e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 31491e701a32SChris Mason if (!range) { 31501e701a32SChris Mason ret = -ENOMEM; 31511e701a32SChris Mason goto out; 31521e701a32SChris Mason } 31531e701a32SChris Mason 31541e701a32SChris Mason if (argp) { 31551e701a32SChris Mason if (copy_from_user(range, argp, 31561e701a32SChris Mason sizeof(*range))) { 31571e701a32SChris Mason ret = -EFAULT; 31581e701a32SChris Mason kfree(range); 3159683be16eSDan Carpenter goto out; 31601e701a32SChris Mason } 31611e701a32SChris Mason /* compression requires us to start the IO */ 31621e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 31631e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 31641e701a32SChris Mason range->extent_thresh = (u32)-1; 31651e701a32SChris Mason } 31661e701a32SChris Mason } else { 31671e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 31681e701a32SChris Mason range->len = (u64)-1; 31691e701a32SChris Mason } 3170496ad9aaSAl Viro ret = btrfs_defrag_file(file_inode(file), file, 31717c829b72SAnand Jain range, BTRFS_OLDEST_GENERATION, 0); 31724cb5300bSChris Mason if (ret > 0) 31734cb5300bSChris Mason ret = 0; 31741e701a32SChris Mason kfree(range); 3175f46b5a66SChristoph Hellwig break; 31768929ecfaSYan, Zheng default: 31778929ecfaSYan, Zheng ret = -EINVAL; 3178f46b5a66SChristoph Hellwig } 3179e441d54dSChris Mason out: 318025122d15SIlya Dryomov mnt_drop_write_file(file); 3181e441d54dSChris Mason return ret; 3182f46b5a66SChristoph Hellwig } 3183f46b5a66SChristoph Hellwig 31842ff7e61eSJeff Mahoney static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) 3185f46b5a66SChristoph Hellwig { 3186f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3187f46b5a66SChristoph Hellwig int ret; 3188f46b5a66SChristoph Hellwig 3189e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3190e441d54dSChris Mason return -EPERM; 3191e441d54dSChris Mason 3192c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) 3193e57138b3SAnand Jain return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3194c9e9f97bSIlya Dryomov 3195dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3196c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3197c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3198c9e9f97bSIlya Dryomov goto out; 3199c9e9f97bSIlya Dryomov } 3200f46b5a66SChristoph Hellwig 32015516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32022ff7e61eSJeff Mahoney ret = btrfs_init_new_device(fs_info, vol_args->name); 3203f46b5a66SChristoph Hellwig 320443d20761SAnand Jain if (!ret) 32050b246afaSJeff Mahoney btrfs_info(fs_info, "disk added %s", vol_args->name); 320643d20761SAnand Jain 3207f46b5a66SChristoph Hellwig kfree(vol_args); 3208c9e9f97bSIlya Dryomov out: 3209c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3210f46b5a66SChristoph Hellwig return ret; 3211f46b5a66SChristoph Hellwig } 3212f46b5a66SChristoph Hellwig 32136b526ed7SAnand Jain static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) 3214f46b5a66SChristoph Hellwig { 32150b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 32176b526ed7SAnand Jain struct btrfs_ioctl_vol_args_v2 *vol_args; 3218f46b5a66SChristoph Hellwig int ret; 3219f46b5a66SChristoph Hellwig 3220e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 3221e441d54dSChris Mason return -EPERM; 3222e441d54dSChris Mason 3223da24927bSMiao Xie ret = mnt_want_write_file(file); 3224da24927bSMiao Xie if (ret) 3225da24927bSMiao Xie return ret; 3226c146afadSYan Zheng 3227dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 3228c9e9f97bSIlya Dryomov if (IS_ERR(vol_args)) { 3229c9e9f97bSIlya Dryomov ret = PTR_ERR(vol_args); 3230c47ca32dSDan Carpenter goto err_drop; 3231c9e9f97bSIlya Dryomov } 3232f46b5a66SChristoph Hellwig 3233748449cdSDavid Sterba if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { 3234fd4e994bSOmar Sandoval ret = -EOPNOTSUPP; 3235fd4e994bSOmar Sandoval goto out; 3236fd4e994bSOmar Sandoval } 3237f46b5a66SChristoph Hellwig 3238c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3239183860f6SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 3240183860f6SAnand Jain goto out; 3241183860f6SAnand Jain } 3242183860f6SAnand Jain 3243735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { 32442ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, NULL, vol_args->devid); 32456b526ed7SAnand Jain } else { 32466b526ed7SAnand Jain vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 32472ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 32486b526ed7SAnand Jain } 3249c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 3250183860f6SAnand Jain 32516b526ed7SAnand Jain if (!ret) { 3252735654eaSDavid Sterba if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) 32530b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: id %llu", 32546b526ed7SAnand Jain vol_args->devid); 32556b526ed7SAnand Jain else 32560b246afaSJeff Mahoney btrfs_info(fs_info, "device deleted: %s", 32576b526ed7SAnand Jain vol_args->name); 32586b526ed7SAnand Jain } 3259183860f6SAnand Jain out: 3260183860f6SAnand Jain kfree(vol_args); 3261c47ca32dSDan Carpenter err_drop: 32624ac20c70SIlya Dryomov mnt_drop_write_file(file); 3263f46b5a66SChristoph Hellwig return ret; 3264f46b5a66SChristoph Hellwig } 3265f46b5a66SChristoph Hellwig 3266f46b5a66SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) 3267f46b5a66SChristoph Hellwig { 32680b246afaSJeff Mahoney struct inode *inode = file_inode(file); 32690b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 3270f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 3271f46b5a66SChristoph Hellwig int ret; 3272f46b5a66SChristoph Hellwig 3273f46b5a66SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 3274f46b5a66SChristoph Hellwig return -EPERM; 3275f46b5a66SChristoph Hellwig 3276f46b5a66SChristoph Hellwig ret = mnt_want_write_file(file); 3277f46b5a66SChristoph Hellwig if (ret) 3278f46b5a66SChristoph Hellwig return ret; 3279f46b5a66SChristoph Hellwig 3280c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REMOVE)) { 3281f46b5a66SChristoph Hellwig ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 328258d7bbf8SDavid Sterba goto out_drop_write; 328358d7bbf8SDavid Sterba } 328458d7bbf8SDavid Sterba 328558d7bbf8SDavid Sterba vol_args = memdup_user(arg, sizeof(*vol_args)); 328658d7bbf8SDavid Sterba if (IS_ERR(vol_args)) { 328758d7bbf8SDavid Sterba ret = PTR_ERR(vol_args); 3288f46b5a66SChristoph Hellwig goto out; 3289f46b5a66SChristoph Hellwig } 3290f46b5a66SChristoph Hellwig 329158d7bbf8SDavid Sterba vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 32922ff7e61eSJeff Mahoney ret = btrfs_rm_device(fs_info, vol_args->name, 0); 3293f46b5a66SChristoph Hellwig 3294f46b5a66SChristoph Hellwig if (!ret) 32950b246afaSJeff Mahoney btrfs_info(fs_info, "disk deleted %s", vol_args->name); 3296f46b5a66SChristoph Hellwig kfree(vol_args); 329758d7bbf8SDavid Sterba out: 3298c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 329958d7bbf8SDavid Sterba out_drop_write: 3300f46b5a66SChristoph Hellwig mnt_drop_write_file(file); 330158d7bbf8SDavid Sterba 3302f46b5a66SChristoph Hellwig return ret; 3303f46b5a66SChristoph Hellwig } 3304f46b5a66SChristoph Hellwig 33052ff7e61eSJeff Mahoney static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, 33062ff7e61eSJeff Mahoney void __user *arg) 3307475f6387SJan Schmidt { 3308027ed2f0SLi Zefan struct btrfs_ioctl_fs_info_args *fi_args; 3309475f6387SJan Schmidt struct btrfs_device *device; 33100b246afaSJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 3311137c5418SJohannes Thumshirn u64 flags_in; 3312027ed2f0SLi Zefan int ret = 0; 3313475f6387SJan Schmidt 3314137c5418SJohannes Thumshirn fi_args = memdup_user(arg, sizeof(*fi_args)); 3315137c5418SJohannes Thumshirn if (IS_ERR(fi_args)) 3316137c5418SJohannes Thumshirn return PTR_ERR(fi_args); 3317137c5418SJohannes Thumshirn 3318137c5418SJohannes Thumshirn flags_in = fi_args->flags; 3319137c5418SJohannes Thumshirn memset(fi_args, 0, sizeof(*fi_args)); 3320027ed2f0SLi Zefan 3321d03262c7SDavid Sterba rcu_read_lock(); 3322027ed2f0SLi Zefan fi_args->num_devices = fs_devices->num_devices; 3323475f6387SJan Schmidt 3324d03262c7SDavid Sterba list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 3325027ed2f0SLi Zefan if (device->devid > fi_args->max_id) 3326027ed2f0SLi Zefan fi_args->max_id = device->devid; 3327475f6387SJan Schmidt } 3328d03262c7SDavid Sterba rcu_read_unlock(); 3329475f6387SJan Schmidt 3330de37aa51SNikolay Borisov memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); 3331bea7eafdSOmar Sandoval fi_args->nodesize = fs_info->nodesize; 3332bea7eafdSOmar Sandoval fi_args->sectorsize = fs_info->sectorsize; 3333bea7eafdSOmar Sandoval fi_args->clone_alignment = fs_info->sectorsize; 333480a773fbSDavid Sterba 3335137c5418SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { 3336137c5418SJohannes Thumshirn fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); 3337137c5418SJohannes Thumshirn fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); 3338137c5418SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; 3339137c5418SJohannes Thumshirn } 3340137c5418SJohannes Thumshirn 33410fb408a5SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { 33420fb408a5SJohannes Thumshirn fi_args->generation = fs_info->generation; 33430fb408a5SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; 33440fb408a5SJohannes Thumshirn } 33450fb408a5SJohannes Thumshirn 334649bac897SJohannes Thumshirn if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { 334749bac897SJohannes Thumshirn memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, 334849bac897SJohannes Thumshirn sizeof(fi_args->metadata_uuid)); 334949bac897SJohannes Thumshirn fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; 335049bac897SJohannes Thumshirn } 335149bac897SJohannes Thumshirn 3352027ed2f0SLi Zefan if (copy_to_user(arg, fi_args, sizeof(*fi_args))) 3353027ed2f0SLi Zefan ret = -EFAULT; 3354475f6387SJan Schmidt 3355027ed2f0SLi Zefan kfree(fi_args); 3356027ed2f0SLi Zefan return ret; 3357475f6387SJan Schmidt } 3358475f6387SJan Schmidt 33592ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, 33602ff7e61eSJeff Mahoney void __user *arg) 3361475f6387SJan Schmidt { 3362475f6387SJan Schmidt struct btrfs_ioctl_dev_info_args *di_args; 3363475f6387SJan Schmidt struct btrfs_device *dev; 3364475f6387SJan Schmidt int ret = 0; 3365475f6387SJan Schmidt char *s_uuid = NULL; 3366475f6387SJan Schmidt 3367475f6387SJan Schmidt di_args = memdup_user(arg, sizeof(*di_args)); 3368475f6387SJan Schmidt if (IS_ERR(di_args)) 3369475f6387SJan Schmidt return PTR_ERR(di_args); 3370475f6387SJan Schmidt 3371dd5f9615SStefan Behrens if (!btrfs_is_empty_uuid(di_args->uuid)) 3372475f6387SJan Schmidt s_uuid = di_args->uuid; 3373475f6387SJan Schmidt 3374c5593ca3SDavid Sterba rcu_read_lock(); 3375e4319cd9SAnand Jain dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid, 3376b2598edfSAnand Jain NULL); 3377475f6387SJan Schmidt 3378475f6387SJan Schmidt if (!dev) { 3379475f6387SJan Schmidt ret = -ENODEV; 3380475f6387SJan Schmidt goto out; 3381475f6387SJan Schmidt } 3382475f6387SJan Schmidt 3383475f6387SJan Schmidt di_args->devid = dev->devid; 33847cc8e58dSMiao Xie di_args->bytes_used = btrfs_device_get_bytes_used(dev); 33857cc8e58dSMiao Xie di_args->total_bytes = btrfs_device_get_total_bytes(dev); 3386475f6387SJan Schmidt memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); 3387a27202fbSJim Meyering if (dev->name) { 3388672d5990SMisono Tomohiro strncpy(di_args->path, rcu_str_deref(dev->name), 3389672d5990SMisono Tomohiro sizeof(di_args->path) - 1); 3390a27202fbSJim Meyering di_args->path[sizeof(di_args->path) - 1] = 0; 3391a27202fbSJim Meyering } else { 339299ba55adSStefan Behrens di_args->path[0] = '\0'; 3393a27202fbSJim Meyering } 3394475f6387SJan Schmidt 3395475f6387SJan Schmidt out: 3396c5593ca3SDavid Sterba rcu_read_unlock(); 3397475f6387SJan Schmidt if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) 3398475f6387SJan Schmidt ret = -EFAULT; 3399475f6387SJan Schmidt 3400475f6387SJan Schmidt kfree(di_args); 3401475f6387SJan Schmidt return ret; 3402475f6387SJan Schmidt } 3403475f6387SJan Schmidt 34046ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 34056ef5ed0dSJosef Bacik { 3406496ad9aaSAl Viro struct inode *inode = file_inode(file); 34070b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 34086ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 34096ef5ed0dSJosef Bacik struct btrfs_root *new_root; 34106ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 34116ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 34122a2b5d62SJosef Bacik struct btrfs_path *path = NULL; 34136ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 34146ef5ed0dSJosef Bacik u64 objectid = 0; 34156ef5ed0dSJosef Bacik u64 dir_id; 34163c04ce01SMiao Xie int ret; 34176ef5ed0dSJosef Bacik 34186ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 34196ef5ed0dSJosef Bacik return -EPERM; 34206ef5ed0dSJosef Bacik 34213c04ce01SMiao Xie ret = mnt_want_write_file(file); 34223c04ce01SMiao Xie if (ret) 34233c04ce01SMiao Xie return ret; 34243c04ce01SMiao Xie 34253c04ce01SMiao Xie if (copy_from_user(&objectid, argp, sizeof(objectid))) { 34263c04ce01SMiao Xie ret = -EFAULT; 34273c04ce01SMiao Xie goto out; 34283c04ce01SMiao Xie } 34296ef5ed0dSJosef Bacik 34306ef5ed0dSJosef Bacik if (!objectid) 34311cecf579Schandan objectid = BTRFS_FS_TREE_OBJECTID; 34326ef5ed0dSJosef Bacik 343356e9357aSDavid Sterba new_root = btrfs_get_fs_root(fs_info, objectid, true); 34343c04ce01SMiao Xie if (IS_ERR(new_root)) { 34353c04ce01SMiao Xie ret = PTR_ERR(new_root); 34363c04ce01SMiao Xie goto out; 34373c04ce01SMiao Xie } 34382a2b5d62SJosef Bacik if (!is_fstree(new_root->root_key.objectid)) { 34392a2b5d62SJosef Bacik ret = -ENOENT; 34402a2b5d62SJosef Bacik goto out_free; 34412a2b5d62SJosef Bacik } 34426ef5ed0dSJosef Bacik 34436ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 34443c04ce01SMiao Xie if (!path) { 34453c04ce01SMiao Xie ret = -ENOMEM; 34462a2b5d62SJosef Bacik goto out_free; 34473c04ce01SMiao Xie } 34486ef5ed0dSJosef Bacik 34496ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 345098d5dc13STsutomu Itoh if (IS_ERR(trans)) { 34513c04ce01SMiao Xie ret = PTR_ERR(trans); 34522a2b5d62SJosef Bacik goto out_free; 34536ef5ed0dSJosef Bacik } 34546ef5ed0dSJosef Bacik 34550b246afaSJeff Mahoney dir_id = btrfs_super_root_dir(fs_info->super_copy); 34560b246afaSJeff Mahoney di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, 34576ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 3458cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 34592a2b5d62SJosef Bacik btrfs_release_path(path); 34603a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34610b246afaSJeff Mahoney btrfs_err(fs_info, 34625d163e0eSJeff Mahoney "Umm, you don't have the default diritem, this isn't going to work"); 34633c04ce01SMiao Xie ret = -ENOENT; 34642a2b5d62SJosef Bacik goto out_free; 34656ef5ed0dSJosef Bacik } 34666ef5ed0dSJosef Bacik 34676ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 34686ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 34696ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 34702a2b5d62SJosef Bacik btrfs_release_path(path); 34716ef5ed0dSJosef Bacik 34720b246afaSJeff Mahoney btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); 34733a45bb20SJeff Mahoney btrfs_end_transaction(trans); 34742a2b5d62SJosef Bacik out_free: 347500246528SJosef Bacik btrfs_put_root(new_root); 34762a2b5d62SJosef Bacik btrfs_free_path(path); 34773c04ce01SMiao Xie out: 34783c04ce01SMiao Xie mnt_drop_write_file(file); 34793c04ce01SMiao Xie return ret; 34806ef5ed0dSJosef Bacik } 34816ef5ed0dSJosef Bacik 3482c065f5b1SSu Yue static void get_block_group_info(struct list_head *groups_list, 3483bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 3484bf5fc093SJosef Bacik { 348532da5386SDavid Sterba struct btrfs_block_group *block_group; 3486bf5fc093SJosef Bacik 3487bf5fc093SJosef Bacik space->total_bytes = 0; 3488bf5fc093SJosef Bacik space->used_bytes = 0; 3489bf5fc093SJosef Bacik space->flags = 0; 3490bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 3491bf5fc093SJosef Bacik space->flags = block_group->flags; 3492b3470b5dSDavid Sterba space->total_bytes += block_group->length; 3493bf38be65SDavid Sterba space->used_bytes += block_group->used; 3494bf5fc093SJosef Bacik } 3495bf5fc093SJosef Bacik } 3496bf5fc093SJosef Bacik 34972ff7e61eSJeff Mahoney static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, 34982ff7e61eSJeff Mahoney void __user *arg) 34991406e432SJosef Bacik { 35001406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 35011406e432SJosef Bacik struct btrfs_ioctl_space_info space; 35021406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 35037fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 350413f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 35051406e432SJosef Bacik struct btrfs_space_info *info; 3506315d8e98SColin Ian King static const u64 types[] = { 3507315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA, 3508bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 3509bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 3510315d8e98SColin Ian King BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA 3511315d8e98SColin Ian King }; 3512bf5fc093SJosef Bacik int num_types = 4; 35137fde62bfSChris Mason int alloc_size; 35141406e432SJosef Bacik int ret = 0; 351551788b1bSDan Rosenberg u64 slot_count = 0; 3516bf5fc093SJosef Bacik int i, c; 35171406e432SJosef Bacik 35181406e432SJosef Bacik if (copy_from_user(&space_args, 35191406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 35201406e432SJosef Bacik sizeof(space_args))) 35211406e432SJosef Bacik return -EFAULT; 35221406e432SJosef Bacik 3523bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3524bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3525bf5fc093SJosef Bacik 3526bf5fc093SJosef Bacik info = NULL; 352772804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3528bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3529bf5fc093SJosef Bacik info = tmp; 3530bf5fc093SJosef Bacik break; 3531bf5fc093SJosef Bacik } 3532bf5fc093SJosef Bacik } 35331406e432SJosef Bacik 3534bf5fc093SJosef Bacik if (!info) 3535bf5fc093SJosef Bacik continue; 3536bf5fc093SJosef Bacik 3537bf5fc093SJosef Bacik down_read(&info->groups_sem); 3538bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3539bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 3540bf5fc093SJosef Bacik slot_count++; 3541bf5fc093SJosef Bacik } 3542bf5fc093SJosef Bacik up_read(&info->groups_sem); 3543bf5fc093SJosef Bacik } 3544bf5fc093SJosef Bacik 354536523e95SDavid Sterba /* 354636523e95SDavid Sterba * Global block reserve, exported as a space_info 354736523e95SDavid Sterba */ 354836523e95SDavid Sterba slot_count++; 354936523e95SDavid Sterba 35507fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 35517fde62bfSChris Mason if (space_args.space_slots == 0) { 35527fde62bfSChris Mason space_args.total_spaces = slot_count; 35537fde62bfSChris Mason goto out; 35547fde62bfSChris Mason } 3555bf5fc093SJosef Bacik 355651788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 3557bf5fc093SJosef Bacik 35587fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 3559bf5fc093SJosef Bacik 35607fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 35617fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 35627fde62bfSChris Mason */ 356309cbfeafSKirill A. Shutemov if (alloc_size > PAGE_SIZE) 35647fde62bfSChris Mason return -ENOMEM; 35657fde62bfSChris Mason 35667fde62bfSChris Mason space_args.total_spaces = 0; 35678d2db785SDavid Sterba dest = kmalloc(alloc_size, GFP_KERNEL); 35687fde62bfSChris Mason if (!dest) 35697fde62bfSChris Mason return -ENOMEM; 35707fde62bfSChris Mason dest_orig = dest; 35717fde62bfSChris Mason 35727fde62bfSChris Mason /* now we have a buffer to copy into */ 3573bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 3574bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 3575bf5fc093SJosef Bacik 357651788b1bSDan Rosenberg if (!slot_count) 357751788b1bSDan Rosenberg break; 357851788b1bSDan Rosenberg 3579bf5fc093SJosef Bacik info = NULL; 358072804905SJosef Bacik list_for_each_entry(tmp, &fs_info->space_info, list) { 3581bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 3582bf5fc093SJosef Bacik info = tmp; 35837fde62bfSChris Mason break; 3584bf5fc093SJosef Bacik } 3585bf5fc093SJosef Bacik } 35867fde62bfSChris Mason 3587bf5fc093SJosef Bacik if (!info) 3588bf5fc093SJosef Bacik continue; 3589bf5fc093SJosef Bacik down_read(&info->groups_sem); 3590bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 3591bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 3592c065f5b1SSu Yue get_block_group_info(&info->block_groups[c], 3593c065f5b1SSu Yue &space); 35947fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 35951406e432SJosef Bacik dest++; 35961406e432SJosef Bacik space_args.total_spaces++; 359751788b1bSDan Rosenberg slot_count--; 35981406e432SJosef Bacik } 359951788b1bSDan Rosenberg if (!slot_count) 360051788b1bSDan Rosenberg break; 3601bf5fc093SJosef Bacik } 3602bf5fc093SJosef Bacik up_read(&info->groups_sem); 3603bf5fc093SJosef Bacik } 36041406e432SJosef Bacik 360536523e95SDavid Sterba /* 360636523e95SDavid Sterba * Add global block reserve 360736523e95SDavid Sterba */ 360836523e95SDavid Sterba if (slot_count) { 36090b246afaSJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 361036523e95SDavid Sterba 361136523e95SDavid Sterba spin_lock(&block_rsv->lock); 361236523e95SDavid Sterba space.total_bytes = block_rsv->size; 361336523e95SDavid Sterba space.used_bytes = block_rsv->size - block_rsv->reserved; 361436523e95SDavid Sterba spin_unlock(&block_rsv->lock); 361536523e95SDavid Sterba space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; 361636523e95SDavid Sterba memcpy(dest, &space, sizeof(space)); 361736523e95SDavid Sterba space_args.total_spaces++; 361836523e95SDavid Sterba } 361936523e95SDavid Sterba 36202eec6c81SDaniel J Blueman user_dest = (struct btrfs_ioctl_space_info __user *) 36217fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 36227fde62bfSChris Mason 36237fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 36247fde62bfSChris Mason ret = -EFAULT; 36257fde62bfSChris Mason 36267fde62bfSChris Mason kfree(dest_orig); 36277fde62bfSChris Mason out: 36287fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 36291406e432SJosef Bacik ret = -EFAULT; 36301406e432SJosef Bacik 36311406e432SJosef Bacik return ret; 36321406e432SJosef Bacik } 36331406e432SJosef Bacik 36349a8c28beSMiao Xie static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, 36359a8c28beSMiao Xie void __user *argp) 363646204592SSage Weil { 363746204592SSage Weil struct btrfs_trans_handle *trans; 363846204592SSage Weil u64 transid; 3639db5b493aSTsutomu Itoh int ret; 364046204592SSage Weil 3641d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 3642ff7c1d33SMiao Xie if (IS_ERR(trans)) { 3643ff7c1d33SMiao Xie if (PTR_ERR(trans) != -ENOENT) 364498d5dc13STsutomu Itoh return PTR_ERR(trans); 3645ff7c1d33SMiao Xie 3646ff7c1d33SMiao Xie /* No running transaction, don't bother */ 3647ff7c1d33SMiao Xie transid = root->fs_info->last_trans_committed; 3648ff7c1d33SMiao Xie goto out; 3649ff7c1d33SMiao Xie } 365046204592SSage Weil transid = trans->transid; 36513a45bb20SJeff Mahoney ret = btrfs_commit_transaction_async(trans, 0); 36528b2b2d3cSTsutomu Itoh if (ret) { 36533a45bb20SJeff Mahoney btrfs_end_transaction(trans); 3654db5b493aSTsutomu Itoh return ret; 36558b2b2d3cSTsutomu Itoh } 3656ff7c1d33SMiao Xie out: 365746204592SSage Weil if (argp) 365846204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 365946204592SSage Weil return -EFAULT; 366046204592SSage Weil return 0; 366146204592SSage Weil } 366246204592SSage Weil 36632ff7e61eSJeff Mahoney static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, 36649a8c28beSMiao Xie void __user *argp) 366546204592SSage Weil { 366646204592SSage Weil u64 transid; 366746204592SSage Weil 366846204592SSage Weil if (argp) { 366946204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 367046204592SSage Weil return -EFAULT; 367146204592SSage Weil } else { 367246204592SSage Weil transid = 0; /* current trans */ 367346204592SSage Weil } 36742ff7e61eSJeff Mahoney return btrfs_wait_for_commit(fs_info, transid); 367546204592SSage Weil } 367646204592SSage Weil 3677b8e95489SMiao Xie static long btrfs_ioctl_scrub(struct file *file, void __user *arg) 3678475f6387SJan Schmidt { 36790b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); 3680475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3681b8e95489SMiao Xie int ret; 3682475f6387SJan Schmidt 3683475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3684475f6387SJan Schmidt return -EPERM; 3685475f6387SJan Schmidt 3686475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3687475f6387SJan Schmidt if (IS_ERR(sa)) 3688475f6387SJan Schmidt return PTR_ERR(sa); 3689475f6387SJan Schmidt 3690b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) { 3691b8e95489SMiao Xie ret = mnt_want_write_file(file); 3692b8e95489SMiao Xie if (ret) 3693b8e95489SMiao Xie goto out; 3694b8e95489SMiao Xie } 3695b8e95489SMiao Xie 36960b246afaSJeff Mahoney ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, 369763a212abSStefan Behrens &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, 369863a212abSStefan Behrens 0); 3699475f6387SJan Schmidt 37005afe6ce7SFilipe Manana /* 37015afe6ce7SFilipe Manana * Copy scrub args to user space even if btrfs_scrub_dev() returned an 37025afe6ce7SFilipe Manana * error. This is important as it allows user space to know how much 37035afe6ce7SFilipe Manana * progress scrub has done. For example, if scrub is canceled we get 37045afe6ce7SFilipe Manana * -ECANCELED from btrfs_scrub_dev() and return that error back to user 37055afe6ce7SFilipe Manana * space. Later user space can inspect the progress from the structure 37065afe6ce7SFilipe Manana * btrfs_ioctl_scrub_args and resume scrub from where it left off 37075afe6ce7SFilipe Manana * previously (btrfs-progs does this). 37085afe6ce7SFilipe Manana * If we fail to copy the btrfs_ioctl_scrub_args structure to user space 37095afe6ce7SFilipe Manana * then return -EFAULT to signal the structure was not copied or it may 37105afe6ce7SFilipe Manana * be corrupt and unreliable due to a partial copy. 37115afe6ce7SFilipe Manana */ 37125afe6ce7SFilipe Manana if (copy_to_user(arg, sa, sizeof(*sa))) 3713475f6387SJan Schmidt ret = -EFAULT; 3714475f6387SJan Schmidt 3715b8e95489SMiao Xie if (!(sa->flags & BTRFS_SCRUB_READONLY)) 3716b8e95489SMiao Xie mnt_drop_write_file(file); 3717b8e95489SMiao Xie out: 3718475f6387SJan Schmidt kfree(sa); 3719475f6387SJan Schmidt return ret; 3720475f6387SJan Schmidt } 3721475f6387SJan Schmidt 37222ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) 3723475f6387SJan Schmidt { 3724475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3725475f6387SJan Schmidt return -EPERM; 3726475f6387SJan Schmidt 37272ff7e61eSJeff Mahoney return btrfs_scrub_cancel(fs_info); 3728475f6387SJan Schmidt } 3729475f6387SJan Schmidt 37302ff7e61eSJeff Mahoney static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, 3731475f6387SJan Schmidt void __user *arg) 3732475f6387SJan Schmidt { 3733475f6387SJan Schmidt struct btrfs_ioctl_scrub_args *sa; 3734475f6387SJan Schmidt int ret; 3735475f6387SJan Schmidt 3736475f6387SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3737475f6387SJan Schmidt return -EPERM; 3738475f6387SJan Schmidt 3739475f6387SJan Schmidt sa = memdup_user(arg, sizeof(*sa)); 3740475f6387SJan Schmidt if (IS_ERR(sa)) 3741475f6387SJan Schmidt return PTR_ERR(sa); 3742475f6387SJan Schmidt 37432ff7e61eSJeff Mahoney ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); 3744475f6387SJan Schmidt 37454fa99b00SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3746475f6387SJan Schmidt ret = -EFAULT; 3747475f6387SJan Schmidt 3748475f6387SJan Schmidt kfree(sa); 3749475f6387SJan Schmidt return ret; 3750475f6387SJan Schmidt } 3751475f6387SJan Schmidt 37522ff7e61eSJeff Mahoney static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, 3753b27f7c0cSDavid Sterba void __user *arg) 3754c11d2c23SStefan Behrens { 3755c11d2c23SStefan Behrens struct btrfs_ioctl_get_dev_stats *sa; 3756c11d2c23SStefan Behrens int ret; 3757c11d2c23SStefan Behrens 3758c11d2c23SStefan Behrens sa = memdup_user(arg, sizeof(*sa)); 3759c11d2c23SStefan Behrens if (IS_ERR(sa)) 3760c11d2c23SStefan Behrens return PTR_ERR(sa); 3761c11d2c23SStefan Behrens 3762b27f7c0cSDavid Sterba if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { 3763b27f7c0cSDavid Sterba kfree(sa); 3764b27f7c0cSDavid Sterba return -EPERM; 3765b27f7c0cSDavid Sterba } 3766b27f7c0cSDavid Sterba 37672ff7e61eSJeff Mahoney ret = btrfs_get_dev_stats(fs_info, sa); 3768c11d2c23SStefan Behrens 3769eee99577SFilipe Manana if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) 3770c11d2c23SStefan Behrens ret = -EFAULT; 3771c11d2c23SStefan Behrens 3772c11d2c23SStefan Behrens kfree(sa); 3773c11d2c23SStefan Behrens return ret; 3774c11d2c23SStefan Behrens } 3775c11d2c23SStefan Behrens 37762ff7e61eSJeff Mahoney static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, 37772ff7e61eSJeff Mahoney void __user *arg) 37783f6bcfbdSStefan Behrens { 37793f6bcfbdSStefan Behrens struct btrfs_ioctl_dev_replace_args *p; 37803f6bcfbdSStefan Behrens int ret; 37813f6bcfbdSStefan Behrens 37823f6bcfbdSStefan Behrens if (!capable(CAP_SYS_ADMIN)) 37833f6bcfbdSStefan Behrens return -EPERM; 37843f6bcfbdSStefan Behrens 37853f6bcfbdSStefan Behrens p = memdup_user(arg, sizeof(*p)); 37863f6bcfbdSStefan Behrens if (IS_ERR(p)) 37873f6bcfbdSStefan Behrens return PTR_ERR(p); 37883f6bcfbdSStefan Behrens 37893f6bcfbdSStefan Behrens switch (p->cmd) { 37903f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_START: 3791bc98a42cSDavid Howells if (sb_rdonly(fs_info->sb)) { 3792adfa97cbSIlya Dryomov ret = -EROFS; 3793adfa97cbSIlya Dryomov goto out; 3794adfa97cbSIlya Dryomov } 3795c3e1f96cSGoldwyn Rodrigues if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { 3796e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 37973f6bcfbdSStefan Behrens } else { 37982ff7e61eSJeff Mahoney ret = btrfs_dev_replace_by_ioctl(fs_info, p); 3799c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 38003f6bcfbdSStefan Behrens } 38013f6bcfbdSStefan Behrens break; 38023f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: 38030b246afaSJeff Mahoney btrfs_dev_replace_status(fs_info, p); 38043f6bcfbdSStefan Behrens ret = 0; 38053f6bcfbdSStefan Behrens break; 38063f6bcfbdSStefan Behrens case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: 380717d202b9SAnand Jain p->result = btrfs_dev_replace_cancel(fs_info); 380897282031SAnand Jain ret = 0; 38093f6bcfbdSStefan Behrens break; 38103f6bcfbdSStefan Behrens default: 38113f6bcfbdSStefan Behrens ret = -EINVAL; 38123f6bcfbdSStefan Behrens break; 38133f6bcfbdSStefan Behrens } 38143f6bcfbdSStefan Behrens 3815d3a53286SFilipe Manana if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) 38163f6bcfbdSStefan Behrens ret = -EFAULT; 3817adfa97cbSIlya Dryomov out: 38183f6bcfbdSStefan Behrens kfree(p); 38193f6bcfbdSStefan Behrens return ret; 38203f6bcfbdSStefan Behrens } 38213f6bcfbdSStefan Behrens 3822d7728c96SJan Schmidt static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) 3823d7728c96SJan Schmidt { 3824d7728c96SJan Schmidt int ret = 0; 3825d7728c96SJan Schmidt int i; 3826740c3d22SChris Mason u64 rel_ptr; 3827d7728c96SJan Schmidt int size; 3828806468f8SChris Mason struct btrfs_ioctl_ino_path_args *ipa = NULL; 3829d7728c96SJan Schmidt struct inode_fs_paths *ipath = NULL; 3830d7728c96SJan Schmidt struct btrfs_path *path; 3831d7728c96SJan Schmidt 383282b22ac8SKusanagi Kouichi if (!capable(CAP_DAC_READ_SEARCH)) 3833d7728c96SJan Schmidt return -EPERM; 3834d7728c96SJan Schmidt 3835d7728c96SJan Schmidt path = btrfs_alloc_path(); 3836d7728c96SJan Schmidt if (!path) { 3837d7728c96SJan Schmidt ret = -ENOMEM; 3838d7728c96SJan Schmidt goto out; 3839d7728c96SJan Schmidt } 3840d7728c96SJan Schmidt 3841d7728c96SJan Schmidt ipa = memdup_user(arg, sizeof(*ipa)); 3842d7728c96SJan Schmidt if (IS_ERR(ipa)) { 3843d7728c96SJan Schmidt ret = PTR_ERR(ipa); 3844d7728c96SJan Schmidt ipa = NULL; 3845d7728c96SJan Schmidt goto out; 3846d7728c96SJan Schmidt } 3847d7728c96SJan Schmidt 3848d7728c96SJan Schmidt size = min_t(u32, ipa->size, 4096); 3849d7728c96SJan Schmidt ipath = init_ipath(size, root, path); 3850d7728c96SJan Schmidt if (IS_ERR(ipath)) { 3851d7728c96SJan Schmidt ret = PTR_ERR(ipath); 3852d7728c96SJan Schmidt ipath = NULL; 3853d7728c96SJan Schmidt goto out; 3854d7728c96SJan Schmidt } 3855d7728c96SJan Schmidt 3856d7728c96SJan Schmidt ret = paths_from_inode(ipa->inum, ipath); 3857d7728c96SJan Schmidt if (ret < 0) 3858d7728c96SJan Schmidt goto out; 3859d7728c96SJan Schmidt 3860d7728c96SJan Schmidt for (i = 0; i < ipath->fspath->elem_cnt; ++i) { 3861745c4d8eSJeff Mahoney rel_ptr = ipath->fspath->val[i] - 3862745c4d8eSJeff Mahoney (u64)(unsigned long)ipath->fspath->val; 3863740c3d22SChris Mason ipath->fspath->val[i] = rel_ptr; 3864d7728c96SJan Schmidt } 3865d7728c96SJan Schmidt 3866718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, 3867718dc5faSOmar Sandoval ipath->fspath, size); 3868d7728c96SJan Schmidt if (ret) { 3869d7728c96SJan Schmidt ret = -EFAULT; 3870d7728c96SJan Schmidt goto out; 3871d7728c96SJan Schmidt } 3872d7728c96SJan Schmidt 3873d7728c96SJan Schmidt out: 3874d7728c96SJan Schmidt btrfs_free_path(path); 3875d7728c96SJan Schmidt free_ipath(ipath); 3876d7728c96SJan Schmidt kfree(ipa); 3877d7728c96SJan Schmidt 3878d7728c96SJan Schmidt return ret; 3879d7728c96SJan Schmidt } 3880d7728c96SJan Schmidt 3881d7728c96SJan Schmidt static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) 3882d7728c96SJan Schmidt { 3883d7728c96SJan Schmidt struct btrfs_data_container *inodes = ctx; 3884d7728c96SJan Schmidt const size_t c = 3 * sizeof(u64); 3885d7728c96SJan Schmidt 3886d7728c96SJan Schmidt if (inodes->bytes_left >= c) { 3887d7728c96SJan Schmidt inodes->bytes_left -= c; 3888d7728c96SJan Schmidt inodes->val[inodes->elem_cnt] = inum; 3889d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 1] = offset; 3890d7728c96SJan Schmidt inodes->val[inodes->elem_cnt + 2] = root; 3891d7728c96SJan Schmidt inodes->elem_cnt += 3; 3892d7728c96SJan Schmidt } else { 3893d7728c96SJan Schmidt inodes->bytes_missing += c - inodes->bytes_left; 3894d7728c96SJan Schmidt inodes->bytes_left = 0; 3895d7728c96SJan Schmidt inodes->elem_missed += 3; 3896d7728c96SJan Schmidt } 3897d7728c96SJan Schmidt 3898d7728c96SJan Schmidt return 0; 3899d7728c96SJan Schmidt } 3900d7728c96SJan Schmidt 39012ff7e61eSJeff Mahoney static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, 3902d24a67b2SZygo Blaxell void __user *arg, int version) 3903d7728c96SJan Schmidt { 3904d7728c96SJan Schmidt int ret = 0; 3905d7728c96SJan Schmidt int size; 3906d7728c96SJan Schmidt struct btrfs_ioctl_logical_ino_args *loi; 3907d7728c96SJan Schmidt struct btrfs_data_container *inodes = NULL; 3908d7728c96SJan Schmidt struct btrfs_path *path = NULL; 3909d24a67b2SZygo Blaxell bool ignore_offset; 3910d7728c96SJan Schmidt 3911d7728c96SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 3912d7728c96SJan Schmidt return -EPERM; 3913d7728c96SJan Schmidt 3914d7728c96SJan Schmidt loi = memdup_user(arg, sizeof(*loi)); 39157b9ea627SShailendra Verma if (IS_ERR(loi)) 39167b9ea627SShailendra Verma return PTR_ERR(loi); 3917d7728c96SJan Schmidt 3918d24a67b2SZygo Blaxell if (version == 1) { 3919d24a67b2SZygo Blaxell ignore_offset = false; 3920b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_64K); 3921d24a67b2SZygo Blaxell } else { 3922d24a67b2SZygo Blaxell /* All reserved bits must be 0 for now */ 3923d24a67b2SZygo Blaxell if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { 3924d24a67b2SZygo Blaxell ret = -EINVAL; 3925d24a67b2SZygo Blaxell goto out_loi; 3926d24a67b2SZygo Blaxell } 3927d24a67b2SZygo Blaxell /* Only accept flags we have defined so far */ 3928d24a67b2SZygo Blaxell if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { 3929d24a67b2SZygo Blaxell ret = -EINVAL; 3930d24a67b2SZygo Blaxell goto out_loi; 3931d24a67b2SZygo Blaxell } 3932d24a67b2SZygo Blaxell ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; 3933b115e3bcSZygo Blaxell size = min_t(u32, loi->size, SZ_16M); 3934d24a67b2SZygo Blaxell } 3935d24a67b2SZygo Blaxell 3936d7728c96SJan Schmidt path = btrfs_alloc_path(); 3937d7728c96SJan Schmidt if (!path) { 3938d7728c96SJan Schmidt ret = -ENOMEM; 3939d7728c96SJan Schmidt goto out; 3940d7728c96SJan Schmidt } 3941d7728c96SJan Schmidt 3942d7728c96SJan Schmidt inodes = init_data_container(size); 3943d7728c96SJan Schmidt if (IS_ERR(inodes)) { 3944d7728c96SJan Schmidt ret = PTR_ERR(inodes); 3945d7728c96SJan Schmidt inodes = NULL; 3946d7728c96SJan Schmidt goto out; 3947d7728c96SJan Schmidt } 3948d7728c96SJan Schmidt 39492ff7e61eSJeff Mahoney ret = iterate_inodes_from_logical(loi->logical, fs_info, path, 3950d24a67b2SZygo Blaxell build_ino_list, inodes, ignore_offset); 3951df031f07SLiu Bo if (ret == -EINVAL) 3952d7728c96SJan Schmidt ret = -ENOENT; 3953d7728c96SJan Schmidt if (ret < 0) 3954d7728c96SJan Schmidt goto out; 3955d7728c96SJan Schmidt 3956718dc5faSOmar Sandoval ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, 3957718dc5faSOmar Sandoval size); 3958d7728c96SJan Schmidt if (ret) 3959d7728c96SJan Schmidt ret = -EFAULT; 3960d7728c96SJan Schmidt 3961d7728c96SJan Schmidt out: 3962d7728c96SJan Schmidt btrfs_free_path(path); 3963f54de068SDavid Sterba kvfree(inodes); 3964d24a67b2SZygo Blaxell out_loi: 3965d7728c96SJan Schmidt kfree(loi); 3966d7728c96SJan Schmidt 3967d7728c96SJan Schmidt return ret; 3968d7728c96SJan Schmidt } 3969d7728c96SJan Schmidt 3970008ef096SDavid Sterba void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 3971c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs) 3972c9e9f97bSIlya Dryomov { 3973c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl = fs_info->balance_ctl; 3974c9e9f97bSIlya Dryomov 3975c9e9f97bSIlya Dryomov bargs->flags = bctl->flags; 3976c9e9f97bSIlya Dryomov 39773009a62fSDavid Sterba if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) 3978837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_RUNNING; 3979837d5b6eSIlya Dryomov if (atomic_read(&fs_info->balance_pause_req)) 3980837d5b6eSIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; 3981a7e99c69SIlya Dryomov if (atomic_read(&fs_info->balance_cancel_req)) 3982a7e99c69SIlya Dryomov bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; 3983837d5b6eSIlya Dryomov 3984c9e9f97bSIlya Dryomov memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); 3985c9e9f97bSIlya Dryomov memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); 3986c9e9f97bSIlya Dryomov memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); 398719a39dceSIlya Dryomov 398819a39dceSIlya Dryomov spin_lock(&fs_info->balance_lock); 398919a39dceSIlya Dryomov memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); 399019a39dceSIlya Dryomov spin_unlock(&fs_info->balance_lock); 3991c9e9f97bSIlya Dryomov } 3992c9e9f97bSIlya Dryomov 39939ba1f6e4SLiu Bo static long btrfs_ioctl_balance(struct file *file, void __user *arg) 3994c9e9f97bSIlya Dryomov { 3995496ad9aaSAl Viro struct btrfs_root *root = BTRFS_I(file_inode(file))->root; 3996c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info = root->fs_info; 3997c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 3998c9e9f97bSIlya Dryomov struct btrfs_balance_control *bctl; 3999ed0fb78fSIlya Dryomov bool need_unlock; /* for mut. excl. ops lock */ 4000c9e9f97bSIlya Dryomov int ret; 4001c9e9f97bSIlya Dryomov 4002c9e9f97bSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4003c9e9f97bSIlya Dryomov return -EPERM; 4004c9e9f97bSIlya Dryomov 4005e54bfa31SLiu Bo ret = mnt_want_write_file(file); 40069ba1f6e4SLiu Bo if (ret) 40079ba1f6e4SLiu Bo return ret; 40089ba1f6e4SLiu Bo 4009ed0fb78fSIlya Dryomov again: 4010c3e1f96cSGoldwyn Rodrigues if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 4011c9e9f97bSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4012ed0fb78fSIlya Dryomov need_unlock = true; 4013ed0fb78fSIlya Dryomov goto locked; 4014ed0fb78fSIlya Dryomov } 4015ed0fb78fSIlya Dryomov 4016ed0fb78fSIlya Dryomov /* 401701327610SNicholas D Steeves * mut. excl. ops lock is locked. Three possibilities: 4018ed0fb78fSIlya Dryomov * (1) some other op is running 4019ed0fb78fSIlya Dryomov * (2) balance is running 4020ed0fb78fSIlya Dryomov * (3) balance is paused -- special case (think resume) 4021ed0fb78fSIlya Dryomov */ 4022ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4023ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4024ed0fb78fSIlya Dryomov /* this is either (2) or (3) */ 40253009a62fSDavid Sterba if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4026ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4027dccdb07bSDavid Sterba /* 4028dccdb07bSDavid Sterba * Lock released to allow other waiters to continue, 4029dccdb07bSDavid Sterba * we'll reexamine the status again. 4030dccdb07bSDavid Sterba */ 4031ed0fb78fSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 4032ed0fb78fSIlya Dryomov 4033ed0fb78fSIlya Dryomov if (fs_info->balance_ctl && 40343009a62fSDavid Sterba !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { 4035ed0fb78fSIlya Dryomov /* this is (3) */ 4036ed0fb78fSIlya Dryomov need_unlock = false; 4037ed0fb78fSIlya Dryomov goto locked; 4038ed0fb78fSIlya Dryomov } 4039ed0fb78fSIlya Dryomov 4040ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4041ed0fb78fSIlya Dryomov goto again; 4042ed0fb78fSIlya Dryomov } else { 4043ed0fb78fSIlya Dryomov /* this is (2) */ 4044ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4045ed0fb78fSIlya Dryomov ret = -EINPROGRESS; 4046ed0fb78fSIlya Dryomov goto out; 4047ed0fb78fSIlya Dryomov } 4048ed0fb78fSIlya Dryomov } else { 4049ed0fb78fSIlya Dryomov /* this is (1) */ 4050ed0fb78fSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4051e57138b3SAnand Jain ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; 4052ed0fb78fSIlya Dryomov goto out; 4053ed0fb78fSIlya Dryomov } 4054ed0fb78fSIlya Dryomov 4055ed0fb78fSIlya Dryomov locked: 4056c9e9f97bSIlya Dryomov 4057c9e9f97bSIlya Dryomov if (arg) { 4058c9e9f97bSIlya Dryomov bargs = memdup_user(arg, sizeof(*bargs)); 4059c9e9f97bSIlya Dryomov if (IS_ERR(bargs)) { 4060c9e9f97bSIlya Dryomov ret = PTR_ERR(bargs); 4061ed0fb78fSIlya Dryomov goto out_unlock; 4062c9e9f97bSIlya Dryomov } 4063de322263SIlya Dryomov 4064de322263SIlya Dryomov if (bargs->flags & BTRFS_BALANCE_RESUME) { 4065de322263SIlya Dryomov if (!fs_info->balance_ctl) { 4066de322263SIlya Dryomov ret = -ENOTCONN; 4067de322263SIlya Dryomov goto out_bargs; 4068de322263SIlya Dryomov } 4069de322263SIlya Dryomov 4070de322263SIlya Dryomov bctl = fs_info->balance_ctl; 4071de322263SIlya Dryomov spin_lock(&fs_info->balance_lock); 4072de322263SIlya Dryomov bctl->flags |= BTRFS_BALANCE_RESUME; 4073de322263SIlya Dryomov spin_unlock(&fs_info->balance_lock); 4074de322263SIlya Dryomov 4075de322263SIlya Dryomov goto do_balance; 4076de322263SIlya Dryomov } 4077c9e9f97bSIlya Dryomov } else { 4078c9e9f97bSIlya Dryomov bargs = NULL; 4079c9e9f97bSIlya Dryomov } 4080c9e9f97bSIlya Dryomov 4081ed0fb78fSIlya Dryomov if (fs_info->balance_ctl) { 4082837d5b6eSIlya Dryomov ret = -EINPROGRESS; 4083837d5b6eSIlya Dryomov goto out_bargs; 4084837d5b6eSIlya Dryomov } 4085837d5b6eSIlya Dryomov 40868d2db785SDavid Sterba bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); 4087c9e9f97bSIlya Dryomov if (!bctl) { 4088c9e9f97bSIlya Dryomov ret = -ENOMEM; 4089c9e9f97bSIlya Dryomov goto out_bargs; 4090c9e9f97bSIlya Dryomov } 4091c9e9f97bSIlya Dryomov 4092c9e9f97bSIlya Dryomov if (arg) { 4093c9e9f97bSIlya Dryomov memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); 4094c9e9f97bSIlya Dryomov memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); 4095c9e9f97bSIlya Dryomov memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); 4096c9e9f97bSIlya Dryomov 4097c9e9f97bSIlya Dryomov bctl->flags = bargs->flags; 4098f43ffb60SIlya Dryomov } else { 4099f43ffb60SIlya Dryomov /* balance everything - no filters */ 4100f43ffb60SIlya Dryomov bctl->flags |= BTRFS_BALANCE_TYPE_MASK; 4101c9e9f97bSIlya Dryomov } 4102c9e9f97bSIlya Dryomov 41038eb93459SDavid Sterba if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { 41048eb93459SDavid Sterba ret = -EINVAL; 41050f89abf5SChristian Engelmayer goto out_bctl; 41068eb93459SDavid Sterba } 41078eb93459SDavid Sterba 4108de322263SIlya Dryomov do_balance: 4109c9e9f97bSIlya Dryomov /* 4110c3e1f96cSGoldwyn Rodrigues * Ownership of bctl and exclusive operation goes to btrfs_balance. 4111c3e1f96cSGoldwyn Rodrigues * bctl is freed in reset_balance_state, or, if restriper was paused 4112c3e1f96cSGoldwyn Rodrigues * all the way until unmount, in free_fs_info. The flag should be 4113c3e1f96cSGoldwyn Rodrigues * cleared after reset_balance_state. 4114c9e9f97bSIlya Dryomov */ 4115ed0fb78fSIlya Dryomov need_unlock = false; 4116ed0fb78fSIlya Dryomov 41176fcf6e2bSDavid Sterba ret = btrfs_balance(fs_info, bctl, bargs); 41180f89abf5SChristian Engelmayer bctl = NULL; 4119ed0fb78fSIlya Dryomov 4120d00c2d9cSFilipe Manana if ((ret == 0 || ret == -ECANCELED) && arg) { 4121c9e9f97bSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 4122c9e9f97bSIlya Dryomov ret = -EFAULT; 4123c9e9f97bSIlya Dryomov } 4124c9e9f97bSIlya Dryomov 41250f89abf5SChristian Engelmayer out_bctl: 41260f89abf5SChristian Engelmayer kfree(bctl); 4127c9e9f97bSIlya Dryomov out_bargs: 4128c9e9f97bSIlya Dryomov kfree(bargs); 4129ed0fb78fSIlya Dryomov out_unlock: 4130c9e9f97bSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 4131ed0fb78fSIlya Dryomov if (need_unlock) 4132c3e1f96cSGoldwyn Rodrigues btrfs_exclop_finish(fs_info); 4133ed0fb78fSIlya Dryomov out: 4134e54bfa31SLiu Bo mnt_drop_write_file(file); 4135c9e9f97bSIlya Dryomov return ret; 4136c9e9f97bSIlya Dryomov } 4137c9e9f97bSIlya Dryomov 41382ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) 4139837d5b6eSIlya Dryomov { 4140837d5b6eSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 4141837d5b6eSIlya Dryomov return -EPERM; 4142837d5b6eSIlya Dryomov 4143837d5b6eSIlya Dryomov switch (cmd) { 4144837d5b6eSIlya Dryomov case BTRFS_BALANCE_CTL_PAUSE: 41450b246afaSJeff Mahoney return btrfs_pause_balance(fs_info); 4146a7e99c69SIlya Dryomov case BTRFS_BALANCE_CTL_CANCEL: 41470b246afaSJeff Mahoney return btrfs_cancel_balance(fs_info); 4148837d5b6eSIlya Dryomov } 4149837d5b6eSIlya Dryomov 4150837d5b6eSIlya Dryomov return -EINVAL; 4151837d5b6eSIlya Dryomov } 4152837d5b6eSIlya Dryomov 41532ff7e61eSJeff Mahoney static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, 415419a39dceSIlya Dryomov void __user *arg) 415519a39dceSIlya Dryomov { 415619a39dceSIlya Dryomov struct btrfs_ioctl_balance_args *bargs; 415719a39dceSIlya Dryomov int ret = 0; 415819a39dceSIlya Dryomov 415919a39dceSIlya Dryomov if (!capable(CAP_SYS_ADMIN)) 416019a39dceSIlya Dryomov return -EPERM; 416119a39dceSIlya Dryomov 416219a39dceSIlya Dryomov mutex_lock(&fs_info->balance_mutex); 416319a39dceSIlya Dryomov if (!fs_info->balance_ctl) { 416419a39dceSIlya Dryomov ret = -ENOTCONN; 416519a39dceSIlya Dryomov goto out; 416619a39dceSIlya Dryomov } 416719a39dceSIlya Dryomov 41688d2db785SDavid Sterba bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); 416919a39dceSIlya Dryomov if (!bargs) { 417019a39dceSIlya Dryomov ret = -ENOMEM; 417119a39dceSIlya Dryomov goto out; 417219a39dceSIlya Dryomov } 417319a39dceSIlya Dryomov 4174008ef096SDavid Sterba btrfs_update_ioctl_balance_args(fs_info, bargs); 417519a39dceSIlya Dryomov 417619a39dceSIlya Dryomov if (copy_to_user(arg, bargs, sizeof(*bargs))) 417719a39dceSIlya Dryomov ret = -EFAULT; 417819a39dceSIlya Dryomov 417919a39dceSIlya Dryomov kfree(bargs); 418019a39dceSIlya Dryomov out: 418119a39dceSIlya Dryomov mutex_unlock(&fs_info->balance_mutex); 418219a39dceSIlya Dryomov return ret; 418319a39dceSIlya Dryomov } 418419a39dceSIlya Dryomov 4185905b0ddaSMiao Xie static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) 41865d13a37bSArne Jansen { 41870b246afaSJeff Mahoney struct inode *inode = file_inode(file); 41880b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 41895d13a37bSArne Jansen struct btrfs_ioctl_quota_ctl_args *sa; 41905d13a37bSArne Jansen int ret; 41915d13a37bSArne Jansen 41925d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 41935d13a37bSArne Jansen return -EPERM; 41945d13a37bSArne Jansen 4195905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4196905b0ddaSMiao Xie if (ret) 4197905b0ddaSMiao Xie return ret; 41985d13a37bSArne Jansen 41995d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4200905b0ddaSMiao Xie if (IS_ERR(sa)) { 4201905b0ddaSMiao Xie ret = PTR_ERR(sa); 4202905b0ddaSMiao Xie goto drop_write; 4203905b0ddaSMiao Xie } 42045d13a37bSArne Jansen 42050b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 42065d13a37bSArne Jansen 42075d13a37bSArne Jansen switch (sa->cmd) { 42085d13a37bSArne Jansen case BTRFS_QUOTA_CTL_ENABLE: 4209340f1aa2SNikolay Borisov ret = btrfs_quota_enable(fs_info); 42105d13a37bSArne Jansen break; 42115d13a37bSArne Jansen case BTRFS_QUOTA_CTL_DISABLE: 4212340f1aa2SNikolay Borisov ret = btrfs_quota_disable(fs_info); 42135d13a37bSArne Jansen break; 42145d13a37bSArne Jansen default: 42155d13a37bSArne Jansen ret = -EINVAL; 42165d13a37bSArne Jansen break; 42175d13a37bSArne Jansen } 42185d13a37bSArne Jansen 42195d13a37bSArne Jansen kfree(sa); 42200b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4221905b0ddaSMiao Xie drop_write: 4222905b0ddaSMiao Xie mnt_drop_write_file(file); 42235d13a37bSArne Jansen return ret; 42245d13a37bSArne Jansen } 42255d13a37bSArne Jansen 4226905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) 42275d13a37bSArne Jansen { 42280b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42290b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 42300b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42315d13a37bSArne Jansen struct btrfs_ioctl_qgroup_assign_args *sa; 42325d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42335d13a37bSArne Jansen int ret; 42345d13a37bSArne Jansen int err; 42355d13a37bSArne Jansen 42365d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42375d13a37bSArne Jansen return -EPERM; 42385d13a37bSArne Jansen 4239905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4240905b0ddaSMiao Xie if (ret) 4241905b0ddaSMiao Xie return ret; 42425d13a37bSArne Jansen 42435d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4244905b0ddaSMiao Xie if (IS_ERR(sa)) { 4245905b0ddaSMiao Xie ret = PTR_ERR(sa); 4246905b0ddaSMiao Xie goto drop_write; 4247905b0ddaSMiao Xie } 42485d13a37bSArne Jansen 42495d13a37bSArne Jansen trans = btrfs_join_transaction(root); 42505d13a37bSArne Jansen if (IS_ERR(trans)) { 42515d13a37bSArne Jansen ret = PTR_ERR(trans); 42525d13a37bSArne Jansen goto out; 42535d13a37bSArne Jansen } 42545d13a37bSArne Jansen 42555d13a37bSArne Jansen if (sa->assign) { 42569f8a6ce6SLu Fengqi ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); 42575d13a37bSArne Jansen } else { 425839616c27SLu Fengqi ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); 42595d13a37bSArne Jansen } 42605d13a37bSArne Jansen 4261e082f563SQu Wenruo /* update qgroup status and info */ 4262280f8bd2SLu Fengqi err = btrfs_run_qgroups(trans); 4263e082f563SQu Wenruo if (err < 0) 42640b246afaSJeff Mahoney btrfs_handle_fs_error(fs_info, err, 4265ad8403dfSAnand Jain "failed to update qgroup status and info"); 42663a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 42675d13a37bSArne Jansen if (err && !ret) 42685d13a37bSArne Jansen ret = err; 42695d13a37bSArne Jansen 42705d13a37bSArne Jansen out: 42715d13a37bSArne Jansen kfree(sa); 4272905b0ddaSMiao Xie drop_write: 4273905b0ddaSMiao Xie mnt_drop_write_file(file); 42745d13a37bSArne Jansen return ret; 42755d13a37bSArne Jansen } 42765d13a37bSArne Jansen 4277905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) 42785d13a37bSArne Jansen { 42790b246afaSJeff Mahoney struct inode *inode = file_inode(file); 42800b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 42815d13a37bSArne Jansen struct btrfs_ioctl_qgroup_create_args *sa; 42825d13a37bSArne Jansen struct btrfs_trans_handle *trans; 42835d13a37bSArne Jansen int ret; 42845d13a37bSArne Jansen int err; 42855d13a37bSArne Jansen 42865d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 42875d13a37bSArne Jansen return -EPERM; 42885d13a37bSArne Jansen 4289905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4290905b0ddaSMiao Xie if (ret) 4291905b0ddaSMiao Xie return ret; 42925d13a37bSArne Jansen 42935d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4294905b0ddaSMiao Xie if (IS_ERR(sa)) { 4295905b0ddaSMiao Xie ret = PTR_ERR(sa); 4296905b0ddaSMiao Xie goto drop_write; 4297905b0ddaSMiao Xie } 42985d13a37bSArne Jansen 4299d86e56cfSMiao Xie if (!sa->qgroupid) { 4300d86e56cfSMiao Xie ret = -EINVAL; 4301d86e56cfSMiao Xie goto out; 4302d86e56cfSMiao Xie } 4303d86e56cfSMiao Xie 43045d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43055d13a37bSArne Jansen if (IS_ERR(trans)) { 43065d13a37bSArne Jansen ret = PTR_ERR(trans); 43075d13a37bSArne Jansen goto out; 43085d13a37bSArne Jansen } 43095d13a37bSArne Jansen 43105d13a37bSArne Jansen if (sa->create) { 431149a05ecdSLu Fengqi ret = btrfs_create_qgroup(trans, sa->qgroupid); 43125d13a37bSArne Jansen } else { 43133efbee1dSLu Fengqi ret = btrfs_remove_qgroup(trans, sa->qgroupid); 43145d13a37bSArne Jansen } 43155d13a37bSArne Jansen 43163a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43175d13a37bSArne Jansen if (err && !ret) 43185d13a37bSArne Jansen ret = err; 43195d13a37bSArne Jansen 43205d13a37bSArne Jansen out: 43215d13a37bSArne Jansen kfree(sa); 4322905b0ddaSMiao Xie drop_write: 4323905b0ddaSMiao Xie mnt_drop_write_file(file); 43245d13a37bSArne Jansen return ret; 43255d13a37bSArne Jansen } 43265d13a37bSArne Jansen 4327905b0ddaSMiao Xie static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) 43285d13a37bSArne Jansen { 43290b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43300b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 43315d13a37bSArne Jansen struct btrfs_ioctl_qgroup_limit_args *sa; 43325d13a37bSArne Jansen struct btrfs_trans_handle *trans; 43335d13a37bSArne Jansen int ret; 43345d13a37bSArne Jansen int err; 43355d13a37bSArne Jansen u64 qgroupid; 43365d13a37bSArne Jansen 43375d13a37bSArne Jansen if (!capable(CAP_SYS_ADMIN)) 43385d13a37bSArne Jansen return -EPERM; 43395d13a37bSArne Jansen 4340905b0ddaSMiao Xie ret = mnt_want_write_file(file); 4341905b0ddaSMiao Xie if (ret) 4342905b0ddaSMiao Xie return ret; 43435d13a37bSArne Jansen 43445d13a37bSArne Jansen sa = memdup_user(arg, sizeof(*sa)); 4345905b0ddaSMiao Xie if (IS_ERR(sa)) { 4346905b0ddaSMiao Xie ret = PTR_ERR(sa); 4347905b0ddaSMiao Xie goto drop_write; 4348905b0ddaSMiao Xie } 43495d13a37bSArne Jansen 43505d13a37bSArne Jansen trans = btrfs_join_transaction(root); 43515d13a37bSArne Jansen if (IS_ERR(trans)) { 43525d13a37bSArne Jansen ret = PTR_ERR(trans); 43535d13a37bSArne Jansen goto out; 43545d13a37bSArne Jansen } 43555d13a37bSArne Jansen 43565d13a37bSArne Jansen qgroupid = sa->qgroupid; 43575d13a37bSArne Jansen if (!qgroupid) { 43585d13a37bSArne Jansen /* take the current subvol as qgroup */ 43595d13a37bSArne Jansen qgroupid = root->root_key.objectid; 43605d13a37bSArne Jansen } 43615d13a37bSArne Jansen 4362f0042d5eSLu Fengqi ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); 43635d13a37bSArne Jansen 43643a45bb20SJeff Mahoney err = btrfs_end_transaction(trans); 43655d13a37bSArne Jansen if (err && !ret) 43665d13a37bSArne Jansen ret = err; 43675d13a37bSArne Jansen 43685d13a37bSArne Jansen out: 43695d13a37bSArne Jansen kfree(sa); 4370905b0ddaSMiao Xie drop_write: 4371905b0ddaSMiao Xie mnt_drop_write_file(file); 43725d13a37bSArne Jansen return ret; 43735d13a37bSArne Jansen } 43745d13a37bSArne Jansen 43752f232036SJan Schmidt static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) 43762f232036SJan Schmidt { 43770b246afaSJeff Mahoney struct inode *inode = file_inode(file); 43780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 43792f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 43802f232036SJan Schmidt int ret; 43812f232036SJan Schmidt 43822f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 43832f232036SJan Schmidt return -EPERM; 43842f232036SJan Schmidt 43852f232036SJan Schmidt ret = mnt_want_write_file(file); 43862f232036SJan Schmidt if (ret) 43872f232036SJan Schmidt return ret; 43882f232036SJan Schmidt 43892f232036SJan Schmidt qsa = memdup_user(arg, sizeof(*qsa)); 43902f232036SJan Schmidt if (IS_ERR(qsa)) { 43912f232036SJan Schmidt ret = PTR_ERR(qsa); 43922f232036SJan Schmidt goto drop_write; 43932f232036SJan Schmidt } 43942f232036SJan Schmidt 43952f232036SJan Schmidt if (qsa->flags) { 43962f232036SJan Schmidt ret = -EINVAL; 43972f232036SJan Schmidt goto out; 43982f232036SJan Schmidt } 43992f232036SJan Schmidt 44000b246afaSJeff Mahoney ret = btrfs_qgroup_rescan(fs_info); 44012f232036SJan Schmidt 44022f232036SJan Schmidt out: 44032f232036SJan Schmidt kfree(qsa); 44042f232036SJan Schmidt drop_write: 44052f232036SJan Schmidt mnt_drop_write_file(file); 44062f232036SJan Schmidt return ret; 44072f232036SJan Schmidt } 44082f232036SJan Schmidt 4409b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, 4410b929c1d8SMarcos Paulo de Souza void __user *arg) 44112f232036SJan Schmidt { 44122f232036SJan Schmidt struct btrfs_ioctl_quota_rescan_args *qsa; 44132f232036SJan Schmidt int ret = 0; 44142f232036SJan Schmidt 44152f232036SJan Schmidt if (!capable(CAP_SYS_ADMIN)) 44162f232036SJan Schmidt return -EPERM; 44172f232036SJan Schmidt 44188d2db785SDavid Sterba qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); 44192f232036SJan Schmidt if (!qsa) 44202f232036SJan Schmidt return -ENOMEM; 44212f232036SJan Schmidt 44220b246afaSJeff Mahoney if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 44232f232036SJan Schmidt qsa->flags = 1; 44240b246afaSJeff Mahoney qsa->progress = fs_info->qgroup_rescan_progress.objectid; 44252f232036SJan Schmidt } 44262f232036SJan Schmidt 44272f232036SJan Schmidt if (copy_to_user(arg, qsa, sizeof(*qsa))) 44282f232036SJan Schmidt ret = -EFAULT; 44292f232036SJan Schmidt 44302f232036SJan Schmidt kfree(qsa); 44312f232036SJan Schmidt return ret; 44322f232036SJan Schmidt } 44332f232036SJan Schmidt 4434b929c1d8SMarcos Paulo de Souza static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, 4435b929c1d8SMarcos Paulo de Souza void __user *arg) 443657254b6eSJan Schmidt { 443757254b6eSJan Schmidt if (!capable(CAP_SYS_ADMIN)) 443857254b6eSJan Schmidt return -EPERM; 443957254b6eSJan Schmidt 44400b246afaSJeff Mahoney return btrfs_qgroup_wait_for_completion(fs_info, true); 444157254b6eSJan Schmidt } 444257254b6eSJan Schmidt 4443abccd00fSHugo Mills static long _btrfs_ioctl_set_received_subvol(struct file *file, 4444abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa) 44458ea05e3aSAlexander Block { 4446496ad9aaSAl Viro struct inode *inode = file_inode(file); 44470b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 44488ea05e3aSAlexander Block struct btrfs_root *root = BTRFS_I(inode)->root; 44498ea05e3aSAlexander Block struct btrfs_root_item *root_item = &root->root_item; 44508ea05e3aSAlexander Block struct btrfs_trans_handle *trans; 445195582b00SDeepa Dinamani struct timespec64 ct = current_time(inode); 44528ea05e3aSAlexander Block int ret = 0; 4453dd5f9615SStefan Behrens int received_uuid_changed; 44548ea05e3aSAlexander Block 4455bd60ea0fSDavid Sterba if (!inode_owner_or_capable(inode)) 4456bd60ea0fSDavid Sterba return -EPERM; 4457bd60ea0fSDavid Sterba 44588ea05e3aSAlexander Block ret = mnt_want_write_file(file); 44598ea05e3aSAlexander Block if (ret < 0) 44608ea05e3aSAlexander Block return ret; 44618ea05e3aSAlexander Block 44620b246afaSJeff Mahoney down_write(&fs_info->subvol_sem); 44638ea05e3aSAlexander Block 44644a0cc7caSNikolay Borisov if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { 44658ea05e3aSAlexander Block ret = -EINVAL; 44668ea05e3aSAlexander Block goto out; 44678ea05e3aSAlexander Block } 44688ea05e3aSAlexander Block 44698ea05e3aSAlexander Block if (btrfs_root_readonly(root)) { 44708ea05e3aSAlexander Block ret = -EROFS; 44718ea05e3aSAlexander Block goto out; 44728ea05e3aSAlexander Block } 44738ea05e3aSAlexander Block 4474dd5f9615SStefan Behrens /* 4475dd5f9615SStefan Behrens * 1 - root item 4476dd5f9615SStefan Behrens * 2 - uuid items (received uuid + subvol uuid) 4477dd5f9615SStefan Behrens */ 4478dd5f9615SStefan Behrens trans = btrfs_start_transaction(root, 3); 44798ea05e3aSAlexander Block if (IS_ERR(trans)) { 44808ea05e3aSAlexander Block ret = PTR_ERR(trans); 44818ea05e3aSAlexander Block trans = NULL; 44828ea05e3aSAlexander Block goto out; 44838ea05e3aSAlexander Block } 44848ea05e3aSAlexander Block 44858ea05e3aSAlexander Block sa->rtransid = trans->transid; 44868ea05e3aSAlexander Block sa->rtime.sec = ct.tv_sec; 44878ea05e3aSAlexander Block sa->rtime.nsec = ct.tv_nsec; 44888ea05e3aSAlexander Block 4489dd5f9615SStefan Behrens received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, 4490dd5f9615SStefan Behrens BTRFS_UUID_SIZE); 4491dd5f9615SStefan Behrens if (received_uuid_changed && 4492d87ff758SNikolay Borisov !btrfs_is_empty_uuid(root_item->received_uuid)) { 4493d1957791SLu Fengqi ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, 4494dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4495dd5f9615SStefan Behrens root->root_key.objectid); 4496d87ff758SNikolay Borisov if (ret && ret != -ENOENT) { 4497d87ff758SNikolay Borisov btrfs_abort_transaction(trans, ret); 4498d87ff758SNikolay Borisov btrfs_end_transaction(trans); 4499d87ff758SNikolay Borisov goto out; 4500d87ff758SNikolay Borisov } 4501d87ff758SNikolay Borisov } 45028ea05e3aSAlexander Block memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); 45038ea05e3aSAlexander Block btrfs_set_root_stransid(root_item, sa->stransid); 45048ea05e3aSAlexander Block btrfs_set_root_rtransid(root_item, sa->rtransid); 45053cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); 45063cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); 45073cae210fSQu Wenruo btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); 45083cae210fSQu Wenruo btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); 45098ea05e3aSAlexander Block 45100b246afaSJeff Mahoney ret = btrfs_update_root(trans, fs_info->tree_root, 45118ea05e3aSAlexander Block &root->root_key, &root->root_item); 45128ea05e3aSAlexander Block if (ret < 0) { 45133a45bb20SJeff Mahoney btrfs_end_transaction(trans); 45148ea05e3aSAlexander Block goto out; 4515dd5f9615SStefan Behrens } 4516dd5f9615SStefan Behrens if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { 4517cdb345a8SLu Fengqi ret = btrfs_uuid_tree_add(trans, sa->uuid, 4518dd5f9615SStefan Behrens BTRFS_UUID_KEY_RECEIVED_SUBVOL, 4519dd5f9615SStefan Behrens root->root_key.objectid); 4520dd5f9615SStefan Behrens if (ret < 0 && ret != -EEXIST) { 452166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 4522efd38150SNikolay Borisov btrfs_end_transaction(trans); 4523dd5f9615SStefan Behrens goto out; 4524dd5f9615SStefan Behrens } 4525dd5f9615SStefan Behrens } 45263a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4527abccd00fSHugo Mills out: 45280b246afaSJeff Mahoney up_write(&fs_info->subvol_sem); 4529abccd00fSHugo Mills mnt_drop_write_file(file); 4530abccd00fSHugo Mills return ret; 4531abccd00fSHugo Mills } 4532abccd00fSHugo Mills 4533abccd00fSHugo Mills #ifdef CONFIG_64BIT 4534abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol_32(struct file *file, 4535abccd00fSHugo Mills void __user *arg) 4536abccd00fSHugo Mills { 4537abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; 4538abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *args64 = NULL; 4539abccd00fSHugo Mills int ret = 0; 4540abccd00fSHugo Mills 4541abccd00fSHugo Mills args32 = memdup_user(arg, sizeof(*args32)); 45427b9ea627SShailendra Verma if (IS_ERR(args32)) 45437b9ea627SShailendra Verma return PTR_ERR(args32); 4544abccd00fSHugo Mills 45458d2db785SDavid Sterba args64 = kmalloc(sizeof(*args64), GFP_KERNEL); 454684dbeb87SDan Carpenter if (!args64) { 454784dbeb87SDan Carpenter ret = -ENOMEM; 4548abccd00fSHugo Mills goto out; 4549abccd00fSHugo Mills } 4550abccd00fSHugo Mills 4551abccd00fSHugo Mills memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); 4552abccd00fSHugo Mills args64->stransid = args32->stransid; 4553abccd00fSHugo Mills args64->rtransid = args32->rtransid; 4554abccd00fSHugo Mills args64->stime.sec = args32->stime.sec; 4555abccd00fSHugo Mills args64->stime.nsec = args32->stime.nsec; 4556abccd00fSHugo Mills args64->rtime.sec = args32->rtime.sec; 4557abccd00fSHugo Mills args64->rtime.nsec = args32->rtime.nsec; 4558abccd00fSHugo Mills args64->flags = args32->flags; 4559abccd00fSHugo Mills 4560abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, args64); 4561abccd00fSHugo Mills if (ret) 4562abccd00fSHugo Mills goto out; 4563abccd00fSHugo Mills 4564abccd00fSHugo Mills memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); 4565abccd00fSHugo Mills args32->stransid = args64->stransid; 4566abccd00fSHugo Mills args32->rtransid = args64->rtransid; 4567abccd00fSHugo Mills args32->stime.sec = args64->stime.sec; 4568abccd00fSHugo Mills args32->stime.nsec = args64->stime.nsec; 4569abccd00fSHugo Mills args32->rtime.sec = args64->rtime.sec; 4570abccd00fSHugo Mills args32->rtime.nsec = args64->rtime.nsec; 4571abccd00fSHugo Mills args32->flags = args64->flags; 4572abccd00fSHugo Mills 4573abccd00fSHugo Mills ret = copy_to_user(arg, args32, sizeof(*args32)); 4574abccd00fSHugo Mills if (ret) 4575abccd00fSHugo Mills ret = -EFAULT; 4576abccd00fSHugo Mills 4577abccd00fSHugo Mills out: 4578abccd00fSHugo Mills kfree(args32); 4579abccd00fSHugo Mills kfree(args64); 4580abccd00fSHugo Mills return ret; 4581abccd00fSHugo Mills } 4582abccd00fSHugo Mills #endif 4583abccd00fSHugo Mills 4584abccd00fSHugo Mills static long btrfs_ioctl_set_received_subvol(struct file *file, 4585abccd00fSHugo Mills void __user *arg) 4586abccd00fSHugo Mills { 4587abccd00fSHugo Mills struct btrfs_ioctl_received_subvol_args *sa = NULL; 4588abccd00fSHugo Mills int ret = 0; 4589abccd00fSHugo Mills 4590abccd00fSHugo Mills sa = memdup_user(arg, sizeof(*sa)); 45917b9ea627SShailendra Verma if (IS_ERR(sa)) 45927b9ea627SShailendra Verma return PTR_ERR(sa); 4593abccd00fSHugo Mills 4594abccd00fSHugo Mills ret = _btrfs_ioctl_set_received_subvol(file, sa); 4595abccd00fSHugo Mills 4596abccd00fSHugo Mills if (ret) 4597abccd00fSHugo Mills goto out; 4598abccd00fSHugo Mills 45998ea05e3aSAlexander Block ret = copy_to_user(arg, sa, sizeof(*sa)); 46008ea05e3aSAlexander Block if (ret) 46018ea05e3aSAlexander Block ret = -EFAULT; 46028ea05e3aSAlexander Block 46038ea05e3aSAlexander Block out: 46048ea05e3aSAlexander Block kfree(sa); 46058ea05e3aSAlexander Block return ret; 46068ea05e3aSAlexander Block } 46078ea05e3aSAlexander Block 4608b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, 4609b929c1d8SMarcos Paulo de Souza void __user *arg) 4610867ab667Sjeff.liu { 4611a1b83ac5SAnand Jain size_t len; 4612867ab667Sjeff.liu int ret; 4613a1b83ac5SAnand Jain char label[BTRFS_LABEL_SIZE]; 4614a1b83ac5SAnand Jain 46150b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 46160b246afaSJeff Mahoney memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); 46170b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 4618a1b83ac5SAnand Jain 4619a1b83ac5SAnand Jain len = strnlen(label, BTRFS_LABEL_SIZE); 4620867ab667Sjeff.liu 4621867ab667Sjeff.liu if (len == BTRFS_LABEL_SIZE) { 46220b246afaSJeff Mahoney btrfs_warn(fs_info, 46230b246afaSJeff Mahoney "label is too long, return the first %zu bytes", 46240b246afaSJeff Mahoney --len); 4625867ab667Sjeff.liu } 4626867ab667Sjeff.liu 4627867ab667Sjeff.liu ret = copy_to_user(arg, label, len); 4628867ab667Sjeff.liu 4629867ab667Sjeff.liu return ret ? -EFAULT : 0; 4630867ab667Sjeff.liu } 4631867ab667Sjeff.liu 4632a8bfd4abSjeff.liu static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) 4633a8bfd4abSjeff.liu { 46340b246afaSJeff Mahoney struct inode *inode = file_inode(file); 46350b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 46360b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 46370b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 4638a8bfd4abSjeff.liu struct btrfs_trans_handle *trans; 4639a8bfd4abSjeff.liu char label[BTRFS_LABEL_SIZE]; 4640a8bfd4abSjeff.liu int ret; 4641a8bfd4abSjeff.liu 4642a8bfd4abSjeff.liu if (!capable(CAP_SYS_ADMIN)) 4643a8bfd4abSjeff.liu return -EPERM; 4644a8bfd4abSjeff.liu 4645a8bfd4abSjeff.liu if (copy_from_user(label, arg, sizeof(label))) 4646a8bfd4abSjeff.liu return -EFAULT; 4647a8bfd4abSjeff.liu 4648a8bfd4abSjeff.liu if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { 46490b246afaSJeff Mahoney btrfs_err(fs_info, 46505d163e0eSJeff Mahoney "unable to set label with more than %d bytes", 4651a8bfd4abSjeff.liu BTRFS_LABEL_SIZE - 1); 4652a8bfd4abSjeff.liu return -EINVAL; 4653a8bfd4abSjeff.liu } 4654a8bfd4abSjeff.liu 4655a8bfd4abSjeff.liu ret = mnt_want_write_file(file); 4656a8bfd4abSjeff.liu if (ret) 4657a8bfd4abSjeff.liu return ret; 4658a8bfd4abSjeff.liu 4659a8bfd4abSjeff.liu trans = btrfs_start_transaction(root, 0); 4660a8bfd4abSjeff.liu if (IS_ERR(trans)) { 4661a8bfd4abSjeff.liu ret = PTR_ERR(trans); 4662a8bfd4abSjeff.liu goto out_unlock; 4663a8bfd4abSjeff.liu } 4664a8bfd4abSjeff.liu 46650b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 4666a8bfd4abSjeff.liu strcpy(super_block->label, label); 46670b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 46683a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 4669a8bfd4abSjeff.liu 4670a8bfd4abSjeff.liu out_unlock: 4671a8bfd4abSjeff.liu mnt_drop_write_file(file); 4672a8bfd4abSjeff.liu return ret; 4673a8bfd4abSjeff.liu } 4674a8bfd4abSjeff.liu 46752eaa055fSJeff Mahoney #define INIT_FEATURE_FLAGS(suffix) \ 46762eaa055fSJeff Mahoney { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ 46772eaa055fSJeff Mahoney .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ 46782eaa055fSJeff Mahoney .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } 46792eaa055fSJeff Mahoney 4680d5131b65SDavid Sterba int btrfs_ioctl_get_supported_features(void __user *arg) 46812eaa055fSJeff Mahoney { 46824d4ab6d6SDavid Sterba static const struct btrfs_ioctl_feature_flags features[3] = { 46832eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SUPP), 46842eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_SET), 46852eaa055fSJeff Mahoney INIT_FEATURE_FLAGS(SAFE_CLEAR) 46862eaa055fSJeff Mahoney }; 46872eaa055fSJeff Mahoney 46882eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 46892eaa055fSJeff Mahoney return -EFAULT; 46902eaa055fSJeff Mahoney 46912eaa055fSJeff Mahoney return 0; 46922eaa055fSJeff Mahoney } 46932eaa055fSJeff Mahoney 4694b929c1d8SMarcos Paulo de Souza static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, 4695b929c1d8SMarcos Paulo de Souza void __user *arg) 46962eaa055fSJeff Mahoney { 46970b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 46982eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags features; 46992eaa055fSJeff Mahoney 47002eaa055fSJeff Mahoney features.compat_flags = btrfs_super_compat_flags(super_block); 47012eaa055fSJeff Mahoney features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); 47022eaa055fSJeff Mahoney features.incompat_flags = btrfs_super_incompat_flags(super_block); 47032eaa055fSJeff Mahoney 47042eaa055fSJeff Mahoney if (copy_to_user(arg, &features, sizeof(features))) 47052eaa055fSJeff Mahoney return -EFAULT; 47062eaa055fSJeff Mahoney 47072eaa055fSJeff Mahoney return 0; 47082eaa055fSJeff Mahoney } 47092eaa055fSJeff Mahoney 47102ff7e61eSJeff Mahoney static int check_feature_bits(struct btrfs_fs_info *fs_info, 47113b02a68aSJeff Mahoney enum btrfs_feature_set set, 47122eaa055fSJeff Mahoney u64 change_mask, u64 flags, u64 supported_flags, 47132eaa055fSJeff Mahoney u64 safe_set, u64 safe_clear) 47142eaa055fSJeff Mahoney { 4715f10152bcSDavid Sterba const char *type = btrfs_feature_set_name(set); 47163b02a68aSJeff Mahoney char *names; 47172eaa055fSJeff Mahoney u64 disallowed, unsupported; 47182eaa055fSJeff Mahoney u64 set_mask = flags & change_mask; 47192eaa055fSJeff Mahoney u64 clear_mask = ~flags & change_mask; 47202eaa055fSJeff Mahoney 47212eaa055fSJeff Mahoney unsupported = set_mask & ~supported_flags; 47222eaa055fSJeff Mahoney if (unsupported) { 47233b02a68aSJeff Mahoney names = btrfs_printable_features(set, unsupported); 47243b02a68aSJeff Mahoney if (names) { 47250b246afaSJeff Mahoney btrfs_warn(fs_info, 47263b02a68aSJeff Mahoney "this kernel does not support the %s feature bit%s", 47273b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47283b02a68aSJeff Mahoney kfree(names); 47293b02a68aSJeff Mahoney } else 47300b246afaSJeff Mahoney btrfs_warn(fs_info, 47312eaa055fSJeff Mahoney "this kernel does not support %s bits 0x%llx", 47322eaa055fSJeff Mahoney type, unsupported); 47332eaa055fSJeff Mahoney return -EOPNOTSUPP; 47342eaa055fSJeff Mahoney } 47352eaa055fSJeff Mahoney 47362eaa055fSJeff Mahoney disallowed = set_mask & ~safe_set; 47372eaa055fSJeff Mahoney if (disallowed) { 47383b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47393b02a68aSJeff Mahoney if (names) { 47400b246afaSJeff Mahoney btrfs_warn(fs_info, 47413b02a68aSJeff Mahoney "can't set the %s feature bit%s while mounted", 47423b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47433b02a68aSJeff Mahoney kfree(names); 47443b02a68aSJeff Mahoney } else 47450b246afaSJeff Mahoney btrfs_warn(fs_info, 47462eaa055fSJeff Mahoney "can't set %s bits 0x%llx while mounted", 47472eaa055fSJeff Mahoney type, disallowed); 47482eaa055fSJeff Mahoney return -EPERM; 47492eaa055fSJeff Mahoney } 47502eaa055fSJeff Mahoney 47512eaa055fSJeff Mahoney disallowed = clear_mask & ~safe_clear; 47522eaa055fSJeff Mahoney if (disallowed) { 47533b02a68aSJeff Mahoney names = btrfs_printable_features(set, disallowed); 47543b02a68aSJeff Mahoney if (names) { 47550b246afaSJeff Mahoney btrfs_warn(fs_info, 47563b02a68aSJeff Mahoney "can't clear the %s feature bit%s while mounted", 47573b02a68aSJeff Mahoney names, strchr(names, ',') ? "s" : ""); 47583b02a68aSJeff Mahoney kfree(names); 47593b02a68aSJeff Mahoney } else 47600b246afaSJeff Mahoney btrfs_warn(fs_info, 47612eaa055fSJeff Mahoney "can't clear %s bits 0x%llx while mounted", 47622eaa055fSJeff Mahoney type, disallowed); 47632eaa055fSJeff Mahoney return -EPERM; 47642eaa055fSJeff Mahoney } 47652eaa055fSJeff Mahoney 47662eaa055fSJeff Mahoney return 0; 47672eaa055fSJeff Mahoney } 47682eaa055fSJeff Mahoney 47692ff7e61eSJeff Mahoney #define check_feature(fs_info, change_mask, flags, mask_base) \ 47702ff7e61eSJeff Mahoney check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ 47712eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SUPP, \ 47722eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ 47732eaa055fSJeff Mahoney BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) 47742eaa055fSJeff Mahoney 47752eaa055fSJeff Mahoney static int btrfs_ioctl_set_features(struct file *file, void __user *arg) 47762eaa055fSJeff Mahoney { 47770b246afaSJeff Mahoney struct inode *inode = file_inode(file); 47780b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 47790b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 47800b246afaSJeff Mahoney struct btrfs_super_block *super_block = fs_info->super_copy; 47812eaa055fSJeff Mahoney struct btrfs_ioctl_feature_flags flags[2]; 47822eaa055fSJeff Mahoney struct btrfs_trans_handle *trans; 47832eaa055fSJeff Mahoney u64 newflags; 47842eaa055fSJeff Mahoney int ret; 47852eaa055fSJeff Mahoney 47862eaa055fSJeff Mahoney if (!capable(CAP_SYS_ADMIN)) 47872eaa055fSJeff Mahoney return -EPERM; 47882eaa055fSJeff Mahoney 47892eaa055fSJeff Mahoney if (copy_from_user(flags, arg, sizeof(flags))) 47902eaa055fSJeff Mahoney return -EFAULT; 47912eaa055fSJeff Mahoney 47922eaa055fSJeff Mahoney /* Nothing to do */ 47932eaa055fSJeff Mahoney if (!flags[0].compat_flags && !flags[0].compat_ro_flags && 47942eaa055fSJeff Mahoney !flags[0].incompat_flags) 47952eaa055fSJeff Mahoney return 0; 47962eaa055fSJeff Mahoney 47972ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_flags, 47982eaa055fSJeff Mahoney flags[1].compat_flags, COMPAT); 47992eaa055fSJeff Mahoney if (ret) 48002eaa055fSJeff Mahoney return ret; 48012eaa055fSJeff Mahoney 48022ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].compat_ro_flags, 48032eaa055fSJeff Mahoney flags[1].compat_ro_flags, COMPAT_RO); 48042eaa055fSJeff Mahoney if (ret) 48052eaa055fSJeff Mahoney return ret; 48062eaa055fSJeff Mahoney 48072ff7e61eSJeff Mahoney ret = check_feature(fs_info, flags[0].incompat_flags, 48082eaa055fSJeff Mahoney flags[1].incompat_flags, INCOMPAT); 48092eaa055fSJeff Mahoney if (ret) 48102eaa055fSJeff Mahoney return ret; 48112eaa055fSJeff Mahoney 48127ab19625SDavid Sterba ret = mnt_want_write_file(file); 48137ab19625SDavid Sterba if (ret) 48147ab19625SDavid Sterba return ret; 48157ab19625SDavid Sterba 48168051aa1aSDavid Sterba trans = btrfs_start_transaction(root, 0); 48177ab19625SDavid Sterba if (IS_ERR(trans)) { 48187ab19625SDavid Sterba ret = PTR_ERR(trans); 48197ab19625SDavid Sterba goto out_drop_write; 48207ab19625SDavid Sterba } 48212eaa055fSJeff Mahoney 48220b246afaSJeff Mahoney spin_lock(&fs_info->super_lock); 48232eaa055fSJeff Mahoney newflags = btrfs_super_compat_flags(super_block); 48242eaa055fSJeff Mahoney newflags |= flags[0].compat_flags & flags[1].compat_flags; 48252eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); 48262eaa055fSJeff Mahoney btrfs_set_super_compat_flags(super_block, newflags); 48272eaa055fSJeff Mahoney 48282eaa055fSJeff Mahoney newflags = btrfs_super_compat_ro_flags(super_block); 48292eaa055fSJeff Mahoney newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; 48302eaa055fSJeff Mahoney newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); 48312eaa055fSJeff Mahoney btrfs_set_super_compat_ro_flags(super_block, newflags); 48322eaa055fSJeff Mahoney 48332eaa055fSJeff Mahoney newflags = btrfs_super_incompat_flags(super_block); 48342eaa055fSJeff Mahoney newflags |= flags[0].incompat_flags & flags[1].incompat_flags; 48352eaa055fSJeff Mahoney newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); 48362eaa055fSJeff Mahoney btrfs_set_super_incompat_flags(super_block, newflags); 48370b246afaSJeff Mahoney spin_unlock(&fs_info->super_lock); 48382eaa055fSJeff Mahoney 48393a45bb20SJeff Mahoney ret = btrfs_commit_transaction(trans); 48407ab19625SDavid Sterba out_drop_write: 48417ab19625SDavid Sterba mnt_drop_write_file(file); 48427ab19625SDavid Sterba 48437ab19625SDavid Sterba return ret; 48442eaa055fSJeff Mahoney } 48452eaa055fSJeff Mahoney 48462351f431SJosef Bacik static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) 48472351f431SJosef Bacik { 48482351f431SJosef Bacik struct btrfs_ioctl_send_args *arg; 48492351f431SJosef Bacik int ret; 48502351f431SJosef Bacik 48512351f431SJosef Bacik if (compat) { 48522351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 48532351f431SJosef Bacik struct btrfs_ioctl_send_args_32 args32; 48542351f431SJosef Bacik 48552351f431SJosef Bacik ret = copy_from_user(&args32, argp, sizeof(args32)); 48562351f431SJosef Bacik if (ret) 48572351f431SJosef Bacik return -EFAULT; 48582351f431SJosef Bacik arg = kzalloc(sizeof(*arg), GFP_KERNEL); 48592351f431SJosef Bacik if (!arg) 48602351f431SJosef Bacik return -ENOMEM; 48612351f431SJosef Bacik arg->send_fd = args32.send_fd; 48622351f431SJosef Bacik arg->clone_sources_count = args32.clone_sources_count; 48632351f431SJosef Bacik arg->clone_sources = compat_ptr(args32.clone_sources); 48642351f431SJosef Bacik arg->parent_root = args32.parent_root; 48652351f431SJosef Bacik arg->flags = args32.flags; 48662351f431SJosef Bacik memcpy(arg->reserved, args32.reserved, 48672351f431SJosef Bacik sizeof(args32.reserved)); 48682351f431SJosef Bacik #else 48692351f431SJosef Bacik return -ENOTTY; 48702351f431SJosef Bacik #endif 48712351f431SJosef Bacik } else { 48722351f431SJosef Bacik arg = memdup_user(argp, sizeof(*arg)); 48732351f431SJosef Bacik if (IS_ERR(arg)) 48742351f431SJosef Bacik return PTR_ERR(arg); 48752351f431SJosef Bacik } 48762351f431SJosef Bacik ret = btrfs_ioctl_send(file, arg); 48772351f431SJosef Bacik kfree(arg); 48782351f431SJosef Bacik return ret; 48792351f431SJosef Bacik } 48802351f431SJosef Bacik 4881f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 4882f46b5a66SChristoph Hellwig cmd, unsigned long arg) 4883f46b5a66SChristoph Hellwig { 48840b246afaSJeff Mahoney struct inode *inode = file_inode(file); 48850b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); 48860b246afaSJeff Mahoney struct btrfs_root *root = BTRFS_I(inode)->root; 48874bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 4888f46b5a66SChristoph Hellwig 4889f46b5a66SChristoph Hellwig switch (cmd) { 48906cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 48916cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 48926cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 48936cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 48946cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 48956cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 489640cf931fSEric Sandeen case FS_IOC_GETFSLABEL: 4897b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_fslabel(fs_info, argp); 489840cf931fSEric Sandeen case FS_IOC_SETFSLABEL: 489940cf931fSEric Sandeen return btrfs_ioctl_set_fslabel(file, argp); 4900f7039b1dSLi Dongyang case FITRIM: 4901b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_fitrim(fs_info, argp); 4902f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 4903fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 4904fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 4905fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 49063de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 4907fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 49086f72c7e2SArne Jansen case BTRFS_IOC_SUBVOL_CREATE_V2: 49096f72c7e2SArne Jansen return btrfs_ioctl_snap_create_v2(file, argp, 1); 491076dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 4911949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, false); 4912949964c9SMarcos Paulo de Souza case BTRFS_IOC_SNAP_DESTROY_V2: 4913949964c9SMarcos Paulo de Souza return btrfs_ioctl_snap_destroy(file, argp, true); 49140caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 49150caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 49160caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 49170caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 49186ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 49196ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 4920f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 49211e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 49221e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 49231e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 4924f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 4925198605a8SMiao Xie return btrfs_ioctl_resize(file, argp); 4926f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 49272ff7e61eSJeff Mahoney return btrfs_ioctl_add_dev(fs_info, argp); 4928f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 4929da24927bSMiao Xie return btrfs_ioctl_rm_dev(file, argp); 49306b526ed7SAnand Jain case BTRFS_IOC_RM_DEV_V2: 49316b526ed7SAnand Jain return btrfs_ioctl_rm_dev_v2(file, argp); 4932475f6387SJan Schmidt case BTRFS_IOC_FS_INFO: 49332ff7e61eSJeff Mahoney return btrfs_ioctl_fs_info(fs_info, argp); 4934475f6387SJan Schmidt case BTRFS_IOC_DEV_INFO: 49352ff7e61eSJeff Mahoney return btrfs_ioctl_dev_info(fs_info, argp); 4936f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 49379ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, NULL); 4938ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 4939ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 4940cc68a8a5SGerhard Heift case BTRFS_IOC_TREE_SEARCH_V2: 4941cc68a8a5SGerhard Heift return btrfs_ioctl_tree_search_v2(file, argp); 4942ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 4943ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 4944d7728c96SJan Schmidt case BTRFS_IOC_INO_PATHS: 4945d7728c96SJan Schmidt return btrfs_ioctl_ino_to_path(root, argp); 4946d7728c96SJan Schmidt case BTRFS_IOC_LOGICAL_INO: 4947d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); 4948d24a67b2SZygo Blaxell case BTRFS_IOC_LOGICAL_INO_V2: 4949d24a67b2SZygo Blaxell return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); 49501406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 49512ff7e61eSJeff Mahoney return btrfs_ioctl_space_info(fs_info, argp); 49529b199859SFilipe David Borba Manana case BTRFS_IOC_SYNC: { 49539b199859SFilipe David Borba Manana int ret; 49549b199859SFilipe David Borba Manana 4955b4912139SJosef Bacik ret = btrfs_start_delalloc_roots(fs_info, U64_MAX); 49569b199859SFilipe David Borba Manana if (ret) 49579b199859SFilipe David Borba Manana return ret; 49580b246afaSJeff Mahoney ret = btrfs_sync_fs(inode->i_sb, 1); 49592fad4e83SDavid Sterba /* 49602fad4e83SDavid Sterba * The transaction thread may want to do more work, 496101327610SNicholas D Steeves * namely it pokes the cleaner kthread that will start 49622fad4e83SDavid Sterba * processing uncleaned subvols. 49632fad4e83SDavid Sterba */ 49640b246afaSJeff Mahoney wake_up_process(fs_info->transaction_kthread); 49659b199859SFilipe David Borba Manana return ret; 49669b199859SFilipe David Borba Manana } 496746204592SSage Weil case BTRFS_IOC_START_SYNC: 49689a8c28beSMiao Xie return btrfs_ioctl_start_sync(root, argp); 496946204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 49702ff7e61eSJeff Mahoney return btrfs_ioctl_wait_sync(fs_info, argp); 4971475f6387SJan Schmidt case BTRFS_IOC_SCRUB: 4972b8e95489SMiao Xie return btrfs_ioctl_scrub(file, argp); 4973475f6387SJan Schmidt case BTRFS_IOC_SCRUB_CANCEL: 49742ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_cancel(fs_info); 4975475f6387SJan Schmidt case BTRFS_IOC_SCRUB_PROGRESS: 49762ff7e61eSJeff Mahoney return btrfs_ioctl_scrub_progress(fs_info, argp); 4977c9e9f97bSIlya Dryomov case BTRFS_IOC_BALANCE_V2: 49789ba1f6e4SLiu Bo return btrfs_ioctl_balance(file, argp); 4979837d5b6eSIlya Dryomov case BTRFS_IOC_BALANCE_CTL: 49802ff7e61eSJeff Mahoney return btrfs_ioctl_balance_ctl(fs_info, arg); 498119a39dceSIlya Dryomov case BTRFS_IOC_BALANCE_PROGRESS: 49822ff7e61eSJeff Mahoney return btrfs_ioctl_balance_progress(fs_info, argp); 49838ea05e3aSAlexander Block case BTRFS_IOC_SET_RECEIVED_SUBVOL: 49848ea05e3aSAlexander Block return btrfs_ioctl_set_received_subvol(file, argp); 4985abccd00fSHugo Mills #ifdef CONFIG_64BIT 4986abccd00fSHugo Mills case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: 4987abccd00fSHugo Mills return btrfs_ioctl_set_received_subvol_32(file, argp); 4988abccd00fSHugo Mills #endif 498931db9f7cSAlexander Block case BTRFS_IOC_SEND: 49902351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, false); 49912351f431SJosef Bacik #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) 49922351f431SJosef Bacik case BTRFS_IOC_SEND_32: 49932351f431SJosef Bacik return _btrfs_ioctl_send(file, argp, true); 49942351f431SJosef Bacik #endif 4995c11d2c23SStefan Behrens case BTRFS_IOC_GET_DEV_STATS: 49962ff7e61eSJeff Mahoney return btrfs_ioctl_get_dev_stats(fs_info, argp); 49975d13a37bSArne Jansen case BTRFS_IOC_QUOTA_CTL: 4998905b0ddaSMiao Xie return btrfs_ioctl_quota_ctl(file, argp); 49995d13a37bSArne Jansen case BTRFS_IOC_QGROUP_ASSIGN: 5000905b0ddaSMiao Xie return btrfs_ioctl_qgroup_assign(file, argp); 50015d13a37bSArne Jansen case BTRFS_IOC_QGROUP_CREATE: 5002905b0ddaSMiao Xie return btrfs_ioctl_qgroup_create(file, argp); 50035d13a37bSArne Jansen case BTRFS_IOC_QGROUP_LIMIT: 5004905b0ddaSMiao Xie return btrfs_ioctl_qgroup_limit(file, argp); 50052f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN: 50062f232036SJan Schmidt return btrfs_ioctl_quota_rescan(file, argp); 50072f232036SJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_STATUS: 5008b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_status(fs_info, argp); 500957254b6eSJan Schmidt case BTRFS_IOC_QUOTA_RESCAN_WAIT: 5010b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_quota_rescan_wait(fs_info, argp); 50113f6bcfbdSStefan Behrens case BTRFS_IOC_DEV_REPLACE: 50122ff7e61eSJeff Mahoney return btrfs_ioctl_dev_replace(fs_info, argp); 50132eaa055fSJeff Mahoney case BTRFS_IOC_GET_SUPPORTED_FEATURES: 5014d5131b65SDavid Sterba return btrfs_ioctl_get_supported_features(argp); 50152eaa055fSJeff Mahoney case BTRFS_IOC_GET_FEATURES: 5016b929c1d8SMarcos Paulo de Souza return btrfs_ioctl_get_features(fs_info, argp); 50172eaa055fSJeff Mahoney case BTRFS_IOC_SET_FEATURES: 50182eaa055fSJeff Mahoney return btrfs_ioctl_set_features(file, argp); 5019e4202ac9SDavid Sterba case FS_IOC_FSGETXATTR: 5020e4202ac9SDavid Sterba return btrfs_ioctl_fsgetxattr(file, argp); 5021025f2121SDavid Sterba case FS_IOC_FSSETXATTR: 5022025f2121SDavid Sterba return btrfs_ioctl_fssetxattr(file, argp); 5023b64ec075STomohiro Misono case BTRFS_IOC_GET_SUBVOL_INFO: 5024b64ec075STomohiro Misono return btrfs_ioctl_get_subvol_info(file, argp); 502542e4b520STomohiro Misono case BTRFS_IOC_GET_SUBVOL_ROOTREF: 502642e4b520STomohiro Misono return btrfs_ioctl_get_subvol_rootref(file, argp); 502723d0b79dSTomohiro Misono case BTRFS_IOC_INO_LOOKUP_USER: 502823d0b79dSTomohiro Misono return btrfs_ioctl_ino_lookup_user(file, argp); 5029f46b5a66SChristoph Hellwig } 5030f46b5a66SChristoph Hellwig 5031f46b5a66SChristoph Hellwig return -ENOTTY; 5032f46b5a66SChristoph Hellwig } 50334c63c245SLuke Dashjr 50344c63c245SLuke Dashjr #ifdef CONFIG_COMPAT 50354c63c245SLuke Dashjr long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 50364c63c245SLuke Dashjr { 50372a362249SJeff Mahoney /* 50382a362249SJeff Mahoney * These all access 32-bit values anyway so no further 50392a362249SJeff Mahoney * handling is necessary. 50402a362249SJeff Mahoney */ 50414c63c245SLuke Dashjr switch (cmd) { 50424c63c245SLuke Dashjr case FS_IOC32_GETFLAGS: 50434c63c245SLuke Dashjr cmd = FS_IOC_GETFLAGS; 50444c63c245SLuke Dashjr break; 50454c63c245SLuke Dashjr case FS_IOC32_SETFLAGS: 50464c63c245SLuke Dashjr cmd = FS_IOC_SETFLAGS; 50474c63c245SLuke Dashjr break; 50484c63c245SLuke Dashjr case FS_IOC32_GETVERSION: 50494c63c245SLuke Dashjr cmd = FS_IOC_GETVERSION; 50504c63c245SLuke Dashjr break; 50514c63c245SLuke Dashjr } 50524c63c245SLuke Dashjr 50534c63c245SLuke Dashjr return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 50544c63c245SLuke Dashjr } 50554c63c245SLuke Dashjr #endif 5056