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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f46b5a66 CH |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
f46b5a66 CH |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/bio.h> | |
f46b5a66 CH |
8 | #include <linux/file.h> |
9 | #include <linux/fs.h> | |
cb8e7090 | 10 | #include <linux/fsnotify.h> |
f46b5a66 CH |
11 | #include <linux/pagemap.h> |
12 | #include <linux/highmem.h> | |
13 | #include <linux/time.h> | |
f46b5a66 | 14 | #include <linux/string.h> |
f46b5a66 | 15 | #include <linux/backing-dev.h> |
cb8e7090 | 16 | #include <linux/mount.h> |
cb8e7090 | 17 | #include <linux/namei.h> |
f46b5a66 | 18 | #include <linux/writeback.h> |
f46b5a66 | 19 | #include <linux/compat.h> |
cb8e7090 | 20 | #include <linux/security.h> |
f46b5a66 | 21 | #include <linux/xattr.h> |
f54de068 | 22 | #include <linux/mm.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
f7039b1d | 24 | #include <linux/blkdev.h> |
8ea05e3a | 25 | #include <linux/uuid.h> |
55e301fd | 26 | #include <linux/btrfs.h> |
416161db | 27 | #include <linux/uaccess.h> |
ae5e165d | 28 | #include <linux/iversion.h> |
97fc2977 | 29 | #include <linux/fileattr.h> |
14605409 | 30 | #include <linux/fsverity.h> |
1881fba8 | 31 | #include <linux/sched/xacct.h> |
f46b5a66 CH |
32 | #include "ctree.h" |
33 | #include "disk-io.h" | |
949964c9 | 34 | #include "export.h" |
f46b5a66 CH |
35 | #include "transaction.h" |
36 | #include "btrfs_inode.h" | |
f46b5a66 CH |
37 | #include "print-tree.h" |
38 | #include "volumes.h" | |
925baedd | 39 | #include "locking.h" |
d7728c96 | 40 | #include "backref.h" |
606686ee | 41 | #include "rcu-string.h" |
31db9f7c | 42 | #include "send.h" |
3f6bcfbd | 43 | #include "dev-replace.h" |
63541927 | 44 | #include "props.h" |
3b02a68a | 45 | #include "sysfs.h" |
fcebe456 | 46 | #include "qgroup.h" |
1ec9a1ae | 47 | #include "tree-log.h" |
ebb8765b | 48 | #include "compression.h" |
8719aaae | 49 | #include "space-info.h" |
86736342 | 50 | #include "delalloc-space.h" |
aac0023c | 51 | #include "block-group.h" |
22b398ee | 52 | #include "subpage.h" |
c7f13d42 | 53 | #include "fs.h" |
07e81dc9 | 54 | #include "accessors.h" |
a0231804 | 55 | #include "extent-tree.h" |
45c40c8f | 56 | #include "root-tree.h" |
59b818e0 | 57 | #include "defrag.h" |
f2b39277 | 58 | #include "dir-item.h" |
c7a03b52 | 59 | #include "uuid-tree.h" |
7572dec8 | 60 | #include "ioctl.h" |
af142b6f | 61 | #include "file.h" |
2fc6822c | 62 | #include "scrub.h" |
c03b2207 | 63 | #include "super.h" |
f46b5a66 | 64 | |
abccd00f HM |
65 | #ifdef CONFIG_64BIT |
66 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
67 | * structures are incorrect, as the timespec structure from userspace | |
68 | * is 4 bytes too small. We define these alternatives here to teach | |
69 | * the kernel about the 32-bit struct packing. | |
70 | */ | |
71 | struct btrfs_ioctl_timespec_32 { | |
72 | __u64 sec; | |
73 | __u32 nsec; | |
74 | } __attribute__ ((__packed__)); | |
75 | ||
76 | struct btrfs_ioctl_received_subvol_args_32 { | |
77 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
78 | __u64 stransid; /* in */ | |
79 | __u64 rtransid; /* out */ | |
80 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
81 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
82 | __u64 flags; /* in */ | |
83 | __u64 reserved[16]; /* in */ | |
84 | } __attribute__ ((__packed__)); | |
85 | ||
86 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
87 | struct btrfs_ioctl_received_subvol_args_32) | |
88 | #endif | |
89 | ||
2351f431 JB |
90 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
91 | struct btrfs_ioctl_send_args_32 { | |
92 | __s64 send_fd; /* in */ | |
93 | __u64 clone_sources_count; /* in */ | |
94 | compat_uptr_t clone_sources; /* in */ | |
95 | __u64 parent_root; /* in */ | |
96 | __u64 flags; /* in */ | |
e77fbf99 DS |
97 | __u32 version; /* in */ |
98 | __u8 reserved[28]; /* in */ | |
2351f431 JB |
99 | } __attribute__ ((__packed__)); |
100 | ||
101 | #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ | |
102 | struct btrfs_ioctl_send_args_32) | |
1881fba8 OS |
103 | |
104 | struct btrfs_ioctl_encoded_io_args_32 { | |
105 | compat_uptr_t iov; | |
106 | compat_ulong_t iovcnt; | |
107 | __s64 offset; | |
108 | __u64 flags; | |
109 | __u64 len; | |
110 | __u64 unencoded_len; | |
111 | __u64 unencoded_offset; | |
112 | __u32 compression; | |
113 | __u32 encryption; | |
114 | __u8 reserved[64]; | |
115 | }; | |
116 | ||
117 | #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ | |
118 | struct btrfs_ioctl_encoded_io_args_32) | |
7c0c7269 OS |
119 | #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \ |
120 | struct btrfs_ioctl_encoded_io_args_32) | |
2351f431 | 121 | #endif |
abccd00f | 122 | |
6cbff00f | 123 | /* Mask out flags that are inappropriate for the given type of inode. */ |
1905a0f7 DS |
124 | static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, |
125 | unsigned int flags) | |
6cbff00f | 126 | { |
1905a0f7 | 127 | if (S_ISDIR(inode->i_mode)) |
6cbff00f | 128 | return flags; |
1905a0f7 | 129 | else if (S_ISREG(inode->i_mode)) |
6cbff00f CH |
130 | return flags & ~FS_DIRSYNC_FL; |
131 | else | |
132 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
133 | } | |
134 | ||
135 | /* | |
a157d4fd DS |
136 | * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS |
137 | * ioctl. | |
6cbff00f | 138 | */ |
77eea05e | 139 | static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) |
6cbff00f CH |
140 | { |
141 | unsigned int iflags = 0; | |
77eea05e | 142 | u32 flags = binode->flags; |
14605409 | 143 | u32 ro_flags = binode->ro_flags; |
6cbff00f CH |
144 | |
145 | if (flags & BTRFS_INODE_SYNC) | |
146 | iflags |= FS_SYNC_FL; | |
147 | if (flags & BTRFS_INODE_IMMUTABLE) | |
148 | iflags |= FS_IMMUTABLE_FL; | |
149 | if (flags & BTRFS_INODE_APPEND) | |
150 | iflags |= FS_APPEND_FL; | |
151 | if (flags & BTRFS_INODE_NODUMP) | |
152 | iflags |= FS_NODUMP_FL; | |
153 | if (flags & BTRFS_INODE_NOATIME) | |
154 | iflags |= FS_NOATIME_FL; | |
155 | if (flags & BTRFS_INODE_DIRSYNC) | |
156 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
157 | if (flags & BTRFS_INODE_NODATACOW) |
158 | iflags |= FS_NOCOW_FL; | |
14605409 BB |
159 | if (ro_flags & BTRFS_INODE_RO_VERITY) |
160 | iflags |= FS_VERITY_FL; | |
d0092bdd | 161 | |
13f48dc9 | 162 | if (flags & BTRFS_INODE_NOCOMPRESS) |
d0092bdd | 163 | iflags |= FS_NOCOMP_FL; |
13f48dc9 ST |
164 | else if (flags & BTRFS_INODE_COMPRESS) |
165 | iflags |= FS_COMPR_FL; | |
6cbff00f CH |
166 | |
167 | return iflags; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Update inode->i_flags based on the btrfs internal flags. | |
172 | */ | |
7b6a221e | 173 | void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) |
6cbff00f | 174 | { |
5c57b8b6 | 175 | struct btrfs_inode *binode = BTRFS_I(inode); |
3cc79392 | 176 | unsigned int new_fl = 0; |
6cbff00f | 177 | |
5c57b8b6 | 178 | if (binode->flags & BTRFS_INODE_SYNC) |
3cc79392 | 179 | new_fl |= S_SYNC; |
5c57b8b6 | 180 | if (binode->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 181 | new_fl |= S_IMMUTABLE; |
5c57b8b6 | 182 | if (binode->flags & BTRFS_INODE_APPEND) |
3cc79392 | 183 | new_fl |= S_APPEND; |
5c57b8b6 | 184 | if (binode->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 185 | new_fl |= S_NOATIME; |
5c57b8b6 | 186 | if (binode->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 | 187 | new_fl |= S_DIRSYNC; |
14605409 BB |
188 | if (binode->ro_flags & BTRFS_INODE_RO_VERITY) |
189 | new_fl |= S_VERITY; | |
3cc79392 FM |
190 | |
191 | set_mask_bits(&inode->i_flags, | |
14605409 BB |
192 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | |
193 | S_VERITY, new_fl); | |
6cbff00f CH |
194 | } |
195 | ||
f37c563b DS |
196 | /* |
197 | * Check if @flags are a supported and valid set of FS_*_FL flags and that | |
198 | * the old and new flags are not conflicting | |
199 | */ | |
200 | static int check_fsflags(unsigned int old_flags, unsigned int flags) | |
75e7cb7f LB |
201 | { |
202 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
203 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
204 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
205 | FS_NOCOMP_FL | FS_COMPR_FL | |
206 | FS_NOCOW_FL)) | |
75e7cb7f LB |
207 | return -EOPNOTSUPP; |
208 | ||
f37c563b | 209 | /* COMPR and NOCOMP on new/old are valid */ |
75e7cb7f LB |
210 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) |
211 | return -EINVAL; | |
212 | ||
f37c563b DS |
213 | if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) |
214 | return -EINVAL; | |
215 | ||
216 | /* NOCOW and compression options are mutually exclusive */ | |
217 | if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) | |
218 | return -EINVAL; | |
219 | if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) | |
220 | return -EINVAL; | |
221 | ||
75e7cb7f LB |
222 | return 0; |
223 | } | |
224 | ||
d206e9c9 NA |
225 | static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, |
226 | unsigned int flags) | |
227 | { | |
228 | if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) | |
229 | return -EPERM; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
97fc2977 MS |
234 | /* |
235 | * Set flags/xflags from the internal inode flags. The remaining items of | |
236 | * fsxattr are zeroed. | |
237 | */ | |
238 | int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) | |
6cbff00f | 239 | { |
97fc2977 MS |
240 | struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); |
241 | ||
77eea05e | 242 | fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); |
97fc2977 MS |
243 | return 0; |
244 | } | |
245 | ||
246 | int btrfs_fileattr_set(struct user_namespace *mnt_userns, | |
247 | struct dentry *dentry, struct fileattr *fa) | |
248 | { | |
249 | struct inode *inode = d_inode(dentry); | |
0b246afa | 250 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
5c57b8b6 DS |
251 | struct btrfs_inode *binode = BTRFS_I(inode); |
252 | struct btrfs_root *root = binode->root; | |
6cbff00f | 253 | struct btrfs_trans_handle *trans; |
5aca2842 | 254 | unsigned int fsflags, old_fsflags; |
6cbff00f | 255 | int ret; |
ff9fef55 | 256 | const char *comp = NULL; |
f37c563b | 257 | u32 binode_flags; |
6cbff00f | 258 | |
b83cc969 LZ |
259 | if (btrfs_root_readonly(root)) |
260 | return -EROFS; | |
261 | ||
97fc2977 MS |
262 | if (fileattr_has_fsx(fa)) |
263 | return -EOPNOTSUPP; | |
e7848683 | 264 | |
97fc2977 | 265 | fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); |
77eea05e | 266 | old_fsflags = btrfs_inode_flags_to_fsflags(binode); |
f37c563b DS |
267 | ret = check_fsflags(old_fsflags, fsflags); |
268 | if (ret) | |
97fc2977 | 269 | return ret; |
f37c563b | 270 | |
d206e9c9 NA |
271 | ret = check_fsflags_compatible(fs_info, fsflags); |
272 | if (ret) | |
97fc2977 | 273 | return ret; |
d206e9c9 | 274 | |
f37c563b | 275 | binode_flags = binode->flags; |
5c57b8b6 | 276 | if (fsflags & FS_SYNC_FL) |
d2b8fcfe | 277 | binode_flags |= BTRFS_INODE_SYNC; |
6cbff00f | 278 | else |
d2b8fcfe | 279 | binode_flags &= ~BTRFS_INODE_SYNC; |
5c57b8b6 | 280 | if (fsflags & FS_IMMUTABLE_FL) |
d2b8fcfe | 281 | binode_flags |= BTRFS_INODE_IMMUTABLE; |
6cbff00f | 282 | else |
d2b8fcfe | 283 | binode_flags &= ~BTRFS_INODE_IMMUTABLE; |
5c57b8b6 | 284 | if (fsflags & FS_APPEND_FL) |
d2b8fcfe | 285 | binode_flags |= BTRFS_INODE_APPEND; |
6cbff00f | 286 | else |
d2b8fcfe | 287 | binode_flags &= ~BTRFS_INODE_APPEND; |
5c57b8b6 | 288 | if (fsflags & FS_NODUMP_FL) |
d2b8fcfe | 289 | binode_flags |= BTRFS_INODE_NODUMP; |
6cbff00f | 290 | else |
d2b8fcfe | 291 | binode_flags &= ~BTRFS_INODE_NODUMP; |
5c57b8b6 | 292 | if (fsflags & FS_NOATIME_FL) |
d2b8fcfe | 293 | binode_flags |= BTRFS_INODE_NOATIME; |
6cbff00f | 294 | else |
d2b8fcfe | 295 | binode_flags &= ~BTRFS_INODE_NOATIME; |
97fc2977 MS |
296 | |
297 | /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ | |
298 | if (!fa->flags_valid) { | |
299 | /* 1 item for the inode */ | |
300 | trans = btrfs_start_transaction(root, 1); | |
9b8a233b RH |
301 | if (IS_ERR(trans)) |
302 | return PTR_ERR(trans); | |
97fc2977 MS |
303 | goto update_flags; |
304 | } | |
305 | ||
5c57b8b6 | 306 | if (fsflags & FS_DIRSYNC_FL) |
d2b8fcfe | 307 | binode_flags |= BTRFS_INODE_DIRSYNC; |
6cbff00f | 308 | else |
d2b8fcfe | 309 | binode_flags &= ~BTRFS_INODE_DIRSYNC; |
5c57b8b6 | 310 | if (fsflags & FS_NOCOW_FL) { |
44e5194b | 311 | if (S_ISREG(inode->i_mode)) { |
7e97b8da DS |
312 | /* |
313 | * It's safe to turn csums off here, no extents exist. | |
314 | * Otherwise we want the flag to reflect the real COW | |
315 | * status of the file and will not set it. | |
316 | */ | |
317 | if (inode->i_size == 0) | |
d2b8fcfe AJ |
318 | binode_flags |= BTRFS_INODE_NODATACOW | |
319 | BTRFS_INODE_NODATASUM; | |
7e97b8da | 320 | } else { |
d2b8fcfe | 321 | binode_flags |= BTRFS_INODE_NODATACOW; |
7e97b8da DS |
322 | } |
323 | } else { | |
324 | /* | |
01327610 | 325 | * Revert back under same assumptions as above |
7e97b8da | 326 | */ |
44e5194b | 327 | if (S_ISREG(inode->i_mode)) { |
7e97b8da | 328 | if (inode->i_size == 0) |
d2b8fcfe AJ |
329 | binode_flags &= ~(BTRFS_INODE_NODATACOW | |
330 | BTRFS_INODE_NODATASUM); | |
7e97b8da | 331 | } else { |
d2b8fcfe | 332 | binode_flags &= ~BTRFS_INODE_NODATACOW; |
7e97b8da DS |
333 | } |
334 | } | |
6cbff00f | 335 | |
75e7cb7f LB |
336 | /* |
337 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
338 | * flag may be changed automatically if compression code won't make | |
339 | * things smaller. | |
340 | */ | |
5c57b8b6 | 341 | if (fsflags & FS_NOCOMP_FL) { |
d2b8fcfe AJ |
342 | binode_flags &= ~BTRFS_INODE_COMPRESS; |
343 | binode_flags |= BTRFS_INODE_NOCOMPRESS; | |
5c57b8b6 | 344 | } else if (fsflags & FS_COMPR_FL) { |
63541927 | 345 | |
97fc2977 MS |
346 | if (IS_SWAPFILE(inode)) |
347 | return -ETXTBSY; | |
eede2bf3 | 348 | |
d2b8fcfe AJ |
349 | binode_flags |= BTRFS_INODE_COMPRESS; |
350 | binode_flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 | 351 | |
93370509 DS |
352 | comp = btrfs_compress_type2str(fs_info->compress_type); |
353 | if (!comp || comp[0] == 0) | |
354 | comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); | |
ebcb904d | 355 | } else { |
d2b8fcfe | 356 | binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 357 | } |
6cbff00f | 358 | |
ff9fef55 AJ |
359 | /* |
360 | * 1 for inode item | |
361 | * 2 for properties | |
362 | */ | |
363 | trans = btrfs_start_transaction(root, 3); | |
97fc2977 MS |
364 | if (IS_ERR(trans)) |
365 | return PTR_ERR(trans); | |
6cbff00f | 366 | |
ff9fef55 AJ |
367 | if (comp) { |
368 | ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, | |
369 | strlen(comp), 0); | |
370 | if (ret) { | |
371 | btrfs_abort_transaction(trans, ret); | |
372 | goto out_end_trans; | |
373 | } | |
ff9fef55 AJ |
374 | } else { |
375 | ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, | |
376 | 0, 0); | |
377 | if (ret && ret != -ENODATA) { | |
378 | btrfs_abort_transaction(trans, ret); | |
379 | goto out_end_trans; | |
380 | } | |
381 | } | |
382 | ||
97fc2977 | 383 | update_flags: |
d2b8fcfe | 384 | binode->flags = binode_flags; |
7b6a221e | 385 | btrfs_sync_inode_flags_to_i_flags(inode); |
0c4d2d95 | 386 | inode_inc_iversion(inode); |
c2050a45 | 387 | inode->i_ctime = current_time(inode); |
9a56fcd1 | 388 | ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); |
6cbff00f | 389 | |
ff9fef55 | 390 | out_end_trans: |
3a45bb20 | 391 | btrfs_end_transaction(trans); |
2d4e6f6a | 392 | return ret; |
6cbff00f CH |
393 | } |
394 | ||
0d7ed32c DS |
395 | /* |
396 | * Start exclusive operation @type, return true on success | |
397 | */ | |
c3e1f96c GR |
398 | bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, |
399 | enum btrfs_exclusive_operation type) | |
400 | { | |
0d7ed32c DS |
401 | bool ret = false; |
402 | ||
403 | spin_lock(&fs_info->super_lock); | |
404 | if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { | |
405 | fs_info->exclusive_operation = type; | |
406 | ret = true; | |
407 | } | |
408 | spin_unlock(&fs_info->super_lock); | |
409 | ||
410 | return ret; | |
c3e1f96c GR |
411 | } |
412 | ||
578bda9e DS |
413 | /* |
414 | * Conditionally allow to enter the exclusive operation in case it's compatible | |
415 | * with the running one. This must be paired with btrfs_exclop_start_unlock and | |
416 | * btrfs_exclop_finish. | |
417 | * | |
418 | * Compatibility: | |
419 | * - the same type is already running | |
621a1ee1 | 420 | * - when trying to add a device and balance has been paused |
578bda9e DS |
421 | * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller |
422 | * must check the condition first that would allow none -> @type | |
423 | */ | |
424 | bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, | |
425 | enum btrfs_exclusive_operation type) | |
426 | { | |
427 | spin_lock(&fs_info->super_lock); | |
621a1ee1 NB |
428 | if (fs_info->exclusive_operation == type || |
429 | (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED && | |
430 | type == BTRFS_EXCLOP_DEV_ADD)) | |
578bda9e DS |
431 | return true; |
432 | ||
433 | spin_unlock(&fs_info->super_lock); | |
434 | return false; | |
435 | } | |
436 | ||
437 | void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) | |
438 | { | |
439 | spin_unlock(&fs_info->super_lock); | |
440 | } | |
441 | ||
c3e1f96c GR |
442 | void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) |
443 | { | |
0d7ed32c | 444 | spin_lock(&fs_info->super_lock); |
c3e1f96c | 445 | WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); |
0d7ed32c | 446 | spin_unlock(&fs_info->super_lock); |
66a2823c | 447 | sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); |
c3e1f96c GR |
448 | } |
449 | ||
efc0e69c NB |
450 | void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, |
451 | enum btrfs_exclusive_operation op) | |
452 | { | |
453 | switch (op) { | |
454 | case BTRFS_EXCLOP_BALANCE_PAUSED: | |
455 | spin_lock(&fs_info->super_lock); | |
456 | ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || | |
457 | fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD); | |
458 | fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED; | |
459 | spin_unlock(&fs_info->super_lock); | |
460 | break; | |
461 | case BTRFS_EXCLOP_BALANCE: | |
462 | spin_lock(&fs_info->super_lock); | |
463 | ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED); | |
464 | fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE; | |
465 | spin_unlock(&fs_info->super_lock); | |
466 | break; | |
467 | default: | |
468 | btrfs_warn(fs_info, | |
469 | "invalid exclop balance operation %d requested", op); | |
470 | } | |
471 | } | |
472 | ||
dc408ccd | 473 | static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg) |
6cbff00f | 474 | { |
6cbff00f CH |
475 | return put_user(inode->i_generation, arg); |
476 | } | |
f46b5a66 | 477 | |
b929c1d8 MPS |
478 | static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, |
479 | void __user *arg) | |
f7039b1d | 480 | { |
f7039b1d | 481 | struct btrfs_device *device; |
f7039b1d LD |
482 | struct fstrim_range range; |
483 | u64 minlen = ULLONG_MAX; | |
484 | u64 num_devices = 0; | |
485 | int ret; | |
486 | ||
487 | if (!capable(CAP_SYS_ADMIN)) | |
488 | return -EPERM; | |
489 | ||
1cb3dc3f NA |
490 | /* |
491 | * btrfs_trim_block_group() depends on space cache, which is not | |
492 | * available in zoned filesystem. So, disallow fitrim on a zoned | |
493 | * filesystem for now. | |
494 | */ | |
495 | if (btrfs_is_zoned(fs_info)) | |
496 | return -EOPNOTSUPP; | |
497 | ||
f35f06c3 FM |
498 | /* |
499 | * If the fs is mounted with nologreplay, which requires it to be | |
500 | * mounted in RO mode as well, we can not allow discard on free space | |
501 | * inside block groups, because log trees refer to extents that are not | |
502 | * pinned in a block group's free space cache (pinning the extents is | |
503 | * precisely the first phase of replaying a log tree). | |
504 | */ | |
505 | if (btrfs_test_opt(fs_info, NOLOGREPLAY)) | |
506 | return -EROFS; | |
507 | ||
1f78160c XG |
508 | rcu_read_lock(); |
509 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
510 | dev_list) { | |
7b47ef52 | 511 | if (!device->bdev || !bdev_max_discard_sectors(device->bdev)) |
f7039b1d | 512 | continue; |
7b47ef52 CH |
513 | num_devices++; |
514 | minlen = min_t(u64, bdev_discard_granularity(device->bdev), | |
515 | minlen); | |
f7039b1d | 516 | } |
1f78160c | 517 | rcu_read_unlock(); |
f4c697e6 | 518 | |
f7039b1d LD |
519 | if (!num_devices) |
520 | return -EOPNOTSUPP; | |
f7039b1d LD |
521 | if (copy_from_user(&range, arg, sizeof(range))) |
522 | return -EFAULT; | |
6ba9fc8e QW |
523 | |
524 | /* | |
525 | * NOTE: Don't truncate the range using super->total_bytes. Bytenr of | |
526 | * block group is in the logical address space, which can be any | |
527 | * sectorsize aligned bytenr in the range [0, U64_MAX]. | |
528 | */ | |
529 | if (range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 530 | return -EINVAL; |
f7039b1d LD |
531 | |
532 | range.minlen = max(range.minlen, minlen); | |
2ff7e61e | 533 | ret = btrfs_trim_fs(fs_info, &range); |
f7039b1d LD |
534 | if (ret < 0) |
535 | return ret; | |
536 | ||
537 | if (copy_to_user(arg, &range, sizeof(range))) | |
538 | return -EFAULT; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
e1f60a65 | 543 | int __pure btrfs_is_empty_uuid(u8 *uuid) |
dd5f9615 | 544 | { |
46e0f66a CM |
545 | int i; |
546 | ||
547 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
548 | if (uuid[i]) | |
549 | return 0; | |
550 | } | |
551 | return 1; | |
dd5f9615 SB |
552 | } |
553 | ||
3538d68d OS |
554 | /* |
555 | * Calculate the number of transaction items to reserve for creating a subvolume | |
556 | * or snapshot, not including the inode, directory entries, or parent directory. | |
557 | */ | |
558 | static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit) | |
559 | { | |
560 | /* | |
561 | * 1 to add root block | |
562 | * 1 to add root item | |
563 | * 1 to add root ref | |
564 | * 1 to add root backref | |
565 | * 1 to add UUID item | |
566 | * 1 to add qgroup info | |
567 | * 1 to add qgroup limit | |
568 | * | |
569 | * Ideally the last two would only be accounted if qgroups are enabled, | |
570 | * but that can change between now and the time we would insert them. | |
571 | */ | |
572 | unsigned int num_items = 7; | |
573 | ||
574 | if (inherit) { | |
575 | /* 2 to add qgroup relations for each inherited qgroup */ | |
576 | num_items += 2 * inherit->num_qgroups; | |
577 | } | |
578 | return num_items; | |
579 | } | |
580 | ||
4d4340c9 CB |
581 | static noinline int create_subvol(struct user_namespace *mnt_userns, |
582 | struct inode *dir, struct dentry *dentry, | |
8696c533 | 583 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 584 | { |
0b246afa | 585 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); |
f46b5a66 CH |
586 | struct btrfs_trans_handle *trans; |
587 | struct btrfs_key key; | |
49a3c4d9 | 588 | struct btrfs_root_item *root_item; |
f46b5a66 CH |
589 | struct btrfs_inode_item *inode_item; |
590 | struct extent_buffer *leaf; | |
d5c12070 | 591 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 592 | struct btrfs_root *new_root; |
d5c12070 | 593 | struct btrfs_block_rsv block_rsv; |
95582b00 | 594 | struct timespec64 cur_time = current_time(dir); |
3538d68d OS |
595 | struct btrfs_new_inode_args new_inode_args = { |
596 | .dir = dir, | |
597 | .dentry = dentry, | |
598 | .subvol = true, | |
599 | }; | |
600 | unsigned int trans_num_items; | |
f46b5a66 | 601 | int ret; |
2256e901 | 602 | dev_t anon_dev; |
f46b5a66 | 603 | u64 objectid; |
f46b5a66 | 604 | |
49a3c4d9 DS |
605 | root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); |
606 | if (!root_item) | |
607 | return -ENOMEM; | |
608 | ||
543068a2 | 609 | ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); |
2fbe8c8a | 610 | if (ret) |
2256e901 | 611 | goto out_root_item; |
2dfb1e43 | 612 | |
e09fe2d2 QW |
613 | /* |
614 | * Don't create subvolume whose level is not zero. Or qgroup will be | |
01327610 | 615 | * screwed up since it assumes subvolume qgroup's level to be 0. |
e09fe2d2 | 616 | */ |
49a3c4d9 DS |
617 | if (btrfs_qgroup_level(objectid)) { |
618 | ret = -ENOSPC; | |
2256e901 | 619 | goto out_root_item; |
49a3c4d9 | 620 | } |
e09fe2d2 | 621 | |
2256e901 OS |
622 | ret = get_anon_bdev(&anon_dev); |
623 | if (ret < 0) | |
624 | goto out_root_item; | |
625 | ||
3538d68d OS |
626 | new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir); |
627 | if (!new_inode_args.inode) { | |
a1fd0c35 OS |
628 | ret = -ENOMEM; |
629 | goto out_anon_dev; | |
630 | } | |
3538d68d OS |
631 | ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items); |
632 | if (ret) | |
633 | goto out_inode; | |
634 | trans_num_items += create_subvol_num_items(inherit); | |
a1fd0c35 | 635 | |
d5c12070 | 636 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
3538d68d OS |
637 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
638 | trans_num_items, false); | |
d5c12070 | 639 | if (ret) |
3538d68d | 640 | goto out_new_inode_args; |
d5c12070 MX |
641 | |
642 | trans = btrfs_start_transaction(root, 0); | |
643 | if (IS_ERR(trans)) { | |
644 | ret = PTR_ERR(trans); | |
e85fde51 | 645 | btrfs_subvolume_release_metadata(root, &block_rsv); |
3538d68d | 646 | goto out_new_inode_args; |
d5c12070 MX |
647 | } |
648 | trans->block_rsv = &block_rsv; | |
649 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 650 | |
a9377422 | 651 | ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); |
6f72c7e2 | 652 | if (ret) |
2256e901 | 653 | goto out; |
6f72c7e2 | 654 | |
9631e4cc JB |
655 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, |
656 | BTRFS_NESTING_NORMAL); | |
8e8a1e31 JB |
657 | if (IS_ERR(leaf)) { |
658 | ret = PTR_ERR(leaf); | |
2256e901 | 659 | goto out; |
8e8a1e31 | 660 | } |
f46b5a66 | 661 | |
f46b5a66 CH |
662 | btrfs_mark_buffer_dirty(leaf); |
663 | ||
49a3c4d9 | 664 | inode_item = &root_item->inode; |
3cae210f QW |
665 | btrfs_set_stack_inode_generation(inode_item, 1); |
666 | btrfs_set_stack_inode_size(inode_item, 3); | |
667 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
da17066c | 668 | btrfs_set_stack_inode_nbytes(inode_item, |
0b246afa | 669 | fs_info->nodesize); |
3cae210f | 670 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 671 | |
49a3c4d9 DS |
672 | btrfs_set_root_flags(root_item, 0); |
673 | btrfs_set_root_limit(root_item, 0); | |
3cae210f | 674 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
08fe4db1 | 675 | |
49a3c4d9 DS |
676 | btrfs_set_root_bytenr(root_item, leaf->start); |
677 | btrfs_set_root_generation(root_item, trans->transid); | |
678 | btrfs_set_root_level(root_item, 0); | |
679 | btrfs_set_root_refs(root_item, 1); | |
680 | btrfs_set_root_used(root_item, leaf->len); | |
681 | btrfs_set_root_last_snapshot(root_item, 0); | |
f46b5a66 | 682 | |
49a3c4d9 DS |
683 | btrfs_set_root_generation_v2(root_item, |
684 | btrfs_root_generation(root_item)); | |
807fc790 | 685 | generate_random_guid(root_item->uuid); |
49a3c4d9 DS |
686 | btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); |
687 | btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); | |
688 | root_item->ctime = root_item->otime; | |
689 | btrfs_set_root_ctransid(root_item, trans->transid); | |
690 | btrfs_set_root_otransid(root_item, trans->transid); | |
f46b5a66 | 691 | |
925baedd | 692 | btrfs_tree_unlock(leaf); |
f46b5a66 | 693 | |
69948022 | 694 | btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); |
f46b5a66 CH |
695 | |
696 | key.objectid = objectid; | |
5d4f98a2 | 697 | key.offset = 0; |
962a298f | 698 | key.type = BTRFS_ROOT_ITEM_KEY; |
0b246afa | 699 | ret = btrfs_insert_root(trans, fs_info->tree_root, &key, |
49a3c4d9 | 700 | root_item); |
67addf29 FM |
701 | if (ret) { |
702 | /* | |
703 | * Since we don't abort the transaction in this case, free the | |
704 | * tree block so that we don't leak space and leave the | |
705 | * filesystem in an inconsistent state (an extent item in the | |
7a163608 | 706 | * extent tree with a backreference for a root that does not |
212a58fd | 707 | * exists). |
67addf29 | 708 | */ |
212a58fd | 709 | btrfs_tree_lock(leaf); |
ed25dab3 | 710 | btrfs_clean_tree_block(trans, leaf); |
212a58fd | 711 | btrfs_tree_unlock(leaf); |
7a163608 | 712 | btrfs_free_tree_block(trans, objectid, leaf, 0, 1); |
67addf29 | 713 | free_extent_buffer(leaf); |
2256e901 | 714 | goto out; |
67addf29 FM |
715 | } |
716 | ||
717 | free_extent_buffer(leaf); | |
718 | leaf = NULL; | |
f46b5a66 | 719 | |
2dfb1e43 | 720 | new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); |
79787eaa | 721 | if (IS_ERR(new_root)) { |
79787eaa | 722 | ret = PTR_ERR(new_root); |
66642832 | 723 | btrfs_abort_transaction(trans, ret); |
2256e901 | 724 | goto out; |
79787eaa | 725 | } |
2256e901 | 726 | /* anon_dev is owned by new_root now. */ |
2dfb1e43 | 727 | anon_dev = 0; |
3538d68d OS |
728 | BTRFS_I(new_inode_args.inode)->root = new_root; |
729 | /* ... and new_root is owned by new_inode_args.inode now. */ | |
76dda93c | 730 | |
221581e4 JB |
731 | ret = btrfs_record_root_in_trans(trans, new_root); |
732 | if (ret) { | |
66642832 | 733 | btrfs_abort_transaction(trans, ret); |
2256e901 | 734 | goto out; |
79787eaa | 735 | } |
0660b5af | 736 | |
caae78e0 OS |
737 | ret = btrfs_uuid_tree_add(trans, root_item->uuid, |
738 | BTRFS_UUID_KEY_SUBVOL, objectid); | |
c7e54b51 JB |
739 | if (ret) { |
740 | btrfs_abort_transaction(trans, ret); | |
2256e901 | 741 | goto out; |
c7e54b51 | 742 | } |
52c26179 | 743 | |
caae78e0 | 744 | ret = btrfs_create_new_inode(trans, &new_inode_args); |
c7e54b51 JB |
745 | if (ret) { |
746 | btrfs_abort_transaction(trans, ret); | |
2256e901 | 747 | goto out; |
c7e54b51 | 748 | } |
f46b5a66 | 749 | |
caae78e0 OS |
750 | d_instantiate_new(dentry, new_inode_args.inode); |
751 | new_inode_args.inode = NULL; | |
dd5f9615 | 752 | |
2256e901 | 753 | out: |
d5c12070 MX |
754 | trans->block_rsv = NULL; |
755 | trans->bytes_reserved = 0; | |
e85fde51 | 756 | btrfs_subvolume_release_metadata(root, &block_rsv); |
de6e8200 | 757 | |
1b58ae0e FM |
758 | if (ret) |
759 | btrfs_end_transaction(trans); | |
760 | else | |
761 | ret = btrfs_commit_transaction(trans); | |
3538d68d OS |
762 | out_new_inode_args: |
763 | btrfs_new_inode_args_destroy(&new_inode_args); | |
a1fd0c35 | 764 | out_inode: |
3538d68d | 765 | iput(new_inode_args.inode); |
2256e901 | 766 | out_anon_dev: |
2dfb1e43 QW |
767 | if (anon_dev) |
768 | free_anon_bdev(anon_dev); | |
2256e901 | 769 | out_root_item: |
49a3c4d9 DS |
770 | kfree(root_item); |
771 | return ret; | |
f46b5a66 CH |
772 | } |
773 | ||
e9662f70 | 774 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
9babda9f | 775 | struct dentry *dentry, bool readonly, |
e9662f70 | 776 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 777 | { |
0b246afa | 778 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); |
2e4bfab9 | 779 | struct inode *inode; |
f46b5a66 | 780 | struct btrfs_pending_snapshot *pending_snapshot; |
3538d68d | 781 | unsigned int trans_num_items; |
f46b5a66 | 782 | struct btrfs_trans_handle *trans; |
2e4bfab9 | 783 | int ret; |
f46b5a66 | 784 | |
813febdb JB |
785 | /* We do not support snapshotting right now. */ |
786 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { | |
787 | btrfs_warn(fs_info, | |
788 | "extent tree v2 doesn't support snapshotting yet"); | |
789 | return -EOPNOTSUPP; | |
790 | } | |
791 | ||
92a7cc42 | 792 | if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) |
f46b5a66 CH |
793 | return -EINVAL; |
794 | ||
eede2bf3 OS |
795 | if (atomic_read(&root->nr_swapfiles)) { |
796 | btrfs_warn(fs_info, | |
797 | "cannot snapshot subvolume with active swapfile"); | |
798 | return -ETXTBSY; | |
799 | } | |
800 | ||
23269bf5 | 801 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); |
a1ee7362 DS |
802 | if (!pending_snapshot) |
803 | return -ENOMEM; | |
804 | ||
2dfb1e43 QW |
805 | ret = get_anon_bdev(&pending_snapshot->anon_dev); |
806 | if (ret < 0) | |
807 | goto free_pending; | |
b0c0ea63 | 808 | pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), |
23269bf5 | 809 | GFP_KERNEL); |
8546b570 DS |
810 | pending_snapshot->path = btrfs_alloc_path(); |
811 | if (!pending_snapshot->root_item || !pending_snapshot->path) { | |
b0c0ea63 DS |
812 | ret = -ENOMEM; |
813 | goto free_pending; | |
814 | } | |
815 | ||
66d8f3dd MX |
816 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
817 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 | 818 | /* |
3538d68d OS |
819 | * 1 to add dir item |
820 | * 1 to add dir index | |
821 | * 1 to update parent inode item | |
d5c12070 | 822 | */ |
3538d68d | 823 | trans_num_items = create_subvol_num_items(inherit) + 3; |
d5c12070 | 824 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, |
3538d68d OS |
825 | &pending_snapshot->block_rsv, |
826 | trans_num_items, false); | |
d5c12070 | 827 | if (ret) |
c11fbb6e | 828 | goto free_pending; |
d5c12070 | 829 | |
3de4586c | 830 | pending_snapshot->dentry = dentry; |
f46b5a66 | 831 | pending_snapshot->root = root; |
b83cc969 | 832 | pending_snapshot->readonly = readonly; |
e9662f70 | 833 | pending_snapshot->dir = dir; |
8696c533 | 834 | pending_snapshot->inherit = inherit; |
a22285a6 | 835 | |
d5c12070 | 836 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
837 | if (IS_ERR(trans)) { |
838 | ret = PTR_ERR(trans); | |
839 | goto fail; | |
840 | } | |
841 | ||
28b21c55 | 842 | trans->pending_snapshot = pending_snapshot; |
9babda9f NB |
843 | |
844 | ret = btrfs_commit_transaction(trans); | |
aec8030a | 845 | if (ret) |
c37b2b62 | 846 | goto fail; |
a22285a6 YZ |
847 | |
848 | ret = pending_snapshot->error; | |
849 | if (ret) | |
850 | goto fail; | |
851 | ||
d3797308 CM |
852 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
853 | if (ret) | |
854 | goto fail; | |
855 | ||
2b0143b5 | 856 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
2e4bfab9 YZ |
857 | if (IS_ERR(inode)) { |
858 | ret = PTR_ERR(inode); | |
859 | goto fail; | |
860 | } | |
5662344b | 861 | |
2e4bfab9 YZ |
862 | d_instantiate(dentry, inode); |
863 | ret = 0; | |
2dfb1e43 | 864 | pending_snapshot->anon_dev = 0; |
2e4bfab9 | 865 | fail: |
2dfb1e43 QW |
866 | /* Prevent double freeing of anon_dev */ |
867 | if (ret && pending_snapshot->snap) | |
868 | pending_snapshot->snap->anon_dev = 0; | |
00246528 | 869 | btrfs_put_root(pending_snapshot->snap); |
e85fde51 | 870 | btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); |
b0c0ea63 | 871 | free_pending: |
2dfb1e43 QW |
872 | if (pending_snapshot->anon_dev) |
873 | free_anon_bdev(pending_snapshot->anon_dev); | |
b0c0ea63 | 874 | kfree(pending_snapshot->root_item); |
8546b570 | 875 | btrfs_free_path(pending_snapshot->path); |
a1ee7362 DS |
876 | kfree(pending_snapshot); |
877 | ||
f46b5a66 CH |
878 | return ret; |
879 | } | |
880 | ||
4260f7c7 SW |
881 | /* copy of may_delete in fs/namei.c() |
882 | * Check whether we can remove a link victim from directory dir, check | |
883 | * whether the type of victim is right. | |
884 | * 1. We can't do it if dir is read-only (done in permission()) | |
885 | * 2. We should have write and exec permissions on dir | |
886 | * 3. We can't remove anything from append-only dir | |
887 | * 4. We can't do anything with immutable dir (done in permission()) | |
888 | * 5. If the sticky bit on dir is set we should either | |
889 | * a. be owner of dir, or | |
890 | * b. be owner of victim, or | |
891 | * c. have CAP_FOWNER capability | |
01327610 | 892 | * 6. If the victim is append-only or immutable we can't do anything with |
4260f7c7 SW |
893 | * links pointing to it. |
894 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
895 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
896 | * 9. We can't remove a root or mountpoint. | |
897 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
898 | * nfs_async_unlink(). | |
899 | */ | |
900 | ||
c4ed533b CB |
901 | static int btrfs_may_delete(struct user_namespace *mnt_userns, |
902 | struct inode *dir, struct dentry *victim, int isdir) | |
4260f7c7 SW |
903 | { |
904 | int error; | |
905 | ||
2b0143b5 | 906 | if (d_really_is_negative(victim)) |
4260f7c7 SW |
907 | return -ENOENT; |
908 | ||
2b0143b5 | 909 | BUG_ON(d_inode(victim->d_parent) != dir); |
4fa6b5ec | 910 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 | 911 | |
c4ed533b | 912 | error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); |
4260f7c7 SW |
913 | if (error) |
914 | return error; | |
915 | if (IS_APPEND(dir)) | |
916 | return -EPERM; | |
c4ed533b | 917 | if (check_sticky(mnt_userns, dir, d_inode(victim)) || |
ba73d987 CB |
918 | IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || |
919 | IS_SWAPFILE(d_inode(victim))) | |
4260f7c7 SW |
920 | return -EPERM; |
921 | if (isdir) { | |
e36cb0b8 | 922 | if (!d_is_dir(victim)) |
4260f7c7 SW |
923 | return -ENOTDIR; |
924 | if (IS_ROOT(victim)) | |
925 | return -EBUSY; | |
e36cb0b8 | 926 | } else if (d_is_dir(victim)) |
4260f7c7 SW |
927 | return -EISDIR; |
928 | if (IS_DEADDIR(dir)) | |
929 | return -ENOENT; | |
930 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
931 | return -EBUSY; | |
932 | return 0; | |
933 | } | |
934 | ||
cb8e7090 | 935 | /* copy of may_create in fs/namei.c() */ |
4d4340c9 CB |
936 | static inline int btrfs_may_create(struct user_namespace *mnt_userns, |
937 | struct inode *dir, struct dentry *child) | |
cb8e7090 | 938 | { |
2b0143b5 | 939 | if (d_really_is_positive(child)) |
cb8e7090 CH |
940 | return -EEXIST; |
941 | if (IS_DEADDIR(dir)) | |
942 | return -ENOENT; | |
4d4340c9 | 943 | if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) |
5474bf40 | 944 | return -EOVERFLOW; |
4d4340c9 | 945 | return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); |
cb8e7090 CH |
946 | } |
947 | ||
948 | /* | |
949 | * Create a new subvolume below @parent. This is largely modeled after | |
950 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
951 | * inside this filesystem so it's quite a bit simpler. | |
952 | */ | |
92872094 | 953 | static noinline int btrfs_mksubvol(const struct path *parent, |
4d4340c9 | 954 | struct user_namespace *mnt_userns, |
52f75f4f | 955 | const char *name, int namelen, |
72fd032e | 956 | struct btrfs_root *snap_src, |
9babda9f | 957 | bool readonly, |
8696c533 | 958 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 959 | { |
0b246afa JM |
960 | struct inode *dir = d_inode(parent->dentry); |
961 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); | |
cb8e7090 | 962 | struct dentry *dentry; |
6db75318 | 963 | struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen); |
cb8e7090 CH |
964 | int error; |
965 | ||
00235411 AV |
966 | error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
967 | if (error == -EINTR) | |
968 | return error; | |
cb8e7090 | 969 | |
4d4340c9 | 970 | dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); |
cb8e7090 CH |
971 | error = PTR_ERR(dentry); |
972 | if (IS_ERR(dentry)) | |
973 | goto out_unlock; | |
974 | ||
4d4340c9 | 975 | error = btrfs_may_create(mnt_userns, dir, dentry); |
cb8e7090 | 976 | if (error) |
a874a63e | 977 | goto out_dput; |
cb8e7090 | 978 | |
9c52057c CM |
979 | /* |
980 | * even if this name doesn't exist, we may get hash collisions. | |
981 | * check for them now when we can safely fail | |
982 | */ | |
983 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
e43eec81 | 984 | dir->i_ino, &name_str); |
9c52057c CM |
985 | if (error) |
986 | goto out_dput; | |
987 | ||
0b246afa | 988 | down_read(&fs_info->subvol_sem); |
76dda93c YZ |
989 | |
990 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
991 | goto out_up_read; | |
992 | ||
9babda9f NB |
993 | if (snap_src) |
994 | error = create_snapshot(snap_src, dir, dentry, readonly, inherit); | |
995 | else | |
70dc55f4 | 996 | error = create_subvol(mnt_userns, dir, dentry, inherit); |
9babda9f | 997 | |
76dda93c YZ |
998 | if (!error) |
999 | fsnotify_mkdir(dir, dentry); | |
1000 | out_up_read: | |
0b246afa | 1001 | up_read(&fs_info->subvol_sem); |
cb8e7090 CH |
1002 | out_dput: |
1003 | dput(dentry); | |
1004 | out_unlock: | |
e5d4d75b | 1005 | btrfs_inode_unlock(BTRFS_I(dir), 0); |
cb8e7090 CH |
1006 | return error; |
1007 | } | |
1008 | ||
c11fbb6e | 1009 | static noinline int btrfs_mksnapshot(const struct path *parent, |
4d4340c9 | 1010 | struct user_namespace *mnt_userns, |
c11fbb6e RK |
1011 | const char *name, int namelen, |
1012 | struct btrfs_root *root, | |
1013 | bool readonly, | |
1014 | struct btrfs_qgroup_inherit *inherit) | |
1015 | { | |
1016 | int ret; | |
1017 | bool snapshot_force_cow = false; | |
1018 | ||
1019 | /* | |
1020 | * Force new buffered writes to reserve space even when NOCOW is | |
1021 | * possible. This is to avoid later writeback (running dealloc) to | |
1022 | * fallback to COW mode and unexpectedly fail with ENOSPC. | |
1023 | */ | |
1024 | btrfs_drew_read_lock(&root->snapshot_lock); | |
1025 | ||
f9baa501 | 1026 | ret = btrfs_start_delalloc_snapshot(root, false); |
c11fbb6e RK |
1027 | if (ret) |
1028 | goto out; | |
1029 | ||
1030 | /* | |
1031 | * All previous writes have started writeback in NOCOW mode, so now | |
1032 | * we force future writes to fallback to COW mode during snapshot | |
1033 | * creation. | |
1034 | */ | |
1035 | atomic_inc(&root->snapshot_force_cow); | |
1036 | snapshot_force_cow = true; | |
1037 | ||
1038 | btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); | |
1039 | ||
4d4340c9 | 1040 | ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, |
c11fbb6e RK |
1041 | root, readonly, inherit); |
1042 | out: | |
1043 | if (snapshot_force_cow) | |
1044 | atomic_dec(&root->snapshot_force_cow); | |
1045 | btrfs_drew_read_unlock(&root->snapshot_lock); | |
1046 | return ret; | |
1047 | } | |
1048 | ||
17aaa434 DS |
1049 | /* |
1050 | * Try to start exclusive operation @type or cancel it if it's running. | |
1051 | * | |
1052 | * Return: | |
1053 | * 0 - normal mode, newly claimed op started | |
1054 | * >0 - normal mode, something else is running, | |
1055 | * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space | |
1056 | * ECANCELED - cancel mode, successful cancel | |
1057 | * ENOTCONN - cancel mode, operation not running anymore | |
1058 | */ | |
1059 | static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, | |
1060 | enum btrfs_exclusive_operation type, bool cancel) | |
1061 | { | |
1062 | if (!cancel) { | |
1063 | /* Start normal op */ | |
1064 | if (!btrfs_exclop_start(fs_info, type)) | |
1065 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
1066 | /* Exclusive operation is now claimed */ | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | /* Cancel running op */ | |
1071 | if (btrfs_exclop_start_try_lock(fs_info, type)) { | |
1072 | /* | |
1073 | * This blocks any exclop finish from setting it to NONE, so we | |
1074 | * request cancellation. Either it runs and we will wait for it, | |
1075 | * or it has finished and no waiting will happen. | |
1076 | */ | |
1077 | atomic_inc(&fs_info->reloc_cancel_req); | |
1078 | btrfs_exclop_start_unlock(fs_info); | |
1079 | ||
1080 | if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) | |
1081 | wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, | |
1082 | TASK_INTERRUPTIBLE); | |
1083 | ||
1084 | return -ECANCELED; | |
1085 | } | |
1086 | ||
1087 | /* Something else is running or none */ | |
1088 | return -ENOTCONN; | |
1089 | } | |
1090 | ||
198605a8 | 1091 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1092 | void __user *arg) |
f46b5a66 | 1093 | { |
562d7b15 | 1094 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa JM |
1095 | struct inode *inode = file_inode(file); |
1096 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f46b5a66 CH |
1097 | u64 new_size; |
1098 | u64 old_size; | |
1099 | u64 devid = 1; | |
0b246afa | 1100 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f46b5a66 CH |
1101 | struct btrfs_ioctl_vol_args *vol_args; |
1102 | struct btrfs_trans_handle *trans; | |
1103 | struct btrfs_device *device = NULL; | |
1104 | char *sizestr; | |
9a40f122 | 1105 | char *retptr; |
f46b5a66 CH |
1106 | char *devstr = NULL; |
1107 | int ret = 0; | |
f46b5a66 | 1108 | int mod = 0; |
bb059a37 | 1109 | bool cancel; |
f46b5a66 | 1110 | |
e441d54d CM |
1111 | if (!capable(CAP_SYS_ADMIN)) |
1112 | return -EPERM; | |
1113 | ||
198605a8 MX |
1114 | ret = mnt_want_write_file(file); |
1115 | if (ret) | |
1116 | return ret; | |
1117 | ||
bb059a37 DS |
1118 | /* |
1119 | * Read the arguments before checking exclusivity to be able to | |
1120 | * distinguish regular resize and cancel | |
1121 | */ | |
dae7b665 | 1122 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1123 | if (IS_ERR(vol_args)) { |
1124 | ret = PTR_ERR(vol_args); | |
bb059a37 | 1125 | goto out_drop; |
c9e9f97b | 1126 | } |
5516e595 | 1127 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 1128 | sizestr = vol_args->name; |
bb059a37 DS |
1129 | cancel = (strcmp("cancel", sizestr) == 0); |
1130 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); | |
1131 | if (ret) | |
1132 | goto out_free; | |
1133 | /* Exclusive operation is now claimed */ | |
1134 | ||
f46b5a66 CH |
1135 | devstr = strchr(sizestr, ':'); |
1136 | if (devstr) { | |
f46b5a66 CH |
1137 | sizestr = devstr + 1; |
1138 | *devstr = '\0'; | |
1139 | devstr = vol_args->name; | |
58dfae63 Z |
1140 | ret = kstrtoull(devstr, 10, &devid); |
1141 | if (ret) | |
bb059a37 | 1142 | goto out_finish; |
dfd79829 MX |
1143 | if (!devid) { |
1144 | ret = -EINVAL; | |
bb059a37 | 1145 | goto out_finish; |
dfd79829 | 1146 | } |
0b246afa | 1147 | btrfs_info(fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1148 | } |
dba60f3f | 1149 | |
562d7b15 JB |
1150 | args.devid = devid; |
1151 | device = btrfs_find_device(fs_info->fs_devices, &args); | |
f46b5a66 | 1152 | if (!device) { |
0b246afa JM |
1153 | btrfs_info(fs_info, "resizer unable to find device %llu", |
1154 | devid); | |
dfd79829 | 1155 | ret = -ENODEV; |
bb059a37 | 1156 | goto out_finish; |
f46b5a66 | 1157 | } |
dba60f3f | 1158 | |
ebbede42 | 1159 | if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { |
0b246afa | 1160 | btrfs_info(fs_info, |
efe120a0 | 1161 | "resizer unable to apply on readonly device %llu", |
c1c9ff7c | 1162 | devid); |
dfd79829 | 1163 | ret = -EPERM; |
bb059a37 | 1164 | goto out_finish; |
4e42ae1b LB |
1165 | } |
1166 | ||
f46b5a66 | 1167 | if (!strcmp(sizestr, "max")) |
cda00eba | 1168 | new_size = bdev_nr_bytes(device->bdev); |
f46b5a66 CH |
1169 | else { |
1170 | if (sizestr[0] == '-') { | |
1171 | mod = -1; | |
1172 | sizestr++; | |
1173 | } else if (sizestr[0] == '+') { | |
1174 | mod = 1; | |
1175 | sizestr++; | |
1176 | } | |
9a40f122 GH |
1177 | new_size = memparse(sizestr, &retptr); |
1178 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1179 | ret = -EINVAL; |
bb059a37 | 1180 | goto out_finish; |
f46b5a66 CH |
1181 | } |
1182 | } | |
1183 | ||
401e29c1 | 1184 | if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { |
dfd79829 | 1185 | ret = -EPERM; |
bb059a37 | 1186 | goto out_finish; |
63a212ab SB |
1187 | } |
1188 | ||
7cc8e58d | 1189 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1190 | |
1191 | if (mod < 0) { | |
1192 | if (new_size > old_size) { | |
1193 | ret = -EINVAL; | |
bb059a37 | 1194 | goto out_finish; |
f46b5a66 CH |
1195 | } |
1196 | new_size = old_size - new_size; | |
1197 | } else if (mod > 0) { | |
eb8052e0 | 1198 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1199 | ret = -ERANGE; |
bb059a37 | 1200 | goto out_finish; |
eb8052e0 | 1201 | } |
f46b5a66 CH |
1202 | new_size = old_size + new_size; |
1203 | } | |
1204 | ||
ee22184b | 1205 | if (new_size < SZ_256M) { |
f46b5a66 | 1206 | ret = -EINVAL; |
bb059a37 | 1207 | goto out_finish; |
f46b5a66 | 1208 | } |
cda00eba | 1209 | if (new_size > bdev_nr_bytes(device->bdev)) { |
f46b5a66 | 1210 | ret = -EFBIG; |
bb059a37 | 1211 | goto out_finish; |
f46b5a66 CH |
1212 | } |
1213 | ||
47f08b96 | 1214 | new_size = round_down(new_size, fs_info->sectorsize); |
f46b5a66 | 1215 | |
f46b5a66 | 1216 | if (new_size > old_size) { |
a22285a6 | 1217 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1218 | if (IS_ERR(trans)) { |
1219 | ret = PTR_ERR(trans); | |
bb059a37 | 1220 | goto out_finish; |
98d5dc13 | 1221 | } |
f46b5a66 | 1222 | ret = btrfs_grow_device(trans, device, new_size); |
3a45bb20 | 1223 | btrfs_commit_transaction(trans); |
ece7d20e | 1224 | } else if (new_size < old_size) { |
f46b5a66 | 1225 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1226 | } /* equal, nothing need to do */ |
f46b5a66 | 1227 | |
faf8f7b9 MPS |
1228 | if (ret == 0 && new_size != old_size) |
1229 | btrfs_info_in_rcu(fs_info, | |
1230 | "resize device %s (devid %llu) from %llu to %llu", | |
cb3e217b | 1231 | btrfs_dev_name(device), device->devid, |
faf8f7b9 | 1232 | old_size, new_size); |
bb059a37 DS |
1233 | out_finish: |
1234 | btrfs_exclop_finish(fs_info); | |
c9e9f97b | 1235 | out_free: |
f46b5a66 | 1236 | kfree(vol_args); |
bb059a37 | 1237 | out_drop: |
18f39c41 | 1238 | mnt_drop_write_file(file); |
f46b5a66 CH |
1239 | return ret; |
1240 | } | |
1241 | ||
5d54c67e | 1242 | static noinline int __btrfs_ioctl_snap_create(struct file *file, |
4d4340c9 | 1243 | struct user_namespace *mnt_userns, |
52f75f4f | 1244 | const char *name, unsigned long fd, int subvol, |
5d54c67e | 1245 | bool readonly, |
8696c533 | 1246 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1247 | { |
f46b5a66 | 1248 | int namelen; |
3de4586c | 1249 | int ret = 0; |
f46b5a66 | 1250 | |
325c50e3 JM |
1251 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1252 | return -ENOTDIR; | |
1253 | ||
a874a63e LB |
1254 | ret = mnt_want_write_file(file); |
1255 | if (ret) | |
1256 | goto out; | |
1257 | ||
72fd032e SW |
1258 | namelen = strlen(name); |
1259 | if (strchr(name, '/')) { | |
f46b5a66 | 1260 | ret = -EINVAL; |
a874a63e | 1261 | goto out_drop_write; |
f46b5a66 CH |
1262 | } |
1263 | ||
16780cab CM |
1264 | if (name[0] == '.' && |
1265 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1266 | ret = -EEXIST; | |
a874a63e | 1267 | goto out_drop_write; |
16780cab CM |
1268 | } |
1269 | ||
3de4586c | 1270 | if (subvol) { |
4d4340c9 CB |
1271 | ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, |
1272 | namelen, NULL, readonly, inherit); | |
cb8e7090 | 1273 | } else { |
2903ff01 | 1274 | struct fd src = fdget(fd); |
3de4586c | 1275 | struct inode *src_inode; |
2903ff01 | 1276 | if (!src.file) { |
3de4586c | 1277 | ret = -EINVAL; |
a874a63e | 1278 | goto out_drop_write; |
3de4586c CM |
1279 | } |
1280 | ||
496ad9aa AV |
1281 | src_inode = file_inode(src.file); |
1282 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
c79b4713 | 1283 | btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, |
efe120a0 | 1284 | "Snapshot src from another FS"); |
23ad5b17 | 1285 | ret = -EXDEV; |
4d4340c9 | 1286 | } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { |
d0242061 DS |
1287 | /* |
1288 | * Subvolume creation is not restricted, but snapshots | |
1289 | * are limited to own subvolumes only | |
1290 | */ | |
1291 | ret = -EPERM; | |
ecd18815 | 1292 | } else { |
4d4340c9 CB |
1293 | ret = btrfs_mksnapshot(&file->f_path, mnt_userns, |
1294 | name, namelen, | |
1295 | BTRFS_I(src_inode)->root, | |
1296 | readonly, inherit); | |
3de4586c | 1297 | } |
2903ff01 | 1298 | fdput(src); |
cb8e7090 | 1299 | } |
a874a63e LB |
1300 | out_drop_write: |
1301 | mnt_drop_write_file(file); | |
f46b5a66 | 1302 | out: |
72fd032e SW |
1303 | return ret; |
1304 | } | |
1305 | ||
1306 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1307 | void __user *arg, int subvol) |
72fd032e | 1308 | { |
fa0d2b9b | 1309 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1310 | int ret; |
1311 | ||
325c50e3 JM |
1312 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1313 | return -ENOTDIR; | |
1314 | ||
fa0d2b9b LZ |
1315 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1316 | if (IS_ERR(vol_args)) | |
1317 | return PTR_ERR(vol_args); | |
1318 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1319 | |
4d4340c9 CB |
1320 | ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), |
1321 | vol_args->name, vol_args->fd, subvol, | |
1322 | false, NULL); | |
fdfb1e4f | 1323 | |
fa0d2b9b LZ |
1324 | kfree(vol_args); |
1325 | return ret; | |
1326 | } | |
fdfb1e4f | 1327 | |
fa0d2b9b LZ |
1328 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1329 | void __user *arg, int subvol) | |
1330 | { | |
1331 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1332 | int ret; | |
b83cc969 | 1333 | bool readonly = false; |
6f72c7e2 | 1334 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1335 | |
325c50e3 JM |
1336 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1337 | return -ENOTDIR; | |
1338 | ||
fa0d2b9b LZ |
1339 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1340 | if (IS_ERR(vol_args)) | |
1341 | return PTR_ERR(vol_args); | |
1342 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1343 | |
673990db | 1344 | if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { |
b83cc969 | 1345 | ret = -EOPNOTSUPP; |
c47ca32d | 1346 | goto free_args; |
72fd032e | 1347 | } |
fa0d2b9b | 1348 | |
b83cc969 LZ |
1349 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1350 | readonly = true; | |
6f72c7e2 | 1351 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
5011c5a6 DC |
1352 | u64 nums; |
1353 | ||
1354 | if (vol_args->size < sizeof(*inherit) || | |
1355 | vol_args->size > PAGE_SIZE) { | |
6f72c7e2 | 1356 | ret = -EINVAL; |
c47ca32d | 1357 | goto free_args; |
6f72c7e2 AJ |
1358 | } |
1359 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1360 | if (IS_ERR(inherit)) { | |
1361 | ret = PTR_ERR(inherit); | |
c47ca32d | 1362 | goto free_args; |
6f72c7e2 | 1363 | } |
5011c5a6 DC |
1364 | |
1365 | if (inherit->num_qgroups > PAGE_SIZE || | |
1366 | inherit->num_ref_copies > PAGE_SIZE || | |
1367 | inherit->num_excl_copies > PAGE_SIZE) { | |
1368 | ret = -EINVAL; | |
1369 | goto free_inherit; | |
1370 | } | |
1371 | ||
1372 | nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + | |
1373 | 2 * inherit->num_excl_copies; | |
1374 | if (vol_args->size != struct_size(inherit, qgroups, nums)) { | |
1375 | ret = -EINVAL; | |
1376 | goto free_inherit; | |
1377 | } | |
6f72c7e2 | 1378 | } |
fa0d2b9b | 1379 | |
4d4340c9 CB |
1380 | ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), |
1381 | vol_args->name, vol_args->fd, subvol, | |
1382 | readonly, inherit); | |
c47ca32d DC |
1383 | if (ret) |
1384 | goto free_inherit; | |
c47ca32d | 1385 | free_inherit: |
6f72c7e2 | 1386 | kfree(inherit); |
c47ca32d DC |
1387 | free_args: |
1388 | kfree(vol_args); | |
f46b5a66 CH |
1389 | return ret; |
1390 | } | |
1391 | ||
9ad12305 | 1392 | static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode, |
0caa102d LZ |
1393 | void __user *arg) |
1394 | { | |
0b246afa | 1395 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0caa102d LZ |
1396 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1397 | int ret = 0; | |
1398 | u64 flags = 0; | |
1399 | ||
4a0cc7ca | 1400 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1401 | return -EINVAL; |
1402 | ||
0b246afa | 1403 | down_read(&fs_info->subvol_sem); |
0caa102d LZ |
1404 | if (btrfs_root_readonly(root)) |
1405 | flags |= BTRFS_SUBVOL_RDONLY; | |
0b246afa | 1406 | up_read(&fs_info->subvol_sem); |
0caa102d LZ |
1407 | |
1408 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1409 | ret = -EFAULT; | |
1410 | ||
1411 | return ret; | |
1412 | } | |
1413 | ||
1414 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1415 | void __user *arg) | |
1416 | { | |
496ad9aa | 1417 | struct inode *inode = file_inode(file); |
0b246afa | 1418 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0caa102d LZ |
1419 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1420 | struct btrfs_trans_handle *trans; | |
1421 | u64 root_flags; | |
1422 | u64 flags; | |
1423 | int ret = 0; | |
1424 | ||
39e1674f | 1425 | if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) |
bd60ea0f DS |
1426 | return -EPERM; |
1427 | ||
b9ca0664 LB |
1428 | ret = mnt_want_write_file(file); |
1429 | if (ret) | |
1430 | goto out; | |
0caa102d | 1431 | |
4a0cc7ca | 1432 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
b9ca0664 LB |
1433 | ret = -EINVAL; |
1434 | goto out_drop_write; | |
1435 | } | |
0caa102d | 1436 | |
b9ca0664 LB |
1437 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1438 | ret = -EFAULT; | |
1439 | goto out_drop_write; | |
1440 | } | |
0caa102d | 1441 | |
b9ca0664 LB |
1442 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1443 | ret = -EOPNOTSUPP; | |
1444 | goto out_drop_write; | |
1445 | } | |
0caa102d | 1446 | |
0b246afa | 1447 | down_write(&fs_info->subvol_sem); |
0caa102d LZ |
1448 | |
1449 | /* nothing to do */ | |
1450 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1451 | goto out_drop_sem; |
0caa102d LZ |
1452 | |
1453 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1454 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1455 | btrfs_set_root_flags(&root->root_item, |
1456 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1457 | } else { |
1458 | /* | |
1459 | * Block RO -> RW transition if this subvolume is involved in | |
1460 | * send | |
1461 | */ | |
1462 | spin_lock(&root->root_item_lock); | |
1463 | if (root->send_in_progress == 0) { | |
1464 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1465 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1466 | spin_unlock(&root->root_item_lock); |
1467 | } else { | |
1468 | spin_unlock(&root->root_item_lock); | |
0b246afa JM |
1469 | btrfs_warn(fs_info, |
1470 | "Attempt to set subvolume %llu read-write during send", | |
1471 | root->root_key.objectid); | |
2c686537 DS |
1472 | ret = -EPERM; |
1473 | goto out_drop_sem; | |
1474 | } | |
1475 | } | |
0caa102d LZ |
1476 | |
1477 | trans = btrfs_start_transaction(root, 1); | |
1478 | if (IS_ERR(trans)) { | |
1479 | ret = PTR_ERR(trans); | |
1480 | goto out_reset; | |
1481 | } | |
1482 | ||
0b246afa | 1483 | ret = btrfs_update_root(trans, fs_info->tree_root, |
0caa102d | 1484 | &root->root_key, &root->root_item); |
9417ebc8 NB |
1485 | if (ret < 0) { |
1486 | btrfs_end_transaction(trans); | |
1487 | goto out_reset; | |
1488 | } | |
1489 | ||
1490 | ret = btrfs_commit_transaction(trans); | |
0caa102d | 1491 | |
0caa102d LZ |
1492 | out_reset: |
1493 | if (ret) | |
1494 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1495 | out_drop_sem: |
0b246afa | 1496 | up_write(&fs_info->subvol_sem); |
b9ca0664 LB |
1497 | out_drop_write: |
1498 | mnt_drop_write_file(file); | |
1499 | out: | |
0caa102d LZ |
1500 | return ret; |
1501 | } | |
1502 | ||
ac8e9819 CM |
1503 | static noinline int key_in_sk(struct btrfs_key *key, |
1504 | struct btrfs_ioctl_search_key *sk) | |
1505 | { | |
abc6e134 CM |
1506 | struct btrfs_key test; |
1507 | int ret; | |
1508 | ||
1509 | test.objectid = sk->min_objectid; | |
1510 | test.type = sk->min_type; | |
1511 | test.offset = sk->min_offset; | |
1512 | ||
1513 | ret = btrfs_comp_cpu_keys(key, &test); | |
1514 | if (ret < 0) | |
ac8e9819 | 1515 | return 0; |
abc6e134 CM |
1516 | |
1517 | test.objectid = sk->max_objectid; | |
1518 | test.type = sk->max_type; | |
1519 | test.offset = sk->max_offset; | |
1520 | ||
1521 | ret = btrfs_comp_cpu_keys(key, &test); | |
1522 | if (ret > 0) | |
ac8e9819 CM |
1523 | return 0; |
1524 | return 1; | |
1525 | } | |
1526 | ||
df397565 | 1527 | static noinline int copy_to_sk(struct btrfs_path *path, |
ac8e9819 CM |
1528 | struct btrfs_key *key, |
1529 | struct btrfs_ioctl_search_key *sk, | |
9b6e817d | 1530 | size_t *buf_size, |
ba346b35 | 1531 | char __user *ubuf, |
ac8e9819 CM |
1532 | unsigned long *sk_offset, |
1533 | int *num_found) | |
1534 | { | |
1535 | u64 found_transid; | |
1536 | struct extent_buffer *leaf; | |
1537 | struct btrfs_ioctl_search_header sh; | |
dd81d459 | 1538 | struct btrfs_key test; |
ac8e9819 CM |
1539 | unsigned long item_off; |
1540 | unsigned long item_len; | |
1541 | int nritems; | |
1542 | int i; | |
1543 | int slot; | |
ac8e9819 CM |
1544 | int ret = 0; |
1545 | ||
1546 | leaf = path->nodes[0]; | |
1547 | slot = path->slots[0]; | |
1548 | nritems = btrfs_header_nritems(leaf); | |
1549 | ||
1550 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1551 | i = nritems; | |
1552 | goto advance_key; | |
1553 | } | |
1554 | found_transid = btrfs_header_generation(leaf); | |
1555 | ||
1556 | for (i = slot; i < nritems; i++) { | |
1557 | item_off = btrfs_item_ptr_offset(leaf, i); | |
3212fa14 | 1558 | item_len = btrfs_item_size(leaf, i); |
ac8e9819 | 1559 | |
03b71c6c GP |
1560 | btrfs_item_key_to_cpu(leaf, key, i); |
1561 | if (!key_in_sk(key, sk)) | |
1562 | continue; | |
1563 | ||
9b6e817d | 1564 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
1565 | if (*num_found) { |
1566 | ret = 1; | |
1567 | goto out; | |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * return one empty item back for v1, which does not | |
1572 | * handle -EOVERFLOW | |
1573 | */ | |
1574 | ||
9b6e817d | 1575 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 1576 | item_len = 0; |
8f5f6178 GH |
1577 | ret = -EOVERFLOW; |
1578 | } | |
ac8e9819 | 1579 | |
9b6e817d | 1580 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 1581 | ret = 1; |
25c9bc2e | 1582 | goto out; |
ac8e9819 CM |
1583 | } |
1584 | ||
ac8e9819 CM |
1585 | sh.objectid = key->objectid; |
1586 | sh.offset = key->offset; | |
1587 | sh.type = key->type; | |
1588 | sh.len = item_len; | |
1589 | sh.transid = found_transid; | |
1590 | ||
a48b73ec JB |
1591 | /* |
1592 | * Copy search result header. If we fault then loop again so we | |
1593 | * can fault in the pages and -EFAULT there if there's a | |
1594 | * problem. Otherwise we'll fault and then copy the buffer in | |
1595 | * properly this next time through | |
1596 | */ | |
1597 | if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { | |
1598 | ret = 0; | |
ba346b35 GH |
1599 | goto out; |
1600 | } | |
1601 | ||
ac8e9819 CM |
1602 | *sk_offset += sizeof(sh); |
1603 | ||
1604 | if (item_len) { | |
ba346b35 | 1605 | char __user *up = ubuf + *sk_offset; |
a48b73ec JB |
1606 | /* |
1607 | * Copy the item, same behavior as above, but reset the | |
1608 | * * sk_offset so we copy the full thing again. | |
1609 | */ | |
1610 | if (read_extent_buffer_to_user_nofault(leaf, up, | |
1611 | item_off, item_len)) { | |
1612 | ret = 0; | |
1613 | *sk_offset -= sizeof(sh); | |
ba346b35 GH |
1614 | goto out; |
1615 | } | |
1616 | ||
ac8e9819 | 1617 | *sk_offset += item_len; |
ac8e9819 | 1618 | } |
e2156867 | 1619 | (*num_found)++; |
ac8e9819 | 1620 | |
8f5f6178 GH |
1621 | if (ret) /* -EOVERFLOW from above */ |
1622 | goto out; | |
1623 | ||
25c9bc2e GH |
1624 | if (*num_found >= sk->nr_items) { |
1625 | ret = 1; | |
1626 | goto out; | |
1627 | } | |
ac8e9819 CM |
1628 | } |
1629 | advance_key: | |
abc6e134 | 1630 | ret = 0; |
dd81d459 NA |
1631 | test.objectid = sk->max_objectid; |
1632 | test.type = sk->max_type; | |
1633 | test.offset = sk->max_offset; | |
1634 | if (btrfs_comp_cpu_keys(key, &test) >= 0) | |
1635 | ret = 1; | |
1636 | else if (key->offset < (u64)-1) | |
ac8e9819 | 1637 | key->offset++; |
dd81d459 | 1638 | else if (key->type < (u8)-1) { |
abc6e134 | 1639 | key->offset = 0; |
ac8e9819 | 1640 | key->type++; |
dd81d459 | 1641 | } else if (key->objectid < (u64)-1) { |
abc6e134 CM |
1642 | key->offset = 0; |
1643 | key->type = 0; | |
ac8e9819 | 1644 | key->objectid++; |
abc6e134 CM |
1645 | } else |
1646 | ret = 1; | |
25c9bc2e | 1647 | out: |
ba346b35 GH |
1648 | /* |
1649 | * 0: all items from this leaf copied, continue with next | |
1650 | * 1: * more items can be copied, but unused buffer is too small | |
1651 | * * all items were found | |
1652 | * Either way, it will stops the loop which iterates to the next | |
1653 | * leaf | |
1654 | * -EOVERFLOW: item was to large for buffer | |
1655 | * -EFAULT: could not copy extent buffer back to userspace | |
1656 | */ | |
ac8e9819 CM |
1657 | return ret; |
1658 | } | |
1659 | ||
1660 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 1661 | struct btrfs_ioctl_search_key *sk, |
9b6e817d | 1662 | size_t *buf_size, |
ba346b35 | 1663 | char __user *ubuf) |
ac8e9819 | 1664 | { |
0b246afa | 1665 | struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); |
ac8e9819 CM |
1666 | struct btrfs_root *root; |
1667 | struct btrfs_key key; | |
ac8e9819 | 1668 | struct btrfs_path *path; |
ac8e9819 CM |
1669 | int ret; |
1670 | int num_found = 0; | |
1671 | unsigned long sk_offset = 0; | |
1672 | ||
9b6e817d GH |
1673 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
1674 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 1675 | return -EOVERFLOW; |
9b6e817d | 1676 | } |
12544442 | 1677 | |
ac8e9819 CM |
1678 | path = btrfs_alloc_path(); |
1679 | if (!path) | |
1680 | return -ENOMEM; | |
1681 | ||
1682 | if (sk->tree_id == 0) { | |
1683 | /* search the root of the inode that was passed */ | |
00246528 | 1684 | root = btrfs_grab_root(BTRFS_I(inode)->root); |
ac8e9819 | 1685 | } else { |
56e9357a | 1686 | root = btrfs_get_fs_root(info, sk->tree_id, true); |
ac8e9819 | 1687 | if (IS_ERR(root)) { |
ac8e9819 | 1688 | btrfs_free_path(path); |
ad1e3d56 | 1689 | return PTR_ERR(root); |
ac8e9819 CM |
1690 | } |
1691 | } | |
1692 | ||
1693 | key.objectid = sk->min_objectid; | |
1694 | key.type = sk->min_type; | |
1695 | key.offset = sk->min_offset; | |
1696 | ||
67871254 | 1697 | while (1) { |
bb523b40 | 1698 | ret = -EFAULT; |
18788e34 CM |
1699 | /* |
1700 | * Ensure that the whole user buffer is faulted in at sub-page | |
1701 | * granularity, otherwise the loop may live-lock. | |
1702 | */ | |
1703 | if (fault_in_subpage_writeable(ubuf + sk_offset, | |
1704 | *buf_size - sk_offset)) | |
a48b73ec JB |
1705 | break; |
1706 | ||
6174d3cb | 1707 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
1708 | if (ret != 0) { |
1709 | if (ret > 0) | |
1710 | ret = 0; | |
1711 | goto err; | |
1712 | } | |
df397565 | 1713 | ret = copy_to_sk(path, &key, sk, buf_size, ubuf, |
ac8e9819 | 1714 | &sk_offset, &num_found); |
b3b4aa74 | 1715 | btrfs_release_path(path); |
25c9bc2e | 1716 | if (ret) |
ac8e9819 CM |
1717 | break; |
1718 | ||
1719 | } | |
8f5f6178 GH |
1720 | if (ret > 0) |
1721 | ret = 0; | |
ac8e9819 CM |
1722 | err: |
1723 | sk->nr_items = num_found; | |
00246528 | 1724 | btrfs_put_root(root); |
ac8e9819 CM |
1725 | btrfs_free_path(path); |
1726 | return ret; | |
1727 | } | |
1728 | ||
9ad12305 SK |
1729 | static noinline int btrfs_ioctl_tree_search(struct inode *inode, |
1730 | void __user *argp) | |
ac8e9819 | 1731 | { |
0d031dc4 | 1732 | struct btrfs_ioctl_search_args __user *uargs = argp; |
ba346b35 | 1733 | struct btrfs_ioctl_search_key sk; |
9b6e817d GH |
1734 | int ret; |
1735 | size_t buf_size; | |
ac8e9819 CM |
1736 | |
1737 | if (!capable(CAP_SYS_ADMIN)) | |
1738 | return -EPERM; | |
1739 | ||
ba346b35 GH |
1740 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) |
1741 | return -EFAULT; | |
ac8e9819 | 1742 | |
ba346b35 | 1743 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 1744 | |
ba346b35 | 1745 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
1746 | |
1747 | /* | |
1748 | * In the origin implementation an overflow is handled by returning a | |
1749 | * search header with a len of zero, so reset ret. | |
1750 | */ | |
1751 | if (ret == -EOVERFLOW) | |
1752 | ret = 0; | |
1753 | ||
ba346b35 | 1754 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 1755 | ret = -EFAULT; |
ac8e9819 CM |
1756 | return ret; |
1757 | } | |
1758 | ||
9ad12305 | 1759 | static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode, |
cc68a8a5 GH |
1760 | void __user *argp) |
1761 | { | |
0d031dc4 | 1762 | struct btrfs_ioctl_search_args_v2 __user *uarg = argp; |
cc68a8a5 | 1763 | struct btrfs_ioctl_search_args_v2 args; |
cc68a8a5 GH |
1764 | int ret; |
1765 | size_t buf_size; | |
ee22184b | 1766 | const size_t buf_limit = SZ_16M; |
cc68a8a5 GH |
1767 | |
1768 | if (!capable(CAP_SYS_ADMIN)) | |
1769 | return -EPERM; | |
1770 | ||
1771 | /* copy search header and buffer size */ | |
cc68a8a5 GH |
1772 | if (copy_from_user(&args, uarg, sizeof(args))) |
1773 | return -EFAULT; | |
1774 | ||
1775 | buf_size = args.buf_size; | |
1776 | ||
cc68a8a5 GH |
1777 | /* limit result size to 16MB */ |
1778 | if (buf_size > buf_limit) | |
1779 | buf_size = buf_limit; | |
1780 | ||
cc68a8a5 | 1781 | ret = search_ioctl(inode, &args.key, &buf_size, |
718dc5fa | 1782 | (char __user *)(&uarg->buf[0])); |
cc68a8a5 GH |
1783 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) |
1784 | ret = -EFAULT; | |
1785 | else if (ret == -EOVERFLOW && | |
1786 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
1787 | ret = -EFAULT; | |
1788 | ||
ac8e9819 CM |
1789 | return ret; |
1790 | } | |
1791 | ||
98d377a0 | 1792 | /* |
ac8e9819 CM |
1793 | * Search INODE_REFs to identify path name of 'dirid' directory |
1794 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1795 | */ | |
98d377a0 TH |
1796 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1797 | u64 tree_id, u64 dirid, char *name) | |
1798 | { | |
1799 | struct btrfs_root *root; | |
1800 | struct btrfs_key key; | |
ac8e9819 | 1801 | char *ptr; |
98d377a0 TH |
1802 | int ret = -1; |
1803 | int slot; | |
1804 | int len; | |
1805 | int total_len = 0; | |
1806 | struct btrfs_inode_ref *iref; | |
1807 | struct extent_buffer *l; | |
1808 | struct btrfs_path *path; | |
1809 | ||
1810 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1811 | name[0]='\0'; | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | path = btrfs_alloc_path(); | |
1816 | if (!path) | |
1817 | return -ENOMEM; | |
1818 | ||
c8bcbfbd | 1819 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; |
98d377a0 | 1820 | |
56e9357a | 1821 | root = btrfs_get_fs_root(info, tree_id, true); |
98d377a0 | 1822 | if (IS_ERR(root)) { |
ad1e3d56 | 1823 | ret = PTR_ERR(root); |
88234012 JB |
1824 | root = NULL; |
1825 | goto out; | |
1826 | } | |
98d377a0 TH |
1827 | |
1828 | key.objectid = dirid; | |
1829 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1830 | key.offset = (u64)-1; |
98d377a0 | 1831 | |
67871254 | 1832 | while (1) { |
0ff40a91 | 1833 | ret = btrfs_search_backwards(root, &key, path); |
98d377a0 TH |
1834 | if (ret < 0) |
1835 | goto out; | |
18674c6c | 1836 | else if (ret > 0) { |
0ff40a91 MPS |
1837 | ret = -ENOENT; |
1838 | goto out; | |
18674c6c | 1839 | } |
98d377a0 TH |
1840 | |
1841 | l = path->nodes[0]; | |
1842 | slot = path->slots[0]; | |
98d377a0 | 1843 | |
98d377a0 TH |
1844 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
1845 | len = btrfs_inode_ref_name_len(l, iref); | |
1846 | ptr -= len + 1; | |
1847 | total_len += len + 1; | |
a696cf35 FDBM |
1848 | if (ptr < name) { |
1849 | ret = -ENAMETOOLONG; | |
98d377a0 | 1850 | goto out; |
a696cf35 | 1851 | } |
98d377a0 TH |
1852 | |
1853 | *(ptr + len) = '/'; | |
67871254 | 1854 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
1855 | |
1856 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1857 | break; | |
1858 | ||
b3b4aa74 | 1859 | btrfs_release_path(path); |
98d377a0 | 1860 | key.objectid = key.offset; |
8ad6fcab | 1861 | key.offset = (u64)-1; |
98d377a0 | 1862 | dirid = key.objectid; |
98d377a0 | 1863 | } |
77906a50 | 1864 | memmove(name, ptr, total_len); |
67871254 | 1865 | name[total_len] = '\0'; |
98d377a0 TH |
1866 | ret = 0; |
1867 | out: | |
00246528 | 1868 | btrfs_put_root(root); |
98d377a0 | 1869 | btrfs_free_path(path); |
ac8e9819 CM |
1870 | return ret; |
1871 | } | |
1872 | ||
6623d9a0 CB |
1873 | static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, |
1874 | struct inode *inode, | |
23d0b79d TM |
1875 | struct btrfs_ioctl_ino_lookup_user_args *args) |
1876 | { | |
1877 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
1878 | struct super_block *sb = inode->i_sb; | |
1879 | struct btrfs_key upper_limit = BTRFS_I(inode)->location; | |
1880 | u64 treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1881 | u64 dirid = args->dirid; | |
1882 | unsigned long item_off; | |
1883 | unsigned long item_len; | |
1884 | struct btrfs_inode_ref *iref; | |
1885 | struct btrfs_root_ref *rref; | |
b8a49ae1 | 1886 | struct btrfs_root *root = NULL; |
23d0b79d TM |
1887 | struct btrfs_path *path; |
1888 | struct btrfs_key key, key2; | |
1889 | struct extent_buffer *leaf; | |
1890 | struct inode *temp_inode; | |
1891 | char *ptr; | |
1892 | int slot; | |
1893 | int len; | |
1894 | int total_len = 0; | |
1895 | int ret; | |
1896 | ||
1897 | path = btrfs_alloc_path(); | |
1898 | if (!path) | |
1899 | return -ENOMEM; | |
1900 | ||
1901 | /* | |
1902 | * If the bottom subvolume does not exist directly under upper_limit, | |
1903 | * construct the path in from the bottom up. | |
1904 | */ | |
1905 | if (dirid != upper_limit.objectid) { | |
1906 | ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; | |
1907 | ||
56e9357a | 1908 | root = btrfs_get_fs_root(fs_info, treeid, true); |
23d0b79d TM |
1909 | if (IS_ERR(root)) { |
1910 | ret = PTR_ERR(root); | |
1911 | goto out; | |
1912 | } | |
1913 | ||
1914 | key.objectid = dirid; | |
1915 | key.type = BTRFS_INODE_REF_KEY; | |
1916 | key.offset = (u64)-1; | |
1917 | while (1) { | |
0ff40a91 MPS |
1918 | ret = btrfs_search_backwards(root, &key, path); |
1919 | if (ret < 0) | |
1920 | goto out_put; | |
1921 | else if (ret > 0) { | |
1922 | ret = -ENOENT; | |
b8a49ae1 | 1923 | goto out_put; |
23d0b79d TM |
1924 | } |
1925 | ||
1926 | leaf = path->nodes[0]; | |
1927 | slot = path->slots[0]; | |
23d0b79d TM |
1928 | |
1929 | iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); | |
1930 | len = btrfs_inode_ref_name_len(leaf, iref); | |
1931 | ptr -= len + 1; | |
1932 | total_len += len + 1; | |
1933 | if (ptr < args->path) { | |
1934 | ret = -ENAMETOOLONG; | |
b8a49ae1 | 1935 | goto out_put; |
23d0b79d TM |
1936 | } |
1937 | ||
1938 | *(ptr + len) = '/'; | |
1939 | read_extent_buffer(leaf, ptr, | |
1940 | (unsigned long)(iref + 1), len); | |
1941 | ||
1942 | /* Check the read+exec permission of this directory */ | |
1943 | ret = btrfs_previous_item(root, path, dirid, | |
1944 | BTRFS_INODE_ITEM_KEY); | |
1945 | if (ret < 0) { | |
b8a49ae1 | 1946 | goto out_put; |
23d0b79d TM |
1947 | } else if (ret > 0) { |
1948 | ret = -ENOENT; | |
b8a49ae1 | 1949 | goto out_put; |
23d0b79d TM |
1950 | } |
1951 | ||
1952 | leaf = path->nodes[0]; | |
1953 | slot = path->slots[0]; | |
1954 | btrfs_item_key_to_cpu(leaf, &key2, slot); | |
1955 | if (key2.objectid != dirid) { | |
1956 | ret = -ENOENT; | |
b8a49ae1 | 1957 | goto out_put; |
23d0b79d TM |
1958 | } |
1959 | ||
0202e83f | 1960 | temp_inode = btrfs_iget(sb, key2.objectid, root); |
3ca57bd6 MT |
1961 | if (IS_ERR(temp_inode)) { |
1962 | ret = PTR_ERR(temp_inode); | |
b8a49ae1 | 1963 | goto out_put; |
3ca57bd6 | 1964 | } |
6623d9a0 | 1965 | ret = inode_permission(mnt_userns, temp_inode, |
47291baa | 1966 | MAY_READ | MAY_EXEC); |
23d0b79d TM |
1967 | iput(temp_inode); |
1968 | if (ret) { | |
1969 | ret = -EACCES; | |
b8a49ae1 | 1970 | goto out_put; |
23d0b79d TM |
1971 | } |
1972 | ||
1973 | if (key.offset == upper_limit.objectid) | |
1974 | break; | |
1975 | if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { | |
1976 | ret = -EACCES; | |
b8a49ae1 | 1977 | goto out_put; |
23d0b79d TM |
1978 | } |
1979 | ||
1980 | btrfs_release_path(path); | |
1981 | key.objectid = key.offset; | |
1982 | key.offset = (u64)-1; | |
1983 | dirid = key.objectid; | |
1984 | } | |
1985 | ||
1986 | memmove(args->path, ptr, total_len); | |
1987 | args->path[total_len] = '\0'; | |
00246528 | 1988 | btrfs_put_root(root); |
b8a49ae1 | 1989 | root = NULL; |
23d0b79d TM |
1990 | btrfs_release_path(path); |
1991 | } | |
1992 | ||
1993 | /* Get the bottom subvolume's name from ROOT_REF */ | |
23d0b79d TM |
1994 | key.objectid = treeid; |
1995 | key.type = BTRFS_ROOT_REF_KEY; | |
1996 | key.offset = args->treeid; | |
b8a49ae1 | 1997 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
23d0b79d TM |
1998 | if (ret < 0) { |
1999 | goto out; | |
2000 | } else if (ret > 0) { | |
2001 | ret = -ENOENT; | |
2002 | goto out; | |
2003 | } | |
2004 | ||
2005 | leaf = path->nodes[0]; | |
2006 | slot = path->slots[0]; | |
2007 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2008 | ||
2009 | item_off = btrfs_item_ptr_offset(leaf, slot); | |
3212fa14 | 2010 | item_len = btrfs_item_size(leaf, slot); |
23d0b79d TM |
2011 | /* Check if dirid in ROOT_REF corresponds to passed dirid */ |
2012 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2013 | if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { | |
2014 | ret = -EINVAL; | |
2015 | goto out; | |
2016 | } | |
2017 | ||
2018 | /* Copy subvolume's name */ | |
2019 | item_off += sizeof(struct btrfs_root_ref); | |
2020 | item_len -= sizeof(struct btrfs_root_ref); | |
2021 | read_extent_buffer(leaf, args->name, item_off, item_len); | |
2022 | args->name[item_len] = 0; | |
2023 | ||
b8a49ae1 | 2024 | out_put: |
00246528 | 2025 | btrfs_put_root(root); |
23d0b79d TM |
2026 | out: |
2027 | btrfs_free_path(path); | |
2028 | return ret; | |
2029 | } | |
2030 | ||
dc408ccd | 2031 | static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root, |
ac8e9819 CM |
2032 | void __user *argp) |
2033 | { | |
bece2e82 | 2034 | struct btrfs_ioctl_ino_lookup_args *args; |
01b810b8 | 2035 | int ret = 0; |
ac8e9819 | 2036 | |
2354d08f JL |
2037 | args = memdup_user(argp, sizeof(*args)); |
2038 | if (IS_ERR(args)) | |
2039 | return PTR_ERR(args); | |
c2b96929 | 2040 | |
01b810b8 DS |
2041 | /* |
2042 | * Unprivileged query to obtain the containing subvolume root id. The | |
2043 | * path is reset so it's consistent with btrfs_search_path_in_tree. | |
2044 | */ | |
1b53ac4d | 2045 | if (args->treeid == 0) |
dc408ccd | 2046 | args->treeid = root->root_key.objectid; |
1b53ac4d | 2047 | |
01b810b8 DS |
2048 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
2049 | args->name[0] = 0; | |
2050 | goto out; | |
2051 | } | |
2052 | ||
2053 | if (!capable(CAP_SYS_ADMIN)) { | |
2054 | ret = -EPERM; | |
2055 | goto out; | |
2056 | } | |
2057 | ||
dc408ccd | 2058 | ret = btrfs_search_path_in_tree(root->fs_info, |
ac8e9819 CM |
2059 | args->treeid, args->objectid, |
2060 | args->name); | |
2061 | ||
01b810b8 | 2062 | out: |
ac8e9819 CM |
2063 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
2064 | ret = -EFAULT; | |
2065 | ||
2066 | kfree(args); | |
98d377a0 TH |
2067 | return ret; |
2068 | } | |
2069 | ||
23d0b79d TM |
2070 | /* |
2071 | * Version of ino_lookup ioctl (unprivileged) | |
2072 | * | |
2073 | * The main differences from ino_lookup ioctl are: | |
2074 | * | |
2075 | * 1. Read + Exec permission will be checked using inode_permission() during | |
2076 | * path construction. -EACCES will be returned in case of failure. | |
2077 | * 2. Path construction will be stopped at the inode number which corresponds | |
2078 | * to the fd with which this ioctl is called. If constructed path does not | |
2079 | * exist under fd's inode, -EACCES will be returned. | |
2080 | * 3. The name of bottom subvolume is also searched and filled. | |
2081 | */ | |
2082 | static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) | |
2083 | { | |
2084 | struct btrfs_ioctl_ino_lookup_user_args *args; | |
2085 | struct inode *inode; | |
2086 | int ret; | |
2087 | ||
2088 | args = memdup_user(argp, sizeof(*args)); | |
2089 | if (IS_ERR(args)) | |
2090 | return PTR_ERR(args); | |
2091 | ||
2092 | inode = file_inode(file); | |
2093 | ||
2094 | if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && | |
2095 | BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { | |
2096 | /* | |
2097 | * The subvolume does not exist under fd with which this is | |
2098 | * called | |
2099 | */ | |
2100 | kfree(args); | |
2101 | return -EACCES; | |
2102 | } | |
2103 | ||
6623d9a0 | 2104 | ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); |
23d0b79d TM |
2105 | |
2106 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2107 | ret = -EFAULT; | |
2108 | ||
2109 | kfree(args); | |
2110 | return ret; | |
2111 | } | |
2112 | ||
b64ec075 | 2113 | /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ |
9ad12305 | 2114 | static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp) |
b64ec075 TM |
2115 | { |
2116 | struct btrfs_ioctl_get_subvol_info_args *subvol_info; | |
2117 | struct btrfs_fs_info *fs_info; | |
2118 | struct btrfs_root *root; | |
2119 | struct btrfs_path *path; | |
2120 | struct btrfs_key key; | |
2121 | struct btrfs_root_item *root_item; | |
2122 | struct btrfs_root_ref *rref; | |
2123 | struct extent_buffer *leaf; | |
2124 | unsigned long item_off; | |
2125 | unsigned long item_len; | |
b64ec075 TM |
2126 | int slot; |
2127 | int ret = 0; | |
2128 | ||
2129 | path = btrfs_alloc_path(); | |
2130 | if (!path) | |
2131 | return -ENOMEM; | |
2132 | ||
2133 | subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); | |
2134 | if (!subvol_info) { | |
2135 | btrfs_free_path(path); | |
2136 | return -ENOMEM; | |
2137 | } | |
2138 | ||
b64ec075 TM |
2139 | fs_info = BTRFS_I(inode)->root->fs_info; |
2140 | ||
2141 | /* Get root_item of inode's subvolume */ | |
2142 | key.objectid = BTRFS_I(inode)->root->root_key.objectid; | |
56e9357a | 2143 | root = btrfs_get_fs_root(fs_info, key.objectid, true); |
b64ec075 TM |
2144 | if (IS_ERR(root)) { |
2145 | ret = PTR_ERR(root); | |
04734e84 JB |
2146 | goto out_free; |
2147 | } | |
b64ec075 TM |
2148 | root_item = &root->root_item; |
2149 | ||
2150 | subvol_info->treeid = key.objectid; | |
2151 | ||
2152 | subvol_info->generation = btrfs_root_generation(root_item); | |
2153 | subvol_info->flags = btrfs_root_flags(root_item); | |
2154 | ||
2155 | memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); | |
2156 | memcpy(subvol_info->parent_uuid, root_item->parent_uuid, | |
2157 | BTRFS_UUID_SIZE); | |
2158 | memcpy(subvol_info->received_uuid, root_item->received_uuid, | |
2159 | BTRFS_UUID_SIZE); | |
2160 | ||
2161 | subvol_info->ctransid = btrfs_root_ctransid(root_item); | |
2162 | subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); | |
2163 | subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); | |
2164 | ||
2165 | subvol_info->otransid = btrfs_root_otransid(root_item); | |
2166 | subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); | |
2167 | subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); | |
2168 | ||
2169 | subvol_info->stransid = btrfs_root_stransid(root_item); | |
2170 | subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); | |
2171 | subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); | |
2172 | ||
2173 | subvol_info->rtransid = btrfs_root_rtransid(root_item); | |
2174 | subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); | |
2175 | subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); | |
2176 | ||
2177 | if (key.objectid != BTRFS_FS_TREE_OBJECTID) { | |
2178 | /* Search root tree for ROOT_BACKREF of this subvolume */ | |
b64ec075 TM |
2179 | key.type = BTRFS_ROOT_BACKREF_KEY; |
2180 | key.offset = 0; | |
04734e84 | 2181 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
b64ec075 TM |
2182 | if (ret < 0) { |
2183 | goto out; | |
2184 | } else if (path->slots[0] >= | |
2185 | btrfs_header_nritems(path->nodes[0])) { | |
04734e84 | 2186 | ret = btrfs_next_leaf(fs_info->tree_root, path); |
b64ec075 TM |
2187 | if (ret < 0) { |
2188 | goto out; | |
2189 | } else if (ret > 0) { | |
2190 | ret = -EUCLEAN; | |
2191 | goto out; | |
2192 | } | |
2193 | } | |
2194 | ||
2195 | leaf = path->nodes[0]; | |
2196 | slot = path->slots[0]; | |
2197 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2198 | if (key.objectid == subvol_info->treeid && | |
2199 | key.type == BTRFS_ROOT_BACKREF_KEY) { | |
2200 | subvol_info->parent_id = key.offset; | |
2201 | ||
2202 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2203 | subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); | |
2204 | ||
2205 | item_off = btrfs_item_ptr_offset(leaf, slot) | |
2206 | + sizeof(struct btrfs_root_ref); | |
3212fa14 | 2207 | item_len = btrfs_item_size(leaf, slot) |
b64ec075 TM |
2208 | - sizeof(struct btrfs_root_ref); |
2209 | read_extent_buffer(leaf, subvol_info->name, | |
2210 | item_off, item_len); | |
2211 | } else { | |
2212 | ret = -ENOENT; | |
2213 | goto out; | |
2214 | } | |
2215 | } | |
2216 | ||
013c1c55 AJ |
2217 | btrfs_free_path(path); |
2218 | path = NULL; | |
b64ec075 TM |
2219 | if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) |
2220 | ret = -EFAULT; | |
2221 | ||
2222 | out: | |
00246528 | 2223 | btrfs_put_root(root); |
04734e84 | 2224 | out_free: |
b64ec075 | 2225 | btrfs_free_path(path); |
b091f7fe | 2226 | kfree(subvol_info); |
b64ec075 TM |
2227 | return ret; |
2228 | } | |
2229 | ||
42e4b520 TM |
2230 | /* |
2231 | * Return ROOT_REF information of the subvolume containing this inode | |
2232 | * except the subvolume name. | |
2233 | */ | |
9ad12305 | 2234 | static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root, |
dc408ccd | 2235 | void __user *argp) |
42e4b520 TM |
2236 | { |
2237 | struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; | |
2238 | struct btrfs_root_ref *rref; | |
42e4b520 TM |
2239 | struct btrfs_path *path; |
2240 | struct btrfs_key key; | |
2241 | struct extent_buffer *leaf; | |
42e4b520 TM |
2242 | u64 objectid; |
2243 | int slot; | |
2244 | int ret; | |
2245 | u8 found; | |
2246 | ||
2247 | path = btrfs_alloc_path(); | |
2248 | if (!path) | |
2249 | return -ENOMEM; | |
2250 | ||
2251 | rootrefs = memdup_user(argp, sizeof(*rootrefs)); | |
2252 | if (IS_ERR(rootrefs)) { | |
2253 | btrfs_free_path(path); | |
2254 | return PTR_ERR(rootrefs); | |
2255 | } | |
2256 | ||
9ad12305 | 2257 | objectid = root->root_key.objectid; |
42e4b520 TM |
2258 | key.objectid = objectid; |
2259 | key.type = BTRFS_ROOT_REF_KEY; | |
2260 | key.offset = rootrefs->min_treeid; | |
2261 | found = 0; | |
2262 | ||
9ad12305 | 2263 | root = root->fs_info->tree_root; |
42e4b520 TM |
2264 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2265 | if (ret < 0) { | |
2266 | goto out; | |
2267 | } else if (path->slots[0] >= | |
2268 | btrfs_header_nritems(path->nodes[0])) { | |
2269 | ret = btrfs_next_leaf(root, path); | |
2270 | if (ret < 0) { | |
2271 | goto out; | |
2272 | } else if (ret > 0) { | |
2273 | ret = -EUCLEAN; | |
2274 | goto out; | |
2275 | } | |
2276 | } | |
2277 | while (1) { | |
2278 | leaf = path->nodes[0]; | |
2279 | slot = path->slots[0]; | |
2280 | ||
2281 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2282 | if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { | |
2283 | ret = 0; | |
2284 | goto out; | |
2285 | } | |
2286 | ||
2287 | if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { | |
2288 | ret = -EOVERFLOW; | |
2289 | goto out; | |
2290 | } | |
2291 | ||
2292 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2293 | rootrefs->rootref[found].treeid = key.offset; | |
2294 | rootrefs->rootref[found].dirid = | |
2295 | btrfs_root_ref_dirid(leaf, rref); | |
2296 | found++; | |
2297 | ||
2298 | ret = btrfs_next_item(root, path); | |
2299 | if (ret < 0) { | |
2300 | goto out; | |
2301 | } else if (ret > 0) { | |
2302 | ret = -EUCLEAN; | |
2303 | goto out; | |
2304 | } | |
2305 | } | |
2306 | ||
2307 | out: | |
b740d806 JB |
2308 | btrfs_free_path(path); |
2309 | ||
42e4b520 TM |
2310 | if (!ret || ret == -EOVERFLOW) { |
2311 | rootrefs->num_items = found; | |
2312 | /* update min_treeid for next search */ | |
2313 | if (found) | |
2314 | rootrefs->min_treeid = | |
2315 | rootrefs->rootref[found - 1].treeid + 1; | |
2316 | if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) | |
2317 | ret = -EFAULT; | |
2318 | } | |
2319 | ||
2320 | kfree(rootrefs); | |
42e4b520 TM |
2321 | |
2322 | return ret; | |
2323 | } | |
2324 | ||
76dda93c | 2325 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
949964c9 MPS |
2326 | void __user *arg, |
2327 | bool destroy_v2) | |
76dda93c | 2328 | { |
54563d41 | 2329 | struct dentry *parent = file->f_path.dentry; |
0b246afa | 2330 | struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); |
76dda93c | 2331 | struct dentry *dentry; |
2b0143b5 | 2332 | struct inode *dir = d_inode(parent); |
76dda93c YZ |
2333 | struct inode *inode; |
2334 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2335 | struct btrfs_root *dest = NULL; | |
949964c9 MPS |
2336 | struct btrfs_ioctl_vol_args *vol_args = NULL; |
2337 | struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; | |
c4ed533b | 2338 | struct user_namespace *mnt_userns = file_mnt_user_ns(file); |
949964c9 MPS |
2339 | char *subvol_name, *subvol_name_ptr = NULL; |
2340 | int subvol_namelen; | |
76dda93c | 2341 | int err = 0; |
949964c9 | 2342 | bool destroy_parent = false; |
76dda93c | 2343 | |
813febdb JB |
2344 | /* We don't support snapshots with extent tree v2 yet. */ |
2345 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { | |
2346 | btrfs_err(fs_info, | |
2347 | "extent tree v2 doesn't support snapshot deletion yet"); | |
2348 | return -EOPNOTSUPP; | |
2349 | } | |
2350 | ||
949964c9 MPS |
2351 | if (destroy_v2) { |
2352 | vol_args2 = memdup_user(arg, sizeof(*vol_args2)); | |
2353 | if (IS_ERR(vol_args2)) | |
2354 | return PTR_ERR(vol_args2); | |
325c50e3 | 2355 | |
949964c9 MPS |
2356 | if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { |
2357 | err = -EOPNOTSUPP; | |
2358 | goto out; | |
2359 | } | |
76dda93c | 2360 | |
949964c9 MPS |
2361 | /* |
2362 | * If SPEC_BY_ID is not set, we are looking for the subvolume by | |
2363 | * name, same as v1 currently does. | |
2364 | */ | |
2365 | if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { | |
2366 | vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; | |
2367 | subvol_name = vol_args2->name; | |
2368 | ||
2369 | err = mnt_want_write_file(file); | |
2370 | if (err) | |
2371 | goto out; | |
2372 | } else { | |
aabb34e7 | 2373 | struct inode *old_dir; |
c4ed533b | 2374 | |
949964c9 MPS |
2375 | if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { |
2376 | err = -EINVAL; | |
2377 | goto out; | |
2378 | } | |
2379 | ||
2380 | err = mnt_want_write_file(file); | |
2381 | if (err) | |
2382 | goto out; | |
2383 | ||
2384 | dentry = btrfs_get_dentry(fs_info->sb, | |
2385 | BTRFS_FIRST_FREE_OBJECTID, | |
b307f06d | 2386 | vol_args2->subvolid, 0); |
949964c9 MPS |
2387 | if (IS_ERR(dentry)) { |
2388 | err = PTR_ERR(dentry); | |
2389 | goto out_drop_write; | |
2390 | } | |
2391 | ||
2392 | /* | |
2393 | * Change the default parent since the subvolume being | |
2394 | * deleted can be outside of the current mount point. | |
2395 | */ | |
2396 | parent = btrfs_get_parent(dentry); | |
2397 | ||
2398 | /* | |
2399 | * At this point dentry->d_name can point to '/' if the | |
2400 | * subvolume we want to destroy is outsite of the | |
2401 | * current mount point, so we need to release the | |
2402 | * current dentry and execute the lookup to return a new | |
2403 | * one with ->d_name pointing to the | |
2404 | * <mount point>/subvol_name. | |
2405 | */ | |
2406 | dput(dentry); | |
2407 | if (IS_ERR(parent)) { | |
2408 | err = PTR_ERR(parent); | |
2409 | goto out_drop_write; | |
2410 | } | |
aabb34e7 | 2411 | old_dir = dir; |
949964c9 MPS |
2412 | dir = d_inode(parent); |
2413 | ||
2414 | /* | |
2415 | * If v2 was used with SPEC_BY_ID, a new parent was | |
2416 | * allocated since the subvolume can be outside of the | |
2417 | * current mount point. Later on we need to release this | |
2418 | * new parent dentry. | |
2419 | */ | |
2420 | destroy_parent = true; | |
2421 | ||
aabb34e7 CB |
2422 | /* |
2423 | * On idmapped mounts, deletion via subvolid is | |
2424 | * restricted to subvolumes that are immediate | |
2425 | * ancestors of the inode referenced by the file | |
2426 | * descriptor in the ioctl. Otherwise the idmapping | |
2427 | * could potentially be abused to delete subvolumes | |
2428 | * anywhere in the filesystem the user wouldn't be able | |
2429 | * to delete without an idmapped mount. | |
2430 | */ | |
2431 | if (old_dir != dir && mnt_userns != &init_user_ns) { | |
2432 | err = -EOPNOTSUPP; | |
2433 | goto free_parent; | |
2434 | } | |
2435 | ||
949964c9 MPS |
2436 | subvol_name_ptr = btrfs_get_subvol_name_from_objectid( |
2437 | fs_info, vol_args2->subvolid); | |
2438 | if (IS_ERR(subvol_name_ptr)) { | |
2439 | err = PTR_ERR(subvol_name_ptr); | |
2440 | goto free_parent; | |
2441 | } | |
1a9fd417 | 2442 | /* subvol_name_ptr is already nul terminated */ |
949964c9 MPS |
2443 | subvol_name = (char *)kbasename(subvol_name_ptr); |
2444 | } | |
2445 | } else { | |
2446 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
2447 | if (IS_ERR(vol_args)) | |
2448 | return PTR_ERR(vol_args); | |
2449 | ||
2450 | vol_args->name[BTRFS_PATH_NAME_MAX] = 0; | |
2451 | subvol_name = vol_args->name; | |
2452 | ||
2453 | err = mnt_want_write_file(file); | |
2454 | if (err) | |
2455 | goto out; | |
76dda93c YZ |
2456 | } |
2457 | ||
949964c9 | 2458 | subvol_namelen = strlen(subvol_name); |
76dda93c | 2459 | |
949964c9 MPS |
2460 | if (strchr(subvol_name, '/') || |
2461 | strncmp(subvol_name, "..", subvol_namelen) == 0) { | |
2462 | err = -EINVAL; | |
2463 | goto free_subvol_name; | |
2464 | } | |
2465 | ||
2466 | if (!S_ISDIR(dir->i_mode)) { | |
2467 | err = -ENOTDIR; | |
2468 | goto free_subvol_name; | |
2469 | } | |
521e0546 | 2470 | |
00235411 AV |
2471 | err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
2472 | if (err == -EINTR) | |
949964c9 | 2473 | goto free_subvol_name; |
c4ed533b | 2474 | dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); |
76dda93c YZ |
2475 | if (IS_ERR(dentry)) { |
2476 | err = PTR_ERR(dentry); | |
2477 | goto out_unlock_dir; | |
2478 | } | |
2479 | ||
2b0143b5 | 2480 | if (d_really_is_negative(dentry)) { |
76dda93c YZ |
2481 | err = -ENOENT; |
2482 | goto out_dput; | |
2483 | } | |
2484 | ||
2b0143b5 | 2485 | inode = d_inode(dentry); |
4260f7c7 | 2486 | dest = BTRFS_I(inode)->root; |
67871254 | 2487 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2488 | /* |
2489 | * Regular user. Only allow this with a special mount | |
2490 | * option, when the user has write+exec access to the | |
2491 | * subvol root, and when rmdir(2) would have been | |
2492 | * allowed. | |
2493 | * | |
2494 | * Note that this is _not_ check that the subvol is | |
2495 | * empty or doesn't contain data that we wouldn't | |
2496 | * otherwise be able to delete. | |
2497 | * | |
2498 | * Users who want to delete empty subvols should try | |
2499 | * rmdir(2). | |
2500 | */ | |
2501 | err = -EPERM; | |
0b246afa | 2502 | if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) |
4260f7c7 SW |
2503 | goto out_dput; |
2504 | ||
2505 | /* | |
2506 | * Do not allow deletion if the parent dir is the same | |
2507 | * as the dir to be deleted. That means the ioctl | |
2508 | * must be called on the dentry referencing the root | |
2509 | * of the subvol, not a random directory contained | |
2510 | * within it. | |
2511 | */ | |
2512 | err = -EINVAL; | |
2513 | if (root == dest) | |
2514 | goto out_dput; | |
2515 | ||
c4ed533b | 2516 | err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); |
4260f7c7 SW |
2517 | if (err) |
2518 | goto out_dput; | |
4260f7c7 SW |
2519 | } |
2520 | ||
5c39da5b | 2521 | /* check if subvolume may be deleted by a user */ |
c4ed533b | 2522 | err = btrfs_may_delete(mnt_userns, dir, dentry, 1); |
5c39da5b MX |
2523 | if (err) |
2524 | goto out_dput; | |
2525 | ||
4a0cc7ca | 2526 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2527 | err = -EINVAL; |
2528 | goto out_dput; | |
2529 | } | |
2530 | ||
29b6352b | 2531 | btrfs_inode_lock(BTRFS_I(inode), 0); |
3c4f91e2 | 2532 | err = btrfs_delete_subvolume(BTRFS_I(dir), dentry); |
e5d4d75b | 2533 | btrfs_inode_unlock(BTRFS_I(inode), 0); |
a37d9a17 AG |
2534 | if (!err) |
2535 | d_delete_notify(dir, dentry); | |
fa6ac876 | 2536 | |
76dda93c YZ |
2537 | out_dput: |
2538 | dput(dentry); | |
2539 | out_unlock_dir: | |
e5d4d75b | 2540 | btrfs_inode_unlock(BTRFS_I(dir), 0); |
949964c9 MPS |
2541 | free_subvol_name: |
2542 | kfree(subvol_name_ptr); | |
2543 | free_parent: | |
2544 | if (destroy_parent) | |
2545 | dput(parent); | |
00235411 | 2546 | out_drop_write: |
2a79f17e | 2547 | mnt_drop_write_file(file); |
76dda93c | 2548 | out: |
949964c9 | 2549 | kfree(vol_args2); |
76dda93c YZ |
2550 | kfree(vol_args); |
2551 | return err; | |
2552 | } | |
2553 | ||
1e701a32 | 2554 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2555 | { |
496ad9aa | 2556 | struct inode *inode = file_inode(file); |
f46b5a66 | 2557 | struct btrfs_root *root = BTRFS_I(inode)->root; |
c853a578 | 2558 | struct btrfs_ioctl_defrag_range_args range = {0}; |
c146afad YZ |
2559 | int ret; |
2560 | ||
25122d15 ID |
2561 | ret = mnt_want_write_file(file); |
2562 | if (ret) | |
2563 | return ret; | |
b83cc969 | 2564 | |
25122d15 ID |
2565 | if (btrfs_root_readonly(root)) { |
2566 | ret = -EROFS; | |
2567 | goto out; | |
5ac00add | 2568 | } |
f46b5a66 CH |
2569 | |
2570 | switch (inode->i_mode & S_IFMT) { | |
2571 | case S_IFDIR: | |
e441d54d CM |
2572 | if (!capable(CAP_SYS_ADMIN)) { |
2573 | ret = -EPERM; | |
2574 | goto out; | |
2575 | } | |
de78b51a | 2576 | ret = btrfs_defrag_root(root); |
f46b5a66 CH |
2577 | break; |
2578 | case S_IFREG: | |
616d374e AB |
2579 | /* |
2580 | * Note that this does not check the file descriptor for write | |
2581 | * access. This prevents defragmenting executables that are | |
2582 | * running and allows defrag on files open in read-only mode. | |
2583 | */ | |
2584 | if (!capable(CAP_SYS_ADMIN) && | |
47291baa | 2585 | inode_permission(&init_user_ns, inode, MAY_WRITE)) { |
616d374e | 2586 | ret = -EPERM; |
e441d54d CM |
2587 | goto out; |
2588 | } | |
1e701a32 | 2589 | |
1e701a32 | 2590 | if (argp) { |
c853a578 | 2591 | if (copy_from_user(&range, argp, sizeof(range))) { |
1e701a32 | 2592 | ret = -EFAULT; |
683be16e | 2593 | goto out; |
1e701a32 CM |
2594 | } |
2595 | /* compression requires us to start the IO */ | |
c853a578 GR |
2596 | if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
2597 | range.flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2598 | range.extent_thresh = (u32)-1; | |
1e701a32 CM |
2599 | } |
2600 | } else { | |
2601 | /* the rest are all set to zero by kzalloc */ | |
c853a578 | 2602 | range.len = (u64)-1; |
1e701a32 | 2603 | } |
1ccc2e8a | 2604 | ret = btrfs_defrag_file(file_inode(file), &file->f_ra, |
c853a578 | 2605 | &range, BTRFS_OLDEST_GENERATION, 0); |
4cb5300b CM |
2606 | if (ret > 0) |
2607 | ret = 0; | |
f46b5a66 | 2608 | break; |
8929ecfa YZ |
2609 | default: |
2610 | ret = -EINVAL; | |
f46b5a66 | 2611 | } |
e441d54d | 2612 | out: |
25122d15 | 2613 | mnt_drop_write_file(file); |
e441d54d | 2614 | return ret; |
f46b5a66 CH |
2615 | } |
2616 | ||
2ff7e61e | 2617 | static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) |
f46b5a66 CH |
2618 | { |
2619 | struct btrfs_ioctl_vol_args *vol_args; | |
a174c0a2 | 2620 | bool restore_op = false; |
f46b5a66 CH |
2621 | int ret; |
2622 | ||
e441d54d CM |
2623 | if (!capable(CAP_SYS_ADMIN)) |
2624 | return -EPERM; | |
2625 | ||
914a519b JB |
2626 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { |
2627 | btrfs_err(fs_info, "device add not supported on extent tree v2 yet"); | |
2628 | return -EINVAL; | |
2629 | } | |
2630 | ||
a174c0a2 NB |
2631 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) { |
2632 | if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD)) | |
2633 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2634 | ||
2635 | /* | |
2636 | * We can do the device add because we have a paused balanced, | |
2637 | * change the exclusive op type and remember we should bring | |
2638 | * back the paused balance | |
2639 | */ | |
2640 | fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD; | |
2641 | btrfs_exclop_start_unlock(fs_info); | |
2642 | restore_op = true; | |
2643 | } | |
c9e9f97b | 2644 | |
dae7b665 | 2645 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2646 | if (IS_ERR(vol_args)) { |
2647 | ret = PTR_ERR(vol_args); | |
2648 | goto out; | |
2649 | } | |
f46b5a66 | 2650 | |
5516e595 | 2651 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
2ff7e61e | 2652 | ret = btrfs_init_new_device(fs_info, vol_args->name); |
f46b5a66 | 2653 | |
43d20761 | 2654 | if (!ret) |
0b246afa | 2655 | btrfs_info(fs_info, "disk added %s", vol_args->name); |
43d20761 | 2656 | |
f46b5a66 | 2657 | kfree(vol_args); |
c9e9f97b | 2658 | out: |
a174c0a2 NB |
2659 | if (restore_op) |
2660 | btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); | |
2661 | else | |
2662 | btrfs_exclop_finish(fs_info); | |
f46b5a66 CH |
2663 | return ret; |
2664 | } | |
2665 | ||
6b526ed7 | 2666 | static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) |
f46b5a66 | 2667 | { |
1a15eb72 | 2668 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa JM |
2669 | struct inode *inode = file_inode(file); |
2670 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
6b526ed7 | 2671 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
3fa421de JB |
2672 | struct block_device *bdev = NULL; |
2673 | fmode_t mode; | |
f46b5a66 | 2674 | int ret; |
67ae34b6 | 2675 | bool cancel = false; |
f46b5a66 | 2676 | |
e441d54d CM |
2677 | if (!capable(CAP_SYS_ADMIN)) |
2678 | return -EPERM; | |
2679 | ||
dae7b665 | 2680 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
d815b3f2 DC |
2681 | if (IS_ERR(vol_args)) |
2682 | return PTR_ERR(vol_args); | |
f46b5a66 | 2683 | |
748449cd | 2684 | if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { |
fd4e994b OS |
2685 | ret = -EOPNOTSUPP; |
2686 | goto out; | |
2687 | } | |
1a15eb72 | 2688 | |
67ae34b6 | 2689 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; |
1a15eb72 JB |
2690 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) { |
2691 | args.devid = vol_args->devid; | |
2692 | } else if (!strcmp("cancel", vol_args->name)) { | |
67ae34b6 | 2693 | cancel = true; |
1a15eb72 JB |
2694 | } else { |
2695 | ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); | |
2696 | if (ret) | |
2697 | goto out; | |
2698 | } | |
2699 | ||
2700 | ret = mnt_want_write_file(file); | |
2701 | if (ret) | |
2702 | goto out; | |
f46b5a66 | 2703 | |
67ae34b6 DS |
2704 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, |
2705 | cancel); | |
2706 | if (ret) | |
1a15eb72 | 2707 | goto err_drop; |
183860f6 | 2708 | |
1a15eb72 JB |
2709 | /* Exclusive operation is now claimed */ |
2710 | ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); | |
67ae34b6 | 2711 | |
c3e1f96c | 2712 | btrfs_exclop_finish(fs_info); |
183860f6 | 2713 | |
6b526ed7 | 2714 | if (!ret) { |
735654ea | 2715 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) |
0b246afa | 2716 | btrfs_info(fs_info, "device deleted: id %llu", |
6b526ed7 AJ |
2717 | vol_args->devid); |
2718 | else | |
0b246afa | 2719 | btrfs_info(fs_info, "device deleted: %s", |
6b526ed7 AJ |
2720 | vol_args->name); |
2721 | } | |
c47ca32d | 2722 | err_drop: |
4ac20c70 | 2723 | mnt_drop_write_file(file); |
3fa421de JB |
2724 | if (bdev) |
2725 | blkdev_put(bdev, mode); | |
1a15eb72 JB |
2726 | out: |
2727 | btrfs_put_dev_args_from_path(&args); | |
2728 | kfree(vol_args); | |
f46b5a66 CH |
2729 | return ret; |
2730 | } | |
2731 | ||
da24927b | 2732 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2733 | { |
1a15eb72 | 2734 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa JM |
2735 | struct inode *inode = file_inode(file); |
2736 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f46b5a66 | 2737 | struct btrfs_ioctl_vol_args *vol_args; |
3fa421de JB |
2738 | struct block_device *bdev = NULL; |
2739 | fmode_t mode; | |
f46b5a66 | 2740 | int ret; |
37b45995 | 2741 | bool cancel = false; |
f46b5a66 | 2742 | |
e441d54d CM |
2743 | if (!capable(CAP_SYS_ADMIN)) |
2744 | return -EPERM; | |
2745 | ||
58d7bbf8 | 2746 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1a15eb72 JB |
2747 | if (IS_ERR(vol_args)) |
2748 | return PTR_ERR(vol_args); | |
2749 | ||
58d7bbf8 | 2750 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
1a15eb72 JB |
2751 | if (!strcmp("cancel", vol_args->name)) { |
2752 | cancel = true; | |
2753 | } else { | |
2754 | ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name); | |
2755 | if (ret) | |
2756 | goto out; | |
2757 | } | |
2758 | ||
2759 | ret = mnt_want_write_file(file); | |
2760 | if (ret) | |
2761 | goto out; | |
67ae34b6 DS |
2762 | |
2763 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, | |
2764 | cancel); | |
2765 | if (ret == 0) { | |
1a15eb72 | 2766 | ret = btrfs_rm_device(fs_info, &args, &bdev, &mode); |
67ae34b6 DS |
2767 | if (!ret) |
2768 | btrfs_info(fs_info, "disk deleted %s", vol_args->name); | |
2769 | btrfs_exclop_finish(fs_info); | |
2770 | } | |
183860f6 | 2771 | |
4ac20c70 | 2772 | mnt_drop_write_file(file); |
3fa421de JB |
2773 | if (bdev) |
2774 | blkdev_put(bdev, mode); | |
1a15eb72 JB |
2775 | out: |
2776 | btrfs_put_dev_args_from_path(&args); | |
2777 | kfree(vol_args); | |
f46b5a66 CH |
2778 | return ret; |
2779 | } | |
2780 | ||
2ff7e61e JM |
2781 | static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, |
2782 | void __user *arg) | |
475f6387 | 2783 | { |
027ed2f0 | 2784 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 | 2785 | struct btrfs_device *device; |
0b246afa | 2786 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
137c5418 | 2787 | u64 flags_in; |
027ed2f0 | 2788 | int ret = 0; |
475f6387 | 2789 | |
137c5418 JT |
2790 | fi_args = memdup_user(arg, sizeof(*fi_args)); |
2791 | if (IS_ERR(fi_args)) | |
2792 | return PTR_ERR(fi_args); | |
2793 | ||
2794 | flags_in = fi_args->flags; | |
2795 | memset(fi_args, 0, sizeof(*fi_args)); | |
027ed2f0 | 2796 | |
d03262c7 | 2797 | rcu_read_lock(); |
027ed2f0 | 2798 | fi_args->num_devices = fs_devices->num_devices; |
475f6387 | 2799 | |
d03262c7 | 2800 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2801 | if (device->devid > fi_args->max_id) |
2802 | fi_args->max_id = device->devid; | |
475f6387 | 2803 | } |
d03262c7 | 2804 | rcu_read_unlock(); |
475f6387 | 2805 | |
de37aa51 | 2806 | memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); |
bea7eafd OS |
2807 | fi_args->nodesize = fs_info->nodesize; |
2808 | fi_args->sectorsize = fs_info->sectorsize; | |
2809 | fi_args->clone_alignment = fs_info->sectorsize; | |
80a773fb | 2810 | |
137c5418 JT |
2811 | if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { |
2812 | fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
2813 | fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
2814 | fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; | |
2815 | } | |
2816 | ||
0fb408a5 JT |
2817 | if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { |
2818 | fi_args->generation = fs_info->generation; | |
2819 | fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; | |
2820 | } | |
2821 | ||
49bac897 JT |
2822 | if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { |
2823 | memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, | |
2824 | sizeof(fi_args->metadata_uuid)); | |
2825 | fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; | |
2826 | } | |
2827 | ||
027ed2f0 LZ |
2828 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2829 | ret = -EFAULT; | |
475f6387 | 2830 | |
027ed2f0 LZ |
2831 | kfree(fi_args); |
2832 | return ret; | |
475f6387 JS |
2833 | } |
2834 | ||
2ff7e61e JM |
2835 | static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, |
2836 | void __user *arg) | |
475f6387 | 2837 | { |
562d7b15 | 2838 | BTRFS_DEV_LOOKUP_ARGS(args); |
475f6387 JS |
2839 | struct btrfs_ioctl_dev_info_args *di_args; |
2840 | struct btrfs_device *dev; | |
475f6387 | 2841 | int ret = 0; |
475f6387 | 2842 | |
475f6387 JS |
2843 | di_args = memdup_user(arg, sizeof(*di_args)); |
2844 | if (IS_ERR(di_args)) | |
2845 | return PTR_ERR(di_args); | |
2846 | ||
562d7b15 | 2847 | args.devid = di_args->devid; |
dd5f9615 | 2848 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
562d7b15 | 2849 | args.uuid = di_args->uuid; |
475f6387 | 2850 | |
c5593ca3 | 2851 | rcu_read_lock(); |
562d7b15 | 2852 | dev = btrfs_find_device(fs_info->fs_devices, &args); |
475f6387 JS |
2853 | if (!dev) { |
2854 | ret = -ENODEV; | |
2855 | goto out; | |
2856 | } | |
2857 | ||
2858 | di_args->devid = dev->devid; | |
7cc8e58d MX |
2859 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
2860 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 2861 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
63d5429f AC |
2862 | if (dev->name) |
2863 | strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); | |
2864 | else | |
99ba55ad | 2865 | di_args->path[0] = '\0'; |
475f6387 JS |
2866 | |
2867 | out: | |
c5593ca3 | 2868 | rcu_read_unlock(); |
475f6387 JS |
2869 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2870 | ret = -EFAULT; | |
2871 | ||
2872 | kfree(di_args); | |
2873 | return ret; | |
2874 | } | |
2875 | ||
6ef5ed0d JB |
2876 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2877 | { | |
496ad9aa | 2878 | struct inode *inode = file_inode(file); |
0b246afa | 2879 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
6ef5ed0d JB |
2880 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2881 | struct btrfs_root *new_root; | |
2882 | struct btrfs_dir_item *di; | |
2883 | struct btrfs_trans_handle *trans; | |
2a2b5d62 | 2884 | struct btrfs_path *path = NULL; |
6ef5ed0d | 2885 | struct btrfs_disk_key disk_key; |
6db75318 | 2886 | struct fscrypt_str name = FSTR_INIT("default", 7); |
6ef5ed0d JB |
2887 | u64 objectid = 0; |
2888 | u64 dir_id; | |
3c04ce01 | 2889 | int ret; |
6ef5ed0d JB |
2890 | |
2891 | if (!capable(CAP_SYS_ADMIN)) | |
2892 | return -EPERM; | |
2893 | ||
3c04ce01 MX |
2894 | ret = mnt_want_write_file(file); |
2895 | if (ret) | |
2896 | return ret; | |
2897 | ||
2898 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
2899 | ret = -EFAULT; | |
2900 | goto out; | |
2901 | } | |
6ef5ed0d JB |
2902 | |
2903 | if (!objectid) | |
1cecf579 | 2904 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d | 2905 | |
56e9357a | 2906 | new_root = btrfs_get_fs_root(fs_info, objectid, true); |
3c04ce01 MX |
2907 | if (IS_ERR(new_root)) { |
2908 | ret = PTR_ERR(new_root); | |
2909 | goto out; | |
2910 | } | |
2a2b5d62 JB |
2911 | if (!is_fstree(new_root->root_key.objectid)) { |
2912 | ret = -ENOENT; | |
2913 | goto out_free; | |
2914 | } | |
6ef5ed0d | 2915 | |
6ef5ed0d | 2916 | path = btrfs_alloc_path(); |
3c04ce01 MX |
2917 | if (!path) { |
2918 | ret = -ENOMEM; | |
2a2b5d62 | 2919 | goto out_free; |
3c04ce01 | 2920 | } |
6ef5ed0d JB |
2921 | |
2922 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2923 | if (IS_ERR(trans)) { |
3c04ce01 | 2924 | ret = PTR_ERR(trans); |
2a2b5d62 | 2925 | goto out_free; |
6ef5ed0d JB |
2926 | } |
2927 | ||
0b246afa JM |
2928 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
2929 | di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, | |
e43eec81 | 2930 | dir_id, &name, 1); |
cf1e99a4 | 2931 | if (IS_ERR_OR_NULL(di)) { |
2a2b5d62 | 2932 | btrfs_release_path(path); |
3a45bb20 | 2933 | btrfs_end_transaction(trans); |
0b246afa | 2934 | btrfs_err(fs_info, |
5d163e0e | 2935 | "Umm, you don't have the default diritem, this isn't going to work"); |
3c04ce01 | 2936 | ret = -ENOENT; |
2a2b5d62 | 2937 | goto out_free; |
6ef5ed0d JB |
2938 | } |
2939 | ||
2940 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
2941 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
2942 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2a2b5d62 | 2943 | btrfs_release_path(path); |
6ef5ed0d | 2944 | |
0b246afa | 2945 | btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); |
3a45bb20 | 2946 | btrfs_end_transaction(trans); |
2a2b5d62 | 2947 | out_free: |
00246528 | 2948 | btrfs_put_root(new_root); |
2a2b5d62 | 2949 | btrfs_free_path(path); |
3c04ce01 MX |
2950 | out: |
2951 | mnt_drop_write_file(file); | |
2952 | return ret; | |
6ef5ed0d JB |
2953 | } |
2954 | ||
c065f5b1 SY |
2955 | static void get_block_group_info(struct list_head *groups_list, |
2956 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 | 2957 | { |
32da5386 | 2958 | struct btrfs_block_group *block_group; |
bf5fc093 JB |
2959 | |
2960 | space->total_bytes = 0; | |
2961 | space->used_bytes = 0; | |
2962 | space->flags = 0; | |
2963 | list_for_each_entry(block_group, groups_list, list) { | |
2964 | space->flags = block_group->flags; | |
b3470b5d | 2965 | space->total_bytes += block_group->length; |
bf38be65 | 2966 | space->used_bytes += block_group->used; |
bf5fc093 JB |
2967 | } |
2968 | } | |
2969 | ||
2ff7e61e JM |
2970 | static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, |
2971 | void __user *arg) | |
1406e432 JB |
2972 | { |
2973 | struct btrfs_ioctl_space_args space_args; | |
2974 | struct btrfs_ioctl_space_info space; | |
2975 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 2976 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 2977 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 2978 | struct btrfs_space_info *info; |
315d8e98 CIK |
2979 | static const u64 types[] = { |
2980 | BTRFS_BLOCK_GROUP_DATA, | |
2981 | BTRFS_BLOCK_GROUP_SYSTEM, | |
2982 | BTRFS_BLOCK_GROUP_METADATA, | |
2983 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA | |
2984 | }; | |
bf5fc093 | 2985 | int num_types = 4; |
7fde62bf | 2986 | int alloc_size; |
1406e432 | 2987 | int ret = 0; |
51788b1b | 2988 | u64 slot_count = 0; |
bf5fc093 | 2989 | int i, c; |
1406e432 JB |
2990 | |
2991 | if (copy_from_user(&space_args, | |
2992 | (struct btrfs_ioctl_space_args __user *)arg, | |
2993 | sizeof(space_args))) | |
2994 | return -EFAULT; | |
2995 | ||
bf5fc093 JB |
2996 | for (i = 0; i < num_types; i++) { |
2997 | struct btrfs_space_info *tmp; | |
2998 | ||
2999 | info = NULL; | |
72804905 | 3000 | list_for_each_entry(tmp, &fs_info->space_info, list) { |
bf5fc093 JB |
3001 | if (tmp->flags == types[i]) { |
3002 | info = tmp; | |
3003 | break; | |
3004 | } | |
3005 | } | |
bf5fc093 JB |
3006 | |
3007 | if (!info) | |
3008 | continue; | |
3009 | ||
3010 | down_read(&info->groups_sem); | |
3011 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3012 | if (!list_empty(&info->block_groups[c])) | |
3013 | slot_count++; | |
3014 | } | |
3015 | up_read(&info->groups_sem); | |
3016 | } | |
7fde62bf | 3017 | |
36523e95 DS |
3018 | /* |
3019 | * Global block reserve, exported as a space_info | |
3020 | */ | |
3021 | slot_count++; | |
3022 | ||
7fde62bf CM |
3023 | /* space_slots == 0 means they are asking for a count */ |
3024 | if (space_args.space_slots == 0) { | |
3025 | space_args.total_spaces = slot_count; | |
3026 | goto out; | |
3027 | } | |
bf5fc093 | 3028 | |
51788b1b | 3029 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3030 | |
7fde62bf | 3031 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3032 | |
7fde62bf CM |
3033 | /* we generally have at most 6 or so space infos, one for each raid |
3034 | * level. So, a whole page should be more than enough for everyone | |
3035 | */ | |
09cbfeaf | 3036 | if (alloc_size > PAGE_SIZE) |
7fde62bf CM |
3037 | return -ENOMEM; |
3038 | ||
1406e432 | 3039 | space_args.total_spaces = 0; |
8d2db785 | 3040 | dest = kmalloc(alloc_size, GFP_KERNEL); |
7fde62bf CM |
3041 | if (!dest) |
3042 | return -ENOMEM; | |
3043 | dest_orig = dest; | |
1406e432 | 3044 | |
7fde62bf | 3045 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3046 | for (i = 0; i < num_types; i++) { |
3047 | struct btrfs_space_info *tmp; | |
3048 | ||
51788b1b DR |
3049 | if (!slot_count) |
3050 | break; | |
3051 | ||
bf5fc093 | 3052 | info = NULL; |
72804905 | 3053 | list_for_each_entry(tmp, &fs_info->space_info, list) { |
bf5fc093 JB |
3054 | if (tmp->flags == types[i]) { |
3055 | info = tmp; | |
3056 | break; | |
3057 | } | |
3058 | } | |
7fde62bf | 3059 | |
bf5fc093 JB |
3060 | if (!info) |
3061 | continue; | |
3062 | down_read(&info->groups_sem); | |
3063 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3064 | if (!list_empty(&info->block_groups[c])) { | |
c065f5b1 SY |
3065 | get_block_group_info(&info->block_groups[c], |
3066 | &space); | |
bf5fc093 JB |
3067 | memcpy(dest, &space, sizeof(space)); |
3068 | dest++; | |
3069 | space_args.total_spaces++; | |
51788b1b | 3070 | slot_count--; |
bf5fc093 | 3071 | } |
51788b1b DR |
3072 | if (!slot_count) |
3073 | break; | |
bf5fc093 JB |
3074 | } |
3075 | up_read(&info->groups_sem); | |
1406e432 | 3076 | } |
1406e432 | 3077 | |
36523e95 DS |
3078 | /* |
3079 | * Add global block reserve | |
3080 | */ | |
3081 | if (slot_count) { | |
0b246afa | 3082 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
36523e95 DS |
3083 | |
3084 | spin_lock(&block_rsv->lock); | |
3085 | space.total_bytes = block_rsv->size; | |
3086 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
3087 | spin_unlock(&block_rsv->lock); | |
3088 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
3089 | memcpy(dest, &space, sizeof(space)); | |
3090 | space_args.total_spaces++; | |
3091 | } | |
3092 | ||
2eec6c81 | 3093 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3094 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3095 | ||
3096 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3097 | ret = -EFAULT; | |
3098 | ||
3099 | kfree(dest_orig); | |
3100 | out: | |
3101 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3102 | ret = -EFAULT; |
3103 | ||
3104 | return ret; | |
3105 | } | |
3106 | ||
9a8c28be MX |
3107 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3108 | void __user *argp) | |
46204592 | 3109 | { |
46204592 SW |
3110 | struct btrfs_trans_handle *trans; |
3111 | u64 transid; | |
3112 | ||
d4edf39b | 3113 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
3114 | if (IS_ERR(trans)) { |
3115 | if (PTR_ERR(trans) != -ENOENT) | |
3116 | return PTR_ERR(trans); | |
3117 | ||
3118 | /* No running transaction, don't bother */ | |
3119 | transid = root->fs_info->last_trans_committed; | |
3120 | goto out; | |
3121 | } | |
46204592 | 3122 | transid = trans->transid; |
fdfbf020 | 3123 | btrfs_commit_transaction_async(trans); |
ff7c1d33 | 3124 | out: |
46204592 SW |
3125 | if (argp) |
3126 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3127 | return -EFAULT; | |
3128 | return 0; | |
3129 | } | |
3130 | ||
2ff7e61e | 3131 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, |
9a8c28be | 3132 | void __user *argp) |
46204592 | 3133 | { |
46204592 SW |
3134 | u64 transid; |
3135 | ||
3136 | if (argp) { | |
3137 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3138 | return -EFAULT; | |
3139 | } else { | |
3140 | transid = 0; /* current trans */ | |
3141 | } | |
2ff7e61e | 3142 | return btrfs_wait_for_commit(fs_info, transid); |
46204592 SW |
3143 | } |
3144 | ||
b8e95489 | 3145 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 3146 | { |
0b246afa | 3147 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
475f6387 | 3148 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 3149 | int ret; |
475f6387 JS |
3150 | |
3151 | if (!capable(CAP_SYS_ADMIN)) | |
3152 | return -EPERM; | |
3153 | ||
da32c6d5 JB |
3154 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { |
3155 | btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet"); | |
3156 | return -EINVAL; | |
3157 | } | |
3158 | ||
475f6387 JS |
3159 | sa = memdup_user(arg, sizeof(*sa)); |
3160 | if (IS_ERR(sa)) | |
3161 | return PTR_ERR(sa); | |
3162 | ||
b8e95489 MX |
3163 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
3164 | ret = mnt_want_write_file(file); | |
3165 | if (ret) | |
3166 | goto out; | |
3167 | } | |
3168 | ||
0b246afa | 3169 | ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3170 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3171 | 0); | |
475f6387 | 3172 | |
5afe6ce7 FM |
3173 | /* |
3174 | * Copy scrub args to user space even if btrfs_scrub_dev() returned an | |
3175 | * error. This is important as it allows user space to know how much | |
3176 | * progress scrub has done. For example, if scrub is canceled we get | |
3177 | * -ECANCELED from btrfs_scrub_dev() and return that error back to user | |
3178 | * space. Later user space can inspect the progress from the structure | |
3179 | * btrfs_ioctl_scrub_args and resume scrub from where it left off | |
3180 | * previously (btrfs-progs does this). | |
3181 | * If we fail to copy the btrfs_ioctl_scrub_args structure to user space | |
3182 | * then return -EFAULT to signal the structure was not copied or it may | |
3183 | * be corrupt and unreliable due to a partial copy. | |
3184 | */ | |
3185 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
475f6387 JS |
3186 | ret = -EFAULT; |
3187 | ||
b8e95489 MX |
3188 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
3189 | mnt_drop_write_file(file); | |
3190 | out: | |
475f6387 JS |
3191 | kfree(sa); |
3192 | return ret; | |
3193 | } | |
3194 | ||
2ff7e61e | 3195 | static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) |
475f6387 JS |
3196 | { |
3197 | if (!capable(CAP_SYS_ADMIN)) | |
3198 | return -EPERM; | |
3199 | ||
2ff7e61e | 3200 | return btrfs_scrub_cancel(fs_info); |
475f6387 JS |
3201 | } |
3202 | ||
2ff7e61e | 3203 | static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, |
475f6387 JS |
3204 | void __user *arg) |
3205 | { | |
3206 | struct btrfs_ioctl_scrub_args *sa; | |
3207 | int ret; | |
3208 | ||
3209 | if (!capable(CAP_SYS_ADMIN)) | |
3210 | return -EPERM; | |
3211 | ||
3212 | sa = memdup_user(arg, sizeof(*sa)); | |
3213 | if (IS_ERR(sa)) | |
3214 | return PTR_ERR(sa); | |
3215 | ||
2ff7e61e | 3216 | ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); |
475f6387 | 3217 | |
4fa99b00 | 3218 | if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) |
475f6387 JS |
3219 | ret = -EFAULT; |
3220 | ||
3221 | kfree(sa); | |
3222 | return ret; | |
3223 | } | |
3224 | ||
2ff7e61e | 3225 | static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, |
b27f7c0c | 3226 | void __user *arg) |
c11d2c23 SB |
3227 | { |
3228 | struct btrfs_ioctl_get_dev_stats *sa; | |
3229 | int ret; | |
3230 | ||
c11d2c23 SB |
3231 | sa = memdup_user(arg, sizeof(*sa)); |
3232 | if (IS_ERR(sa)) | |
3233 | return PTR_ERR(sa); | |
3234 | ||
b27f7c0c DS |
3235 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3236 | kfree(sa); | |
3237 | return -EPERM; | |
3238 | } | |
3239 | ||
2ff7e61e | 3240 | ret = btrfs_get_dev_stats(fs_info, sa); |
c11d2c23 | 3241 | |
eee99577 | 3242 | if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) |
c11d2c23 SB |
3243 | ret = -EFAULT; |
3244 | ||
3245 | kfree(sa); | |
3246 | return ret; | |
3247 | } | |
3248 | ||
2ff7e61e JM |
3249 | static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, |
3250 | void __user *arg) | |
3f6bcfbd SB |
3251 | { |
3252 | struct btrfs_ioctl_dev_replace_args *p; | |
3253 | int ret; | |
3254 | ||
3255 | if (!capable(CAP_SYS_ADMIN)) | |
3256 | return -EPERM; | |
3257 | ||
914a519b JB |
3258 | if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) { |
3259 | btrfs_err(fs_info, "device replace not supported on extent tree v2 yet"); | |
3260 | return -EINVAL; | |
3261 | } | |
3262 | ||
3f6bcfbd SB |
3263 | p = memdup_user(arg, sizeof(*p)); |
3264 | if (IS_ERR(p)) | |
3265 | return PTR_ERR(p); | |
3266 | ||
3267 | switch (p->cmd) { | |
3268 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
bc98a42c | 3269 | if (sb_rdonly(fs_info->sb)) { |
adfa97cb ID |
3270 | ret = -EROFS; |
3271 | goto out; | |
3272 | } | |
c3e1f96c | 3273 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { |
e57138b3 | 3274 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd | 3275 | } else { |
2ff7e61e | 3276 | ret = btrfs_dev_replace_by_ioctl(fs_info, p); |
c3e1f96c | 3277 | btrfs_exclop_finish(fs_info); |
3f6bcfbd SB |
3278 | } |
3279 | break; | |
3280 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
0b246afa | 3281 | btrfs_dev_replace_status(fs_info, p); |
3f6bcfbd SB |
3282 | ret = 0; |
3283 | break; | |
3284 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
17d202b9 | 3285 | p->result = btrfs_dev_replace_cancel(fs_info); |
97282031 | 3286 | ret = 0; |
3f6bcfbd SB |
3287 | break; |
3288 | default: | |
3289 | ret = -EINVAL; | |
3290 | break; | |
3291 | } | |
3292 | ||
d3a53286 | 3293 | if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) |
3f6bcfbd | 3294 | ret = -EFAULT; |
adfa97cb | 3295 | out: |
3f6bcfbd SB |
3296 | kfree(p); |
3297 | return ret; | |
3298 | } | |
3299 | ||
d7728c96 JS |
3300 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3301 | { | |
3302 | int ret = 0; | |
3303 | int i; | |
740c3d22 | 3304 | u64 rel_ptr; |
d7728c96 | 3305 | int size; |
806468f8 | 3306 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3307 | struct inode_fs_paths *ipath = NULL; |
3308 | struct btrfs_path *path; | |
3309 | ||
82b22ac8 | 3310 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
3311 | return -EPERM; |
3312 | ||
3313 | path = btrfs_alloc_path(); | |
3314 | if (!path) { | |
3315 | ret = -ENOMEM; | |
3316 | goto out; | |
3317 | } | |
3318 | ||
3319 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3320 | if (IS_ERR(ipa)) { | |
3321 | ret = PTR_ERR(ipa); | |
3322 | ipa = NULL; | |
3323 | goto out; | |
3324 | } | |
3325 | ||
3326 | size = min_t(u32, ipa->size, 4096); | |
3327 | ipath = init_ipath(size, root, path); | |
3328 | if (IS_ERR(ipath)) { | |
3329 | ret = PTR_ERR(ipath); | |
3330 | ipath = NULL; | |
3331 | goto out; | |
3332 | } | |
3333 | ||
3334 | ret = paths_from_inode(ipa->inum, ipath); | |
3335 | if (ret < 0) | |
3336 | goto out; | |
3337 | ||
3338 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3339 | rel_ptr = ipath->fspath->val[i] - |
3340 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3341 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3342 | } |
3343 | ||
8cf96b40 AJ |
3344 | btrfs_free_path(path); |
3345 | path = NULL; | |
718dc5fa OS |
3346 | ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, |
3347 | ipath->fspath, size); | |
d7728c96 JS |
3348 | if (ret) { |
3349 | ret = -EFAULT; | |
3350 | goto out; | |
3351 | } | |
3352 | ||
3353 | out: | |
3354 | btrfs_free_path(path); | |
3355 | free_ipath(ipath); | |
3356 | kfree(ipa); | |
3357 | ||
3358 | return ret; | |
3359 | } | |
3360 | ||
2ff7e61e | 3361 | static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, |
d24a67b2 | 3362 | void __user *arg, int version) |
d7728c96 JS |
3363 | { |
3364 | int ret = 0; | |
3365 | int size; | |
d7728c96 JS |
3366 | struct btrfs_ioctl_logical_ino_args *loi; |
3367 | struct btrfs_data_container *inodes = NULL; | |
3368 | struct btrfs_path *path = NULL; | |
d24a67b2 | 3369 | bool ignore_offset; |
d7728c96 JS |
3370 | |
3371 | if (!capable(CAP_SYS_ADMIN)) | |
3372 | return -EPERM; | |
3373 | ||
3374 | loi = memdup_user(arg, sizeof(*loi)); | |
7b9ea627 SV |
3375 | if (IS_ERR(loi)) |
3376 | return PTR_ERR(loi); | |
d7728c96 | 3377 | |
d24a67b2 ZB |
3378 | if (version == 1) { |
3379 | ignore_offset = false; | |
b115e3bc | 3380 | size = min_t(u32, loi->size, SZ_64K); |
d24a67b2 ZB |
3381 | } else { |
3382 | /* All reserved bits must be 0 for now */ | |
3383 | if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { | |
3384 | ret = -EINVAL; | |
3385 | goto out_loi; | |
3386 | } | |
3387 | /* Only accept flags we have defined so far */ | |
3388 | if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { | |
3389 | ret = -EINVAL; | |
3390 | goto out_loi; | |
3391 | } | |
3392 | ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; | |
b115e3bc | 3393 | size = min_t(u32, loi->size, SZ_16M); |
d24a67b2 ZB |
3394 | } |
3395 | ||
d7728c96 JS |
3396 | inodes = init_data_container(size); |
3397 | if (IS_ERR(inodes)) { | |
3398 | ret = PTR_ERR(inodes); | |
418ffb9e | 3399 | goto out_loi; |
d7728c96 JS |
3400 | } |
3401 | ||
418ffb9e AJ |
3402 | path = btrfs_alloc_path(); |
3403 | if (!path) { | |
3404 | ret = -ENOMEM; | |
3405 | goto out; | |
3406 | } | |
2ff7e61e | 3407 | ret = iterate_inodes_from_logical(loi->logical, fs_info, path, |
e3059ec0 | 3408 | inodes, ignore_offset); |
418ffb9e | 3409 | btrfs_free_path(path); |
df031f07 | 3410 | if (ret == -EINVAL) |
d7728c96 JS |
3411 | ret = -ENOENT; |
3412 | if (ret < 0) | |
3413 | goto out; | |
3414 | ||
718dc5fa OS |
3415 | ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, |
3416 | size); | |
d7728c96 JS |
3417 | if (ret) |
3418 | ret = -EFAULT; | |
3419 | ||
3420 | out: | |
f54de068 | 3421 | kvfree(inodes); |
d24a67b2 | 3422 | out_loi: |
d7728c96 JS |
3423 | kfree(loi); |
3424 | ||
3425 | return ret; | |
3426 | } | |
3427 | ||
008ef096 | 3428 | void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, |
c9e9f97b ID |
3429 | struct btrfs_ioctl_balance_args *bargs) |
3430 | { | |
3431 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3432 | ||
3433 | bargs->flags = bctl->flags; | |
3434 | ||
3009a62f | 3435 | if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) |
837d5b6e ID |
3436 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; |
3437 | if (atomic_read(&fs_info->balance_pause_req)) | |
3438 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3439 | if (atomic_read(&fs_info->balance_cancel_req)) |
3440 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3441 | |
c9e9f97b ID |
3442 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3443 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3444 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce | 3445 | |
008ef096 DS |
3446 | spin_lock(&fs_info->balance_lock); |
3447 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3448 | spin_unlock(&fs_info->balance_lock); | |
c9e9f97b ID |
3449 | } |
3450 | ||
43dd529a | 3451 | /* |
7fb10ed8 NB |
3452 | * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as |
3453 | * required. | |
3454 | * | |
3455 | * @fs_info: the filesystem | |
3456 | * @excl_acquired: ptr to boolean value which is set to false in case balance | |
3457 | * is being resumed | |
3458 | * | |
3459 | * Return 0 on success in which case both fs_info::balance is acquired as well | |
3460 | * as exclusive ops are blocked. In case of failure return an error code. | |
3461 | */ | |
3462 | static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired) | |
3463 | { | |
3464 | int ret; | |
3465 | ||
3466 | /* | |
3467 | * Exclusive operation is locked. Three possibilities: | |
3468 | * (1) some other op is running | |
3469 | * (2) balance is running | |
3470 | * (3) balance is paused -- special case (think resume) | |
3471 | */ | |
3472 | while (1) { | |
3473 | if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { | |
3474 | *excl_acquired = true; | |
3475 | mutex_lock(&fs_info->balance_mutex); | |
3476 | return 0; | |
3477 | } | |
3478 | ||
3479 | mutex_lock(&fs_info->balance_mutex); | |
3480 | if (fs_info->balance_ctl) { | |
3481 | /* This is either (2) or (3) */ | |
3482 | if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { | |
3483 | /* This is (2) */ | |
3484 | ret = -EINPROGRESS; | |
3485 | goto out_failure; | |
3486 | ||
3487 | } else { | |
3488 | mutex_unlock(&fs_info->balance_mutex); | |
3489 | /* | |
3490 | * Lock released to allow other waiters to | |
3491 | * continue, we'll reexamine the status again. | |
3492 | */ | |
3493 | mutex_lock(&fs_info->balance_mutex); | |
3494 | ||
3495 | if (fs_info->balance_ctl && | |
3496 | !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { | |
3497 | /* This is (3) */ | |
3498 | *excl_acquired = false; | |
3499 | return 0; | |
3500 | } | |
3501 | } | |
3502 | } else { | |
3503 | /* This is (1) */ | |
3504 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
3505 | goto out_failure; | |
3506 | } | |
3507 | ||
3508 | mutex_unlock(&fs_info->balance_mutex); | |
3509 | } | |
3510 | ||
3511 | out_failure: | |
3512 | mutex_unlock(&fs_info->balance_mutex); | |
3513 | *excl_acquired = false; | |
3514 | return ret; | |
3515 | } | |
3516 | ||
9ba1f6e4 | 3517 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3518 | { |
496ad9aa | 3519 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
3520 | struct btrfs_fs_info *fs_info = root->fs_info; |
3521 | struct btrfs_ioctl_balance_args *bargs; | |
3522 | struct btrfs_balance_control *bctl; | |
099aa972 | 3523 | bool need_unlock = true; |
c9e9f97b ID |
3524 | int ret; |
3525 | ||
3526 | if (!capable(CAP_SYS_ADMIN)) | |
3527 | return -EPERM; | |
3528 | ||
e54bfa31 | 3529 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3530 | if (ret) |
3531 | return ret; | |
3532 | ||
d8645462 NB |
3533 | bargs = memdup_user(arg, sizeof(*bargs)); |
3534 | if (IS_ERR(bargs)) { | |
3535 | ret = PTR_ERR(bargs); | |
3536 | bargs = NULL; | |
3537 | goto out; | |
3538 | } | |
3539 | ||
099aa972 NB |
3540 | ret = btrfs_try_lock_balance(fs_info, &need_unlock); |
3541 | if (ret) | |
ed0fb78f | 3542 | goto out; |
ed0fb78f | 3543 | |
099aa972 NB |
3544 | lockdep_assert_held(&fs_info->balance_mutex); |
3545 | ||
39864601 NB |
3546 | if (bargs->flags & BTRFS_BALANCE_RESUME) { |
3547 | if (!fs_info->balance_ctl) { | |
3548 | ret = -ENOTCONN; | |
ed0fb78f | 3549 | goto out_unlock; |
c9e9f97b | 3550 | } |
de322263 | 3551 | |
39864601 NB |
3552 | bctl = fs_info->balance_ctl; |
3553 | spin_lock(&fs_info->balance_lock); | |
3554 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
3555 | spin_unlock(&fs_info->balance_lock); | |
3556 | btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE); | |
de322263 | 3557 | |
39864601 | 3558 | goto do_balance; |
c9e9f97b | 3559 | } |
de322263 | 3560 | |
d8645462 NB |
3561 | if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
3562 | ret = -EINVAL; | |
3563 | goto out_unlock; | |
c9e9f97b ID |
3564 | } |
3565 | ||
ed0fb78f | 3566 | if (fs_info->balance_ctl) { |
837d5b6e | 3567 | ret = -EINPROGRESS; |
d8645462 | 3568 | goto out_unlock; |
837d5b6e ID |
3569 | } |
3570 | ||
8d2db785 | 3571 | bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); |
c9e9f97b ID |
3572 | if (!bctl) { |
3573 | ret = -ENOMEM; | |
d8645462 | 3574 | goto out_unlock; |
c9e9f97b ID |
3575 | } |
3576 | ||
39864601 NB |
3577 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); |
3578 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
3579 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
8eb93459 | 3580 | |
39864601 | 3581 | bctl->flags = bargs->flags; |
de322263 | 3582 | do_balance: |
c9e9f97b | 3583 | /* |
c3e1f96c GR |
3584 | * Ownership of bctl and exclusive operation goes to btrfs_balance. |
3585 | * bctl is freed in reset_balance_state, or, if restriper was paused | |
3586 | * all the way until unmount, in free_fs_info. The flag should be | |
3587 | * cleared after reset_balance_state. | |
c9e9f97b | 3588 | */ |
ed0fb78f ID |
3589 | need_unlock = false; |
3590 | ||
6fcf6e2b | 3591 | ret = btrfs_balance(fs_info, bctl, bargs); |
0f89abf5 | 3592 | bctl = NULL; |
ed0fb78f | 3593 | |
39864601 | 3594 | if (ret == 0 || ret == -ECANCELED) { |
c9e9f97b ID |
3595 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
3596 | ret = -EFAULT; | |
3597 | } | |
3598 | ||
0f89abf5 | 3599 | kfree(bctl); |
ed0fb78f | 3600 | out_unlock: |
c9e9f97b | 3601 | mutex_unlock(&fs_info->balance_mutex); |
ed0fb78f | 3602 | if (need_unlock) |
c3e1f96c | 3603 | btrfs_exclop_finish(fs_info); |
ed0fb78f | 3604 | out: |
e54bfa31 | 3605 | mnt_drop_write_file(file); |
d8645462 | 3606 | kfree(bargs); |
c9e9f97b ID |
3607 | return ret; |
3608 | } | |
3609 | ||
2ff7e61e | 3610 | static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) |
837d5b6e ID |
3611 | { |
3612 | if (!capable(CAP_SYS_ADMIN)) | |
3613 | return -EPERM; | |
3614 | ||
3615 | switch (cmd) { | |
3616 | case BTRFS_BALANCE_CTL_PAUSE: | |
0b246afa | 3617 | return btrfs_pause_balance(fs_info); |
a7e99c69 | 3618 | case BTRFS_BALANCE_CTL_CANCEL: |
0b246afa | 3619 | return btrfs_cancel_balance(fs_info); |
837d5b6e ID |
3620 | } |
3621 | ||
3622 | return -EINVAL; | |
3623 | } | |
3624 | ||
2ff7e61e | 3625 | static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, |
19a39dce ID |
3626 | void __user *arg) |
3627 | { | |
19a39dce ID |
3628 | struct btrfs_ioctl_balance_args *bargs; |
3629 | int ret = 0; | |
3630 | ||
3631 | if (!capable(CAP_SYS_ADMIN)) | |
3632 | return -EPERM; | |
3633 | ||
3634 | mutex_lock(&fs_info->balance_mutex); | |
3635 | if (!fs_info->balance_ctl) { | |
3636 | ret = -ENOTCONN; | |
3637 | goto out; | |
3638 | } | |
3639 | ||
8d2db785 | 3640 | bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); |
19a39dce ID |
3641 | if (!bargs) { |
3642 | ret = -ENOMEM; | |
3643 | goto out; | |
3644 | } | |
3645 | ||
008ef096 | 3646 | btrfs_update_ioctl_balance_args(fs_info, bargs); |
19a39dce ID |
3647 | |
3648 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3649 | ret = -EFAULT; | |
3650 | ||
3651 | kfree(bargs); | |
3652 | out: | |
3653 | mutex_unlock(&fs_info->balance_mutex); | |
3654 | return ret; | |
3655 | } | |
3656 | ||
905b0dda | 3657 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 3658 | { |
0b246afa JM |
3659 | struct inode *inode = file_inode(file); |
3660 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5d13a37b | 3661 | struct btrfs_ioctl_quota_ctl_args *sa; |
5d13a37b | 3662 | int ret; |
5d13a37b AJ |
3663 | |
3664 | if (!capable(CAP_SYS_ADMIN)) | |
3665 | return -EPERM; | |
3666 | ||
905b0dda MX |
3667 | ret = mnt_want_write_file(file); |
3668 | if (ret) | |
3669 | return ret; | |
5d13a37b AJ |
3670 | |
3671 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3672 | if (IS_ERR(sa)) { |
3673 | ret = PTR_ERR(sa); | |
3674 | goto drop_write; | |
3675 | } | |
5d13a37b | 3676 | |
0b246afa | 3677 | down_write(&fs_info->subvol_sem); |
5d13a37b AJ |
3678 | |
3679 | switch (sa->cmd) { | |
3680 | case BTRFS_QUOTA_CTL_ENABLE: | |
340f1aa2 | 3681 | ret = btrfs_quota_enable(fs_info); |
5d13a37b AJ |
3682 | break; |
3683 | case BTRFS_QUOTA_CTL_DISABLE: | |
340f1aa2 | 3684 | ret = btrfs_quota_disable(fs_info); |
5d13a37b | 3685 | break; |
5d13a37b AJ |
3686 | default: |
3687 | ret = -EINVAL; | |
3688 | break; | |
3689 | } | |
3690 | ||
5d13a37b | 3691 | kfree(sa); |
0b246afa | 3692 | up_write(&fs_info->subvol_sem); |
905b0dda MX |
3693 | drop_write: |
3694 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3695 | return ret; |
3696 | } | |
3697 | ||
905b0dda | 3698 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 3699 | { |
0b246afa JM |
3700 | struct inode *inode = file_inode(file); |
3701 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
3702 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5d13a37b AJ |
3703 | struct btrfs_ioctl_qgroup_assign_args *sa; |
3704 | struct btrfs_trans_handle *trans; | |
3705 | int ret; | |
3706 | int err; | |
3707 | ||
3708 | if (!capable(CAP_SYS_ADMIN)) | |
3709 | return -EPERM; | |
3710 | ||
905b0dda MX |
3711 | ret = mnt_want_write_file(file); |
3712 | if (ret) | |
3713 | return ret; | |
5d13a37b AJ |
3714 | |
3715 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3716 | if (IS_ERR(sa)) { |
3717 | ret = PTR_ERR(sa); | |
3718 | goto drop_write; | |
3719 | } | |
5d13a37b AJ |
3720 | |
3721 | trans = btrfs_join_transaction(root); | |
3722 | if (IS_ERR(trans)) { | |
3723 | ret = PTR_ERR(trans); | |
3724 | goto out; | |
3725 | } | |
3726 | ||
5d13a37b | 3727 | if (sa->assign) { |
9f8a6ce6 | 3728 | ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); |
5d13a37b | 3729 | } else { |
39616c27 | 3730 | ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); |
5d13a37b AJ |
3731 | } |
3732 | ||
e082f563 | 3733 | /* update qgroup status and info */ |
280f8bd2 | 3734 | err = btrfs_run_qgroups(trans); |
e082f563 | 3735 | if (err < 0) |
0b246afa JM |
3736 | btrfs_handle_fs_error(fs_info, err, |
3737 | "failed to update qgroup status and info"); | |
3a45bb20 | 3738 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
3739 | if (err && !ret) |
3740 | ret = err; | |
3741 | ||
3742 | out: | |
3743 | kfree(sa); | |
905b0dda MX |
3744 | drop_write: |
3745 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3746 | return ret; |
3747 | } | |
3748 | ||
905b0dda | 3749 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 3750 | { |
0b246afa | 3751 | struct inode *inode = file_inode(file); |
0b246afa | 3752 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
3753 | struct btrfs_ioctl_qgroup_create_args *sa; |
3754 | struct btrfs_trans_handle *trans; | |
3755 | int ret; | |
3756 | int err; | |
3757 | ||
3758 | if (!capable(CAP_SYS_ADMIN)) | |
3759 | return -EPERM; | |
3760 | ||
905b0dda MX |
3761 | ret = mnt_want_write_file(file); |
3762 | if (ret) | |
3763 | return ret; | |
5d13a37b AJ |
3764 | |
3765 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3766 | if (IS_ERR(sa)) { |
3767 | ret = PTR_ERR(sa); | |
3768 | goto drop_write; | |
3769 | } | |
5d13a37b | 3770 | |
d86e56cf MX |
3771 | if (!sa->qgroupid) { |
3772 | ret = -EINVAL; | |
3773 | goto out; | |
3774 | } | |
3775 | ||
5d13a37b AJ |
3776 | trans = btrfs_join_transaction(root); |
3777 | if (IS_ERR(trans)) { | |
3778 | ret = PTR_ERR(trans); | |
3779 | goto out; | |
3780 | } | |
3781 | ||
5d13a37b | 3782 | if (sa->create) { |
49a05ecd | 3783 | ret = btrfs_create_qgroup(trans, sa->qgroupid); |
5d13a37b | 3784 | } else { |
3efbee1d | 3785 | ret = btrfs_remove_qgroup(trans, sa->qgroupid); |
5d13a37b AJ |
3786 | } |
3787 | ||
3a45bb20 | 3788 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
3789 | if (err && !ret) |
3790 | ret = err; | |
3791 | ||
3792 | out: | |
3793 | kfree(sa); | |
905b0dda MX |
3794 | drop_write: |
3795 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3796 | return ret; |
3797 | } | |
3798 | ||
905b0dda | 3799 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 3800 | { |
0b246afa | 3801 | struct inode *inode = file_inode(file); |
0b246afa | 3802 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
3803 | struct btrfs_ioctl_qgroup_limit_args *sa; |
3804 | struct btrfs_trans_handle *trans; | |
3805 | int ret; | |
3806 | int err; | |
3807 | u64 qgroupid; | |
3808 | ||
3809 | if (!capable(CAP_SYS_ADMIN)) | |
3810 | return -EPERM; | |
3811 | ||
905b0dda MX |
3812 | ret = mnt_want_write_file(file); |
3813 | if (ret) | |
3814 | return ret; | |
5d13a37b AJ |
3815 | |
3816 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
3817 | if (IS_ERR(sa)) { |
3818 | ret = PTR_ERR(sa); | |
3819 | goto drop_write; | |
3820 | } | |
5d13a37b AJ |
3821 | |
3822 | trans = btrfs_join_transaction(root); | |
3823 | if (IS_ERR(trans)) { | |
3824 | ret = PTR_ERR(trans); | |
3825 | goto out; | |
3826 | } | |
3827 | ||
3828 | qgroupid = sa->qgroupid; | |
3829 | if (!qgroupid) { | |
3830 | /* take the current subvol as qgroup */ | |
3831 | qgroupid = root->root_key.objectid; | |
3832 | } | |
3833 | ||
f0042d5e | 3834 | ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); |
5d13a37b | 3835 | |
3a45bb20 | 3836 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
3837 | if (err && !ret) |
3838 | ret = err; | |
3839 | ||
3840 | out: | |
3841 | kfree(sa); | |
905b0dda MX |
3842 | drop_write: |
3843 | mnt_drop_write_file(file); | |
5d13a37b AJ |
3844 | return ret; |
3845 | } | |
3846 | ||
2f232036 JS |
3847 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
3848 | { | |
0b246afa JM |
3849 | struct inode *inode = file_inode(file); |
3850 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
2f232036 JS |
3851 | struct btrfs_ioctl_quota_rescan_args *qsa; |
3852 | int ret; | |
3853 | ||
3854 | if (!capable(CAP_SYS_ADMIN)) | |
3855 | return -EPERM; | |
3856 | ||
3857 | ret = mnt_want_write_file(file); | |
3858 | if (ret) | |
3859 | return ret; | |
3860 | ||
3861 | qsa = memdup_user(arg, sizeof(*qsa)); | |
3862 | if (IS_ERR(qsa)) { | |
3863 | ret = PTR_ERR(qsa); | |
3864 | goto drop_write; | |
3865 | } | |
3866 | ||
3867 | if (qsa->flags) { | |
3868 | ret = -EINVAL; | |
3869 | goto out; | |
3870 | } | |
3871 | ||
0b246afa | 3872 | ret = btrfs_qgroup_rescan(fs_info); |
2f232036 JS |
3873 | |
3874 | out: | |
3875 | kfree(qsa); | |
3876 | drop_write: | |
3877 | mnt_drop_write_file(file); | |
3878 | return ret; | |
3879 | } | |
3880 | ||
b929c1d8 MPS |
3881 | static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, |
3882 | void __user *arg) | |
2f232036 | 3883 | { |
0afb603a | 3884 | struct btrfs_ioctl_quota_rescan_args qsa = {0}; |
2f232036 JS |
3885 | |
3886 | if (!capable(CAP_SYS_ADMIN)) | |
3887 | return -EPERM; | |
3888 | ||
0b246afa | 3889 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { |
0afb603a GR |
3890 | qsa.flags = 1; |
3891 | qsa.progress = fs_info->qgroup_rescan_progress.objectid; | |
2f232036 JS |
3892 | } |
3893 | ||
0afb603a | 3894 | if (copy_to_user(arg, &qsa, sizeof(qsa))) |
991a3dae | 3895 | return -EFAULT; |
2f232036 | 3896 | |
991a3dae | 3897 | return 0; |
2f232036 JS |
3898 | } |
3899 | ||
b929c1d8 MPS |
3900 | static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, |
3901 | void __user *arg) | |
57254b6e | 3902 | { |
57254b6e JS |
3903 | if (!capable(CAP_SYS_ADMIN)) |
3904 | return -EPERM; | |
3905 | ||
0b246afa | 3906 | return btrfs_qgroup_wait_for_completion(fs_info, true); |
57254b6e JS |
3907 | } |
3908 | ||
abccd00f | 3909 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
e4fed17a | 3910 | struct user_namespace *mnt_userns, |
abccd00f | 3911 | struct btrfs_ioctl_received_subvol_args *sa) |
8ea05e3a | 3912 | { |
496ad9aa | 3913 | struct inode *inode = file_inode(file); |
0b246afa | 3914 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
8ea05e3a AB |
3915 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3916 | struct btrfs_root_item *root_item = &root->root_item; | |
3917 | struct btrfs_trans_handle *trans; | |
95582b00 | 3918 | struct timespec64 ct = current_time(inode); |
8ea05e3a | 3919 | int ret = 0; |
dd5f9615 | 3920 | int received_uuid_changed; |
8ea05e3a | 3921 | |
e4fed17a | 3922 | if (!inode_owner_or_capable(mnt_userns, inode)) |
bd60ea0f DS |
3923 | return -EPERM; |
3924 | ||
8ea05e3a AB |
3925 | ret = mnt_want_write_file(file); |
3926 | if (ret < 0) | |
3927 | return ret; | |
3928 | ||
0b246afa | 3929 | down_write(&fs_info->subvol_sem); |
8ea05e3a | 3930 | |
4a0cc7ca | 3931 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
8ea05e3a AB |
3932 | ret = -EINVAL; |
3933 | goto out; | |
3934 | } | |
3935 | ||
3936 | if (btrfs_root_readonly(root)) { | |
3937 | ret = -EROFS; | |
3938 | goto out; | |
3939 | } | |
3940 | ||
dd5f9615 SB |
3941 | /* |
3942 | * 1 - root item | |
3943 | * 2 - uuid items (received uuid + subvol uuid) | |
3944 | */ | |
3945 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
3946 | if (IS_ERR(trans)) { |
3947 | ret = PTR_ERR(trans); | |
3948 | trans = NULL; | |
3949 | goto out; | |
3950 | } | |
3951 | ||
3952 | sa->rtransid = trans->transid; | |
3953 | sa->rtime.sec = ct.tv_sec; | |
3954 | sa->rtime.nsec = ct.tv_nsec; | |
3955 | ||
dd5f9615 SB |
3956 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
3957 | BTRFS_UUID_SIZE); | |
3958 | if (received_uuid_changed && | |
d87ff758 | 3959 | !btrfs_is_empty_uuid(root_item->received_uuid)) { |
d1957791 | 3960 | ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, |
d87ff758 NB |
3961 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
3962 | root->root_key.objectid); | |
3963 | if (ret && ret != -ENOENT) { | |
3964 | btrfs_abort_transaction(trans, ret); | |
3965 | btrfs_end_transaction(trans); | |
3966 | goto out; | |
3967 | } | |
3968 | } | |
8ea05e3a AB |
3969 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
3970 | btrfs_set_root_stransid(root_item, sa->stransid); | |
3971 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
3972 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
3973 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
3974 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
3975 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a | 3976 | |
0b246afa | 3977 | ret = btrfs_update_root(trans, fs_info->tree_root, |
8ea05e3a AB |
3978 | &root->root_key, &root->root_item); |
3979 | if (ret < 0) { | |
3a45bb20 | 3980 | btrfs_end_transaction(trans); |
8ea05e3a | 3981 | goto out; |
dd5f9615 SB |
3982 | } |
3983 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
cdb345a8 | 3984 | ret = btrfs_uuid_tree_add(trans, sa->uuid, |
dd5f9615 SB |
3985 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
3986 | root->root_key.objectid); | |
3987 | if (ret < 0 && ret != -EEXIST) { | |
66642832 | 3988 | btrfs_abort_transaction(trans, ret); |
efd38150 | 3989 | btrfs_end_transaction(trans); |
8ea05e3a | 3990 | goto out; |
dd5f9615 SB |
3991 | } |
3992 | } | |
3a45bb20 | 3993 | ret = btrfs_commit_transaction(trans); |
abccd00f | 3994 | out: |
0b246afa | 3995 | up_write(&fs_info->subvol_sem); |
abccd00f HM |
3996 | mnt_drop_write_file(file); |
3997 | return ret; | |
3998 | } | |
3999 | ||
4000 | #ifdef CONFIG_64BIT | |
4001 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
4002 | void __user *arg) | |
4003 | { | |
4004 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
4005 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
4006 | int ret = 0; | |
4007 | ||
4008 | args32 = memdup_user(arg, sizeof(*args32)); | |
7b9ea627 SV |
4009 | if (IS_ERR(args32)) |
4010 | return PTR_ERR(args32); | |
abccd00f | 4011 | |
8d2db785 | 4012 | args64 = kmalloc(sizeof(*args64), GFP_KERNEL); |
84dbeb87 DC |
4013 | if (!args64) { |
4014 | ret = -ENOMEM; | |
abccd00f HM |
4015 | goto out; |
4016 | } | |
4017 | ||
4018 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
4019 | args64->stransid = args32->stransid; | |
4020 | args64->rtransid = args32->rtransid; | |
4021 | args64->stime.sec = args32->stime.sec; | |
4022 | args64->stime.nsec = args32->stime.nsec; | |
4023 | args64->rtime.sec = args32->rtime.sec; | |
4024 | args64->rtime.nsec = args32->rtime.nsec; | |
4025 | args64->flags = args32->flags; | |
4026 | ||
e4fed17a | 4027 | ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); |
abccd00f HM |
4028 | if (ret) |
4029 | goto out; | |
4030 | ||
4031 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
4032 | args32->stransid = args64->stransid; | |
4033 | args32->rtransid = args64->rtransid; | |
4034 | args32->stime.sec = args64->stime.sec; | |
4035 | args32->stime.nsec = args64->stime.nsec; | |
4036 | args32->rtime.sec = args64->rtime.sec; | |
4037 | args32->rtime.nsec = args64->rtime.nsec; | |
4038 | args32->flags = args64->flags; | |
4039 | ||
4040 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
4041 | if (ret) | |
4042 | ret = -EFAULT; | |
4043 | ||
4044 | out: | |
4045 | kfree(args32); | |
4046 | kfree(args64); | |
4047 | return ret; | |
4048 | } | |
4049 | #endif | |
4050 | ||
4051 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
4052 | void __user *arg) | |
4053 | { | |
4054 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
4055 | int ret = 0; | |
4056 | ||
4057 | sa = memdup_user(arg, sizeof(*sa)); | |
7b9ea627 SV |
4058 | if (IS_ERR(sa)) |
4059 | return PTR_ERR(sa); | |
abccd00f | 4060 | |
e4fed17a | 4061 | ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); |
abccd00f HM |
4062 | |
4063 | if (ret) | |
4064 | goto out; | |
4065 | ||
8ea05e3a AB |
4066 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
4067 | if (ret) | |
4068 | ret = -EFAULT; | |
4069 | ||
4070 | out: | |
4071 | kfree(sa); | |
8ea05e3a AB |
4072 | return ret; |
4073 | } | |
4074 | ||
b929c1d8 MPS |
4075 | static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, |
4076 | void __user *arg) | |
867ab667 | 4077 | { |
a1b83ac5 | 4078 | size_t len; |
867ab667 | 4079 | int ret; |
a1b83ac5 AJ |
4080 | char label[BTRFS_LABEL_SIZE]; |
4081 | ||
0b246afa JM |
4082 | spin_lock(&fs_info->super_lock); |
4083 | memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
4084 | spin_unlock(&fs_info->super_lock); | |
a1b83ac5 AJ |
4085 | |
4086 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 4087 | |
4088 | if (len == BTRFS_LABEL_SIZE) { | |
0b246afa JM |
4089 | btrfs_warn(fs_info, |
4090 | "label is too long, return the first %zu bytes", | |
4091 | --len); | |
867ab667 | 4092 | } |
4093 | ||
867ab667 | 4094 | ret = copy_to_user(arg, label, len); |
867ab667 | 4095 | |
4096 | return ret ? -EFAULT : 0; | |
4097 | } | |
4098 | ||
a8bfd4ab | 4099 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
4100 | { | |
0b246afa JM |
4101 | struct inode *inode = file_inode(file); |
4102 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4103 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4104 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
a8bfd4ab | 4105 | struct btrfs_trans_handle *trans; |
4106 | char label[BTRFS_LABEL_SIZE]; | |
4107 | int ret; | |
4108 | ||
4109 | if (!capable(CAP_SYS_ADMIN)) | |
4110 | return -EPERM; | |
4111 | ||
4112 | if (copy_from_user(label, arg, sizeof(label))) | |
4113 | return -EFAULT; | |
4114 | ||
4115 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
0b246afa | 4116 | btrfs_err(fs_info, |
5d163e0e JM |
4117 | "unable to set label with more than %d bytes", |
4118 | BTRFS_LABEL_SIZE - 1); | |
a8bfd4ab | 4119 | return -EINVAL; |
4120 | } | |
4121 | ||
4122 | ret = mnt_want_write_file(file); | |
4123 | if (ret) | |
4124 | return ret; | |
4125 | ||
a8bfd4ab | 4126 | trans = btrfs_start_transaction(root, 0); |
4127 | if (IS_ERR(trans)) { | |
4128 | ret = PTR_ERR(trans); | |
4129 | goto out_unlock; | |
4130 | } | |
4131 | ||
0b246afa | 4132 | spin_lock(&fs_info->super_lock); |
a8bfd4ab | 4133 | strcpy(super_block->label, label); |
0b246afa | 4134 | spin_unlock(&fs_info->super_lock); |
3a45bb20 | 4135 | ret = btrfs_commit_transaction(trans); |
a8bfd4ab | 4136 | |
4137 | out_unlock: | |
a8bfd4ab | 4138 | mnt_drop_write_file(file); |
4139 | return ret; | |
4140 | } | |
4141 | ||
2eaa055f JM |
4142 | #define INIT_FEATURE_FLAGS(suffix) \ |
4143 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
4144 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
4145 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
4146 | ||
d5131b65 | 4147 | int btrfs_ioctl_get_supported_features(void __user *arg) |
2eaa055f | 4148 | { |
4d4ab6d6 | 4149 | static const struct btrfs_ioctl_feature_flags features[3] = { |
2eaa055f JM |
4150 | INIT_FEATURE_FLAGS(SUPP), |
4151 | INIT_FEATURE_FLAGS(SAFE_SET), | |
4152 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
4153 | }; | |
4154 | ||
4155 | if (copy_to_user(arg, &features, sizeof(features))) | |
4156 | return -EFAULT; | |
4157 | ||
4158 | return 0; | |
4159 | } | |
4160 | ||
b929c1d8 MPS |
4161 | static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, |
4162 | void __user *arg) | |
2eaa055f | 4163 | { |
0b246afa | 4164 | struct btrfs_super_block *super_block = fs_info->super_copy; |
2eaa055f JM |
4165 | struct btrfs_ioctl_feature_flags features; |
4166 | ||
4167 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
4168 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
4169 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
4170 | ||
4171 | if (copy_to_user(arg, &features, sizeof(features))) | |
4172 | return -EFAULT; | |
4173 | ||
4174 | return 0; | |
4175 | } | |
4176 | ||
2ff7e61e | 4177 | static int check_feature_bits(struct btrfs_fs_info *fs_info, |
3b02a68a | 4178 | enum btrfs_feature_set set, |
2eaa055f JM |
4179 | u64 change_mask, u64 flags, u64 supported_flags, |
4180 | u64 safe_set, u64 safe_clear) | |
4181 | { | |
f10152bc | 4182 | const char *type = btrfs_feature_set_name(set); |
3b02a68a | 4183 | char *names; |
2eaa055f JM |
4184 | u64 disallowed, unsupported; |
4185 | u64 set_mask = flags & change_mask; | |
4186 | u64 clear_mask = ~flags & change_mask; | |
4187 | ||
4188 | unsupported = set_mask & ~supported_flags; | |
4189 | if (unsupported) { | |
3b02a68a JM |
4190 | names = btrfs_printable_features(set, unsupported); |
4191 | if (names) { | |
0b246afa JM |
4192 | btrfs_warn(fs_info, |
4193 | "this kernel does not support the %s feature bit%s", | |
4194 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4195 | kfree(names); |
4196 | } else | |
0b246afa JM |
4197 | btrfs_warn(fs_info, |
4198 | "this kernel does not support %s bits 0x%llx", | |
4199 | type, unsupported); | |
2eaa055f JM |
4200 | return -EOPNOTSUPP; |
4201 | } | |
4202 | ||
4203 | disallowed = set_mask & ~safe_set; | |
4204 | if (disallowed) { | |
3b02a68a JM |
4205 | names = btrfs_printable_features(set, disallowed); |
4206 | if (names) { | |
0b246afa JM |
4207 | btrfs_warn(fs_info, |
4208 | "can't set the %s feature bit%s while mounted", | |
4209 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4210 | kfree(names); |
4211 | } else | |
0b246afa JM |
4212 | btrfs_warn(fs_info, |
4213 | "can't set %s bits 0x%llx while mounted", | |
4214 | type, disallowed); | |
2eaa055f JM |
4215 | return -EPERM; |
4216 | } | |
4217 | ||
4218 | disallowed = clear_mask & ~safe_clear; | |
4219 | if (disallowed) { | |
3b02a68a JM |
4220 | names = btrfs_printable_features(set, disallowed); |
4221 | if (names) { | |
0b246afa JM |
4222 | btrfs_warn(fs_info, |
4223 | "can't clear the %s feature bit%s while mounted", | |
4224 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4225 | kfree(names); |
4226 | } else | |
0b246afa JM |
4227 | btrfs_warn(fs_info, |
4228 | "can't clear %s bits 0x%llx while mounted", | |
4229 | type, disallowed); | |
2eaa055f JM |
4230 | return -EPERM; |
4231 | } | |
4232 | ||
4233 | return 0; | |
4234 | } | |
4235 | ||
2ff7e61e JM |
4236 | #define check_feature(fs_info, change_mask, flags, mask_base) \ |
4237 | check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ | |
2eaa055f JM |
4238 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
4239 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
4240 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
4241 | ||
4242 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
4243 | { | |
0b246afa JM |
4244 | struct inode *inode = file_inode(file); |
4245 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4246 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4247 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
2eaa055f JM |
4248 | struct btrfs_ioctl_feature_flags flags[2]; |
4249 | struct btrfs_trans_handle *trans; | |
4250 | u64 newflags; | |
4251 | int ret; | |
4252 | ||
4253 | if (!capable(CAP_SYS_ADMIN)) | |
4254 | return -EPERM; | |
4255 | ||
4256 | if (copy_from_user(flags, arg, sizeof(flags))) | |
4257 | return -EFAULT; | |
4258 | ||
4259 | /* Nothing to do */ | |
4260 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
4261 | !flags[0].incompat_flags) | |
4262 | return 0; | |
4263 | ||
2ff7e61e | 4264 | ret = check_feature(fs_info, flags[0].compat_flags, |
2eaa055f JM |
4265 | flags[1].compat_flags, COMPAT); |
4266 | if (ret) | |
4267 | return ret; | |
4268 | ||
2ff7e61e | 4269 | ret = check_feature(fs_info, flags[0].compat_ro_flags, |
2eaa055f JM |
4270 | flags[1].compat_ro_flags, COMPAT_RO); |
4271 | if (ret) | |
4272 | return ret; | |
4273 | ||
2ff7e61e | 4274 | ret = check_feature(fs_info, flags[0].incompat_flags, |
2eaa055f JM |
4275 | flags[1].incompat_flags, INCOMPAT); |
4276 | if (ret) | |
4277 | return ret; | |
4278 | ||
7ab19625 DS |
4279 | ret = mnt_want_write_file(file); |
4280 | if (ret) | |
4281 | return ret; | |
4282 | ||
8051aa1a | 4283 | trans = btrfs_start_transaction(root, 0); |
7ab19625 DS |
4284 | if (IS_ERR(trans)) { |
4285 | ret = PTR_ERR(trans); | |
4286 | goto out_drop_write; | |
4287 | } | |
2eaa055f | 4288 | |
0b246afa | 4289 | spin_lock(&fs_info->super_lock); |
2eaa055f JM |
4290 | newflags = btrfs_super_compat_flags(super_block); |
4291 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
4292 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
4293 | btrfs_set_super_compat_flags(super_block, newflags); | |
4294 | ||
4295 | newflags = btrfs_super_compat_ro_flags(super_block); | |
4296 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
4297 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
4298 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
4299 | ||
4300 | newflags = btrfs_super_incompat_flags(super_block); | |
4301 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
4302 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
4303 | btrfs_set_super_incompat_flags(super_block, newflags); | |
0b246afa | 4304 | spin_unlock(&fs_info->super_lock); |
2eaa055f | 4305 | |
3a45bb20 | 4306 | ret = btrfs_commit_transaction(trans); |
7ab19625 DS |
4307 | out_drop_write: |
4308 | mnt_drop_write_file(file); | |
4309 | ||
4310 | return ret; | |
2eaa055f JM |
4311 | } |
4312 | ||
9ad12305 | 4313 | static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat) |
2351f431 JB |
4314 | { |
4315 | struct btrfs_ioctl_send_args *arg; | |
4316 | int ret; | |
4317 | ||
4318 | if (compat) { | |
4319 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4320 | struct btrfs_ioctl_send_args_32 args32; | |
4321 | ||
4322 | ret = copy_from_user(&args32, argp, sizeof(args32)); | |
4323 | if (ret) | |
4324 | return -EFAULT; | |
4325 | arg = kzalloc(sizeof(*arg), GFP_KERNEL); | |
4326 | if (!arg) | |
4327 | return -ENOMEM; | |
4328 | arg->send_fd = args32.send_fd; | |
4329 | arg->clone_sources_count = args32.clone_sources_count; | |
4330 | arg->clone_sources = compat_ptr(args32.clone_sources); | |
4331 | arg->parent_root = args32.parent_root; | |
4332 | arg->flags = args32.flags; | |
4333 | memcpy(arg->reserved, args32.reserved, | |
4334 | sizeof(args32.reserved)); | |
4335 | #else | |
4336 | return -ENOTTY; | |
4337 | #endif | |
4338 | } else { | |
4339 | arg = memdup_user(argp, sizeof(*arg)); | |
4340 | if (IS_ERR(arg)) | |
4341 | return PTR_ERR(arg); | |
4342 | } | |
9ad12305 | 4343 | ret = btrfs_ioctl_send(inode, arg); |
2351f431 JB |
4344 | kfree(arg); |
4345 | return ret; | |
4346 | } | |
4347 | ||
1881fba8 OS |
4348 | static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, |
4349 | bool compat) | |
4350 | { | |
4351 | struct btrfs_ioctl_encoded_io_args args = { 0 }; | |
4352 | size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, | |
4353 | flags); | |
4354 | size_t copy_end; | |
4355 | struct iovec iovstack[UIO_FASTIOV]; | |
4356 | struct iovec *iov = iovstack; | |
4357 | struct iov_iter iter; | |
4358 | loff_t pos; | |
4359 | struct kiocb kiocb; | |
4360 | ssize_t ret; | |
4361 | ||
4362 | if (!capable(CAP_SYS_ADMIN)) { | |
4363 | ret = -EPERM; | |
4364 | goto out_acct; | |
4365 | } | |
4366 | ||
4367 | if (compat) { | |
4368 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4369 | struct btrfs_ioctl_encoded_io_args_32 args32; | |
4370 | ||
4371 | copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, | |
4372 | flags); | |
4373 | if (copy_from_user(&args32, argp, copy_end)) { | |
4374 | ret = -EFAULT; | |
4375 | goto out_acct; | |
4376 | } | |
4377 | args.iov = compat_ptr(args32.iov); | |
4378 | args.iovcnt = args32.iovcnt; | |
4379 | args.offset = args32.offset; | |
4380 | args.flags = args32.flags; | |
4381 | #else | |
4382 | return -ENOTTY; | |
4383 | #endif | |
4384 | } else { | |
4385 | copy_end = copy_end_kernel; | |
4386 | if (copy_from_user(&args, argp, copy_end)) { | |
4387 | ret = -EFAULT; | |
4388 | goto out_acct; | |
4389 | } | |
4390 | } | |
4391 | if (args.flags != 0) { | |
4392 | ret = -EINVAL; | |
4393 | goto out_acct; | |
4394 | } | |
4395 | ||
de4eda9d | 4396 | ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), |
1881fba8 OS |
4397 | &iov, &iter); |
4398 | if (ret < 0) | |
4399 | goto out_acct; | |
4400 | ||
4401 | if (iov_iter_count(&iter) == 0) { | |
4402 | ret = 0; | |
4403 | goto out_iov; | |
4404 | } | |
4405 | pos = args.offset; | |
4406 | ret = rw_verify_area(READ, file, &pos, args.len); | |
4407 | if (ret < 0) | |
4408 | goto out_iov; | |
4409 | ||
4410 | init_sync_kiocb(&kiocb, file); | |
4411 | kiocb.ki_pos = pos; | |
4412 | ||
4413 | ret = btrfs_encoded_read(&kiocb, &iter, &args); | |
4414 | if (ret >= 0) { | |
4415 | fsnotify_access(file); | |
4416 | if (copy_to_user(argp + copy_end, | |
4417 | (char *)&args + copy_end_kernel, | |
4418 | sizeof(args) - copy_end_kernel)) | |
4419 | ret = -EFAULT; | |
4420 | } | |
4421 | ||
4422 | out_iov: | |
4423 | kfree(iov); | |
4424 | out_acct: | |
4425 | if (ret > 0) | |
4426 | add_rchar(current, ret); | |
4427 | inc_syscr(current); | |
4428 | return ret; | |
4429 | } | |
4430 | ||
7c0c7269 OS |
4431 | static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat) |
4432 | { | |
4433 | struct btrfs_ioctl_encoded_io_args args; | |
4434 | struct iovec iovstack[UIO_FASTIOV]; | |
4435 | struct iovec *iov = iovstack; | |
4436 | struct iov_iter iter; | |
4437 | loff_t pos; | |
4438 | struct kiocb kiocb; | |
4439 | ssize_t ret; | |
4440 | ||
4441 | if (!capable(CAP_SYS_ADMIN)) { | |
4442 | ret = -EPERM; | |
4443 | goto out_acct; | |
4444 | } | |
4445 | ||
4446 | if (!(file->f_mode & FMODE_WRITE)) { | |
4447 | ret = -EBADF; | |
4448 | goto out_acct; | |
4449 | } | |
4450 | ||
4451 | if (compat) { | |
4452 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4453 | struct btrfs_ioctl_encoded_io_args_32 args32; | |
4454 | ||
4455 | if (copy_from_user(&args32, argp, sizeof(args32))) { | |
4456 | ret = -EFAULT; | |
4457 | goto out_acct; | |
4458 | } | |
4459 | args.iov = compat_ptr(args32.iov); | |
4460 | args.iovcnt = args32.iovcnt; | |
4461 | args.offset = args32.offset; | |
4462 | args.flags = args32.flags; | |
4463 | args.len = args32.len; | |
4464 | args.unencoded_len = args32.unencoded_len; | |
4465 | args.unencoded_offset = args32.unencoded_offset; | |
4466 | args.compression = args32.compression; | |
4467 | args.encryption = args32.encryption; | |
4468 | memcpy(args.reserved, args32.reserved, sizeof(args.reserved)); | |
4469 | #else | |
4470 | return -ENOTTY; | |
4471 | #endif | |
4472 | } else { | |
4473 | if (copy_from_user(&args, argp, sizeof(args))) { | |
4474 | ret = -EFAULT; | |
4475 | goto out_acct; | |
4476 | } | |
4477 | } | |
4478 | ||
4479 | ret = -EINVAL; | |
4480 | if (args.flags != 0) | |
4481 | goto out_acct; | |
4482 | if (memchr_inv(args.reserved, 0, sizeof(args.reserved))) | |
4483 | goto out_acct; | |
4484 | if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE && | |
4485 | args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE) | |
4486 | goto out_acct; | |
4487 | if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES || | |
4488 | args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES) | |
4489 | goto out_acct; | |
4490 | if (args.unencoded_offset > args.unencoded_len) | |
4491 | goto out_acct; | |
4492 | if (args.len > args.unencoded_len - args.unencoded_offset) | |
4493 | goto out_acct; | |
4494 | ||
de4eda9d | 4495 | ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), |
7c0c7269 OS |
4496 | &iov, &iter); |
4497 | if (ret < 0) | |
4498 | goto out_acct; | |
4499 | ||
4500 | file_start_write(file); | |
4501 | ||
4502 | if (iov_iter_count(&iter) == 0) { | |
4503 | ret = 0; | |
4504 | goto out_end_write; | |
4505 | } | |
4506 | pos = args.offset; | |
4507 | ret = rw_verify_area(WRITE, file, &pos, args.len); | |
4508 | if (ret < 0) | |
4509 | goto out_end_write; | |
4510 | ||
4511 | init_sync_kiocb(&kiocb, file); | |
4512 | ret = kiocb_set_rw_flags(&kiocb, 0); | |
4513 | if (ret) | |
4514 | goto out_end_write; | |
4515 | kiocb.ki_pos = pos; | |
4516 | ||
4517 | ret = btrfs_do_write_iter(&kiocb, &iter, &args); | |
4518 | if (ret > 0) | |
4519 | fsnotify_modify(file); | |
4520 | ||
4521 | out_end_write: | |
4522 | file_end_write(file); | |
4523 | kfree(iov); | |
4524 | out_acct: | |
4525 | if (ret > 0) | |
4526 | add_wchar(current, ret); | |
4527 | inc_syscw(current); | |
4528 | return ret; | |
4529 | } | |
4530 | ||
f46b5a66 CH |
4531 | long btrfs_ioctl(struct file *file, unsigned int |
4532 | cmd, unsigned long arg) | |
4533 | { | |
0b246afa JM |
4534 | struct inode *inode = file_inode(file); |
4535 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4536 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4bcabaa3 | 4537 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
4538 | |
4539 | switch (cmd) { | |
6cbff00f | 4540 | case FS_IOC_GETVERSION: |
dc408ccd | 4541 | return btrfs_ioctl_getversion(inode, argp); |
40cf931f | 4542 | case FS_IOC_GETFSLABEL: |
b929c1d8 | 4543 | return btrfs_ioctl_get_fslabel(fs_info, argp); |
40cf931f ES |
4544 | case FS_IOC_SETFSLABEL: |
4545 | return btrfs_ioctl_set_fslabel(file, argp); | |
f7039b1d | 4546 | case FITRIM: |
b929c1d8 | 4547 | return btrfs_ioctl_fitrim(fs_info, argp); |
f46b5a66 | 4548 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 4549 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 4550 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 4551 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 4552 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 4553 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
4554 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
4555 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c | 4556 | case BTRFS_IOC_SNAP_DESTROY: |
949964c9 MPS |
4557 | return btrfs_ioctl_snap_destroy(file, argp, false); |
4558 | case BTRFS_IOC_SNAP_DESTROY_V2: | |
4559 | return btrfs_ioctl_snap_destroy(file, argp, true); | |
0caa102d | 4560 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
9ad12305 | 4561 | return btrfs_ioctl_subvol_getflags(inode, argp); |
0caa102d LZ |
4562 | case BTRFS_IOC_SUBVOL_SETFLAGS: |
4563 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
4564 | case BTRFS_IOC_DEFAULT_SUBVOL: |
4565 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 4566 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
4567 | return btrfs_ioctl_defrag(file, NULL); |
4568 | case BTRFS_IOC_DEFRAG_RANGE: | |
4569 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 4570 | case BTRFS_IOC_RESIZE: |
198605a8 | 4571 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 4572 | case BTRFS_IOC_ADD_DEV: |
2ff7e61e | 4573 | return btrfs_ioctl_add_dev(fs_info, argp); |
f46b5a66 | 4574 | case BTRFS_IOC_RM_DEV: |
da24927b | 4575 | return btrfs_ioctl_rm_dev(file, argp); |
6b526ed7 AJ |
4576 | case BTRFS_IOC_RM_DEV_V2: |
4577 | return btrfs_ioctl_rm_dev_v2(file, argp); | |
475f6387 | 4578 | case BTRFS_IOC_FS_INFO: |
2ff7e61e | 4579 | return btrfs_ioctl_fs_info(fs_info, argp); |
475f6387 | 4580 | case BTRFS_IOC_DEV_INFO: |
2ff7e61e | 4581 | return btrfs_ioctl_dev_info(fs_info, argp); |
ac8e9819 | 4582 | case BTRFS_IOC_TREE_SEARCH: |
9ad12305 | 4583 | return btrfs_ioctl_tree_search(inode, argp); |
cc68a8a5 | 4584 | case BTRFS_IOC_TREE_SEARCH_V2: |
9ad12305 | 4585 | return btrfs_ioctl_tree_search_v2(inode, argp); |
ac8e9819 | 4586 | case BTRFS_IOC_INO_LOOKUP: |
dc408ccd | 4587 | return btrfs_ioctl_ino_lookup(root, argp); |
d7728c96 JS |
4588 | case BTRFS_IOC_INO_PATHS: |
4589 | return btrfs_ioctl_ino_to_path(root, argp); | |
4590 | case BTRFS_IOC_LOGICAL_INO: | |
d24a67b2 ZB |
4591 | return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); |
4592 | case BTRFS_IOC_LOGICAL_INO_V2: | |
4593 | return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); | |
1406e432 | 4594 | case BTRFS_IOC_SPACE_INFO: |
2ff7e61e | 4595 | return btrfs_ioctl_space_info(fs_info, argp); |
9b199859 FDBM |
4596 | case BTRFS_IOC_SYNC: { |
4597 | int ret; | |
4598 | ||
9db4dc24 | 4599 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); |
9b199859 FDBM |
4600 | if (ret) |
4601 | return ret; | |
0b246afa | 4602 | ret = btrfs_sync_fs(inode->i_sb, 1); |
2fad4e83 DS |
4603 | /* |
4604 | * The transaction thread may want to do more work, | |
01327610 | 4605 | * namely it pokes the cleaner kthread that will start |
2fad4e83 DS |
4606 | * processing uncleaned subvols. |
4607 | */ | |
0b246afa | 4608 | wake_up_process(fs_info->transaction_kthread); |
9b199859 FDBM |
4609 | return ret; |
4610 | } | |
46204592 | 4611 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 4612 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 4613 | case BTRFS_IOC_WAIT_SYNC: |
2ff7e61e | 4614 | return btrfs_ioctl_wait_sync(fs_info, argp); |
475f6387 | 4615 | case BTRFS_IOC_SCRUB: |
b8e95489 | 4616 | return btrfs_ioctl_scrub(file, argp); |
475f6387 | 4617 | case BTRFS_IOC_SCRUB_CANCEL: |
2ff7e61e | 4618 | return btrfs_ioctl_scrub_cancel(fs_info); |
475f6387 | 4619 | case BTRFS_IOC_SCRUB_PROGRESS: |
2ff7e61e | 4620 | return btrfs_ioctl_scrub_progress(fs_info, argp); |
c9e9f97b | 4621 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 4622 | return btrfs_ioctl_balance(file, argp); |
837d5b6e | 4623 | case BTRFS_IOC_BALANCE_CTL: |
2ff7e61e | 4624 | return btrfs_ioctl_balance_ctl(fs_info, arg); |
19a39dce | 4625 | case BTRFS_IOC_BALANCE_PROGRESS: |
2ff7e61e | 4626 | return btrfs_ioctl_balance_progress(fs_info, argp); |
8ea05e3a AB |
4627 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
4628 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
4629 | #ifdef CONFIG_64BIT |
4630 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
4631 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
4632 | #endif | |
31db9f7c | 4633 | case BTRFS_IOC_SEND: |
9ad12305 | 4634 | return _btrfs_ioctl_send(inode, argp, false); |
2351f431 JB |
4635 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
4636 | case BTRFS_IOC_SEND_32: | |
9ad12305 | 4637 | return _btrfs_ioctl_send(inode, argp, true); |
2351f431 | 4638 | #endif |
c11d2c23 | 4639 | case BTRFS_IOC_GET_DEV_STATS: |
2ff7e61e | 4640 | return btrfs_ioctl_get_dev_stats(fs_info, argp); |
5d13a37b | 4641 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 4642 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 4643 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 4644 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 4645 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 4646 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 4647 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 4648 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
4649 | case BTRFS_IOC_QUOTA_RESCAN: |
4650 | return btrfs_ioctl_quota_rescan(file, argp); | |
4651 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
b929c1d8 | 4652 | return btrfs_ioctl_quota_rescan_status(fs_info, argp); |
57254b6e | 4653 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
b929c1d8 | 4654 | return btrfs_ioctl_quota_rescan_wait(fs_info, argp); |
3f6bcfbd | 4655 | case BTRFS_IOC_DEV_REPLACE: |
2ff7e61e | 4656 | return btrfs_ioctl_dev_replace(fs_info, argp); |
2eaa055f | 4657 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 4658 | return btrfs_ioctl_get_supported_features(argp); |
2eaa055f | 4659 | case BTRFS_IOC_GET_FEATURES: |
b929c1d8 | 4660 | return btrfs_ioctl_get_features(fs_info, argp); |
2eaa055f JM |
4661 | case BTRFS_IOC_SET_FEATURES: |
4662 | return btrfs_ioctl_set_features(file, argp); | |
b64ec075 | 4663 | case BTRFS_IOC_GET_SUBVOL_INFO: |
9ad12305 | 4664 | return btrfs_ioctl_get_subvol_info(inode, argp); |
42e4b520 | 4665 | case BTRFS_IOC_GET_SUBVOL_ROOTREF: |
dc408ccd | 4666 | return btrfs_ioctl_get_subvol_rootref(root, argp); |
23d0b79d TM |
4667 | case BTRFS_IOC_INO_LOOKUP_USER: |
4668 | return btrfs_ioctl_ino_lookup_user(file, argp); | |
14605409 BB |
4669 | case FS_IOC_ENABLE_VERITY: |
4670 | return fsverity_ioctl_enable(file, (const void __user *)argp); | |
4671 | case FS_IOC_MEASURE_VERITY: | |
4672 | return fsverity_ioctl_measure(file, argp); | |
1881fba8 OS |
4673 | case BTRFS_IOC_ENCODED_READ: |
4674 | return btrfs_ioctl_encoded_read(file, argp, false); | |
7c0c7269 OS |
4675 | case BTRFS_IOC_ENCODED_WRITE: |
4676 | return btrfs_ioctl_encoded_write(file, argp, false); | |
1881fba8 OS |
4677 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
4678 | case BTRFS_IOC_ENCODED_READ_32: | |
4679 | return btrfs_ioctl_encoded_read(file, argp, true); | |
7c0c7269 OS |
4680 | case BTRFS_IOC_ENCODED_WRITE_32: |
4681 | return btrfs_ioctl_encoded_write(file, argp, true); | |
1881fba8 | 4682 | #endif |
f46b5a66 CH |
4683 | } |
4684 | ||
4685 | return -ENOTTY; | |
4686 | } | |
4c63c245 LD |
4687 | |
4688 | #ifdef CONFIG_COMPAT | |
4689 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
4690 | { | |
2a362249 JM |
4691 | /* |
4692 | * These all access 32-bit values anyway so no further | |
4693 | * handling is necessary. | |
4694 | */ | |
4c63c245 | 4695 | switch (cmd) { |
4c63c245 LD |
4696 | case FS_IOC32_GETVERSION: |
4697 | cmd = FS_IOC_GETVERSION; | |
4698 | break; | |
4c63c245 LD |
4699 | } |
4700 | ||
4701 | return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); | |
4702 | } | |
4703 | #endif |