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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> |
f46b5a66 CH |
31 | #include "ctree.h" |
32 | #include "disk-io.h" | |
949964c9 | 33 | #include "export.h" |
f46b5a66 CH |
34 | #include "transaction.h" |
35 | #include "btrfs_inode.h" | |
f46b5a66 CH |
36 | #include "print-tree.h" |
37 | #include "volumes.h" | |
925baedd | 38 | #include "locking.h" |
d7728c96 | 39 | #include "backref.h" |
606686ee | 40 | #include "rcu-string.h" |
31db9f7c | 41 | #include "send.h" |
3f6bcfbd | 42 | #include "dev-replace.h" |
63541927 | 43 | #include "props.h" |
3b02a68a | 44 | #include "sysfs.h" |
fcebe456 | 45 | #include "qgroup.h" |
1ec9a1ae | 46 | #include "tree-log.h" |
ebb8765b | 47 | #include "compression.h" |
8719aaae | 48 | #include "space-info.h" |
86736342 | 49 | #include "delalloc-space.h" |
aac0023c | 50 | #include "block-group.h" |
22b398ee | 51 | #include "subpage.h" |
f46b5a66 | 52 | |
abccd00f HM |
53 | #ifdef CONFIG_64BIT |
54 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
55 | * structures are incorrect, as the timespec structure from userspace | |
56 | * is 4 bytes too small. We define these alternatives here to teach | |
57 | * the kernel about the 32-bit struct packing. | |
58 | */ | |
59 | struct btrfs_ioctl_timespec_32 { | |
60 | __u64 sec; | |
61 | __u32 nsec; | |
62 | } __attribute__ ((__packed__)); | |
63 | ||
64 | struct btrfs_ioctl_received_subvol_args_32 { | |
65 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
66 | __u64 stransid; /* in */ | |
67 | __u64 rtransid; /* out */ | |
68 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
69 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
70 | __u64 flags; /* in */ | |
71 | __u64 reserved[16]; /* in */ | |
72 | } __attribute__ ((__packed__)); | |
73 | ||
74 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
75 | struct btrfs_ioctl_received_subvol_args_32) | |
76 | #endif | |
77 | ||
2351f431 JB |
78 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) |
79 | struct btrfs_ioctl_send_args_32 { | |
80 | __s64 send_fd; /* in */ | |
81 | __u64 clone_sources_count; /* in */ | |
82 | compat_uptr_t clone_sources; /* in */ | |
83 | __u64 parent_root; /* in */ | |
84 | __u64 flags; /* in */ | |
85 | __u64 reserved[4]; /* in */ | |
86 | } __attribute__ ((__packed__)); | |
87 | ||
88 | #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ | |
89 | struct btrfs_ioctl_send_args_32) | |
90 | #endif | |
abccd00f | 91 | |
6cbff00f | 92 | /* Mask out flags that are inappropriate for the given type of inode. */ |
1905a0f7 DS |
93 | static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode, |
94 | unsigned int flags) | |
6cbff00f | 95 | { |
1905a0f7 | 96 | if (S_ISDIR(inode->i_mode)) |
6cbff00f | 97 | return flags; |
1905a0f7 | 98 | else if (S_ISREG(inode->i_mode)) |
6cbff00f CH |
99 | return flags & ~FS_DIRSYNC_FL; |
100 | else | |
101 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
102 | } | |
103 | ||
104 | /* | |
a157d4fd DS |
105 | * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS |
106 | * ioctl. | |
6cbff00f | 107 | */ |
77eea05e | 108 | static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode) |
6cbff00f CH |
109 | { |
110 | unsigned int iflags = 0; | |
77eea05e | 111 | u32 flags = binode->flags; |
14605409 | 112 | u32 ro_flags = binode->ro_flags; |
6cbff00f CH |
113 | |
114 | if (flags & BTRFS_INODE_SYNC) | |
115 | iflags |= FS_SYNC_FL; | |
116 | if (flags & BTRFS_INODE_IMMUTABLE) | |
117 | iflags |= FS_IMMUTABLE_FL; | |
118 | if (flags & BTRFS_INODE_APPEND) | |
119 | iflags |= FS_APPEND_FL; | |
120 | if (flags & BTRFS_INODE_NODUMP) | |
121 | iflags |= FS_NODUMP_FL; | |
122 | if (flags & BTRFS_INODE_NOATIME) | |
123 | iflags |= FS_NOATIME_FL; | |
124 | if (flags & BTRFS_INODE_DIRSYNC) | |
125 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
126 | if (flags & BTRFS_INODE_NODATACOW) |
127 | iflags |= FS_NOCOW_FL; | |
14605409 BB |
128 | if (ro_flags & BTRFS_INODE_RO_VERITY) |
129 | iflags |= FS_VERITY_FL; | |
d0092bdd | 130 | |
13f48dc9 | 131 | if (flags & BTRFS_INODE_NOCOMPRESS) |
d0092bdd | 132 | iflags |= FS_NOCOMP_FL; |
13f48dc9 ST |
133 | else if (flags & BTRFS_INODE_COMPRESS) |
134 | iflags |= FS_COMPR_FL; | |
6cbff00f CH |
135 | |
136 | return iflags; | |
137 | } | |
138 | ||
139 | /* | |
140 | * Update inode->i_flags based on the btrfs internal flags. | |
141 | */ | |
7b6a221e | 142 | void btrfs_sync_inode_flags_to_i_flags(struct inode *inode) |
6cbff00f | 143 | { |
5c57b8b6 | 144 | struct btrfs_inode *binode = BTRFS_I(inode); |
3cc79392 | 145 | unsigned int new_fl = 0; |
6cbff00f | 146 | |
5c57b8b6 | 147 | if (binode->flags & BTRFS_INODE_SYNC) |
3cc79392 | 148 | new_fl |= S_SYNC; |
5c57b8b6 | 149 | if (binode->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 150 | new_fl |= S_IMMUTABLE; |
5c57b8b6 | 151 | if (binode->flags & BTRFS_INODE_APPEND) |
3cc79392 | 152 | new_fl |= S_APPEND; |
5c57b8b6 | 153 | if (binode->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 154 | new_fl |= S_NOATIME; |
5c57b8b6 | 155 | if (binode->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 | 156 | new_fl |= S_DIRSYNC; |
14605409 BB |
157 | if (binode->ro_flags & BTRFS_INODE_RO_VERITY) |
158 | new_fl |= S_VERITY; | |
3cc79392 FM |
159 | |
160 | set_mask_bits(&inode->i_flags, | |
14605409 BB |
161 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC | |
162 | S_VERITY, new_fl); | |
6cbff00f CH |
163 | } |
164 | ||
f37c563b DS |
165 | /* |
166 | * Check if @flags are a supported and valid set of FS_*_FL flags and that | |
167 | * the old and new flags are not conflicting | |
168 | */ | |
169 | static int check_fsflags(unsigned int old_flags, unsigned int flags) | |
75e7cb7f LB |
170 | { |
171 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
172 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
173 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
174 | FS_NOCOMP_FL | FS_COMPR_FL | |
175 | FS_NOCOW_FL)) | |
75e7cb7f LB |
176 | return -EOPNOTSUPP; |
177 | ||
f37c563b | 178 | /* COMPR and NOCOMP on new/old are valid */ |
75e7cb7f LB |
179 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) |
180 | return -EINVAL; | |
181 | ||
f37c563b DS |
182 | if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL)) |
183 | return -EINVAL; | |
184 | ||
185 | /* NOCOW and compression options are mutually exclusive */ | |
186 | if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL))) | |
187 | return -EINVAL; | |
188 | if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL))) | |
189 | return -EINVAL; | |
190 | ||
75e7cb7f LB |
191 | return 0; |
192 | } | |
193 | ||
d206e9c9 NA |
194 | static int check_fsflags_compatible(struct btrfs_fs_info *fs_info, |
195 | unsigned int flags) | |
196 | { | |
197 | if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL)) | |
198 | return -EPERM; | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
97fc2977 MS |
203 | /* |
204 | * Set flags/xflags from the internal inode flags. The remaining items of | |
205 | * fsxattr are zeroed. | |
206 | */ | |
207 | int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) | |
6cbff00f | 208 | { |
97fc2977 MS |
209 | struct btrfs_inode *binode = BTRFS_I(d_inode(dentry)); |
210 | ||
77eea05e | 211 | fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode)); |
97fc2977 MS |
212 | return 0; |
213 | } | |
214 | ||
215 | int btrfs_fileattr_set(struct user_namespace *mnt_userns, | |
216 | struct dentry *dentry, struct fileattr *fa) | |
217 | { | |
218 | struct inode *inode = d_inode(dentry); | |
0b246afa | 219 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
5c57b8b6 DS |
220 | struct btrfs_inode *binode = BTRFS_I(inode); |
221 | struct btrfs_root *root = binode->root; | |
6cbff00f | 222 | struct btrfs_trans_handle *trans; |
5aca2842 | 223 | unsigned int fsflags, old_fsflags; |
6cbff00f | 224 | int ret; |
ff9fef55 | 225 | const char *comp = NULL; |
f37c563b | 226 | u32 binode_flags; |
6cbff00f | 227 | |
b83cc969 LZ |
228 | if (btrfs_root_readonly(root)) |
229 | return -EROFS; | |
230 | ||
97fc2977 MS |
231 | if (fileattr_has_fsx(fa)) |
232 | return -EOPNOTSUPP; | |
e7848683 | 233 | |
97fc2977 | 234 | fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags); |
77eea05e | 235 | old_fsflags = btrfs_inode_flags_to_fsflags(binode); |
f37c563b DS |
236 | ret = check_fsflags(old_fsflags, fsflags); |
237 | if (ret) | |
97fc2977 | 238 | return ret; |
f37c563b | 239 | |
d206e9c9 NA |
240 | ret = check_fsflags_compatible(fs_info, fsflags); |
241 | if (ret) | |
97fc2977 | 242 | return ret; |
d206e9c9 | 243 | |
f37c563b | 244 | binode_flags = binode->flags; |
5c57b8b6 | 245 | if (fsflags & FS_SYNC_FL) |
d2b8fcfe | 246 | binode_flags |= BTRFS_INODE_SYNC; |
6cbff00f | 247 | else |
d2b8fcfe | 248 | binode_flags &= ~BTRFS_INODE_SYNC; |
5c57b8b6 | 249 | if (fsflags & FS_IMMUTABLE_FL) |
d2b8fcfe | 250 | binode_flags |= BTRFS_INODE_IMMUTABLE; |
6cbff00f | 251 | else |
d2b8fcfe | 252 | binode_flags &= ~BTRFS_INODE_IMMUTABLE; |
5c57b8b6 | 253 | if (fsflags & FS_APPEND_FL) |
d2b8fcfe | 254 | binode_flags |= BTRFS_INODE_APPEND; |
6cbff00f | 255 | else |
d2b8fcfe | 256 | binode_flags &= ~BTRFS_INODE_APPEND; |
5c57b8b6 | 257 | if (fsflags & FS_NODUMP_FL) |
d2b8fcfe | 258 | binode_flags |= BTRFS_INODE_NODUMP; |
6cbff00f | 259 | else |
d2b8fcfe | 260 | binode_flags &= ~BTRFS_INODE_NODUMP; |
5c57b8b6 | 261 | if (fsflags & FS_NOATIME_FL) |
d2b8fcfe | 262 | binode_flags |= BTRFS_INODE_NOATIME; |
6cbff00f | 263 | else |
d2b8fcfe | 264 | binode_flags &= ~BTRFS_INODE_NOATIME; |
97fc2977 MS |
265 | |
266 | /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */ | |
267 | if (!fa->flags_valid) { | |
268 | /* 1 item for the inode */ | |
269 | trans = btrfs_start_transaction(root, 1); | |
9b8a233b RH |
270 | if (IS_ERR(trans)) |
271 | return PTR_ERR(trans); | |
97fc2977 MS |
272 | goto update_flags; |
273 | } | |
274 | ||
5c57b8b6 | 275 | if (fsflags & FS_DIRSYNC_FL) |
d2b8fcfe | 276 | binode_flags |= BTRFS_INODE_DIRSYNC; |
6cbff00f | 277 | else |
d2b8fcfe | 278 | binode_flags &= ~BTRFS_INODE_DIRSYNC; |
5c57b8b6 | 279 | if (fsflags & FS_NOCOW_FL) { |
44e5194b | 280 | if (S_ISREG(inode->i_mode)) { |
7e97b8da DS |
281 | /* |
282 | * It's safe to turn csums off here, no extents exist. | |
283 | * Otherwise we want the flag to reflect the real COW | |
284 | * status of the file and will not set it. | |
285 | */ | |
286 | if (inode->i_size == 0) | |
d2b8fcfe AJ |
287 | binode_flags |= BTRFS_INODE_NODATACOW | |
288 | BTRFS_INODE_NODATASUM; | |
7e97b8da | 289 | } else { |
d2b8fcfe | 290 | binode_flags |= BTRFS_INODE_NODATACOW; |
7e97b8da DS |
291 | } |
292 | } else { | |
293 | /* | |
01327610 | 294 | * Revert back under same assumptions as above |
7e97b8da | 295 | */ |
44e5194b | 296 | if (S_ISREG(inode->i_mode)) { |
7e97b8da | 297 | if (inode->i_size == 0) |
d2b8fcfe AJ |
298 | binode_flags &= ~(BTRFS_INODE_NODATACOW | |
299 | BTRFS_INODE_NODATASUM); | |
7e97b8da | 300 | } else { |
d2b8fcfe | 301 | binode_flags &= ~BTRFS_INODE_NODATACOW; |
7e97b8da DS |
302 | } |
303 | } | |
6cbff00f | 304 | |
75e7cb7f LB |
305 | /* |
306 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
307 | * flag may be changed automatically if compression code won't make | |
308 | * things smaller. | |
309 | */ | |
5c57b8b6 | 310 | if (fsflags & FS_NOCOMP_FL) { |
d2b8fcfe AJ |
311 | binode_flags &= ~BTRFS_INODE_COMPRESS; |
312 | binode_flags |= BTRFS_INODE_NOCOMPRESS; | |
5c57b8b6 | 313 | } else if (fsflags & FS_COMPR_FL) { |
63541927 | 314 | |
97fc2977 MS |
315 | if (IS_SWAPFILE(inode)) |
316 | return -ETXTBSY; | |
eede2bf3 | 317 | |
d2b8fcfe AJ |
318 | binode_flags |= BTRFS_INODE_COMPRESS; |
319 | binode_flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 | 320 | |
93370509 DS |
321 | comp = btrfs_compress_type2str(fs_info->compress_type); |
322 | if (!comp || comp[0] == 0) | |
323 | comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB); | |
ebcb904d | 324 | } else { |
d2b8fcfe | 325 | binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 326 | } |
6cbff00f | 327 | |
ff9fef55 AJ |
328 | /* |
329 | * 1 for inode item | |
330 | * 2 for properties | |
331 | */ | |
332 | trans = btrfs_start_transaction(root, 3); | |
97fc2977 MS |
333 | if (IS_ERR(trans)) |
334 | return PTR_ERR(trans); | |
6cbff00f | 335 | |
ff9fef55 AJ |
336 | if (comp) { |
337 | ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp, | |
338 | strlen(comp), 0); | |
339 | if (ret) { | |
340 | btrfs_abort_transaction(trans, ret); | |
341 | goto out_end_trans; | |
342 | } | |
ff9fef55 AJ |
343 | } else { |
344 | ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL, | |
345 | 0, 0); | |
346 | if (ret && ret != -ENODATA) { | |
347 | btrfs_abort_transaction(trans, ret); | |
348 | goto out_end_trans; | |
349 | } | |
350 | } | |
351 | ||
97fc2977 | 352 | update_flags: |
d2b8fcfe | 353 | binode->flags = binode_flags; |
7b6a221e | 354 | btrfs_sync_inode_flags_to_i_flags(inode); |
0c4d2d95 | 355 | inode_inc_iversion(inode); |
c2050a45 | 356 | inode->i_ctime = current_time(inode); |
9a56fcd1 | 357 | ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); |
6cbff00f | 358 | |
ff9fef55 | 359 | out_end_trans: |
3a45bb20 | 360 | btrfs_end_transaction(trans); |
2d4e6f6a | 361 | return ret; |
6cbff00f CH |
362 | } |
363 | ||
0d7ed32c DS |
364 | /* |
365 | * Start exclusive operation @type, return true on success | |
366 | */ | |
c3e1f96c GR |
367 | bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, |
368 | enum btrfs_exclusive_operation type) | |
369 | { | |
0d7ed32c DS |
370 | bool ret = false; |
371 | ||
372 | spin_lock(&fs_info->super_lock); | |
373 | if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) { | |
374 | fs_info->exclusive_operation = type; | |
375 | ret = true; | |
376 | } | |
377 | spin_unlock(&fs_info->super_lock); | |
378 | ||
379 | return ret; | |
c3e1f96c GR |
380 | } |
381 | ||
578bda9e DS |
382 | /* |
383 | * Conditionally allow to enter the exclusive operation in case it's compatible | |
384 | * with the running one. This must be paired with btrfs_exclop_start_unlock and | |
385 | * btrfs_exclop_finish. | |
386 | * | |
387 | * Compatibility: | |
388 | * - the same type is already running | |
389 | * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller | |
390 | * must check the condition first that would allow none -> @type | |
391 | */ | |
392 | bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, | |
393 | enum btrfs_exclusive_operation type) | |
394 | { | |
395 | spin_lock(&fs_info->super_lock); | |
396 | if (fs_info->exclusive_operation == type) | |
397 | return true; | |
398 | ||
399 | spin_unlock(&fs_info->super_lock); | |
400 | return false; | |
401 | } | |
402 | ||
403 | void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info) | |
404 | { | |
405 | spin_unlock(&fs_info->super_lock); | |
406 | } | |
407 | ||
c3e1f96c GR |
408 | void btrfs_exclop_finish(struct btrfs_fs_info *fs_info) |
409 | { | |
0d7ed32c | 410 | spin_lock(&fs_info->super_lock); |
c3e1f96c | 411 | WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE); |
0d7ed32c | 412 | spin_unlock(&fs_info->super_lock); |
66a2823c | 413 | sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation"); |
c3e1f96c GR |
414 | } |
415 | ||
6cbff00f CH |
416 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) |
417 | { | |
496ad9aa | 418 | struct inode *inode = file_inode(file); |
6cbff00f CH |
419 | |
420 | return put_user(inode->i_generation, arg); | |
421 | } | |
f46b5a66 | 422 | |
b929c1d8 MPS |
423 | static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info, |
424 | void __user *arg) | |
f7039b1d | 425 | { |
f7039b1d LD |
426 | struct btrfs_device *device; |
427 | struct request_queue *q; | |
428 | struct fstrim_range range; | |
429 | u64 minlen = ULLONG_MAX; | |
430 | u64 num_devices = 0; | |
431 | int ret; | |
432 | ||
433 | if (!capable(CAP_SYS_ADMIN)) | |
434 | return -EPERM; | |
435 | ||
1cb3dc3f NA |
436 | /* |
437 | * btrfs_trim_block_group() depends on space cache, which is not | |
438 | * available in zoned filesystem. So, disallow fitrim on a zoned | |
439 | * filesystem for now. | |
440 | */ | |
441 | if (btrfs_is_zoned(fs_info)) | |
442 | return -EOPNOTSUPP; | |
443 | ||
f35f06c3 FM |
444 | /* |
445 | * If the fs is mounted with nologreplay, which requires it to be | |
446 | * mounted in RO mode as well, we can not allow discard on free space | |
447 | * inside block groups, because log trees refer to extents that are not | |
448 | * pinned in a block group's free space cache (pinning the extents is | |
449 | * precisely the first phase of replaying a log tree). | |
450 | */ | |
451 | if (btrfs_test_opt(fs_info, NOLOGREPLAY)) | |
452 | return -EROFS; | |
453 | ||
1f78160c XG |
454 | rcu_read_lock(); |
455 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
456 | dev_list) { | |
f7039b1d LD |
457 | if (!device->bdev) |
458 | continue; | |
459 | q = bdev_get_queue(device->bdev); | |
460 | if (blk_queue_discard(q)) { | |
461 | num_devices++; | |
50d0446e | 462 | minlen = min_t(u64, q->limits.discard_granularity, |
f7039b1d LD |
463 | minlen); |
464 | } | |
465 | } | |
1f78160c | 466 | rcu_read_unlock(); |
f4c697e6 | 467 | |
f7039b1d LD |
468 | if (!num_devices) |
469 | return -EOPNOTSUPP; | |
f7039b1d LD |
470 | if (copy_from_user(&range, arg, sizeof(range))) |
471 | return -EFAULT; | |
6ba9fc8e QW |
472 | |
473 | /* | |
474 | * NOTE: Don't truncate the range using super->total_bytes. Bytenr of | |
475 | * block group is in the logical address space, which can be any | |
476 | * sectorsize aligned bytenr in the range [0, U64_MAX]. | |
477 | */ | |
478 | if (range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 479 | return -EINVAL; |
f7039b1d LD |
480 | |
481 | range.minlen = max(range.minlen, minlen); | |
2ff7e61e | 482 | ret = btrfs_trim_fs(fs_info, &range); |
f7039b1d LD |
483 | if (ret < 0) |
484 | return ret; | |
485 | ||
486 | if (copy_to_user(arg, &range, sizeof(range))) | |
487 | return -EFAULT; | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
e1f60a65 | 492 | int __pure btrfs_is_empty_uuid(u8 *uuid) |
dd5f9615 | 493 | { |
46e0f66a CM |
494 | int i; |
495 | ||
496 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
497 | if (uuid[i]) | |
498 | return 0; | |
499 | } | |
500 | return 1; | |
dd5f9615 SB |
501 | } |
502 | ||
4d4340c9 CB |
503 | static noinline int create_subvol(struct user_namespace *mnt_userns, |
504 | struct inode *dir, struct dentry *dentry, | |
52f75f4f | 505 | const char *name, int namelen, |
8696c533 | 506 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 507 | { |
0b246afa | 508 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); |
f46b5a66 CH |
509 | struct btrfs_trans_handle *trans; |
510 | struct btrfs_key key; | |
49a3c4d9 | 511 | struct btrfs_root_item *root_item; |
f46b5a66 CH |
512 | struct btrfs_inode_item *inode_item; |
513 | struct extent_buffer *leaf; | |
d5c12070 | 514 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 515 | struct btrfs_root *new_root; |
d5c12070 | 516 | struct btrfs_block_rsv block_rsv; |
95582b00 | 517 | struct timespec64 cur_time = current_time(dir); |
5662344b | 518 | struct inode *inode; |
f46b5a66 CH |
519 | int ret; |
520 | int err; | |
2dfb1e43 | 521 | dev_t anon_dev = 0; |
f46b5a66 | 522 | u64 objectid; |
3de4586c | 523 | u64 index = 0; |
f46b5a66 | 524 | |
49a3c4d9 DS |
525 | root_item = kzalloc(sizeof(*root_item), GFP_KERNEL); |
526 | if (!root_item) | |
527 | return -ENOMEM; | |
528 | ||
543068a2 | 529 | ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid); |
2fbe8c8a | 530 | if (ret) |
49a3c4d9 | 531 | goto fail_free; |
6a912213 | 532 | |
2dfb1e43 QW |
533 | ret = get_anon_bdev(&anon_dev); |
534 | if (ret < 0) | |
535 | goto fail_free; | |
536 | ||
e09fe2d2 QW |
537 | /* |
538 | * Don't create subvolume whose level is not zero. Or qgroup will be | |
01327610 | 539 | * screwed up since it assumes subvolume qgroup's level to be 0. |
e09fe2d2 | 540 | */ |
49a3c4d9 DS |
541 | if (btrfs_qgroup_level(objectid)) { |
542 | ret = -ENOSPC; | |
543 | goto fail_free; | |
544 | } | |
e09fe2d2 | 545 | |
d5c12070 | 546 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 547 | /* |
d5c12070 MX |
548 | * The same as the snapshot creation, please see the comment |
549 | * of create_snapshot(). | |
9ed74f2d | 550 | */ |
c4c129db | 551 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false); |
d5c12070 | 552 | if (ret) |
49a3c4d9 | 553 | goto fail_free; |
d5c12070 MX |
554 | |
555 | trans = btrfs_start_transaction(root, 0); | |
556 | if (IS_ERR(trans)) { | |
557 | ret = PTR_ERR(trans); | |
e85fde51 | 558 | btrfs_subvolume_release_metadata(root, &block_rsv); |
49a3c4d9 | 559 | goto fail_free; |
d5c12070 MX |
560 | } |
561 | trans->block_rsv = &block_rsv; | |
562 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 563 | |
a9377422 | 564 | ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit); |
6f72c7e2 AJ |
565 | if (ret) |
566 | goto fail; | |
567 | ||
9631e4cc JB |
568 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, |
569 | BTRFS_NESTING_NORMAL); | |
8e8a1e31 JB |
570 | if (IS_ERR(leaf)) { |
571 | ret = PTR_ERR(leaf); | |
572 | goto fail; | |
573 | } | |
f46b5a66 | 574 | |
f46b5a66 CH |
575 | btrfs_mark_buffer_dirty(leaf); |
576 | ||
49a3c4d9 | 577 | inode_item = &root_item->inode; |
3cae210f QW |
578 | btrfs_set_stack_inode_generation(inode_item, 1); |
579 | btrfs_set_stack_inode_size(inode_item, 3); | |
580 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
da17066c | 581 | btrfs_set_stack_inode_nbytes(inode_item, |
0b246afa | 582 | fs_info->nodesize); |
3cae210f | 583 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 584 | |
49a3c4d9 DS |
585 | btrfs_set_root_flags(root_item, 0); |
586 | btrfs_set_root_limit(root_item, 0); | |
3cae210f | 587 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
08fe4db1 | 588 | |
49a3c4d9 DS |
589 | btrfs_set_root_bytenr(root_item, leaf->start); |
590 | btrfs_set_root_generation(root_item, trans->transid); | |
591 | btrfs_set_root_level(root_item, 0); | |
592 | btrfs_set_root_refs(root_item, 1); | |
593 | btrfs_set_root_used(root_item, leaf->len); | |
594 | btrfs_set_root_last_snapshot(root_item, 0); | |
f46b5a66 | 595 | |
49a3c4d9 DS |
596 | btrfs_set_root_generation_v2(root_item, |
597 | btrfs_root_generation(root_item)); | |
807fc790 | 598 | generate_random_guid(root_item->uuid); |
49a3c4d9 DS |
599 | btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec); |
600 | btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec); | |
601 | root_item->ctime = root_item->otime; | |
602 | btrfs_set_root_ctransid(root_item, trans->transid); | |
603 | btrfs_set_root_otransid(root_item, trans->transid); | |
f46b5a66 | 604 | |
925baedd | 605 | btrfs_tree_unlock(leaf); |
f46b5a66 | 606 | |
69948022 | 607 | btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID); |
f46b5a66 CH |
608 | |
609 | key.objectid = objectid; | |
5d4f98a2 | 610 | key.offset = 0; |
962a298f | 611 | key.type = BTRFS_ROOT_ITEM_KEY; |
0b246afa | 612 | ret = btrfs_insert_root(trans, fs_info->tree_root, &key, |
49a3c4d9 | 613 | root_item); |
67addf29 FM |
614 | if (ret) { |
615 | /* | |
616 | * Since we don't abort the transaction in this case, free the | |
617 | * tree block so that we don't leak space and leave the | |
618 | * filesystem in an inconsistent state (an extent item in the | |
619 | * extent tree without backreferences). Also no need to have | |
620 | * the tree block locked since it is not in any tree at this | |
621 | * point, so no other task can find it and use it. | |
622 | */ | |
623 | btrfs_free_tree_block(trans, root, leaf, 0, 1); | |
624 | free_extent_buffer(leaf); | |
f46b5a66 | 625 | goto fail; |
67addf29 FM |
626 | } |
627 | ||
628 | free_extent_buffer(leaf); | |
629 | leaf = NULL; | |
f46b5a66 | 630 | |
76dda93c | 631 | key.offset = (u64)-1; |
2dfb1e43 | 632 | new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev); |
79787eaa | 633 | if (IS_ERR(new_root)) { |
2dfb1e43 | 634 | free_anon_bdev(anon_dev); |
79787eaa | 635 | ret = PTR_ERR(new_root); |
66642832 | 636 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
637 | goto fail; |
638 | } | |
2dfb1e43 QW |
639 | /* Freeing will be done in btrfs_put_root() of new_root */ |
640 | anon_dev = 0; | |
76dda93c | 641 | |
221581e4 JB |
642 | ret = btrfs_record_root_in_trans(trans, new_root); |
643 | if (ret) { | |
644 | btrfs_put_root(new_root); | |
645 | btrfs_abort_transaction(trans, ret); | |
646 | goto fail; | |
647 | } | |
76dda93c | 648 | |
4d4340c9 | 649 | ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns); |
00246528 | 650 | btrfs_put_root(new_root); |
ce598979 MF |
651 | if (ret) { |
652 | /* We potentially lose an unused inode item here */ | |
66642832 | 653 | btrfs_abort_transaction(trans, ret); |
ce598979 MF |
654 | goto fail; |
655 | } | |
656 | ||
f46b5a66 CH |
657 | /* |
658 | * insert the directory item | |
659 | */ | |
877574e2 | 660 | ret = btrfs_set_inode_index(BTRFS_I(dir), &index); |
79787eaa | 661 | if (ret) { |
66642832 | 662 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
663 | goto fail; |
664 | } | |
3de4586c | 665 | |
684572df | 666 | ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key, |
3de4586c | 667 | BTRFS_FT_DIR, index); |
79787eaa | 668 | if (ret) { |
66642832 | 669 | btrfs_abort_transaction(trans, ret); |
f46b5a66 | 670 | goto fail; |
79787eaa | 671 | } |
0660b5af | 672 | |
6ef06d27 | 673 | btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2); |
9a56fcd1 | 674 | ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); |
c7e54b51 JB |
675 | if (ret) { |
676 | btrfs_abort_transaction(trans, ret); | |
677 | goto fail; | |
678 | } | |
52c26179 | 679 | |
6025c19f | 680 | ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid, |
4a0cc7ca | 681 | btrfs_ino(BTRFS_I(dir)), index, name, namelen); |
c7e54b51 JB |
682 | if (ret) { |
683 | btrfs_abort_transaction(trans, ret); | |
684 | goto fail; | |
685 | } | |
f46b5a66 | 686 | |
cdb345a8 | 687 | ret = btrfs_uuid_tree_add(trans, root_item->uuid, |
6bccf3ab | 688 | BTRFS_UUID_KEY_SUBVOL, objectid); |
dd5f9615 | 689 | if (ret) |
66642832 | 690 | btrfs_abort_transaction(trans, ret); |
dd5f9615 | 691 | |
f46b5a66 | 692 | fail: |
49a3c4d9 | 693 | kfree(root_item); |
d5c12070 MX |
694 | trans->block_rsv = NULL; |
695 | trans->bytes_reserved = 0; | |
e85fde51 | 696 | btrfs_subvolume_release_metadata(root, &block_rsv); |
de6e8200 | 697 | |
9babda9f | 698 | err = btrfs_commit_transaction(trans); |
f46b5a66 CH |
699 | if (err && !ret) |
700 | ret = err; | |
1a65e24b | 701 | |
5662344b TI |
702 | if (!ret) { |
703 | inode = btrfs_lookup_dentry(dir, dentry); | |
de6e8200 LB |
704 | if (IS_ERR(inode)) |
705 | return PTR_ERR(inode); | |
5662344b TI |
706 | d_instantiate(dentry, inode); |
707 | } | |
f46b5a66 | 708 | return ret; |
49a3c4d9 DS |
709 | |
710 | fail_free: | |
2dfb1e43 QW |
711 | if (anon_dev) |
712 | free_anon_bdev(anon_dev); | |
49a3c4d9 DS |
713 | kfree(root_item); |
714 | return ret; | |
f46b5a66 CH |
715 | } |
716 | ||
e9662f70 | 717 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
9babda9f | 718 | struct dentry *dentry, bool readonly, |
e9662f70 | 719 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 720 | { |
0b246afa | 721 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); |
2e4bfab9 | 722 | struct inode *inode; |
f46b5a66 CH |
723 | struct btrfs_pending_snapshot *pending_snapshot; |
724 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 725 | int ret; |
f46b5a66 | 726 | |
92a7cc42 | 727 | if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) |
f46b5a66 CH |
728 | return -EINVAL; |
729 | ||
eede2bf3 OS |
730 | if (atomic_read(&root->nr_swapfiles)) { |
731 | btrfs_warn(fs_info, | |
732 | "cannot snapshot subvolume with active swapfile"); | |
733 | return -ETXTBSY; | |
734 | } | |
735 | ||
23269bf5 | 736 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL); |
a1ee7362 DS |
737 | if (!pending_snapshot) |
738 | return -ENOMEM; | |
739 | ||
2dfb1e43 QW |
740 | ret = get_anon_bdev(&pending_snapshot->anon_dev); |
741 | if (ret < 0) | |
742 | goto free_pending; | |
b0c0ea63 | 743 | pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), |
23269bf5 | 744 | GFP_KERNEL); |
8546b570 DS |
745 | pending_snapshot->path = btrfs_alloc_path(); |
746 | if (!pending_snapshot->root_item || !pending_snapshot->path) { | |
b0c0ea63 DS |
747 | ret = -ENOMEM; |
748 | goto free_pending; | |
749 | } | |
750 | ||
66d8f3dd MX |
751 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
752 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
753 | /* |
754 | * 1 - parent dir inode | |
755 | * 2 - dir entries | |
756 | * 1 - root item | |
757 | * 2 - root ref/backref | |
758 | * 1 - root of snapshot | |
dd5f9615 | 759 | * 1 - UUID item |
d5c12070 MX |
760 | */ |
761 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 762 | &pending_snapshot->block_rsv, 8, |
ee3441b4 | 763 | false); |
d5c12070 | 764 | if (ret) |
c11fbb6e | 765 | goto free_pending; |
d5c12070 | 766 | |
3de4586c | 767 | pending_snapshot->dentry = dentry; |
f46b5a66 | 768 | pending_snapshot->root = root; |
b83cc969 | 769 | pending_snapshot->readonly = readonly; |
e9662f70 | 770 | pending_snapshot->dir = dir; |
8696c533 | 771 | pending_snapshot->inherit = inherit; |
a22285a6 | 772 | |
d5c12070 | 773 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
774 | if (IS_ERR(trans)) { |
775 | ret = PTR_ERR(trans); | |
776 | goto fail; | |
777 | } | |
778 | ||
0b246afa | 779 | spin_lock(&fs_info->trans_lock); |
f46b5a66 CH |
780 | list_add(&pending_snapshot->list, |
781 | &trans->transaction->pending_snapshots); | |
0b246afa | 782 | spin_unlock(&fs_info->trans_lock); |
9babda9f NB |
783 | |
784 | ret = btrfs_commit_transaction(trans); | |
aec8030a | 785 | if (ret) |
c37b2b62 | 786 | goto fail; |
a22285a6 YZ |
787 | |
788 | ret = pending_snapshot->error; | |
789 | if (ret) | |
790 | goto fail; | |
791 | ||
d3797308 CM |
792 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
793 | if (ret) | |
794 | goto fail; | |
795 | ||
2b0143b5 | 796 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
2e4bfab9 YZ |
797 | if (IS_ERR(inode)) { |
798 | ret = PTR_ERR(inode); | |
799 | goto fail; | |
800 | } | |
5662344b | 801 | |
2e4bfab9 YZ |
802 | d_instantiate(dentry, inode); |
803 | ret = 0; | |
2dfb1e43 | 804 | pending_snapshot->anon_dev = 0; |
2e4bfab9 | 805 | fail: |
2dfb1e43 QW |
806 | /* Prevent double freeing of anon_dev */ |
807 | if (ret && pending_snapshot->snap) | |
808 | pending_snapshot->snap->anon_dev = 0; | |
00246528 | 809 | btrfs_put_root(pending_snapshot->snap); |
e85fde51 | 810 | btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv); |
b0c0ea63 | 811 | free_pending: |
2dfb1e43 QW |
812 | if (pending_snapshot->anon_dev) |
813 | free_anon_bdev(pending_snapshot->anon_dev); | |
b0c0ea63 | 814 | kfree(pending_snapshot->root_item); |
8546b570 | 815 | btrfs_free_path(pending_snapshot->path); |
a1ee7362 DS |
816 | kfree(pending_snapshot); |
817 | ||
f46b5a66 CH |
818 | return ret; |
819 | } | |
820 | ||
4260f7c7 SW |
821 | /* copy of may_delete in fs/namei.c() |
822 | * Check whether we can remove a link victim from directory dir, check | |
823 | * whether the type of victim is right. | |
824 | * 1. We can't do it if dir is read-only (done in permission()) | |
825 | * 2. We should have write and exec permissions on dir | |
826 | * 3. We can't remove anything from append-only dir | |
827 | * 4. We can't do anything with immutable dir (done in permission()) | |
828 | * 5. If the sticky bit on dir is set we should either | |
829 | * a. be owner of dir, or | |
830 | * b. be owner of victim, or | |
831 | * c. have CAP_FOWNER capability | |
01327610 | 832 | * 6. If the victim is append-only or immutable we can't do anything with |
4260f7c7 SW |
833 | * links pointing to it. |
834 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
835 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
836 | * 9. We can't remove a root or mountpoint. | |
837 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
838 | * nfs_async_unlink(). | |
839 | */ | |
840 | ||
c4ed533b CB |
841 | static int btrfs_may_delete(struct user_namespace *mnt_userns, |
842 | struct inode *dir, struct dentry *victim, int isdir) | |
4260f7c7 SW |
843 | { |
844 | int error; | |
845 | ||
2b0143b5 | 846 | if (d_really_is_negative(victim)) |
4260f7c7 SW |
847 | return -ENOENT; |
848 | ||
2b0143b5 | 849 | BUG_ON(d_inode(victim->d_parent) != dir); |
4fa6b5ec | 850 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 | 851 | |
c4ed533b | 852 | error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); |
4260f7c7 SW |
853 | if (error) |
854 | return error; | |
855 | if (IS_APPEND(dir)) | |
856 | return -EPERM; | |
c4ed533b | 857 | if (check_sticky(mnt_userns, dir, d_inode(victim)) || |
ba73d987 CB |
858 | IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) || |
859 | IS_SWAPFILE(d_inode(victim))) | |
4260f7c7 SW |
860 | return -EPERM; |
861 | if (isdir) { | |
e36cb0b8 | 862 | if (!d_is_dir(victim)) |
4260f7c7 SW |
863 | return -ENOTDIR; |
864 | if (IS_ROOT(victim)) | |
865 | return -EBUSY; | |
e36cb0b8 | 866 | } else if (d_is_dir(victim)) |
4260f7c7 SW |
867 | return -EISDIR; |
868 | if (IS_DEADDIR(dir)) | |
869 | return -ENOENT; | |
870 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
871 | return -EBUSY; | |
872 | return 0; | |
873 | } | |
874 | ||
cb8e7090 | 875 | /* copy of may_create in fs/namei.c() */ |
4d4340c9 CB |
876 | static inline int btrfs_may_create(struct user_namespace *mnt_userns, |
877 | struct inode *dir, struct dentry *child) | |
cb8e7090 | 878 | { |
2b0143b5 | 879 | if (d_really_is_positive(child)) |
cb8e7090 CH |
880 | return -EEXIST; |
881 | if (IS_DEADDIR(dir)) | |
882 | return -ENOENT; | |
4d4340c9 | 883 | if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns)) |
5474bf40 | 884 | return -EOVERFLOW; |
4d4340c9 | 885 | return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC); |
cb8e7090 CH |
886 | } |
887 | ||
888 | /* | |
889 | * Create a new subvolume below @parent. This is largely modeled after | |
890 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
891 | * inside this filesystem so it's quite a bit simpler. | |
892 | */ | |
92872094 | 893 | static noinline int btrfs_mksubvol(const struct path *parent, |
4d4340c9 | 894 | struct user_namespace *mnt_userns, |
52f75f4f | 895 | const char *name, int namelen, |
72fd032e | 896 | struct btrfs_root *snap_src, |
9babda9f | 897 | bool readonly, |
8696c533 | 898 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 899 | { |
0b246afa JM |
900 | struct inode *dir = d_inode(parent->dentry); |
901 | struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb); | |
cb8e7090 CH |
902 | struct dentry *dentry; |
903 | int error; | |
904 | ||
00235411 AV |
905 | error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
906 | if (error == -EINTR) | |
907 | return error; | |
cb8e7090 | 908 | |
4d4340c9 | 909 | dentry = lookup_one(mnt_userns, name, parent->dentry, namelen); |
cb8e7090 CH |
910 | error = PTR_ERR(dentry); |
911 | if (IS_ERR(dentry)) | |
912 | goto out_unlock; | |
913 | ||
4d4340c9 | 914 | error = btrfs_may_create(mnt_userns, dir, dentry); |
cb8e7090 | 915 | if (error) |
a874a63e | 916 | goto out_dput; |
cb8e7090 | 917 | |
9c52057c CM |
918 | /* |
919 | * even if this name doesn't exist, we may get hash collisions. | |
920 | * check for them now when we can safely fail | |
921 | */ | |
922 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
923 | dir->i_ino, name, | |
924 | namelen); | |
925 | if (error) | |
926 | goto out_dput; | |
927 | ||
0b246afa | 928 | down_read(&fs_info->subvol_sem); |
76dda93c YZ |
929 | |
930 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
931 | goto out_up_read; | |
932 | ||
9babda9f NB |
933 | if (snap_src) |
934 | error = create_snapshot(snap_src, dir, dentry, readonly, inherit); | |
935 | else | |
4d4340c9 | 936 | error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit); |
9babda9f | 937 | |
76dda93c YZ |
938 | if (!error) |
939 | fsnotify_mkdir(dir, dentry); | |
940 | out_up_read: | |
0b246afa | 941 | up_read(&fs_info->subvol_sem); |
cb8e7090 CH |
942 | out_dput: |
943 | dput(dentry); | |
944 | out_unlock: | |
64708539 | 945 | btrfs_inode_unlock(dir, 0); |
cb8e7090 CH |
946 | return error; |
947 | } | |
948 | ||
c11fbb6e | 949 | static noinline int btrfs_mksnapshot(const struct path *parent, |
4d4340c9 | 950 | struct user_namespace *mnt_userns, |
c11fbb6e RK |
951 | const char *name, int namelen, |
952 | struct btrfs_root *root, | |
953 | bool readonly, | |
954 | struct btrfs_qgroup_inherit *inherit) | |
955 | { | |
956 | int ret; | |
957 | bool snapshot_force_cow = false; | |
958 | ||
959 | /* | |
960 | * Force new buffered writes to reserve space even when NOCOW is | |
961 | * possible. This is to avoid later writeback (running dealloc) to | |
962 | * fallback to COW mode and unexpectedly fail with ENOSPC. | |
963 | */ | |
964 | btrfs_drew_read_lock(&root->snapshot_lock); | |
965 | ||
f9baa501 | 966 | ret = btrfs_start_delalloc_snapshot(root, false); |
c11fbb6e RK |
967 | if (ret) |
968 | goto out; | |
969 | ||
970 | /* | |
971 | * All previous writes have started writeback in NOCOW mode, so now | |
972 | * we force future writes to fallback to COW mode during snapshot | |
973 | * creation. | |
974 | */ | |
975 | atomic_inc(&root->snapshot_force_cow); | |
976 | snapshot_force_cow = true; | |
977 | ||
978 | btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1); | |
979 | ||
4d4340c9 | 980 | ret = btrfs_mksubvol(parent, mnt_userns, name, namelen, |
c11fbb6e RK |
981 | root, readonly, inherit); |
982 | out: | |
983 | if (snapshot_force_cow) | |
984 | atomic_dec(&root->snapshot_force_cow); | |
985 | btrfs_drew_read_unlock(&root->snapshot_lock); | |
986 | return ret; | |
987 | } | |
988 | ||
e9eec721 QW |
989 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start, |
990 | bool locked) | |
17ce6ef8 LB |
991 | { |
992 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
993 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
994 | struct extent_map *em; | |
76068cae | 995 | const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize; |
17ce6ef8 | 996 | |
6c282eb4 LZ |
997 | /* |
998 | * hopefully we have this extent in the tree already, try without | |
999 | * the full extent lock | |
1000 | */ | |
17ce6ef8 | 1001 | read_lock(&em_tree->lock); |
76068cae | 1002 | em = lookup_extent_mapping(em_tree, start, sectorsize); |
17ce6ef8 LB |
1003 | read_unlock(&em_tree->lock); |
1004 | ||
6c282eb4 | 1005 | if (!em) { |
308d9800 | 1006 | struct extent_state *cached = NULL; |
76068cae | 1007 | u64 end = start + sectorsize - 1; |
308d9800 | 1008 | |
6c282eb4 | 1009 | /* get the big lock and read metadata off disk */ |
e9eec721 QW |
1010 | if (!locked) |
1011 | lock_extent_bits(io_tree, start, end, &cached); | |
76068cae | 1012 | em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, sectorsize); |
e9eec721 QW |
1013 | if (!locked) |
1014 | unlock_extent_cached(io_tree, start, end, &cached); | |
6c282eb4 LZ |
1015 | |
1016 | if (IS_ERR(em)) | |
1017 | return NULL; | |
1018 | } | |
1019 | ||
1020 | return em; | |
1021 | } | |
17ce6ef8 | 1022 | |
e9eec721 QW |
1023 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em, |
1024 | bool locked) | |
6c282eb4 LZ |
1025 | { |
1026 | struct extent_map *next; | |
1027 | bool ret = true; | |
1028 | ||
1029 | /* this is the last extent */ | |
1030 | if (em->start + em->len >= i_size_read(inode)) | |
1031 | return false; | |
1032 | ||
e9eec721 | 1033 | next = defrag_lookup_extent(inode, em->start + em->len, locked); |
e9512d72 CM |
1034 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) |
1035 | ret = false; | |
1036 | else if ((em->block_start + em->block_len == next->block_start) && | |
ee22184b | 1037 | (em->block_len > SZ_128K && next->block_len > SZ_128K)) |
6c282eb4 LZ |
1038 | ret = false; |
1039 | ||
1040 | free_extent_map(next); | |
17ce6ef8 LB |
1041 | return ret; |
1042 | } | |
1043 | ||
5767b50c QW |
1044 | /* |
1045 | * Prepare one page to be defragged. | |
1046 | * | |
1047 | * This will ensure: | |
1048 | * | |
1049 | * - Returned page is locked and has been set up properly. | |
1050 | * - No ordered extent exists in the page. | |
1051 | * - The page is uptodate. | |
1052 | * | |
1053 | * NOTE: Caller should also wait for page writeback after the cluster is | |
1054 | * prepared, here we don't do writeback wait for each page. | |
1055 | */ | |
1056 | static struct page *defrag_prepare_one_page(struct btrfs_inode *inode, | |
1057 | pgoff_t index) | |
1058 | { | |
1059 | struct address_space *mapping = inode->vfs_inode.i_mapping; | |
1060 | gfp_t mask = btrfs_alloc_write_mask(mapping); | |
1061 | u64 page_start = (u64)index << PAGE_SHIFT; | |
1062 | u64 page_end = page_start + PAGE_SIZE - 1; | |
1063 | struct extent_state *cached_state = NULL; | |
1064 | struct page *page; | |
1065 | int ret; | |
1066 | ||
1067 | again: | |
1068 | page = find_or_create_page(mapping, index, mask); | |
1069 | if (!page) | |
1070 | return ERR_PTR(-ENOMEM); | |
1071 | ||
1072 | ret = set_page_extent_mapped(page); | |
1073 | if (ret < 0) { | |
1074 | unlock_page(page); | |
1075 | put_page(page); | |
1076 | return ERR_PTR(ret); | |
1077 | } | |
1078 | ||
1079 | /* Wait for any existing ordered extent in the range */ | |
1080 | while (1) { | |
1081 | struct btrfs_ordered_extent *ordered; | |
1082 | ||
1083 | lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state); | |
1084 | ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE); | |
1085 | unlock_extent_cached(&inode->io_tree, page_start, page_end, | |
1086 | &cached_state); | |
1087 | if (!ordered) | |
1088 | break; | |
1089 | ||
1090 | unlock_page(page); | |
1091 | btrfs_start_ordered_extent(ordered, 1); | |
1092 | btrfs_put_ordered_extent(ordered); | |
1093 | lock_page(page); | |
1094 | /* | |
1095 | * We unlocked the page above, so we need check if it was | |
1096 | * released or not. | |
1097 | */ | |
1098 | if (page->mapping != mapping || !PagePrivate(page)) { | |
1099 | unlock_page(page); | |
1100 | put_page(page); | |
1101 | goto again; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Now the page range has no ordered extent any more. Read the page to | |
1107 | * make it uptodate. | |
1108 | */ | |
1109 | if (!PageUptodate(page)) { | |
1110 | btrfs_readpage(NULL, page); | |
1111 | lock_page(page); | |
1112 | if (page->mapping != mapping || !PagePrivate(page)) { | |
1113 | unlock_page(page); | |
1114 | put_page(page); | |
1115 | goto again; | |
1116 | } | |
1117 | if (!PageUptodate(page)) { | |
1118 | unlock_page(page); | |
1119 | put_page(page); | |
1120 | return ERR_PTR(-EIO); | |
1121 | } | |
1122 | } | |
1123 | return page; | |
1124 | } | |
1125 | ||
eb793cf8 QW |
1126 | struct defrag_target_range { |
1127 | struct list_head list; | |
1128 | u64 start; | |
1129 | u64 len; | |
1130 | }; | |
1131 | ||
1132 | /* | |
1133 | * Collect all valid target extents. | |
1134 | * | |
1135 | * @start: file offset to lookup | |
1136 | * @len: length to lookup | |
1137 | * @extent_thresh: file extent size threshold, any extent size >= this value | |
1138 | * will be ignored | |
1139 | * @newer_than: only defrag extents newer than this value | |
1140 | * @do_compress: whether the defrag is doing compression | |
1141 | * if true, @extent_thresh will be ignored and all regular | |
1142 | * file extents meeting @newer_than will be targets. | |
e9eec721 | 1143 | * @locked: if the range has already held extent lock |
eb793cf8 QW |
1144 | * @target_list: list of targets file extents |
1145 | */ | |
1146 | static int defrag_collect_targets(struct btrfs_inode *inode, | |
1147 | u64 start, u64 len, u32 extent_thresh, | |
1148 | u64 newer_than, bool do_compress, | |
e9eec721 | 1149 | bool locked, struct list_head *target_list) |
eb793cf8 QW |
1150 | { |
1151 | u64 cur = start; | |
1152 | int ret = 0; | |
1153 | ||
1154 | while (cur < start + len) { | |
1155 | struct extent_map *em; | |
1156 | struct defrag_target_range *new; | |
1157 | bool next_mergeable = true; | |
1158 | u64 range_len; | |
1159 | ||
e9eec721 | 1160 | em = defrag_lookup_extent(&inode->vfs_inode, cur, locked); |
eb793cf8 QW |
1161 | if (!em) |
1162 | break; | |
1163 | ||
1164 | /* Skip hole/inline/preallocated extents */ | |
1165 | if (em->block_start >= EXTENT_MAP_LAST_BYTE || | |
1166 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
1167 | goto next; | |
1168 | ||
1169 | /* Skip older extent */ | |
1170 | if (em->generation < newer_than) | |
1171 | goto next; | |
1172 | ||
1173 | /* | |
1174 | * For do_compress case, we want to compress all valid file | |
1175 | * extents, thus no @extent_thresh or mergeable check. | |
1176 | */ | |
1177 | if (do_compress) | |
1178 | goto add; | |
1179 | ||
1180 | /* Skip too large extent */ | |
1181 | if (em->len >= extent_thresh) | |
1182 | goto next; | |
1183 | ||
e9eec721 QW |
1184 | next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em, |
1185 | locked); | |
eb793cf8 QW |
1186 | if (!next_mergeable) { |
1187 | struct defrag_target_range *last; | |
1188 | ||
1189 | /* Empty target list, no way to merge with last entry */ | |
1190 | if (list_empty(target_list)) | |
1191 | goto next; | |
1192 | last = list_entry(target_list->prev, | |
1193 | struct defrag_target_range, list); | |
1194 | /* Not mergeable with last entry */ | |
1195 | if (last->start + last->len != cur) | |
1196 | goto next; | |
1197 | ||
1198 | /* Mergeable, fall through to add it to @target_list. */ | |
1199 | } | |
1200 | ||
1201 | add: | |
1202 | range_len = min(extent_map_end(em), start + len) - cur; | |
1203 | /* | |
1204 | * This one is a good target, check if it can be merged into | |
1205 | * last range of the target list. | |
1206 | */ | |
1207 | if (!list_empty(target_list)) { | |
1208 | struct defrag_target_range *last; | |
1209 | ||
1210 | last = list_entry(target_list->prev, | |
1211 | struct defrag_target_range, list); | |
1212 | ASSERT(last->start + last->len <= cur); | |
1213 | if (last->start + last->len == cur) { | |
1214 | /* Mergeable, enlarge the last entry */ | |
1215 | last->len += range_len; | |
1216 | goto next; | |
1217 | } | |
1218 | /* Fall through to allocate a new entry */ | |
1219 | } | |
1220 | ||
1221 | /* Allocate new defrag_target_range */ | |
1222 | new = kmalloc(sizeof(*new), GFP_NOFS); | |
1223 | if (!new) { | |
1224 | free_extent_map(em); | |
1225 | ret = -ENOMEM; | |
1226 | break; | |
1227 | } | |
1228 | new->start = cur; | |
1229 | new->len = range_len; | |
1230 | list_add_tail(&new->list, target_list); | |
1231 | ||
1232 | next: | |
1233 | cur = extent_map_end(em); | |
1234 | free_extent_map(em); | |
1235 | } | |
1236 | if (ret < 0) { | |
1237 | struct defrag_target_range *entry; | |
1238 | struct defrag_target_range *tmp; | |
1239 | ||
1240 | list_for_each_entry_safe(entry, tmp, target_list, list) { | |
1241 | list_del_init(&entry->list); | |
1242 | kfree(entry); | |
1243 | } | |
1244 | } | |
1245 | return ret; | |
1246 | } | |
1247 | ||
22b398ee QW |
1248 | #define CLUSTER_SIZE (SZ_256K) |
1249 | ||
1250 | /* | |
1251 | * Defrag one contiguous target range. | |
1252 | * | |
1253 | * @inode: target inode | |
1254 | * @target: target range to defrag | |
1255 | * @pages: locked pages covering the defrag range | |
1256 | * @nr_pages: number of locked pages | |
1257 | * | |
1258 | * Caller should ensure: | |
1259 | * | |
1260 | * - Pages are prepared | |
1261 | * Pages should be locked, no ordered extent in the pages range, | |
1262 | * no writeback. | |
1263 | * | |
1264 | * - Extent bits are locked | |
1265 | */ | |
1266 | static int defrag_one_locked_target(struct btrfs_inode *inode, | |
1267 | struct defrag_target_range *target, | |
1268 | struct page **pages, int nr_pages, | |
1269 | struct extent_state **cached_state) | |
1270 | { | |
1271 | struct btrfs_fs_info *fs_info = inode->root->fs_info; | |
1272 | struct extent_changeset *data_reserved = NULL; | |
1273 | const u64 start = target->start; | |
1274 | const u64 len = target->len; | |
1275 | unsigned long last_index = (start + len - 1) >> PAGE_SHIFT; | |
1276 | unsigned long start_index = start >> PAGE_SHIFT; | |
1277 | unsigned long first_index = page_index(pages[0]); | |
1278 | int ret = 0; | |
1279 | int i; | |
1280 | ||
1281 | ASSERT(last_index - first_index + 1 <= nr_pages); | |
1282 | ||
1283 | ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len); | |
1284 | if (ret < 0) | |
1285 | return ret; | |
1286 | clear_extent_bit(&inode->io_tree, start, start + len - 1, | |
1287 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
1288 | EXTENT_DEFRAG, 0, 0, cached_state); | |
1289 | set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state); | |
1290 | ||
1291 | /* Update the page status */ | |
1292 | for (i = start_index - first_index; i <= last_index - first_index; i++) { | |
1293 | ClearPageChecked(pages[i]); | |
1294 | btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len); | |
1295 | } | |
1296 | btrfs_delalloc_release_extents(inode, len); | |
1297 | extent_changeset_free(data_reserved); | |
1298 | ||
1299 | return ret; | |
1300 | } | |
1301 | ||
e9eec721 QW |
1302 | static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len, |
1303 | u32 extent_thresh, u64 newer_than, bool do_compress) | |
1304 | { | |
1305 | struct extent_state *cached_state = NULL; | |
1306 | struct defrag_target_range *entry; | |
1307 | struct defrag_target_range *tmp; | |
1308 | LIST_HEAD(target_list); | |
1309 | struct page **pages; | |
1310 | const u32 sectorsize = inode->root->fs_info->sectorsize; | |
1311 | u64 last_index = (start + len - 1) >> PAGE_SHIFT; | |
1312 | u64 start_index = start >> PAGE_SHIFT; | |
1313 | unsigned int nr_pages = last_index - start_index + 1; | |
1314 | int ret = 0; | |
1315 | int i; | |
1316 | ||
1317 | ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE); | |
1318 | ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize)); | |
1319 | ||
1320 | pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); | |
1321 | if (!pages) | |
1322 | return -ENOMEM; | |
1323 | ||
1324 | /* Prepare all pages */ | |
1325 | for (i = 0; i < nr_pages; i++) { | |
1326 | pages[i] = defrag_prepare_one_page(inode, start_index + i); | |
1327 | if (IS_ERR(pages[i])) { | |
1328 | ret = PTR_ERR(pages[i]); | |
1329 | pages[i] = NULL; | |
1330 | goto free_pages; | |
1331 | } | |
1332 | } | |
1333 | for (i = 0; i < nr_pages; i++) | |
1334 | wait_on_page_writeback(pages[i]); | |
1335 | ||
1336 | /* Lock the pages range */ | |
1337 | lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT, | |
1338 | (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, | |
1339 | &cached_state); | |
1340 | /* | |
1341 | * Now we have a consistent view about the extent map, re-check | |
1342 | * which range really needs to be defragged. | |
1343 | * | |
1344 | * And this time we have extent locked already, pass @locked = true | |
1345 | * so that we won't relock the extent range and cause deadlock. | |
1346 | */ | |
1347 | ret = defrag_collect_targets(inode, start, len, extent_thresh, | |
1348 | newer_than, do_compress, true, | |
1349 | &target_list); | |
1350 | if (ret < 0) | |
1351 | goto unlock_extent; | |
1352 | ||
1353 | list_for_each_entry(entry, &target_list, list) { | |
1354 | ret = defrag_one_locked_target(inode, entry, pages, nr_pages, | |
1355 | &cached_state); | |
1356 | if (ret < 0) | |
1357 | break; | |
1358 | } | |
1359 | ||
1360 | list_for_each_entry_safe(entry, tmp, &target_list, list) { | |
1361 | list_del_init(&entry->list); | |
1362 | kfree(entry); | |
1363 | } | |
1364 | unlock_extent: | |
1365 | unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT, | |
1366 | (last_index << PAGE_SHIFT) + PAGE_SIZE - 1, | |
1367 | &cached_state); | |
1368 | free_pages: | |
1369 | for (i = 0; i < nr_pages; i++) { | |
1370 | if (pages[i]) { | |
1371 | unlock_page(pages[i]); | |
1372 | put_page(pages[i]); | |
1373 | } | |
1374 | } | |
1375 | kfree(pages); | |
1376 | return ret; | |
1377 | } | |
1378 | ||
b18c3ab2 QW |
1379 | static int defrag_one_cluster(struct btrfs_inode *inode, |
1380 | struct file_ra_state *ra, | |
1381 | u64 start, u32 len, u32 extent_thresh, | |
1382 | u64 newer_than, bool do_compress, | |
1383 | unsigned long *sectors_defragged, | |
1384 | unsigned long max_sectors) | |
1385 | { | |
1386 | const u32 sectorsize = inode->root->fs_info->sectorsize; | |
1387 | struct defrag_target_range *entry; | |
1388 | struct defrag_target_range *tmp; | |
1389 | LIST_HEAD(target_list); | |
1390 | int ret; | |
1391 | ||
1392 | BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); | |
1393 | ret = defrag_collect_targets(inode, start, len, extent_thresh, | |
1394 | newer_than, do_compress, false, | |
1395 | &target_list); | |
1396 | if (ret < 0) | |
1397 | goto out; | |
1398 | ||
1399 | list_for_each_entry(entry, &target_list, list) { | |
1400 | u32 range_len = entry->len; | |
1401 | ||
1402 | /* Reached the limit */ | |
1403 | if (max_sectors && max_sectors == *sectors_defragged) | |
1404 | break; | |
1405 | ||
1406 | if (max_sectors) | |
1407 | range_len = min_t(u32, range_len, | |
1408 | (max_sectors - *sectors_defragged) * sectorsize); | |
1409 | ||
1410 | if (ra) | |
1411 | page_cache_sync_readahead(inode->vfs_inode.i_mapping, | |
1412 | ra, NULL, entry->start >> PAGE_SHIFT, | |
1413 | ((entry->start + range_len - 1) >> PAGE_SHIFT) - | |
1414 | (entry->start >> PAGE_SHIFT) + 1); | |
1415 | /* | |
1416 | * Here we may not defrag any range if holes are punched before | |
1417 | * we locked the pages. | |
1418 | * But that's fine, it only affects the @sectors_defragged | |
1419 | * accounting. | |
1420 | */ | |
1421 | ret = defrag_one_range(inode, entry->start, range_len, | |
1422 | extent_thresh, newer_than, do_compress); | |
1423 | if (ret < 0) | |
1424 | break; | |
1425 | *sectors_defragged += range_len; | |
1426 | } | |
1427 | out: | |
1428 | list_for_each_entry_safe(entry, tmp, &target_list, list) { | |
1429 | list_del_init(&entry->list); | |
1430 | kfree(entry); | |
1431 | } | |
1432 | return ret; | |
1433 | } | |
1434 | ||
1ccc2e8a QW |
1435 | /* |
1436 | * Entry point to file defragmentation. | |
1437 | * | |
1438 | * @inode: inode to be defragged | |
1439 | * @ra: readahead state (can be NUL) | |
1440 | * @range: defrag options including range and flags | |
1441 | * @newer_than: minimum transid to defrag | |
1442 | * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode | |
1443 | * will be defragged. | |
1444 | */ | |
1445 | int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra, | |
4cb5300b CM |
1446 | struct btrfs_ioctl_defrag_range_args *range, |
1447 | u64 newer_than, unsigned long max_to_defrag) | |
1448 | { | |
0b246afa | 1449 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
7b508037 | 1450 | unsigned long sectors_defragged = 0; |
151a31b2 | 1451 | u64 isize = i_size_read(inode); |
7b508037 QW |
1452 | u64 cur; |
1453 | u64 last_byte; | |
1e2ef46d | 1454 | bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS; |
1ccc2e8a | 1455 | bool ra_allocated = false; |
7b508037 QW |
1456 | int compress_type = BTRFS_COMPRESS_ZLIB; |
1457 | int ret = 0; | |
1458 | u32 extent_thresh = range->extent_thresh; | |
4cb5300b | 1459 | |
0abd5b17 LB |
1460 | if (isize == 0) |
1461 | return 0; | |
1462 | ||
1463 | if (range->start >= isize) | |
1464 | return -EINVAL; | |
1a419d85 | 1465 | |
1e2ef46d | 1466 | if (do_compress) { |
ce96b7ff | 1467 | if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES) |
1a419d85 LZ |
1468 | return -EINVAL; |
1469 | if (range->compress_type) | |
1470 | compress_type = range->compress_type; | |
1471 | } | |
f46b5a66 | 1472 | |
0abd5b17 | 1473 | if (extent_thresh == 0) |
ee22184b | 1474 | extent_thresh = SZ_256K; |
940100a4 | 1475 | |
7b508037 QW |
1476 | if (range->start + range->len > range->start) { |
1477 | /* Got a specific range */ | |
1478 | last_byte = min(isize, range->start + range->len) - 1; | |
1479 | } else { | |
1480 | /* Defrag until file end */ | |
1481 | last_byte = isize - 1; | |
1482 | } | |
1483 | ||
4cb5300b | 1484 | /* |
1ccc2e8a | 1485 | * If we were not given a ra, allocate a readahead context. As |
0a52d108 DS |
1486 | * readahead is just an optimization, defrag will work without it so |
1487 | * we don't error out. | |
4cb5300b | 1488 | */ |
1ccc2e8a QW |
1489 | if (!ra) { |
1490 | ra_allocated = true; | |
63e727ec | 1491 | ra = kzalloc(sizeof(*ra), GFP_KERNEL); |
0a52d108 DS |
1492 | if (ra) |
1493 | file_ra_state_init(ra, inode->i_mapping); | |
4cb5300b CM |
1494 | } |
1495 | ||
7b508037 QW |
1496 | /* Align the range */ |
1497 | cur = round_down(range->start, fs_info->sectorsize); | |
1498 | last_byte = round_up(last_byte, fs_info->sectorsize) - 1; | |
210549eb | 1499 | |
7b508037 QW |
1500 | while (cur < last_byte) { |
1501 | u64 cluster_end; | |
008873ea | 1502 | |
7b508037 QW |
1503 | /* The cluster size 256K should always be page aligned */ |
1504 | BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE)); | |
008873ea | 1505 | |
7b508037 QW |
1506 | /* We want the cluster end at page boundary when possible */ |
1507 | cluster_end = (((cur >> PAGE_SHIFT) + | |
1508 | (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1; | |
1509 | cluster_end = min(cluster_end, last_byte); | |
940100a4 | 1510 | |
64708539 | 1511 | btrfs_inode_lock(inode, 0); |
eede2bf3 OS |
1512 | if (IS_SWAPFILE(inode)) { |
1513 | ret = -ETXTBSY; | |
7b508037 QW |
1514 | btrfs_inode_unlock(inode, 0); |
1515 | break; | |
eede2bf3 | 1516 | } |
7b508037 | 1517 | if (!(inode->i_sb->s_flags & SB_ACTIVE)) { |
64708539 | 1518 | btrfs_inode_unlock(inode, 0); |
7b508037 | 1519 | break; |
ecb8bea8 | 1520 | } |
7b508037 QW |
1521 | if (do_compress) |
1522 | BTRFS_I(inode)->defrag_compress = compress_type; | |
1523 | ret = defrag_one_cluster(BTRFS_I(inode), ra, cur, | |
1524 | cluster_end + 1 - cur, extent_thresh, | |
1525 | newer_than, do_compress, | |
1526 | §ors_defragged, max_to_defrag); | |
64708539 | 1527 | btrfs_inode_unlock(inode, 0); |
7b508037 QW |
1528 | if (ret < 0) |
1529 | break; | |
1530 | cur = cluster_end + 1; | |
f46b5a66 CH |
1531 | } |
1532 | ||
7b508037 QW |
1533 | if (ra_allocated) |
1534 | kfree(ra); | |
1535 | if (sectors_defragged) { | |
1536 | /* | |
1537 | * We have defragged some sectors, for compression case they | |
1538 | * need to be written back immediately. | |
1539 | */ | |
1540 | if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) { | |
dec8ef90 | 1541 | filemap_flush(inode->i_mapping); |
7b508037 QW |
1542 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
1543 | &BTRFS_I(inode)->runtime_flags)) | |
1544 | filemap_flush(inode->i_mapping); | |
1545 | } | |
1546 | if (range->compress_type == BTRFS_COMPRESS_LZO) | |
1547 | btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); | |
1548 | else if (range->compress_type == BTRFS_COMPRESS_ZSTD) | |
1549 | btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); | |
1550 | ret = sectors_defragged; | |
dec8ef90 | 1551 | } |
1e2ef46d | 1552 | if (do_compress) { |
64708539 | 1553 | btrfs_inode_lock(inode, 0); |
eec63c65 | 1554 | BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE; |
64708539 | 1555 | btrfs_inode_unlock(inode, 0); |
633085c7 | 1556 | } |
940100a4 | 1557 | return ret; |
f46b5a66 CH |
1558 | } |
1559 | ||
17aaa434 DS |
1560 | /* |
1561 | * Try to start exclusive operation @type or cancel it if it's running. | |
1562 | * | |
1563 | * Return: | |
1564 | * 0 - normal mode, newly claimed op started | |
1565 | * >0 - normal mode, something else is running, | |
1566 | * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space | |
1567 | * ECANCELED - cancel mode, successful cancel | |
1568 | * ENOTCONN - cancel mode, operation not running anymore | |
1569 | */ | |
1570 | static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info, | |
1571 | enum btrfs_exclusive_operation type, bool cancel) | |
1572 | { | |
1573 | if (!cancel) { | |
1574 | /* Start normal op */ | |
1575 | if (!btrfs_exclop_start(fs_info, type)) | |
1576 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
1577 | /* Exclusive operation is now claimed */ | |
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | /* Cancel running op */ | |
1582 | if (btrfs_exclop_start_try_lock(fs_info, type)) { | |
1583 | /* | |
1584 | * This blocks any exclop finish from setting it to NONE, so we | |
1585 | * request cancellation. Either it runs and we will wait for it, | |
1586 | * or it has finished and no waiting will happen. | |
1587 | */ | |
1588 | atomic_inc(&fs_info->reloc_cancel_req); | |
1589 | btrfs_exclop_start_unlock(fs_info); | |
1590 | ||
1591 | if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags)) | |
1592 | wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING, | |
1593 | TASK_INTERRUPTIBLE); | |
1594 | ||
1595 | return -ECANCELED; | |
1596 | } | |
1597 | ||
1598 | /* Something else is running or none */ | |
1599 | return -ENOTCONN; | |
1600 | } | |
1601 | ||
198605a8 | 1602 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1603 | void __user *arg) |
f46b5a66 | 1604 | { |
562d7b15 | 1605 | BTRFS_DEV_LOOKUP_ARGS(args); |
0b246afa JM |
1606 | struct inode *inode = file_inode(file); |
1607 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f46b5a66 CH |
1608 | u64 new_size; |
1609 | u64 old_size; | |
1610 | u64 devid = 1; | |
0b246afa | 1611 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f46b5a66 CH |
1612 | struct btrfs_ioctl_vol_args *vol_args; |
1613 | struct btrfs_trans_handle *trans; | |
1614 | struct btrfs_device *device = NULL; | |
1615 | char *sizestr; | |
9a40f122 | 1616 | char *retptr; |
f46b5a66 CH |
1617 | char *devstr = NULL; |
1618 | int ret = 0; | |
f46b5a66 | 1619 | int mod = 0; |
bb059a37 | 1620 | bool cancel; |
f46b5a66 | 1621 | |
e441d54d CM |
1622 | if (!capable(CAP_SYS_ADMIN)) |
1623 | return -EPERM; | |
1624 | ||
198605a8 MX |
1625 | ret = mnt_want_write_file(file); |
1626 | if (ret) | |
1627 | return ret; | |
1628 | ||
bb059a37 DS |
1629 | /* |
1630 | * Read the arguments before checking exclusivity to be able to | |
1631 | * distinguish regular resize and cancel | |
1632 | */ | |
dae7b665 | 1633 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1634 | if (IS_ERR(vol_args)) { |
1635 | ret = PTR_ERR(vol_args); | |
bb059a37 | 1636 | goto out_drop; |
c9e9f97b | 1637 | } |
5516e595 | 1638 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 1639 | sizestr = vol_args->name; |
bb059a37 DS |
1640 | cancel = (strcmp("cancel", sizestr) == 0); |
1641 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel); | |
1642 | if (ret) | |
1643 | goto out_free; | |
1644 | /* Exclusive operation is now claimed */ | |
1645 | ||
f46b5a66 CH |
1646 | devstr = strchr(sizestr, ':'); |
1647 | if (devstr) { | |
f46b5a66 CH |
1648 | sizestr = devstr + 1; |
1649 | *devstr = '\0'; | |
1650 | devstr = vol_args->name; | |
58dfae63 Z |
1651 | ret = kstrtoull(devstr, 10, &devid); |
1652 | if (ret) | |
bb059a37 | 1653 | goto out_finish; |
dfd79829 MX |
1654 | if (!devid) { |
1655 | ret = -EINVAL; | |
bb059a37 | 1656 | goto out_finish; |
dfd79829 | 1657 | } |
0b246afa | 1658 | btrfs_info(fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1659 | } |
dba60f3f | 1660 | |
562d7b15 JB |
1661 | args.devid = devid; |
1662 | device = btrfs_find_device(fs_info->fs_devices, &args); | |
f46b5a66 | 1663 | if (!device) { |
0b246afa JM |
1664 | btrfs_info(fs_info, "resizer unable to find device %llu", |
1665 | devid); | |
dfd79829 | 1666 | ret = -ENODEV; |
bb059a37 | 1667 | goto out_finish; |
f46b5a66 | 1668 | } |
dba60f3f | 1669 | |
ebbede42 | 1670 | if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) { |
0b246afa | 1671 | btrfs_info(fs_info, |
efe120a0 | 1672 | "resizer unable to apply on readonly device %llu", |
c1c9ff7c | 1673 | devid); |
dfd79829 | 1674 | ret = -EPERM; |
bb059a37 | 1675 | goto out_finish; |
4e42ae1b LB |
1676 | } |
1677 | ||
f46b5a66 CH |
1678 | if (!strcmp(sizestr, "max")) |
1679 | new_size = device->bdev->bd_inode->i_size; | |
1680 | else { | |
1681 | if (sizestr[0] == '-') { | |
1682 | mod = -1; | |
1683 | sizestr++; | |
1684 | } else if (sizestr[0] == '+') { | |
1685 | mod = 1; | |
1686 | sizestr++; | |
1687 | } | |
9a40f122 GH |
1688 | new_size = memparse(sizestr, &retptr); |
1689 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1690 | ret = -EINVAL; |
bb059a37 | 1691 | goto out_finish; |
f46b5a66 CH |
1692 | } |
1693 | } | |
1694 | ||
401e29c1 | 1695 | if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) { |
dfd79829 | 1696 | ret = -EPERM; |
bb059a37 | 1697 | goto out_finish; |
63a212ab SB |
1698 | } |
1699 | ||
7cc8e58d | 1700 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1701 | |
1702 | if (mod < 0) { | |
1703 | if (new_size > old_size) { | |
1704 | ret = -EINVAL; | |
bb059a37 | 1705 | goto out_finish; |
f46b5a66 CH |
1706 | } |
1707 | new_size = old_size - new_size; | |
1708 | } else if (mod > 0) { | |
eb8052e0 | 1709 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1710 | ret = -ERANGE; |
bb059a37 | 1711 | goto out_finish; |
eb8052e0 | 1712 | } |
f46b5a66 CH |
1713 | new_size = old_size + new_size; |
1714 | } | |
1715 | ||
ee22184b | 1716 | if (new_size < SZ_256M) { |
f46b5a66 | 1717 | ret = -EINVAL; |
bb059a37 | 1718 | goto out_finish; |
f46b5a66 CH |
1719 | } |
1720 | if (new_size > device->bdev->bd_inode->i_size) { | |
1721 | ret = -EFBIG; | |
bb059a37 | 1722 | goto out_finish; |
f46b5a66 CH |
1723 | } |
1724 | ||
47f08b96 | 1725 | new_size = round_down(new_size, fs_info->sectorsize); |
f46b5a66 | 1726 | |
f46b5a66 | 1727 | if (new_size > old_size) { |
a22285a6 | 1728 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1729 | if (IS_ERR(trans)) { |
1730 | ret = PTR_ERR(trans); | |
bb059a37 | 1731 | goto out_finish; |
98d5dc13 | 1732 | } |
f46b5a66 | 1733 | ret = btrfs_grow_device(trans, device, new_size); |
3a45bb20 | 1734 | btrfs_commit_transaction(trans); |
ece7d20e | 1735 | } else if (new_size < old_size) { |
f46b5a66 | 1736 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1737 | } /* equal, nothing need to do */ |
f46b5a66 | 1738 | |
faf8f7b9 MPS |
1739 | if (ret == 0 && new_size != old_size) |
1740 | btrfs_info_in_rcu(fs_info, | |
1741 | "resize device %s (devid %llu) from %llu to %llu", | |
1742 | rcu_str_deref(device->name), device->devid, | |
1743 | old_size, new_size); | |
bb059a37 DS |
1744 | out_finish: |
1745 | btrfs_exclop_finish(fs_info); | |
c9e9f97b | 1746 | out_free: |
f46b5a66 | 1747 | kfree(vol_args); |
bb059a37 | 1748 | out_drop: |
18f39c41 | 1749 | mnt_drop_write_file(file); |
f46b5a66 CH |
1750 | return ret; |
1751 | } | |
1752 | ||
5d54c67e | 1753 | static noinline int __btrfs_ioctl_snap_create(struct file *file, |
4d4340c9 | 1754 | struct user_namespace *mnt_userns, |
52f75f4f | 1755 | const char *name, unsigned long fd, int subvol, |
5d54c67e | 1756 | bool readonly, |
8696c533 | 1757 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1758 | { |
f46b5a66 | 1759 | int namelen; |
3de4586c | 1760 | int ret = 0; |
f46b5a66 | 1761 | |
325c50e3 JM |
1762 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1763 | return -ENOTDIR; | |
1764 | ||
a874a63e LB |
1765 | ret = mnt_want_write_file(file); |
1766 | if (ret) | |
1767 | goto out; | |
1768 | ||
72fd032e SW |
1769 | namelen = strlen(name); |
1770 | if (strchr(name, '/')) { | |
f46b5a66 | 1771 | ret = -EINVAL; |
a874a63e | 1772 | goto out_drop_write; |
f46b5a66 CH |
1773 | } |
1774 | ||
16780cab CM |
1775 | if (name[0] == '.' && |
1776 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1777 | ret = -EEXIST; | |
a874a63e | 1778 | goto out_drop_write; |
16780cab CM |
1779 | } |
1780 | ||
3de4586c | 1781 | if (subvol) { |
4d4340c9 CB |
1782 | ret = btrfs_mksubvol(&file->f_path, mnt_userns, name, |
1783 | namelen, NULL, readonly, inherit); | |
cb8e7090 | 1784 | } else { |
2903ff01 | 1785 | struct fd src = fdget(fd); |
3de4586c | 1786 | struct inode *src_inode; |
2903ff01 | 1787 | if (!src.file) { |
3de4586c | 1788 | ret = -EINVAL; |
a874a63e | 1789 | goto out_drop_write; |
3de4586c CM |
1790 | } |
1791 | ||
496ad9aa AV |
1792 | src_inode = file_inode(src.file); |
1793 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
c79b4713 | 1794 | btrfs_info(BTRFS_I(file_inode(file))->root->fs_info, |
efe120a0 | 1795 | "Snapshot src from another FS"); |
23ad5b17 | 1796 | ret = -EXDEV; |
4d4340c9 | 1797 | } else if (!inode_owner_or_capable(mnt_userns, src_inode)) { |
d0242061 DS |
1798 | /* |
1799 | * Subvolume creation is not restricted, but snapshots | |
1800 | * are limited to own subvolumes only | |
1801 | */ | |
1802 | ret = -EPERM; | |
ecd18815 | 1803 | } else { |
4d4340c9 CB |
1804 | ret = btrfs_mksnapshot(&file->f_path, mnt_userns, |
1805 | name, namelen, | |
1806 | BTRFS_I(src_inode)->root, | |
1807 | readonly, inherit); | |
3de4586c | 1808 | } |
2903ff01 | 1809 | fdput(src); |
cb8e7090 | 1810 | } |
a874a63e LB |
1811 | out_drop_write: |
1812 | mnt_drop_write_file(file); | |
f46b5a66 | 1813 | out: |
72fd032e SW |
1814 | return ret; |
1815 | } | |
1816 | ||
1817 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1818 | void __user *arg, int subvol) |
72fd032e | 1819 | { |
fa0d2b9b | 1820 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1821 | int ret; |
1822 | ||
325c50e3 JM |
1823 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1824 | return -ENOTDIR; | |
1825 | ||
fa0d2b9b LZ |
1826 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1827 | if (IS_ERR(vol_args)) | |
1828 | return PTR_ERR(vol_args); | |
1829 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1830 | |
4d4340c9 CB |
1831 | ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), |
1832 | vol_args->name, vol_args->fd, subvol, | |
1833 | false, NULL); | |
fdfb1e4f | 1834 | |
fa0d2b9b LZ |
1835 | kfree(vol_args); |
1836 | return ret; | |
1837 | } | |
fdfb1e4f | 1838 | |
fa0d2b9b LZ |
1839 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1840 | void __user *arg, int subvol) | |
1841 | { | |
1842 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1843 | int ret; | |
b83cc969 | 1844 | bool readonly = false; |
6f72c7e2 | 1845 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1846 | |
325c50e3 JM |
1847 | if (!S_ISDIR(file_inode(file)->i_mode)) |
1848 | return -ENOTDIR; | |
1849 | ||
fa0d2b9b LZ |
1850 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1851 | if (IS_ERR(vol_args)) | |
1852 | return PTR_ERR(vol_args); | |
1853 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1854 | |
673990db | 1855 | if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) { |
b83cc969 | 1856 | ret = -EOPNOTSUPP; |
c47ca32d | 1857 | goto free_args; |
72fd032e | 1858 | } |
fa0d2b9b | 1859 | |
b83cc969 LZ |
1860 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1861 | readonly = true; | |
6f72c7e2 | 1862 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
5011c5a6 DC |
1863 | u64 nums; |
1864 | ||
1865 | if (vol_args->size < sizeof(*inherit) || | |
1866 | vol_args->size > PAGE_SIZE) { | |
6f72c7e2 | 1867 | ret = -EINVAL; |
c47ca32d | 1868 | goto free_args; |
6f72c7e2 AJ |
1869 | } |
1870 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1871 | if (IS_ERR(inherit)) { | |
1872 | ret = PTR_ERR(inherit); | |
c47ca32d | 1873 | goto free_args; |
6f72c7e2 | 1874 | } |
5011c5a6 DC |
1875 | |
1876 | if (inherit->num_qgroups > PAGE_SIZE || | |
1877 | inherit->num_ref_copies > PAGE_SIZE || | |
1878 | inherit->num_excl_copies > PAGE_SIZE) { | |
1879 | ret = -EINVAL; | |
1880 | goto free_inherit; | |
1881 | } | |
1882 | ||
1883 | nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + | |
1884 | 2 * inherit->num_excl_copies; | |
1885 | if (vol_args->size != struct_size(inherit, qgroups, nums)) { | |
1886 | ret = -EINVAL; | |
1887 | goto free_inherit; | |
1888 | } | |
6f72c7e2 | 1889 | } |
fa0d2b9b | 1890 | |
4d4340c9 CB |
1891 | ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file), |
1892 | vol_args->name, vol_args->fd, subvol, | |
1893 | readonly, inherit); | |
c47ca32d DC |
1894 | if (ret) |
1895 | goto free_inherit; | |
c47ca32d | 1896 | free_inherit: |
6f72c7e2 | 1897 | kfree(inherit); |
c47ca32d DC |
1898 | free_args: |
1899 | kfree(vol_args); | |
f46b5a66 CH |
1900 | return ret; |
1901 | } | |
1902 | ||
0caa102d LZ |
1903 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1904 | void __user *arg) | |
1905 | { | |
496ad9aa | 1906 | struct inode *inode = file_inode(file); |
0b246afa | 1907 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0caa102d LZ |
1908 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1909 | int ret = 0; | |
1910 | u64 flags = 0; | |
1911 | ||
4a0cc7ca | 1912 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1913 | return -EINVAL; |
1914 | ||
0b246afa | 1915 | down_read(&fs_info->subvol_sem); |
0caa102d LZ |
1916 | if (btrfs_root_readonly(root)) |
1917 | flags |= BTRFS_SUBVOL_RDONLY; | |
0b246afa | 1918 | up_read(&fs_info->subvol_sem); |
0caa102d LZ |
1919 | |
1920 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1921 | ret = -EFAULT; | |
1922 | ||
1923 | return ret; | |
1924 | } | |
1925 | ||
1926 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1927 | void __user *arg) | |
1928 | { | |
496ad9aa | 1929 | struct inode *inode = file_inode(file); |
0b246afa | 1930 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
0caa102d LZ |
1931 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1932 | struct btrfs_trans_handle *trans; | |
1933 | u64 root_flags; | |
1934 | u64 flags; | |
1935 | int ret = 0; | |
1936 | ||
39e1674f | 1937 | if (!inode_owner_or_capable(file_mnt_user_ns(file), inode)) |
bd60ea0f DS |
1938 | return -EPERM; |
1939 | ||
b9ca0664 LB |
1940 | ret = mnt_want_write_file(file); |
1941 | if (ret) | |
1942 | goto out; | |
0caa102d | 1943 | |
4a0cc7ca | 1944 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
b9ca0664 LB |
1945 | ret = -EINVAL; |
1946 | goto out_drop_write; | |
1947 | } | |
0caa102d | 1948 | |
b9ca0664 LB |
1949 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1950 | ret = -EFAULT; | |
1951 | goto out_drop_write; | |
1952 | } | |
0caa102d | 1953 | |
b9ca0664 LB |
1954 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1955 | ret = -EOPNOTSUPP; | |
1956 | goto out_drop_write; | |
1957 | } | |
0caa102d | 1958 | |
0b246afa | 1959 | down_write(&fs_info->subvol_sem); |
0caa102d LZ |
1960 | |
1961 | /* nothing to do */ | |
1962 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1963 | goto out_drop_sem; |
0caa102d LZ |
1964 | |
1965 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1966 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1967 | btrfs_set_root_flags(&root->root_item, |
1968 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1969 | } else { |
1970 | /* | |
1971 | * Block RO -> RW transition if this subvolume is involved in | |
1972 | * send | |
1973 | */ | |
1974 | spin_lock(&root->root_item_lock); | |
1975 | if (root->send_in_progress == 0) { | |
1976 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1977 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1978 | spin_unlock(&root->root_item_lock); |
1979 | } else { | |
1980 | spin_unlock(&root->root_item_lock); | |
0b246afa JM |
1981 | btrfs_warn(fs_info, |
1982 | "Attempt to set subvolume %llu read-write during send", | |
1983 | root->root_key.objectid); | |
2c686537 DS |
1984 | ret = -EPERM; |
1985 | goto out_drop_sem; | |
1986 | } | |
1987 | } | |
0caa102d LZ |
1988 | |
1989 | trans = btrfs_start_transaction(root, 1); | |
1990 | if (IS_ERR(trans)) { | |
1991 | ret = PTR_ERR(trans); | |
1992 | goto out_reset; | |
1993 | } | |
1994 | ||
0b246afa | 1995 | ret = btrfs_update_root(trans, fs_info->tree_root, |
0caa102d | 1996 | &root->root_key, &root->root_item); |
9417ebc8 NB |
1997 | if (ret < 0) { |
1998 | btrfs_end_transaction(trans); | |
1999 | goto out_reset; | |
2000 | } | |
2001 | ||
2002 | ret = btrfs_commit_transaction(trans); | |
0caa102d | 2003 | |
0caa102d LZ |
2004 | out_reset: |
2005 | if (ret) | |
2006 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 2007 | out_drop_sem: |
0b246afa | 2008 | up_write(&fs_info->subvol_sem); |
b9ca0664 LB |
2009 | out_drop_write: |
2010 | mnt_drop_write_file(file); | |
2011 | out: | |
0caa102d LZ |
2012 | return ret; |
2013 | } | |
2014 | ||
ac8e9819 CM |
2015 | static noinline int key_in_sk(struct btrfs_key *key, |
2016 | struct btrfs_ioctl_search_key *sk) | |
2017 | { | |
abc6e134 CM |
2018 | struct btrfs_key test; |
2019 | int ret; | |
2020 | ||
2021 | test.objectid = sk->min_objectid; | |
2022 | test.type = sk->min_type; | |
2023 | test.offset = sk->min_offset; | |
2024 | ||
2025 | ret = btrfs_comp_cpu_keys(key, &test); | |
2026 | if (ret < 0) | |
ac8e9819 | 2027 | return 0; |
abc6e134 CM |
2028 | |
2029 | test.objectid = sk->max_objectid; | |
2030 | test.type = sk->max_type; | |
2031 | test.offset = sk->max_offset; | |
2032 | ||
2033 | ret = btrfs_comp_cpu_keys(key, &test); | |
2034 | if (ret > 0) | |
ac8e9819 CM |
2035 | return 0; |
2036 | return 1; | |
2037 | } | |
2038 | ||
df397565 | 2039 | static noinline int copy_to_sk(struct btrfs_path *path, |
ac8e9819 CM |
2040 | struct btrfs_key *key, |
2041 | struct btrfs_ioctl_search_key *sk, | |
9b6e817d | 2042 | size_t *buf_size, |
ba346b35 | 2043 | char __user *ubuf, |
ac8e9819 CM |
2044 | unsigned long *sk_offset, |
2045 | int *num_found) | |
2046 | { | |
2047 | u64 found_transid; | |
2048 | struct extent_buffer *leaf; | |
2049 | struct btrfs_ioctl_search_header sh; | |
dd81d459 | 2050 | struct btrfs_key test; |
ac8e9819 CM |
2051 | unsigned long item_off; |
2052 | unsigned long item_len; | |
2053 | int nritems; | |
2054 | int i; | |
2055 | int slot; | |
ac8e9819 CM |
2056 | int ret = 0; |
2057 | ||
2058 | leaf = path->nodes[0]; | |
2059 | slot = path->slots[0]; | |
2060 | nritems = btrfs_header_nritems(leaf); | |
2061 | ||
2062 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
2063 | i = nritems; | |
2064 | goto advance_key; | |
2065 | } | |
2066 | found_transid = btrfs_header_generation(leaf); | |
2067 | ||
2068 | for (i = slot; i < nritems; i++) { | |
2069 | item_off = btrfs_item_ptr_offset(leaf, i); | |
2070 | item_len = btrfs_item_size_nr(leaf, i); | |
2071 | ||
03b71c6c GP |
2072 | btrfs_item_key_to_cpu(leaf, key, i); |
2073 | if (!key_in_sk(key, sk)) | |
2074 | continue; | |
2075 | ||
9b6e817d | 2076 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
2077 | if (*num_found) { |
2078 | ret = 1; | |
2079 | goto out; | |
2080 | } | |
2081 | ||
2082 | /* | |
2083 | * return one empty item back for v1, which does not | |
2084 | * handle -EOVERFLOW | |
2085 | */ | |
2086 | ||
9b6e817d | 2087 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 2088 | item_len = 0; |
8f5f6178 GH |
2089 | ret = -EOVERFLOW; |
2090 | } | |
ac8e9819 | 2091 | |
9b6e817d | 2092 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 2093 | ret = 1; |
25c9bc2e | 2094 | goto out; |
ac8e9819 CM |
2095 | } |
2096 | ||
ac8e9819 CM |
2097 | sh.objectid = key->objectid; |
2098 | sh.offset = key->offset; | |
2099 | sh.type = key->type; | |
2100 | sh.len = item_len; | |
2101 | sh.transid = found_transid; | |
2102 | ||
a48b73ec JB |
2103 | /* |
2104 | * Copy search result header. If we fault then loop again so we | |
2105 | * can fault in the pages and -EFAULT there if there's a | |
2106 | * problem. Otherwise we'll fault and then copy the buffer in | |
2107 | * properly this next time through | |
2108 | */ | |
2109 | if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) { | |
2110 | ret = 0; | |
ba346b35 GH |
2111 | goto out; |
2112 | } | |
2113 | ||
ac8e9819 CM |
2114 | *sk_offset += sizeof(sh); |
2115 | ||
2116 | if (item_len) { | |
ba346b35 | 2117 | char __user *up = ubuf + *sk_offset; |
a48b73ec JB |
2118 | /* |
2119 | * Copy the item, same behavior as above, but reset the | |
2120 | * * sk_offset so we copy the full thing again. | |
2121 | */ | |
2122 | if (read_extent_buffer_to_user_nofault(leaf, up, | |
2123 | item_off, item_len)) { | |
2124 | ret = 0; | |
2125 | *sk_offset -= sizeof(sh); | |
ba346b35 GH |
2126 | goto out; |
2127 | } | |
2128 | ||
ac8e9819 | 2129 | *sk_offset += item_len; |
ac8e9819 | 2130 | } |
e2156867 | 2131 | (*num_found)++; |
ac8e9819 | 2132 | |
8f5f6178 GH |
2133 | if (ret) /* -EOVERFLOW from above */ |
2134 | goto out; | |
2135 | ||
25c9bc2e GH |
2136 | if (*num_found >= sk->nr_items) { |
2137 | ret = 1; | |
2138 | goto out; | |
2139 | } | |
ac8e9819 CM |
2140 | } |
2141 | advance_key: | |
abc6e134 | 2142 | ret = 0; |
dd81d459 NA |
2143 | test.objectid = sk->max_objectid; |
2144 | test.type = sk->max_type; | |
2145 | test.offset = sk->max_offset; | |
2146 | if (btrfs_comp_cpu_keys(key, &test) >= 0) | |
2147 | ret = 1; | |
2148 | else if (key->offset < (u64)-1) | |
ac8e9819 | 2149 | key->offset++; |
dd81d459 | 2150 | else if (key->type < (u8)-1) { |
abc6e134 | 2151 | key->offset = 0; |
ac8e9819 | 2152 | key->type++; |
dd81d459 | 2153 | } else if (key->objectid < (u64)-1) { |
abc6e134 CM |
2154 | key->offset = 0; |
2155 | key->type = 0; | |
ac8e9819 | 2156 | key->objectid++; |
abc6e134 CM |
2157 | } else |
2158 | ret = 1; | |
25c9bc2e | 2159 | out: |
ba346b35 GH |
2160 | /* |
2161 | * 0: all items from this leaf copied, continue with next | |
2162 | * 1: * more items can be copied, but unused buffer is too small | |
2163 | * * all items were found | |
2164 | * Either way, it will stops the loop which iterates to the next | |
2165 | * leaf | |
2166 | * -EOVERFLOW: item was to large for buffer | |
2167 | * -EFAULT: could not copy extent buffer back to userspace | |
2168 | */ | |
ac8e9819 CM |
2169 | return ret; |
2170 | } | |
2171 | ||
2172 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 2173 | struct btrfs_ioctl_search_key *sk, |
9b6e817d | 2174 | size_t *buf_size, |
ba346b35 | 2175 | char __user *ubuf) |
ac8e9819 | 2176 | { |
0b246afa | 2177 | struct btrfs_fs_info *info = btrfs_sb(inode->i_sb); |
ac8e9819 CM |
2178 | struct btrfs_root *root; |
2179 | struct btrfs_key key; | |
ac8e9819 | 2180 | struct btrfs_path *path; |
ac8e9819 CM |
2181 | int ret; |
2182 | int num_found = 0; | |
2183 | unsigned long sk_offset = 0; | |
2184 | ||
9b6e817d GH |
2185 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
2186 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 2187 | return -EOVERFLOW; |
9b6e817d | 2188 | } |
12544442 | 2189 | |
ac8e9819 CM |
2190 | path = btrfs_alloc_path(); |
2191 | if (!path) | |
2192 | return -ENOMEM; | |
2193 | ||
2194 | if (sk->tree_id == 0) { | |
2195 | /* search the root of the inode that was passed */ | |
00246528 | 2196 | root = btrfs_grab_root(BTRFS_I(inode)->root); |
ac8e9819 | 2197 | } else { |
56e9357a | 2198 | root = btrfs_get_fs_root(info, sk->tree_id, true); |
ac8e9819 | 2199 | if (IS_ERR(root)) { |
ac8e9819 | 2200 | btrfs_free_path(path); |
ad1e3d56 | 2201 | return PTR_ERR(root); |
ac8e9819 CM |
2202 | } |
2203 | } | |
2204 | ||
2205 | key.objectid = sk->min_objectid; | |
2206 | key.type = sk->min_type; | |
2207 | key.offset = sk->min_offset; | |
2208 | ||
67871254 | 2209 | while (1) { |
1c78544e FM |
2210 | ret = fault_in_pages_writeable(ubuf + sk_offset, |
2211 | *buf_size - sk_offset); | |
a48b73ec JB |
2212 | if (ret) |
2213 | break; | |
2214 | ||
6174d3cb | 2215 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
2216 | if (ret != 0) { |
2217 | if (ret > 0) | |
2218 | ret = 0; | |
2219 | goto err; | |
2220 | } | |
df397565 | 2221 | ret = copy_to_sk(path, &key, sk, buf_size, ubuf, |
ac8e9819 | 2222 | &sk_offset, &num_found); |
b3b4aa74 | 2223 | btrfs_release_path(path); |
25c9bc2e | 2224 | if (ret) |
ac8e9819 CM |
2225 | break; |
2226 | ||
2227 | } | |
8f5f6178 GH |
2228 | if (ret > 0) |
2229 | ret = 0; | |
ac8e9819 CM |
2230 | err: |
2231 | sk->nr_items = num_found; | |
00246528 | 2232 | btrfs_put_root(root); |
ac8e9819 CM |
2233 | btrfs_free_path(path); |
2234 | return ret; | |
2235 | } | |
2236 | ||
2237 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
2238 | void __user *argp) | |
2239 | { | |
ba346b35 GH |
2240 | struct btrfs_ioctl_search_args __user *uargs; |
2241 | struct btrfs_ioctl_search_key sk; | |
9b6e817d GH |
2242 | struct inode *inode; |
2243 | int ret; | |
2244 | size_t buf_size; | |
ac8e9819 CM |
2245 | |
2246 | if (!capable(CAP_SYS_ADMIN)) | |
2247 | return -EPERM; | |
2248 | ||
ba346b35 GH |
2249 | uargs = (struct btrfs_ioctl_search_args __user *)argp; |
2250 | ||
2251 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) | |
2252 | return -EFAULT; | |
ac8e9819 | 2253 | |
ba346b35 | 2254 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 2255 | |
496ad9aa | 2256 | inode = file_inode(file); |
ba346b35 | 2257 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
2258 | |
2259 | /* | |
2260 | * In the origin implementation an overflow is handled by returning a | |
2261 | * search header with a len of zero, so reset ret. | |
2262 | */ | |
2263 | if (ret == -EOVERFLOW) | |
2264 | ret = 0; | |
2265 | ||
ba346b35 | 2266 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 2267 | ret = -EFAULT; |
ac8e9819 CM |
2268 | return ret; |
2269 | } | |
2270 | ||
cc68a8a5 GH |
2271 | static noinline int btrfs_ioctl_tree_search_v2(struct file *file, |
2272 | void __user *argp) | |
2273 | { | |
2274 | struct btrfs_ioctl_search_args_v2 __user *uarg; | |
2275 | struct btrfs_ioctl_search_args_v2 args; | |
2276 | struct inode *inode; | |
2277 | int ret; | |
2278 | size_t buf_size; | |
ee22184b | 2279 | const size_t buf_limit = SZ_16M; |
cc68a8a5 GH |
2280 | |
2281 | if (!capable(CAP_SYS_ADMIN)) | |
2282 | return -EPERM; | |
2283 | ||
2284 | /* copy search header and buffer size */ | |
2285 | uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; | |
2286 | if (copy_from_user(&args, uarg, sizeof(args))) | |
2287 | return -EFAULT; | |
2288 | ||
2289 | buf_size = args.buf_size; | |
2290 | ||
cc68a8a5 GH |
2291 | /* limit result size to 16MB */ |
2292 | if (buf_size > buf_limit) | |
2293 | buf_size = buf_limit; | |
2294 | ||
2295 | inode = file_inode(file); | |
2296 | ret = search_ioctl(inode, &args.key, &buf_size, | |
718dc5fa | 2297 | (char __user *)(&uarg->buf[0])); |
cc68a8a5 GH |
2298 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) |
2299 | ret = -EFAULT; | |
2300 | else if (ret == -EOVERFLOW && | |
2301 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
2302 | ret = -EFAULT; | |
2303 | ||
ac8e9819 CM |
2304 | return ret; |
2305 | } | |
2306 | ||
98d377a0 | 2307 | /* |
ac8e9819 CM |
2308 | * Search INODE_REFs to identify path name of 'dirid' directory |
2309 | * in a 'tree_id' tree. and sets path name to 'name'. | |
2310 | */ | |
98d377a0 TH |
2311 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
2312 | u64 tree_id, u64 dirid, char *name) | |
2313 | { | |
2314 | struct btrfs_root *root; | |
2315 | struct btrfs_key key; | |
ac8e9819 | 2316 | char *ptr; |
98d377a0 TH |
2317 | int ret = -1; |
2318 | int slot; | |
2319 | int len; | |
2320 | int total_len = 0; | |
2321 | struct btrfs_inode_ref *iref; | |
2322 | struct extent_buffer *l; | |
2323 | struct btrfs_path *path; | |
2324 | ||
2325 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
2326 | name[0]='\0'; | |
2327 | return 0; | |
2328 | } | |
2329 | ||
2330 | path = btrfs_alloc_path(); | |
2331 | if (!path) | |
2332 | return -ENOMEM; | |
2333 | ||
c8bcbfbd | 2334 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1]; |
98d377a0 | 2335 | |
56e9357a | 2336 | root = btrfs_get_fs_root(info, tree_id, true); |
98d377a0 | 2337 | if (IS_ERR(root)) { |
ad1e3d56 | 2338 | ret = PTR_ERR(root); |
88234012 JB |
2339 | root = NULL; |
2340 | goto out; | |
2341 | } | |
98d377a0 TH |
2342 | |
2343 | key.objectid = dirid; | |
2344 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2345 | key.offset = (u64)-1; |
98d377a0 | 2346 | |
67871254 | 2347 | while (1) { |
0ff40a91 | 2348 | ret = btrfs_search_backwards(root, &key, path); |
98d377a0 TH |
2349 | if (ret < 0) |
2350 | goto out; | |
18674c6c | 2351 | else if (ret > 0) { |
0ff40a91 MPS |
2352 | ret = -ENOENT; |
2353 | goto out; | |
18674c6c | 2354 | } |
98d377a0 TH |
2355 | |
2356 | l = path->nodes[0]; | |
2357 | slot = path->slots[0]; | |
98d377a0 | 2358 | |
98d377a0 TH |
2359 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2360 | len = btrfs_inode_ref_name_len(l, iref); | |
2361 | ptr -= len + 1; | |
2362 | total_len += len + 1; | |
a696cf35 FDBM |
2363 | if (ptr < name) { |
2364 | ret = -ENAMETOOLONG; | |
98d377a0 | 2365 | goto out; |
a696cf35 | 2366 | } |
98d377a0 TH |
2367 | |
2368 | *(ptr + len) = '/'; | |
67871254 | 2369 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2370 | |
2371 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2372 | break; | |
2373 | ||
b3b4aa74 | 2374 | btrfs_release_path(path); |
98d377a0 | 2375 | key.objectid = key.offset; |
8ad6fcab | 2376 | key.offset = (u64)-1; |
98d377a0 | 2377 | dirid = key.objectid; |
98d377a0 | 2378 | } |
77906a50 | 2379 | memmove(name, ptr, total_len); |
67871254 | 2380 | name[total_len] = '\0'; |
98d377a0 TH |
2381 | ret = 0; |
2382 | out: | |
00246528 | 2383 | btrfs_put_root(root); |
98d377a0 | 2384 | btrfs_free_path(path); |
ac8e9819 CM |
2385 | return ret; |
2386 | } | |
2387 | ||
6623d9a0 CB |
2388 | static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns, |
2389 | struct inode *inode, | |
23d0b79d TM |
2390 | struct btrfs_ioctl_ino_lookup_user_args *args) |
2391 | { | |
2392 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2393 | struct super_block *sb = inode->i_sb; | |
2394 | struct btrfs_key upper_limit = BTRFS_I(inode)->location; | |
2395 | u64 treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2396 | u64 dirid = args->dirid; | |
2397 | unsigned long item_off; | |
2398 | unsigned long item_len; | |
2399 | struct btrfs_inode_ref *iref; | |
2400 | struct btrfs_root_ref *rref; | |
b8a49ae1 | 2401 | struct btrfs_root *root = NULL; |
23d0b79d TM |
2402 | struct btrfs_path *path; |
2403 | struct btrfs_key key, key2; | |
2404 | struct extent_buffer *leaf; | |
2405 | struct inode *temp_inode; | |
2406 | char *ptr; | |
2407 | int slot; | |
2408 | int len; | |
2409 | int total_len = 0; | |
2410 | int ret; | |
2411 | ||
2412 | path = btrfs_alloc_path(); | |
2413 | if (!path) | |
2414 | return -ENOMEM; | |
2415 | ||
2416 | /* | |
2417 | * If the bottom subvolume does not exist directly under upper_limit, | |
2418 | * construct the path in from the bottom up. | |
2419 | */ | |
2420 | if (dirid != upper_limit.objectid) { | |
2421 | ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1]; | |
2422 | ||
56e9357a | 2423 | root = btrfs_get_fs_root(fs_info, treeid, true); |
23d0b79d TM |
2424 | if (IS_ERR(root)) { |
2425 | ret = PTR_ERR(root); | |
2426 | goto out; | |
2427 | } | |
2428 | ||
2429 | key.objectid = dirid; | |
2430 | key.type = BTRFS_INODE_REF_KEY; | |
2431 | key.offset = (u64)-1; | |
2432 | while (1) { | |
0ff40a91 MPS |
2433 | ret = btrfs_search_backwards(root, &key, path); |
2434 | if (ret < 0) | |
2435 | goto out_put; | |
2436 | else if (ret > 0) { | |
2437 | ret = -ENOENT; | |
b8a49ae1 | 2438 | goto out_put; |
23d0b79d TM |
2439 | } |
2440 | ||
2441 | leaf = path->nodes[0]; | |
2442 | slot = path->slots[0]; | |
23d0b79d TM |
2443 | |
2444 | iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref); | |
2445 | len = btrfs_inode_ref_name_len(leaf, iref); | |
2446 | ptr -= len + 1; | |
2447 | total_len += len + 1; | |
2448 | if (ptr < args->path) { | |
2449 | ret = -ENAMETOOLONG; | |
b8a49ae1 | 2450 | goto out_put; |
23d0b79d TM |
2451 | } |
2452 | ||
2453 | *(ptr + len) = '/'; | |
2454 | read_extent_buffer(leaf, ptr, | |
2455 | (unsigned long)(iref + 1), len); | |
2456 | ||
2457 | /* Check the read+exec permission of this directory */ | |
2458 | ret = btrfs_previous_item(root, path, dirid, | |
2459 | BTRFS_INODE_ITEM_KEY); | |
2460 | if (ret < 0) { | |
b8a49ae1 | 2461 | goto out_put; |
23d0b79d TM |
2462 | } else if (ret > 0) { |
2463 | ret = -ENOENT; | |
b8a49ae1 | 2464 | goto out_put; |
23d0b79d TM |
2465 | } |
2466 | ||
2467 | leaf = path->nodes[0]; | |
2468 | slot = path->slots[0]; | |
2469 | btrfs_item_key_to_cpu(leaf, &key2, slot); | |
2470 | if (key2.objectid != dirid) { | |
2471 | ret = -ENOENT; | |
b8a49ae1 | 2472 | goto out_put; |
23d0b79d TM |
2473 | } |
2474 | ||
0202e83f | 2475 | temp_inode = btrfs_iget(sb, key2.objectid, root); |
3ca57bd6 MT |
2476 | if (IS_ERR(temp_inode)) { |
2477 | ret = PTR_ERR(temp_inode); | |
b8a49ae1 | 2478 | goto out_put; |
3ca57bd6 | 2479 | } |
6623d9a0 | 2480 | ret = inode_permission(mnt_userns, temp_inode, |
47291baa | 2481 | MAY_READ | MAY_EXEC); |
23d0b79d TM |
2482 | iput(temp_inode); |
2483 | if (ret) { | |
2484 | ret = -EACCES; | |
b8a49ae1 | 2485 | goto out_put; |
23d0b79d TM |
2486 | } |
2487 | ||
2488 | if (key.offset == upper_limit.objectid) | |
2489 | break; | |
2490 | if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) { | |
2491 | ret = -EACCES; | |
b8a49ae1 | 2492 | goto out_put; |
23d0b79d TM |
2493 | } |
2494 | ||
2495 | btrfs_release_path(path); | |
2496 | key.objectid = key.offset; | |
2497 | key.offset = (u64)-1; | |
2498 | dirid = key.objectid; | |
2499 | } | |
2500 | ||
2501 | memmove(args->path, ptr, total_len); | |
2502 | args->path[total_len] = '\0'; | |
00246528 | 2503 | btrfs_put_root(root); |
b8a49ae1 | 2504 | root = NULL; |
23d0b79d TM |
2505 | btrfs_release_path(path); |
2506 | } | |
2507 | ||
2508 | /* Get the bottom subvolume's name from ROOT_REF */ | |
23d0b79d TM |
2509 | key.objectid = treeid; |
2510 | key.type = BTRFS_ROOT_REF_KEY; | |
2511 | key.offset = args->treeid; | |
b8a49ae1 | 2512 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
23d0b79d TM |
2513 | if (ret < 0) { |
2514 | goto out; | |
2515 | } else if (ret > 0) { | |
2516 | ret = -ENOENT; | |
2517 | goto out; | |
2518 | } | |
2519 | ||
2520 | leaf = path->nodes[0]; | |
2521 | slot = path->slots[0]; | |
2522 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2523 | ||
2524 | item_off = btrfs_item_ptr_offset(leaf, slot); | |
2525 | item_len = btrfs_item_size_nr(leaf, slot); | |
2526 | /* Check if dirid in ROOT_REF corresponds to passed dirid */ | |
2527 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2528 | if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) { | |
2529 | ret = -EINVAL; | |
2530 | goto out; | |
2531 | } | |
2532 | ||
2533 | /* Copy subvolume's name */ | |
2534 | item_off += sizeof(struct btrfs_root_ref); | |
2535 | item_len -= sizeof(struct btrfs_root_ref); | |
2536 | read_extent_buffer(leaf, args->name, item_off, item_len); | |
2537 | args->name[item_len] = 0; | |
2538 | ||
b8a49ae1 | 2539 | out_put: |
00246528 | 2540 | btrfs_put_root(root); |
23d0b79d TM |
2541 | out: |
2542 | btrfs_free_path(path); | |
2543 | return ret; | |
2544 | } | |
2545 | ||
ac8e9819 CM |
2546 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, |
2547 | void __user *argp) | |
2548 | { | |
bece2e82 BVA |
2549 | struct btrfs_ioctl_ino_lookup_args *args; |
2550 | struct inode *inode; | |
01b810b8 | 2551 | int ret = 0; |
ac8e9819 | 2552 | |
2354d08f JL |
2553 | args = memdup_user(argp, sizeof(*args)); |
2554 | if (IS_ERR(args)) | |
2555 | return PTR_ERR(args); | |
c2b96929 | 2556 | |
496ad9aa | 2557 | inode = file_inode(file); |
ac8e9819 | 2558 | |
01b810b8 DS |
2559 | /* |
2560 | * Unprivileged query to obtain the containing subvolume root id. The | |
2561 | * path is reset so it's consistent with btrfs_search_path_in_tree. | |
2562 | */ | |
1b53ac4d CM |
2563 | if (args->treeid == 0) |
2564 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2565 | ||
01b810b8 DS |
2566 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
2567 | args->name[0] = 0; | |
2568 | goto out; | |
2569 | } | |
2570 | ||
2571 | if (!capable(CAP_SYS_ADMIN)) { | |
2572 | ret = -EPERM; | |
2573 | goto out; | |
2574 | } | |
2575 | ||
ac8e9819 CM |
2576 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2577 | args->treeid, args->objectid, | |
2578 | args->name); | |
2579 | ||
01b810b8 | 2580 | out: |
ac8e9819 CM |
2581 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
2582 | ret = -EFAULT; | |
2583 | ||
2584 | kfree(args); | |
98d377a0 TH |
2585 | return ret; |
2586 | } | |
2587 | ||
23d0b79d TM |
2588 | /* |
2589 | * Version of ino_lookup ioctl (unprivileged) | |
2590 | * | |
2591 | * The main differences from ino_lookup ioctl are: | |
2592 | * | |
2593 | * 1. Read + Exec permission will be checked using inode_permission() during | |
2594 | * path construction. -EACCES will be returned in case of failure. | |
2595 | * 2. Path construction will be stopped at the inode number which corresponds | |
2596 | * to the fd with which this ioctl is called. If constructed path does not | |
2597 | * exist under fd's inode, -EACCES will be returned. | |
2598 | * 3. The name of bottom subvolume is also searched and filled. | |
2599 | */ | |
2600 | static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp) | |
2601 | { | |
2602 | struct btrfs_ioctl_ino_lookup_user_args *args; | |
2603 | struct inode *inode; | |
2604 | int ret; | |
2605 | ||
2606 | args = memdup_user(argp, sizeof(*args)); | |
2607 | if (IS_ERR(args)) | |
2608 | return PTR_ERR(args); | |
2609 | ||
2610 | inode = file_inode(file); | |
2611 | ||
2612 | if (args->dirid == BTRFS_FIRST_FREE_OBJECTID && | |
2613 | BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) { | |
2614 | /* | |
2615 | * The subvolume does not exist under fd with which this is | |
2616 | * called | |
2617 | */ | |
2618 | kfree(args); | |
2619 | return -EACCES; | |
2620 | } | |
2621 | ||
6623d9a0 | 2622 | ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args); |
23d0b79d TM |
2623 | |
2624 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2625 | ret = -EFAULT; | |
2626 | ||
2627 | kfree(args); | |
2628 | return ret; | |
2629 | } | |
2630 | ||
b64ec075 TM |
2631 | /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */ |
2632 | static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp) | |
2633 | { | |
2634 | struct btrfs_ioctl_get_subvol_info_args *subvol_info; | |
2635 | struct btrfs_fs_info *fs_info; | |
2636 | struct btrfs_root *root; | |
2637 | struct btrfs_path *path; | |
2638 | struct btrfs_key key; | |
2639 | struct btrfs_root_item *root_item; | |
2640 | struct btrfs_root_ref *rref; | |
2641 | struct extent_buffer *leaf; | |
2642 | unsigned long item_off; | |
2643 | unsigned long item_len; | |
2644 | struct inode *inode; | |
2645 | int slot; | |
2646 | int ret = 0; | |
2647 | ||
2648 | path = btrfs_alloc_path(); | |
2649 | if (!path) | |
2650 | return -ENOMEM; | |
2651 | ||
2652 | subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL); | |
2653 | if (!subvol_info) { | |
2654 | btrfs_free_path(path); | |
2655 | return -ENOMEM; | |
2656 | } | |
2657 | ||
2658 | inode = file_inode(file); | |
2659 | fs_info = BTRFS_I(inode)->root->fs_info; | |
2660 | ||
2661 | /* Get root_item of inode's subvolume */ | |
2662 | key.objectid = BTRFS_I(inode)->root->root_key.objectid; | |
56e9357a | 2663 | root = btrfs_get_fs_root(fs_info, key.objectid, true); |
b64ec075 TM |
2664 | if (IS_ERR(root)) { |
2665 | ret = PTR_ERR(root); | |
04734e84 JB |
2666 | goto out_free; |
2667 | } | |
b64ec075 TM |
2668 | root_item = &root->root_item; |
2669 | ||
2670 | subvol_info->treeid = key.objectid; | |
2671 | ||
2672 | subvol_info->generation = btrfs_root_generation(root_item); | |
2673 | subvol_info->flags = btrfs_root_flags(root_item); | |
2674 | ||
2675 | memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE); | |
2676 | memcpy(subvol_info->parent_uuid, root_item->parent_uuid, | |
2677 | BTRFS_UUID_SIZE); | |
2678 | memcpy(subvol_info->received_uuid, root_item->received_uuid, | |
2679 | BTRFS_UUID_SIZE); | |
2680 | ||
2681 | subvol_info->ctransid = btrfs_root_ctransid(root_item); | |
2682 | subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime); | |
2683 | subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime); | |
2684 | ||
2685 | subvol_info->otransid = btrfs_root_otransid(root_item); | |
2686 | subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime); | |
2687 | subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime); | |
2688 | ||
2689 | subvol_info->stransid = btrfs_root_stransid(root_item); | |
2690 | subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime); | |
2691 | subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime); | |
2692 | ||
2693 | subvol_info->rtransid = btrfs_root_rtransid(root_item); | |
2694 | subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime); | |
2695 | subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime); | |
2696 | ||
2697 | if (key.objectid != BTRFS_FS_TREE_OBJECTID) { | |
2698 | /* Search root tree for ROOT_BACKREF of this subvolume */ | |
b64ec075 TM |
2699 | key.type = BTRFS_ROOT_BACKREF_KEY; |
2700 | key.offset = 0; | |
04734e84 | 2701 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); |
b64ec075 TM |
2702 | if (ret < 0) { |
2703 | goto out; | |
2704 | } else if (path->slots[0] >= | |
2705 | btrfs_header_nritems(path->nodes[0])) { | |
04734e84 | 2706 | ret = btrfs_next_leaf(fs_info->tree_root, path); |
b64ec075 TM |
2707 | if (ret < 0) { |
2708 | goto out; | |
2709 | } else if (ret > 0) { | |
2710 | ret = -EUCLEAN; | |
2711 | goto out; | |
2712 | } | |
2713 | } | |
2714 | ||
2715 | leaf = path->nodes[0]; | |
2716 | slot = path->slots[0]; | |
2717 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2718 | if (key.objectid == subvol_info->treeid && | |
2719 | key.type == BTRFS_ROOT_BACKREF_KEY) { | |
2720 | subvol_info->parent_id = key.offset; | |
2721 | ||
2722 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2723 | subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref); | |
2724 | ||
2725 | item_off = btrfs_item_ptr_offset(leaf, slot) | |
2726 | + sizeof(struct btrfs_root_ref); | |
2727 | item_len = btrfs_item_size_nr(leaf, slot) | |
2728 | - sizeof(struct btrfs_root_ref); | |
2729 | read_extent_buffer(leaf, subvol_info->name, | |
2730 | item_off, item_len); | |
2731 | } else { | |
2732 | ret = -ENOENT; | |
2733 | goto out; | |
2734 | } | |
2735 | } | |
2736 | ||
2737 | if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) | |
2738 | ret = -EFAULT; | |
2739 | ||
2740 | out: | |
00246528 | 2741 | btrfs_put_root(root); |
04734e84 | 2742 | out_free: |
b64ec075 | 2743 | btrfs_free_path(path); |
b091f7fe | 2744 | kfree(subvol_info); |
b64ec075 TM |
2745 | return ret; |
2746 | } | |
2747 | ||
42e4b520 TM |
2748 | /* |
2749 | * Return ROOT_REF information of the subvolume containing this inode | |
2750 | * except the subvolume name. | |
2751 | */ | |
2752 | static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp) | |
2753 | { | |
2754 | struct btrfs_ioctl_get_subvol_rootref_args *rootrefs; | |
2755 | struct btrfs_root_ref *rref; | |
2756 | struct btrfs_root *root; | |
2757 | struct btrfs_path *path; | |
2758 | struct btrfs_key key; | |
2759 | struct extent_buffer *leaf; | |
2760 | struct inode *inode; | |
2761 | u64 objectid; | |
2762 | int slot; | |
2763 | int ret; | |
2764 | u8 found; | |
2765 | ||
2766 | path = btrfs_alloc_path(); | |
2767 | if (!path) | |
2768 | return -ENOMEM; | |
2769 | ||
2770 | rootrefs = memdup_user(argp, sizeof(*rootrefs)); | |
2771 | if (IS_ERR(rootrefs)) { | |
2772 | btrfs_free_path(path); | |
2773 | return PTR_ERR(rootrefs); | |
2774 | } | |
2775 | ||
2776 | inode = file_inode(file); | |
2777 | root = BTRFS_I(inode)->root->fs_info->tree_root; | |
2778 | objectid = BTRFS_I(inode)->root->root_key.objectid; | |
2779 | ||
2780 | key.objectid = objectid; | |
2781 | key.type = BTRFS_ROOT_REF_KEY; | |
2782 | key.offset = rootrefs->min_treeid; | |
2783 | found = 0; | |
2784 | ||
2785 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2786 | if (ret < 0) { | |
2787 | goto out; | |
2788 | } else if (path->slots[0] >= | |
2789 | btrfs_header_nritems(path->nodes[0])) { | |
2790 | ret = btrfs_next_leaf(root, path); | |
2791 | if (ret < 0) { | |
2792 | goto out; | |
2793 | } else if (ret > 0) { | |
2794 | ret = -EUCLEAN; | |
2795 | goto out; | |
2796 | } | |
2797 | } | |
2798 | while (1) { | |
2799 | leaf = path->nodes[0]; | |
2800 | slot = path->slots[0]; | |
2801 | ||
2802 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2803 | if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) { | |
2804 | ret = 0; | |
2805 | goto out; | |
2806 | } | |
2807 | ||
2808 | if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) { | |
2809 | ret = -EOVERFLOW; | |
2810 | goto out; | |
2811 | } | |
2812 | ||
2813 | rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref); | |
2814 | rootrefs->rootref[found].treeid = key.offset; | |
2815 | rootrefs->rootref[found].dirid = | |
2816 | btrfs_root_ref_dirid(leaf, rref); | |
2817 | found++; | |
2818 | ||
2819 | ret = btrfs_next_item(root, path); | |
2820 | if (ret < 0) { | |
2821 | goto out; | |
2822 | } else if (ret > 0) { | |
2823 | ret = -EUCLEAN; | |
2824 | goto out; | |
2825 | } | |
2826 | } | |
2827 | ||
2828 | out: | |
2829 | if (!ret || ret == -EOVERFLOW) { | |
2830 | rootrefs->num_items = found; | |
2831 | /* update min_treeid for next search */ | |
2832 | if (found) | |
2833 | rootrefs->min_treeid = | |
2834 | rootrefs->rootref[found - 1].treeid + 1; | |
2835 | if (copy_to_user(argp, rootrefs, sizeof(*rootrefs))) | |
2836 | ret = -EFAULT; | |
2837 | } | |
2838 | ||
2839 | kfree(rootrefs); | |
2840 | btrfs_free_path(path); | |
2841 | ||
2842 | return ret; | |
2843 | } | |
2844 | ||
76dda93c | 2845 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
949964c9 MPS |
2846 | void __user *arg, |
2847 | bool destroy_v2) | |
76dda93c | 2848 | { |
54563d41 | 2849 | struct dentry *parent = file->f_path.dentry; |
0b246afa | 2850 | struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb); |
76dda93c | 2851 | struct dentry *dentry; |
2b0143b5 | 2852 | struct inode *dir = d_inode(parent); |
76dda93c YZ |
2853 | struct inode *inode; |
2854 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2855 | struct btrfs_root *dest = NULL; | |
949964c9 MPS |
2856 | struct btrfs_ioctl_vol_args *vol_args = NULL; |
2857 | struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL; | |
c4ed533b | 2858 | struct user_namespace *mnt_userns = file_mnt_user_ns(file); |
949964c9 MPS |
2859 | char *subvol_name, *subvol_name_ptr = NULL; |
2860 | int subvol_namelen; | |
76dda93c | 2861 | int err = 0; |
949964c9 | 2862 | bool destroy_parent = false; |
76dda93c | 2863 | |
949964c9 MPS |
2864 | if (destroy_v2) { |
2865 | vol_args2 = memdup_user(arg, sizeof(*vol_args2)); | |
2866 | if (IS_ERR(vol_args2)) | |
2867 | return PTR_ERR(vol_args2); | |
325c50e3 | 2868 | |
949964c9 MPS |
2869 | if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) { |
2870 | err = -EOPNOTSUPP; | |
2871 | goto out; | |
2872 | } | |
76dda93c | 2873 | |
949964c9 MPS |
2874 | /* |
2875 | * If SPEC_BY_ID is not set, we are looking for the subvolume by | |
2876 | * name, same as v1 currently does. | |
2877 | */ | |
2878 | if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) { | |
2879 | vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0; | |
2880 | subvol_name = vol_args2->name; | |
2881 | ||
2882 | err = mnt_want_write_file(file); | |
2883 | if (err) | |
2884 | goto out; | |
2885 | } else { | |
aabb34e7 | 2886 | struct inode *old_dir; |
c4ed533b | 2887 | |
949964c9 MPS |
2888 | if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) { |
2889 | err = -EINVAL; | |
2890 | goto out; | |
2891 | } | |
2892 | ||
2893 | err = mnt_want_write_file(file); | |
2894 | if (err) | |
2895 | goto out; | |
2896 | ||
2897 | dentry = btrfs_get_dentry(fs_info->sb, | |
2898 | BTRFS_FIRST_FREE_OBJECTID, | |
2899 | vol_args2->subvolid, 0, 0); | |
2900 | if (IS_ERR(dentry)) { | |
2901 | err = PTR_ERR(dentry); | |
2902 | goto out_drop_write; | |
2903 | } | |
2904 | ||
2905 | /* | |
2906 | * Change the default parent since the subvolume being | |
2907 | * deleted can be outside of the current mount point. | |
2908 | */ | |
2909 | parent = btrfs_get_parent(dentry); | |
2910 | ||
2911 | /* | |
2912 | * At this point dentry->d_name can point to '/' if the | |
2913 | * subvolume we want to destroy is outsite of the | |
2914 | * current mount point, so we need to release the | |
2915 | * current dentry and execute the lookup to return a new | |
2916 | * one with ->d_name pointing to the | |
2917 | * <mount point>/subvol_name. | |
2918 | */ | |
2919 | dput(dentry); | |
2920 | if (IS_ERR(parent)) { | |
2921 | err = PTR_ERR(parent); | |
2922 | goto out_drop_write; | |
2923 | } | |
aabb34e7 | 2924 | old_dir = dir; |
949964c9 MPS |
2925 | dir = d_inode(parent); |
2926 | ||
2927 | /* | |
2928 | * If v2 was used with SPEC_BY_ID, a new parent was | |
2929 | * allocated since the subvolume can be outside of the | |
2930 | * current mount point. Later on we need to release this | |
2931 | * new parent dentry. | |
2932 | */ | |
2933 | destroy_parent = true; | |
2934 | ||
aabb34e7 CB |
2935 | /* |
2936 | * On idmapped mounts, deletion via subvolid is | |
2937 | * restricted to subvolumes that are immediate | |
2938 | * ancestors of the inode referenced by the file | |
2939 | * descriptor in the ioctl. Otherwise the idmapping | |
2940 | * could potentially be abused to delete subvolumes | |
2941 | * anywhere in the filesystem the user wouldn't be able | |
2942 | * to delete without an idmapped mount. | |
2943 | */ | |
2944 | if (old_dir != dir && mnt_userns != &init_user_ns) { | |
2945 | err = -EOPNOTSUPP; | |
2946 | goto free_parent; | |
2947 | } | |
2948 | ||
949964c9 MPS |
2949 | subvol_name_ptr = btrfs_get_subvol_name_from_objectid( |
2950 | fs_info, vol_args2->subvolid); | |
2951 | if (IS_ERR(subvol_name_ptr)) { | |
2952 | err = PTR_ERR(subvol_name_ptr); | |
2953 | goto free_parent; | |
2954 | } | |
1a9fd417 | 2955 | /* subvol_name_ptr is already nul terminated */ |
949964c9 MPS |
2956 | subvol_name = (char *)kbasename(subvol_name_ptr); |
2957 | } | |
2958 | } else { | |
2959 | vol_args = memdup_user(arg, sizeof(*vol_args)); | |
2960 | if (IS_ERR(vol_args)) | |
2961 | return PTR_ERR(vol_args); | |
2962 | ||
2963 | vol_args->name[BTRFS_PATH_NAME_MAX] = 0; | |
2964 | subvol_name = vol_args->name; | |
2965 | ||
2966 | err = mnt_want_write_file(file); | |
2967 | if (err) | |
2968 | goto out; | |
76dda93c YZ |
2969 | } |
2970 | ||
949964c9 | 2971 | subvol_namelen = strlen(subvol_name); |
76dda93c | 2972 | |
949964c9 MPS |
2973 | if (strchr(subvol_name, '/') || |
2974 | strncmp(subvol_name, "..", subvol_namelen) == 0) { | |
2975 | err = -EINVAL; | |
2976 | goto free_subvol_name; | |
2977 | } | |
2978 | ||
2979 | if (!S_ISDIR(dir->i_mode)) { | |
2980 | err = -ENOTDIR; | |
2981 | goto free_subvol_name; | |
2982 | } | |
521e0546 | 2983 | |
00235411 AV |
2984 | err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); |
2985 | if (err == -EINTR) | |
949964c9 | 2986 | goto free_subvol_name; |
c4ed533b | 2987 | dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen); |
76dda93c YZ |
2988 | if (IS_ERR(dentry)) { |
2989 | err = PTR_ERR(dentry); | |
2990 | goto out_unlock_dir; | |
2991 | } | |
2992 | ||
2b0143b5 | 2993 | if (d_really_is_negative(dentry)) { |
76dda93c YZ |
2994 | err = -ENOENT; |
2995 | goto out_dput; | |
2996 | } | |
2997 | ||
2b0143b5 | 2998 | inode = d_inode(dentry); |
4260f7c7 | 2999 | dest = BTRFS_I(inode)->root; |
67871254 | 3000 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
3001 | /* |
3002 | * Regular user. Only allow this with a special mount | |
3003 | * option, when the user has write+exec access to the | |
3004 | * subvol root, and when rmdir(2) would have been | |
3005 | * allowed. | |
3006 | * | |
3007 | * Note that this is _not_ check that the subvol is | |
3008 | * empty or doesn't contain data that we wouldn't | |
3009 | * otherwise be able to delete. | |
3010 | * | |
3011 | * Users who want to delete empty subvols should try | |
3012 | * rmdir(2). | |
3013 | */ | |
3014 | err = -EPERM; | |
0b246afa | 3015 | if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED)) |
4260f7c7 SW |
3016 | goto out_dput; |
3017 | ||
3018 | /* | |
3019 | * Do not allow deletion if the parent dir is the same | |
3020 | * as the dir to be deleted. That means the ioctl | |
3021 | * must be called on the dentry referencing the root | |
3022 | * of the subvol, not a random directory contained | |
3023 | * within it. | |
3024 | */ | |
3025 | err = -EINVAL; | |
3026 | if (root == dest) | |
3027 | goto out_dput; | |
3028 | ||
c4ed533b | 3029 | err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC); |
4260f7c7 SW |
3030 | if (err) |
3031 | goto out_dput; | |
4260f7c7 SW |
3032 | } |
3033 | ||
5c39da5b | 3034 | /* check if subvolume may be deleted by a user */ |
c4ed533b | 3035 | err = btrfs_may_delete(mnt_userns, dir, dentry, 1); |
5c39da5b MX |
3036 | if (err) |
3037 | goto out_dput; | |
3038 | ||
4a0cc7ca | 3039 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
3040 | err = -EINVAL; |
3041 | goto out_dput; | |
3042 | } | |
3043 | ||
64708539 | 3044 | btrfs_inode_lock(inode, 0); |
f60a2364 | 3045 | err = btrfs_delete_subvolume(dir, dentry); |
64708539 | 3046 | btrfs_inode_unlock(inode, 0); |
46008d9d AG |
3047 | if (!err) { |
3048 | fsnotify_rmdir(dir, dentry); | |
76dda93c | 3049 | d_delete(dentry); |
46008d9d | 3050 | } |
fa6ac876 | 3051 | |
76dda93c YZ |
3052 | out_dput: |
3053 | dput(dentry); | |
3054 | out_unlock_dir: | |
64708539 | 3055 | btrfs_inode_unlock(dir, 0); |
949964c9 MPS |
3056 | free_subvol_name: |
3057 | kfree(subvol_name_ptr); | |
3058 | free_parent: | |
3059 | if (destroy_parent) | |
3060 | dput(parent); | |
00235411 | 3061 | out_drop_write: |
2a79f17e | 3062 | mnt_drop_write_file(file); |
76dda93c | 3063 | out: |
949964c9 | 3064 | kfree(vol_args2); |
76dda93c YZ |
3065 | kfree(vol_args); |
3066 | return err; | |
3067 | } | |
3068 | ||
1e701a32 | 3069 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 3070 | { |
496ad9aa | 3071 | struct inode *inode = file_inode(file); |
f46b5a66 | 3072 | struct btrfs_root *root = BTRFS_I(inode)->root; |
c853a578 | 3073 | struct btrfs_ioctl_defrag_range_args range = {0}; |
c146afad YZ |
3074 | int ret; |
3075 | ||
25122d15 ID |
3076 | ret = mnt_want_write_file(file); |
3077 | if (ret) | |
3078 | return ret; | |
b83cc969 | 3079 | |
25122d15 ID |
3080 | if (btrfs_root_readonly(root)) { |
3081 | ret = -EROFS; | |
3082 | goto out; | |
5ac00add | 3083 | } |
f46b5a66 CH |
3084 | |
3085 | switch (inode->i_mode & S_IFMT) { | |
3086 | case S_IFDIR: | |
e441d54d CM |
3087 | if (!capable(CAP_SYS_ADMIN)) { |
3088 | ret = -EPERM; | |
3089 | goto out; | |
3090 | } | |
de78b51a | 3091 | ret = btrfs_defrag_root(root); |
f46b5a66 CH |
3092 | break; |
3093 | case S_IFREG: | |
616d374e AB |
3094 | /* |
3095 | * Note that this does not check the file descriptor for write | |
3096 | * access. This prevents defragmenting executables that are | |
3097 | * running and allows defrag on files open in read-only mode. | |
3098 | */ | |
3099 | if (!capable(CAP_SYS_ADMIN) && | |
47291baa | 3100 | inode_permission(&init_user_ns, inode, MAY_WRITE)) { |
616d374e | 3101 | ret = -EPERM; |
e441d54d CM |
3102 | goto out; |
3103 | } | |
1e701a32 | 3104 | |
1e701a32 | 3105 | if (argp) { |
c853a578 | 3106 | if (copy_from_user(&range, argp, sizeof(range))) { |
1e701a32 | 3107 | ret = -EFAULT; |
683be16e | 3108 | goto out; |
1e701a32 CM |
3109 | } |
3110 | /* compression requires us to start the IO */ | |
c853a578 GR |
3111 | if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
3112 | range.flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
3113 | range.extent_thresh = (u32)-1; | |
1e701a32 CM |
3114 | } |
3115 | } else { | |
3116 | /* the rest are all set to zero by kzalloc */ | |
c853a578 | 3117 | range.len = (u64)-1; |
1e701a32 | 3118 | } |
1ccc2e8a | 3119 | ret = btrfs_defrag_file(file_inode(file), &file->f_ra, |
c853a578 | 3120 | &range, BTRFS_OLDEST_GENERATION, 0); |
4cb5300b CM |
3121 | if (ret > 0) |
3122 | ret = 0; | |
f46b5a66 | 3123 | break; |
8929ecfa YZ |
3124 | default: |
3125 | ret = -EINVAL; | |
f46b5a66 | 3126 | } |
e441d54d | 3127 | out: |
25122d15 | 3128 | mnt_drop_write_file(file); |
e441d54d | 3129 | return ret; |
f46b5a66 CH |
3130 | } |
3131 | ||
2ff7e61e | 3132 | static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg) |
f46b5a66 CH |
3133 | { |
3134 | struct btrfs_ioctl_vol_args *vol_args; | |
3135 | int ret; | |
3136 | ||
e441d54d CM |
3137 | if (!capable(CAP_SYS_ADMIN)) |
3138 | return -EPERM; | |
3139 | ||
c3e1f96c | 3140 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) |
e57138b3 | 3141 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b | 3142 | |
dae7b665 | 3143 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
3144 | if (IS_ERR(vol_args)) { |
3145 | ret = PTR_ERR(vol_args); | |
3146 | goto out; | |
3147 | } | |
f46b5a66 | 3148 | |
5516e595 | 3149 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
2ff7e61e | 3150 | ret = btrfs_init_new_device(fs_info, vol_args->name); |
f46b5a66 | 3151 | |
43d20761 | 3152 | if (!ret) |
0b246afa | 3153 | btrfs_info(fs_info, "disk added %s", vol_args->name); |
43d20761 | 3154 | |
f46b5a66 | 3155 | kfree(vol_args); |
c9e9f97b | 3156 | out: |
c3e1f96c | 3157 | btrfs_exclop_finish(fs_info); |
f46b5a66 CH |
3158 | return ret; |
3159 | } | |
3160 | ||
6b526ed7 | 3161 | static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg) |
f46b5a66 | 3162 | { |
0b246afa JM |
3163 | struct inode *inode = file_inode(file); |
3164 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
6b526ed7 | 3165 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
3fa421de JB |
3166 | struct block_device *bdev = NULL; |
3167 | fmode_t mode; | |
f46b5a66 | 3168 | int ret; |
67ae34b6 | 3169 | bool cancel = false; |
f46b5a66 | 3170 | |
e441d54d CM |
3171 | if (!capable(CAP_SYS_ADMIN)) |
3172 | return -EPERM; | |
3173 | ||
da24927b MX |
3174 | ret = mnt_want_write_file(file); |
3175 | if (ret) | |
3176 | return ret; | |
c146afad | 3177 | |
dae7b665 | 3178 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
3179 | if (IS_ERR(vol_args)) { |
3180 | ret = PTR_ERR(vol_args); | |
c47ca32d | 3181 | goto err_drop; |
c9e9f97b | 3182 | } |
f46b5a66 | 3183 | |
748449cd | 3184 | if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) { |
fd4e994b OS |
3185 | ret = -EOPNOTSUPP; |
3186 | goto out; | |
3187 | } | |
67ae34b6 DS |
3188 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; |
3189 | if (!(vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) && | |
3190 | strcmp("cancel", vol_args->name) == 0) | |
3191 | cancel = true; | |
f46b5a66 | 3192 | |
67ae34b6 DS |
3193 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, |
3194 | cancel); | |
3195 | if (ret) | |
183860f6 | 3196 | goto out; |
67ae34b6 | 3197 | /* Exclusive operation is now claimed */ |
183860f6 | 3198 | |
67ae34b6 | 3199 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) |
3fa421de | 3200 | ret = btrfs_rm_device(fs_info, NULL, vol_args->devid, &bdev, &mode); |
67ae34b6 | 3201 | else |
3fa421de | 3202 | ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); |
67ae34b6 | 3203 | |
c3e1f96c | 3204 | btrfs_exclop_finish(fs_info); |
183860f6 | 3205 | |
6b526ed7 | 3206 | if (!ret) { |
735654ea | 3207 | if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) |
0b246afa | 3208 | btrfs_info(fs_info, "device deleted: id %llu", |
6b526ed7 AJ |
3209 | vol_args->devid); |
3210 | else | |
0b246afa | 3211 | btrfs_info(fs_info, "device deleted: %s", |
6b526ed7 AJ |
3212 | vol_args->name); |
3213 | } | |
183860f6 AJ |
3214 | out: |
3215 | kfree(vol_args); | |
c47ca32d | 3216 | err_drop: |
4ac20c70 | 3217 | mnt_drop_write_file(file); |
3fa421de JB |
3218 | if (bdev) |
3219 | blkdev_put(bdev, mode); | |
f46b5a66 CH |
3220 | return ret; |
3221 | } | |
3222 | ||
da24927b | 3223 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 3224 | { |
0b246afa JM |
3225 | struct inode *inode = file_inode(file); |
3226 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
f46b5a66 | 3227 | struct btrfs_ioctl_vol_args *vol_args; |
3fa421de JB |
3228 | struct block_device *bdev = NULL; |
3229 | fmode_t mode; | |
f46b5a66 | 3230 | int ret; |
67ae34b6 | 3231 | bool cancel; |
f46b5a66 | 3232 | |
e441d54d CM |
3233 | if (!capable(CAP_SYS_ADMIN)) |
3234 | return -EPERM; | |
3235 | ||
da24927b MX |
3236 | ret = mnt_want_write_file(file); |
3237 | if (ret) | |
3238 | return ret; | |
c146afad | 3239 | |
58d7bbf8 DS |
3240 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
3241 | if (IS_ERR(vol_args)) { | |
3242 | ret = PTR_ERR(vol_args); | |
67ae34b6 | 3243 | goto out_drop_write; |
183860f6 | 3244 | } |
58d7bbf8 | 3245 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
67ae34b6 DS |
3246 | cancel = (strcmp("cancel", vol_args->name) == 0); |
3247 | ||
3248 | ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE, | |
3249 | cancel); | |
3250 | if (ret == 0) { | |
3fa421de | 3251 | ret = btrfs_rm_device(fs_info, vol_args->name, 0, &bdev, &mode); |
67ae34b6 DS |
3252 | if (!ret) |
3253 | btrfs_info(fs_info, "disk deleted %s", vol_args->name); | |
3254 | btrfs_exclop_finish(fs_info); | |
3255 | } | |
183860f6 | 3256 | |
183860f6 | 3257 | kfree(vol_args); |
58d7bbf8 | 3258 | out_drop_write: |
4ac20c70 | 3259 | mnt_drop_write_file(file); |
3fa421de JB |
3260 | if (bdev) |
3261 | blkdev_put(bdev, mode); | |
f46b5a66 CH |
3262 | return ret; |
3263 | } | |
3264 | ||
2ff7e61e JM |
3265 | static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info, |
3266 | void __user *arg) | |
475f6387 | 3267 | { |
027ed2f0 | 3268 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 | 3269 | struct btrfs_device *device; |
0b246afa | 3270 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
137c5418 | 3271 | u64 flags_in; |
027ed2f0 | 3272 | int ret = 0; |
475f6387 | 3273 | |
137c5418 JT |
3274 | fi_args = memdup_user(arg, sizeof(*fi_args)); |
3275 | if (IS_ERR(fi_args)) | |
3276 | return PTR_ERR(fi_args); | |
3277 | ||
3278 | flags_in = fi_args->flags; | |
3279 | memset(fi_args, 0, sizeof(*fi_args)); | |
027ed2f0 | 3280 | |
d03262c7 | 3281 | rcu_read_lock(); |
027ed2f0 | 3282 | fi_args->num_devices = fs_devices->num_devices; |
475f6387 | 3283 | |
d03262c7 | 3284 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
3285 | if (device->devid > fi_args->max_id) |
3286 | fi_args->max_id = device->devid; | |
475f6387 | 3287 | } |
d03262c7 | 3288 | rcu_read_unlock(); |
475f6387 | 3289 | |
de37aa51 | 3290 | memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid)); |
bea7eafd OS |
3291 | fi_args->nodesize = fs_info->nodesize; |
3292 | fi_args->sectorsize = fs_info->sectorsize; | |
3293 | fi_args->clone_alignment = fs_info->sectorsize; | |
80a773fb | 3294 | |
137c5418 JT |
3295 | if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) { |
3296 | fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
3297 | fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
3298 | fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO; | |
3299 | } | |
3300 | ||
0fb408a5 JT |
3301 | if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) { |
3302 | fi_args->generation = fs_info->generation; | |
3303 | fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION; | |
3304 | } | |
3305 | ||
49bac897 JT |
3306 | if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) { |
3307 | memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid, | |
3308 | sizeof(fi_args->metadata_uuid)); | |
3309 | fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID; | |
3310 | } | |
3311 | ||
027ed2f0 LZ |
3312 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
3313 | ret = -EFAULT; | |
475f6387 | 3314 | |
027ed2f0 LZ |
3315 | kfree(fi_args); |
3316 | return ret; | |
475f6387 JS |
3317 | } |
3318 | ||
2ff7e61e JM |
3319 | static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, |
3320 | void __user *arg) | |
475f6387 | 3321 | { |
562d7b15 | 3322 | BTRFS_DEV_LOOKUP_ARGS(args); |
475f6387 JS |
3323 | struct btrfs_ioctl_dev_info_args *di_args; |
3324 | struct btrfs_device *dev; | |
475f6387 | 3325 | int ret = 0; |
475f6387 | 3326 | |
475f6387 JS |
3327 | di_args = memdup_user(arg, sizeof(*di_args)); |
3328 | if (IS_ERR(di_args)) | |
3329 | return PTR_ERR(di_args); | |
3330 | ||
562d7b15 | 3331 | args.devid = di_args->devid; |
dd5f9615 | 3332 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
562d7b15 | 3333 | args.uuid = di_args->uuid; |
475f6387 | 3334 | |
c5593ca3 | 3335 | rcu_read_lock(); |
562d7b15 | 3336 | dev = btrfs_find_device(fs_info->fs_devices, &args); |
475f6387 JS |
3337 | if (!dev) { |
3338 | ret = -ENODEV; | |
3339 | goto out; | |
3340 | } | |
3341 | ||
3342 | di_args->devid = dev->devid; | |
7cc8e58d MX |
3343 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
3344 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 3345 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
a27202fb | 3346 | if (dev->name) { |
672d5990 MT |
3347 | strncpy(di_args->path, rcu_str_deref(dev->name), |
3348 | sizeof(di_args->path) - 1); | |
a27202fb JM |
3349 | di_args->path[sizeof(di_args->path) - 1] = 0; |
3350 | } else { | |
99ba55ad | 3351 | di_args->path[0] = '\0'; |
a27202fb | 3352 | } |
475f6387 JS |
3353 | |
3354 | out: | |
c5593ca3 | 3355 | rcu_read_unlock(); |
475f6387 JS |
3356 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
3357 | ret = -EFAULT; | |
3358 | ||
3359 | kfree(di_args); | |
3360 | return ret; | |
3361 | } | |
3362 | ||
6ef5ed0d JB |
3363 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
3364 | { | |
496ad9aa | 3365 | struct inode *inode = file_inode(file); |
0b246afa | 3366 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
6ef5ed0d JB |
3367 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3368 | struct btrfs_root *new_root; | |
3369 | struct btrfs_dir_item *di; | |
3370 | struct btrfs_trans_handle *trans; | |
2a2b5d62 | 3371 | struct btrfs_path *path = NULL; |
6ef5ed0d | 3372 | struct btrfs_disk_key disk_key; |
6ef5ed0d JB |
3373 | u64 objectid = 0; |
3374 | u64 dir_id; | |
3c04ce01 | 3375 | int ret; |
6ef5ed0d JB |
3376 | |
3377 | if (!capable(CAP_SYS_ADMIN)) | |
3378 | return -EPERM; | |
3379 | ||
3c04ce01 MX |
3380 | ret = mnt_want_write_file(file); |
3381 | if (ret) | |
3382 | return ret; | |
3383 | ||
3384 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
3385 | ret = -EFAULT; | |
3386 | goto out; | |
3387 | } | |
6ef5ed0d JB |
3388 | |
3389 | if (!objectid) | |
1cecf579 | 3390 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d | 3391 | |
56e9357a | 3392 | new_root = btrfs_get_fs_root(fs_info, objectid, true); |
3c04ce01 MX |
3393 | if (IS_ERR(new_root)) { |
3394 | ret = PTR_ERR(new_root); | |
3395 | goto out; | |
3396 | } | |
2a2b5d62 JB |
3397 | if (!is_fstree(new_root->root_key.objectid)) { |
3398 | ret = -ENOENT; | |
3399 | goto out_free; | |
3400 | } | |
6ef5ed0d | 3401 | |
6ef5ed0d | 3402 | path = btrfs_alloc_path(); |
3c04ce01 MX |
3403 | if (!path) { |
3404 | ret = -ENOMEM; | |
2a2b5d62 | 3405 | goto out_free; |
3c04ce01 | 3406 | } |
6ef5ed0d JB |
3407 | |
3408 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 3409 | if (IS_ERR(trans)) { |
3c04ce01 | 3410 | ret = PTR_ERR(trans); |
2a2b5d62 | 3411 | goto out_free; |
6ef5ed0d JB |
3412 | } |
3413 | ||
0b246afa JM |
3414 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
3415 | di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path, | |
6ef5ed0d | 3416 | dir_id, "default", 7, 1); |
cf1e99a4 | 3417 | if (IS_ERR_OR_NULL(di)) { |
2a2b5d62 | 3418 | btrfs_release_path(path); |
3a45bb20 | 3419 | btrfs_end_transaction(trans); |
0b246afa | 3420 | btrfs_err(fs_info, |
5d163e0e | 3421 | "Umm, you don't have the default diritem, this isn't going to work"); |
3c04ce01 | 3422 | ret = -ENOENT; |
2a2b5d62 | 3423 | goto out_free; |
6ef5ed0d JB |
3424 | } |
3425 | ||
3426 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
3427 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
3428 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2a2b5d62 | 3429 | btrfs_release_path(path); |
6ef5ed0d | 3430 | |
0b246afa | 3431 | btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL); |
3a45bb20 | 3432 | btrfs_end_transaction(trans); |
2a2b5d62 | 3433 | out_free: |
00246528 | 3434 | btrfs_put_root(new_root); |
2a2b5d62 | 3435 | btrfs_free_path(path); |
3c04ce01 MX |
3436 | out: |
3437 | mnt_drop_write_file(file); | |
3438 | return ret; | |
6ef5ed0d JB |
3439 | } |
3440 | ||
c065f5b1 SY |
3441 | static void get_block_group_info(struct list_head *groups_list, |
3442 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 | 3443 | { |
32da5386 | 3444 | struct btrfs_block_group *block_group; |
bf5fc093 JB |
3445 | |
3446 | space->total_bytes = 0; | |
3447 | space->used_bytes = 0; | |
3448 | space->flags = 0; | |
3449 | list_for_each_entry(block_group, groups_list, list) { | |
3450 | space->flags = block_group->flags; | |
b3470b5d | 3451 | space->total_bytes += block_group->length; |
bf38be65 | 3452 | space->used_bytes += block_group->used; |
bf5fc093 JB |
3453 | } |
3454 | } | |
3455 | ||
2ff7e61e JM |
3456 | static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info, |
3457 | void __user *arg) | |
1406e432 JB |
3458 | { |
3459 | struct btrfs_ioctl_space_args space_args; | |
3460 | struct btrfs_ioctl_space_info space; | |
3461 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 3462 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 3463 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 3464 | struct btrfs_space_info *info; |
315d8e98 CIK |
3465 | static const u64 types[] = { |
3466 | BTRFS_BLOCK_GROUP_DATA, | |
3467 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3468 | BTRFS_BLOCK_GROUP_METADATA, | |
3469 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA | |
3470 | }; | |
bf5fc093 | 3471 | int num_types = 4; |
7fde62bf | 3472 | int alloc_size; |
1406e432 | 3473 | int ret = 0; |
51788b1b | 3474 | u64 slot_count = 0; |
bf5fc093 | 3475 | int i, c; |
1406e432 JB |
3476 | |
3477 | if (copy_from_user(&space_args, | |
3478 | (struct btrfs_ioctl_space_args __user *)arg, | |
3479 | sizeof(space_args))) | |
3480 | return -EFAULT; | |
3481 | ||
bf5fc093 JB |
3482 | for (i = 0; i < num_types; i++) { |
3483 | struct btrfs_space_info *tmp; | |
3484 | ||
3485 | info = NULL; | |
72804905 | 3486 | list_for_each_entry(tmp, &fs_info->space_info, list) { |
bf5fc093 JB |
3487 | if (tmp->flags == types[i]) { |
3488 | info = tmp; | |
3489 | break; | |
3490 | } | |
3491 | } | |
bf5fc093 JB |
3492 | |
3493 | if (!info) | |
3494 | continue; | |
3495 | ||
3496 | down_read(&info->groups_sem); | |
3497 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3498 | if (!list_empty(&info->block_groups[c])) | |
3499 | slot_count++; | |
3500 | } | |
3501 | up_read(&info->groups_sem); | |
3502 | } | |
7fde62bf | 3503 | |
36523e95 DS |
3504 | /* |
3505 | * Global block reserve, exported as a space_info | |
3506 | */ | |
3507 | slot_count++; | |
3508 | ||
7fde62bf CM |
3509 | /* space_slots == 0 means they are asking for a count */ |
3510 | if (space_args.space_slots == 0) { | |
3511 | space_args.total_spaces = slot_count; | |
3512 | goto out; | |
3513 | } | |
bf5fc093 | 3514 | |
51788b1b | 3515 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3516 | |
7fde62bf | 3517 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3518 | |
7fde62bf CM |
3519 | /* we generally have at most 6 or so space infos, one for each raid |
3520 | * level. So, a whole page should be more than enough for everyone | |
3521 | */ | |
09cbfeaf | 3522 | if (alloc_size > PAGE_SIZE) |
7fde62bf CM |
3523 | return -ENOMEM; |
3524 | ||
1406e432 | 3525 | space_args.total_spaces = 0; |
8d2db785 | 3526 | dest = kmalloc(alloc_size, GFP_KERNEL); |
7fde62bf CM |
3527 | if (!dest) |
3528 | return -ENOMEM; | |
3529 | dest_orig = dest; | |
1406e432 | 3530 | |
7fde62bf | 3531 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3532 | for (i = 0; i < num_types; i++) { |
3533 | struct btrfs_space_info *tmp; | |
3534 | ||
51788b1b DR |
3535 | if (!slot_count) |
3536 | break; | |
3537 | ||
bf5fc093 | 3538 | info = NULL; |
72804905 | 3539 | list_for_each_entry(tmp, &fs_info->space_info, list) { |
bf5fc093 JB |
3540 | if (tmp->flags == types[i]) { |
3541 | info = tmp; | |
3542 | break; | |
3543 | } | |
3544 | } | |
7fde62bf | 3545 | |
bf5fc093 JB |
3546 | if (!info) |
3547 | continue; | |
3548 | down_read(&info->groups_sem); | |
3549 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3550 | if (!list_empty(&info->block_groups[c])) { | |
c065f5b1 SY |
3551 | get_block_group_info(&info->block_groups[c], |
3552 | &space); | |
bf5fc093 JB |
3553 | memcpy(dest, &space, sizeof(space)); |
3554 | dest++; | |
3555 | space_args.total_spaces++; | |
51788b1b | 3556 | slot_count--; |
bf5fc093 | 3557 | } |
51788b1b DR |
3558 | if (!slot_count) |
3559 | break; | |
bf5fc093 JB |
3560 | } |
3561 | up_read(&info->groups_sem); | |
1406e432 | 3562 | } |
1406e432 | 3563 | |
36523e95 DS |
3564 | /* |
3565 | * Add global block reserve | |
3566 | */ | |
3567 | if (slot_count) { | |
0b246afa | 3568 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
36523e95 DS |
3569 | |
3570 | spin_lock(&block_rsv->lock); | |
3571 | space.total_bytes = block_rsv->size; | |
3572 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
3573 | spin_unlock(&block_rsv->lock); | |
3574 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
3575 | memcpy(dest, &space, sizeof(space)); | |
3576 | space_args.total_spaces++; | |
3577 | } | |
3578 | ||
2eec6c81 | 3579 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3580 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3581 | ||
3582 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3583 | ret = -EFAULT; | |
3584 | ||
3585 | kfree(dest_orig); | |
3586 | out: | |
3587 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3588 | ret = -EFAULT; |
3589 | ||
3590 | return ret; | |
3591 | } | |
3592 | ||
9a8c28be MX |
3593 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3594 | void __user *argp) | |
46204592 | 3595 | { |
46204592 SW |
3596 | struct btrfs_trans_handle *trans; |
3597 | u64 transid; | |
db5b493a | 3598 | int ret; |
46204592 | 3599 | |
d4edf39b | 3600 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
3601 | if (IS_ERR(trans)) { |
3602 | if (PTR_ERR(trans) != -ENOENT) | |
3603 | return PTR_ERR(trans); | |
3604 | ||
3605 | /* No running transaction, don't bother */ | |
3606 | transid = root->fs_info->last_trans_committed; | |
3607 | goto out; | |
3608 | } | |
46204592 | 3609 | transid = trans->transid; |
32cc4f87 | 3610 | ret = btrfs_commit_transaction_async(trans); |
8b2b2d3c | 3611 | if (ret) { |
3a45bb20 | 3612 | btrfs_end_transaction(trans); |
db5b493a | 3613 | return ret; |
8b2b2d3c | 3614 | } |
ff7c1d33 | 3615 | out: |
46204592 SW |
3616 | if (argp) |
3617 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3618 | return -EFAULT; | |
3619 | return 0; | |
3620 | } | |
3621 | ||
2ff7e61e | 3622 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info, |
9a8c28be | 3623 | void __user *argp) |
46204592 | 3624 | { |
46204592 SW |
3625 | u64 transid; |
3626 | ||
3627 | if (argp) { | |
3628 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3629 | return -EFAULT; | |
3630 | } else { | |
3631 | transid = 0; /* current trans */ | |
3632 | } | |
2ff7e61e | 3633 | return btrfs_wait_for_commit(fs_info, transid); |
46204592 SW |
3634 | } |
3635 | ||
b8e95489 | 3636 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 3637 | { |
0b246afa | 3638 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
475f6387 | 3639 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 3640 | int ret; |
475f6387 JS |
3641 | |
3642 | if (!capable(CAP_SYS_ADMIN)) | |
3643 | return -EPERM; | |
3644 | ||
3645 | sa = memdup_user(arg, sizeof(*sa)); | |
3646 | if (IS_ERR(sa)) | |
3647 | return PTR_ERR(sa); | |
3648 | ||
b8e95489 MX |
3649 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
3650 | ret = mnt_want_write_file(file); | |
3651 | if (ret) | |
3652 | goto out; | |
3653 | } | |
3654 | ||
0b246afa | 3655 | ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3656 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3657 | 0); | |
475f6387 | 3658 | |
5afe6ce7 FM |
3659 | /* |
3660 | * Copy scrub args to user space even if btrfs_scrub_dev() returned an | |
3661 | * error. This is important as it allows user space to know how much | |
3662 | * progress scrub has done. For example, if scrub is canceled we get | |
3663 | * -ECANCELED from btrfs_scrub_dev() and return that error back to user | |
3664 | * space. Later user space can inspect the progress from the structure | |
3665 | * btrfs_ioctl_scrub_args and resume scrub from where it left off | |
3666 | * previously (btrfs-progs does this). | |
3667 | * If we fail to copy the btrfs_ioctl_scrub_args structure to user space | |
3668 | * then return -EFAULT to signal the structure was not copied or it may | |
3669 | * be corrupt and unreliable due to a partial copy. | |
3670 | */ | |
3671 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
475f6387 JS |
3672 | ret = -EFAULT; |
3673 | ||
b8e95489 MX |
3674 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
3675 | mnt_drop_write_file(file); | |
3676 | out: | |
475f6387 JS |
3677 | kfree(sa); |
3678 | return ret; | |
3679 | } | |
3680 | ||
2ff7e61e | 3681 | static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info) |
475f6387 JS |
3682 | { |
3683 | if (!capable(CAP_SYS_ADMIN)) | |
3684 | return -EPERM; | |
3685 | ||
2ff7e61e | 3686 | return btrfs_scrub_cancel(fs_info); |
475f6387 JS |
3687 | } |
3688 | ||
2ff7e61e | 3689 | static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, |
475f6387 JS |
3690 | void __user *arg) |
3691 | { | |
3692 | struct btrfs_ioctl_scrub_args *sa; | |
3693 | int ret; | |
3694 | ||
3695 | if (!capable(CAP_SYS_ADMIN)) | |
3696 | return -EPERM; | |
3697 | ||
3698 | sa = memdup_user(arg, sizeof(*sa)); | |
3699 | if (IS_ERR(sa)) | |
3700 | return PTR_ERR(sa); | |
3701 | ||
2ff7e61e | 3702 | ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); |
475f6387 | 3703 | |
4fa99b00 | 3704 | if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) |
475f6387 JS |
3705 | ret = -EFAULT; |
3706 | ||
3707 | kfree(sa); | |
3708 | return ret; | |
3709 | } | |
3710 | ||
2ff7e61e | 3711 | static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info, |
b27f7c0c | 3712 | void __user *arg) |
c11d2c23 SB |
3713 | { |
3714 | struct btrfs_ioctl_get_dev_stats *sa; | |
3715 | int ret; | |
3716 | ||
c11d2c23 SB |
3717 | sa = memdup_user(arg, sizeof(*sa)); |
3718 | if (IS_ERR(sa)) | |
3719 | return PTR_ERR(sa); | |
3720 | ||
b27f7c0c DS |
3721 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3722 | kfree(sa); | |
3723 | return -EPERM; | |
3724 | } | |
3725 | ||
2ff7e61e | 3726 | ret = btrfs_get_dev_stats(fs_info, sa); |
c11d2c23 | 3727 | |
eee99577 | 3728 | if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) |
c11d2c23 SB |
3729 | ret = -EFAULT; |
3730 | ||
3731 | kfree(sa); | |
3732 | return ret; | |
3733 | } | |
3734 | ||
2ff7e61e JM |
3735 | static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info, |
3736 | void __user *arg) | |
3f6bcfbd SB |
3737 | { |
3738 | struct btrfs_ioctl_dev_replace_args *p; | |
3739 | int ret; | |
3740 | ||
3741 | if (!capable(CAP_SYS_ADMIN)) | |
3742 | return -EPERM; | |
3743 | ||
3744 | p = memdup_user(arg, sizeof(*p)); | |
3745 | if (IS_ERR(p)) | |
3746 | return PTR_ERR(p); | |
3747 | ||
3748 | switch (p->cmd) { | |
3749 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
bc98a42c | 3750 | if (sb_rdonly(fs_info->sb)) { |
adfa97cb ID |
3751 | ret = -EROFS; |
3752 | goto out; | |
3753 | } | |
c3e1f96c | 3754 | if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) { |
e57138b3 | 3755 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd | 3756 | } else { |
2ff7e61e | 3757 | ret = btrfs_dev_replace_by_ioctl(fs_info, p); |
c3e1f96c | 3758 | btrfs_exclop_finish(fs_info); |
3f6bcfbd SB |
3759 | } |
3760 | break; | |
3761 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
0b246afa | 3762 | btrfs_dev_replace_status(fs_info, p); |
3f6bcfbd SB |
3763 | ret = 0; |
3764 | break; | |
3765 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
17d202b9 | 3766 | p->result = btrfs_dev_replace_cancel(fs_info); |
97282031 | 3767 | ret = 0; |
3f6bcfbd SB |
3768 | break; |
3769 | default: | |
3770 | ret = -EINVAL; | |
3771 | break; | |
3772 | } | |
3773 | ||
d3a53286 | 3774 | if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p))) |
3f6bcfbd | 3775 | ret = -EFAULT; |
adfa97cb | 3776 | out: |
3f6bcfbd SB |
3777 | kfree(p); |
3778 | return ret; | |
3779 | } | |
3780 | ||
d7728c96 JS |
3781 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3782 | { | |
3783 | int ret = 0; | |
3784 | int i; | |
740c3d22 | 3785 | u64 rel_ptr; |
d7728c96 | 3786 | int size; |
806468f8 | 3787 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3788 | struct inode_fs_paths *ipath = NULL; |
3789 | struct btrfs_path *path; | |
3790 | ||
82b22ac8 | 3791 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
3792 | return -EPERM; |
3793 | ||
3794 | path = btrfs_alloc_path(); | |
3795 | if (!path) { | |
3796 | ret = -ENOMEM; | |
3797 | goto out; | |
3798 | } | |
3799 | ||
3800 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3801 | if (IS_ERR(ipa)) { | |
3802 | ret = PTR_ERR(ipa); | |
3803 | ipa = NULL; | |
3804 | goto out; | |
3805 | } | |
3806 | ||
3807 | size = min_t(u32, ipa->size, 4096); | |
3808 | ipath = init_ipath(size, root, path); | |
3809 | if (IS_ERR(ipath)) { | |
3810 | ret = PTR_ERR(ipath); | |
3811 | ipath = NULL; | |
3812 | goto out; | |
3813 | } | |
3814 | ||
3815 | ret = paths_from_inode(ipa->inum, ipath); | |
3816 | if (ret < 0) | |
3817 | goto out; | |
3818 | ||
3819 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3820 | rel_ptr = ipath->fspath->val[i] - |
3821 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3822 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3823 | } |
3824 | ||
718dc5fa OS |
3825 | ret = copy_to_user((void __user *)(unsigned long)ipa->fspath, |
3826 | ipath->fspath, size); | |
d7728c96 JS |
3827 | if (ret) { |
3828 | ret = -EFAULT; | |
3829 | goto out; | |
3830 | } | |
3831 | ||
3832 | out: | |
3833 | btrfs_free_path(path); | |
3834 | free_ipath(ipath); | |
3835 | kfree(ipa); | |
3836 | ||
3837 | return ret; | |
3838 | } | |
3839 | ||
3840 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
3841 | { | |
3842 | struct btrfs_data_container *inodes = ctx; | |
3843 | const size_t c = 3 * sizeof(u64); | |
3844 | ||
3845 | if (inodes->bytes_left >= c) { | |
3846 | inodes->bytes_left -= c; | |
3847 | inodes->val[inodes->elem_cnt] = inum; | |
3848 | inodes->val[inodes->elem_cnt + 1] = offset; | |
3849 | inodes->val[inodes->elem_cnt + 2] = root; | |
3850 | inodes->elem_cnt += 3; | |
3851 | } else { | |
3852 | inodes->bytes_missing += c - inodes->bytes_left; | |
3853 | inodes->bytes_left = 0; | |
3854 | inodes->elem_missed += 3; | |
3855 | } | |
3856 | ||
3857 | return 0; | |
3858 | } | |
3859 | ||
2ff7e61e | 3860 | static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info, |
d24a67b2 | 3861 | void __user *arg, int version) |
d7728c96 JS |
3862 | { |
3863 | int ret = 0; | |
3864 | int size; | |
d7728c96 JS |
3865 | struct btrfs_ioctl_logical_ino_args *loi; |
3866 | struct btrfs_data_container *inodes = NULL; | |
3867 | struct btrfs_path *path = NULL; | |
d24a67b2 | 3868 | bool ignore_offset; |
d7728c96 JS |
3869 | |
3870 | if (!capable(CAP_SYS_ADMIN)) | |
3871 | return -EPERM; | |
3872 | ||
3873 | loi = memdup_user(arg, sizeof(*loi)); | |
7b9ea627 SV |
3874 | if (IS_ERR(loi)) |
3875 | return PTR_ERR(loi); | |
d7728c96 | 3876 | |
d24a67b2 ZB |
3877 | if (version == 1) { |
3878 | ignore_offset = false; | |
b115e3bc | 3879 | size = min_t(u32, loi->size, SZ_64K); |
d24a67b2 ZB |
3880 | } else { |
3881 | /* All reserved bits must be 0 for now */ | |
3882 | if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) { | |
3883 | ret = -EINVAL; | |
3884 | goto out_loi; | |
3885 | } | |
3886 | /* Only accept flags we have defined so far */ | |
3887 | if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) { | |
3888 | ret = -EINVAL; | |
3889 | goto out_loi; | |
3890 | } | |
3891 | ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; | |
b115e3bc | 3892 | size = min_t(u32, loi->size, SZ_16M); |
d24a67b2 ZB |
3893 | } |
3894 | ||
d7728c96 JS |
3895 | path = btrfs_alloc_path(); |
3896 | if (!path) { | |
3897 | ret = -ENOMEM; | |
3898 | goto out; | |
3899 | } | |
3900 | ||
d7728c96 JS |
3901 | inodes = init_data_container(size); |
3902 | if (IS_ERR(inodes)) { | |
3903 | ret = PTR_ERR(inodes); | |
3904 | inodes = NULL; | |
3905 | goto out; | |
3906 | } | |
3907 | ||
2ff7e61e | 3908 | ret = iterate_inodes_from_logical(loi->logical, fs_info, path, |
d24a67b2 | 3909 | build_ino_list, inodes, ignore_offset); |
df031f07 | 3910 | if (ret == -EINVAL) |
d7728c96 JS |
3911 | ret = -ENOENT; |
3912 | if (ret < 0) | |
3913 | goto out; | |
3914 | ||
718dc5fa OS |
3915 | ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes, |
3916 | size); | |
d7728c96 JS |
3917 | if (ret) |
3918 | ret = -EFAULT; | |
3919 | ||
3920 | out: | |
3921 | btrfs_free_path(path); | |
f54de068 | 3922 | kvfree(inodes); |
d24a67b2 | 3923 | out_loi: |
d7728c96 JS |
3924 | kfree(loi); |
3925 | ||
3926 | return ret; | |
3927 | } | |
3928 | ||
008ef096 | 3929 | void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, |
c9e9f97b ID |
3930 | struct btrfs_ioctl_balance_args *bargs) |
3931 | { | |
3932 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3933 | ||
3934 | bargs->flags = bctl->flags; | |
3935 | ||
3009a62f | 3936 | if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) |
837d5b6e ID |
3937 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; |
3938 | if (atomic_read(&fs_info->balance_pause_req)) | |
3939 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3940 | if (atomic_read(&fs_info->balance_cancel_req)) |
3941 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3942 | |
c9e9f97b ID |
3943 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3944 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3945 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce | 3946 | |
008ef096 DS |
3947 | spin_lock(&fs_info->balance_lock); |
3948 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3949 | spin_unlock(&fs_info->balance_lock); | |
c9e9f97b ID |
3950 | } |
3951 | ||
9ba1f6e4 | 3952 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3953 | { |
496ad9aa | 3954 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
3955 | struct btrfs_fs_info *fs_info = root->fs_info; |
3956 | struct btrfs_ioctl_balance_args *bargs; | |
3957 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 3958 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
3959 | int ret; |
3960 | ||
3961 | if (!capable(CAP_SYS_ADMIN)) | |
3962 | return -EPERM; | |
3963 | ||
e54bfa31 | 3964 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3965 | if (ret) |
3966 | return ret; | |
3967 | ||
ed0fb78f | 3968 | again: |
c3e1f96c | 3969 | if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { |
ed0fb78f ID |
3970 | mutex_lock(&fs_info->balance_mutex); |
3971 | need_unlock = true; | |
3972 | goto locked; | |
3973 | } | |
3974 | ||
3975 | /* | |
01327610 | 3976 | * mut. excl. ops lock is locked. Three possibilities: |
ed0fb78f ID |
3977 | * (1) some other op is running |
3978 | * (2) balance is running | |
3979 | * (3) balance is paused -- special case (think resume) | |
3980 | */ | |
c9e9f97b | 3981 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
3982 | if (fs_info->balance_ctl) { |
3983 | /* this is either (2) or (3) */ | |
3009a62f | 3984 | if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { |
ed0fb78f | 3985 | mutex_unlock(&fs_info->balance_mutex); |
dccdb07b DS |
3986 | /* |
3987 | * Lock released to allow other waiters to continue, | |
3988 | * we'll reexamine the status again. | |
3989 | */ | |
ed0fb78f ID |
3990 | mutex_lock(&fs_info->balance_mutex); |
3991 | ||
3992 | if (fs_info->balance_ctl && | |
3009a62f | 3993 | !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) { |
ed0fb78f ID |
3994 | /* this is (3) */ |
3995 | need_unlock = false; | |
3996 | goto locked; | |
3997 | } | |
3998 | ||
3999 | mutex_unlock(&fs_info->balance_mutex); | |
ed0fb78f ID |
4000 | goto again; |
4001 | } else { | |
4002 | /* this is (2) */ | |
4003 | mutex_unlock(&fs_info->balance_mutex); | |
4004 | ret = -EINPROGRESS; | |
4005 | goto out; | |
4006 | } | |
4007 | } else { | |
4008 | /* this is (1) */ | |
4009 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 4010 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
4011 | goto out; |
4012 | } | |
4013 | ||
4014 | locked: | |
c9e9f97b ID |
4015 | |
4016 | if (arg) { | |
4017 | bargs = memdup_user(arg, sizeof(*bargs)); | |
4018 | if (IS_ERR(bargs)) { | |
4019 | ret = PTR_ERR(bargs); | |
ed0fb78f | 4020 | goto out_unlock; |
c9e9f97b | 4021 | } |
de322263 ID |
4022 | |
4023 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
4024 | if (!fs_info->balance_ctl) { | |
4025 | ret = -ENOTCONN; | |
4026 | goto out_bargs; | |
4027 | } | |
4028 | ||
4029 | bctl = fs_info->balance_ctl; | |
4030 | spin_lock(&fs_info->balance_lock); | |
4031 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
4032 | spin_unlock(&fs_info->balance_lock); | |
4033 | ||
4034 | goto do_balance; | |
4035 | } | |
c9e9f97b ID |
4036 | } else { |
4037 | bargs = NULL; | |
4038 | } | |
4039 | ||
ed0fb78f | 4040 | if (fs_info->balance_ctl) { |
837d5b6e ID |
4041 | ret = -EINPROGRESS; |
4042 | goto out_bargs; | |
4043 | } | |
4044 | ||
8d2db785 | 4045 | bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); |
c9e9f97b ID |
4046 | if (!bctl) { |
4047 | ret = -ENOMEM; | |
4048 | goto out_bargs; | |
4049 | } | |
4050 | ||
c9e9f97b ID |
4051 | if (arg) { |
4052 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
4053 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
4054 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
4055 | ||
4056 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
4057 | } else { |
4058 | /* balance everything - no filters */ | |
4059 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
4060 | } |
4061 | ||
8eb93459 DS |
4062 | if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
4063 | ret = -EINVAL; | |
0f89abf5 | 4064 | goto out_bctl; |
8eb93459 DS |
4065 | } |
4066 | ||
de322263 | 4067 | do_balance: |
c9e9f97b | 4068 | /* |
c3e1f96c GR |
4069 | * Ownership of bctl and exclusive operation goes to btrfs_balance. |
4070 | * bctl is freed in reset_balance_state, or, if restriper was paused | |
4071 | * all the way until unmount, in free_fs_info. The flag should be | |
4072 | * cleared after reset_balance_state. | |
c9e9f97b | 4073 | */ |
ed0fb78f ID |
4074 | need_unlock = false; |
4075 | ||
6fcf6e2b | 4076 | ret = btrfs_balance(fs_info, bctl, bargs); |
0f89abf5 | 4077 | bctl = NULL; |
ed0fb78f | 4078 | |
d00c2d9c | 4079 | if ((ret == 0 || ret == -ECANCELED) && arg) { |
c9e9f97b ID |
4080 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
4081 | ret = -EFAULT; | |
4082 | } | |
4083 | ||
0f89abf5 CE |
4084 | out_bctl: |
4085 | kfree(bctl); | |
c9e9f97b ID |
4086 | out_bargs: |
4087 | kfree(bargs); | |
ed0fb78f | 4088 | out_unlock: |
c9e9f97b | 4089 | mutex_unlock(&fs_info->balance_mutex); |
ed0fb78f | 4090 | if (need_unlock) |
c3e1f96c | 4091 | btrfs_exclop_finish(fs_info); |
ed0fb78f | 4092 | out: |
e54bfa31 | 4093 | mnt_drop_write_file(file); |
c9e9f97b ID |
4094 | return ret; |
4095 | } | |
4096 | ||
2ff7e61e | 4097 | static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd) |
837d5b6e ID |
4098 | { |
4099 | if (!capable(CAP_SYS_ADMIN)) | |
4100 | return -EPERM; | |
4101 | ||
4102 | switch (cmd) { | |
4103 | case BTRFS_BALANCE_CTL_PAUSE: | |
0b246afa | 4104 | return btrfs_pause_balance(fs_info); |
a7e99c69 | 4105 | case BTRFS_BALANCE_CTL_CANCEL: |
0b246afa | 4106 | return btrfs_cancel_balance(fs_info); |
837d5b6e ID |
4107 | } |
4108 | ||
4109 | return -EINVAL; | |
4110 | } | |
4111 | ||
2ff7e61e | 4112 | static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info, |
19a39dce ID |
4113 | void __user *arg) |
4114 | { | |
19a39dce ID |
4115 | struct btrfs_ioctl_balance_args *bargs; |
4116 | int ret = 0; | |
4117 | ||
4118 | if (!capable(CAP_SYS_ADMIN)) | |
4119 | return -EPERM; | |
4120 | ||
4121 | mutex_lock(&fs_info->balance_mutex); | |
4122 | if (!fs_info->balance_ctl) { | |
4123 | ret = -ENOTCONN; | |
4124 | goto out; | |
4125 | } | |
4126 | ||
8d2db785 | 4127 | bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); |
19a39dce ID |
4128 | if (!bargs) { |
4129 | ret = -ENOMEM; | |
4130 | goto out; | |
4131 | } | |
4132 | ||
008ef096 | 4133 | btrfs_update_ioctl_balance_args(fs_info, bargs); |
19a39dce ID |
4134 | |
4135 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4136 | ret = -EFAULT; | |
4137 | ||
4138 | kfree(bargs); | |
4139 | out: | |
4140 | mutex_unlock(&fs_info->balance_mutex); | |
4141 | return ret; | |
4142 | } | |
4143 | ||
905b0dda | 4144 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4145 | { |
0b246afa JM |
4146 | struct inode *inode = file_inode(file); |
4147 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
5d13a37b | 4148 | struct btrfs_ioctl_quota_ctl_args *sa; |
5d13a37b | 4149 | int ret; |
5d13a37b AJ |
4150 | |
4151 | if (!capable(CAP_SYS_ADMIN)) | |
4152 | return -EPERM; | |
4153 | ||
905b0dda MX |
4154 | ret = mnt_want_write_file(file); |
4155 | if (ret) | |
4156 | return ret; | |
5d13a37b AJ |
4157 | |
4158 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4159 | if (IS_ERR(sa)) { |
4160 | ret = PTR_ERR(sa); | |
4161 | goto drop_write; | |
4162 | } | |
5d13a37b | 4163 | |
0b246afa | 4164 | down_write(&fs_info->subvol_sem); |
5d13a37b AJ |
4165 | |
4166 | switch (sa->cmd) { | |
4167 | case BTRFS_QUOTA_CTL_ENABLE: | |
340f1aa2 | 4168 | ret = btrfs_quota_enable(fs_info); |
5d13a37b AJ |
4169 | break; |
4170 | case BTRFS_QUOTA_CTL_DISABLE: | |
340f1aa2 | 4171 | ret = btrfs_quota_disable(fs_info); |
5d13a37b | 4172 | break; |
5d13a37b AJ |
4173 | default: |
4174 | ret = -EINVAL; | |
4175 | break; | |
4176 | } | |
4177 | ||
5d13a37b | 4178 | kfree(sa); |
0b246afa | 4179 | up_write(&fs_info->subvol_sem); |
905b0dda MX |
4180 | drop_write: |
4181 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4182 | return ret; |
4183 | } | |
4184 | ||
905b0dda | 4185 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4186 | { |
0b246afa JM |
4187 | struct inode *inode = file_inode(file); |
4188 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4189 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5d13a37b AJ |
4190 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4191 | struct btrfs_trans_handle *trans; | |
4192 | int ret; | |
4193 | int err; | |
4194 | ||
4195 | if (!capable(CAP_SYS_ADMIN)) | |
4196 | return -EPERM; | |
4197 | ||
905b0dda MX |
4198 | ret = mnt_want_write_file(file); |
4199 | if (ret) | |
4200 | return ret; | |
5d13a37b AJ |
4201 | |
4202 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4203 | if (IS_ERR(sa)) { |
4204 | ret = PTR_ERR(sa); | |
4205 | goto drop_write; | |
4206 | } | |
5d13a37b AJ |
4207 | |
4208 | trans = btrfs_join_transaction(root); | |
4209 | if (IS_ERR(trans)) { | |
4210 | ret = PTR_ERR(trans); | |
4211 | goto out; | |
4212 | } | |
4213 | ||
5d13a37b | 4214 | if (sa->assign) { |
9f8a6ce6 | 4215 | ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst); |
5d13a37b | 4216 | } else { |
39616c27 | 4217 | ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst); |
5d13a37b AJ |
4218 | } |
4219 | ||
e082f563 | 4220 | /* update qgroup status and info */ |
280f8bd2 | 4221 | err = btrfs_run_qgroups(trans); |
e082f563 | 4222 | if (err < 0) |
0b246afa JM |
4223 | btrfs_handle_fs_error(fs_info, err, |
4224 | "failed to update qgroup status and info"); | |
3a45bb20 | 4225 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
4226 | if (err && !ret) |
4227 | ret = err; | |
4228 | ||
4229 | out: | |
4230 | kfree(sa); | |
905b0dda MX |
4231 | drop_write: |
4232 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4233 | return ret; |
4234 | } | |
4235 | ||
905b0dda | 4236 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4237 | { |
0b246afa | 4238 | struct inode *inode = file_inode(file); |
0b246afa | 4239 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
4240 | struct btrfs_ioctl_qgroup_create_args *sa; |
4241 | struct btrfs_trans_handle *trans; | |
4242 | int ret; | |
4243 | int err; | |
4244 | ||
4245 | if (!capable(CAP_SYS_ADMIN)) | |
4246 | return -EPERM; | |
4247 | ||
905b0dda MX |
4248 | ret = mnt_want_write_file(file); |
4249 | if (ret) | |
4250 | return ret; | |
5d13a37b AJ |
4251 | |
4252 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4253 | if (IS_ERR(sa)) { |
4254 | ret = PTR_ERR(sa); | |
4255 | goto drop_write; | |
4256 | } | |
5d13a37b | 4257 | |
d86e56cf MX |
4258 | if (!sa->qgroupid) { |
4259 | ret = -EINVAL; | |
4260 | goto out; | |
4261 | } | |
4262 | ||
5d13a37b AJ |
4263 | trans = btrfs_join_transaction(root); |
4264 | if (IS_ERR(trans)) { | |
4265 | ret = PTR_ERR(trans); | |
4266 | goto out; | |
4267 | } | |
4268 | ||
5d13a37b | 4269 | if (sa->create) { |
49a05ecd | 4270 | ret = btrfs_create_qgroup(trans, sa->qgroupid); |
5d13a37b | 4271 | } else { |
3efbee1d | 4272 | ret = btrfs_remove_qgroup(trans, sa->qgroupid); |
5d13a37b AJ |
4273 | } |
4274 | ||
3a45bb20 | 4275 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
4276 | if (err && !ret) |
4277 | ret = err; | |
4278 | ||
4279 | out: | |
4280 | kfree(sa); | |
905b0dda MX |
4281 | drop_write: |
4282 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4283 | return ret; |
4284 | } | |
4285 | ||
905b0dda | 4286 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4287 | { |
0b246afa | 4288 | struct inode *inode = file_inode(file); |
0b246afa | 4289 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5d13a37b AJ |
4290 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4291 | struct btrfs_trans_handle *trans; | |
4292 | int ret; | |
4293 | int err; | |
4294 | u64 qgroupid; | |
4295 | ||
4296 | if (!capable(CAP_SYS_ADMIN)) | |
4297 | return -EPERM; | |
4298 | ||
905b0dda MX |
4299 | ret = mnt_want_write_file(file); |
4300 | if (ret) | |
4301 | return ret; | |
5d13a37b AJ |
4302 | |
4303 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4304 | if (IS_ERR(sa)) { |
4305 | ret = PTR_ERR(sa); | |
4306 | goto drop_write; | |
4307 | } | |
5d13a37b AJ |
4308 | |
4309 | trans = btrfs_join_transaction(root); | |
4310 | if (IS_ERR(trans)) { | |
4311 | ret = PTR_ERR(trans); | |
4312 | goto out; | |
4313 | } | |
4314 | ||
4315 | qgroupid = sa->qgroupid; | |
4316 | if (!qgroupid) { | |
4317 | /* take the current subvol as qgroup */ | |
4318 | qgroupid = root->root_key.objectid; | |
4319 | } | |
4320 | ||
f0042d5e | 4321 | ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim); |
5d13a37b | 4322 | |
3a45bb20 | 4323 | err = btrfs_end_transaction(trans); |
5d13a37b AJ |
4324 | if (err && !ret) |
4325 | ret = err; | |
4326 | ||
4327 | out: | |
4328 | kfree(sa); | |
905b0dda MX |
4329 | drop_write: |
4330 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4331 | return ret; |
4332 | } | |
4333 | ||
2f232036 JS |
4334 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
4335 | { | |
0b246afa JM |
4336 | struct inode *inode = file_inode(file); |
4337 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
2f232036 JS |
4338 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4339 | int ret; | |
4340 | ||
4341 | if (!capable(CAP_SYS_ADMIN)) | |
4342 | return -EPERM; | |
4343 | ||
4344 | ret = mnt_want_write_file(file); | |
4345 | if (ret) | |
4346 | return ret; | |
4347 | ||
4348 | qsa = memdup_user(arg, sizeof(*qsa)); | |
4349 | if (IS_ERR(qsa)) { | |
4350 | ret = PTR_ERR(qsa); | |
4351 | goto drop_write; | |
4352 | } | |
4353 | ||
4354 | if (qsa->flags) { | |
4355 | ret = -EINVAL; | |
4356 | goto out; | |
4357 | } | |
4358 | ||
0b246afa | 4359 | ret = btrfs_qgroup_rescan(fs_info); |
2f232036 JS |
4360 | |
4361 | out: | |
4362 | kfree(qsa); | |
4363 | drop_write: | |
4364 | mnt_drop_write_file(file); | |
4365 | return ret; | |
4366 | } | |
4367 | ||
b929c1d8 MPS |
4368 | static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info, |
4369 | void __user *arg) | |
2f232036 | 4370 | { |
0afb603a | 4371 | struct btrfs_ioctl_quota_rescan_args qsa = {0}; |
2f232036 JS |
4372 | |
4373 | if (!capable(CAP_SYS_ADMIN)) | |
4374 | return -EPERM; | |
4375 | ||
0b246afa | 4376 | if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { |
0afb603a GR |
4377 | qsa.flags = 1; |
4378 | qsa.progress = fs_info->qgroup_rescan_progress.objectid; | |
2f232036 JS |
4379 | } |
4380 | ||
0afb603a | 4381 | if (copy_to_user(arg, &qsa, sizeof(qsa))) |
991a3dae | 4382 | return -EFAULT; |
2f232036 | 4383 | |
991a3dae | 4384 | return 0; |
2f232036 JS |
4385 | } |
4386 | ||
b929c1d8 MPS |
4387 | static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info, |
4388 | void __user *arg) | |
57254b6e | 4389 | { |
57254b6e JS |
4390 | if (!capable(CAP_SYS_ADMIN)) |
4391 | return -EPERM; | |
4392 | ||
0b246afa | 4393 | return btrfs_qgroup_wait_for_completion(fs_info, true); |
57254b6e JS |
4394 | } |
4395 | ||
abccd00f | 4396 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
e4fed17a | 4397 | struct user_namespace *mnt_userns, |
abccd00f | 4398 | struct btrfs_ioctl_received_subvol_args *sa) |
8ea05e3a | 4399 | { |
496ad9aa | 4400 | struct inode *inode = file_inode(file); |
0b246afa | 4401 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); |
8ea05e3a AB |
4402 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4403 | struct btrfs_root_item *root_item = &root->root_item; | |
4404 | struct btrfs_trans_handle *trans; | |
95582b00 | 4405 | struct timespec64 ct = current_time(inode); |
8ea05e3a | 4406 | int ret = 0; |
dd5f9615 | 4407 | int received_uuid_changed; |
8ea05e3a | 4408 | |
e4fed17a | 4409 | if (!inode_owner_or_capable(mnt_userns, inode)) |
bd60ea0f DS |
4410 | return -EPERM; |
4411 | ||
8ea05e3a AB |
4412 | ret = mnt_want_write_file(file); |
4413 | if (ret < 0) | |
4414 | return ret; | |
4415 | ||
0b246afa | 4416 | down_write(&fs_info->subvol_sem); |
8ea05e3a | 4417 | |
4a0cc7ca | 4418 | if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) { |
8ea05e3a AB |
4419 | ret = -EINVAL; |
4420 | goto out; | |
4421 | } | |
4422 | ||
4423 | if (btrfs_root_readonly(root)) { | |
4424 | ret = -EROFS; | |
4425 | goto out; | |
4426 | } | |
4427 | ||
dd5f9615 SB |
4428 | /* |
4429 | * 1 - root item | |
4430 | * 2 - uuid items (received uuid + subvol uuid) | |
4431 | */ | |
4432 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
4433 | if (IS_ERR(trans)) { |
4434 | ret = PTR_ERR(trans); | |
4435 | trans = NULL; | |
4436 | goto out; | |
4437 | } | |
4438 | ||
4439 | sa->rtransid = trans->transid; | |
4440 | sa->rtime.sec = ct.tv_sec; | |
4441 | sa->rtime.nsec = ct.tv_nsec; | |
4442 | ||
dd5f9615 SB |
4443 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
4444 | BTRFS_UUID_SIZE); | |
4445 | if (received_uuid_changed && | |
d87ff758 | 4446 | !btrfs_is_empty_uuid(root_item->received_uuid)) { |
d1957791 | 4447 | ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid, |
d87ff758 NB |
4448 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
4449 | root->root_key.objectid); | |
4450 | if (ret && ret != -ENOENT) { | |
4451 | btrfs_abort_transaction(trans, ret); | |
4452 | btrfs_end_transaction(trans); | |
4453 | goto out; | |
4454 | } | |
4455 | } | |
8ea05e3a AB |
4456 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
4457 | btrfs_set_root_stransid(root_item, sa->stransid); | |
4458 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
4459 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
4460 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
4461 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
4462 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a | 4463 | |
0b246afa | 4464 | ret = btrfs_update_root(trans, fs_info->tree_root, |
8ea05e3a AB |
4465 | &root->root_key, &root->root_item); |
4466 | if (ret < 0) { | |
3a45bb20 | 4467 | btrfs_end_transaction(trans); |
8ea05e3a | 4468 | goto out; |
dd5f9615 SB |
4469 | } |
4470 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
cdb345a8 | 4471 | ret = btrfs_uuid_tree_add(trans, sa->uuid, |
dd5f9615 SB |
4472 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
4473 | root->root_key.objectid); | |
4474 | if (ret < 0 && ret != -EEXIST) { | |
66642832 | 4475 | btrfs_abort_transaction(trans, ret); |
efd38150 | 4476 | btrfs_end_transaction(trans); |
8ea05e3a | 4477 | goto out; |
dd5f9615 SB |
4478 | } |
4479 | } | |
3a45bb20 | 4480 | ret = btrfs_commit_transaction(trans); |
abccd00f | 4481 | out: |
0b246afa | 4482 | up_write(&fs_info->subvol_sem); |
abccd00f HM |
4483 | mnt_drop_write_file(file); |
4484 | return ret; | |
4485 | } | |
4486 | ||
4487 | #ifdef CONFIG_64BIT | |
4488 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
4489 | void __user *arg) | |
4490 | { | |
4491 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
4492 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
4493 | int ret = 0; | |
4494 | ||
4495 | args32 = memdup_user(arg, sizeof(*args32)); | |
7b9ea627 SV |
4496 | if (IS_ERR(args32)) |
4497 | return PTR_ERR(args32); | |
abccd00f | 4498 | |
8d2db785 | 4499 | args64 = kmalloc(sizeof(*args64), GFP_KERNEL); |
84dbeb87 DC |
4500 | if (!args64) { |
4501 | ret = -ENOMEM; | |
abccd00f HM |
4502 | goto out; |
4503 | } | |
4504 | ||
4505 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
4506 | args64->stransid = args32->stransid; | |
4507 | args64->rtransid = args32->rtransid; | |
4508 | args64->stime.sec = args32->stime.sec; | |
4509 | args64->stime.nsec = args32->stime.nsec; | |
4510 | args64->rtime.sec = args32->rtime.sec; | |
4511 | args64->rtime.nsec = args32->rtime.nsec; | |
4512 | args64->flags = args32->flags; | |
4513 | ||
e4fed17a | 4514 | ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64); |
abccd00f HM |
4515 | if (ret) |
4516 | goto out; | |
4517 | ||
4518 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
4519 | args32->stransid = args64->stransid; | |
4520 | args32->rtransid = args64->rtransid; | |
4521 | args32->stime.sec = args64->stime.sec; | |
4522 | args32->stime.nsec = args64->stime.nsec; | |
4523 | args32->rtime.sec = args64->rtime.sec; | |
4524 | args32->rtime.nsec = args64->rtime.nsec; | |
4525 | args32->flags = args64->flags; | |
4526 | ||
4527 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
4528 | if (ret) | |
4529 | ret = -EFAULT; | |
4530 | ||
4531 | out: | |
4532 | kfree(args32); | |
4533 | kfree(args64); | |
4534 | return ret; | |
4535 | } | |
4536 | #endif | |
4537 | ||
4538 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
4539 | void __user *arg) | |
4540 | { | |
4541 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
4542 | int ret = 0; | |
4543 | ||
4544 | sa = memdup_user(arg, sizeof(*sa)); | |
7b9ea627 SV |
4545 | if (IS_ERR(sa)) |
4546 | return PTR_ERR(sa); | |
abccd00f | 4547 | |
e4fed17a | 4548 | ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa); |
abccd00f HM |
4549 | |
4550 | if (ret) | |
4551 | goto out; | |
4552 | ||
8ea05e3a AB |
4553 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
4554 | if (ret) | |
4555 | ret = -EFAULT; | |
4556 | ||
4557 | out: | |
4558 | kfree(sa); | |
8ea05e3a AB |
4559 | return ret; |
4560 | } | |
4561 | ||
b929c1d8 MPS |
4562 | static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info, |
4563 | void __user *arg) | |
867ab667 | 4564 | { |
a1b83ac5 | 4565 | size_t len; |
867ab667 | 4566 | int ret; |
a1b83ac5 AJ |
4567 | char label[BTRFS_LABEL_SIZE]; |
4568 | ||
0b246afa JM |
4569 | spin_lock(&fs_info->super_lock); |
4570 | memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
4571 | spin_unlock(&fs_info->super_lock); | |
a1b83ac5 AJ |
4572 | |
4573 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 4574 | |
4575 | if (len == BTRFS_LABEL_SIZE) { | |
0b246afa JM |
4576 | btrfs_warn(fs_info, |
4577 | "label is too long, return the first %zu bytes", | |
4578 | --len); | |
867ab667 | 4579 | } |
4580 | ||
867ab667 | 4581 | ret = copy_to_user(arg, label, len); |
867ab667 | 4582 | |
4583 | return ret ? -EFAULT : 0; | |
4584 | } | |
4585 | ||
a8bfd4ab | 4586 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
4587 | { | |
0b246afa JM |
4588 | struct inode *inode = file_inode(file); |
4589 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4590 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4591 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
a8bfd4ab | 4592 | struct btrfs_trans_handle *trans; |
4593 | char label[BTRFS_LABEL_SIZE]; | |
4594 | int ret; | |
4595 | ||
4596 | if (!capable(CAP_SYS_ADMIN)) | |
4597 | return -EPERM; | |
4598 | ||
4599 | if (copy_from_user(label, arg, sizeof(label))) | |
4600 | return -EFAULT; | |
4601 | ||
4602 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
0b246afa | 4603 | btrfs_err(fs_info, |
5d163e0e JM |
4604 | "unable to set label with more than %d bytes", |
4605 | BTRFS_LABEL_SIZE - 1); | |
a8bfd4ab | 4606 | return -EINVAL; |
4607 | } | |
4608 | ||
4609 | ret = mnt_want_write_file(file); | |
4610 | if (ret) | |
4611 | return ret; | |
4612 | ||
a8bfd4ab | 4613 | trans = btrfs_start_transaction(root, 0); |
4614 | if (IS_ERR(trans)) { | |
4615 | ret = PTR_ERR(trans); | |
4616 | goto out_unlock; | |
4617 | } | |
4618 | ||
0b246afa | 4619 | spin_lock(&fs_info->super_lock); |
a8bfd4ab | 4620 | strcpy(super_block->label, label); |
0b246afa | 4621 | spin_unlock(&fs_info->super_lock); |
3a45bb20 | 4622 | ret = btrfs_commit_transaction(trans); |
a8bfd4ab | 4623 | |
4624 | out_unlock: | |
a8bfd4ab | 4625 | mnt_drop_write_file(file); |
4626 | return ret; | |
4627 | } | |
4628 | ||
2eaa055f JM |
4629 | #define INIT_FEATURE_FLAGS(suffix) \ |
4630 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
4631 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
4632 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
4633 | ||
d5131b65 | 4634 | int btrfs_ioctl_get_supported_features(void __user *arg) |
2eaa055f | 4635 | { |
4d4ab6d6 | 4636 | static const struct btrfs_ioctl_feature_flags features[3] = { |
2eaa055f JM |
4637 | INIT_FEATURE_FLAGS(SUPP), |
4638 | INIT_FEATURE_FLAGS(SAFE_SET), | |
4639 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
4640 | }; | |
4641 | ||
4642 | if (copy_to_user(arg, &features, sizeof(features))) | |
4643 | return -EFAULT; | |
4644 | ||
4645 | return 0; | |
4646 | } | |
4647 | ||
b929c1d8 MPS |
4648 | static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info, |
4649 | void __user *arg) | |
2eaa055f | 4650 | { |
0b246afa | 4651 | struct btrfs_super_block *super_block = fs_info->super_copy; |
2eaa055f JM |
4652 | struct btrfs_ioctl_feature_flags features; |
4653 | ||
4654 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
4655 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
4656 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
4657 | ||
4658 | if (copy_to_user(arg, &features, sizeof(features))) | |
4659 | return -EFAULT; | |
4660 | ||
4661 | return 0; | |
4662 | } | |
4663 | ||
2ff7e61e | 4664 | static int check_feature_bits(struct btrfs_fs_info *fs_info, |
3b02a68a | 4665 | enum btrfs_feature_set set, |
2eaa055f JM |
4666 | u64 change_mask, u64 flags, u64 supported_flags, |
4667 | u64 safe_set, u64 safe_clear) | |
4668 | { | |
f10152bc | 4669 | const char *type = btrfs_feature_set_name(set); |
3b02a68a | 4670 | char *names; |
2eaa055f JM |
4671 | u64 disallowed, unsupported; |
4672 | u64 set_mask = flags & change_mask; | |
4673 | u64 clear_mask = ~flags & change_mask; | |
4674 | ||
4675 | unsupported = set_mask & ~supported_flags; | |
4676 | if (unsupported) { | |
3b02a68a JM |
4677 | names = btrfs_printable_features(set, unsupported); |
4678 | if (names) { | |
0b246afa JM |
4679 | btrfs_warn(fs_info, |
4680 | "this kernel does not support the %s feature bit%s", | |
4681 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4682 | kfree(names); |
4683 | } else | |
0b246afa JM |
4684 | btrfs_warn(fs_info, |
4685 | "this kernel does not support %s bits 0x%llx", | |
4686 | type, unsupported); | |
2eaa055f JM |
4687 | return -EOPNOTSUPP; |
4688 | } | |
4689 | ||
4690 | disallowed = set_mask & ~safe_set; | |
4691 | if (disallowed) { | |
3b02a68a JM |
4692 | names = btrfs_printable_features(set, disallowed); |
4693 | if (names) { | |
0b246afa JM |
4694 | btrfs_warn(fs_info, |
4695 | "can't set the %s feature bit%s while mounted", | |
4696 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4697 | kfree(names); |
4698 | } else | |
0b246afa JM |
4699 | btrfs_warn(fs_info, |
4700 | "can't set %s bits 0x%llx while mounted", | |
4701 | type, disallowed); | |
2eaa055f JM |
4702 | return -EPERM; |
4703 | } | |
4704 | ||
4705 | disallowed = clear_mask & ~safe_clear; | |
4706 | if (disallowed) { | |
3b02a68a JM |
4707 | names = btrfs_printable_features(set, disallowed); |
4708 | if (names) { | |
0b246afa JM |
4709 | btrfs_warn(fs_info, |
4710 | "can't clear the %s feature bit%s while mounted", | |
4711 | names, strchr(names, ',') ? "s" : ""); | |
3b02a68a JM |
4712 | kfree(names); |
4713 | } else | |
0b246afa JM |
4714 | btrfs_warn(fs_info, |
4715 | "can't clear %s bits 0x%llx while mounted", | |
4716 | type, disallowed); | |
2eaa055f JM |
4717 | return -EPERM; |
4718 | } | |
4719 | ||
4720 | return 0; | |
4721 | } | |
4722 | ||
2ff7e61e JM |
4723 | #define check_feature(fs_info, change_mask, flags, mask_base) \ |
4724 | check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \ | |
2eaa055f JM |
4725 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
4726 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
4727 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
4728 | ||
4729 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
4730 | { | |
0b246afa JM |
4731 | struct inode *inode = file_inode(file); |
4732 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4733 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4734 | struct btrfs_super_block *super_block = fs_info->super_copy; | |
2eaa055f JM |
4735 | struct btrfs_ioctl_feature_flags flags[2]; |
4736 | struct btrfs_trans_handle *trans; | |
4737 | u64 newflags; | |
4738 | int ret; | |
4739 | ||
4740 | if (!capable(CAP_SYS_ADMIN)) | |
4741 | return -EPERM; | |
4742 | ||
4743 | if (copy_from_user(flags, arg, sizeof(flags))) | |
4744 | return -EFAULT; | |
4745 | ||
4746 | /* Nothing to do */ | |
4747 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
4748 | !flags[0].incompat_flags) | |
4749 | return 0; | |
4750 | ||
2ff7e61e | 4751 | ret = check_feature(fs_info, flags[0].compat_flags, |
2eaa055f JM |
4752 | flags[1].compat_flags, COMPAT); |
4753 | if (ret) | |
4754 | return ret; | |
4755 | ||
2ff7e61e | 4756 | ret = check_feature(fs_info, flags[0].compat_ro_flags, |
2eaa055f JM |
4757 | flags[1].compat_ro_flags, COMPAT_RO); |
4758 | if (ret) | |
4759 | return ret; | |
4760 | ||
2ff7e61e | 4761 | ret = check_feature(fs_info, flags[0].incompat_flags, |
2eaa055f JM |
4762 | flags[1].incompat_flags, INCOMPAT); |
4763 | if (ret) | |
4764 | return ret; | |
4765 | ||
7ab19625 DS |
4766 | ret = mnt_want_write_file(file); |
4767 | if (ret) | |
4768 | return ret; | |
4769 | ||
8051aa1a | 4770 | trans = btrfs_start_transaction(root, 0); |
7ab19625 DS |
4771 | if (IS_ERR(trans)) { |
4772 | ret = PTR_ERR(trans); | |
4773 | goto out_drop_write; | |
4774 | } | |
2eaa055f | 4775 | |
0b246afa | 4776 | spin_lock(&fs_info->super_lock); |
2eaa055f JM |
4777 | newflags = btrfs_super_compat_flags(super_block); |
4778 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
4779 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
4780 | btrfs_set_super_compat_flags(super_block, newflags); | |
4781 | ||
4782 | newflags = btrfs_super_compat_ro_flags(super_block); | |
4783 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
4784 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
4785 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
4786 | ||
4787 | newflags = btrfs_super_incompat_flags(super_block); | |
4788 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
4789 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
4790 | btrfs_set_super_incompat_flags(super_block, newflags); | |
0b246afa | 4791 | spin_unlock(&fs_info->super_lock); |
2eaa055f | 4792 | |
3a45bb20 | 4793 | ret = btrfs_commit_transaction(trans); |
7ab19625 DS |
4794 | out_drop_write: |
4795 | mnt_drop_write_file(file); | |
4796 | ||
4797 | return ret; | |
2eaa055f JM |
4798 | } |
4799 | ||
2351f431 JB |
4800 | static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) |
4801 | { | |
4802 | struct btrfs_ioctl_send_args *arg; | |
4803 | int ret; | |
4804 | ||
4805 | if (compat) { | |
4806 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4807 | struct btrfs_ioctl_send_args_32 args32; | |
4808 | ||
4809 | ret = copy_from_user(&args32, argp, sizeof(args32)); | |
4810 | if (ret) | |
4811 | return -EFAULT; | |
4812 | arg = kzalloc(sizeof(*arg), GFP_KERNEL); | |
4813 | if (!arg) | |
4814 | return -ENOMEM; | |
4815 | arg->send_fd = args32.send_fd; | |
4816 | arg->clone_sources_count = args32.clone_sources_count; | |
4817 | arg->clone_sources = compat_ptr(args32.clone_sources); | |
4818 | arg->parent_root = args32.parent_root; | |
4819 | arg->flags = args32.flags; | |
4820 | memcpy(arg->reserved, args32.reserved, | |
4821 | sizeof(args32.reserved)); | |
4822 | #else | |
4823 | return -ENOTTY; | |
4824 | #endif | |
4825 | } else { | |
4826 | arg = memdup_user(argp, sizeof(*arg)); | |
4827 | if (IS_ERR(arg)) | |
4828 | return PTR_ERR(arg); | |
4829 | } | |
4830 | ret = btrfs_ioctl_send(file, arg); | |
4831 | kfree(arg); | |
4832 | return ret; | |
4833 | } | |
4834 | ||
f46b5a66 CH |
4835 | long btrfs_ioctl(struct file *file, unsigned int |
4836 | cmd, unsigned long arg) | |
4837 | { | |
0b246afa JM |
4838 | struct inode *inode = file_inode(file); |
4839 | struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); | |
4840 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4bcabaa3 | 4841 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
4842 | |
4843 | switch (cmd) { | |
6cbff00f CH |
4844 | case FS_IOC_GETVERSION: |
4845 | return btrfs_ioctl_getversion(file, argp); | |
40cf931f | 4846 | case FS_IOC_GETFSLABEL: |
b929c1d8 | 4847 | return btrfs_ioctl_get_fslabel(fs_info, argp); |
40cf931f ES |
4848 | case FS_IOC_SETFSLABEL: |
4849 | return btrfs_ioctl_set_fslabel(file, argp); | |
f7039b1d | 4850 | case FITRIM: |
b929c1d8 | 4851 | return btrfs_ioctl_fitrim(fs_info, argp); |
f46b5a66 | 4852 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 4853 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 4854 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 4855 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 4856 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 4857 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
4858 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
4859 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c | 4860 | case BTRFS_IOC_SNAP_DESTROY: |
949964c9 MPS |
4861 | return btrfs_ioctl_snap_destroy(file, argp, false); |
4862 | case BTRFS_IOC_SNAP_DESTROY_V2: | |
4863 | return btrfs_ioctl_snap_destroy(file, argp, true); | |
0caa102d LZ |
4864 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
4865 | return btrfs_ioctl_subvol_getflags(file, argp); | |
4866 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
4867 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
4868 | case BTRFS_IOC_DEFAULT_SUBVOL: |
4869 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 4870 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
4871 | return btrfs_ioctl_defrag(file, NULL); |
4872 | case BTRFS_IOC_DEFRAG_RANGE: | |
4873 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 4874 | case BTRFS_IOC_RESIZE: |
198605a8 | 4875 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 4876 | case BTRFS_IOC_ADD_DEV: |
2ff7e61e | 4877 | return btrfs_ioctl_add_dev(fs_info, argp); |
f46b5a66 | 4878 | case BTRFS_IOC_RM_DEV: |
da24927b | 4879 | return btrfs_ioctl_rm_dev(file, argp); |
6b526ed7 AJ |
4880 | case BTRFS_IOC_RM_DEV_V2: |
4881 | return btrfs_ioctl_rm_dev_v2(file, argp); | |
475f6387 | 4882 | case BTRFS_IOC_FS_INFO: |
2ff7e61e | 4883 | return btrfs_ioctl_fs_info(fs_info, argp); |
475f6387 | 4884 | case BTRFS_IOC_DEV_INFO: |
2ff7e61e | 4885 | return btrfs_ioctl_dev_info(fs_info, argp); |
f46b5a66 | 4886 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 4887 | return btrfs_ioctl_balance(file, NULL); |
ac8e9819 CM |
4888 | case BTRFS_IOC_TREE_SEARCH: |
4889 | return btrfs_ioctl_tree_search(file, argp); | |
cc68a8a5 GH |
4890 | case BTRFS_IOC_TREE_SEARCH_V2: |
4891 | return btrfs_ioctl_tree_search_v2(file, argp); | |
ac8e9819 CM |
4892 | case BTRFS_IOC_INO_LOOKUP: |
4893 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
4894 | case BTRFS_IOC_INO_PATHS: |
4895 | return btrfs_ioctl_ino_to_path(root, argp); | |
4896 | case BTRFS_IOC_LOGICAL_INO: | |
d24a67b2 ZB |
4897 | return btrfs_ioctl_logical_to_ino(fs_info, argp, 1); |
4898 | case BTRFS_IOC_LOGICAL_INO_V2: | |
4899 | return btrfs_ioctl_logical_to_ino(fs_info, argp, 2); | |
1406e432 | 4900 | case BTRFS_IOC_SPACE_INFO: |
2ff7e61e | 4901 | return btrfs_ioctl_space_info(fs_info, argp); |
9b199859 FDBM |
4902 | case BTRFS_IOC_SYNC: { |
4903 | int ret; | |
4904 | ||
9db4dc24 | 4905 | ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); |
9b199859 FDBM |
4906 | if (ret) |
4907 | return ret; | |
0b246afa | 4908 | ret = btrfs_sync_fs(inode->i_sb, 1); |
2fad4e83 DS |
4909 | /* |
4910 | * The transaction thread may want to do more work, | |
01327610 | 4911 | * namely it pokes the cleaner kthread that will start |
2fad4e83 DS |
4912 | * processing uncleaned subvols. |
4913 | */ | |
0b246afa | 4914 | wake_up_process(fs_info->transaction_kthread); |
9b199859 FDBM |
4915 | return ret; |
4916 | } | |
46204592 | 4917 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 4918 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 4919 | case BTRFS_IOC_WAIT_SYNC: |
2ff7e61e | 4920 | return btrfs_ioctl_wait_sync(fs_info, argp); |
475f6387 | 4921 | case BTRFS_IOC_SCRUB: |
b8e95489 | 4922 | return btrfs_ioctl_scrub(file, argp); |
475f6387 | 4923 | case BTRFS_IOC_SCRUB_CANCEL: |
2ff7e61e | 4924 | return btrfs_ioctl_scrub_cancel(fs_info); |
475f6387 | 4925 | case BTRFS_IOC_SCRUB_PROGRESS: |
2ff7e61e | 4926 | return btrfs_ioctl_scrub_progress(fs_info, argp); |
c9e9f97b | 4927 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 4928 | return btrfs_ioctl_balance(file, argp); |
837d5b6e | 4929 | case BTRFS_IOC_BALANCE_CTL: |
2ff7e61e | 4930 | return btrfs_ioctl_balance_ctl(fs_info, arg); |
19a39dce | 4931 | case BTRFS_IOC_BALANCE_PROGRESS: |
2ff7e61e | 4932 | return btrfs_ioctl_balance_progress(fs_info, argp); |
8ea05e3a AB |
4933 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
4934 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
4935 | #ifdef CONFIG_64BIT |
4936 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
4937 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
4938 | #endif | |
31db9f7c | 4939 | case BTRFS_IOC_SEND: |
2351f431 JB |
4940 | return _btrfs_ioctl_send(file, argp, false); |
4941 | #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) | |
4942 | case BTRFS_IOC_SEND_32: | |
4943 | return _btrfs_ioctl_send(file, argp, true); | |
4944 | #endif | |
c11d2c23 | 4945 | case BTRFS_IOC_GET_DEV_STATS: |
2ff7e61e | 4946 | return btrfs_ioctl_get_dev_stats(fs_info, argp); |
5d13a37b | 4947 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 4948 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 4949 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 4950 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 4951 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 4952 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 4953 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 4954 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
4955 | case BTRFS_IOC_QUOTA_RESCAN: |
4956 | return btrfs_ioctl_quota_rescan(file, argp); | |
4957 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
b929c1d8 | 4958 | return btrfs_ioctl_quota_rescan_status(fs_info, argp); |
57254b6e | 4959 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
b929c1d8 | 4960 | return btrfs_ioctl_quota_rescan_wait(fs_info, argp); |
3f6bcfbd | 4961 | case BTRFS_IOC_DEV_REPLACE: |
2ff7e61e | 4962 | return btrfs_ioctl_dev_replace(fs_info, argp); |
2eaa055f | 4963 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 4964 | return btrfs_ioctl_get_supported_features(argp); |
2eaa055f | 4965 | case BTRFS_IOC_GET_FEATURES: |
b929c1d8 | 4966 | return btrfs_ioctl_get_features(fs_info, argp); |
2eaa055f JM |
4967 | case BTRFS_IOC_SET_FEATURES: |
4968 | return btrfs_ioctl_set_features(file, argp); | |
b64ec075 TM |
4969 | case BTRFS_IOC_GET_SUBVOL_INFO: |
4970 | return btrfs_ioctl_get_subvol_info(file, argp); | |
42e4b520 TM |
4971 | case BTRFS_IOC_GET_SUBVOL_ROOTREF: |
4972 | return btrfs_ioctl_get_subvol_rootref(file, argp); | |
23d0b79d TM |
4973 | case BTRFS_IOC_INO_LOOKUP_USER: |
4974 | return btrfs_ioctl_ino_lookup_user(file, argp); | |
14605409 BB |
4975 | case FS_IOC_ENABLE_VERITY: |
4976 | return fsverity_ioctl_enable(file, (const void __user *)argp); | |
4977 | case FS_IOC_MEASURE_VERITY: | |
4978 | return fsverity_ioctl_measure(file, argp); | |
f46b5a66 CH |
4979 | } |
4980 | ||
4981 | return -ENOTTY; | |
4982 | } | |
4c63c245 LD |
4983 | |
4984 | #ifdef CONFIG_COMPAT | |
4985 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
4986 | { | |
2a362249 JM |
4987 | /* |
4988 | * These all access 32-bit values anyway so no further | |
4989 | * handling is necessary. | |
4990 | */ | |
4c63c245 | 4991 | switch (cmd) { |
4c63c245 LD |
4992 | case FS_IOC32_GETVERSION: |
4993 | cmd = FS_IOC_GETVERSION; | |
4994 | break; | |
4c63c245 LD |
4995 | } |
4996 | ||
4997 | return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); | |
4998 | } | |
4999 | #endif |