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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 CM |
4 | */ |
5 | ||
4b82d6e4 | 6 | #include <linux/blkdev.h> |
2e635a27 CM |
7 | #include <linux/module.h> |
8 | #include <linux/fs.h> | |
9 | #include <linux/pagemap.h> | |
10 | #include <linux/highmem.h> | |
11 | #include <linux/time.h> | |
12 | #include <linux/init.h> | |
a9572a15 | 13 | #include <linux/seq_file.h> |
2e635a27 | 14 | #include <linux/string.h> |
2e635a27 | 15 | #include <linux/backing-dev.h> |
4b82d6e4 | 16 | #include <linux/mount.h> |
75dfe396 | 17 | #include <linux/writeback.h> |
8fd17795 | 18 | #include <linux/statfs.h> |
08607c1b | 19 | #include <linux/compat.h> |
95e05289 | 20 | #include <linux/parser.h> |
c59f8951 | 21 | #include <linux/ctype.h> |
6da6abae | 22 | #include <linux/namei.h> |
a9218f6b | 23 | #include <linux/miscdevice.h> |
1bcbf313 | 24 | #include <linux/magic.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
22c44fe6 | 26 | #include <linux/ratelimit.h> |
9678c543 | 27 | #include <linux/crc32c.h> |
55e301fd | 28 | #include <linux/btrfs.h> |
c60a2880 | 29 | #include <linux/security.h> |
15ddcdd3 | 30 | #include <linux/fs_parser.h> |
ae1e766f | 31 | #include <linux/swap.h> |
9b569ea0 | 32 | #include "messages.h" |
16cdcec7 | 33 | #include "delayed-inode.h" |
2e635a27 | 34 | #include "ctree.h" |
e20d96d6 | 35 | #include "disk-io.h" |
d5719762 | 36 | #include "transaction.h" |
2c90e5d6 | 37 | #include "btrfs_inode.h" |
9aa29a20 | 38 | #include "direct-io.h" |
63541927 | 39 | #include "props.h" |
5103e947 | 40 | #include "xattr.h" |
103c1972 | 41 | #include "bio.h" |
be6e8dc0 | 42 | #include "export.h" |
c8b97818 | 43 | #include "compression.h" |
8dabb742 | 44 | #include "dev-replace.h" |
74255aa0 | 45 | #include "free-space-cache.h" |
b9e9a6cb | 46 | #include "backref.h" |
8719aaae | 47 | #include "space-info.h" |
89439109 | 48 | #include "sysfs.h" |
b70f5097 | 49 | #include "zoned.h" |
dc11dd5d | 50 | #include "tests/btrfs-tests.h" |
aac0023c | 51 | #include "block-group.h" |
b0643e59 | 52 | #include "discard.h" |
d3982100 | 53 | #include "qgroup.h" |
b8bea09a | 54 | #include "raid56.h" |
c7f13d42 | 55 | #include "fs.h" |
07e81dc9 | 56 | #include "accessors.h" |
59b818e0 | 57 | #include "defrag.h" |
f2b39277 | 58 | #include "dir-item.h" |
7572dec8 | 59 | #include "ioctl.h" |
2fc6822c | 60 | #include "scrub.h" |
5c11adcc | 61 | #include "verity.h" |
c03b2207 | 62 | #include "super.h" |
cfc2de0f | 63 | #include "extent-tree.h" |
1abe9b8a | 64 | #define CREATE_TRACE_POINTS |
65 | #include <trace/events/btrfs.h> | |
66 | ||
b87221de | 67 | static const struct super_operations btrfs_super_ops; |
830c4adb | 68 | static struct file_system_type btrfs_fs_type; |
0723a047 | 69 | |
d397712b | 70 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 71 | { |
2db31320 QW |
72 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
73 | ||
74 | btrfs_info(fs_info, "last unmount of filesystem %pU", fs_info->fs_devices->fsid); | |
75 | close_ctree(fs_info); | |
75dfe396 CM |
76 | } |
77 | ||
17b36120 JB |
78 | /* Store the mount options related information. */ |
79 | struct btrfs_fs_context { | |
80 | char *subvol_name; | |
81 | u64 subvol_objectid; | |
82 | u64 max_inline; | |
83 | u32 commit_interval; | |
84 | u32 metadata_ratio; | |
85 | u32 thread_pool_size; | |
c3ece6b7 | 86 | unsigned long long mount_opt; |
17b36120 JB |
87 | unsigned long compress_type:4; |
88 | unsigned int compress_level; | |
3bb17a25 | 89 | refcount_t refs; |
17b36120 JB |
90 | }; |
91 | ||
95e05289 | 92 | enum { |
6941823c | 93 | Opt_acl, |
416a7202 DS |
94 | Opt_clear_cache, |
95 | Opt_commit_interval, | |
96 | Opt_compress, | |
97 | Opt_compress_force, | |
98 | Opt_compress_force_type, | |
99 | Opt_compress_type, | |
100 | Opt_degraded, | |
101 | Opt_device, | |
102 | Opt_fatal_errors, | |
6941823c | 103 | Opt_flushoncommit, |
416a7202 | 104 | Opt_max_inline, |
6941823c JB |
105 | Opt_barrier, |
106 | Opt_datacow, | |
107 | Opt_datasum, | |
108 | Opt_defrag, | |
109 | Opt_discard, | |
b0643e59 | 110 | Opt_discard_mode, |
416a7202 DS |
111 | Opt_ratio, |
112 | Opt_rescan_uuid_tree, | |
113 | Opt_skip_balance, | |
6941823c | 114 | Opt_space_cache, |
416a7202 | 115 | Opt_space_cache_version, |
6941823c JB |
116 | Opt_ssd, |
117 | Opt_ssd_spread, | |
416a7202 | 118 | Opt_subvol, |
37becec9 | 119 | Opt_subvol_empty, |
416a7202 DS |
120 | Opt_subvolid, |
121 | Opt_thread_pool, | |
6941823c | 122 | Opt_treelog, |
416a7202 | 123 | Opt_user_subvol_rm_allowed, |
440861b1 | 124 | Opt_norecovery, |
416a7202 | 125 | |
74ef0018 QW |
126 | /* Rescue options */ |
127 | Opt_rescue, | |
128 | Opt_usebackuproot, | |
129 | Opt_nologreplay, | |
130 | ||
416a7202 | 131 | /* Debugging options */ |
6941823c | 132 | Opt_enospc_debug, |
d0bd4560 | 133 | #ifdef CONFIG_BTRFS_DEBUG |
15ddcdd3 | 134 | Opt_fragment, Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, |
fb592373 JB |
135 | #endif |
136 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
137 | Opt_ref_verify, | |
d0bd4560 | 138 | #endif |
9555c6c1 | 139 | Opt_err, |
95e05289 CM |
140 | }; |
141 | ||
15ddcdd3 JB |
142 | enum { |
143 | Opt_fatal_errors_panic, | |
144 | Opt_fatal_errors_bug, | |
145 | }; | |
416a7202 | 146 | |
15ddcdd3 JB |
147 | static const struct constant_table btrfs_parameter_fatal_errors[] = { |
148 | { "panic", Opt_fatal_errors_panic }, | |
149 | { "bug", Opt_fatal_errors_bug }, | |
150 | {} | |
151 | }; | |
152 | ||
153 | enum { | |
154 | Opt_discard_sync, | |
155 | Opt_discard_async, | |
156 | }; | |
157 | ||
158 | static const struct constant_table btrfs_parameter_discard[] = { | |
159 | { "sync", Opt_discard_sync }, | |
160 | { "async", Opt_discard_async }, | |
161 | {} | |
162 | }; | |
163 | ||
164 | enum { | |
165 | Opt_space_cache_v1, | |
166 | Opt_space_cache_v2, | |
167 | }; | |
168 | ||
169 | static const struct constant_table btrfs_parameter_space_cache[] = { | |
170 | { "v1", Opt_space_cache_v1 }, | |
171 | { "v2", Opt_space_cache_v2 }, | |
172 | {} | |
173 | }; | |
174 | ||
175 | enum { | |
176 | Opt_rescue_usebackuproot, | |
177 | Opt_rescue_nologreplay, | |
178 | Opt_rescue_ignorebadroots, | |
179 | Opt_rescue_ignoredatacsums, | |
169aaaf2 | 180 | Opt_rescue_ignoremetacsums, |
32e62165 | 181 | Opt_rescue_ignoresuperflags, |
15ddcdd3 JB |
182 | Opt_rescue_parameter_all, |
183 | }; | |
184 | ||
185 | static const struct constant_table btrfs_parameter_rescue[] = { | |
186 | { "usebackuproot", Opt_rescue_usebackuproot }, | |
187 | { "nologreplay", Opt_rescue_nologreplay }, | |
188 | { "ignorebadroots", Opt_rescue_ignorebadroots }, | |
189 | { "ibadroots", Opt_rescue_ignorebadroots }, | |
190 | { "ignoredatacsums", Opt_rescue_ignoredatacsums }, | |
169aaaf2 | 191 | { "ignoremetacsums", Opt_rescue_ignoremetacsums}, |
32e62165 | 192 | { "ignoresuperflags", Opt_rescue_ignoresuperflags}, |
15ddcdd3 | 193 | { "idatacsums", Opt_rescue_ignoredatacsums }, |
169aaaf2 | 194 | { "imetacsums", Opt_rescue_ignoremetacsums}, |
32e62165 | 195 | { "isuperflags", Opt_rescue_ignoresuperflags}, |
15ddcdd3 JB |
196 | { "all", Opt_rescue_parameter_all }, |
197 | {} | |
198 | }; | |
199 | ||
200 | #ifdef CONFIG_BTRFS_DEBUG | |
201 | enum { | |
202 | Opt_fragment_parameter_data, | |
203 | Opt_fragment_parameter_metadata, | |
204 | Opt_fragment_parameter_all, | |
205 | }; | |
206 | ||
207 | static const struct constant_table btrfs_parameter_fragment[] = { | |
208 | { "data", Opt_fragment_parameter_data }, | |
209 | { "metadata", Opt_fragment_parameter_metadata }, | |
210 | { "all", Opt_fragment_parameter_all }, | |
211 | {} | |
212 | }; | |
213 | #endif | |
214 | ||
ad21f15b | 215 | static const struct fs_parameter_spec btrfs_fs_parameters[] = { |
15ddcdd3 JB |
216 | fsparam_flag_no("acl", Opt_acl), |
217 | fsparam_flag_no("autodefrag", Opt_defrag), | |
218 | fsparam_flag_no("barrier", Opt_barrier), | |
219 | fsparam_flag("clear_cache", Opt_clear_cache), | |
220 | fsparam_u32("commit", Opt_commit_interval), | |
221 | fsparam_flag("compress", Opt_compress), | |
222 | fsparam_string("compress", Opt_compress_type), | |
223 | fsparam_flag("compress-force", Opt_compress_force), | |
224 | fsparam_string("compress-force", Opt_compress_force_type), | |
225 | fsparam_flag_no("datacow", Opt_datacow), | |
226 | fsparam_flag_no("datasum", Opt_datasum), | |
227 | fsparam_flag("degraded", Opt_degraded), | |
228 | fsparam_string("device", Opt_device), | |
229 | fsparam_flag_no("discard", Opt_discard), | |
230 | fsparam_enum("discard", Opt_discard_mode, btrfs_parameter_discard), | |
231 | fsparam_enum("fatal_errors", Opt_fatal_errors, btrfs_parameter_fatal_errors), | |
232 | fsparam_flag_no("flushoncommit", Opt_flushoncommit), | |
15ddcdd3 JB |
233 | fsparam_string("max_inline", Opt_max_inline), |
234 | fsparam_u32("metadata_ratio", Opt_ratio), | |
235 | fsparam_flag("rescan_uuid_tree", Opt_rescan_uuid_tree), | |
236 | fsparam_flag("skip_balance", Opt_skip_balance), | |
237 | fsparam_flag_no("space_cache", Opt_space_cache), | |
238 | fsparam_enum("space_cache", Opt_space_cache_version, btrfs_parameter_space_cache), | |
239 | fsparam_flag_no("ssd", Opt_ssd), | |
240 | fsparam_flag_no("ssd_spread", Opt_ssd_spread), | |
241 | fsparam_string("subvol", Opt_subvol), | |
242 | fsparam_flag("subvol=", Opt_subvol_empty), | |
243 | fsparam_u64("subvolid", Opt_subvolid), | |
244 | fsparam_u32("thread_pool", Opt_thread_pool), | |
245 | fsparam_flag_no("treelog", Opt_treelog), | |
246 | fsparam_flag("user_subvol_rm_allowed", Opt_user_subvol_rm_allowed), | |
247 | ||
248 | /* Rescue options. */ | |
249 | fsparam_enum("rescue", Opt_rescue, btrfs_parameter_rescue), | |
74ef0018 | 250 | /* Deprecated, with alias rescue=nologreplay */ |
15ddcdd3 | 251 | __fsparam(NULL, "nologreplay", Opt_nologreplay, fs_param_deprecated, NULL), |
74ef0018 | 252 | /* Deprecated, with alias rescue=usebackuproot */ |
15ddcdd3 | 253 | __fsparam(NULL, "usebackuproot", Opt_usebackuproot, fs_param_deprecated, NULL), |
440861b1 QW |
254 | /* For compatibility only, alias for "rescue=nologreplay". */ |
255 | fsparam_flag("norecovery", Opt_norecovery), | |
74ef0018 | 256 | |
15ddcdd3 JB |
257 | /* Debugging options. */ |
258 | fsparam_flag_no("enospc_debug", Opt_enospc_debug), | |
d0bd4560 | 259 | #ifdef CONFIG_BTRFS_DEBUG |
15ddcdd3 | 260 | fsparam_enum("fragment", Opt_fragment, btrfs_parameter_fragment), |
fb592373 JB |
261 | #endif |
262 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
15ddcdd3 | 263 | fsparam_flag("ref_verify", Opt_ref_verify), |
d0bd4560 | 264 | #endif |
15ddcdd3 | 265 | {} |
95e05289 CM |
266 | }; |
267 | ||
affc5af3 LT |
268 | /* No support for restricting writes to btrfs devices yet... */ |
269 | static inline blk_mode_t btrfs_open_mode(struct fs_context *fc) | |
d70bf748 | 270 | { |
affc5af3 | 271 | return sb_open_mode(fc->sb_flags) & ~BLK_OPEN_RESTRICT_WRITES; |
d70bf748 JB |
272 | } |
273 | ||
17b36120 | 274 | static int btrfs_parse_param(struct fs_context *fc, struct fs_parameter *param) |
74ef0018 | 275 | { |
17b36120 JB |
276 | struct btrfs_fs_context *ctx = fc->fs_private; |
277 | struct fs_parse_result result; | |
278 | int opt; | |
74ef0018 | 279 | |
17b36120 JB |
280 | opt = fs_parse(fc, btrfs_fs_parameters, param, &result); |
281 | if (opt < 0) | |
282 | return opt; | |
74ef0018 | 283 | |
17b36120 JB |
284 | switch (opt) { |
285 | case Opt_degraded: | |
286 | btrfs_set_opt(ctx->mount_opt, DEGRADED); | |
287 | break; | |
288 | case Opt_subvol_empty: | |
289 | /* | |
290 | * This exists because we used to allow it on accident, so we're | |
291 | * keeping it to maintain ABI. See 37becec95ac3 ("Btrfs: allow | |
292 | * empty subvol= again"). | |
293 | */ | |
294 | break; | |
295 | case Opt_subvol: | |
296 | kfree(ctx->subvol_name); | |
297 | ctx->subvol_name = kstrdup(param->string, GFP_KERNEL); | |
298 | if (!ctx->subvol_name) | |
299 | return -ENOMEM; | |
300 | break; | |
301 | case Opt_subvolid: | |
302 | ctx->subvol_objectid = result.uint_64; | |
74ef0018 | 303 | |
17b36120 JB |
304 | /* subvolid=0 means give me the original fs_tree. */ |
305 | if (!ctx->subvol_objectid) | |
306 | ctx->subvol_objectid = BTRFS_FS_TREE_OBJECTID; | |
307 | break; | |
308 | case Opt_device: { | |
309 | struct btrfs_device *device; | |
affc5af3 | 310 | blk_mode_t mode = btrfs_open_mode(fc); |
74ef0018 | 311 | |
17b36120 JB |
312 | mutex_lock(&uuid_mutex); |
313 | device = btrfs_scan_one_device(param->string, mode, false); | |
314 | mutex_unlock(&uuid_mutex); | |
315 | if (IS_ERR(device)) | |
316 | return PTR_ERR(device); | |
317 | break; | |
74ef0018 | 318 | } |
17b36120 JB |
319 | case Opt_datasum: |
320 | if (result.negated) { | |
321 | btrfs_set_opt(ctx->mount_opt, NODATASUM); | |
5d1ab66c | 322 | } else { |
17b36120 JB |
323 | btrfs_clear_opt(ctx->mount_opt, NODATACOW); |
324 | btrfs_clear_opt(ctx->mount_opt, NODATASUM); | |
5d1ab66c | 325 | } |
17b36120 JB |
326 | break; |
327 | case Opt_datacow: | |
328 | if (result.negated) { | |
329 | btrfs_clear_opt(ctx->mount_opt, COMPRESS); | |
330 | btrfs_clear_opt(ctx->mount_opt, FORCE_COMPRESS); | |
331 | btrfs_set_opt(ctx->mount_opt, NODATACOW); | |
332 | btrfs_set_opt(ctx->mount_opt, NODATASUM); | |
333 | } else { | |
334 | btrfs_clear_opt(ctx->mount_opt, NODATACOW); | |
335 | } | |
336 | break; | |
337 | case Opt_compress_force: | |
338 | case Opt_compress_force_type: | |
339 | btrfs_set_opt(ctx->mount_opt, FORCE_COMPRESS); | |
340 | fallthrough; | |
341 | case Opt_compress: | |
342 | case Opt_compress_type: | |
343 | if (opt == Opt_compress || opt == Opt_compress_force) { | |
344 | ctx->compress_type = BTRFS_COMPRESS_ZLIB; | |
345 | ctx->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; | |
346 | btrfs_set_opt(ctx->mount_opt, COMPRESS); | |
347 | btrfs_clear_opt(ctx->mount_opt, NODATACOW); | |
348 | btrfs_clear_opt(ctx->mount_opt, NODATASUM); | |
349 | } else if (strncmp(param->string, "zlib", 4) == 0) { | |
350 | ctx->compress_type = BTRFS_COMPRESS_ZLIB; | |
351 | ctx->compress_level = | |
352 | btrfs_compress_str2level(BTRFS_COMPRESS_ZLIB, | |
353 | param->string + 4); | |
354 | btrfs_set_opt(ctx->mount_opt, COMPRESS); | |
355 | btrfs_clear_opt(ctx->mount_opt, NODATACOW); | |
356 | btrfs_clear_opt(ctx->mount_opt, NODATASUM); | |
357 | } else if (strncmp(param->string, "lzo", 3) == 0) { | |
358 | ctx->compress_type = BTRFS_COMPRESS_LZO; | |
359 | ctx->compress_level = 0; | |
360 | btrfs_set_opt(ctx->mount_opt, COMPRESS); | |
361 | btrfs_clear_opt(ctx->mount_opt, NODATACOW); | |
362 | btrfs_clear_opt(ctx->mount_opt, NODATASUM); | |
363 | } else if (strncmp(param->string, "zstd", 4) == 0) { | |
364 | ctx->compress_type = BTRFS_COMPRESS_ZSTD; | |
365 | ctx->compress_level = | |
366 | btrfs_compress_str2level(BTRFS_COMPRESS_ZSTD, | |
367 | param->string + 4); | |
368 | btrfs_set_opt(ctx->mount_opt, COMPRESS); | |
369 | btrfs_clear_opt(ctx->mount_opt, NODATACOW); | |
370 | btrfs_clear_opt(ctx->mount_opt, NODATASUM); | |
371 | } else if (strncmp(param->string, "no", 2) == 0) { | |
372 | ctx->compress_level = 0; | |
373 | ctx->compress_type = 0; | |
374 | btrfs_clear_opt(ctx->mount_opt, COMPRESS); | |
375 | btrfs_clear_opt(ctx->mount_opt, FORCE_COMPRESS); | |
376 | } else { | |
377 | btrfs_err(NULL, "unrecognized compression value %s", | |
378 | param->string); | |
379 | return -EINVAL; | |
380 | } | |
381 | break; | |
382 | case Opt_ssd: | |
383 | if (result.negated) { | |
384 | btrfs_set_opt(ctx->mount_opt, NOSSD); | |
385 | btrfs_clear_opt(ctx->mount_opt, SSD); | |
386 | btrfs_clear_opt(ctx->mount_opt, SSD_SPREAD); | |
387 | } else { | |
388 | btrfs_set_opt(ctx->mount_opt, SSD); | |
389 | btrfs_clear_opt(ctx->mount_opt, NOSSD); | |
390 | } | |
391 | break; | |
392 | case Opt_ssd_spread: | |
393 | if (result.negated) { | |
394 | btrfs_clear_opt(ctx->mount_opt, SSD_SPREAD); | |
395 | } else { | |
396 | btrfs_set_opt(ctx->mount_opt, SSD); | |
397 | btrfs_set_opt(ctx->mount_opt, SSD_SPREAD); | |
398 | btrfs_clear_opt(ctx->mount_opt, NOSSD); | |
399 | } | |
400 | break; | |
401 | case Opt_barrier: | |
402 | if (result.negated) | |
403 | btrfs_set_opt(ctx->mount_opt, NOBARRIER); | |
404 | else | |
405 | btrfs_clear_opt(ctx->mount_opt, NOBARRIER); | |
406 | break; | |
407 | case Opt_thread_pool: | |
408 | if (result.uint_32 == 0) { | |
409 | btrfs_err(NULL, "invalid value 0 for thread_pool"); | |
410 | return -EINVAL; | |
411 | } | |
412 | ctx->thread_pool_size = result.uint_32; | |
413 | break; | |
414 | case Opt_max_inline: | |
415 | ctx->max_inline = memparse(param->string, NULL); | |
416 | break; | |
417 | case Opt_acl: | |
418 | if (result.negated) { | |
419 | fc->sb_flags &= ~SB_POSIXACL; | |
420 | } else { | |
45ff35d6 | 421 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
17b36120 | 422 | fc->sb_flags |= SB_POSIXACL; |
45ff35d6 | 423 | #else |
17b36120 JB |
424 | btrfs_err(NULL, "support for ACL not compiled in"); |
425 | return -EINVAL; | |
45ff35d6 | 426 | #endif |
17b36120 JB |
427 | } |
428 | /* | |
429 | * VFS limits the ability to toggle ACL on and off via remount, | |
430 | * despite every file system allowing this. This seems to be | |
431 | * an oversight since we all do, but it'll fail if we're | |
432 | * remounting. So don't set the mask here, we'll check it in | |
433 | * btrfs_reconfigure and do the toggling ourselves. | |
434 | */ | |
435 | if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) | |
436 | fc->sb_flags_mask |= SB_POSIXACL; | |
437 | break; | |
438 | case Opt_treelog: | |
439 | if (result.negated) | |
440 | btrfs_set_opt(ctx->mount_opt, NOTREELOG); | |
441 | else | |
442 | btrfs_clear_opt(ctx->mount_opt, NOTREELOG); | |
443 | break; | |
17b36120 JB |
444 | case Opt_nologreplay: |
445 | btrfs_warn(NULL, | |
74ef0018 | 446 | "'nologreplay' is deprecated, use 'rescue=nologreplay' instead"); |
17b36120 JB |
447 | btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY); |
448 | break; | |
440861b1 QW |
449 | case Opt_norecovery: |
450 | btrfs_info(NULL, | |
451 | "'norecovery' is for compatibility only, recommended to use 'rescue=nologreplay'"); | |
452 | btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY); | |
453 | break; | |
17b36120 JB |
454 | case Opt_flushoncommit: |
455 | if (result.negated) | |
456 | btrfs_clear_opt(ctx->mount_opt, FLUSHONCOMMIT); | |
457 | else | |
458 | btrfs_set_opt(ctx->mount_opt, FLUSHONCOMMIT); | |
459 | break; | |
460 | case Opt_ratio: | |
461 | ctx->metadata_ratio = result.uint_32; | |
462 | break; | |
463 | case Opt_discard: | |
464 | if (result.negated) { | |
465 | btrfs_clear_opt(ctx->mount_opt, DISCARD_SYNC); | |
466 | btrfs_clear_opt(ctx->mount_opt, DISCARD_ASYNC); | |
467 | btrfs_set_opt(ctx->mount_opt, NODISCARD); | |
468 | } else { | |
469 | btrfs_set_opt(ctx->mount_opt, DISCARD_SYNC); | |
470 | btrfs_clear_opt(ctx->mount_opt, DISCARD_ASYNC); | |
471 | } | |
472 | break; | |
473 | case Opt_discard_mode: | |
474 | switch (result.uint_32) { | |
475 | case Opt_discard_sync: | |
476 | btrfs_clear_opt(ctx->mount_opt, DISCARD_ASYNC); | |
477 | btrfs_set_opt(ctx->mount_opt, DISCARD_SYNC); | |
0af3d00b | 478 | break; |
17b36120 JB |
479 | case Opt_discard_async: |
480 | btrfs_clear_opt(ctx->mount_opt, DISCARD_SYNC); | |
481 | btrfs_set_opt(ctx->mount_opt, DISCARD_ASYNC); | |
4260f7c7 | 482 | break; |
17b36120 JB |
483 | default: |
484 | btrfs_err(NULL, "unrecognized discard mode value %s", | |
485 | param->key); | |
486 | return -EINVAL; | |
487 | } | |
488 | btrfs_clear_opt(ctx->mount_opt, NODISCARD); | |
489 | break; | |
490 | case Opt_space_cache: | |
491 | if (result.negated) { | |
492 | btrfs_set_opt(ctx->mount_opt, NOSPACECACHE); | |
493 | btrfs_clear_opt(ctx->mount_opt, SPACE_CACHE); | |
494 | btrfs_clear_opt(ctx->mount_opt, FREE_SPACE_TREE); | |
495 | } else { | |
496 | btrfs_clear_opt(ctx->mount_opt, FREE_SPACE_TREE); | |
497 | btrfs_set_opt(ctx->mount_opt, SPACE_CACHE); | |
498 | } | |
499 | break; | |
500 | case Opt_space_cache_version: | |
501 | switch (result.uint_32) { | |
502 | case Opt_space_cache_v1: | |
503 | btrfs_set_opt(ctx->mount_opt, SPACE_CACHE); | |
504 | btrfs_clear_opt(ctx->mount_opt, FREE_SPACE_TREE); | |
91435650 | 505 | break; |
17b36120 JB |
506 | case Opt_space_cache_v2: |
507 | btrfs_clear_opt(ctx->mount_opt, SPACE_CACHE); | |
508 | btrfs_set_opt(ctx->mount_opt, FREE_SPACE_TREE); | |
53036293 | 509 | break; |
17b36120 JB |
510 | default: |
511 | btrfs_err(NULL, "unrecognized space_cache value %s", | |
512 | param->key); | |
513 | return -EINVAL; | |
514 | } | |
515 | break; | |
516 | case Opt_rescan_uuid_tree: | |
517 | btrfs_set_opt(ctx->mount_opt, RESCAN_UUID_TREE); | |
518 | break; | |
17b36120 JB |
519 | case Opt_clear_cache: |
520 | btrfs_set_opt(ctx->mount_opt, CLEAR_CACHE); | |
521 | break; | |
522 | case Opt_user_subvol_rm_allowed: | |
523 | btrfs_set_opt(ctx->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
524 | break; | |
525 | case Opt_enospc_debug: | |
526 | if (result.negated) | |
527 | btrfs_clear_opt(ctx->mount_opt, ENOSPC_DEBUG); | |
528 | else | |
529 | btrfs_set_opt(ctx->mount_opt, ENOSPC_DEBUG); | |
530 | break; | |
531 | case Opt_defrag: | |
532 | if (result.negated) | |
533 | btrfs_clear_opt(ctx->mount_opt, AUTO_DEFRAG); | |
534 | else | |
535 | btrfs_set_opt(ctx->mount_opt, AUTO_DEFRAG); | |
536 | break; | |
537 | case Opt_usebackuproot: | |
538 | btrfs_warn(NULL, | |
539 | "'usebackuproot' is deprecated, use 'rescue=usebackuproot' instead"); | |
540 | btrfs_set_opt(ctx->mount_opt, USEBACKUPROOT); | |
9fb3b1a7 JB |
541 | |
542 | /* If we're loading the backup roots we can't trust the space cache. */ | |
543 | btrfs_set_opt(ctx->mount_opt, CLEAR_CACHE); | |
17b36120 JB |
544 | break; |
545 | case Opt_skip_balance: | |
546 | btrfs_set_opt(ctx->mount_opt, SKIP_BALANCE); | |
547 | break; | |
548 | case Opt_fatal_errors: | |
549 | switch (result.uint_32) { | |
550 | case Opt_fatal_errors_panic: | |
551 | btrfs_set_opt(ctx->mount_opt, PANIC_ON_FATAL_ERROR); | |
4cb5300b | 552 | break; |
17b36120 JB |
553 | case Opt_fatal_errors_bug: |
554 | btrfs_clear_opt(ctx->mount_opt, PANIC_ON_FATAL_ERROR); | |
fc0ca9af | 555 | break; |
17b36120 JB |
556 | default: |
557 | btrfs_err(NULL, "unrecognized fatal_errors value %s", | |
558 | param->key); | |
559 | return -EINVAL; | |
560 | } | |
561 | break; | |
562 | case Opt_commit_interval: | |
563 | ctx->commit_interval = result.uint_32; | |
564 | if (ctx->commit_interval == 0) | |
565 | ctx->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
566 | break; | |
567 | case Opt_rescue: | |
568 | switch (result.uint_32) { | |
569 | case Opt_rescue_usebackuproot: | |
570 | btrfs_set_opt(ctx->mount_opt, USEBACKUPROOT); | |
af31f5e5 | 571 | break; |
17b36120 JB |
572 | case Opt_rescue_nologreplay: |
573 | btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY); | |
9555c6c1 | 574 | break; |
17b36120 JB |
575 | case Opt_rescue_ignorebadroots: |
576 | btrfs_set_opt(ctx->mount_opt, IGNOREBADROOTS); | |
8c342930 | 577 | break; |
17b36120 JB |
578 | case Opt_rescue_ignoredatacsums: |
579 | btrfs_set_opt(ctx->mount_opt, IGNOREDATACSUMS); | |
8b87dc17 | 580 | break; |
169aaaf2 QW |
581 | case Opt_rescue_ignoremetacsums: |
582 | btrfs_set_opt(ctx->mount_opt, IGNOREMETACSUMS); | |
583 | break; | |
32e62165 QW |
584 | case Opt_rescue_ignoresuperflags: |
585 | btrfs_set_opt(ctx->mount_opt, IGNORESUPERFLAGS); | |
586 | break; | |
17b36120 JB |
587 | case Opt_rescue_parameter_all: |
588 | btrfs_set_opt(ctx->mount_opt, IGNOREDATACSUMS); | |
169aaaf2 | 589 | btrfs_set_opt(ctx->mount_opt, IGNOREMETACSUMS); |
32e62165 | 590 | btrfs_set_opt(ctx->mount_opt, IGNORESUPERFLAGS); |
17b36120 JB |
591 | btrfs_set_opt(ctx->mount_opt, IGNOREBADROOTS); |
592 | btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY); | |
74ef0018 | 593 | break; |
17b36120 JB |
594 | default: |
595 | btrfs_info(NULL, "unrecognized rescue option '%s'", | |
596 | param->key); | |
597 | return -EINVAL; | |
598 | } | |
599 | break; | |
d0bd4560 | 600 | #ifdef CONFIG_BTRFS_DEBUG |
17b36120 JB |
601 | case Opt_fragment: |
602 | switch (result.uint_32) { | |
603 | case Opt_fragment_parameter_all: | |
604 | btrfs_set_opt(ctx->mount_opt, FRAGMENT_DATA); | |
605 | btrfs_set_opt(ctx->mount_opt, FRAGMENT_METADATA); | |
d0bd4560 | 606 | break; |
17b36120 JB |
607 | case Opt_fragment_parameter_metadata: |
608 | btrfs_set_opt(ctx->mount_opt, FRAGMENT_METADATA); | |
d0bd4560 | 609 | break; |
17b36120 JB |
610 | case Opt_fragment_parameter_data: |
611 | btrfs_set_opt(ctx->mount_opt, FRAGMENT_DATA); | |
d0bd4560 | 612 | break; |
17b36120 JB |
613 | default: |
614 | btrfs_info(NULL, "unrecognized fragment option '%s'", | |
615 | param->key); | |
616 | return -EINVAL; | |
617 | } | |
618 | break; | |
fb592373 JB |
619 | #endif |
620 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY | |
17b36120 JB |
621 | case Opt_ref_verify: |
622 | btrfs_set_opt(ctx->mount_opt, REF_VERIFY); | |
623 | break; | |
d0bd4560 | 624 | #endif |
17b36120 JB |
625 | default: |
626 | btrfs_err(NULL, "unrecognized mount option '%s'", param->key); | |
627 | return -EINVAL; | |
95e05289 | 628 | } |
d70bf748 | 629 | |
17b36120 | 630 | return 0; |
edf24abe CH |
631 | } |
632 | ||
633 | /* | |
83e3a40a JB |
634 | * Some options only have meaning at mount time and shouldn't persist across |
635 | * remounts, or be displayed. Clear these at the end of mount and remount code | |
636 | * paths. | |
edf24abe | 637 | */ |
83e3a40a | 638 | static void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info) |
edf24abe | 639 | { |
83e3a40a JB |
640 | btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT); |
641 | btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE); | |
642 | btrfs_clear_opt(fs_info->mount_opt, NOSPACECACHE); | |
643 | } | |
d7407606 | 644 | |
2917f741 | 645 | static bool check_ro_option(const struct btrfs_fs_info *fs_info, |
c3ece6b7 | 646 | unsigned long long mount_opt, unsigned long long opt, |
d70bf748 JB |
647 | const char *opt_name) |
648 | { | |
eddb1a43 | 649 | if (mount_opt & opt) { |
d70bf748 JB |
650 | btrfs_err(fs_info, "%s must be used with ro mount option", |
651 | opt_name); | |
652 | return true; | |
653 | } | |
654 | return false; | |
655 | } | |
5139cff5 | 656 | |
c3ece6b7 QW |
657 | bool btrfs_check_options(const struct btrfs_fs_info *info, |
658 | unsigned long long *mount_opt, | |
ad21f15b | 659 | unsigned long flags) |
2b41b19d JB |
660 | { |
661 | bool ret = true; | |
d7407606 | 662 | |
2b41b19d | 663 | if (!(flags & SB_RDONLY) && |
eddb1a43 JB |
664 | (check_ro_option(info, *mount_opt, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || |
665 | check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || | |
169aaaf2 | 666 | check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums") || |
32e62165 QW |
667 | check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNOREMETACSUMS, "ignoremetacsums") || |
668 | check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNORESUPERFLAGS, "ignoresuperflags"))) | |
2b41b19d | 669 | ret = false; |
d7407606 | 670 | |
2b41b19d | 671 | if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && |
eddb1a43 JB |
672 | !btrfs_raw_test_opt(*mount_opt, FREE_SPACE_TREE) && |
673 | !btrfs_raw_test_opt(*mount_opt, CLEAR_CACHE)) { | |
2b41b19d JB |
674 | btrfs_err(info, "cannot disable free-space-tree"); |
675 | ret = false; | |
676 | } | |
677 | if (btrfs_fs_compat_ro(info, BLOCK_GROUP_TREE) && | |
eddb1a43 | 678 | !btrfs_raw_test_opt(*mount_opt, FREE_SPACE_TREE)) { |
2b41b19d JB |
679 | btrfs_err(info, "cannot disable free-space-tree with block-group-tree feature"); |
680 | ret = false; | |
681 | } | |
d7407606 | 682 | |
eddb1a43 | 683 | if (btrfs_check_mountopts_zoned(info, mount_opt)) |
2b41b19d | 684 | ret = false; |
d7407606 | 685 | |
2b41b19d | 686 | if (!test_bit(BTRFS_FS_STATE_REMOUNTING, &info->fs_state)) { |
1e7bec1f | 687 | if (btrfs_raw_test_opt(*mount_opt, SPACE_CACHE)) { |
2b41b19d | 688 | btrfs_info(info, "disk space caching is enabled"); |
1e7bec1f JB |
689 | btrfs_warn(info, |
690 | "space cache v1 is being deprecated and will be removed in a future release, please use -o space_cache=v2"); | |
691 | } | |
eddb1a43 | 692 | if (btrfs_raw_test_opt(*mount_opt, FREE_SPACE_TREE)) |
2b41b19d | 693 | btrfs_info(info, "using free-space-tree"); |
d7407606 MT |
694 | } |
695 | ||
2b41b19d | 696 | return ret; |
d7407606 MT |
697 | } |
698 | ||
699 | /* | |
a6a8f22a JB |
700 | * This is subtle, we only call this during open_ctree(). We need to pre-load |
701 | * the mount options with the on-disk settings. Before the new mount API took | |
702 | * effect we would do this on mount and remount. With the new mount API we'll | |
703 | * only do this on the initial mount. | |
d7407606 | 704 | * |
a6a8f22a JB |
705 | * This isn't a change in behavior, because we're using the current state of the |
706 | * file system to set the current mount options. If you mounted with special | |
707 | * options to disable these features and then remounted we wouldn't revert the | |
708 | * settings, because mounting without these features cleared the on-disk | |
709 | * settings, so this being called on re-mount is not needed. | |
d7407606 | 710 | */ |
a6a8f22a | 711 | void btrfs_set_free_space_cache_settings(struct btrfs_fs_info *fs_info) |
d7407606 | 712 | { |
a6a8f22a JB |
713 | if (fs_info->sectorsize < PAGE_SIZE) { |
714 | btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE); | |
715 | if (!btrfs_test_opt(fs_info, FREE_SPACE_TREE)) { | |
716 | btrfs_info(fs_info, | |
717 | "forcing free space tree for sector size %u with page size %lu", | |
718 | fs_info->sectorsize, PAGE_SIZE); | |
719 | btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE); | |
720 | } | |
721 | } | |
edf24abe CH |
722 | |
723 | /* | |
ad21f15b JB |
724 | * At this point our mount options are populated, so we only mess with |
725 | * these settings if we don't have any settings already. | |
edf24abe | 726 | */ |
ad21f15b JB |
727 | if (btrfs_test_opt(fs_info, FREE_SPACE_TREE)) |
728 | return; | |
edf24abe | 729 | |
ad21f15b JB |
730 | if (btrfs_is_zoned(fs_info) && |
731 | btrfs_free_space_cache_v1_active(fs_info)) { | |
732 | btrfs_info(fs_info, "zoned: clearing existing space cache"); | |
733 | btrfs_set_super_cache_generation(fs_info->super_copy, 0); | |
734 | return; | |
735 | } | |
edf24abe | 736 | |
ad21f15b JB |
737 | if (btrfs_test_opt(fs_info, SPACE_CACHE)) |
738 | return; | |
ccb0e7d1 | 739 | |
ad21f15b JB |
740 | if (btrfs_test_opt(fs_info, NOSPACECACHE)) |
741 | return; | |
ccb0e7d1 | 742 | |
ad21f15b JB |
743 | /* |
744 | * At this point we don't have explicit options set by the user, set | |
745 | * them ourselves based on the state of the file system. | |
746 | */ | |
747 | if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) | |
748 | btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE); | |
749 | else if (btrfs_free_space_cache_v1_active(fs_info)) | |
750 | btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE); | |
a6a8f22a | 751 | } |
edf24abe | 752 | |
41d46b29 JB |
753 | static void set_device_specific_options(struct btrfs_fs_info *fs_info) |
754 | { | |
755 | if (!btrfs_test_opt(fs_info, NOSSD) && | |
756 | !fs_info->fs_devices->rotating) | |
757 | btrfs_set_opt(fs_info->mount_opt, SSD); | |
758 | ||
759 | /* | |
760 | * For devices supporting discard turn on discard=async automatically, | |
761 | * unless it's already set or disabled. This could be turned off by | |
762 | * nodiscard for the same mount. | |
763 | * | |
764 | * The zoned mode piggy backs on the discard functionality for | |
765 | * resetting a zone. There is no reason to delay the zone reset as it is | |
766 | * fast enough. So, do not enable async discard for zoned mode. | |
767 | */ | |
768 | if (!(btrfs_test_opt(fs_info, DISCARD_SYNC) || | |
769 | btrfs_test_opt(fs_info, DISCARD_ASYNC) || | |
770 | btrfs_test_opt(fs_info, NODISCARD)) && | |
771 | fs_info->fs_devices->discardable && | |
772 | !btrfs_is_zoned(fs_info)) | |
773 | btrfs_set_opt(fs_info->mount_opt, DISCARD_ASYNC); | |
95e05289 CM |
774 | } |
775 | ||
c0c907a4 MPS |
776 | char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
777 | u64 subvol_objectid) | |
73f73415 | 778 | { |
815745cf | 779 | struct btrfs_root *root = fs_info->tree_root; |
5168489a | 780 | struct btrfs_root *fs_root = NULL; |
05dbe683 OS |
781 | struct btrfs_root_ref *root_ref; |
782 | struct btrfs_inode_ref *inode_ref; | |
783 | struct btrfs_key key; | |
784 | struct btrfs_path *path = NULL; | |
785 | char *name = NULL, *ptr; | |
786 | u64 dirid; | |
787 | int len; | |
788 | int ret; | |
789 | ||
790 | path = btrfs_alloc_path(); | |
791 | if (!path) { | |
792 | ret = -ENOMEM; | |
793 | goto err; | |
794 | } | |
05dbe683 | 795 | |
3ec83621 | 796 | name = kmalloc(PATH_MAX, GFP_KERNEL); |
05dbe683 OS |
797 | if (!name) { |
798 | ret = -ENOMEM; | |
799 | goto err; | |
800 | } | |
801 | ptr = name + PATH_MAX - 1; | |
802 | ptr[0] = '\0'; | |
73f73415 JB |
803 | |
804 | /* | |
05dbe683 OS |
805 | * Walk up the subvolume trees in the tree of tree roots by root |
806 | * backrefs until we hit the top-level subvolume. | |
73f73415 | 807 | */ |
05dbe683 OS |
808 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
809 | key.objectid = subvol_objectid; | |
810 | key.type = BTRFS_ROOT_BACKREF_KEY; | |
811 | key.offset = (u64)-1; | |
812 | ||
0ff40a91 | 813 | ret = btrfs_search_backwards(root, &key, path); |
05dbe683 OS |
814 | if (ret < 0) { |
815 | goto err; | |
816 | } else if (ret > 0) { | |
0ff40a91 MPS |
817 | ret = -ENOENT; |
818 | goto err; | |
05dbe683 OS |
819 | } |
820 | ||
05dbe683 OS |
821 | subvol_objectid = key.offset; |
822 | ||
823 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
824 | struct btrfs_root_ref); | |
825 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); | |
826 | ptr -= len + 1; | |
827 | if (ptr < name) { | |
828 | ret = -ENAMETOOLONG; | |
829 | goto err; | |
830 | } | |
831 | read_extent_buffer(path->nodes[0], ptr + 1, | |
832 | (unsigned long)(root_ref + 1), len); | |
833 | ptr[0] = '/'; | |
834 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); | |
835 | btrfs_release_path(path); | |
836 | ||
56e9357a | 837 | fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true); |
05dbe683 OS |
838 | if (IS_ERR(fs_root)) { |
839 | ret = PTR_ERR(fs_root); | |
5168489a JB |
840 | fs_root = NULL; |
841 | goto err; | |
842 | } | |
05dbe683 OS |
843 | |
844 | /* | |
845 | * Walk up the filesystem tree by inode refs until we hit the | |
846 | * root directory. | |
847 | */ | |
848 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { | |
849 | key.objectid = dirid; | |
850 | key.type = BTRFS_INODE_REF_KEY; | |
851 | key.offset = (u64)-1; | |
852 | ||
0ff40a91 | 853 | ret = btrfs_search_backwards(fs_root, &key, path); |
05dbe683 OS |
854 | if (ret < 0) { |
855 | goto err; | |
856 | } else if (ret > 0) { | |
0ff40a91 MPS |
857 | ret = -ENOENT; |
858 | goto err; | |
05dbe683 OS |
859 | } |
860 | ||
05dbe683 OS |
861 | dirid = key.offset; |
862 | ||
863 | inode_ref = btrfs_item_ptr(path->nodes[0], | |
864 | path->slots[0], | |
865 | struct btrfs_inode_ref); | |
866 | len = btrfs_inode_ref_name_len(path->nodes[0], | |
867 | inode_ref); | |
868 | ptr -= len + 1; | |
869 | if (ptr < name) { | |
870 | ret = -ENAMETOOLONG; | |
871 | goto err; | |
872 | } | |
873 | read_extent_buffer(path->nodes[0], ptr + 1, | |
874 | (unsigned long)(inode_ref + 1), len); | |
875 | ptr[0] = '/'; | |
876 | btrfs_release_path(path); | |
877 | } | |
00246528 | 878 | btrfs_put_root(fs_root); |
5168489a | 879 | fs_root = NULL; |
73f73415 JB |
880 | } |
881 | ||
05dbe683 OS |
882 | btrfs_free_path(path); |
883 | if (ptr == name + PATH_MAX - 1) { | |
884 | name[0] = '/'; | |
885 | name[1] = '\0'; | |
886 | } else { | |
887 | memmove(name, ptr, name + PATH_MAX - ptr); | |
888 | } | |
889 | return name; | |
890 | ||
891 | err: | |
00246528 | 892 | btrfs_put_root(fs_root); |
05dbe683 OS |
893 | btrfs_free_path(path); |
894 | kfree(name); | |
895 | return ERR_PTR(ret); | |
896 | } | |
897 | ||
898 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) | |
899 | { | |
900 | struct btrfs_root *root = fs_info->tree_root; | |
901 | struct btrfs_dir_item *di; | |
902 | struct btrfs_path *path; | |
903 | struct btrfs_key location; | |
6db75318 | 904 | struct fscrypt_str name = FSTR_INIT("default", 7); |
05dbe683 OS |
905 | u64 dir_id; |
906 | ||
73f73415 JB |
907 | path = btrfs_alloc_path(); |
908 | if (!path) | |
05dbe683 | 909 | return -ENOMEM; |
73f73415 JB |
910 | |
911 | /* | |
912 | * Find the "default" dir item which points to the root item that we | |
913 | * will mount by default if we haven't been given a specific subvolume | |
914 | * to mount. | |
915 | */ | |
815745cf | 916 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
e43eec81 | 917 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, &name, 0); |
b0839166 JL |
918 | if (IS_ERR(di)) { |
919 | btrfs_free_path(path); | |
05dbe683 | 920 | return PTR_ERR(di); |
b0839166 | 921 | } |
73f73415 JB |
922 | if (!di) { |
923 | /* | |
924 | * Ok the default dir item isn't there. This is weird since | |
925 | * it's always been there, but don't freak out, just try and | |
05dbe683 | 926 | * mount the top-level subvolume. |
73f73415 JB |
927 | */ |
928 | btrfs_free_path(path); | |
05dbe683 OS |
929 | *objectid = BTRFS_FS_TREE_OBJECTID; |
930 | return 0; | |
73f73415 JB |
931 | } |
932 | ||
933 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
934 | btrfs_free_path(path); | |
05dbe683 OS |
935 | *objectid = location.objectid; |
936 | return 0; | |
73f73415 JB |
937 | } |
938 | ||
d397712b | 939 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 940 | struct btrfs_fs_devices *fs_devices, |
56e033a7 | 941 | void *data) |
75dfe396 | 942 | { |
d397712b | 943 | struct inode *inode; |
815745cf | 944 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
39279cc3 | 945 | int err; |
a429e513 | 946 | |
39279cc3 CM |
947 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
948 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
949 | sb->s_op = &btrfs_super_ops; | |
af53d29a | 950 | sb->s_d_op = &btrfs_dentry_operations; |
be6e8dc0 | 951 | sb->s_export_op = &btrfs_export_ops; |
14605409 BB |
952 | #ifdef CONFIG_FS_VERITY |
953 | sb->s_vop = &btrfs_verityops; | |
954 | #endif | |
5103e947 | 955 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 956 | sb->s_time_gran = 1; |
da2f0f74 | 957 | sb->s_iflags |= SB_I_CGROUPWB; |
9e11ceee JK |
958 | |
959 | err = super_setup_bdi(sb); | |
960 | if (err) { | |
961 | btrfs_err(fs_info, "super_setup_bdi failed"); | |
962 | return err; | |
963 | } | |
964 | ||
ad2b2c80 AV |
965 | err = open_ctree(sb, fs_devices, (char *)data); |
966 | if (err) { | |
ab8d0fc4 | 967 | btrfs_err(fs_info, "open_ctree failed"); |
ad2b2c80 | 968 | return err; |
a429e513 CM |
969 | } |
970 | ||
d13240dd | 971 | inode = btrfs_iget(BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root); |
5d4f98a2 YZ |
972 | if (IS_ERR(inode)) { |
973 | err = PTR_ERR(inode); | |
13b98989 | 974 | btrfs_handle_fs_error(fs_info, err, NULL); |
39279cc3 | 975 | goto fail_close; |
f254e52c | 976 | } |
f254e52c | 977 | |
48fde701 AV |
978 | sb->s_root = d_make_root(inode); |
979 | if (!sb->s_root) { | |
39279cc3 CM |
980 | err = -ENOMEM; |
981 | goto fail_close; | |
f254e52c | 982 | } |
58176a96 | 983 | |
1751e8a6 | 984 | sb->s_flags |= SB_ACTIVE; |
2619ba1f | 985 | return 0; |
39279cc3 CM |
986 | |
987 | fail_close: | |
6bccf3ab | 988 | close_ctree(fs_info); |
39279cc3 | 989 | return err; |
2619ba1f CM |
990 | } |
991 | ||
6bf13c0c | 992 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
993 | { |
994 | struct btrfs_trans_handle *trans; | |
815745cf AV |
995 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
996 | struct btrfs_root *root = fs_info->tree_root; | |
2619ba1f | 997 | |
bc074524 | 998 | trace_btrfs_sync_fs(fs_info, wait); |
1abe9b8a | 999 | |
39279cc3 | 1000 | if (!wait) { |
815745cf | 1001 | filemap_flush(fs_info->btree_inode->i_mapping); |
39279cc3 CM |
1002 | return 0; |
1003 | } | |
771ed689 | 1004 | |
42317ab4 | 1005 | btrfs_wait_ordered_roots(fs_info, U64_MAX, NULL); |
771ed689 | 1006 | |
d4edf39b | 1007 | trans = btrfs_attach_transaction_barrier(root); |
60376ce4 | 1008 | if (IS_ERR(trans)) { |
354aa0fb | 1009 | /* no transaction, don't bother */ |
6b5fe46d DS |
1010 | if (PTR_ERR(trans) == -ENOENT) { |
1011 | /* | |
1012 | * Exit unless we have some pending changes | |
1013 | * that need to go through commit | |
1014 | */ | |
c52cc7b7 JB |
1015 | if (!test_bit(BTRFS_FS_NEED_TRANS_COMMIT, |
1016 | &fs_info->flags)) | |
6b5fe46d | 1017 | return 0; |
a53f4f8e QW |
1018 | /* |
1019 | * A non-blocking test if the fs is frozen. We must not | |
1020 | * start a new transaction here otherwise a deadlock | |
1021 | * happens. The pending operations are delayed to the | |
1022 | * next commit after thawing. | |
1023 | */ | |
a7e3c5f2 RP |
1024 | if (sb_start_write_trylock(sb)) |
1025 | sb_end_write(sb); | |
a53f4f8e QW |
1026 | else |
1027 | return 0; | |
6b5fe46d | 1028 | trans = btrfs_start_transaction(root, 0); |
6b5fe46d | 1029 | } |
98bd5c54 DS |
1030 | if (IS_ERR(trans)) |
1031 | return PTR_ERR(trans); | |
60376ce4 | 1032 | } |
3a45bb20 | 1033 | return btrfs_commit_transaction(trans); |
2c90e5d6 CM |
1034 | } |
1035 | ||
ab0b4a3e JB |
1036 | static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed) |
1037 | { | |
1038 | seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s); | |
1039 | *printed = true; | |
1040 | } | |
1041 | ||
34c80b1d | 1042 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
a9572a15 | 1043 | { |
815745cf | 1044 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
0f628c63 | 1045 | const char *compress_type; |
3ef3959b | 1046 | const char *subvol_name; |
ab0b4a3e | 1047 | bool printed = false; |
a9572a15 | 1048 | |
3cdde224 | 1049 | if (btrfs_test_opt(info, DEGRADED)) |
a9572a15 | 1050 | seq_puts(seq, ",degraded"); |
3cdde224 | 1051 | if (btrfs_test_opt(info, NODATASUM)) |
a9572a15 | 1052 | seq_puts(seq, ",nodatasum"); |
3cdde224 | 1053 | if (btrfs_test_opt(info, NODATACOW)) |
a9572a15 | 1054 | seq_puts(seq, ",nodatacow"); |
3cdde224 | 1055 | if (btrfs_test_opt(info, NOBARRIER)) |
a9572a15 | 1056 | seq_puts(seq, ",nobarrier"); |
95ac567a | 1057 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
c1c9ff7c | 1058 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
a9572a15 EP |
1059 | if (info->thread_pool_size != min_t(unsigned long, |
1060 | num_online_cpus() + 2, 8)) | |
f7b885be | 1061 | seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); |
3cdde224 | 1062 | if (btrfs_test_opt(info, COMPRESS)) { |
0f628c63 | 1063 | compress_type = btrfs_compress_type2str(info->compress_type); |
3cdde224 | 1064 | if (btrfs_test_opt(info, FORCE_COMPRESS)) |
200da64e TI |
1065 | seq_printf(seq, ",compress-force=%s", compress_type); |
1066 | else | |
1067 | seq_printf(seq, ",compress=%s", compress_type); | |
f51d2b59 | 1068 | if (info->compress_level) |
fa4d885a | 1069 | seq_printf(seq, ":%d", info->compress_level); |
200da64e | 1070 | } |
3cdde224 | 1071 | if (btrfs_test_opt(info, NOSSD)) |
c289811c | 1072 | seq_puts(seq, ",nossd"); |
3cdde224 | 1073 | if (btrfs_test_opt(info, SSD_SPREAD)) |
451d7585 | 1074 | seq_puts(seq, ",ssd_spread"); |
3cdde224 | 1075 | else if (btrfs_test_opt(info, SSD)) |
a9572a15 | 1076 | seq_puts(seq, ",ssd"); |
3cdde224 | 1077 | if (btrfs_test_opt(info, NOTREELOG)) |
6b65c5c6 | 1078 | seq_puts(seq, ",notreelog"); |
3cdde224 | 1079 | if (btrfs_test_opt(info, NOLOGREPLAY)) |
ab0b4a3e | 1080 | print_rescue_option(seq, "nologreplay", &printed); |
68319c18 JB |
1081 | if (btrfs_test_opt(info, USEBACKUPROOT)) |
1082 | print_rescue_option(seq, "usebackuproot", &printed); | |
42437a63 JB |
1083 | if (btrfs_test_opt(info, IGNOREBADROOTS)) |
1084 | print_rescue_option(seq, "ignorebadroots", &printed); | |
882dbe0c JB |
1085 | if (btrfs_test_opt(info, IGNOREDATACSUMS)) |
1086 | print_rescue_option(seq, "ignoredatacsums", &printed); | |
169aaaf2 QW |
1087 | if (btrfs_test_opt(info, IGNOREMETACSUMS)) |
1088 | print_rescue_option(seq, "ignoremetacsums", &printed); | |
32e62165 QW |
1089 | if (btrfs_test_opt(info, IGNORESUPERFLAGS)) |
1090 | print_rescue_option(seq, "ignoresuperflags", &printed); | |
3cdde224 | 1091 | if (btrfs_test_opt(info, FLUSHONCOMMIT)) |
6b65c5c6 | 1092 | seq_puts(seq, ",flushoncommit"); |
46b27f50 | 1093 | if (btrfs_test_opt(info, DISCARD_SYNC)) |
20a5239a | 1094 | seq_puts(seq, ",discard"); |
b0643e59 DZ |
1095 | if (btrfs_test_opt(info, DISCARD_ASYNC)) |
1096 | seq_puts(seq, ",discard=async"); | |
1751e8a6 | 1097 | if (!(info->sb->s_flags & SB_POSIXACL)) |
a9572a15 | 1098 | seq_puts(seq, ",noacl"); |
04c41559 | 1099 | if (btrfs_free_space_cache_v1_active(info)) |
200da64e | 1100 | seq_puts(seq, ",space_cache"); |
04c41559 | 1101 | else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) |
70f6d82e | 1102 | seq_puts(seq, ",space_cache=v2"); |
73bc1876 | 1103 | else |
8965593e | 1104 | seq_puts(seq, ",nospace_cache"); |
3cdde224 | 1105 | if (btrfs_test_opt(info, RESCAN_UUID_TREE)) |
f420ee1e | 1106 | seq_puts(seq, ",rescan_uuid_tree"); |
3cdde224 | 1107 | if (btrfs_test_opt(info, CLEAR_CACHE)) |
200da64e | 1108 | seq_puts(seq, ",clear_cache"); |
3cdde224 | 1109 | if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) |
200da64e | 1110 | seq_puts(seq, ",user_subvol_rm_allowed"); |
3cdde224 | 1111 | if (btrfs_test_opt(info, ENOSPC_DEBUG)) |
0942caa3 | 1112 | seq_puts(seq, ",enospc_debug"); |
3cdde224 | 1113 | if (btrfs_test_opt(info, AUTO_DEFRAG)) |
0942caa3 | 1114 | seq_puts(seq, ",autodefrag"); |
3cdde224 | 1115 | if (btrfs_test_opt(info, SKIP_BALANCE)) |
9555c6c1 | 1116 | seq_puts(seq, ",skip_balance"); |
8507d216 | 1117 | if (info->metadata_ratio) |
764cb8b4 | 1118 | seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); |
3cdde224 | 1119 | if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) |
8c342930 | 1120 | seq_puts(seq, ",fatal_errors=panic"); |
8b87dc17 | 1121 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
d3740608 | 1122 | seq_printf(seq, ",commit=%u", info->commit_interval); |
d0bd4560 | 1123 | #ifdef CONFIG_BTRFS_DEBUG |
3cdde224 | 1124 | if (btrfs_test_opt(info, FRAGMENT_DATA)) |
d0bd4560 | 1125 | seq_puts(seq, ",fragment=data"); |
3cdde224 | 1126 | if (btrfs_test_opt(info, FRAGMENT_METADATA)) |
d0bd4560 JB |
1127 | seq_puts(seq, ",fragment=metadata"); |
1128 | #endif | |
fb592373 JB |
1129 | if (btrfs_test_opt(info, REF_VERIFY)) |
1130 | seq_puts(seq, ",ref_verify"); | |
e094f480 | 1131 | seq_printf(seq, ",subvolid=%llu", btrfs_root_id(BTRFS_I(d_inode(dentry))->root)); |
3ef3959b | 1132 | subvol_name = btrfs_get_subvol_name_from_objectid(info, |
e094f480 | 1133 | btrfs_root_id(BTRFS_I(d_inode(dentry))->root)); |
3ef3959b JB |
1134 | if (!IS_ERR(subvol_name)) { |
1135 | seq_puts(seq, ",subvol="); | |
1136 | seq_escape(seq, subvol_name, " \t\n\\"); | |
1137 | kfree(subvol_name); | |
1138 | } | |
a9572a15 EP |
1139 | return 0; |
1140 | } | |
1141 | ||
f9d9ef62 DS |
1142 | /* |
1143 | * subvolumes are identified by ino 256 | |
1144 | */ | |
1145 | static inline int is_subvolume_inode(struct inode *inode) | |
1146 | { | |
1147 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
1148 | return 1; | |
1149 | return 0; | |
1150 | } | |
1151 | ||
bb289b7b | 1152 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
ae0bc863 | 1153 | struct vfsmount *mnt) |
830c4adb | 1154 | { |
830c4adb | 1155 | struct dentry *root; |
fa330659 | 1156 | int ret; |
830c4adb | 1157 | |
05dbe683 OS |
1158 | if (!subvol_name) { |
1159 | if (!subvol_objectid) { | |
1160 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), | |
1161 | &subvol_objectid); | |
1162 | if (ret) { | |
1163 | root = ERR_PTR(ret); | |
1164 | goto out; | |
1165 | } | |
1166 | } | |
c0c907a4 MPS |
1167 | subvol_name = btrfs_get_subvol_name_from_objectid( |
1168 | btrfs_sb(mnt->mnt_sb), subvol_objectid); | |
05dbe683 OS |
1169 | if (IS_ERR(subvol_name)) { |
1170 | root = ERR_CAST(subvol_name); | |
1171 | subvol_name = NULL; | |
1172 | goto out; | |
1173 | } | |
1174 | ||
1175 | } | |
1176 | ||
ea441d11 | 1177 | root = mount_subtree(mnt, subvol_name); |
fa330659 OS |
1178 | /* mount_subtree() drops our reference on the vfsmount. */ |
1179 | mnt = NULL; | |
830c4adb | 1180 | |
bb289b7b | 1181 | if (!IS_ERR(root)) { |
ea441d11 | 1182 | struct super_block *s = root->d_sb; |
ab8d0fc4 | 1183 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
bb289b7b | 1184 | struct inode *root_inode = d_inode(root); |
e094f480 | 1185 | u64 root_objectid = btrfs_root_id(BTRFS_I(root_inode)->root); |
bb289b7b OS |
1186 | |
1187 | ret = 0; | |
1188 | if (!is_subvolume_inode(root_inode)) { | |
ab8d0fc4 | 1189 | btrfs_err(fs_info, "'%s' is not a valid subvolume", |
bb289b7b OS |
1190 | subvol_name); |
1191 | ret = -EINVAL; | |
1192 | } | |
1193 | if (subvol_objectid && root_objectid != subvol_objectid) { | |
05dbe683 OS |
1194 | /* |
1195 | * This will also catch a race condition where a | |
1196 | * subvolume which was passed by ID is renamed and | |
1197 | * another subvolume is renamed over the old location. | |
1198 | */ | |
ab8d0fc4 JM |
1199 | btrfs_err(fs_info, |
1200 | "subvol '%s' does not match subvolid %llu", | |
1201 | subvol_name, subvol_objectid); | |
bb289b7b OS |
1202 | ret = -EINVAL; |
1203 | } | |
1204 | if (ret) { | |
1205 | dput(root); | |
1206 | root = ERR_PTR(ret); | |
1207 | deactivate_locked_super(s); | |
1208 | } | |
f9d9ef62 DS |
1209 | } |
1210 | ||
fa330659 OS |
1211 | out: |
1212 | mntput(mnt); | |
fa330659 | 1213 | kfree(subvol_name); |
830c4adb JB |
1214 | return root; |
1215 | } | |
450ba0ea | 1216 | |
0d2450ab | 1217 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
f7b885be | 1218 | u32 new_pool_size, u32 old_pool_size) |
72fa39f5 | 1219 | { |
0d2450ab ST |
1220 | if (new_pool_size == old_pool_size) |
1221 | return; | |
72fa39f5 | 1222 | |
0d2450ab | 1223 | fs_info->thread_pool_size = new_pool_size; |
72fa39f5 | 1224 | |
efe120a0 | 1225 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
0d2450ab | 1226 | old_pool_size, new_pool_size); |
72fa39f5 | 1227 | |
5cdc7ad3 | 1228 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
afe3d242 | 1229 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
e66f0bb1 | 1230 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
40fac647 CH |
1231 | workqueue_set_max_active(fs_info->endio_workers, new_pool_size); |
1232 | workqueue_set_max_active(fs_info->endio_meta_workers, new_pool_size); | |
fccb5d86 QW |
1233 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); |
1234 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); | |
5b3bc44e | 1235 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
0d2450ab ST |
1236 | } |
1237 | ||
f42a34b2 | 1238 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
c3ece6b7 | 1239 | unsigned long long old_opts, int flags) |
f42a34b2 | 1240 | { |
dc81cdc5 MX |
1241 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
1242 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || | |
1751e8a6 | 1243 | (flags & SB_RDONLY))) { |
dc81cdc5 MX |
1244 | /* wait for any defraggers to finish */ |
1245 | wait_event(fs_info->transaction_wait, | |
1246 | (atomic_read(&fs_info->defrag_running) == 0)); | |
1751e8a6 | 1247 | if (flags & SB_RDONLY) |
dc81cdc5 | 1248 | sync_filesystem(fs_info->sb); |
81ffd56b | 1249 | } |
dc81cdc5 MX |
1250 | } |
1251 | ||
1252 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, | |
c3ece6b7 | 1253 | unsigned long long old_opts) |
dc81cdc5 | 1254 | { |
94846229 | 1255 | const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE); |
399f7f4c | 1256 | |
bc27d6f0 | 1257 | /* |
180e4d47 LB |
1258 | * We need to cleanup all defragable inodes if the autodefragment is |
1259 | * close or the filesystem is read only. | |
bc27d6f0 | 1260 | */ |
dc81cdc5 | 1261 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
bc98a42c | 1262 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { |
dc81cdc5 | 1263 | btrfs_cleanup_defrag_inodes(fs_info); |
81ffd56b | 1264 | } |
399f7f4c | 1265 | |
b0643e59 DZ |
1266 | /* If we toggled discard async */ |
1267 | if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && | |
1268 | btrfs_test_opt(fs_info, DISCARD_ASYNC)) | |
1269 | btrfs_discard_resume(fs_info); | |
1270 | else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && | |
1271 | !btrfs_test_opt(fs_info, DISCARD_ASYNC)) | |
1272 | btrfs_discard_cleanup(fs_info); | |
399f7f4c | 1273 | |
94846229 BB |
1274 | /* If we toggled space cache */ |
1275 | if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) | |
1276 | btrfs_set_free_space_cache_v1_active(fs_info, cache_opt); | |
dc81cdc5 | 1277 | } |
72fa39f5 | 1278 | |
9ef40c2e JB |
1279 | static int btrfs_remount_rw(struct btrfs_fs_info *fs_info) |
1280 | { | |
1281 | int ret; | |
72fa39f5 | 1282 | |
9ef40c2e JB |
1283 | if (BTRFS_FS_ERROR(fs_info)) { |
1284 | btrfs_err(fs_info, | |
1285 | "remounting read-write after error is not allowed"); | |
1286 | return -EINVAL; | |
72fa39f5 MT |
1287 | } |
1288 | ||
9ef40c2e JB |
1289 | if (fs_info->fs_devices->rw_devices == 0) |
1290 | return -EACCES; | |
1291 | ||
1292 | if (!btrfs_check_rw_degradable(fs_info, NULL)) { | |
1293 | btrfs_warn(fs_info, | |
1294 | "too many missing devices, writable remount is not allowed"); | |
1295 | return -EACCES; | |
72fa39f5 | 1296 | } |
9ef40c2e JB |
1297 | |
1298 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { | |
1299 | btrfs_warn(fs_info, | |
1300 | "mount required to replay tree-log, cannot remount read-write"); | |
1301 | return -EINVAL; | |
72fa39f5 MT |
1302 | } |
1303 | ||
9ef40c2e JB |
1304 | /* |
1305 | * NOTE: when remounting with a change that does writes, don't put it | |
1306 | * anywhere above this point, as we are not sure to be safe to write | |
1307 | * until we pass the above checks. | |
1308 | */ | |
1309 | ret = btrfs_start_pre_rw_mount(fs_info); | |
1310 | if (ret) | |
1311 | return ret; | |
72fa39f5 | 1312 | |
9ef40c2e JB |
1313 | btrfs_clear_sb_rdonly(fs_info->sb); |
1314 | ||
1315 | set_bit(BTRFS_FS_OPEN, &fs_info->flags); | |
1316 | ||
1317 | /* | |
1318 | * If we've gone from readonly -> read-write, we need to get our | |
1319 | * sync/async discard lists in the right state. | |
1320 | */ | |
1321 | btrfs_discard_resume(fs_info); | |
1322 | ||
1323 | return 0; | |
72fa39f5 | 1324 | } |
312c89fb | 1325 | |
9ef40c2e | 1326 | static int btrfs_remount_ro(struct btrfs_fs_info *fs_info) |
4b82d6e4 | 1327 | { |
9ef40c2e JB |
1328 | /* |
1329 | * This also happens on 'umount -rf' or on shutdown, when the | |
1330 | * filesystem is busy. | |
1331 | */ | |
1332 | cancel_work_sync(&fs_info->async_reclaim_work); | |
1333 | cancel_work_sync(&fs_info->async_data_reclaim_work); | |
4b82d6e4 | 1334 | |
9ef40c2e | 1335 | btrfs_discard_cleanup(fs_info); |
edf24abe | 1336 | |
9ef40c2e JB |
1337 | /* Wait for the uuid_scan task to finish */ |
1338 | down(&fs_info->uuid_tree_rescan_sem); | |
1339 | /* Avoid complains from lockdep et al. */ | |
1340 | up(&fs_info->uuid_tree_rescan_sem); | |
4b82d6e4 | 1341 | |
9ef40c2e | 1342 | btrfs_set_sb_rdonly(fs_info->sb); |
4b82d6e4 | 1343 | |
9ef40c2e JB |
1344 | /* |
1345 | * Setting SB_RDONLY will put the cleaner thread to sleep at the next | |
1346 | * loop if it's already active. If it's already asleep, we'll leave | |
1347 | * unused block groups on disk until we're mounted read-write again | |
1348 | * unless we clean them up here. | |
1349 | */ | |
1350 | btrfs_delete_unused_bgs(fs_info); | |
4b82d6e4 | 1351 | |
9ef40c2e JB |
1352 | /* |
1353 | * The cleaner task could be already running before we set the flag | |
1354 | * BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock). We must make | |
1355 | * sure that after we finish the remount, i.e. after we call | |
1356 | * btrfs_commit_super(), the cleaner can no longer start a transaction | |
1357 | * - either because it was dropping a dead root, running delayed iputs | |
1358 | * or deleting an unused block group (the cleaner picked a block | |
1359 | * group from the list of unused block groups before we were able to | |
1360 | * in the previous call to btrfs_delete_unused_bgs()). | |
1361 | */ | |
1362 | wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING, TASK_UNINTERRUPTIBLE); | |
2e635a27 | 1363 | |
9ef40c2e JB |
1364 | /* |
1365 | * We've set the superblock to RO mode, so we might have made the | |
1366 | * cleaner task sleep without running all pending delayed iputs. Go | |
1367 | * through all the delayed iputs here, so that if an unmount happens | |
1368 | * without remounting RW we don't end up at finishing close_ctree() | |
1369 | * with a non-empty list of delayed iputs. | |
1370 | */ | |
1371 | btrfs_run_delayed_iputs(fs_info); | |
0d2450ab | 1372 | |
9ef40c2e JB |
1373 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
1374 | btrfs_scrub_cancel(fs_info); | |
1375 | btrfs_pause_balance(fs_info); | |
0d2450ab | 1376 | |
9ef40c2e JB |
1377 | /* |
1378 | * Pause the qgroup rescan worker if it is running. We don't want it to | |
1379 | * be still running after we are in RO mode, as after that, by the time | |
1380 | * we unmount, it might have left a transaction open, so we would leak | |
1381 | * the transaction and/or crash. | |
1382 | */ | |
1383 | btrfs_qgroup_wait_for_completion(fs_info, false); | |
0d2450ab | 1384 | |
9ef40c2e JB |
1385 | return btrfs_commit_super(fs_info); |
1386 | } | |
1387 | ||
eddb1a43 JB |
1388 | static void btrfs_ctx_to_info(struct btrfs_fs_info *fs_info, struct btrfs_fs_context *ctx) |
1389 | { | |
1390 | fs_info->max_inline = ctx->max_inline; | |
1391 | fs_info->commit_interval = ctx->commit_interval; | |
1392 | fs_info->metadata_ratio = ctx->metadata_ratio; | |
1393 | fs_info->thread_pool_size = ctx->thread_pool_size; | |
1394 | fs_info->mount_opt = ctx->mount_opt; | |
1395 | fs_info->compress_type = ctx->compress_type; | |
1396 | fs_info->compress_level = ctx->compress_level; | |
0d2450ab ST |
1397 | } |
1398 | ||
eddb1a43 | 1399 | static void btrfs_info_to_ctx(struct btrfs_fs_info *fs_info, struct btrfs_fs_context *ctx) |
f42a34b2 | 1400 | { |
eddb1a43 JB |
1401 | ctx->max_inline = fs_info->max_inline; |
1402 | ctx->commit_interval = fs_info->commit_interval; | |
1403 | ctx->metadata_ratio = fs_info->metadata_ratio; | |
1404 | ctx->thread_pool_size = fs_info->thread_pool_size; | |
1405 | ctx->mount_opt = fs_info->mount_opt; | |
1406 | ctx->compress_type = fs_info->compress_type; | |
1407 | ctx->compress_level = fs_info->compress_level; | |
dc81cdc5 MX |
1408 | } |
1409 | ||
eddb1a43 JB |
1410 | #define btrfs_info_if_set(fs_info, old_ctx, opt, fmt, args...) \ |
1411 | do { \ | |
1412 | if ((!old_ctx || !btrfs_raw_test_opt(old_ctx->mount_opt, opt)) && \ | |
1413 | btrfs_raw_test_opt(fs_info->mount_opt, opt)) \ | |
1414 | btrfs_info(fs_info, fmt, ##args); \ | |
1415 | } while (0) | |
1416 | ||
1417 | #define btrfs_info_if_unset(fs_info, old_ctx, opt, fmt, args...) \ | |
1418 | do { \ | |
1419 | if ((old_ctx && btrfs_raw_test_opt(old_ctx->mount_opt, opt)) && \ | |
1420 | !btrfs_raw_test_opt(fs_info->mount_opt, opt)) \ | |
1421 | btrfs_info(fs_info, fmt, ##args); \ | |
1422 | } while (0) | |
1423 | ||
1424 | static void btrfs_emit_options(struct btrfs_fs_info *info, | |
1425 | struct btrfs_fs_context *old) | |
dc81cdc5 | 1426 | { |
eddb1a43 JB |
1427 | btrfs_info_if_set(info, old, NODATASUM, "setting nodatasum"); |
1428 | btrfs_info_if_set(info, old, DEGRADED, "allowing degraded mounts"); | |
1429 | btrfs_info_if_set(info, old, NODATASUM, "setting nodatasum"); | |
1430 | btrfs_info_if_set(info, old, SSD, "enabling ssd optimizations"); | |
1431 | btrfs_info_if_set(info, old, SSD_SPREAD, "using spread ssd allocation scheme"); | |
1432 | btrfs_info_if_set(info, old, NOBARRIER, "turning off barriers"); | |
1433 | btrfs_info_if_set(info, old, NOTREELOG, "disabling tree log"); | |
1434 | btrfs_info_if_set(info, old, NOLOGREPLAY, "disabling log replay at mount time"); | |
1435 | btrfs_info_if_set(info, old, FLUSHONCOMMIT, "turning on flush-on-commit"); | |
1436 | btrfs_info_if_set(info, old, DISCARD_SYNC, "turning on sync discard"); | |
1437 | btrfs_info_if_set(info, old, DISCARD_ASYNC, "turning on async discard"); | |
1438 | btrfs_info_if_set(info, old, FREE_SPACE_TREE, "enabling free space tree"); | |
1439 | btrfs_info_if_set(info, old, SPACE_CACHE, "enabling disk space caching"); | |
1440 | btrfs_info_if_set(info, old, CLEAR_CACHE, "force clearing of disk cache"); | |
1441 | btrfs_info_if_set(info, old, AUTO_DEFRAG, "enabling auto defrag"); | |
1442 | btrfs_info_if_set(info, old, FRAGMENT_DATA, "fragmenting data"); | |
1443 | btrfs_info_if_set(info, old, FRAGMENT_METADATA, "fragmenting metadata"); | |
1444 | btrfs_info_if_set(info, old, REF_VERIFY, "doing ref verification"); | |
1445 | btrfs_info_if_set(info, old, USEBACKUPROOT, "trying to use backup root at mount time"); | |
1446 | btrfs_info_if_set(info, old, IGNOREBADROOTS, "ignoring bad roots"); | |
1447 | btrfs_info_if_set(info, old, IGNOREDATACSUMS, "ignoring data csums"); | |
169aaaf2 | 1448 | btrfs_info_if_set(info, old, IGNOREMETACSUMS, "ignoring meta csums"); |
32e62165 | 1449 | btrfs_info_if_set(info, old, IGNORESUPERFLAGS, "ignoring unknown super block flags"); |
eddb1a43 JB |
1450 | |
1451 | btrfs_info_if_unset(info, old, NODATACOW, "setting datacow"); | |
1452 | btrfs_info_if_unset(info, old, SSD, "not using ssd optimizations"); | |
1453 | btrfs_info_if_unset(info, old, SSD_SPREAD, "not using spread ssd allocation scheme"); | |
1454 | btrfs_info_if_unset(info, old, NOBARRIER, "turning off barriers"); | |
1455 | btrfs_info_if_unset(info, old, NOTREELOG, "enabling tree log"); | |
1456 | btrfs_info_if_unset(info, old, SPACE_CACHE, "disabling disk space caching"); | |
1457 | btrfs_info_if_unset(info, old, FREE_SPACE_TREE, "disabling free space tree"); | |
1458 | btrfs_info_if_unset(info, old, AUTO_DEFRAG, "disabling auto defrag"); | |
1459 | btrfs_info_if_unset(info, old, COMPRESS, "use no compression"); | |
1460 | ||
1461 | /* Did the compression settings change? */ | |
1462 | if (btrfs_test_opt(info, COMPRESS) && | |
1463 | (!old || | |
1464 | old->compress_type != info->compress_type || | |
1465 | old->compress_level != info->compress_level || | |
1466 | (!btrfs_raw_test_opt(old->mount_opt, FORCE_COMPRESS) && | |
1467 | btrfs_raw_test_opt(info->mount_opt, FORCE_COMPRESS)))) { | |
1468 | const char *compress_type = btrfs_compress_type2str(info->compress_type); | |
1469 | ||
1470 | btrfs_info(info, "%s %s compression, level %d", | |
1471 | btrfs_test_opt(info, FORCE_COMPRESS) ? "force" : "use", | |
1472 | compress_type, info->compress_level); | |
dc81cdc5 MX |
1473 | } |
1474 | ||
eddb1a43 JB |
1475 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
1476 | btrfs_info(info, "max_inline set to %llu", info->max_inline); | |
dc81cdc5 MX |
1477 | } |
1478 | ||
eddb1a43 | 1479 | static int btrfs_reconfigure(struct fs_context *fc) |
c146afad | 1480 | { |
eddb1a43 | 1481 | struct super_block *sb = fc->root->d_sb; |
815745cf | 1482 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
eddb1a43 JB |
1483 | struct btrfs_fs_context *ctx = fc->fs_private; |
1484 | struct btrfs_fs_context old_ctx; | |
1485 | int ret = 0; | |
f044b318 | 1486 | bool mount_reconfigure = (fc->s_fs_info != NULL); |
eddb1a43 JB |
1487 | |
1488 | btrfs_info_to_ctx(fs_info, &old_ctx); | |
c146afad | 1489 | |
2018ef1d JB |
1490 | /* |
1491 | * This is our "bind mount" trick, we don't want to allow the user to do | |
1492 | * anything other than mount a different ro/rw and a different subvol, | |
1493 | * all of the mount options should be maintained. | |
1494 | */ | |
1495 | if (mount_reconfigure) | |
1496 | ctx->mount_opt = old_ctx.mount_opt; | |
1497 | ||
02b9984d | 1498 | sync_filesystem(sb); |
88c4703f | 1499 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
dc81cdc5 | 1500 | |
f044b318 | 1501 | if (!mount_reconfigure && |
ad21f15b | 1502 | !btrfs_check_options(fs_info, &ctx->mount_opt, fc->sb_flags)) |
eddb1a43 | 1503 | return -EINVAL; |
b288052e | 1504 | |
eddb1a43 | 1505 | ret = btrfs_check_features(fs_info, !(fc->sb_flags & SB_RDONLY)); |
d7f67ac9 | 1506 | if (ret < 0) |
eddb1a43 | 1507 | return ret; |
d7f67ac9 | 1508 | |
eddb1a43 JB |
1509 | btrfs_ctx_to_info(fs_info, ctx); |
1510 | btrfs_remount_begin(fs_info, old_ctx.mount_opt, fc->sb_flags); | |
1511 | btrfs_resize_thread_pool(fs_info, fs_info->thread_pool_size, | |
1512 | old_ctx.thread_pool_size); | |
0d2450ab | 1513 | |
c55a4319 BB |
1514 | if ((bool)btrfs_test_opt(fs_info, FREE_SPACE_TREE) != |
1515 | (bool)btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && | |
eddb1a43 | 1516 | (!sb_rdonly(sb) || (fc->sb_flags & SB_RDONLY))) { |
2838d255 | 1517 | btrfs_warn(fs_info, |
eddb1a43 JB |
1518 | "remount supports changing free space tree only from RO to RW"); |
1519 | /* Make sure free space cache options match the state on disk. */ | |
2838d255 BB |
1520 | if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { |
1521 | btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE); | |
1522 | btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE); | |
1523 | } | |
1524 | if (btrfs_free_space_cache_v1_active(fs_info)) { | |
1525 | btrfs_clear_opt(fs_info->mount_opt, FREE_SPACE_TREE); | |
1526 | btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE); | |
1527 | } | |
1528 | } | |
1529 | ||
eddb1a43 JB |
1530 | ret = 0; |
1531 | if (!sb_rdonly(sb) && (fc->sb_flags & SB_RDONLY)) | |
1532 | ret = btrfs_remount_ro(fs_info); | |
1533 | else if (sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY)) | |
1534 | ret = btrfs_remount_rw(fs_info); | |
1535 | if (ret) | |
1536 | goto restore; | |
981a37ba | 1537 | |
faa00889 | 1538 | /* |
eddb1a43 JB |
1539 | * If we set the mask during the parameter parsing VFS would reject the |
1540 | * remount. Here we can set the mask and the value will be updated | |
1541 | * appropriately. | |
faa00889 | 1542 | */ |
eddb1a43 JB |
1543 | if ((fc->sb_flags & SB_POSIXACL) != (sb->s_flags & SB_POSIXACL)) |
1544 | fc->sb_flags_mask |= SB_POSIXACL; | |
faa00889 | 1545 | |
eddb1a43 | 1546 | btrfs_emit_options(fs_info, &old_ctx); |
2c6a92b0 | 1547 | wake_up_process(fs_info->transaction_kthread); |
eddb1a43 | 1548 | btrfs_remount_cleanup(fs_info, old_ctx.mount_opt); |
8cd29088 | 1549 | btrfs_clear_oneshot_options(fs_info); |
88c4703f JT |
1550 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
1551 | ||
c146afad | 1552 | return 0; |
49b25e05 | 1553 | restore: |
eddb1a43 JB |
1554 | btrfs_ctx_to_info(fs_info, &old_ctx); |
1555 | btrfs_remount_cleanup(fs_info, old_ctx.mount_opt); | |
88c4703f | 1556 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
49b25e05 | 1557 | return ret; |
c146afad YZ |
1558 | } |
1559 | ||
bcd53741 | 1560 | /* Used to sort the devices by max_avail(descending sort) */ |
214cc184 | 1561 | static int btrfs_cmp_device_free_bytes(const void *a, const void *b) |
bcd53741 | 1562 | { |
214cc184 DS |
1563 | const struct btrfs_device_info *dev_info1 = a; |
1564 | const struct btrfs_device_info *dev_info2 = b; | |
1565 | ||
1566 | if (dev_info1->max_avail > dev_info2->max_avail) | |
bcd53741 | 1567 | return -1; |
214cc184 | 1568 | else if (dev_info1->max_avail < dev_info2->max_avail) |
bcd53741 | 1569 | return 1; |
bcd53741 AJ |
1570 | return 0; |
1571 | } | |
1572 | ||
1573 | /* | |
1574 | * sort the devices by max_avail, in which max free extent size of each device | |
1575 | * is stored.(Descending Sort) | |
1576 | */ | |
1577 | static inline void btrfs_descending_sort_devices( | |
1578 | struct btrfs_device_info *devices, | |
1579 | size_t nr_devices) | |
1580 | { | |
1581 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), | |
1582 | btrfs_cmp_device_free_bytes, NULL); | |
1583 | } | |
1584 | ||
6d07bcec MX |
1585 | /* |
1586 | * The helper to calc the free space on the devices that can be used to store | |
1587 | * file data. | |
1588 | */ | |
7e17916b AB |
1589 | static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, |
1590 | u64 *free_bytes) | |
6d07bcec | 1591 | { |
6d07bcec MX |
1592 | struct btrfs_device_info *devices_info; |
1593 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
1594 | struct btrfs_device *device; | |
6d07bcec MX |
1595 | u64 type; |
1596 | u64 avail_space; | |
6d07bcec | 1597 | u64 min_stripe_size; |
559ca6ea | 1598 | int num_stripes = 1; |
6d07bcec | 1599 | int i = 0, nr_devices; |
4f080f57 | 1600 | const struct btrfs_raid_attr *rattr; |
6d07bcec | 1601 | |
7e33fd99 | 1602 | /* |
01327610 | 1603 | * We aren't under the device list lock, so this is racy-ish, but good |
7e33fd99 JB |
1604 | * enough for our purposes. |
1605 | */ | |
b772a86e | 1606 | nr_devices = fs_info->fs_devices->open_devices; |
7e33fd99 JB |
1607 | if (!nr_devices) { |
1608 | smp_mb(); | |
1609 | nr_devices = fs_info->fs_devices->open_devices; | |
1610 | ASSERT(nr_devices); | |
1611 | if (!nr_devices) { | |
1612 | *free_bytes = 0; | |
1613 | return 0; | |
1614 | } | |
1615 | } | |
6d07bcec | 1616 | |
d9b0d9ba | 1617 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
6a44517d | 1618 | GFP_KERNEL); |
6d07bcec MX |
1619 | if (!devices_info) |
1620 | return -ENOMEM; | |
1621 | ||
01327610 | 1622 | /* calc min stripe number for data space allocation */ |
1b86826d | 1623 | type = btrfs_data_alloc_profile(fs_info); |
4f080f57 DS |
1624 | rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)]; |
1625 | ||
e1ea2bee | 1626 | if (type & BTRFS_BLOCK_GROUP_RAID0) |
39fb26c3 | 1627 | num_stripes = nr_devices; |
d09cb9e1 DS |
1628 | else if (type & BTRFS_BLOCK_GROUP_RAID1_MASK) |
1629 | num_stripes = rattr->ncopies; | |
e1ea2bee | 1630 | else if (type & BTRFS_BLOCK_GROUP_RAID10) |
39fb26c3 | 1631 | num_stripes = 4; |
6d07bcec | 1632 | |
4f080f57 DS |
1633 | /* Adjust for more than 1 stripe per device */ |
1634 | min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN; | |
6d07bcec | 1635 | |
7e33fd99 JB |
1636 | rcu_read_lock(); |
1637 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { | |
e12c9621 AJ |
1638 | if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, |
1639 | &device->dev_state) || | |
401e29c1 AJ |
1640 | !device->bdev || |
1641 | test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) | |
6d07bcec MX |
1642 | continue; |
1643 | ||
7e33fd99 JB |
1644 | if (i >= nr_devices) |
1645 | break; | |
1646 | ||
6d07bcec MX |
1647 | avail_space = device->total_bytes - device->bytes_used; |
1648 | ||
1649 | /* align with stripe_len */ | |
559ca6ea | 1650 | avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN); |
6d07bcec MX |
1651 | |
1652 | /* | |
37f85ec3 QW |
1653 | * Ensure we have at least min_stripe_size on top of the |
1654 | * reserved space on the device. | |
6d07bcec | 1655 | */ |
37f85ec3 | 1656 | if (avail_space <= BTRFS_DEVICE_RANGE_RESERVED + min_stripe_size) |
6d07bcec MX |
1657 | continue; |
1658 | ||
37f85ec3 | 1659 | avail_space -= BTRFS_DEVICE_RANGE_RESERVED; |
559ca6ea | 1660 | |
6d07bcec MX |
1661 | devices_info[i].dev = device; |
1662 | devices_info[i].max_avail = avail_space; | |
1663 | ||
1664 | i++; | |
1665 | } | |
7e33fd99 | 1666 | rcu_read_unlock(); |
6d07bcec MX |
1667 | |
1668 | nr_devices = i; | |
1669 | ||
1670 | btrfs_descending_sort_devices(devices_info, nr_devices); | |
1671 | ||
1672 | i = nr_devices - 1; | |
1673 | avail_space = 0; | |
559ca6ea NB |
1674 | while (nr_devices >= rattr->devs_min) { |
1675 | num_stripes = min(num_stripes, nr_devices); | |
39fb26c3 | 1676 | |
6d07bcec MX |
1677 | if (devices_info[i].max_avail >= min_stripe_size) { |
1678 | int j; | |
1679 | u64 alloc_size; | |
1680 | ||
39fb26c3 | 1681 | avail_space += devices_info[i].max_avail * num_stripes; |
6d07bcec | 1682 | alloc_size = devices_info[i].max_avail; |
39fb26c3 | 1683 | for (j = i + 1 - num_stripes; j <= i; j++) |
6d07bcec MX |
1684 | devices_info[j].max_avail -= alloc_size; |
1685 | } | |
1686 | i--; | |
1687 | nr_devices--; | |
1688 | } | |
1689 | ||
1690 | kfree(devices_info); | |
1691 | *free_bytes = avail_space; | |
1692 | return 0; | |
1693 | } | |
1694 | ||
ba7b6e62 DS |
1695 | /* |
1696 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. | |
1697 | * | |
1698 | * If there's a redundant raid level at DATA block groups, use the respective | |
1699 | * multiplier to scale the sizes. | |
1700 | * | |
1701 | * Unused device space usage is based on simulating the chunk allocator | |
0d0c71b3 DS |
1702 | * algorithm that respects the device sizes and order of allocations. This is |
1703 | * a close approximation of the actual use but there are other factors that may | |
1704 | * change the result (like a new metadata chunk). | |
ba7b6e62 | 1705 | * |
ca8a51b3 | 1706 | * If metadata is exhausted, f_bavail will be 0. |
ba7b6e62 | 1707 | */ |
8fd17795 CM |
1708 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1709 | { | |
815745cf AV |
1710 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
1711 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
bd4d1088 JB |
1712 | struct btrfs_space_info *found; |
1713 | u64 total_used = 0; | |
6d07bcec | 1714 | u64 total_free_data = 0; |
ca8a51b3 | 1715 | u64 total_free_meta = 0; |
265fdfa6 | 1716 | u32 bits = fs_info->sectorsize_bits; |
de37aa51 | 1717 | __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid; |
ba7b6e62 DS |
1718 | unsigned factor = 1; |
1719 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
6d07bcec | 1720 | int ret; |
ca8a51b3 | 1721 | u64 thresh = 0; |
ae02d1bd | 1722 | int mixed = 0; |
8fd17795 | 1723 | |
72804905 | 1724 | list_for_each_entry(found, &fs_info->space_info, list) { |
6d07bcec | 1725 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
ba7b6e62 DS |
1726 | int i; |
1727 | ||
6d07bcec MX |
1728 | total_free_data += found->disk_total - found->disk_used; |
1729 | total_free_data -= | |
1730 | btrfs_account_ro_block_groups_free_space(found); | |
ba7b6e62 DS |
1731 | |
1732 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
46df06b8 DS |
1733 | if (!list_empty(&found->block_groups[i])) |
1734 | factor = btrfs_bg_type_to_factor( | |
1735 | btrfs_raid_array[i].bg_flag); | |
ba7b6e62 | 1736 | } |
6d07bcec | 1737 | } |
ae02d1bd LB |
1738 | |
1739 | /* | |
67da05b3 | 1740 | * Metadata in mixed block group profiles are accounted in data |
ae02d1bd LB |
1741 | */ |
1742 | if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { | |
1743 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
1744 | mixed = 1; | |
1745 | else | |
1746 | total_free_meta += found->disk_total - | |
1747 | found->disk_used; | |
1748 | } | |
6d07bcec | 1749 | |
b742bb82 | 1750 | total_used += found->disk_used; |
89a55897 | 1751 | } |
ba7b6e62 | 1752 | |
ba7b6e62 DS |
1753 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
1754 | buf->f_blocks >>= bits; | |
1755 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); | |
1756 | ||
1757 | /* Account global block reserve as used, it's in logical size already */ | |
1758 | spin_lock(&block_rsv->lock); | |
41b34acc LB |
1759 | /* Mixed block groups accounting is not byte-accurate, avoid overflow */ |
1760 | if (buf->f_bfree >= block_rsv->size >> bits) | |
1761 | buf->f_bfree -= block_rsv->size >> bits; | |
1762 | else | |
1763 | buf->f_bfree = 0; | |
ba7b6e62 DS |
1764 | spin_unlock(&block_rsv->lock); |
1765 | ||
0d95c1be | 1766 | buf->f_bavail = div_u64(total_free_data, factor); |
6bccf3ab | 1767 | ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); |
7e33fd99 | 1768 | if (ret) |
6d07bcec | 1769 | return ret; |
ba7b6e62 | 1770 | buf->f_bavail += div_u64(total_free_data, factor); |
6d07bcec | 1771 | buf->f_bavail = buf->f_bavail >> bits; |
d397712b | 1772 | |
ca8a51b3 DS |
1773 | /* |
1774 | * We calculate the remaining metadata space minus global reserve. If | |
1775 | * this is (supposedly) smaller than zero, there's no space. But this | |
1776 | * does not hold in practice, the exhausted state happens where's still | |
1777 | * some positive delta. So we apply some guesswork and compare the | |
1778 | * delta to a 4M threshold. (Practically observed delta was ~2M.) | |
1779 | * | |
1780 | * We probably cannot calculate the exact threshold value because this | |
1781 | * depends on the internal reservations requested by various | |
1782 | * operations, so some operations that consume a few metadata will | |
1783 | * succeed even if the Avail is zero. But this is better than the other | |
1784 | * way around. | |
1785 | */ | |
d4417e22 | 1786 | thresh = SZ_4M; |
ca8a51b3 | 1787 | |
d55966c4 JB |
1788 | /* |
1789 | * We only want to claim there's no available space if we can no longer | |
1790 | * allocate chunks for our metadata profile and our global reserve will | |
1791 | * not fit in the free metadata space. If we aren't ->full then we | |
1792 | * still can allocate chunks and thus are fine using the currently | |
1793 | * calculated f_bavail. | |
1794 | */ | |
1795 | if (!mixed && block_rsv->space_info->full && | |
58bfe2cc | 1796 | (total_free_meta < thresh || total_free_meta - thresh < block_rsv->size)) |
ca8a51b3 DS |
1797 | buf->f_bavail = 0; |
1798 | ||
ba7b6e62 | 1799 | buf->f_type = BTRFS_SUPER_MAGIC; |
4e00422e | 1800 | buf->f_bsize = fs_info->sectorsize; |
ba7b6e62 DS |
1801 | buf->f_namelen = BTRFS_NAME_LEN; |
1802 | ||
9d03632e | 1803 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 1804 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
1805 | on a big-endian or little-endian host */ |
1806 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
1807 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 | 1808 | /* Mask in the root object ID too, to disambiguate subvols */ |
e094f480 JB |
1809 | buf->f_fsid.val[0] ^= btrfs_root_id(BTRFS_I(d_inode(dentry))->root) >> 32; |
1810 | buf->f_fsid.val[1] ^= btrfs_root_id(BTRFS_I(d_inode(dentry))->root); | |
32d48fa1 | 1811 | |
8fd17795 CM |
1812 | return 0; |
1813 | } | |
b5133862 | 1814 | |
3bb17a25 JB |
1815 | static int btrfs_fc_test_super(struct super_block *sb, struct fs_context *fc) |
1816 | { | |
1817 | struct btrfs_fs_info *p = fc->s_fs_info; | |
1818 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
1819 | ||
1820 | return fs_info->fs_devices == p->fs_devices; | |
1821 | } | |
1822 | ||
1823 | static int btrfs_get_tree_super(struct fs_context *fc) | |
1824 | { | |
1825 | struct btrfs_fs_info *fs_info = fc->s_fs_info; | |
1826 | struct btrfs_fs_context *ctx = fc->fs_private; | |
1827 | struct btrfs_fs_devices *fs_devices = NULL; | |
1828 | struct block_device *bdev; | |
1829 | struct btrfs_device *device; | |
1830 | struct super_block *sb; | |
affc5af3 | 1831 | blk_mode_t mode = btrfs_open_mode(fc); |
3bb17a25 JB |
1832 | int ret; |
1833 | ||
1834 | btrfs_ctx_to_info(fs_info, ctx); | |
1835 | mutex_lock(&uuid_mutex); | |
1836 | ||
1837 | /* | |
1838 | * With 'true' passed to btrfs_scan_one_device() (mount time) we expect | |
1839 | * either a valid device or an error. | |
1840 | */ | |
1841 | device = btrfs_scan_one_device(fc->source, mode, true); | |
1842 | ASSERT(device != NULL); | |
1843 | if (IS_ERR(device)) { | |
1844 | mutex_unlock(&uuid_mutex); | |
1845 | return PTR_ERR(device); | |
1846 | } | |
1847 | ||
1848 | fs_devices = device->fs_devices; | |
1849 | fs_info->fs_devices = fs_devices; | |
1850 | ||
1851 | ret = btrfs_open_devices(fs_devices, mode, &btrfs_fs_type); | |
1852 | mutex_unlock(&uuid_mutex); | |
1853 | if (ret) | |
1854 | return ret; | |
1855 | ||
1856 | if (!(fc->sb_flags & SB_RDONLY) && fs_devices->rw_devices == 0) { | |
1857 | ret = -EACCES; | |
1858 | goto error; | |
1859 | } | |
1860 | ||
1861 | bdev = fs_devices->latest_dev->bdev; | |
1862 | ||
1863 | /* | |
1864 | * From now on the error handling is not straightforward. | |
1865 | * | |
1866 | * If successful, this will transfer the fs_info into the super block, | |
1867 | * and fc->s_fs_info will be NULL. However if there's an existing | |
1868 | * super, we'll still have fc->s_fs_info populated. If we error | |
1869 | * completely out it'll be cleaned up when we drop the fs_context, | |
1870 | * otherwise it's tied to the lifetime of the super_block. | |
1871 | */ | |
1872 | sb = sget_fc(fc, btrfs_fc_test_super, set_anon_super_fc); | |
1873 | if (IS_ERR(sb)) { | |
1874 | ret = PTR_ERR(sb); | |
1875 | goto error; | |
1876 | } | |
1877 | ||
41d46b29 JB |
1878 | set_device_specific_options(fs_info); |
1879 | ||
3bb17a25 JB |
1880 | if (sb->s_root) { |
1881 | btrfs_close_devices(fs_devices); | |
1882 | if ((fc->sb_flags ^ sb->s_flags) & SB_RDONLY) | |
1883 | ret = -EBUSY; | |
1884 | } else { | |
1885 | snprintf(sb->s_id, sizeof(sb->s_id), "%pg", bdev); | |
1886 | shrinker_debugfs_rename(sb->s_shrink, "sb-btrfs:%s", sb->s_id); | |
1887 | btrfs_sb(sb)->bdev_holder = &btrfs_fs_type; | |
1888 | ret = btrfs_fill_super(sb, fs_devices, NULL); | |
1889 | } | |
1890 | ||
1891 | if (ret) { | |
1892 | deactivate_locked_super(sb); | |
1893 | return ret; | |
1894 | } | |
1895 | ||
83e3a40a JB |
1896 | btrfs_clear_oneshot_options(fs_info); |
1897 | ||
3bb17a25 JB |
1898 | fc->root = dget(sb->s_root); |
1899 | return 0; | |
1900 | ||
1901 | error: | |
1902 | btrfs_close_devices(fs_devices); | |
1903 | return ret; | |
1904 | } | |
1905 | ||
f044b318 JB |
1906 | /* |
1907 | * Ever since commit 0723a0473fb4 ("btrfs: allow mounting btrfs subvolumes | |
1908 | * with different ro/rw options") the following works: | |
1909 | * | |
1910 | * (i) mount /dev/sda3 -o subvol=foo,ro /mnt/foo | |
1911 | * (ii) mount /dev/sda3 -o subvol=bar,rw /mnt/bar | |
1912 | * | |
1913 | * which looks nice and innocent but is actually pretty intricate and deserves | |
1914 | * a long comment. | |
1915 | * | |
1916 | * On another filesystem a subvolume mount is close to something like: | |
1917 | * | |
1918 | * (iii) # create rw superblock + initial mount | |
1919 | * mount -t xfs /dev/sdb /opt/ | |
1920 | * | |
1921 | * # create ro bind mount | |
1922 | * mount --bind -o ro /opt/foo /mnt/foo | |
1923 | * | |
1924 | * # unmount initial mount | |
1925 | * umount /opt | |
1926 | * | |
1927 | * Of course, there's some special subvolume sauce and there's the fact that the | |
1928 | * sb->s_root dentry is really swapped after mount_subtree(). But conceptually | |
1929 | * it's very close and will help us understand the issue. | |
1930 | * | |
1931 | * The old mount API didn't cleanly distinguish between a mount being made ro | |
1932 | * and a superblock being made ro. The only way to change the ro state of | |
1933 | * either object was by passing ms_rdonly. If a new mount was created via | |
1934 | * mount(2) such as: | |
1935 | * | |
1936 | * mount("/dev/sdb", "/mnt", "xfs", ms_rdonly, null); | |
1937 | * | |
1938 | * the MS_RDONLY flag being specified had two effects: | |
1939 | * | |
1940 | * (1) MNT_READONLY was raised -> the resulting mount got | |
1941 | * @mnt->mnt_flags |= MNT_READONLY raised. | |
1942 | * | |
1943 | * (2) MS_RDONLY was passed to the filesystem's mount method and the filesystems | |
1944 | * made the superblock ro. Note, how SB_RDONLY has the same value as | |
1945 | * ms_rdonly and is raised whenever MS_RDONLY is passed through mount(2). | |
1946 | * | |
1947 | * Creating a subtree mount via (iii) ends up leaving a rw superblock with a | |
1948 | * subtree mounted ro. | |
1949 | * | |
1950 | * But consider the effect on the old mount API on btrfs subvolume mounting | |
1951 | * which combines the distinct step in (iii) into a single step. | |
1952 | * | |
1953 | * By issuing (i) both the mount and the superblock are turned ro. Now when (ii) | |
1954 | * is issued the superblock is ro and thus even if the mount created for (ii) is | |
1955 | * rw it wouldn't help. Hence, btrfs needed to transition the superblock from ro | |
1956 | * to rw for (ii) which it did using an internal remount call. | |
1957 | * | |
1958 | * IOW, subvolume mounting was inherently complicated due to the ambiguity of | |
1959 | * MS_RDONLY in mount(2). Note, this ambiguity has mount(8) always translate | |
1960 | * "ro" to MS_RDONLY. IOW, in both (i) and (ii) "ro" becomes MS_RDONLY when | |
1961 | * passed by mount(8) to mount(2). | |
1962 | * | |
1963 | * Enter the new mount API. The new mount API disambiguates making a mount ro | |
1964 | * and making a superblock ro. | |
1965 | * | |
1966 | * (3) To turn a mount ro the MOUNT_ATTR_ONLY flag can be used with either | |
1967 | * fsmount() or mount_setattr() this is a pure VFS level change for a | |
1968 | * specific mount or mount tree that is never seen by the filesystem itself. | |
1969 | * | |
1970 | * (4) To turn a superblock ro the "ro" flag must be used with | |
1971 | * fsconfig(FSCONFIG_SET_FLAG, "ro"). This option is seen by the filesystem | |
1972 | * in fc->sb_flags. | |
1973 | * | |
1974 | * This disambiguation has rather positive consequences. Mounting a subvolume | |
1975 | * ro will not also turn the superblock ro. Only the mount for the subvolume | |
1976 | * will become ro. | |
1977 | * | |
1978 | * So, if the superblock creation request comes from the new mount API the | |
1979 | * caller must have explicitly done: | |
1980 | * | |
1981 | * fsconfig(FSCONFIG_SET_FLAG, "ro") | |
1982 | * fsmount/mount_setattr(MOUNT_ATTR_RDONLY) | |
1983 | * | |
1984 | * IOW, at some point the caller must have explicitly turned the whole | |
1985 | * superblock ro and we shouldn't just undo it like we did for the old mount | |
1986 | * API. In any case, it lets us avoid the hack in the new mount API. | |
1987 | * | |
1988 | * Consequently, the remounting hack must only be used for requests originating | |
1989 | * from the old mount API and should be marked for full deprecation so it can be | |
1990 | * turned off in a couple of years. | |
1991 | * | |
1992 | * The new mount API has no reason to support this hack. | |
1993 | */ | |
1994 | static struct vfsmount *btrfs_reconfigure_for_mount(struct fs_context *fc) | |
1995 | { | |
1996 | struct vfsmount *mnt; | |
1997 | int ret; | |
1998 | const bool ro2rw = !(fc->sb_flags & SB_RDONLY); | |
1999 | ||
2000 | /* | |
2001 | * We got an EBUSY because our SB_RDONLY flag didn't match the existing | |
2002 | * super block, so invert our setting here and retry the mount so we | |
2003 | * can get our vfsmount. | |
2004 | */ | |
2005 | if (ro2rw) | |
2006 | fc->sb_flags |= SB_RDONLY; | |
2007 | else | |
2008 | fc->sb_flags &= ~SB_RDONLY; | |
2009 | ||
2010 | mnt = fc_mount(fc); | |
2011 | if (IS_ERR(mnt)) | |
2012 | return mnt; | |
2013 | ||
2014 | if (!fc->oldapi || !ro2rw) | |
2015 | return mnt; | |
2016 | ||
2017 | /* We need to convert to rw, call reconfigure. */ | |
2018 | fc->sb_flags &= ~SB_RDONLY; | |
2019 | down_write(&mnt->mnt_sb->s_umount); | |
2020 | ret = btrfs_reconfigure(fc); | |
2021 | up_write(&mnt->mnt_sb->s_umount); | |
2022 | if (ret) { | |
2023 | mntput(mnt); | |
2024 | return ERR_PTR(ret); | |
2025 | } | |
2026 | return mnt; | |
2027 | } | |
2028 | ||
3bb17a25 JB |
2029 | static int btrfs_get_tree_subvol(struct fs_context *fc) |
2030 | { | |
2031 | struct btrfs_fs_info *fs_info = NULL; | |
2032 | struct btrfs_fs_context *ctx = fc->fs_private; | |
2033 | struct fs_context *dup_fc; | |
2034 | struct dentry *dentry; | |
2035 | struct vfsmount *mnt; | |
2036 | ||
2037 | /* | |
2038 | * Setup a dummy root and fs_info for test/set super. This is because | |
2039 | * we don't actually fill this stuff out until open_ctree, but we need | |
2040 | * then open_ctree will properly initialize the file system specific | |
2041 | * settings later. btrfs_init_fs_info initializes the static elements | |
2042 | * of the fs_info (locks and such) to make cleanup easier if we find a | |
2043 | * superblock with our given fs_devices later on at sget() time. | |
2044 | */ | |
2045 | fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); | |
2046 | if (!fs_info) | |
2047 | return -ENOMEM; | |
2048 | ||
2049 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); | |
2050 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); | |
2051 | if (!fs_info->super_copy || !fs_info->super_for_commit) { | |
2052 | btrfs_free_fs_info(fs_info); | |
2053 | return -ENOMEM; | |
2054 | } | |
2055 | btrfs_init_fs_info(fs_info); | |
2056 | ||
2057 | dup_fc = vfs_dup_fs_context(fc); | |
2058 | if (IS_ERR(dup_fc)) { | |
2059 | btrfs_free_fs_info(fs_info); | |
2060 | return PTR_ERR(dup_fc); | |
2061 | } | |
2062 | ||
2063 | /* | |
2064 | * When we do the sget_fc this gets transferred to the sb, so we only | |
2065 | * need to set it on the dup_fc as this is what creates the super block. | |
2066 | */ | |
2067 | dup_fc->s_fs_info = fs_info; | |
2068 | ||
2069 | /* | |
2070 | * We'll do the security settings in our btrfs_get_tree_super() mount | |
2071 | * loop, they were duplicated into dup_fc, we can drop the originals | |
2072 | * here. | |
2073 | */ | |
2074 | security_free_mnt_opts(&fc->security); | |
2075 | fc->security = NULL; | |
2076 | ||
2077 | mnt = fc_mount(dup_fc); | |
f044b318 JB |
2078 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) |
2079 | mnt = btrfs_reconfigure_for_mount(dup_fc); | |
3bb17a25 JB |
2080 | put_fs_context(dup_fc); |
2081 | if (IS_ERR(mnt)) | |
2082 | return PTR_ERR(mnt); | |
2083 | ||
2084 | /* | |
2085 | * This free's ->subvol_name, because if it isn't set we have to | |
2086 | * allocate a buffer to hold the subvol_name, so we just drop our | |
2087 | * reference to it here. | |
2088 | */ | |
2089 | dentry = mount_subvol(ctx->subvol_name, ctx->subvol_objectid, mnt); | |
2090 | ctx->subvol_name = NULL; | |
2091 | if (IS_ERR(dentry)) | |
2092 | return PTR_ERR(dentry); | |
2093 | ||
2094 | fc->root = dentry; | |
2095 | return 0; | |
2096 | } | |
2097 | ||
2098 | static int btrfs_get_tree(struct fs_context *fc) | |
2099 | { | |
2100 | /* | |
2101 | * Since we use mount_subtree to mount the default/specified subvol, we | |
2102 | * have to do mounts in two steps. | |
2103 | * | |
2104 | * First pass through we call btrfs_get_tree_subvol(), this is just a | |
2105 | * wrapper around fc_mount() to call back into here again, and this time | |
2106 | * we'll call btrfs_get_tree_super(). This will do the open_ctree() and | |
2107 | * everything to open the devices and file system. Then we return back | |
2108 | * with a fully constructed vfsmount in btrfs_get_tree_subvol(), and | |
2109 | * from there we can do our mount_subvol() call, which will lookup | |
2110 | * whichever subvol we're mounting and setup this fc with the | |
2111 | * appropriate dentry for the subvol. | |
2112 | */ | |
2113 | if (fc->s_fs_info) | |
2114 | return btrfs_get_tree_super(fc); | |
2115 | return btrfs_get_tree_subvol(fc); | |
2116 | } | |
2117 | ||
aea52e19 AV |
2118 | static void btrfs_kill_super(struct super_block *sb) |
2119 | { | |
815745cf | 2120 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
aea52e19 | 2121 | kill_anon_super(sb); |
0d4b0463 | 2122 | btrfs_free_fs_info(fs_info); |
aea52e19 AV |
2123 | } |
2124 | ||
0f85e244 JB |
2125 | static void btrfs_free_fs_context(struct fs_context *fc) |
2126 | { | |
2127 | struct btrfs_fs_context *ctx = fc->fs_private; | |
3bb17a25 | 2128 | struct btrfs_fs_info *fs_info = fc->s_fs_info; |
0f85e244 | 2129 | |
3bb17a25 JB |
2130 | if (fs_info) |
2131 | btrfs_free_fs_info(fs_info); | |
2132 | ||
2133 | if (ctx && refcount_dec_and_test(&ctx->refs)) { | |
2134 | kfree(ctx->subvol_name); | |
2135 | kfree(ctx); | |
2136 | } | |
2137 | } | |
0f85e244 | 2138 | |
3bb17a25 JB |
2139 | static int btrfs_dup_fs_context(struct fs_context *fc, struct fs_context *src_fc) |
2140 | { | |
2141 | struct btrfs_fs_context *ctx = src_fc->fs_private; | |
2142 | ||
2143 | /* | |
2144 | * Give a ref to our ctx to this dup, as we want to keep it around for | |
2145 | * our original fc so we can have the subvolume name or objectid. | |
2146 | * | |
2147 | * We unset ->source in the original fc because the dup needs it for | |
2148 | * mounting, and then once we free the dup it'll free ->source, so we | |
2149 | * need to make sure we're only pointing to it in one fc. | |
2150 | */ | |
2151 | refcount_inc(&ctx->refs); | |
2152 | fc->fs_private = ctx; | |
2153 | fc->source = src_fc->source; | |
2154 | src_fc->source = NULL; | |
2155 | return 0; | |
0f85e244 | 2156 | } |
72fa39f5 | 2157 | |
0f85e244 | 2158 | static const struct fs_context_operations btrfs_fs_context_ops = { |
17b36120 | 2159 | .parse_param = btrfs_parse_param, |
eddb1a43 | 2160 | .reconfigure = btrfs_reconfigure, |
3bb17a25 JB |
2161 | .get_tree = btrfs_get_tree, |
2162 | .dup = btrfs_dup_fs_context, | |
0f85e244 | 2163 | .free = btrfs_free_fs_context, |
72fa39f5 MT |
2164 | }; |
2165 | ||
ad21f15b | 2166 | static int btrfs_init_fs_context(struct fs_context *fc) |
0f85e244 JB |
2167 | { |
2168 | struct btrfs_fs_context *ctx; | |
2169 | ||
2170 | ctx = kzalloc(sizeof(struct btrfs_fs_context), GFP_KERNEL); | |
2171 | if (!ctx) | |
2172 | return -ENOMEM; | |
2173 | ||
3bb17a25 | 2174 | refcount_set(&ctx->refs, 1); |
0f85e244 JB |
2175 | fc->fs_private = ctx; |
2176 | fc->ops = &btrfs_fs_context_ops; | |
2177 | ||
eddb1a43 JB |
2178 | if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { |
2179 | btrfs_info_to_ctx(btrfs_sb(fc->root->d_sb), ctx); | |
2180 | } else { | |
2181 | ctx->thread_pool_size = | |
2182 | min_t(unsigned long, num_online_cpus() + 2, 8); | |
2183 | ctx->max_inline = BTRFS_DEFAULT_MAX_INLINE; | |
2184 | ctx->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
2185 | } | |
2186 | ||
ad21f15b JB |
2187 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
2188 | fc->sb_flags |= SB_POSIXACL; | |
2189 | #endif | |
2190 | fc->sb_flags |= SB_I_VERSION; | |
2191 | ||
0f85e244 JB |
2192 | return 0; |
2193 | } | |
2194 | ||
2e635a27 | 2195 | static struct file_system_type btrfs_fs_type = { |
ad21f15b JB |
2196 | .owner = THIS_MODULE, |
2197 | .name = "btrfs", | |
2198 | .init_fs_context = btrfs_init_fs_context, | |
2199 | .parameters = btrfs_fs_parameters, | |
2200 | .kill_sb = btrfs_kill_super, | |
2201 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP, | |
2202 | }; | |
72fa39f5 | 2203 | |
7f78e035 | 2204 | MODULE_ALIAS_FS("btrfs"); |
a9218f6b | 2205 | |
d8620958 TVB |
2206 | static int btrfs_control_open(struct inode *inode, struct file *file) |
2207 | { | |
2208 | /* | |
2209 | * The control file's private_data is used to hold the | |
2210 | * transaction when it is started and is used to keep | |
2211 | * track of whether a transaction is already in progress. | |
2212 | */ | |
2213 | file->private_data = NULL; | |
2214 | return 0; | |
2215 | } | |
2216 | ||
d352ac68 | 2217 | /* |
cfe953c8 | 2218 | * Used by /dev/btrfs-control for devices ioctls. |
d352ac68 | 2219 | */ |
8a4b83cc CM |
2220 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
2221 | unsigned long arg) | |
2222 | { | |
2223 | struct btrfs_ioctl_vol_args *vol; | |
36350e95 | 2224 | struct btrfs_device *device = NULL; |
16cab91a | 2225 | dev_t devt = 0; |
c071fcfd | 2226 | int ret = -ENOTTY; |
8a4b83cc | 2227 | |
e441d54d CM |
2228 | if (!capable(CAP_SYS_ADMIN)) |
2229 | return -EPERM; | |
2230 | ||
dae7b665 LZ |
2231 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
2232 | if (IS_ERR(vol)) | |
2233 | return PTR_ERR(vol); | |
5ab2b180 DS |
2234 | ret = btrfs_check_ioctl_vol_args_path(vol); |
2235 | if (ret < 0) | |
2236 | goto out; | |
c071fcfd | 2237 | |
8a4b83cc CM |
2238 | switch (cmd) { |
2239 | case BTRFS_IOC_SCAN_DEV: | |
899f9307 | 2240 | mutex_lock(&uuid_mutex); |
bc27d6f0 AJ |
2241 | /* |
2242 | * Scanning outside of mount can return NULL which would turn | |
2243 | * into 0 error code. | |
2244 | */ | |
2245 | device = btrfs_scan_one_device(vol->name, BLK_OPEN_READ, false); | |
36350e95 | 2246 | ret = PTR_ERR_OR_ZERO(device); |
899f9307 | 2247 | mutex_unlock(&uuid_mutex); |
8a4b83cc | 2248 | break; |
228a73ab | 2249 | case BTRFS_IOC_FORGET_DEV: |
16cab91a AJ |
2250 | if (vol->name[0] != 0) { |
2251 | ret = lookup_bdev(vol->name, &devt); | |
2252 | if (ret) | |
2253 | break; | |
2254 | } | |
2255 | ret = btrfs_forget_devices(devt); | |
228a73ab | 2256 | break; |
02db0844 | 2257 | case BTRFS_IOC_DEVICES_READY: |
899f9307 | 2258 | mutex_lock(&uuid_mutex); |
bc27d6f0 AJ |
2259 | /* |
2260 | * Scanning outside of mount can return NULL which would turn | |
2261 | * into 0 error code. | |
2262 | */ | |
2263 | device = btrfs_scan_one_device(vol->name, BLK_OPEN_READ, false); | |
2264 | if (IS_ERR_OR_NULL(device)) { | |
899f9307 | 2265 | mutex_unlock(&uuid_mutex); |
36350e95 | 2266 | ret = PTR_ERR(device); |
02db0844 | 2267 | break; |
899f9307 | 2268 | } |
36350e95 GJ |
2269 | ret = !(device->fs_devices->num_devices == |
2270 | device->fs_devices->total_devices); | |
899f9307 | 2271 | mutex_unlock(&uuid_mutex); |
02db0844 | 2272 | break; |
c5868f83 | 2273 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 2274 | ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
c5868f83 | 2275 | break; |
8a4b83cc | 2276 | } |
dae7b665 | 2277 | |
5ab2b180 | 2278 | out: |
8a4b83cc | 2279 | kfree(vol); |
f819d837 | 2280 | return ret; |
8a4b83cc CM |
2281 | } |
2282 | ||
0176260f | 2283 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b | 2284 | { |
0b246afa | 2285 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
354aa0fb | 2286 | |
fac03c8d | 2287 | set_bit(BTRFS_FS_FROZEN, &fs_info->flags); |
9e7cc91a WX |
2288 | /* |
2289 | * We don't need a barrier here, we'll wait for any transaction that | |
2290 | * could be in progress on other threads (and do delayed iputs that | |
2291 | * we want to avoid on a frozen filesystem), or do the commit | |
2292 | * ourselves. | |
2293 | */ | |
ded980eb | 2294 | return btrfs_commit_current_transaction(fs_info->tree_root); |
ed0dab6b Y |
2295 | } |
2296 | ||
a05d3c91 QW |
2297 | static int check_dev_super(struct btrfs_device *dev) |
2298 | { | |
2299 | struct btrfs_fs_info *fs_info = dev->fs_info; | |
2300 | struct btrfs_super_block *sb; | |
0124855f | 2301 | u64 last_trans; |
3d17adea | 2302 | u16 csum_type; |
a05d3c91 QW |
2303 | int ret = 0; |
2304 | ||
2305 | /* This should be called with fs still frozen. */ | |
2306 | ASSERT(test_bit(BTRFS_FS_FROZEN, &fs_info->flags)); | |
2307 | ||
2308 | /* Missing dev, no need to check. */ | |
2309 | if (!dev->bdev) | |
2310 | return 0; | |
2311 | ||
2312 | /* Only need to check the primary super block. */ | |
2313 | sb = btrfs_read_dev_one_super(dev->bdev, 0, true); | |
2314 | if (IS_ERR(sb)) | |
2315 | return PTR_ERR(sb); | |
2316 | ||
3d17adea QW |
2317 | /* Verify the checksum. */ |
2318 | csum_type = btrfs_super_csum_type(sb); | |
2319 | if (csum_type != btrfs_super_csum_type(fs_info->super_copy)) { | |
2320 | btrfs_err(fs_info, "csum type changed, has %u expect %u", | |
2321 | csum_type, btrfs_super_csum_type(fs_info->super_copy)); | |
2322 | ret = -EUCLEAN; | |
2323 | goto out; | |
2324 | } | |
2325 | ||
2326 | if (btrfs_check_super_csum(fs_info, sb)) { | |
2327 | btrfs_err(fs_info, "csum for on-disk super block no longer matches"); | |
2328 | ret = -EUCLEAN; | |
2329 | goto out; | |
2330 | } | |
2331 | ||
a05d3c91 QW |
2332 | /* Btrfs_validate_super() includes fsid check against super->fsid. */ |
2333 | ret = btrfs_validate_super(fs_info, sb, 0); | |
2334 | if (ret < 0) | |
2335 | goto out; | |
2336 | ||
0124855f FM |
2337 | last_trans = btrfs_get_last_trans_committed(fs_info); |
2338 | if (btrfs_super_generation(sb) != last_trans) { | |
a05d3c91 | 2339 | btrfs_err(fs_info, "transid mismatch, has %llu expect %llu", |
0124855f | 2340 | btrfs_super_generation(sb), last_trans); |
a05d3c91 QW |
2341 | ret = -EUCLEAN; |
2342 | goto out; | |
2343 | } | |
2344 | out: | |
2345 | btrfs_release_disk_super(sb); | |
2346 | return ret; | |
2347 | } | |
2348 | ||
9e7cc91a WX |
2349 | static int btrfs_unfreeze(struct super_block *sb) |
2350 | { | |
fac03c8d | 2351 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
a05d3c91 QW |
2352 | struct btrfs_device *device; |
2353 | int ret = 0; | |
fac03c8d | 2354 | |
a05d3c91 QW |
2355 | /* |
2356 | * Make sure the fs is not changed by accident (like hibernation then | |
2357 | * modified by other OS). | |
2358 | * If we found anything wrong, we mark the fs error immediately. | |
2359 | * | |
2360 | * And since the fs is frozen, no one can modify the fs yet, thus | |
2361 | * we don't need to hold device_list_mutex. | |
2362 | */ | |
2363 | list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { | |
2364 | ret = check_dev_super(device); | |
2365 | if (ret < 0) { | |
2366 | btrfs_handle_fs_error(fs_info, ret, | |
2367 | "super block on devid %llu got modified unexpectedly", | |
2368 | device->devid); | |
2369 | break; | |
2370 | } | |
2371 | } | |
fac03c8d | 2372 | clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); |
a05d3c91 QW |
2373 | |
2374 | /* | |
2375 | * We still return 0, to allow VFS layer to unfreeze the fs even the | |
2376 | * above checks failed. Since the fs is either fine or read-only, we're | |
2377 | * safe to continue, without causing further damage. | |
2378 | */ | |
9e7cc91a WX |
2379 | return 0; |
2380 | } | |
2381 | ||
9c5085c1 JB |
2382 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
2383 | { | |
2384 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); | |
9c5085c1 | 2385 | |
88c14590 | 2386 | /* |
6605fd2f AJ |
2387 | * There should be always a valid pointer in latest_dev, it may be stale |
2388 | * for a short moment in case it's being deleted but still valid until | |
2389 | * the end of RCU grace period. | |
88c14590 DS |
2390 | */ |
2391 | rcu_read_lock(); | |
cb3e217b | 2392 | seq_escape(m, btrfs_dev_name(fs_info->fs_devices->latest_dev), " \t\n\\"); |
88c14590 | 2393 | rcu_read_unlock(); |
6605fd2f | 2394 | |
9c5085c1 JB |
2395 | return 0; |
2396 | } | |
2397 | ||
956a17d9 FM |
2398 | static long btrfs_nr_cached_objects(struct super_block *sb, struct shrink_control *sc) |
2399 | { | |
2400 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
0d89a15e | 2401 | const s64 nr = percpu_counter_sum_positive(&fs_info->evictable_extent_maps); |
956a17d9 | 2402 | |
0d89a15e FM |
2403 | trace_btrfs_extent_map_shrinker_count(fs_info, nr); |
2404 | ||
534f7eff QW |
2405 | /* |
2406 | * Only report the real number for DEBUG builds, as there are reports of | |
2407 | * serious performance degradation caused by too frequent shrinks. | |
2408 | */ | |
2409 | if (IS_ENABLED(CONFIG_BTRFS_DEBUG)) | |
2410 | return nr; | |
2411 | return 0; | |
956a17d9 FM |
2412 | } |
2413 | ||
2414 | static long btrfs_free_cached_objects(struct super_block *sb, struct shrink_control *sc) | |
2415 | { | |
2416 | const long nr_to_scan = min_t(unsigned long, LONG_MAX, sc->nr_to_scan); | |
2417 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
2418 | ||
ae1e766f FM |
2419 | /* |
2420 | * We may be called from any task trying to allocate memory and we don't | |
2421 | * want to slow it down with scanning and dropping extent maps. It would | |
2422 | * also cause heavy lock contention if many tasks concurrently enter | |
2423 | * here. Therefore only allow kswapd tasks to scan and drop extent maps. | |
2424 | */ | |
2425 | if (!current_is_kswapd()) | |
2426 | return 0; | |
2427 | ||
956a17d9 FM |
2428 | return btrfs_free_extent_maps(fs_info, nr_to_scan); |
2429 | } | |
2430 | ||
b87221de | 2431 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 2432 | .drop_inode = btrfs_drop_inode, |
bd555975 | 2433 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 2434 | .put_super = btrfs_put_super, |
d5719762 | 2435 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 2436 | .show_options = btrfs_show_options, |
9c5085c1 | 2437 | .show_devname = btrfs_show_devname, |
2c90e5d6 CM |
2438 | .alloc_inode = btrfs_alloc_inode, |
2439 | .destroy_inode = btrfs_destroy_inode, | |
26602cab | 2440 | .free_inode = btrfs_free_inode, |
8fd17795 | 2441 | .statfs = btrfs_statfs, |
0176260f | 2442 | .freeze_fs = btrfs_freeze, |
9e7cc91a | 2443 | .unfreeze_fs = btrfs_unfreeze, |
956a17d9 FM |
2444 | .nr_cached_objects = btrfs_nr_cached_objects, |
2445 | .free_cached_objects = btrfs_free_cached_objects, | |
e20d96d6 | 2446 | }; |
a9218f6b CM |
2447 | |
2448 | static const struct file_operations btrfs_ctl_fops = { | |
d8620958 | 2449 | .open = btrfs_control_open, |
a9218f6b | 2450 | .unlocked_ioctl = btrfs_control_ioctl, |
1832f2d8 | 2451 | .compat_ioctl = compat_ptr_ioctl, |
a9218f6b | 2452 | .owner = THIS_MODULE, |
6038f373 | 2453 | .llseek = noop_llseek, |
a9218f6b CM |
2454 | }; |
2455 | ||
2456 | static struct miscdevice btrfs_misc = { | |
578454ff | 2457 | .minor = BTRFS_MINOR, |
a9218f6b CM |
2458 | .name = "btrfs-control", |
2459 | .fops = &btrfs_ctl_fops | |
2460 | }; | |
2461 | ||
578454ff KS |
2462 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
2463 | MODULE_ALIAS("devname:btrfs-control"); | |
2464 | ||
f5c29bd9 | 2465 | static int __init btrfs_interface_init(void) |
a9218f6b CM |
2466 | { |
2467 | return misc_register(&btrfs_misc); | |
2468 | } | |
2469 | ||
e67c718b | 2470 | static __cold void btrfs_interface_exit(void) |
a9218f6b | 2471 | { |
f368ed60 | 2472 | misc_deregister(&btrfs_misc); |
a9218f6b CM |
2473 | } |
2474 | ||
5565b8e0 | 2475 | static int __init btrfs_print_mod_info(void) |
85965600 | 2476 | { |
edf57cbf | 2477 | static const char options[] = "" |
85965600 DS |
2478 | #ifdef CONFIG_BTRFS_DEBUG |
2479 | ", debug=on" | |
2480 | #endif | |
79556c3d SB |
2481 | #ifdef CONFIG_BTRFS_ASSERT |
2482 | ", assert=on" | |
2483 | #endif | |
fb592373 JB |
2484 | #ifdef CONFIG_BTRFS_FS_REF_VERIFY |
2485 | ", ref-verify=on" | |
5b316468 NA |
2486 | #endif |
2487 | #ifdef CONFIG_BLK_DEV_ZONED | |
2488 | ", zoned=yes" | |
2489 | #else | |
2490 | ", zoned=no" | |
ea3dc7d2 DS |
2491 | #endif |
2492 | #ifdef CONFIG_FS_VERITY | |
2493 | ", fsverity=yes" | |
2494 | #else | |
2495 | ", fsverity=no" | |
85965600 | 2496 | #endif |
edf57cbf | 2497 | ; |
6e7a367e | 2498 | pr_info("Btrfs loaded%s\n", options); |
5565b8e0 | 2499 | return 0; |
85965600 DS |
2500 | } |
2501 | ||
5565b8e0 | 2502 | static int register_btrfs(void) |
2e635a27 | 2503 | { |
5565b8e0 QW |
2504 | return register_filesystem(&btrfs_fs_type); |
2505 | } | |
97eb6b69 | 2506 | |
5565b8e0 QW |
2507 | static void unregister_btrfs(void) |
2508 | { | |
2509 | unregister_filesystem(&btrfs_fs_type); | |
2510 | } | |
dc11dd5d | 2511 | |
5565b8e0 QW |
2512 | /* Helper structure for long init/exit functions. */ |
2513 | struct init_sequence { | |
2514 | int (*init_func)(void); | |
2515 | /* Can be NULL if the init_func doesn't need cleanup. */ | |
2516 | void (*exit_func)(void); | |
2517 | }; | |
dc11dd5d | 2518 | |
5565b8e0 QW |
2519 | static const struct init_sequence mod_init_seq[] = { |
2520 | { | |
2521 | .init_func = btrfs_props_init, | |
2522 | .exit_func = NULL, | |
2523 | }, { | |
2524 | .init_func = btrfs_init_sysfs, | |
2525 | .exit_func = btrfs_exit_sysfs, | |
2526 | }, { | |
2527 | .init_func = btrfs_init_compress, | |
2528 | .exit_func = btrfs_exit_compress, | |
2529 | }, { | |
2530 | .init_func = btrfs_init_cachep, | |
2531 | .exit_func = btrfs_destroy_cachep, | |
9aa29a20 FM |
2532 | }, { |
2533 | .init_func = btrfs_init_dio, | |
2534 | .exit_func = btrfs_destroy_dio, | |
5565b8e0 QW |
2535 | }, { |
2536 | .init_func = btrfs_transaction_init, | |
2537 | .exit_func = btrfs_transaction_exit, | |
2538 | }, { | |
2539 | .init_func = btrfs_ctree_init, | |
2540 | .exit_func = btrfs_ctree_exit, | |
2541 | }, { | |
2542 | .init_func = btrfs_free_space_init, | |
2543 | .exit_func = btrfs_free_space_exit, | |
2544 | }, { | |
2545 | .init_func = extent_state_init_cachep, | |
2546 | .exit_func = extent_state_free_cachep, | |
2547 | }, { | |
2548 | .init_func = extent_buffer_init_cachep, | |
2549 | .exit_func = extent_buffer_free_cachep, | |
2550 | }, { | |
2551 | .init_func = btrfs_bioset_init, | |
2552 | .exit_func = btrfs_bioset_exit, | |
2553 | }, { | |
2554 | .init_func = extent_map_init, | |
2555 | .exit_func = extent_map_exit, | |
2556 | }, { | |
2557 | .init_func = ordered_data_init, | |
2558 | .exit_func = ordered_data_exit, | |
2559 | }, { | |
2560 | .init_func = btrfs_delayed_inode_init, | |
2561 | .exit_func = btrfs_delayed_inode_exit, | |
2562 | }, { | |
2563 | .init_func = btrfs_auto_defrag_init, | |
2564 | .exit_func = btrfs_auto_defrag_exit, | |
2565 | }, { | |
2566 | .init_func = btrfs_delayed_ref_init, | |
2567 | .exit_func = btrfs_delayed_ref_exit, | |
2568 | }, { | |
2569 | .init_func = btrfs_prelim_ref_init, | |
2570 | .exit_func = btrfs_prelim_ref_exit, | |
2571 | }, { | |
2572 | .init_func = btrfs_interface_init, | |
2573 | .exit_func = btrfs_interface_exit, | |
2574 | }, { | |
2575 | .init_func = btrfs_print_mod_info, | |
2576 | .exit_func = NULL, | |
2577 | }, { | |
2578 | .init_func = btrfs_run_sanity_tests, | |
2579 | .exit_func = NULL, | |
2580 | }, { | |
2581 | .init_func = register_btrfs, | |
2582 | .exit_func = unregister_btrfs, | |
2583 | } | |
2584 | }; | |
74255aa0 | 2585 | |
5565b8e0 | 2586 | static bool mod_init_result[ARRAY_SIZE(mod_init_seq)]; |
2f4cbe64 | 2587 | |
82c0efd3 | 2588 | static __always_inline void btrfs_exit_btrfs_fs(void) |
5565b8e0 QW |
2589 | { |
2590 | int i; | |
9678c543 | 2591 | |
5565b8e0 QW |
2592 | for (i = ARRAY_SIZE(mod_init_seq) - 1; i >= 0; i--) { |
2593 | if (!mod_init_result[i]) | |
2594 | continue; | |
2595 | if (mod_init_seq[i].exit_func) | |
2596 | mod_init_seq[i].exit_func(); | |
2597 | mod_init_result[i] = false; | |
2598 | } | |
2e635a27 CM |
2599 | } |
2600 | ||
82c0efd3 AJ |
2601 | static void __exit exit_btrfs_fs(void) |
2602 | { | |
2603 | btrfs_exit_btrfs_fs(); | |
c68f7290 | 2604 | btrfs_cleanup_fs_uuids(); |
82c0efd3 AJ |
2605 | } |
2606 | ||
5565b8e0 | 2607 | static int __init init_btrfs_fs(void) |
2e635a27 | 2608 | { |
5565b8e0 QW |
2609 | int ret; |
2610 | int i; | |
2611 | ||
2612 | for (i = 0; i < ARRAY_SIZE(mod_init_seq); i++) { | |
2613 | ASSERT(!mod_init_result[i]); | |
2614 | ret = mod_init_seq[i].init_func(); | |
82c0efd3 AJ |
2615 | if (ret < 0) { |
2616 | btrfs_exit_btrfs_fs(); | |
2617 | return ret; | |
2618 | } | |
5565b8e0 QW |
2619 | mod_init_result[i] = true; |
2620 | } | |
2621 | return 0; | |
2e635a27 CM |
2622 | } |
2623 | ||
60efa5eb | 2624 | late_initcall(init_btrfs_fs); |
2e635a27 CM |
2625 | module_exit(exit_btrfs_fs) |
2626 | ||
95359f63 | 2627 | MODULE_DESCRIPTION("B-Tree File System (BTRFS)"); |
2e635a27 | 2628 | MODULE_LICENSE("GPL"); |
d5178578 | 2629 | MODULE_SOFTDEP("pre: crc32c"); |
3951e7f0 | 2630 | MODULE_SOFTDEP("pre: xxhash64"); |
3831bf00 | 2631 | MODULE_SOFTDEP("pre: sha256"); |
352ae07b | 2632 | MODULE_SOFTDEP("pre: blake2b-256"); |