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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | /* | |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
4 | */ | |
5 | ||
6 | #include <linux/sched.h> | |
7 | #include <linux/sched/mm.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/completion.h> | |
11 | #include <linux/bug.h> | |
12 | #include <crypto/hash.h> | |
13 | ||
14 | #include "ctree.h" | |
15 | #include "discard.h" | |
16 | #include "disk-io.h" | |
17 | #include "transaction.h" | |
18 | #include "sysfs.h" | |
19 | #include "volumes.h" | |
20 | #include "space-info.h" | |
21 | #include "block-group.h" | |
22 | ||
23 | struct btrfs_feature_attr { | |
24 | struct kobj_attribute kobj_attr; | |
25 | enum btrfs_feature_set feature_set; | |
26 | u64 feature_bit; | |
27 | }; | |
28 | ||
29 | /* For raid type sysfs entries */ | |
30 | struct raid_kobject { | |
31 | u64 flags; | |
32 | struct kobject kobj; | |
33 | }; | |
34 | ||
35 | #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ | |
36 | { \ | |
37 | .attr = { .name = __stringify(_name), .mode = _mode }, \ | |
38 | .show = _show, \ | |
39 | .store = _store, \ | |
40 | } | |
41 | ||
42 | #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ | |
43 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
44 | __INIT_KOBJ_ATTR(_name, 0644, _show, _store) | |
45 | ||
46 | #define BTRFS_ATTR(_prefix, _name, _show) \ | |
47 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
48 | __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) | |
49 | ||
50 | #define BTRFS_ATTR_PTR(_prefix, _name) \ | |
51 | (&btrfs_attr_##_prefix##_##_name.attr) | |
52 | ||
53 | #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ | |
54 | static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ | |
55 | .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ | |
56 | btrfs_feature_attr_show, \ | |
57 | btrfs_feature_attr_store), \ | |
58 | .feature_set = _feature_set, \ | |
59 | .feature_bit = _feature_prefix ##_## _feature_bit, \ | |
60 | } | |
61 | #define BTRFS_FEAT_ATTR_PTR(_name) \ | |
62 | (&btrfs_attr_features_##_name.kobj_attr.attr) | |
63 | ||
64 | #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ | |
65 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) | |
66 | #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ | |
67 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) | |
68 | #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ | |
69 | BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) | |
70 | ||
71 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); | |
72 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); | |
73 | ||
74 | static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) | |
75 | { | |
76 | return container_of(a, struct btrfs_feature_attr, kobj_attr); | |
77 | } | |
78 | ||
79 | static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) | |
80 | { | |
81 | return container_of(attr, struct kobj_attribute, attr); | |
82 | } | |
83 | ||
84 | static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( | |
85 | struct attribute *attr) | |
86 | { | |
87 | return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); | |
88 | } | |
89 | ||
90 | static u64 get_features(struct btrfs_fs_info *fs_info, | |
91 | enum btrfs_feature_set set) | |
92 | { | |
93 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
94 | if (set == FEAT_COMPAT) | |
95 | return btrfs_super_compat_flags(disk_super); | |
96 | else if (set == FEAT_COMPAT_RO) | |
97 | return btrfs_super_compat_ro_flags(disk_super); | |
98 | else | |
99 | return btrfs_super_incompat_flags(disk_super); | |
100 | } | |
101 | ||
102 | static void set_features(struct btrfs_fs_info *fs_info, | |
103 | enum btrfs_feature_set set, u64 features) | |
104 | { | |
105 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
106 | if (set == FEAT_COMPAT) | |
107 | btrfs_set_super_compat_flags(disk_super, features); | |
108 | else if (set == FEAT_COMPAT_RO) | |
109 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
110 | else | |
111 | btrfs_set_super_incompat_flags(disk_super, features); | |
112 | } | |
113 | ||
114 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
115 | { | |
116 | int val = 0; | |
117 | u64 set, clear; | |
118 | switch (fa->feature_set) { | |
119 | case FEAT_COMPAT: | |
120 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
121 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
122 | break; | |
123 | case FEAT_COMPAT_RO: | |
124 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
125 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
126 | break; | |
127 | case FEAT_INCOMPAT: | |
128 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
129 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
130 | break; | |
131 | default: | |
132 | pr_warn("btrfs: sysfs: unknown feature set %d\n", | |
133 | fa->feature_set); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | if (set & fa->feature_bit) | |
138 | val |= 1; | |
139 | if (clear & fa->feature_bit) | |
140 | val |= 2; | |
141 | ||
142 | return val; | |
143 | } | |
144 | ||
145 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, | |
146 | struct kobj_attribute *a, char *buf) | |
147 | { | |
148 | int val = 0; | |
149 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
150 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
151 | if (fs_info) { | |
152 | u64 features = get_features(fs_info, fa->feature_set); | |
153 | if (features & fa->feature_bit) | |
154 | val = 1; | |
155 | } else | |
156 | val = can_modify_feature(fa); | |
157 | ||
158 | return snprintf(buf, PAGE_SIZE, "%d\n", val); | |
159 | } | |
160 | ||
161 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, | |
162 | struct kobj_attribute *a, | |
163 | const char *buf, size_t count) | |
164 | { | |
165 | struct btrfs_fs_info *fs_info; | |
166 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
167 | u64 features, set, clear; | |
168 | unsigned long val; | |
169 | int ret; | |
170 | ||
171 | fs_info = to_fs_info(kobj); | |
172 | if (!fs_info) | |
173 | return -EPERM; | |
174 | ||
175 | if (sb_rdonly(fs_info->sb)) | |
176 | return -EROFS; | |
177 | ||
178 | ret = kstrtoul(skip_spaces(buf), 0, &val); | |
179 | if (ret) | |
180 | return ret; | |
181 | ||
182 | if (fa->feature_set == FEAT_COMPAT) { | |
183 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
184 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
185 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
186 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
187 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
188 | } else { | |
189 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
190 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
191 | } | |
192 | ||
193 | features = get_features(fs_info, fa->feature_set); | |
194 | ||
195 | /* Nothing to do */ | |
196 | if ((val && (features & fa->feature_bit)) || | |
197 | (!val && !(features & fa->feature_bit))) | |
198 | return count; | |
199 | ||
200 | if ((val && !(set & fa->feature_bit)) || | |
201 | (!val && !(clear & fa->feature_bit))) { | |
202 | btrfs_info(fs_info, | |
203 | "%sabling feature %s on mounted fs is not supported.", | |
204 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
205 | return -EPERM; | |
206 | } | |
207 | ||
208 | btrfs_info(fs_info, "%s %s feature flag", | |
209 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
210 | ||
211 | spin_lock(&fs_info->super_lock); | |
212 | features = get_features(fs_info, fa->feature_set); | |
213 | if (val) | |
214 | features |= fa->feature_bit; | |
215 | else | |
216 | features &= ~fa->feature_bit; | |
217 | set_features(fs_info, fa->feature_set, features); | |
218 | spin_unlock(&fs_info->super_lock); | |
219 | ||
220 | /* | |
221 | * We don't want to do full transaction commit from inside sysfs | |
222 | */ | |
223 | btrfs_set_pending(fs_info, COMMIT); | |
224 | wake_up_process(fs_info->transaction_kthread); | |
225 | ||
226 | return count; | |
227 | } | |
228 | ||
229 | static umode_t btrfs_feature_visible(struct kobject *kobj, | |
230 | struct attribute *attr, int unused) | |
231 | { | |
232 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
233 | umode_t mode = attr->mode; | |
234 | ||
235 | if (fs_info) { | |
236 | struct btrfs_feature_attr *fa; | |
237 | u64 features; | |
238 | ||
239 | fa = attr_to_btrfs_feature_attr(attr); | |
240 | features = get_features(fs_info, fa->feature_set); | |
241 | ||
242 | if (can_modify_feature(fa)) | |
243 | mode |= S_IWUSR; | |
244 | else if (!(features & fa->feature_bit)) | |
245 | mode = 0; | |
246 | } | |
247 | ||
248 | return mode; | |
249 | } | |
250 | ||
251 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
252 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
253 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
254 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
255 | BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); | |
256 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); | |
257 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
258 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
259 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
260 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); | |
261 | BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); | |
262 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); | |
263 | BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); | |
264 | ||
265 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
266 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
267 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
268 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
269 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
270 | BTRFS_FEAT_ATTR_PTR(compress_zstd), | |
271 | BTRFS_FEAT_ATTR_PTR(big_metadata), | |
272 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
273 | BTRFS_FEAT_ATTR_PTR(raid56), | |
274 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
275 | BTRFS_FEAT_ATTR_PTR(no_holes), | |
276 | BTRFS_FEAT_ATTR_PTR(metadata_uuid), | |
277 | BTRFS_FEAT_ATTR_PTR(free_space_tree), | |
278 | BTRFS_FEAT_ATTR_PTR(raid1c34), | |
279 | NULL | |
280 | }; | |
281 | ||
282 | /* | |
283 | * Features which depend on feature bits and may differ between each fs. | |
284 | * | |
285 | * /sys/fs/btrfs/features lists all available features of this kernel while | |
286 | * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or | |
287 | * can be changed online. | |
288 | */ | |
289 | static const struct attribute_group btrfs_feature_attr_group = { | |
290 | .name = "features", | |
291 | .is_visible = btrfs_feature_visible, | |
292 | .attrs = btrfs_supported_feature_attrs, | |
293 | }; | |
294 | ||
295 | static ssize_t rmdir_subvol_show(struct kobject *kobj, | |
296 | struct kobj_attribute *ka, char *buf) | |
297 | { | |
298 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
299 | } | |
300 | BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); | |
301 | ||
302 | static ssize_t supported_checksums_show(struct kobject *kobj, | |
303 | struct kobj_attribute *a, char *buf) | |
304 | { | |
305 | ssize_t ret = 0; | |
306 | int i; | |
307 | ||
308 | for (i = 0; i < btrfs_get_num_csums(); i++) { | |
309 | /* | |
310 | * This "trick" only works as long as 'enum btrfs_csum_type' has | |
311 | * no holes in it | |
312 | */ | |
313 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s", | |
314 | (i == 0 ? "" : " "), btrfs_super_csum_name(i)); | |
315 | ||
316 | } | |
317 | ||
318 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); | |
319 | return ret; | |
320 | } | |
321 | BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); | |
322 | ||
323 | static struct attribute *btrfs_supported_static_feature_attrs[] = { | |
324 | BTRFS_ATTR_PTR(static_feature, rmdir_subvol), | |
325 | BTRFS_ATTR_PTR(static_feature, supported_checksums), | |
326 | NULL | |
327 | }; | |
328 | ||
329 | /* | |
330 | * Features which only depend on kernel version. | |
331 | * | |
332 | * These are listed in /sys/fs/btrfs/features along with | |
333 | * btrfs_feature_attr_group | |
334 | */ | |
335 | static const struct attribute_group btrfs_static_feature_attr_group = { | |
336 | .name = "features", | |
337 | .attrs = btrfs_supported_static_feature_attrs, | |
338 | }; | |
339 | ||
340 | #ifdef CONFIG_BTRFS_DEBUG | |
341 | ||
342 | /* | |
343 | * Discard statistics and tunables | |
344 | */ | |
345 | #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent) | |
346 | ||
347 | static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, | |
348 | struct kobj_attribute *a, | |
349 | char *buf) | |
350 | { | |
351 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
352 | ||
353 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
354 | atomic_read(&fs_info->discard_ctl.discardable_extents)); | |
355 | } | |
356 | BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); | |
357 | ||
358 | static const struct attribute *discard_debug_attrs[] = { | |
359 | BTRFS_ATTR_PTR(discard, discardable_extents), | |
360 | NULL, | |
361 | }; | |
362 | ||
363 | /* | |
364 | * Runtime debugging exported via sysfs | |
365 | * | |
366 | * /sys/fs/btrfs/debug - applies to module or all filesystems | |
367 | * /sys/fs/btrfs/UUID - applies only to the given filesystem | |
368 | */ | |
369 | static const struct attribute *btrfs_debug_mount_attrs[] = { | |
370 | NULL, | |
371 | }; | |
372 | ||
373 | static struct attribute *btrfs_debug_feature_attrs[] = { | |
374 | NULL | |
375 | }; | |
376 | ||
377 | static const struct attribute_group btrfs_debug_feature_attr_group = { | |
378 | .name = "debug", | |
379 | .attrs = btrfs_debug_feature_attrs, | |
380 | }; | |
381 | ||
382 | #endif | |
383 | ||
384 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) | |
385 | { | |
386 | u64 val; | |
387 | if (lock) | |
388 | spin_lock(lock); | |
389 | val = *value_ptr; | |
390 | if (lock) | |
391 | spin_unlock(lock); | |
392 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
393 | } | |
394 | ||
395 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
396 | struct kobj_attribute *ka, char *buf) | |
397 | { | |
398 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
399 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
400 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
401 | } | |
402 | BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); | |
403 | ||
404 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
405 | struct kobj_attribute *a, char *buf) | |
406 | { | |
407 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
408 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
409 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
410 | } | |
411 | BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); | |
412 | ||
413 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
414 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) | |
415 | ||
416 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
417 | struct kobj_attribute *attr, char *buf); | |
418 | BTRFS_ATTR(raid, total_bytes, raid_bytes_show); | |
419 | BTRFS_ATTR(raid, used_bytes, raid_bytes_show); | |
420 | ||
421 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
422 | struct kobj_attribute *attr, char *buf) | |
423 | ||
424 | { | |
425 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
426 | struct btrfs_block_group *block_group; | |
427 | int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); | |
428 | u64 val = 0; | |
429 | ||
430 | down_read(&sinfo->groups_sem); | |
431 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
432 | if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) | |
433 | val += block_group->length; | |
434 | else | |
435 | val += block_group->used; | |
436 | } | |
437 | up_read(&sinfo->groups_sem); | |
438 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
439 | } | |
440 | ||
441 | static struct attribute *raid_attrs[] = { | |
442 | BTRFS_ATTR_PTR(raid, total_bytes), | |
443 | BTRFS_ATTR_PTR(raid, used_bytes), | |
444 | NULL | |
445 | }; | |
446 | ATTRIBUTE_GROUPS(raid); | |
447 | ||
448 | static void release_raid_kobj(struct kobject *kobj) | |
449 | { | |
450 | kfree(to_raid_kobj(kobj)); | |
451 | } | |
452 | ||
453 | static struct kobj_type btrfs_raid_ktype = { | |
454 | .sysfs_ops = &kobj_sysfs_ops, | |
455 | .release = release_raid_kobj, | |
456 | .default_groups = raid_groups, | |
457 | }; | |
458 | ||
459 | #define SPACE_INFO_ATTR(field) \ | |
460 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
461 | struct kobj_attribute *a, \ | |
462 | char *buf) \ | |
463 | { \ | |
464 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
465 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
466 | } \ | |
467 | BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) | |
468 | ||
469 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
470 | struct kobj_attribute *a, | |
471 | char *buf) | |
472 | { | |
473 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
474 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
475 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
476 | } | |
477 | ||
478 | SPACE_INFO_ATTR(flags); | |
479 | SPACE_INFO_ATTR(total_bytes); | |
480 | SPACE_INFO_ATTR(bytes_used); | |
481 | SPACE_INFO_ATTR(bytes_pinned); | |
482 | SPACE_INFO_ATTR(bytes_reserved); | |
483 | SPACE_INFO_ATTR(bytes_may_use); | |
484 | SPACE_INFO_ATTR(bytes_readonly); | |
485 | SPACE_INFO_ATTR(disk_used); | |
486 | SPACE_INFO_ATTR(disk_total); | |
487 | BTRFS_ATTR(space_info, total_bytes_pinned, | |
488 | btrfs_space_info_show_total_bytes_pinned); | |
489 | ||
490 | static struct attribute *space_info_attrs[] = { | |
491 | BTRFS_ATTR_PTR(space_info, flags), | |
492 | BTRFS_ATTR_PTR(space_info, total_bytes), | |
493 | BTRFS_ATTR_PTR(space_info, bytes_used), | |
494 | BTRFS_ATTR_PTR(space_info, bytes_pinned), | |
495 | BTRFS_ATTR_PTR(space_info, bytes_reserved), | |
496 | BTRFS_ATTR_PTR(space_info, bytes_may_use), | |
497 | BTRFS_ATTR_PTR(space_info, bytes_readonly), | |
498 | BTRFS_ATTR_PTR(space_info, disk_used), | |
499 | BTRFS_ATTR_PTR(space_info, disk_total), | |
500 | BTRFS_ATTR_PTR(space_info, total_bytes_pinned), | |
501 | NULL, | |
502 | }; | |
503 | ATTRIBUTE_GROUPS(space_info); | |
504 | ||
505 | static void space_info_release(struct kobject *kobj) | |
506 | { | |
507 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
508 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
509 | kfree(sinfo); | |
510 | } | |
511 | ||
512 | static struct kobj_type space_info_ktype = { | |
513 | .sysfs_ops = &kobj_sysfs_ops, | |
514 | .release = space_info_release, | |
515 | .default_groups = space_info_groups, | |
516 | }; | |
517 | ||
518 | static const struct attribute *allocation_attrs[] = { | |
519 | BTRFS_ATTR_PTR(allocation, global_rsv_reserved), | |
520 | BTRFS_ATTR_PTR(allocation, global_rsv_size), | |
521 | NULL, | |
522 | }; | |
523 | ||
524 | static ssize_t btrfs_label_show(struct kobject *kobj, | |
525 | struct kobj_attribute *a, char *buf) | |
526 | { | |
527 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
528 | char *label = fs_info->super_copy->label; | |
529 | ssize_t ret; | |
530 | ||
531 | spin_lock(&fs_info->super_lock); | |
532 | ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); | |
533 | spin_unlock(&fs_info->super_lock); | |
534 | ||
535 | return ret; | |
536 | } | |
537 | ||
538 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
539 | struct kobj_attribute *a, | |
540 | const char *buf, size_t len) | |
541 | { | |
542 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
543 | size_t p_len; | |
544 | ||
545 | if (!fs_info) | |
546 | return -EPERM; | |
547 | ||
548 | if (sb_rdonly(fs_info->sb)) | |
549 | return -EROFS; | |
550 | ||
551 | /* | |
552 | * p_len is the len until the first occurrence of either | |
553 | * '\n' or '\0' | |
554 | */ | |
555 | p_len = strcspn(buf, "\n"); | |
556 | ||
557 | if (p_len >= BTRFS_LABEL_SIZE) | |
558 | return -EINVAL; | |
559 | ||
560 | spin_lock(&fs_info->super_lock); | |
561 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); | |
562 | memcpy(fs_info->super_copy->label, buf, p_len); | |
563 | spin_unlock(&fs_info->super_lock); | |
564 | ||
565 | /* | |
566 | * We don't want to do full transaction commit from inside sysfs | |
567 | */ | |
568 | btrfs_set_pending(fs_info, COMMIT); | |
569 | wake_up_process(fs_info->transaction_kthread); | |
570 | ||
571 | return len; | |
572 | } | |
573 | BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); | |
574 | ||
575 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, | |
576 | struct kobj_attribute *a, char *buf) | |
577 | { | |
578 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
579 | ||
580 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); | |
581 | } | |
582 | ||
583 | BTRFS_ATTR(, nodesize, btrfs_nodesize_show); | |
584 | ||
585 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
586 | struct kobj_attribute *a, char *buf) | |
587 | { | |
588 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
589 | ||
590 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
591 | fs_info->super_copy->sectorsize); | |
592 | } | |
593 | ||
594 | BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); | |
595 | ||
596 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
597 | struct kobj_attribute *a, char *buf) | |
598 | { | |
599 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
600 | ||
601 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
602 | fs_info->super_copy->sectorsize); | |
603 | } | |
604 | ||
605 | BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); | |
606 | ||
607 | static ssize_t quota_override_show(struct kobject *kobj, | |
608 | struct kobj_attribute *a, char *buf) | |
609 | { | |
610 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
611 | int quota_override; | |
612 | ||
613 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
614 | return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); | |
615 | } | |
616 | ||
617 | static ssize_t quota_override_store(struct kobject *kobj, | |
618 | struct kobj_attribute *a, | |
619 | const char *buf, size_t len) | |
620 | { | |
621 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
622 | unsigned long knob; | |
623 | int err; | |
624 | ||
625 | if (!fs_info) | |
626 | return -EPERM; | |
627 | ||
628 | if (!capable(CAP_SYS_RESOURCE)) | |
629 | return -EPERM; | |
630 | ||
631 | err = kstrtoul(buf, 10, &knob); | |
632 | if (err) | |
633 | return err; | |
634 | if (knob > 1) | |
635 | return -EINVAL; | |
636 | ||
637 | if (knob) | |
638 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
639 | else | |
640 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
641 | ||
642 | return len; | |
643 | } | |
644 | ||
645 | BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); | |
646 | ||
647 | static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, | |
648 | struct kobj_attribute *a, char *buf) | |
649 | { | |
650 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
651 | ||
652 | return snprintf(buf, PAGE_SIZE, "%pU\n", | |
653 | fs_info->fs_devices->metadata_uuid); | |
654 | } | |
655 | ||
656 | BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); | |
657 | ||
658 | static ssize_t btrfs_checksum_show(struct kobject *kobj, | |
659 | struct kobj_attribute *a, char *buf) | |
660 | { | |
661 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
662 | u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
663 | ||
664 | return snprintf(buf, PAGE_SIZE, "%s (%s)\n", | |
665 | btrfs_super_csum_name(csum_type), | |
666 | crypto_shash_driver_name(fs_info->csum_shash)); | |
667 | } | |
668 | ||
669 | BTRFS_ATTR(, checksum, btrfs_checksum_show); | |
670 | ||
671 | static const struct attribute *btrfs_attrs[] = { | |
672 | BTRFS_ATTR_PTR(, label), | |
673 | BTRFS_ATTR_PTR(, nodesize), | |
674 | BTRFS_ATTR_PTR(, sectorsize), | |
675 | BTRFS_ATTR_PTR(, clone_alignment), | |
676 | BTRFS_ATTR_PTR(, quota_override), | |
677 | BTRFS_ATTR_PTR(, metadata_uuid), | |
678 | BTRFS_ATTR_PTR(, checksum), | |
679 | NULL, | |
680 | }; | |
681 | ||
682 | static void btrfs_release_fsid_kobj(struct kobject *kobj) | |
683 | { | |
684 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); | |
685 | ||
686 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); | |
687 | complete(&fs_devs->kobj_unregister); | |
688 | } | |
689 | ||
690 | static struct kobj_type btrfs_ktype = { | |
691 | .sysfs_ops = &kobj_sysfs_ops, | |
692 | .release = btrfs_release_fsid_kobj, | |
693 | }; | |
694 | ||
695 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) | |
696 | { | |
697 | if (kobj->ktype != &btrfs_ktype) | |
698 | return NULL; | |
699 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); | |
700 | } | |
701 | ||
702 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) | |
703 | { | |
704 | if (kobj->ktype != &btrfs_ktype) | |
705 | return NULL; | |
706 | return to_fs_devs(kobj)->fs_info; | |
707 | } | |
708 | ||
709 | #define NUM_FEATURE_BITS 64 | |
710 | #define BTRFS_FEATURE_NAME_MAX 13 | |
711 | static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; | |
712 | static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; | |
713 | ||
714 | static const u64 supported_feature_masks[FEAT_MAX] = { | |
715 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, | |
716 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
717 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
718 | }; | |
719 | ||
720 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
721 | { | |
722 | int set; | |
723 | ||
724 | for (set = 0; set < FEAT_MAX; set++) { | |
725 | int i; | |
726 | struct attribute *attrs[2]; | |
727 | struct attribute_group agroup = { | |
728 | .name = "features", | |
729 | .attrs = attrs, | |
730 | }; | |
731 | u64 features = get_features(fs_info, set); | |
732 | features &= ~supported_feature_masks[set]; | |
733 | ||
734 | if (!features) | |
735 | continue; | |
736 | ||
737 | attrs[1] = NULL; | |
738 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
739 | struct btrfs_feature_attr *fa; | |
740 | ||
741 | if (!(features & (1ULL << i))) | |
742 | continue; | |
743 | ||
744 | fa = &btrfs_feature_attrs[set][i]; | |
745 | attrs[0] = &fa->kobj_attr.attr; | |
746 | if (add) { | |
747 | int ret; | |
748 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, | |
749 | &agroup); | |
750 | if (ret) | |
751 | return ret; | |
752 | } else | |
753 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, | |
754 | &agroup); | |
755 | } | |
756 | ||
757 | } | |
758 | return 0; | |
759 | } | |
760 | ||
761 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) | |
762 | { | |
763 | if (fs_devs->devices_kobj) { | |
764 | kobject_del(fs_devs->devices_kobj); | |
765 | kobject_put(fs_devs->devices_kobj); | |
766 | fs_devs->devices_kobj = NULL; | |
767 | } | |
768 | ||
769 | if (fs_devs->fsid_kobj.state_initialized) { | |
770 | kobject_del(&fs_devs->fsid_kobj); | |
771 | kobject_put(&fs_devs->fsid_kobj); | |
772 | wait_for_completion(&fs_devs->kobj_unregister); | |
773 | } | |
774 | } | |
775 | ||
776 | /* when fs_devs is NULL it will remove all fsid kobject */ | |
777 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) | |
778 | { | |
779 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
780 | ||
781 | if (fs_devs) { | |
782 | __btrfs_sysfs_remove_fsid(fs_devs); | |
783 | return; | |
784 | } | |
785 | ||
786 | list_for_each_entry(fs_devs, fs_uuids, fs_list) { | |
787 | __btrfs_sysfs_remove_fsid(fs_devs); | |
788 | } | |
789 | } | |
790 | ||
791 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) | |
792 | { | |
793 | btrfs_reset_fs_info_ptr(fs_info); | |
794 | ||
795 | if (fs_info->space_info_kobj) { | |
796 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
797 | kobject_del(fs_info->space_info_kobj); | |
798 | kobject_put(fs_info->space_info_kobj); | |
799 | } | |
800 | #ifdef CONFIG_BTRFS_DEBUG | |
801 | if (fs_info->discard_debug_kobj) { | |
802 | sysfs_remove_files(fs_info->discard_debug_kobj, | |
803 | discard_debug_attrs); | |
804 | kobject_del(fs_info->discard_debug_kobj); | |
805 | kobject_put(fs_info->discard_debug_kobj); | |
806 | } | |
807 | if (fs_info->debug_kobj) { | |
808 | sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); | |
809 | kobject_del(fs_info->debug_kobj); | |
810 | kobject_put(fs_info->debug_kobj); | |
811 | } | |
812 | #endif | |
813 | addrm_unknown_feature_attrs(fs_info, false); | |
814 | sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); | |
815 | sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); | |
816 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); | |
817 | } | |
818 | ||
819 | static const char * const btrfs_feature_set_names[FEAT_MAX] = { | |
820 | [FEAT_COMPAT] = "compat", | |
821 | [FEAT_COMPAT_RO] = "compat_ro", | |
822 | [FEAT_INCOMPAT] = "incompat", | |
823 | }; | |
824 | ||
825 | const char * const btrfs_feature_set_name(enum btrfs_feature_set set) | |
826 | { | |
827 | return btrfs_feature_set_names[set]; | |
828 | } | |
829 | ||
830 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) | |
831 | { | |
832 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
833 | int len = 0; | |
834 | int i; | |
835 | char *str; | |
836 | ||
837 | str = kmalloc(bufsize, GFP_KERNEL); | |
838 | if (!str) | |
839 | return str; | |
840 | ||
841 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
842 | const char *name; | |
843 | ||
844 | if (!(flags & (1ULL << i))) | |
845 | continue; | |
846 | ||
847 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
848 | len += snprintf(str + len, bufsize - len, "%s%s", | |
849 | len ? "," : "", name); | |
850 | } | |
851 | ||
852 | return str; | |
853 | } | |
854 | ||
855 | static void init_feature_attrs(void) | |
856 | { | |
857 | struct btrfs_feature_attr *fa; | |
858 | int set, i; | |
859 | ||
860 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
861 | ARRAY_SIZE(btrfs_feature_attrs)); | |
862 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
863 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
864 | ||
865 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); | |
866 | memset(btrfs_unknown_feature_names, 0, | |
867 | sizeof(btrfs_unknown_feature_names)); | |
868 | ||
869 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { | |
870 | struct btrfs_feature_attr *sfa; | |
871 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
872 | int bit; | |
873 | sfa = attr_to_btrfs_feature_attr(a); | |
874 | bit = ilog2(sfa->feature_bit); | |
875 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
876 | ||
877 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
878 | } | |
879 | ||
880 | for (set = 0; set < FEAT_MAX; set++) { | |
881 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
882 | char *name = btrfs_unknown_feature_names[set][i]; | |
883 | fa = &btrfs_feature_attrs[set][i]; | |
884 | ||
885 | if (fa->kobj_attr.attr.name) | |
886 | continue; | |
887 | ||
888 | snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", | |
889 | btrfs_feature_set_names[set], i); | |
890 | ||
891 | fa->kobj_attr.attr.name = name; | |
892 | fa->kobj_attr.attr.mode = S_IRUGO; | |
893 | fa->feature_set = set; | |
894 | fa->feature_bit = 1ULL << i; | |
895 | } | |
896 | } | |
897 | } | |
898 | ||
899 | /* | |
900 | * Create a sysfs entry for a given block group type at path | |
901 | * /sys/fs/btrfs/UUID/allocation/data/TYPE | |
902 | */ | |
903 | void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) | |
904 | { | |
905 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
906 | struct btrfs_space_info *space_info = cache->space_info; | |
907 | struct raid_kobject *rkobj; | |
908 | const int index = btrfs_bg_flags_to_raid_index(cache->flags); | |
909 | unsigned int nofs_flag; | |
910 | int ret; | |
911 | ||
912 | /* | |
913 | * Setup a NOFS context because kobject_add(), deep in its call chain, | |
914 | * does GFP_KERNEL allocations, and we are often called in a context | |
915 | * where if reclaim is triggered we can deadlock (we are either holding | |
916 | * a transaction handle or some lock required for a transaction | |
917 | * commit). | |
918 | */ | |
919 | nofs_flag = memalloc_nofs_save(); | |
920 | ||
921 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); | |
922 | if (!rkobj) { | |
923 | memalloc_nofs_restore(nofs_flag); | |
924 | btrfs_warn(cache->fs_info, | |
925 | "couldn't alloc memory for raid level kobject"); | |
926 | return; | |
927 | } | |
928 | ||
929 | rkobj->flags = cache->flags; | |
930 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
931 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", | |
932 | btrfs_bg_type_to_raid_name(rkobj->flags)); | |
933 | memalloc_nofs_restore(nofs_flag); | |
934 | if (ret) { | |
935 | kobject_put(&rkobj->kobj); | |
936 | btrfs_warn(fs_info, | |
937 | "failed to add kobject for block cache, ignoring"); | |
938 | return; | |
939 | } | |
940 | ||
941 | space_info->block_group_kobjs[index] = &rkobj->kobj; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Remove sysfs directories for all block group types of a given space info and | |
946 | * the space info as well | |
947 | */ | |
948 | void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) | |
949 | { | |
950 | int i; | |
951 | ||
952 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
953 | struct kobject *kobj; | |
954 | ||
955 | kobj = space_info->block_group_kobjs[i]; | |
956 | space_info->block_group_kobjs[i] = NULL; | |
957 | if (kobj) { | |
958 | kobject_del(kobj); | |
959 | kobject_put(kobj); | |
960 | } | |
961 | } | |
962 | kobject_del(&space_info->kobj); | |
963 | kobject_put(&space_info->kobj); | |
964 | } | |
965 | ||
966 | static const char *alloc_name(u64 flags) | |
967 | { | |
968 | switch (flags) { | |
969 | case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: | |
970 | return "mixed"; | |
971 | case BTRFS_BLOCK_GROUP_METADATA: | |
972 | return "metadata"; | |
973 | case BTRFS_BLOCK_GROUP_DATA: | |
974 | return "data"; | |
975 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
976 | return "system"; | |
977 | default: | |
978 | WARN_ON(1); | |
979 | return "invalid-combination"; | |
980 | }; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Create a sysfs entry for a space info type at path | |
985 | * /sys/fs/btrfs/UUID/allocation/TYPE | |
986 | */ | |
987 | int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, | |
988 | struct btrfs_space_info *space_info) | |
989 | { | |
990 | int ret; | |
991 | ||
992 | ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, | |
993 | fs_info->space_info_kobj, "%s", | |
994 | alloc_name(space_info->flags)); | |
995 | if (ret) { | |
996 | kobject_put(&space_info->kobj); | |
997 | return ret; | |
998 | } | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | /* when one_device is NULL, it removes all device links */ | |
1004 | ||
1005 | int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, | |
1006 | struct btrfs_device *one_device) | |
1007 | { | |
1008 | struct hd_struct *disk; | |
1009 | struct kobject *disk_kobj; | |
1010 | ||
1011 | if (!fs_devices->devices_kobj) | |
1012 | return -EINVAL; | |
1013 | ||
1014 | if (one_device && one_device->bdev) { | |
1015 | disk = one_device->bdev->bd_part; | |
1016 | disk_kobj = &part_to_dev(disk)->kobj; | |
1017 | ||
1018 | sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name); | |
1019 | } | |
1020 | ||
1021 | if (one_device) | |
1022 | return 0; | |
1023 | ||
1024 | list_for_each_entry(one_device, | |
1025 | &fs_devices->devices, dev_list) { | |
1026 | if (!one_device->bdev) | |
1027 | continue; | |
1028 | disk = one_device->bdev->bd_part; | |
1029 | disk_kobj = &part_to_dev(disk)->kobj; | |
1030 | ||
1031 | sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name); | |
1032 | } | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, | |
1038 | struct btrfs_device *one_device) | |
1039 | { | |
1040 | int error = 0; | |
1041 | struct btrfs_device *dev; | |
1042 | ||
1043 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { | |
1044 | struct hd_struct *disk; | |
1045 | struct kobject *disk_kobj; | |
1046 | ||
1047 | if (!dev->bdev) | |
1048 | continue; | |
1049 | ||
1050 | if (one_device && one_device != dev) | |
1051 | continue; | |
1052 | ||
1053 | disk = dev->bdev->bd_part; | |
1054 | disk_kobj = &part_to_dev(disk)->kobj; | |
1055 | ||
1056 | error = sysfs_create_link(fs_devices->devices_kobj, | |
1057 | disk_kobj, disk_kobj->name); | |
1058 | if (error) | |
1059 | break; | |
1060 | } | |
1061 | ||
1062 | return error; | |
1063 | } | |
1064 | ||
1065 | void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) | |
1066 | { | |
1067 | int ret; | |
1068 | ||
1069 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
1070 | if (ret) | |
1071 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", | |
1072 | action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
1073 | &disk_to_dev(bdev->bd_disk)->kobj); | |
1074 | } | |
1075 | ||
1076 | void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices, | |
1077 | const u8 *fsid) | |
1078 | { | |
1079 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
1080 | ||
1081 | /* | |
1082 | * Sprouting changes fsid of the mounted filesystem, rename the fsid | |
1083 | * directory | |
1084 | */ | |
1085 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid); | |
1086 | if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) | |
1087 | btrfs_warn(fs_devices->fs_info, | |
1088 | "sysfs: failed to create fsid for sprout"); | |
1089 | } | |
1090 | ||
1091 | /* /sys/fs/btrfs/ entry */ | |
1092 | static struct kset *btrfs_kset; | |
1093 | ||
1094 | /* | |
1095 | * Creates: | |
1096 | * /sys/fs/btrfs/UUID | |
1097 | * | |
1098 | * Can be called by the device discovery thread. | |
1099 | */ | |
1100 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) | |
1101 | { | |
1102 | int error; | |
1103 | ||
1104 | init_completion(&fs_devs->kobj_unregister); | |
1105 | fs_devs->fsid_kobj.kset = btrfs_kset; | |
1106 | error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, | |
1107 | "%pU", fs_devs->fsid); | |
1108 | if (error) { | |
1109 | kobject_put(&fs_devs->fsid_kobj); | |
1110 | return error; | |
1111 | } | |
1112 | ||
1113 | fs_devs->devices_kobj = kobject_create_and_add("devices", | |
1114 | &fs_devs->fsid_kobj); | |
1115 | if (!fs_devs->devices_kobj) { | |
1116 | btrfs_err(fs_devs->fs_info, | |
1117 | "failed to init sysfs device interface"); | |
1118 | kobject_put(&fs_devs->fsid_kobj); | |
1119 | return -ENOMEM; | |
1120 | } | |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) | |
1126 | { | |
1127 | int error; | |
1128 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; | |
1129 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; | |
1130 | ||
1131 | btrfs_set_fs_info_ptr(fs_info); | |
1132 | ||
1133 | error = btrfs_sysfs_add_device_link(fs_devs, NULL); | |
1134 | if (error) | |
1135 | return error; | |
1136 | ||
1137 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); | |
1138 | if (error) { | |
1139 | btrfs_sysfs_rm_device_link(fs_devs, NULL); | |
1140 | return error; | |
1141 | } | |
1142 | ||
1143 | error = sysfs_create_group(fsid_kobj, | |
1144 | &btrfs_feature_attr_group); | |
1145 | if (error) | |
1146 | goto failure; | |
1147 | ||
1148 | #ifdef CONFIG_BTRFS_DEBUG | |
1149 | fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); | |
1150 | if (!fs_info->debug_kobj) { | |
1151 | error = -ENOMEM; | |
1152 | goto failure; | |
1153 | } | |
1154 | ||
1155 | error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); | |
1156 | if (error) | |
1157 | goto failure; | |
1158 | ||
1159 | /* Discard directory */ | |
1160 | fs_info->discard_debug_kobj = kobject_create_and_add("discard", | |
1161 | fs_info->debug_kobj); | |
1162 | if (!fs_info->discard_debug_kobj) { | |
1163 | error = -ENOMEM; | |
1164 | goto failure; | |
1165 | } | |
1166 | ||
1167 | error = sysfs_create_files(fs_info->discard_debug_kobj, | |
1168 | discard_debug_attrs); | |
1169 | if (error) | |
1170 | goto failure; | |
1171 | #endif | |
1172 | ||
1173 | error = addrm_unknown_feature_attrs(fs_info, true); | |
1174 | if (error) | |
1175 | goto failure; | |
1176 | ||
1177 | fs_info->space_info_kobj = kobject_create_and_add("allocation", | |
1178 | fsid_kobj); | |
1179 | if (!fs_info->space_info_kobj) { | |
1180 | error = -ENOMEM; | |
1181 | goto failure; | |
1182 | } | |
1183 | ||
1184 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
1185 | if (error) | |
1186 | goto failure; | |
1187 | ||
1188 | return 0; | |
1189 | failure: | |
1190 | btrfs_sysfs_remove_mounted(fs_info); | |
1191 | return error; | |
1192 | } | |
1193 | ||
1194 | ||
1195 | /* | |
1196 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
1197 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
1198 | */ | |
1199 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, | |
1200 | u64 bit, enum btrfs_feature_set set) | |
1201 | { | |
1202 | struct btrfs_fs_devices *fs_devs; | |
1203 | struct kobject *fsid_kobj; | |
1204 | u64 features; | |
1205 | int ret; | |
1206 | ||
1207 | if (!fs_info) | |
1208 | return; | |
1209 | ||
1210 | features = get_features(fs_info, set); | |
1211 | ASSERT(bit & supported_feature_masks[set]); | |
1212 | ||
1213 | fs_devs = fs_info->fs_devices; | |
1214 | fsid_kobj = &fs_devs->fsid_kobj; | |
1215 | ||
1216 | if (!fsid_kobj->state_initialized) | |
1217 | return; | |
1218 | ||
1219 | /* | |
1220 | * FIXME: this is too heavy to update just one value, ideally we'd like | |
1221 | * to use sysfs_update_group but some refactoring is needed first. | |
1222 | */ | |
1223 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); | |
1224 | ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); | |
1225 | } | |
1226 | ||
1227 | int __init btrfs_init_sysfs(void) | |
1228 | { | |
1229 | int ret; | |
1230 | ||
1231 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); | |
1232 | if (!btrfs_kset) | |
1233 | return -ENOMEM; | |
1234 | ||
1235 | init_feature_attrs(); | |
1236 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); | |
1237 | if (ret) | |
1238 | goto out2; | |
1239 | ret = sysfs_merge_group(&btrfs_kset->kobj, | |
1240 | &btrfs_static_feature_attr_group); | |
1241 | if (ret) | |
1242 | goto out_remove_group; | |
1243 | ||
1244 | #ifdef CONFIG_BTRFS_DEBUG | |
1245 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
1246 | if (ret) | |
1247 | goto out2; | |
1248 | #endif | |
1249 | ||
1250 | return 0; | |
1251 | ||
1252 | out_remove_group: | |
1253 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); | |
1254 | out2: | |
1255 | kset_unregister(btrfs_kset); | |
1256 | ||
1257 | return ret; | |
1258 | } | |
1259 | ||
1260 | void __cold btrfs_exit_sysfs(void) | |
1261 | { | |
1262 | sysfs_unmerge_group(&btrfs_kset->kobj, | |
1263 | &btrfs_static_feature_attr_group); | |
1264 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); | |
1265 | #ifdef CONFIG_BTRFS_DEBUG | |
1266 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
1267 | #endif | |
1268 | kset_unregister(btrfs_kset); | |
1269 | } | |
1270 |