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[mirror_ubuntu-jammy-kernel.git] / fs / btrfs / sysfs.c
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 #include "qgroup.h"
23
24 struct btrfs_feature_attr {
25 struct kobj_attribute kobj_attr;
26 enum btrfs_feature_set feature_set;
27 u64 feature_bit;
28 };
29
30 /* For raid type sysfs entries */
31 struct raid_kobject {
32 u64 flags;
33 struct kobject kobj;
34 };
35
36 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
37 { \
38 .attr = { .name = __stringify(_name), .mode = _mode }, \
39 .show = _show, \
40 .store = _store, \
41 }
42
43 #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \
44 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
45 __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
46
47 #define BTRFS_ATTR(_prefix, _name, _show) \
48 static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
49 __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
50
51 #define BTRFS_ATTR_PTR(_prefix, _name) \
52 (&btrfs_attr_##_prefix##_##_name.attr)
53
54 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \
55 static struct btrfs_feature_attr btrfs_attr_features_##_name = { \
56 .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
57 btrfs_feature_attr_show, \
58 btrfs_feature_attr_store), \
59 .feature_set = _feature_set, \
60 .feature_bit = _feature_prefix ##_## _feature_bit, \
61 }
62 #define BTRFS_FEAT_ATTR_PTR(_name) \
63 (&btrfs_attr_features_##_name.kobj_attr.attr)
64
65 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
66 BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
67 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
68 BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
69 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
70 BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
71
72 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
73 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
74
75 static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a)
76 {
77 return container_of(a, struct btrfs_feature_attr, kobj_attr);
78 }
79
80 static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
81 {
82 return container_of(attr, struct kobj_attribute, attr);
83 }
84
85 static struct btrfs_feature_attr *attr_to_btrfs_feature_attr(
86 struct attribute *attr)
87 {
88 return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
89 }
90
91 static u64 get_features(struct btrfs_fs_info *fs_info,
92 enum btrfs_feature_set set)
93 {
94 struct btrfs_super_block *disk_super = fs_info->super_copy;
95 if (set == FEAT_COMPAT)
96 return btrfs_super_compat_flags(disk_super);
97 else if (set == FEAT_COMPAT_RO)
98 return btrfs_super_compat_ro_flags(disk_super);
99 else
100 return btrfs_super_incompat_flags(disk_super);
101 }
102
103 static void set_features(struct btrfs_fs_info *fs_info,
104 enum btrfs_feature_set set, u64 features)
105 {
106 struct btrfs_super_block *disk_super = fs_info->super_copy;
107 if (set == FEAT_COMPAT)
108 btrfs_set_super_compat_flags(disk_super, features);
109 else if (set == FEAT_COMPAT_RO)
110 btrfs_set_super_compat_ro_flags(disk_super, features);
111 else
112 btrfs_set_super_incompat_flags(disk_super, features);
113 }
114
115 static int can_modify_feature(struct btrfs_feature_attr *fa)
116 {
117 int val = 0;
118 u64 set, clear;
119 switch (fa->feature_set) {
120 case FEAT_COMPAT:
121 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
122 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
123 break;
124 case FEAT_COMPAT_RO:
125 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
126 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
127 break;
128 case FEAT_INCOMPAT:
129 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
130 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
131 break;
132 default:
133 pr_warn("btrfs: sysfs: unknown feature set %d\n",
134 fa->feature_set);
135 return 0;
136 }
137
138 if (set & fa->feature_bit)
139 val |= 1;
140 if (clear & fa->feature_bit)
141 val |= 2;
142
143 return val;
144 }
145
146 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
147 struct kobj_attribute *a, char *buf)
148 {
149 int val = 0;
150 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
151 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
152 if (fs_info) {
153 u64 features = get_features(fs_info, fa->feature_set);
154 if (features & fa->feature_bit)
155 val = 1;
156 } else
157 val = can_modify_feature(fa);
158
159 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
160 }
161
162 static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
163 struct kobj_attribute *a,
164 const char *buf, size_t count)
165 {
166 struct btrfs_fs_info *fs_info;
167 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
168 u64 features, set, clear;
169 unsigned long val;
170 int ret;
171
172 fs_info = to_fs_info(kobj);
173 if (!fs_info)
174 return -EPERM;
175
176 if (sb_rdonly(fs_info->sb))
177 return -EROFS;
178
179 ret = kstrtoul(skip_spaces(buf), 0, &val);
180 if (ret)
181 return ret;
182
183 if (fa->feature_set == FEAT_COMPAT) {
184 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
185 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
186 } else if (fa->feature_set == FEAT_COMPAT_RO) {
187 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
188 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
189 } else {
190 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
191 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
192 }
193
194 features = get_features(fs_info, fa->feature_set);
195
196 /* Nothing to do */
197 if ((val && (features & fa->feature_bit)) ||
198 (!val && !(features & fa->feature_bit)))
199 return count;
200
201 if ((val && !(set & fa->feature_bit)) ||
202 (!val && !(clear & fa->feature_bit))) {
203 btrfs_info(fs_info,
204 "%sabling feature %s on mounted fs is not supported.",
205 val ? "En" : "Dis", fa->kobj_attr.attr.name);
206 return -EPERM;
207 }
208
209 btrfs_info(fs_info, "%s %s feature flag",
210 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
211
212 spin_lock(&fs_info->super_lock);
213 features = get_features(fs_info, fa->feature_set);
214 if (val)
215 features |= fa->feature_bit;
216 else
217 features &= ~fa->feature_bit;
218 set_features(fs_info, fa->feature_set, features);
219 spin_unlock(&fs_info->super_lock);
220
221 /*
222 * We don't want to do full transaction commit from inside sysfs
223 */
224 btrfs_set_pending(fs_info, COMMIT);
225 wake_up_process(fs_info->transaction_kthread);
226
227 return count;
228 }
229
230 static umode_t btrfs_feature_visible(struct kobject *kobj,
231 struct attribute *attr, int unused)
232 {
233 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
234 umode_t mode = attr->mode;
235
236 if (fs_info) {
237 struct btrfs_feature_attr *fa;
238 u64 features;
239
240 fa = attr_to_btrfs_feature_attr(attr);
241 features = get_features(fs_info, fa->feature_set);
242
243 if (can_modify_feature(fa))
244 mode |= S_IWUSR;
245 else if (!(features & fa->feature_bit))
246 mode = 0;
247 }
248
249 return mode;
250 }
251
252 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
253 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
254 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
255 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
256 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
257 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
258 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
259 BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
260 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
261 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
262 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
263 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
264 BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);
265
266 static struct attribute *btrfs_supported_feature_attrs[] = {
267 BTRFS_FEAT_ATTR_PTR(mixed_backref),
268 BTRFS_FEAT_ATTR_PTR(default_subvol),
269 BTRFS_FEAT_ATTR_PTR(mixed_groups),
270 BTRFS_FEAT_ATTR_PTR(compress_lzo),
271 BTRFS_FEAT_ATTR_PTR(compress_zstd),
272 BTRFS_FEAT_ATTR_PTR(big_metadata),
273 BTRFS_FEAT_ATTR_PTR(extended_iref),
274 BTRFS_FEAT_ATTR_PTR(raid56),
275 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
276 BTRFS_FEAT_ATTR_PTR(no_holes),
277 BTRFS_FEAT_ATTR_PTR(metadata_uuid),
278 BTRFS_FEAT_ATTR_PTR(free_space_tree),
279 BTRFS_FEAT_ATTR_PTR(raid1c34),
280 NULL
281 };
282
283 /*
284 * Features which depend on feature bits and may differ between each fs.
285 *
286 * /sys/fs/btrfs/features lists all available features of this kernel while
287 * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or
288 * can be changed online.
289 */
290 static const struct attribute_group btrfs_feature_attr_group = {
291 .name = "features",
292 .is_visible = btrfs_feature_visible,
293 .attrs = btrfs_supported_feature_attrs,
294 };
295
296 static ssize_t rmdir_subvol_show(struct kobject *kobj,
297 struct kobj_attribute *ka, char *buf)
298 {
299 return scnprintf(buf, PAGE_SIZE, "0\n");
300 }
301 BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
302
303 static ssize_t supported_checksums_show(struct kobject *kobj,
304 struct kobj_attribute *a, char *buf)
305 {
306 ssize_t ret = 0;
307 int i;
308
309 for (i = 0; i < btrfs_get_num_csums(); i++) {
310 /*
311 * This "trick" only works as long as 'enum btrfs_csum_type' has
312 * no holes in it
313 */
314 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
315 (i == 0 ? "" : " "), btrfs_super_csum_name(i));
316
317 }
318
319 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
320 return ret;
321 }
322 BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);
323
324 static struct attribute *btrfs_supported_static_feature_attrs[] = {
325 BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
326 BTRFS_ATTR_PTR(static_feature, supported_checksums),
327 NULL
328 };
329
330 /*
331 * Features which only depend on kernel version.
332 *
333 * These are listed in /sys/fs/btrfs/features along with
334 * btrfs_feature_attr_group
335 */
336 static const struct attribute_group btrfs_static_feature_attr_group = {
337 .name = "features",
338 .attrs = btrfs_supported_static_feature_attrs,
339 };
340
341 #ifdef CONFIG_BTRFS_DEBUG
342
343 /*
344 * Discard statistics and tunables
345 */
346 #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent)
347
348 static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
349 struct kobj_attribute *a,
350 char *buf)
351 {
352 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
353
354 return scnprintf(buf, PAGE_SIZE, "%lld\n",
355 atomic64_read(&fs_info->discard_ctl.discardable_bytes));
356 }
357 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
358
359 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
360 struct kobj_attribute *a,
361 char *buf)
362 {
363 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
364
365 return scnprintf(buf, PAGE_SIZE, "%d\n",
366 atomic_read(&fs_info->discard_ctl.discardable_extents));
367 }
368 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
369
370 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
371 struct kobj_attribute *a,
372 char *buf)
373 {
374 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
375
376 return scnprintf(buf, PAGE_SIZE, "%lld\n",
377 fs_info->discard_ctl.discard_bitmap_bytes);
378 }
379 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
380
381 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
382 struct kobj_attribute *a,
383 char *buf)
384 {
385 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
386
387 return scnprintf(buf, PAGE_SIZE, "%lld\n",
388 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
389 }
390 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
391
392 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
393 struct kobj_attribute *a,
394 char *buf)
395 {
396 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
397
398 return scnprintf(buf, PAGE_SIZE, "%lld\n",
399 fs_info->discard_ctl.discard_extent_bytes);
400 }
401 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
402
403 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
404 struct kobj_attribute *a,
405 char *buf)
406 {
407 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
408
409 return scnprintf(buf, PAGE_SIZE, "%u\n",
410 READ_ONCE(fs_info->discard_ctl.iops_limit));
411 }
412
413 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
414 struct kobj_attribute *a,
415 const char *buf, size_t len)
416 {
417 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
418 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
419 u32 iops_limit;
420 int ret;
421
422 ret = kstrtou32(buf, 10, &iops_limit);
423 if (ret)
424 return -EINVAL;
425
426 WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
427
428 return len;
429 }
430 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
431 btrfs_discard_iops_limit_store);
432
433 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
434 struct kobj_attribute *a,
435 char *buf)
436 {
437 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
438
439 return scnprintf(buf, PAGE_SIZE, "%u\n",
440 READ_ONCE(fs_info->discard_ctl.kbps_limit));
441 }
442
443 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
444 struct kobj_attribute *a,
445 const char *buf, size_t len)
446 {
447 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
448 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
449 u32 kbps_limit;
450 int ret;
451
452 ret = kstrtou32(buf, 10, &kbps_limit);
453 if (ret)
454 return -EINVAL;
455
456 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
457
458 return len;
459 }
460 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
461 btrfs_discard_kbps_limit_store);
462
463 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
464 struct kobj_attribute *a,
465 char *buf)
466 {
467 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
468
469 return scnprintf(buf, PAGE_SIZE, "%llu\n",
470 READ_ONCE(fs_info->discard_ctl.max_discard_size));
471 }
472
473 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
474 struct kobj_attribute *a,
475 const char *buf, size_t len)
476 {
477 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
478 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
479 u64 max_discard_size;
480 int ret;
481
482 ret = kstrtou64(buf, 10, &max_discard_size);
483 if (ret)
484 return -EINVAL;
485
486 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
487
488 return len;
489 }
490 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
491 btrfs_discard_max_discard_size_store);
492
493 static const struct attribute *discard_debug_attrs[] = {
494 BTRFS_ATTR_PTR(discard, discardable_bytes),
495 BTRFS_ATTR_PTR(discard, discardable_extents),
496 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
497 BTRFS_ATTR_PTR(discard, discard_bytes_saved),
498 BTRFS_ATTR_PTR(discard, discard_extent_bytes),
499 BTRFS_ATTR_PTR(discard, iops_limit),
500 BTRFS_ATTR_PTR(discard, kbps_limit),
501 BTRFS_ATTR_PTR(discard, max_discard_size),
502 NULL,
503 };
504
505 /*
506 * Runtime debugging exported via sysfs
507 *
508 * /sys/fs/btrfs/debug - applies to module or all filesystems
509 * /sys/fs/btrfs/UUID - applies only to the given filesystem
510 */
511 static const struct attribute *btrfs_debug_mount_attrs[] = {
512 NULL,
513 };
514
515 static struct attribute *btrfs_debug_feature_attrs[] = {
516 NULL
517 };
518
519 static const struct attribute_group btrfs_debug_feature_attr_group = {
520 .name = "debug",
521 .attrs = btrfs_debug_feature_attrs,
522 };
523
524 #endif
525
526 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
527 {
528 u64 val;
529 if (lock)
530 spin_lock(lock);
531 val = *value_ptr;
532 if (lock)
533 spin_unlock(lock);
534 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
535 }
536
537 static ssize_t global_rsv_size_show(struct kobject *kobj,
538 struct kobj_attribute *ka, char *buf)
539 {
540 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
541 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
542 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
543 }
544 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
545
546 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
547 struct kobj_attribute *a, char *buf)
548 {
549 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
550 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
551 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
552 }
553 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
554
555 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
556 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
557
558 static ssize_t raid_bytes_show(struct kobject *kobj,
559 struct kobj_attribute *attr, char *buf);
560 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
561 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
562
563 static ssize_t raid_bytes_show(struct kobject *kobj,
564 struct kobj_attribute *attr, char *buf)
565
566 {
567 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
568 struct btrfs_block_group *block_group;
569 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
570 u64 val = 0;
571
572 down_read(&sinfo->groups_sem);
573 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
574 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
575 val += block_group->length;
576 else
577 val += block_group->used;
578 }
579 up_read(&sinfo->groups_sem);
580 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
581 }
582
583 static struct attribute *raid_attrs[] = {
584 BTRFS_ATTR_PTR(raid, total_bytes),
585 BTRFS_ATTR_PTR(raid, used_bytes),
586 NULL
587 };
588 ATTRIBUTE_GROUPS(raid);
589
590 static void release_raid_kobj(struct kobject *kobj)
591 {
592 kfree(to_raid_kobj(kobj));
593 }
594
595 static struct kobj_type btrfs_raid_ktype = {
596 .sysfs_ops = &kobj_sysfs_ops,
597 .release = release_raid_kobj,
598 .default_groups = raid_groups,
599 };
600
601 #define SPACE_INFO_ATTR(field) \
602 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
603 struct kobj_attribute *a, \
604 char *buf) \
605 { \
606 struct btrfs_space_info *sinfo = to_space_info(kobj); \
607 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
608 } \
609 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
610
611 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
612 struct kobj_attribute *a,
613 char *buf)
614 {
615 struct btrfs_space_info *sinfo = to_space_info(kobj);
616 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
617 return scnprintf(buf, PAGE_SIZE, "%lld\n", val);
618 }
619
620 SPACE_INFO_ATTR(flags);
621 SPACE_INFO_ATTR(total_bytes);
622 SPACE_INFO_ATTR(bytes_used);
623 SPACE_INFO_ATTR(bytes_pinned);
624 SPACE_INFO_ATTR(bytes_reserved);
625 SPACE_INFO_ATTR(bytes_may_use);
626 SPACE_INFO_ATTR(bytes_readonly);
627 SPACE_INFO_ATTR(disk_used);
628 SPACE_INFO_ATTR(disk_total);
629 BTRFS_ATTR(space_info, total_bytes_pinned,
630 btrfs_space_info_show_total_bytes_pinned);
631
632 static struct attribute *space_info_attrs[] = {
633 BTRFS_ATTR_PTR(space_info, flags),
634 BTRFS_ATTR_PTR(space_info, total_bytes),
635 BTRFS_ATTR_PTR(space_info, bytes_used),
636 BTRFS_ATTR_PTR(space_info, bytes_pinned),
637 BTRFS_ATTR_PTR(space_info, bytes_reserved),
638 BTRFS_ATTR_PTR(space_info, bytes_may_use),
639 BTRFS_ATTR_PTR(space_info, bytes_readonly),
640 BTRFS_ATTR_PTR(space_info, disk_used),
641 BTRFS_ATTR_PTR(space_info, disk_total),
642 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
643 NULL,
644 };
645 ATTRIBUTE_GROUPS(space_info);
646
647 static void space_info_release(struct kobject *kobj)
648 {
649 struct btrfs_space_info *sinfo = to_space_info(kobj);
650 percpu_counter_destroy(&sinfo->total_bytes_pinned);
651 kfree(sinfo);
652 }
653
654 static struct kobj_type space_info_ktype = {
655 .sysfs_ops = &kobj_sysfs_ops,
656 .release = space_info_release,
657 .default_groups = space_info_groups,
658 };
659
660 static const struct attribute *allocation_attrs[] = {
661 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
662 BTRFS_ATTR_PTR(allocation, global_rsv_size),
663 NULL,
664 };
665
666 static ssize_t btrfs_label_show(struct kobject *kobj,
667 struct kobj_attribute *a, char *buf)
668 {
669 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
670 char *label = fs_info->super_copy->label;
671 ssize_t ret;
672
673 spin_lock(&fs_info->super_lock);
674 ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
675 spin_unlock(&fs_info->super_lock);
676
677 return ret;
678 }
679
680 static ssize_t btrfs_label_store(struct kobject *kobj,
681 struct kobj_attribute *a,
682 const char *buf, size_t len)
683 {
684 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
685 size_t p_len;
686
687 if (!fs_info)
688 return -EPERM;
689
690 if (sb_rdonly(fs_info->sb))
691 return -EROFS;
692
693 /*
694 * p_len is the len until the first occurrence of either
695 * '\n' or '\0'
696 */
697 p_len = strcspn(buf, "\n");
698
699 if (p_len >= BTRFS_LABEL_SIZE)
700 return -EINVAL;
701
702 spin_lock(&fs_info->super_lock);
703 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
704 memcpy(fs_info->super_copy->label, buf, p_len);
705 spin_unlock(&fs_info->super_lock);
706
707 /*
708 * We don't want to do full transaction commit from inside sysfs
709 */
710 btrfs_set_pending(fs_info, COMMIT);
711 wake_up_process(fs_info->transaction_kthread);
712
713 return len;
714 }
715 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
716
717 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
718 struct kobj_attribute *a, char *buf)
719 {
720 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
721
722 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
723 }
724
725 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
726
727 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
728 struct kobj_attribute *a, char *buf)
729 {
730 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
731
732 return scnprintf(buf, PAGE_SIZE, "%u\n",
733 fs_info->super_copy->sectorsize);
734 }
735
736 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
737
738 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
739 struct kobj_attribute *a, char *buf)
740 {
741 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
742
743 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
744 }
745
746 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
747
748 static ssize_t quota_override_show(struct kobject *kobj,
749 struct kobj_attribute *a, char *buf)
750 {
751 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
752 int quota_override;
753
754 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
755 return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override);
756 }
757
758 static ssize_t quota_override_store(struct kobject *kobj,
759 struct kobj_attribute *a,
760 const char *buf, size_t len)
761 {
762 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
763 unsigned long knob;
764 int err;
765
766 if (!fs_info)
767 return -EPERM;
768
769 if (!capable(CAP_SYS_RESOURCE))
770 return -EPERM;
771
772 err = kstrtoul(buf, 10, &knob);
773 if (err)
774 return err;
775 if (knob > 1)
776 return -EINVAL;
777
778 if (knob)
779 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
780 else
781 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
782
783 return len;
784 }
785
786 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
787
788 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
789 struct kobj_attribute *a, char *buf)
790 {
791 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
792
793 return scnprintf(buf, PAGE_SIZE, "%pU\n",
794 fs_info->fs_devices->metadata_uuid);
795 }
796
797 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
798
799 static ssize_t btrfs_checksum_show(struct kobject *kobj,
800 struct kobj_attribute *a, char *buf)
801 {
802 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
803 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
804
805 return scnprintf(buf, PAGE_SIZE, "%s (%s)\n",
806 btrfs_super_csum_name(csum_type),
807 crypto_shash_driver_name(fs_info->csum_shash));
808 }
809
810 BTRFS_ATTR(, checksum, btrfs_checksum_show);
811
812 static const struct attribute *btrfs_attrs[] = {
813 BTRFS_ATTR_PTR(, label),
814 BTRFS_ATTR_PTR(, nodesize),
815 BTRFS_ATTR_PTR(, sectorsize),
816 BTRFS_ATTR_PTR(, clone_alignment),
817 BTRFS_ATTR_PTR(, quota_override),
818 BTRFS_ATTR_PTR(, metadata_uuid),
819 BTRFS_ATTR_PTR(, checksum),
820 NULL,
821 };
822
823 static void btrfs_release_fsid_kobj(struct kobject *kobj)
824 {
825 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
826
827 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
828 complete(&fs_devs->kobj_unregister);
829 }
830
831 static struct kobj_type btrfs_ktype = {
832 .sysfs_ops = &kobj_sysfs_ops,
833 .release = btrfs_release_fsid_kobj,
834 };
835
836 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
837 {
838 if (kobj->ktype != &btrfs_ktype)
839 return NULL;
840 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
841 }
842
843 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
844 {
845 if (kobj->ktype != &btrfs_ktype)
846 return NULL;
847 return to_fs_devs(kobj)->fs_info;
848 }
849
850 #define NUM_FEATURE_BITS 64
851 #define BTRFS_FEATURE_NAME_MAX 13
852 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
853 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
854
855 static const u64 supported_feature_masks[FEAT_MAX] = {
856 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
857 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
858 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
859 };
860
861 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
862 {
863 int set;
864
865 for (set = 0; set < FEAT_MAX; set++) {
866 int i;
867 struct attribute *attrs[2];
868 struct attribute_group agroup = {
869 .name = "features",
870 .attrs = attrs,
871 };
872 u64 features = get_features(fs_info, set);
873 features &= ~supported_feature_masks[set];
874
875 if (!features)
876 continue;
877
878 attrs[1] = NULL;
879 for (i = 0; i < NUM_FEATURE_BITS; i++) {
880 struct btrfs_feature_attr *fa;
881
882 if (!(features & (1ULL << i)))
883 continue;
884
885 fa = &btrfs_feature_attrs[set][i];
886 attrs[0] = &fa->kobj_attr.attr;
887 if (add) {
888 int ret;
889 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
890 &agroup);
891 if (ret)
892 return ret;
893 } else
894 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
895 &agroup);
896 }
897
898 }
899 return 0;
900 }
901
902 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
903 {
904 if (fs_devs->devinfo_kobj) {
905 kobject_del(fs_devs->devinfo_kobj);
906 kobject_put(fs_devs->devinfo_kobj);
907 fs_devs->devinfo_kobj = NULL;
908 }
909
910 if (fs_devs->devices_kobj) {
911 kobject_del(fs_devs->devices_kobj);
912 kobject_put(fs_devs->devices_kobj);
913 fs_devs->devices_kobj = NULL;
914 }
915
916 if (fs_devs->fsid_kobj.state_initialized) {
917 kobject_del(&fs_devs->fsid_kobj);
918 kobject_put(&fs_devs->fsid_kobj);
919 wait_for_completion(&fs_devs->kobj_unregister);
920 }
921 }
922
923 /* when fs_devs is NULL it will remove all fsid kobject */
924 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
925 {
926 struct list_head *fs_uuids = btrfs_get_fs_uuids();
927
928 if (fs_devs) {
929 __btrfs_sysfs_remove_fsid(fs_devs);
930 return;
931 }
932
933 list_for_each_entry(fs_devs, fs_uuids, fs_list) {
934 __btrfs_sysfs_remove_fsid(fs_devs);
935 }
936 }
937
938 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
939 {
940 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
941
942 btrfs_reset_fs_info_ptr(fs_info);
943
944 sysfs_remove_link(fsid_kobj, "bdi");
945
946 if (fs_info->space_info_kobj) {
947 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
948 kobject_del(fs_info->space_info_kobj);
949 kobject_put(fs_info->space_info_kobj);
950 }
951 #ifdef CONFIG_BTRFS_DEBUG
952 if (fs_info->discard_debug_kobj) {
953 sysfs_remove_files(fs_info->discard_debug_kobj,
954 discard_debug_attrs);
955 kobject_del(fs_info->discard_debug_kobj);
956 kobject_put(fs_info->discard_debug_kobj);
957 }
958 if (fs_info->debug_kobj) {
959 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
960 kobject_del(fs_info->debug_kobj);
961 kobject_put(fs_info->debug_kobj);
962 }
963 #endif
964 addrm_unknown_feature_attrs(fs_info, false);
965 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
966 sysfs_remove_files(fsid_kobj, btrfs_attrs);
967 btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, NULL);
968 }
969
970 static const char * const btrfs_feature_set_names[FEAT_MAX] = {
971 [FEAT_COMPAT] = "compat",
972 [FEAT_COMPAT_RO] = "compat_ro",
973 [FEAT_INCOMPAT] = "incompat",
974 };
975
976 const char * const btrfs_feature_set_name(enum btrfs_feature_set set)
977 {
978 return btrfs_feature_set_names[set];
979 }
980
981 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
982 {
983 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
984 int len = 0;
985 int i;
986 char *str;
987
988 str = kmalloc(bufsize, GFP_KERNEL);
989 if (!str)
990 return str;
991
992 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
993 const char *name;
994
995 if (!(flags & (1ULL << i)))
996 continue;
997
998 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
999 len += scnprintf(str + len, bufsize - len, "%s%s",
1000 len ? "," : "", name);
1001 }
1002
1003 return str;
1004 }
1005
1006 static void init_feature_attrs(void)
1007 {
1008 struct btrfs_feature_attr *fa;
1009 int set, i;
1010
1011 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
1012 ARRAY_SIZE(btrfs_feature_attrs));
1013 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
1014 ARRAY_SIZE(btrfs_feature_attrs[0]));
1015
1016 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
1017 memset(btrfs_unknown_feature_names, 0,
1018 sizeof(btrfs_unknown_feature_names));
1019
1020 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
1021 struct btrfs_feature_attr *sfa;
1022 struct attribute *a = btrfs_supported_feature_attrs[i];
1023 int bit;
1024 sfa = attr_to_btrfs_feature_attr(a);
1025 bit = ilog2(sfa->feature_bit);
1026 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
1027
1028 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
1029 }
1030
1031 for (set = 0; set < FEAT_MAX; set++) {
1032 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1033 char *name = btrfs_unknown_feature_names[set][i];
1034 fa = &btrfs_feature_attrs[set][i];
1035
1036 if (fa->kobj_attr.attr.name)
1037 continue;
1038
1039 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
1040 btrfs_feature_set_names[set], i);
1041
1042 fa->kobj_attr.attr.name = name;
1043 fa->kobj_attr.attr.mode = S_IRUGO;
1044 fa->feature_set = set;
1045 fa->feature_bit = 1ULL << i;
1046 }
1047 }
1048 }
1049
1050 /*
1051 * Create a sysfs entry for a given block group type at path
1052 * /sys/fs/btrfs/UUID/allocation/data/TYPE
1053 */
1054 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
1055 {
1056 struct btrfs_fs_info *fs_info = cache->fs_info;
1057 struct btrfs_space_info *space_info = cache->space_info;
1058 struct raid_kobject *rkobj;
1059 const int index = btrfs_bg_flags_to_raid_index(cache->flags);
1060 unsigned int nofs_flag;
1061 int ret;
1062
1063 /*
1064 * Setup a NOFS context because kobject_add(), deep in its call chain,
1065 * does GFP_KERNEL allocations, and we are often called in a context
1066 * where if reclaim is triggered we can deadlock (we are either holding
1067 * a transaction handle or some lock required for a transaction
1068 * commit).
1069 */
1070 nofs_flag = memalloc_nofs_save();
1071
1072 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
1073 if (!rkobj) {
1074 memalloc_nofs_restore(nofs_flag);
1075 btrfs_warn(cache->fs_info,
1076 "couldn't alloc memory for raid level kobject");
1077 return;
1078 }
1079
1080 rkobj->flags = cache->flags;
1081 kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
1082 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
1083 btrfs_bg_type_to_raid_name(rkobj->flags));
1084 memalloc_nofs_restore(nofs_flag);
1085 if (ret) {
1086 kobject_put(&rkobj->kobj);
1087 btrfs_warn(fs_info,
1088 "failed to add kobject for block cache, ignoring");
1089 return;
1090 }
1091
1092 space_info->block_group_kobjs[index] = &rkobj->kobj;
1093 }
1094
1095 /*
1096 * Remove sysfs directories for all block group types of a given space info and
1097 * the space info as well
1098 */
1099 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
1100 {
1101 int i;
1102
1103 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1104 struct kobject *kobj;
1105
1106 kobj = space_info->block_group_kobjs[i];
1107 space_info->block_group_kobjs[i] = NULL;
1108 if (kobj) {
1109 kobject_del(kobj);
1110 kobject_put(kobj);
1111 }
1112 }
1113 kobject_del(&space_info->kobj);
1114 kobject_put(&space_info->kobj);
1115 }
1116
1117 static const char *alloc_name(u64 flags)
1118 {
1119 switch (flags) {
1120 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
1121 return "mixed";
1122 case BTRFS_BLOCK_GROUP_METADATA:
1123 return "metadata";
1124 case BTRFS_BLOCK_GROUP_DATA:
1125 return "data";
1126 case BTRFS_BLOCK_GROUP_SYSTEM:
1127 return "system";
1128 default:
1129 WARN_ON(1);
1130 return "invalid-combination";
1131 };
1132 }
1133
1134 /*
1135 * Create a sysfs entry for a space info type at path
1136 * /sys/fs/btrfs/UUID/allocation/TYPE
1137 */
1138 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
1139 struct btrfs_space_info *space_info)
1140 {
1141 int ret;
1142
1143 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
1144 fs_info->space_info_kobj, "%s",
1145 alloc_name(space_info->flags));
1146 if (ret) {
1147 kobject_put(&space_info->kobj);
1148 return ret;
1149 }
1150
1151 return 0;
1152 }
1153
1154 /* when one_device is NULL, it removes all device links */
1155
1156 int btrfs_sysfs_remove_devices_dir(struct btrfs_fs_devices *fs_devices,
1157 struct btrfs_device *one_device)
1158 {
1159 struct hd_struct *disk;
1160 struct kobject *disk_kobj;
1161
1162 if (!fs_devices->devices_kobj)
1163 return -EINVAL;
1164
1165 if (one_device) {
1166 if (one_device->bdev) {
1167 disk = one_device->bdev->bd_part;
1168 disk_kobj = &part_to_dev(disk)->kobj;
1169 sysfs_remove_link(fs_devices->devices_kobj,
1170 disk_kobj->name);
1171 }
1172
1173 kobject_del(&one_device->devid_kobj);
1174 kobject_put(&one_device->devid_kobj);
1175
1176 wait_for_completion(&one_device->kobj_unregister);
1177
1178 return 0;
1179 }
1180
1181 list_for_each_entry(one_device, &fs_devices->devices, dev_list) {
1182
1183 if (one_device->bdev) {
1184 disk = one_device->bdev->bd_part;
1185 disk_kobj = &part_to_dev(disk)->kobj;
1186 sysfs_remove_link(fs_devices->devices_kobj,
1187 disk_kobj->name);
1188 }
1189 kobject_del(&one_device->devid_kobj);
1190 kobject_put(&one_device->devid_kobj);
1191
1192 wait_for_completion(&one_device->kobj_unregister);
1193 }
1194
1195 return 0;
1196 }
1197
1198 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
1199 struct kobj_attribute *a,
1200 char *buf)
1201 {
1202 int val;
1203 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1204 devid_kobj);
1205
1206 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
1207
1208 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1209 }
1210 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
1211
1212 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
1213 struct kobj_attribute *a, char *buf)
1214 {
1215 int val;
1216 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1217 devid_kobj);
1218
1219 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
1220
1221 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1222 }
1223 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
1224
1225 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
1226 struct kobj_attribute *a,
1227 char *buf)
1228 {
1229 int val;
1230 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1231 devid_kobj);
1232
1233 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
1234
1235 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1236 }
1237 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
1238
1239 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
1240 struct kobj_attribute *a, char *buf)
1241 {
1242 int val;
1243 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1244 devid_kobj);
1245
1246 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
1247
1248 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1249 }
1250 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
1251
1252 static struct attribute *devid_attrs[] = {
1253 BTRFS_ATTR_PTR(devid, in_fs_metadata),
1254 BTRFS_ATTR_PTR(devid, missing),
1255 BTRFS_ATTR_PTR(devid, replace_target),
1256 BTRFS_ATTR_PTR(devid, writeable),
1257 NULL
1258 };
1259 ATTRIBUTE_GROUPS(devid);
1260
1261 static void btrfs_release_devid_kobj(struct kobject *kobj)
1262 {
1263 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1264 devid_kobj);
1265
1266 memset(&device->devid_kobj, 0, sizeof(struct kobject));
1267 complete(&device->kobj_unregister);
1268 }
1269
1270 static struct kobj_type devid_ktype = {
1271 .sysfs_ops = &kobj_sysfs_ops,
1272 .default_groups = devid_groups,
1273 .release = btrfs_release_devid_kobj,
1274 };
1275
1276 int btrfs_sysfs_add_devices_dir(struct btrfs_fs_devices *fs_devices,
1277 struct btrfs_device *one_device)
1278 {
1279 int error = 0;
1280 struct btrfs_device *dev;
1281 unsigned int nofs_flag;
1282
1283 nofs_flag = memalloc_nofs_save();
1284 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
1285
1286 if (one_device && one_device != dev)
1287 continue;
1288
1289 if (dev->bdev) {
1290 struct hd_struct *disk;
1291 struct kobject *disk_kobj;
1292
1293 disk = dev->bdev->bd_part;
1294 disk_kobj = &part_to_dev(disk)->kobj;
1295
1296 error = sysfs_create_link(fs_devices->devices_kobj,
1297 disk_kobj, disk_kobj->name);
1298 if (error)
1299 break;
1300 }
1301
1302 init_completion(&dev->kobj_unregister);
1303 error = kobject_init_and_add(&dev->devid_kobj, &devid_ktype,
1304 fs_devices->devinfo_kobj, "%llu",
1305 dev->devid);
1306 if (error) {
1307 kobject_put(&dev->devid_kobj);
1308 break;
1309 }
1310 }
1311 memalloc_nofs_restore(nofs_flag);
1312
1313 return error;
1314 }
1315
1316 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
1317 {
1318 int ret;
1319
1320 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
1321 if (ret)
1322 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
1323 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
1324 &disk_to_dev(bdev->bd_disk)->kobj);
1325 }
1326
1327 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices,
1328 const u8 *fsid)
1329 {
1330 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
1331
1332 /*
1333 * Sprouting changes fsid of the mounted filesystem, rename the fsid
1334 * directory
1335 */
1336 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid);
1337 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
1338 btrfs_warn(fs_devices->fs_info,
1339 "sysfs: failed to create fsid for sprout");
1340 }
1341
1342 void btrfs_sysfs_update_devid(struct btrfs_device *device)
1343 {
1344 char tmp[24];
1345
1346 snprintf(tmp, sizeof(tmp), "%llu", device->devid);
1347
1348 if (kobject_rename(&device->devid_kobj, tmp))
1349 btrfs_warn(device->fs_devices->fs_info,
1350 "sysfs: failed to update devid for %llu",
1351 device->devid);
1352 }
1353
1354 /* /sys/fs/btrfs/ entry */
1355 static struct kset *btrfs_kset;
1356
1357 /*
1358 * Creates:
1359 * /sys/fs/btrfs/UUID
1360 *
1361 * Can be called by the device discovery thread.
1362 */
1363 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
1364 {
1365 int error;
1366
1367 init_completion(&fs_devs->kobj_unregister);
1368 fs_devs->fsid_kobj.kset = btrfs_kset;
1369 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
1370 "%pU", fs_devs->fsid);
1371 if (error) {
1372 kobject_put(&fs_devs->fsid_kobj);
1373 return error;
1374 }
1375
1376 fs_devs->devices_kobj = kobject_create_and_add("devices",
1377 &fs_devs->fsid_kobj);
1378 if (!fs_devs->devices_kobj) {
1379 btrfs_err(fs_devs->fs_info,
1380 "failed to init sysfs device interface");
1381 btrfs_sysfs_remove_fsid(fs_devs);
1382 return -ENOMEM;
1383 }
1384
1385 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
1386 &fs_devs->fsid_kobj);
1387 if (!fs_devs->devinfo_kobj) {
1388 btrfs_err(fs_devs->fs_info,
1389 "failed to init sysfs devinfo kobject");
1390 btrfs_sysfs_remove_fsid(fs_devs);
1391 return -ENOMEM;
1392 }
1393
1394 return 0;
1395 }
1396
1397 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
1398 {
1399 int error;
1400 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
1401 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
1402
1403 btrfs_set_fs_info_ptr(fs_info);
1404
1405 error = btrfs_sysfs_add_devices_dir(fs_devs, NULL);
1406 if (error)
1407 return error;
1408
1409 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
1410 if (error) {
1411 btrfs_sysfs_remove_devices_dir(fs_devs, NULL);
1412 return error;
1413 }
1414
1415 error = sysfs_create_group(fsid_kobj,
1416 &btrfs_feature_attr_group);
1417 if (error)
1418 goto failure;
1419
1420 #ifdef CONFIG_BTRFS_DEBUG
1421 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
1422 if (!fs_info->debug_kobj) {
1423 error = -ENOMEM;
1424 goto failure;
1425 }
1426
1427 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1428 if (error)
1429 goto failure;
1430
1431 /* Discard directory */
1432 fs_info->discard_debug_kobj = kobject_create_and_add("discard",
1433 fs_info->debug_kobj);
1434 if (!fs_info->discard_debug_kobj) {
1435 error = -ENOMEM;
1436 goto failure;
1437 }
1438
1439 error = sysfs_create_files(fs_info->discard_debug_kobj,
1440 discard_debug_attrs);
1441 if (error)
1442 goto failure;
1443 #endif
1444
1445 error = addrm_unknown_feature_attrs(fs_info, true);
1446 if (error)
1447 goto failure;
1448
1449 error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
1450 if (error)
1451 goto failure;
1452
1453 fs_info->space_info_kobj = kobject_create_and_add("allocation",
1454 fsid_kobj);
1455 if (!fs_info->space_info_kobj) {
1456 error = -ENOMEM;
1457 goto failure;
1458 }
1459
1460 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
1461 if (error)
1462 goto failure;
1463
1464 return 0;
1465 failure:
1466 btrfs_sysfs_remove_mounted(fs_info);
1467 return error;
1468 }
1469
1470 static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
1471 {
1472 return to_fs_info(kobj->parent->parent);
1473 }
1474
1475 #define QGROUP_ATTR(_member, _show_name) \
1476 static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
1477 struct kobj_attribute *a, \
1478 char *buf) \
1479 { \
1480 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1481 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1482 struct btrfs_qgroup, kobj); \
1483 return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
1484 } \
1485 BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
1486
1487 #define QGROUP_RSV_ATTR(_name, _type) \
1488 static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
1489 struct kobj_attribute *a, \
1490 char *buf) \
1491 { \
1492 struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
1493 struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
1494 struct btrfs_qgroup, kobj); \
1495 return btrfs_show_u64(&qgroup->rsv.values[_type], \
1496 &fs_info->qgroup_lock, buf); \
1497 } \
1498 BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
1499
1500 QGROUP_ATTR(rfer, referenced);
1501 QGROUP_ATTR(excl, exclusive);
1502 QGROUP_ATTR(max_rfer, max_referenced);
1503 QGROUP_ATTR(max_excl, max_exclusive);
1504 QGROUP_ATTR(lim_flags, limit_flags);
1505 QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
1506 QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
1507 QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
1508
1509 static struct attribute *qgroup_attrs[] = {
1510 BTRFS_ATTR_PTR(qgroup, referenced),
1511 BTRFS_ATTR_PTR(qgroup, exclusive),
1512 BTRFS_ATTR_PTR(qgroup, max_referenced),
1513 BTRFS_ATTR_PTR(qgroup, max_exclusive),
1514 BTRFS_ATTR_PTR(qgroup, limit_flags),
1515 BTRFS_ATTR_PTR(qgroup, rsv_data),
1516 BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
1517 BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
1518 NULL
1519 };
1520 ATTRIBUTE_GROUPS(qgroup);
1521
1522 static void qgroup_release(struct kobject *kobj)
1523 {
1524 struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
1525
1526 memset(&qgroup->kobj, 0, sizeof(*kobj));
1527 }
1528
1529 static struct kobj_type qgroup_ktype = {
1530 .sysfs_ops = &kobj_sysfs_ops,
1531 .release = qgroup_release,
1532 .default_groups = qgroup_groups,
1533 };
1534
1535 int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
1536 struct btrfs_qgroup *qgroup)
1537 {
1538 struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
1539 int ret;
1540
1541 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1542 return 0;
1543 if (qgroup->kobj.state_initialized)
1544 return 0;
1545 if (!qgroups_kobj)
1546 return -EINVAL;
1547
1548 ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
1549 "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
1550 btrfs_qgroup_subvolid(qgroup->qgroupid));
1551 if (ret < 0)
1552 kobject_put(&qgroup->kobj);
1553
1554 return ret;
1555 }
1556
1557 void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
1558 {
1559 struct btrfs_qgroup *qgroup;
1560 struct btrfs_qgroup *next;
1561
1562 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1563 return;
1564
1565 rbtree_postorder_for_each_entry_safe(qgroup, next,
1566 &fs_info->qgroup_tree, node)
1567 btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
1568 if (fs_info->qgroups_kobj) {
1569 kobject_del(fs_info->qgroups_kobj);
1570 kobject_put(fs_info->qgroups_kobj);
1571 fs_info->qgroups_kobj = NULL;
1572 }
1573 }
1574
1575 /* Called when qgroups get initialized, thus there is no need for locking */
1576 int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
1577 {
1578 struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1579 struct btrfs_qgroup *qgroup;
1580 struct btrfs_qgroup *next;
1581 int ret = 0;
1582
1583 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1584 return 0;
1585
1586 ASSERT(fsid_kobj);
1587 if (fs_info->qgroups_kobj)
1588 return 0;
1589
1590 fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj);
1591 if (!fs_info->qgroups_kobj) {
1592 ret = -ENOMEM;
1593 goto out;
1594 }
1595 rbtree_postorder_for_each_entry_safe(qgroup, next,
1596 &fs_info->qgroup_tree, node) {
1597 ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
1598 if (ret < 0)
1599 goto out;
1600 }
1601
1602 out:
1603 if (ret < 0)
1604 btrfs_sysfs_del_qgroups(fs_info);
1605 return ret;
1606 }
1607
1608 void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
1609 struct btrfs_qgroup *qgroup)
1610 {
1611 if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
1612 return;
1613
1614 if (qgroup->kobj.state_initialized) {
1615 kobject_del(&qgroup->kobj);
1616 kobject_put(&qgroup->kobj);
1617 }
1618 }
1619
1620 /*
1621 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
1622 * values in superblock. Call after any changes to incompat/compat_ro flags
1623 */
1624 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
1625 u64 bit, enum btrfs_feature_set set)
1626 {
1627 struct btrfs_fs_devices *fs_devs;
1628 struct kobject *fsid_kobj;
1629 u64 features;
1630 int ret;
1631
1632 if (!fs_info)
1633 return;
1634
1635 features = get_features(fs_info, set);
1636 ASSERT(bit & supported_feature_masks[set]);
1637
1638 fs_devs = fs_info->fs_devices;
1639 fsid_kobj = &fs_devs->fsid_kobj;
1640
1641 if (!fsid_kobj->state_initialized)
1642 return;
1643
1644 /*
1645 * FIXME: this is too heavy to update just one value, ideally we'd like
1646 * to use sysfs_update_group but some refactoring is needed first.
1647 */
1648 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1649 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
1650 }
1651
1652 int __init btrfs_init_sysfs(void)
1653 {
1654 int ret;
1655
1656 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
1657 if (!btrfs_kset)
1658 return -ENOMEM;
1659
1660 init_feature_attrs();
1661 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1662 if (ret)
1663 goto out2;
1664 ret = sysfs_merge_group(&btrfs_kset->kobj,
1665 &btrfs_static_feature_attr_group);
1666 if (ret)
1667 goto out_remove_group;
1668
1669 #ifdef CONFIG_BTRFS_DEBUG
1670 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1671 if (ret)
1672 goto out2;
1673 #endif
1674
1675 return 0;
1676
1677 out_remove_group:
1678 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1679 out2:
1680 kset_unregister(btrfs_kset);
1681
1682 return ret;
1683 }
1684
1685 void __cold btrfs_exit_sysfs(void)
1686 {
1687 sysfs_unmerge_group(&btrfs_kset->kobj,
1688 &btrfs_static_feature_attr_group);
1689 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1690 #ifdef CONFIG_BTRFS_DEBUG
1691 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1692 #endif
1693 kset_unregister(btrfs_kset);
1694 }
1695
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