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usb: typec: intel_pmc_mux: Add support for USB4
[linux/fpc-iii.git] / fs / btrfs / sysfs.c
bloba39bff64ff24edfc13fee709b8510e2c66c8c524
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 scnprintf(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 scnprintf(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 += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
314 (i == 0 ? "" : " "), btrfs_super_csum_name(i));
315
316 }
317
318 ret += scnprintf(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_bytes_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 scnprintf(buf, PAGE_SIZE, "%lld\n",
354 atomic64_read(&fs_info->discard_ctl.discardable_bytes));
355 }
356 BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
357
358 static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
359 struct kobj_attribute *a,
360 char *buf)
361 {
362 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
363
364 return scnprintf(buf, PAGE_SIZE, "%d\n",
365 atomic_read(&fs_info->discard_ctl.discardable_extents));
366 }
367 BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
368
369 static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
370 struct kobj_attribute *a,
371 char *buf)
372 {
373 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
374
375 return scnprintf(buf, PAGE_SIZE, "%lld\n",
376 fs_info->discard_ctl.discard_bitmap_bytes);
377 }
378 BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
379
380 static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
381 struct kobj_attribute *a,
382 char *buf)
383 {
384 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
385
386 return scnprintf(buf, PAGE_SIZE, "%lld\n",
387 atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
388 }
389 BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
390
391 static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
392 struct kobj_attribute *a,
393 char *buf)
394 {
395 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
396
397 return scnprintf(buf, PAGE_SIZE, "%lld\n",
398 fs_info->discard_ctl.discard_extent_bytes);
399 }
400 BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
401
402 static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
403 struct kobj_attribute *a,
404 char *buf)
405 {
406 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
407
408 return scnprintf(buf, PAGE_SIZE, "%u\n",
409 READ_ONCE(fs_info->discard_ctl.iops_limit));
410 }
411
412 static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
413 struct kobj_attribute *a,
414 const char *buf, size_t len)
415 {
416 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
417 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
418 u32 iops_limit;
419 int ret;
420
421 ret = kstrtou32(buf, 10, &iops_limit);
422 if (ret)
423 return -EINVAL;
424
425 WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
426
427 return len;
428 }
429 BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
430 btrfs_discard_iops_limit_store);
431
432 static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
433 struct kobj_attribute *a,
434 char *buf)
435 {
436 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
437
438 return scnprintf(buf, PAGE_SIZE, "%u\n",
439 READ_ONCE(fs_info->discard_ctl.kbps_limit));
440 }
441
442 static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
443 struct kobj_attribute *a,
444 const char *buf, size_t len)
445 {
446 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
447 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
448 u32 kbps_limit;
449 int ret;
450
451 ret = kstrtou32(buf, 10, &kbps_limit);
452 if (ret)
453 return -EINVAL;
454
455 WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
456
457 return len;
458 }
459 BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
460 btrfs_discard_kbps_limit_store);
461
462 static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
463 struct kobj_attribute *a,
464 char *buf)
465 {
466 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
467
468 return scnprintf(buf, PAGE_SIZE, "%llu\n",
469 READ_ONCE(fs_info->discard_ctl.max_discard_size));
470 }
471
472 static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
473 struct kobj_attribute *a,
474 const char *buf, size_t len)
475 {
476 struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
477 struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
478 u64 max_discard_size;
479 int ret;
480
481 ret = kstrtou64(buf, 10, &max_discard_size);
482 if (ret)
483 return -EINVAL;
484
485 WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
486
487 return len;
488 }
489 BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
490 btrfs_discard_max_discard_size_store);
491
492 static const struct attribute *discard_debug_attrs[] = {
493 BTRFS_ATTR_PTR(discard, discardable_bytes),
494 BTRFS_ATTR_PTR(discard, discardable_extents),
495 BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
496 BTRFS_ATTR_PTR(discard, discard_bytes_saved),
497 BTRFS_ATTR_PTR(discard, discard_extent_bytes),
498 BTRFS_ATTR_PTR(discard, iops_limit),
499 BTRFS_ATTR_PTR(discard, kbps_limit),
500 BTRFS_ATTR_PTR(discard, max_discard_size),
501 NULL,
502 };
503
504 /*
505 * Runtime debugging exported via sysfs
506 *
507 * /sys/fs/btrfs/debug - applies to module or all filesystems
508 * /sys/fs/btrfs/UUID - applies only to the given filesystem
509 */
510 static const struct attribute *btrfs_debug_mount_attrs[] = {
511 NULL,
512 };
513
514 static struct attribute *btrfs_debug_feature_attrs[] = {
515 NULL
516 };
517
518 static const struct attribute_group btrfs_debug_feature_attr_group = {
519 .name = "debug",
520 .attrs = btrfs_debug_feature_attrs,
521 };
522
523 #endif
524
525 static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
526 {
527 u64 val;
528 if (lock)
529 spin_lock(lock);
530 val = *value_ptr;
531 if (lock)
532 spin_unlock(lock);
533 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
534 }
535
536 static ssize_t global_rsv_size_show(struct kobject *kobj,
537 struct kobj_attribute *ka, char *buf)
538 {
539 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
540 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
541 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
542 }
543 BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
544
545 static ssize_t global_rsv_reserved_show(struct kobject *kobj,
546 struct kobj_attribute *a, char *buf)
547 {
548 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
549 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
550 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
551 }
552 BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
553
554 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
555 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
556
557 static ssize_t raid_bytes_show(struct kobject *kobj,
558 struct kobj_attribute *attr, char *buf);
559 BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
560 BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
561
562 static ssize_t raid_bytes_show(struct kobject *kobj,
563 struct kobj_attribute *attr, char *buf)
564
565 {
566 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
567 struct btrfs_block_group *block_group;
568 int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
569 u64 val = 0;
570
571 down_read(&sinfo->groups_sem);
572 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
573 if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
574 val += block_group->length;
575 else
576 val += block_group->used;
577 }
578 up_read(&sinfo->groups_sem);
579 return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
580 }
581
582 static struct attribute *raid_attrs[] = {
583 BTRFS_ATTR_PTR(raid, total_bytes),
584 BTRFS_ATTR_PTR(raid, used_bytes),
585 NULL
586 };
587 ATTRIBUTE_GROUPS(raid);
588
589 static void release_raid_kobj(struct kobject *kobj)
590 {
591 kfree(to_raid_kobj(kobj));
592 }
593
594 static struct kobj_type btrfs_raid_ktype = {
595 .sysfs_ops = &kobj_sysfs_ops,
596 .release = release_raid_kobj,
597 .default_groups = raid_groups,
598 };
599
600 #define SPACE_INFO_ATTR(field) \
601 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
602 struct kobj_attribute *a, \
603 char *buf) \
604 { \
605 struct btrfs_space_info *sinfo = to_space_info(kobj); \
606 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
607 } \
608 BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
609
610 static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
611 struct kobj_attribute *a,
612 char *buf)
613 {
614 struct btrfs_space_info *sinfo = to_space_info(kobj);
615 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
616 return scnprintf(buf, PAGE_SIZE, "%lld\n", val);
617 }
618
619 SPACE_INFO_ATTR(flags);
620 SPACE_INFO_ATTR(total_bytes);
621 SPACE_INFO_ATTR(bytes_used);
622 SPACE_INFO_ATTR(bytes_pinned);
623 SPACE_INFO_ATTR(bytes_reserved);
624 SPACE_INFO_ATTR(bytes_may_use);
625 SPACE_INFO_ATTR(bytes_readonly);
626 SPACE_INFO_ATTR(disk_used);
627 SPACE_INFO_ATTR(disk_total);
628 BTRFS_ATTR(space_info, total_bytes_pinned,
629 btrfs_space_info_show_total_bytes_pinned);
630
631 static struct attribute *space_info_attrs[] = {
632 BTRFS_ATTR_PTR(space_info, flags),
633 BTRFS_ATTR_PTR(space_info, total_bytes),
634 BTRFS_ATTR_PTR(space_info, bytes_used),
635 BTRFS_ATTR_PTR(space_info, bytes_pinned),
636 BTRFS_ATTR_PTR(space_info, bytes_reserved),
637 BTRFS_ATTR_PTR(space_info, bytes_may_use),
638 BTRFS_ATTR_PTR(space_info, bytes_readonly),
639 BTRFS_ATTR_PTR(space_info, disk_used),
640 BTRFS_ATTR_PTR(space_info, disk_total),
641 BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
642 NULL,
643 };
644 ATTRIBUTE_GROUPS(space_info);
645
646 static void space_info_release(struct kobject *kobj)
647 {
648 struct btrfs_space_info *sinfo = to_space_info(kobj);
649 percpu_counter_destroy(&sinfo->total_bytes_pinned);
650 kfree(sinfo);
651 }
652
653 static struct kobj_type space_info_ktype = {
654 .sysfs_ops = &kobj_sysfs_ops,
655 .release = space_info_release,
656 .default_groups = space_info_groups,
657 };
658
659 static const struct attribute *allocation_attrs[] = {
660 BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
661 BTRFS_ATTR_PTR(allocation, global_rsv_size),
662 NULL,
663 };
664
665 static ssize_t btrfs_label_show(struct kobject *kobj,
666 struct kobj_attribute *a, char *buf)
667 {
668 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
669 char *label = fs_info->super_copy->label;
670 ssize_t ret;
671
672 spin_lock(&fs_info->super_lock);
673 ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
674 spin_unlock(&fs_info->super_lock);
675
676 return ret;
677 }
678
679 static ssize_t btrfs_label_store(struct kobject *kobj,
680 struct kobj_attribute *a,
681 const char *buf, size_t len)
682 {
683 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
684 size_t p_len;
685
686 if (!fs_info)
687 return -EPERM;
688
689 if (sb_rdonly(fs_info->sb))
690 return -EROFS;
691
692 /*
693 * p_len is the len until the first occurrence of either
694 * '\n' or '\0'
695 */
696 p_len = strcspn(buf, "\n");
697
698 if (p_len >= BTRFS_LABEL_SIZE)
699 return -EINVAL;
700
701 spin_lock(&fs_info->super_lock);
702 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
703 memcpy(fs_info->super_copy->label, buf, p_len);
704 spin_unlock(&fs_info->super_lock);
705
706 /*
707 * We don't want to do full transaction commit from inside sysfs
708 */
709 btrfs_set_pending(fs_info, COMMIT);
710 wake_up_process(fs_info->transaction_kthread);
711
712 return len;
713 }
714 BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
715
716 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
717 struct kobj_attribute *a, char *buf)
718 {
719 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
720
721 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
722 }
723
724 BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
725
726 static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
727 struct kobj_attribute *a, char *buf)
728 {
729 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
730
731 return scnprintf(buf, PAGE_SIZE, "%u\n",
732 fs_info->super_copy->sectorsize);
733 }
734
735 BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
736
737 static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
738 struct kobj_attribute *a, char *buf)
739 {
740 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
741
742 return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
743 }
744
745 BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
746
747 static ssize_t quota_override_show(struct kobject *kobj,
748 struct kobj_attribute *a, char *buf)
749 {
750 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
751 int quota_override;
752
753 quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
754 return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override);
755 }
756
757 static ssize_t quota_override_store(struct kobject *kobj,
758 struct kobj_attribute *a,
759 const char *buf, size_t len)
760 {
761 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
762 unsigned long knob;
763 int err;
764
765 if (!fs_info)
766 return -EPERM;
767
768 if (!capable(CAP_SYS_RESOURCE))
769 return -EPERM;
770
771 err = kstrtoul(buf, 10, &knob);
772 if (err)
773 return err;
774 if (knob > 1)
775 return -EINVAL;
776
777 if (knob)
778 set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
779 else
780 clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
781
782 return len;
783 }
784
785 BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
786
787 static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
788 struct kobj_attribute *a, char *buf)
789 {
790 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
791
792 return scnprintf(buf, PAGE_SIZE, "%pU\n",
793 fs_info->fs_devices->metadata_uuid);
794 }
795
796 BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
797
798 static ssize_t btrfs_checksum_show(struct kobject *kobj,
799 struct kobj_attribute *a, char *buf)
800 {
801 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
802 u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
803
804 return scnprintf(buf, PAGE_SIZE, "%s (%s)\n",
805 btrfs_super_csum_name(csum_type),
806 crypto_shash_driver_name(fs_info->csum_shash));
807 }
808
809 BTRFS_ATTR(, checksum, btrfs_checksum_show);
810
811 static const struct attribute *btrfs_attrs[] = {
812 BTRFS_ATTR_PTR(, label),
813 BTRFS_ATTR_PTR(, nodesize),
814 BTRFS_ATTR_PTR(, sectorsize),
815 BTRFS_ATTR_PTR(, clone_alignment),
816 BTRFS_ATTR_PTR(, quota_override),
817 BTRFS_ATTR_PTR(, metadata_uuid),
818 BTRFS_ATTR_PTR(, checksum),
819 NULL,
820 };
821
822 static void btrfs_release_fsid_kobj(struct kobject *kobj)
823 {
824 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
825
826 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
827 complete(&fs_devs->kobj_unregister);
828 }
829
830 static struct kobj_type btrfs_ktype = {
831 .sysfs_ops = &kobj_sysfs_ops,
832 .release = btrfs_release_fsid_kobj,
833 };
834
835 static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
836 {
837 if (kobj->ktype != &btrfs_ktype)
838 return NULL;
839 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
840 }
841
842 static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
843 {
844 if (kobj->ktype != &btrfs_ktype)
845 return NULL;
846 return to_fs_devs(kobj)->fs_info;
847 }
848
849 #define NUM_FEATURE_BITS 64
850 #define BTRFS_FEATURE_NAME_MAX 13
851 static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
852 static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
853
854 static const u64 supported_feature_masks[FEAT_MAX] = {
855 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
856 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
857 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
858 };
859
860 static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
861 {
862 int set;
863
864 for (set = 0; set < FEAT_MAX; set++) {
865 int i;
866 struct attribute *attrs[2];
867 struct attribute_group agroup = {
868 .name = "features",
869 .attrs = attrs,
870 };
871 u64 features = get_features(fs_info, set);
872 features &= ~supported_feature_masks[set];
873
874 if (!features)
875 continue;
876
877 attrs[1] = NULL;
878 for (i = 0; i < NUM_FEATURE_BITS; i++) {
879 struct btrfs_feature_attr *fa;
880
881 if (!(features & (1ULL << i)))
882 continue;
883
884 fa = &btrfs_feature_attrs[set][i];
885 attrs[0] = &fa->kobj_attr.attr;
886 if (add) {
887 int ret;
888 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
889 &agroup);
890 if (ret)
891 return ret;
892 } else
893 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
894 &agroup);
895 }
896
897 }
898 return 0;
899 }
900
901 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
902 {
903 if (fs_devs->devinfo_kobj) {
904 kobject_del(fs_devs->devinfo_kobj);
905 kobject_put(fs_devs->devinfo_kobj);
906 fs_devs->devinfo_kobj = NULL;
907 }
908
909 if (fs_devs->devices_kobj) {
910 kobject_del(fs_devs->devices_kobj);
911 kobject_put(fs_devs->devices_kobj);
912 fs_devs->devices_kobj = NULL;
913 }
914
915 if (fs_devs->fsid_kobj.state_initialized) {
916 kobject_del(&fs_devs->fsid_kobj);
917 kobject_put(&fs_devs->fsid_kobj);
918 wait_for_completion(&fs_devs->kobj_unregister);
919 }
920 }
921
922 /* when fs_devs is NULL it will remove all fsid kobject */
923 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
924 {
925 struct list_head *fs_uuids = btrfs_get_fs_uuids();
926
927 if (fs_devs) {
928 __btrfs_sysfs_remove_fsid(fs_devs);
929 return;
930 }
931
932 list_for_each_entry(fs_devs, fs_uuids, fs_list) {
933 __btrfs_sysfs_remove_fsid(fs_devs);
934 }
935 }
936
937 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
938 {
939 btrfs_reset_fs_info_ptr(fs_info);
940
941 if (fs_info->space_info_kobj) {
942 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
943 kobject_del(fs_info->space_info_kobj);
944 kobject_put(fs_info->space_info_kobj);
945 }
946 #ifdef CONFIG_BTRFS_DEBUG
947 if (fs_info->discard_debug_kobj) {
948 sysfs_remove_files(fs_info->discard_debug_kobj,
949 discard_debug_attrs);
950 kobject_del(fs_info->discard_debug_kobj);
951 kobject_put(fs_info->discard_debug_kobj);
952 }
953 if (fs_info->debug_kobj) {
954 sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
955 kobject_del(fs_info->debug_kobj);
956 kobject_put(fs_info->debug_kobj);
957 }
958 #endif
959 addrm_unknown_feature_attrs(fs_info, false);
960 sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group);
961 sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs);
962 btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, NULL);
963 }
964
965 static const char * const btrfs_feature_set_names[FEAT_MAX] = {
966 [FEAT_COMPAT] = "compat",
967 [FEAT_COMPAT_RO] = "compat_ro",
968 [FEAT_INCOMPAT] = "incompat",
969 };
970
971 const char * const btrfs_feature_set_name(enum btrfs_feature_set set)
972 {
973 return btrfs_feature_set_names[set];
974 }
975
976 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
977 {
978 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
979 int len = 0;
980 int i;
981 char *str;
982
983 str = kmalloc(bufsize, GFP_KERNEL);
984 if (!str)
985 return str;
986
987 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
988 const char *name;
989
990 if (!(flags & (1ULL << i)))
991 continue;
992
993 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
994 len += scnprintf(str + len, bufsize - len, "%s%s",
995 len ? "," : "", name);
996 }
997
998 return str;
999 }
1000
1001 static void init_feature_attrs(void)
1002 {
1003 struct btrfs_feature_attr *fa;
1004 int set, i;
1005
1006 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
1007 ARRAY_SIZE(btrfs_feature_attrs));
1008 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
1009 ARRAY_SIZE(btrfs_feature_attrs[0]));
1010
1011 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
1012 memset(btrfs_unknown_feature_names, 0,
1013 sizeof(btrfs_unknown_feature_names));
1014
1015 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
1016 struct btrfs_feature_attr *sfa;
1017 struct attribute *a = btrfs_supported_feature_attrs[i];
1018 int bit;
1019 sfa = attr_to_btrfs_feature_attr(a);
1020 bit = ilog2(sfa->feature_bit);
1021 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
1022
1023 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
1024 }
1025
1026 for (set = 0; set < FEAT_MAX; set++) {
1027 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1028 char *name = btrfs_unknown_feature_names[set][i];
1029 fa = &btrfs_feature_attrs[set][i];
1030
1031 if (fa->kobj_attr.attr.name)
1032 continue;
1033
1034 snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
1035 btrfs_feature_set_names[set], i);
1036
1037 fa->kobj_attr.attr.name = name;
1038 fa->kobj_attr.attr.mode = S_IRUGO;
1039 fa->feature_set = set;
1040 fa->feature_bit = 1ULL << i;
1041 }
1042 }
1043 }
1044
1045 /*
1046 * Create a sysfs entry for a given block group type at path
1047 * /sys/fs/btrfs/UUID/allocation/data/TYPE
1048 */
1049 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
1050 {
1051 struct btrfs_fs_info *fs_info = cache->fs_info;
1052 struct btrfs_space_info *space_info = cache->space_info;
1053 struct raid_kobject *rkobj;
1054 const int index = btrfs_bg_flags_to_raid_index(cache->flags);
1055 unsigned int nofs_flag;
1056 int ret;
1057
1058 /*
1059 * Setup a NOFS context because kobject_add(), deep in its call chain,
1060 * does GFP_KERNEL allocations, and we are often called in a context
1061 * where if reclaim is triggered we can deadlock (we are either holding
1062 * a transaction handle or some lock required for a transaction
1063 * commit).
1064 */
1065 nofs_flag = memalloc_nofs_save();
1066
1067 rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
1068 if (!rkobj) {
1069 memalloc_nofs_restore(nofs_flag);
1070 btrfs_warn(cache->fs_info,
1071 "couldn't alloc memory for raid level kobject");
1072 return;
1073 }
1074
1075 rkobj->flags = cache->flags;
1076 kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
1077 ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
1078 btrfs_bg_type_to_raid_name(rkobj->flags));
1079 memalloc_nofs_restore(nofs_flag);
1080 if (ret) {
1081 kobject_put(&rkobj->kobj);
1082 btrfs_warn(fs_info,
1083 "failed to add kobject for block cache, ignoring");
1084 return;
1085 }
1086
1087 space_info->block_group_kobjs[index] = &rkobj->kobj;
1088 }
1089
1090 /*
1091 * Remove sysfs directories for all block group types of a given space info and
1092 * the space info as well
1093 */
1094 void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
1095 {
1096 int i;
1097
1098 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1099 struct kobject *kobj;
1100
1101 kobj = space_info->block_group_kobjs[i];
1102 space_info->block_group_kobjs[i] = NULL;
1103 if (kobj) {
1104 kobject_del(kobj);
1105 kobject_put(kobj);
1106 }
1107 }
1108 kobject_del(&space_info->kobj);
1109 kobject_put(&space_info->kobj);
1110 }
1111
1112 static const char *alloc_name(u64 flags)
1113 {
1114 switch (flags) {
1115 case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
1116 return "mixed";
1117 case BTRFS_BLOCK_GROUP_METADATA:
1118 return "metadata";
1119 case BTRFS_BLOCK_GROUP_DATA:
1120 return "data";
1121 case BTRFS_BLOCK_GROUP_SYSTEM:
1122 return "system";
1123 default:
1124 WARN_ON(1);
1125 return "invalid-combination";
1126 };
1127 }
1128
1129 /*
1130 * Create a sysfs entry for a space info type at path
1131 * /sys/fs/btrfs/UUID/allocation/TYPE
1132 */
1133 int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
1134 struct btrfs_space_info *space_info)
1135 {
1136 int ret;
1137
1138 ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
1139 fs_info->space_info_kobj, "%s",
1140 alloc_name(space_info->flags));
1141 if (ret) {
1142 kobject_put(&space_info->kobj);
1143 return ret;
1144 }
1145
1146 return 0;
1147 }
1148
1149 /* when one_device is NULL, it removes all device links */
1150
1151 int btrfs_sysfs_remove_devices_dir(struct btrfs_fs_devices *fs_devices,
1152 struct btrfs_device *one_device)
1153 {
1154 struct hd_struct *disk;
1155 struct kobject *disk_kobj;
1156
1157 if (!fs_devices->devices_kobj)
1158 return -EINVAL;
1159
1160 if (one_device) {
1161 if (one_device->bdev) {
1162 disk = one_device->bdev->bd_part;
1163 disk_kobj = &part_to_dev(disk)->kobj;
1164 sysfs_remove_link(fs_devices->devices_kobj,
1165 disk_kobj->name);
1166 }
1167
1168 kobject_del(&one_device->devid_kobj);
1169 kobject_put(&one_device->devid_kobj);
1170
1171 wait_for_completion(&one_device->kobj_unregister);
1172
1173 return 0;
1174 }
1175
1176 list_for_each_entry(one_device, &fs_devices->devices, dev_list) {
1177
1178 if (one_device->bdev) {
1179 disk = one_device->bdev->bd_part;
1180 disk_kobj = &part_to_dev(disk)->kobj;
1181 sysfs_remove_link(fs_devices->devices_kobj,
1182 disk_kobj->name);
1183 }
1184 kobject_del(&one_device->devid_kobj);
1185 kobject_put(&one_device->devid_kobj);
1186
1187 wait_for_completion(&one_device->kobj_unregister);
1188 }
1189
1190 return 0;
1191 }
1192
1193 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
1194 struct kobj_attribute *a,
1195 char *buf)
1196 {
1197 int val;
1198 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1199 devid_kobj);
1200
1201 val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
1202
1203 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1204 }
1205 BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
1206
1207 static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
1208 struct kobj_attribute *a, char *buf)
1209 {
1210 int val;
1211 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1212 devid_kobj);
1213
1214 val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
1215
1216 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1217 }
1218 BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
1219
1220 static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
1221 struct kobj_attribute *a,
1222 char *buf)
1223 {
1224 int val;
1225 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1226 devid_kobj);
1227
1228 val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
1229
1230 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1231 }
1232 BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
1233
1234 static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
1235 struct kobj_attribute *a, char *buf)
1236 {
1237 int val;
1238 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1239 devid_kobj);
1240
1241 val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
1242
1243 return scnprintf(buf, PAGE_SIZE, "%d\n", val);
1244 }
1245 BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
1246
1247 static struct attribute *devid_attrs[] = {
1248 BTRFS_ATTR_PTR(devid, in_fs_metadata),
1249 BTRFS_ATTR_PTR(devid, missing),
1250 BTRFS_ATTR_PTR(devid, replace_target),
1251 BTRFS_ATTR_PTR(devid, writeable),
1252 NULL
1253 };
1254 ATTRIBUTE_GROUPS(devid);
1255
1256 static void btrfs_release_devid_kobj(struct kobject *kobj)
1257 {
1258 struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1259 devid_kobj);
1260
1261 memset(&device->devid_kobj, 0, sizeof(struct kobject));
1262 complete(&device->kobj_unregister);
1263 }
1264
1265 static struct kobj_type devid_ktype = {
1266 .sysfs_ops = &kobj_sysfs_ops,
1267 .default_groups = devid_groups,
1268 .release = btrfs_release_devid_kobj,
1269 };
1270
1271 int btrfs_sysfs_add_devices_dir(struct btrfs_fs_devices *fs_devices,
1272 struct btrfs_device *one_device)
1273 {
1274 int error = 0;
1275 struct btrfs_device *dev;
1276
1277 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
1278
1279 if (one_device && one_device != dev)
1280 continue;
1281
1282 if (dev->bdev) {
1283 struct hd_struct *disk;
1284 struct kobject *disk_kobj;
1285
1286 disk = dev->bdev->bd_part;
1287 disk_kobj = &part_to_dev(disk)->kobj;
1288
1289 error = sysfs_create_link(fs_devices->devices_kobj,
1290 disk_kobj, disk_kobj->name);
1291 if (error)
1292 break;
1293 }
1294
1295 init_completion(&dev->kobj_unregister);
1296 error = kobject_init_and_add(&dev->devid_kobj, &devid_ktype,
1297 fs_devices->devinfo_kobj, "%llu",
1298 dev->devid);
1299 if (error) {
1300 kobject_put(&dev->devid_kobj);
1301 break;
1302 }
1303 }
1304
1305 return error;
1306 }
1307
1308 void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
1309 {
1310 int ret;
1311
1312 ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
1313 if (ret)
1314 pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
1315 action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
1316 &disk_to_dev(bdev->bd_disk)->kobj);
1317 }
1318
1319 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices,
1320 const u8 *fsid)
1321 {
1322 char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
1323
1324 /*
1325 * Sprouting changes fsid of the mounted filesystem, rename the fsid
1326 * directory
1327 */
1328 snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid);
1329 if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
1330 btrfs_warn(fs_devices->fs_info,
1331 "sysfs: failed to create fsid for sprout");
1332 }
1333
1334 void btrfs_sysfs_update_devid(struct btrfs_device *device)
1335 {
1336 char tmp[24];
1337
1338 snprintf(tmp, sizeof(tmp), "%llu", device->devid);
1339
1340 if (kobject_rename(&device->devid_kobj, tmp))
1341 btrfs_warn(device->fs_devices->fs_info,
1342 "sysfs: failed to update devid for %llu",
1343 device->devid);
1344 }
1345
1346 /* /sys/fs/btrfs/ entry */
1347 static struct kset *btrfs_kset;
1348
1349 /*
1350 * Creates:
1351 * /sys/fs/btrfs/UUID
1352 *
1353 * Can be called by the device discovery thread.
1354 */
1355 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
1356 {
1357 int error;
1358
1359 init_completion(&fs_devs->kobj_unregister);
1360 fs_devs->fsid_kobj.kset = btrfs_kset;
1361 error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
1362 "%pU", fs_devs->fsid);
1363 if (error) {
1364 kobject_put(&fs_devs->fsid_kobj);
1365 return error;
1366 }
1367
1368 fs_devs->devices_kobj = kobject_create_and_add("devices",
1369 &fs_devs->fsid_kobj);
1370 if (!fs_devs->devices_kobj) {
1371 btrfs_err(fs_devs->fs_info,
1372 "failed to init sysfs device interface");
1373 btrfs_sysfs_remove_fsid(fs_devs);
1374 return -ENOMEM;
1375 }
1376
1377 fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
1378 &fs_devs->fsid_kobj);
1379 if (!fs_devs->devinfo_kobj) {
1380 btrfs_err(fs_devs->fs_info,
1381 "failed to init sysfs devinfo kobject");
1382 btrfs_sysfs_remove_fsid(fs_devs);
1383 return -ENOMEM;
1384 }
1385
1386 return 0;
1387 }
1388
1389 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
1390 {
1391 int error;
1392 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
1393 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
1394
1395 btrfs_set_fs_info_ptr(fs_info);
1396
1397 error = btrfs_sysfs_add_devices_dir(fs_devs, NULL);
1398 if (error)
1399 return error;
1400
1401 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
1402 if (error) {
1403 btrfs_sysfs_remove_devices_dir(fs_devs, NULL);
1404 return error;
1405 }
1406
1407 error = sysfs_create_group(fsid_kobj,
1408 &btrfs_feature_attr_group);
1409 if (error)
1410 goto failure;
1411
1412 #ifdef CONFIG_BTRFS_DEBUG
1413 fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
1414 if (!fs_info->debug_kobj) {
1415 error = -ENOMEM;
1416 goto failure;
1417 }
1418
1419 error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1420 if (error)
1421 goto failure;
1422
1423 /* Discard directory */
1424 fs_info->discard_debug_kobj = kobject_create_and_add("discard",
1425 fs_info->debug_kobj);
1426 if (!fs_info->discard_debug_kobj) {
1427 error = -ENOMEM;
1428 goto failure;
1429 }
1430
1431 error = sysfs_create_files(fs_info->discard_debug_kobj,
1432 discard_debug_attrs);
1433 if (error)
1434 goto failure;
1435 #endif
1436
1437 error = addrm_unknown_feature_attrs(fs_info, true);
1438 if (error)
1439 goto failure;
1440
1441 fs_info->space_info_kobj = kobject_create_and_add("allocation",
1442 fsid_kobj);
1443 if (!fs_info->space_info_kobj) {
1444 error = -ENOMEM;
1445 goto failure;
1446 }
1447
1448 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
1449 if (error)
1450 goto failure;
1451
1452 return 0;
1453 failure:
1454 btrfs_sysfs_remove_mounted(fs_info);
1455 return error;
1456 }
1457
1458
1459 /*
1460 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
1461 * values in superblock. Call after any changes to incompat/compat_ro flags
1462 */
1463 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
1464 u64 bit, enum btrfs_feature_set set)
1465 {
1466 struct btrfs_fs_devices *fs_devs;
1467 struct kobject *fsid_kobj;
1468 u64 features;
1469 int ret;
1470
1471 if (!fs_info)
1472 return;
1473
1474 features = get_features(fs_info, set);
1475 ASSERT(bit & supported_feature_masks[set]);
1476
1477 fs_devs = fs_info->fs_devices;
1478 fsid_kobj = &fs_devs->fsid_kobj;
1479
1480 if (!fsid_kobj->state_initialized)
1481 return;
1482
1483 /*
1484 * FIXME: this is too heavy to update just one value, ideally we'd like
1485 * to use sysfs_update_group but some refactoring is needed first.
1486 */
1487 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1488 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
1489 }
1490
1491 int __init btrfs_init_sysfs(void)
1492 {
1493 int ret;
1494
1495 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
1496 if (!btrfs_kset)
1497 return -ENOMEM;
1498
1499 init_feature_attrs();
1500 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1501 if (ret)
1502 goto out2;
1503 ret = sysfs_merge_group(&btrfs_kset->kobj,
1504 &btrfs_static_feature_attr_group);
1505 if (ret)
1506 goto out_remove_group;
1507
1508 #ifdef CONFIG_BTRFS_DEBUG
1509 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1510 if (ret)
1511 goto out2;
1512 #endif
1513
1514 return 0;
1515
1516 out_remove_group:
1517 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1518 out2:
1519 kset_unregister(btrfs_kset);
1520
1521 return ret;
1522 }
1523
1524 void __cold btrfs_exit_sysfs(void)
1525 {
1526 sysfs_unmerge_group(&btrfs_kset->kobj,
1527 &btrfs_static_feature_attr_group);
1528 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
1529 #ifdef CONFIG_BTRFS_DEBUG
1530 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
1531 #endif
1532 kset_unregister(btrfs_kset);
1533 }
1534
Linux with added FPC-III support