Line data Source code
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 <linux/list.h>
13 : #include <crypto/hash.h>
14 : #include "messages.h"
15 : #include "ctree.h"
16 : #include "discard.h"
17 : #include "disk-io.h"
18 : #include "send.h"
19 : #include "transaction.h"
20 : #include "sysfs.h"
21 : #include "volumes.h"
22 : #include "space-info.h"
23 : #include "block-group.h"
24 : #include "qgroup.h"
25 : #include "misc.h"
26 : #include "fs.h"
27 : #include "accessors.h"
28 :
29 : /*
30 : * Structure name Path
31 : * --------------------------------------------------------------------------
32 : * btrfs_supported_static_feature_attrs /sys/fs/btrfs/features
33 : * btrfs_supported_feature_attrs /sys/fs/btrfs/features and
34 : * /sys/fs/btrfs/<uuid>/features
35 : * btrfs_attrs /sys/fs/btrfs/<uuid>
36 : * devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid>
37 : * allocation_attrs /sys/fs/btrfs/<uuid>/allocation
38 : * qgroup_attrs /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>
39 : * space_info_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>
40 : * raid_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>
41 : * discard_attrs /sys/fs/btrfs/<uuid>/discard
42 : *
43 : * When built with BTRFS_CONFIG_DEBUG:
44 : *
45 : * btrfs_debug_feature_attrs /sys/fs/btrfs/debug
46 : * btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug
47 : */
48 :
49 : struct btrfs_feature_attr {
50 : struct kobj_attribute kobj_attr;
51 : enum btrfs_feature_set feature_set;
52 : u64 feature_bit;
53 : };
54 :
55 : /* For raid type sysfs entries */
56 : struct raid_kobject {
57 : u64 flags;
58 : struct kobject kobj;
59 : };
60 :
61 : #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
62 : { \
63 : .attr = { .name = __stringify(_name), .mode = _mode }, \
64 : .show = _show, \
65 : .store = _store, \
66 : }
67 :
68 : #define BTRFS_ATTR_W(_prefix, _name, _store) \
69 : static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
70 : __INIT_KOBJ_ATTR(_name, 0200, NULL, _store)
71 :
72 : #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \
73 : static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
74 : __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
75 :
76 : #define BTRFS_ATTR(_prefix, _name, _show) \
77 : static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
78 : __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
79 :
80 : #define BTRFS_ATTR_PTR(_prefix, _name) \
81 : (&btrfs_attr_##_prefix##_##_name.attr)
82 :
83 : #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \
84 : static struct btrfs_feature_attr btrfs_attr_features_##_name = { \
85 : .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
86 : btrfs_feature_attr_show, \
87 : btrfs_feature_attr_store), \
88 : .feature_set = _feature_set, \
89 : .feature_bit = _feature_prefix ##_## _feature_bit, \
90 : }
91 : #define BTRFS_FEAT_ATTR_PTR(_name) \
92 : (&btrfs_attr_features_##_name.kobj_attr.attr)
93 :
94 : #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
95 : BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
96 : #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
97 : BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
98 : #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
99 : BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
100 :
101 : static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
102 : static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
103 : static struct kobject *get_btrfs_kobj(struct kobject *kobj);
104 :
105 : static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a)
106 : {
107 : return container_of(a, struct btrfs_feature_attr, kobj_attr);
108 : }
109 :
110 : static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
111 : {
112 : return container_of(attr, struct kobj_attribute, attr);
113 : }
114 :
115 : static struct btrfs_feature_attr *attr_to_btrfs_feature_attr(
116 : struct attribute *attr)
117 : {
118 : return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
119 : }
120 :
121 : static u64 get_features(struct btrfs_fs_info *fs_info,
122 : enum btrfs_feature_set set)
123 : {
124 61501 : struct btrfs_super_block *disk_super = fs_info->super_copy;
125 61501 : if (set == FEAT_COMPAT)
126 6430 : return btrfs_super_compat_flags(disk_super);
127 55071 : else if (set == FEAT_COMPAT_RO)
128 12924 : return btrfs_super_compat_ro_flags(disk_super);
129 : else
130 42147 : return btrfs_super_incompat_flags(disk_super);
131 : }
132 :
133 : static void set_features(struct btrfs_fs_info *fs_info,
134 : enum btrfs_feature_set set, u64 features)
135 : {
136 0 : struct btrfs_super_block *disk_super = fs_info->super_copy;
137 0 : if (set == FEAT_COMPAT)
138 0 : btrfs_set_super_compat_flags(disk_super, features);
139 0 : else if (set == FEAT_COMPAT_RO)
140 0 : btrfs_set_super_compat_ro_flags(disk_super, features);
141 : else
142 0 : btrfs_set_super_incompat_flags(disk_super, features);
143 : }
144 :
145 42211 : static int can_modify_feature(struct btrfs_feature_attr *fa)
146 : {
147 42211 : int val = 0;
148 42211 : u64 set, clear;
149 42211 : switch (fa->feature_set) {
150 : case FEAT_COMPAT:
151 : set = BTRFS_FEATURE_COMPAT_SAFE_SET;
152 : clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
153 : break;
154 : case FEAT_COMPAT_RO:
155 : set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
156 : clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
157 : break;
158 35717 : case FEAT_INCOMPAT:
159 35717 : set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
160 35717 : clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
161 35717 : break;
162 0 : default:
163 0 : pr_warn("btrfs: sysfs: unknown feature set %d\n",
164 : fa->feature_set);
165 0 : return 0;
166 : }
167 :
168 42211 : if (set & fa->feature_bit)
169 3247 : val |= 1;
170 : if (clear & fa->feature_bit)
171 : val |= 2;
172 :
173 : return val;
174 : }
175 :
176 0 : static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
177 : struct kobj_attribute *a, char *buf)
178 : {
179 0 : int val = 0;
180 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
181 0 : struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
182 0 : if (fs_info) {
183 0 : u64 features = get_features(fs_info, fa->feature_set);
184 0 : if (features & fa->feature_bit)
185 0 : val = 1;
186 : } else
187 0 : val = can_modify_feature(fa);
188 :
189 0 : return sysfs_emit(buf, "%d\n", val);
190 : }
191 :
192 0 : static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
193 : struct kobj_attribute *a,
194 : const char *buf, size_t count)
195 : {
196 0 : struct btrfs_fs_info *fs_info;
197 0 : struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
198 0 : u64 features, set, clear;
199 0 : unsigned long val;
200 0 : int ret;
201 :
202 0 : fs_info = to_fs_info(kobj);
203 0 : if (!fs_info)
204 : return -EPERM;
205 :
206 0 : if (sb_rdonly(fs_info->sb))
207 : return -EROFS;
208 :
209 0 : ret = kstrtoul(skip_spaces(buf), 0, &val);
210 0 : if (ret)
211 0 : return ret;
212 :
213 0 : if (fa->feature_set == FEAT_COMPAT) {
214 : set = BTRFS_FEATURE_COMPAT_SAFE_SET;
215 : clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
216 0 : } else if (fa->feature_set == FEAT_COMPAT_RO) {
217 : set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
218 : clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
219 : } else {
220 0 : set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
221 0 : clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
222 : }
223 :
224 0 : features = get_features(fs_info, fa->feature_set);
225 :
226 : /* Nothing to do */
227 0 : if ((val && (features & fa->feature_bit)) ||
228 0 : (!val && !(features & fa->feature_bit)))
229 0 : return count;
230 :
231 0 : if ((val && !(set & fa->feature_bit)) ||
232 : (!val && !(clear & fa->feature_bit))) {
233 0 : btrfs_info(fs_info,
234 : "%sabling feature %s on mounted fs is not supported.",
235 : val ? "En" : "Dis", fa->kobj_attr.attr.name);
236 0 : return -EPERM;
237 : }
238 :
239 0 : btrfs_info(fs_info, "%s %s feature flag",
240 : val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
241 :
242 0 : spin_lock(&fs_info->super_lock);
243 0 : features = get_features(fs_info, fa->feature_set);
244 0 : if (val)
245 0 : features |= fa->feature_bit;
246 : else
247 0 : features &= ~fa->feature_bit;
248 0 : set_features(fs_info, fa->feature_set, features);
249 0 : spin_unlock(&fs_info->super_lock);
250 :
251 : /*
252 : * We don't want to do full transaction commit from inside sysfs
253 : */
254 0 : set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags);
255 0 : wake_up_process(fs_info->transaction_kthread);
256 :
257 0 : return count;
258 : }
259 :
260 42354 : static umode_t btrfs_feature_visible(struct kobject *kobj,
261 : struct attribute *attr, int unused)
262 : {
263 42354 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
264 42354 : umode_t mode = attr->mode;
265 :
266 143 : if (fs_info) {
267 42211 : struct btrfs_feature_attr *fa;
268 42211 : u64 features;
269 :
270 42211 : fa = attr_to_btrfs_feature_attr(attr);
271 42211 : features = get_features(fs_info, fa->feature_set);
272 :
273 42211 : if (can_modify_feature(fa))
274 3247 : mode |= S_IWUSR;
275 38964 : else if (!(features & fa->feature_bit))
276 29020 : mode = 0;
277 : }
278 :
279 42354 : return mode;
280 : }
281 :
282 : BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
283 : BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
284 : BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
285 : BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
286 : BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
287 : BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
288 : BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
289 : BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
290 : BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
291 : BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
292 : BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE);
293 : BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);
294 : #ifdef CONFIG_BLK_DEV_ZONED
295 : BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED);
296 : #endif
297 : #ifdef CONFIG_BTRFS_DEBUG
298 : /* Remove once support for extent tree v2 is feature complete */
299 : BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2);
300 : #endif
301 : #ifdef CONFIG_FS_VERITY
302 : BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY);
303 : #endif
304 :
305 : /*
306 : * Features which depend on feature bits and may differ between each fs.
307 : *
308 : * /sys/fs/btrfs/features - all available features implemented by this version
309 : * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or
310 : * can be changed on a mounted filesystem.
311 : */
312 : static struct attribute *btrfs_supported_feature_attrs[] = {
313 : BTRFS_FEAT_ATTR_PTR(default_subvol),
314 : BTRFS_FEAT_ATTR_PTR(mixed_groups),
315 : BTRFS_FEAT_ATTR_PTR(compress_lzo),
316 : BTRFS_FEAT_ATTR_PTR(compress_zstd),
317 : BTRFS_FEAT_ATTR_PTR(extended_iref),
318 : BTRFS_FEAT_ATTR_PTR(raid56),
319 : BTRFS_FEAT_ATTR_PTR(skinny_metadata),
320 : BTRFS_FEAT_ATTR_PTR(no_holes),
321 : BTRFS_FEAT_ATTR_PTR(metadata_uuid),
322 : BTRFS_FEAT_ATTR_PTR(free_space_tree),
323 : BTRFS_FEAT_ATTR_PTR(raid1c34),
324 : BTRFS_FEAT_ATTR_PTR(block_group_tree),
325 : #ifdef CONFIG_BLK_DEV_ZONED
326 : BTRFS_FEAT_ATTR_PTR(zoned),
327 : #endif
328 : #ifdef CONFIG_BTRFS_DEBUG
329 : BTRFS_FEAT_ATTR_PTR(extent_tree_v2),
330 : #endif
331 : #ifdef CONFIG_FS_VERITY
332 : BTRFS_FEAT_ATTR_PTR(verity),
333 : #endif
334 : NULL
335 : };
336 :
337 : static const struct attribute_group btrfs_feature_attr_group = {
338 : .name = "features",
339 : .is_visible = btrfs_feature_visible,
340 : .attrs = btrfs_supported_feature_attrs,
341 : };
342 :
343 0 : static ssize_t rmdir_subvol_show(struct kobject *kobj,
344 : struct kobj_attribute *ka, char *buf)
345 : {
346 0 : return sysfs_emit(buf, "0\n");
347 : }
348 : BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
349 :
350 0 : static ssize_t supported_checksums_show(struct kobject *kobj,
351 : struct kobj_attribute *a, char *buf)
352 : {
353 0 : ssize_t ret = 0;
354 0 : int i;
355 :
356 0 : for (i = 0; i < btrfs_get_num_csums(); i++) {
357 : /*
358 : * This "trick" only works as long as 'enum btrfs_csum_type' has
359 : * no holes in it
360 : */
361 0 : ret += sysfs_emit_at(buf, ret, "%s%s", (i == 0 ? "" : " "),
362 : btrfs_super_csum_name(i));
363 :
364 : }
365 :
366 0 : ret += sysfs_emit_at(buf, ret, "\n");
367 0 : return ret;
368 : }
369 : BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);
370 :
371 0 : static ssize_t send_stream_version_show(struct kobject *kobj,
372 : struct kobj_attribute *ka, char *buf)
373 : {
374 0 : return sysfs_emit(buf, "%d\n", BTRFS_SEND_STREAM_VERSION);
375 : }
376 : BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);
377 :
378 : static const char *rescue_opts[] = {
379 : "usebackuproot",
380 : "nologreplay",
381 : "ignorebadroots",
382 : "ignoredatacsums",
383 : "all",
384 : };
385 :
386 0 : static ssize_t supported_rescue_options_show(struct kobject *kobj,
387 : struct kobj_attribute *a,
388 : char *buf)
389 : {
390 0 : ssize_t ret = 0;
391 0 : int i;
392 :
393 0 : for (i = 0; i < ARRAY_SIZE(rescue_opts); i++)
394 0 : ret += sysfs_emit_at(buf, ret, "%s%s", (i ? " " : ""), rescue_opts[i]);
395 0 : ret += sysfs_emit_at(buf, ret, "\n");
396 0 : return ret;
397 : }
398 : BTRFS_ATTR(static_feature, supported_rescue_options,
399 : supported_rescue_options_show);
400 :
401 15 : static ssize_t supported_sectorsizes_show(struct kobject *kobj,
402 : struct kobj_attribute *a,
403 : char *buf)
404 : {
405 15 : ssize_t ret = 0;
406 :
407 : /* An artificial limit to only support 4K and PAGE_SIZE */
408 15 : if (PAGE_SIZE > SZ_4K)
409 : ret += sysfs_emit_at(buf, ret, "%u ", SZ_4K);
410 15 : ret += sysfs_emit_at(buf, ret, "%lu\n", PAGE_SIZE);
411 :
412 15 : return ret;
413 : }
414 : BTRFS_ATTR(static_feature, supported_sectorsizes,
415 : supported_sectorsizes_show);
416 :
417 : /*
418 : * Features which only depend on kernel version.
419 : *
420 : * These are listed in /sys/fs/btrfs/features along with
421 : * btrfs_supported_feature_attrs.
422 : */
423 : static struct attribute *btrfs_supported_static_feature_attrs[] = {
424 : BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
425 : BTRFS_ATTR_PTR(static_feature, supported_checksums),
426 : BTRFS_ATTR_PTR(static_feature, send_stream_version),
427 : BTRFS_ATTR_PTR(static_feature, supported_rescue_options),
428 : BTRFS_ATTR_PTR(static_feature, supported_sectorsizes),
429 : NULL
430 : };
431 :
432 : static const struct attribute_group btrfs_static_feature_attr_group = {
433 : .name = "features",
434 : .attrs = btrfs_supported_static_feature_attrs,
435 : };
436 :
437 : /*
438 : * Discard statistics and tunables
439 : */
440 : #define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj))
441 :
442 0 : static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
443 : struct kobj_attribute *a,
444 : char *buf)
445 : {
446 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
447 :
448 0 : return sysfs_emit(buf, "%lld\n",
449 : atomic64_read(&fs_info->discard_ctl.discardable_bytes));
450 : }
451 : BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
452 :
453 0 : static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
454 : struct kobj_attribute *a,
455 : char *buf)
456 : {
457 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
458 :
459 0 : return sysfs_emit(buf, "%d\n",
460 : atomic_read(&fs_info->discard_ctl.discardable_extents));
461 : }
462 : BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
463 :
464 0 : static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
465 : struct kobj_attribute *a,
466 : char *buf)
467 : {
468 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
469 :
470 0 : return sysfs_emit(buf, "%llu\n",
471 : fs_info->discard_ctl.discard_bitmap_bytes);
472 : }
473 : BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
474 :
475 0 : static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
476 : struct kobj_attribute *a,
477 : char *buf)
478 : {
479 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
480 :
481 0 : return sysfs_emit(buf, "%lld\n",
482 : atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
483 : }
484 : BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
485 :
486 0 : static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
487 : struct kobj_attribute *a,
488 : char *buf)
489 : {
490 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
491 :
492 0 : return sysfs_emit(buf, "%llu\n",
493 : fs_info->discard_ctl.discard_extent_bytes);
494 : }
495 : BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
496 :
497 0 : static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
498 : struct kobj_attribute *a,
499 : char *buf)
500 : {
501 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
502 :
503 0 : return sysfs_emit(buf, "%u\n",
504 0 : READ_ONCE(fs_info->discard_ctl.iops_limit));
505 : }
506 :
507 0 : static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
508 : struct kobj_attribute *a,
509 : const char *buf, size_t len)
510 : {
511 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
512 0 : struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
513 0 : u32 iops_limit;
514 0 : int ret;
515 :
516 0 : ret = kstrtou32(buf, 10, &iops_limit);
517 0 : if (ret)
518 : return -EINVAL;
519 :
520 0 : WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
521 0 : btrfs_discard_calc_delay(discard_ctl);
522 0 : btrfs_discard_schedule_work(discard_ctl, true);
523 0 : return len;
524 : }
525 : BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
526 : btrfs_discard_iops_limit_store);
527 :
528 0 : static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
529 : struct kobj_attribute *a,
530 : char *buf)
531 : {
532 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
533 :
534 0 : return sysfs_emit(buf, "%u\n",
535 0 : READ_ONCE(fs_info->discard_ctl.kbps_limit));
536 : }
537 :
538 0 : static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
539 : struct kobj_attribute *a,
540 : const char *buf, size_t len)
541 : {
542 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
543 0 : struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
544 0 : u32 kbps_limit;
545 0 : int ret;
546 :
547 0 : ret = kstrtou32(buf, 10, &kbps_limit);
548 0 : if (ret)
549 : return -EINVAL;
550 :
551 0 : WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
552 0 : btrfs_discard_schedule_work(discard_ctl, true);
553 0 : return len;
554 : }
555 : BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
556 : btrfs_discard_kbps_limit_store);
557 :
558 0 : static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
559 : struct kobj_attribute *a,
560 : char *buf)
561 : {
562 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
563 :
564 0 : return sysfs_emit(buf, "%llu\n",
565 0 : READ_ONCE(fs_info->discard_ctl.max_discard_size));
566 : }
567 :
568 0 : static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
569 : struct kobj_attribute *a,
570 : const char *buf, size_t len)
571 : {
572 0 : struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
573 0 : struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
574 0 : u64 max_discard_size;
575 0 : int ret;
576 :
577 0 : ret = kstrtou64(buf, 10, &max_discard_size);
578 0 : if (ret)
579 : return -EINVAL;
580 :
581 0 : WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
582 :
583 0 : return len;
584 : }
585 : BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
586 : btrfs_discard_max_discard_size_store);
587 :
588 : /*
589 : * Per-filesystem stats for discard (when mounted with discard=async).
590 : *
591 : * Path: /sys/fs/btrfs/<uuid>/discard/
592 : */
593 : static const struct attribute *discard_attrs[] = {
594 : BTRFS_ATTR_PTR(discard, discardable_bytes),
595 : BTRFS_ATTR_PTR(discard, discardable_extents),
596 : BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
597 : BTRFS_ATTR_PTR(discard, discard_bytes_saved),
598 : BTRFS_ATTR_PTR(discard, discard_extent_bytes),
599 : BTRFS_ATTR_PTR(discard, iops_limit),
600 : BTRFS_ATTR_PTR(discard, kbps_limit),
601 : BTRFS_ATTR_PTR(discard, max_discard_size),
602 : NULL,
603 : };
604 :
605 : #ifdef CONFIG_BTRFS_DEBUG
606 :
607 : /*
608 : * Per-filesystem runtime debugging exported via sysfs.
609 : *
610 : * Path: /sys/fs/btrfs/UUID/debug/
611 : */
612 : static const struct attribute *btrfs_debug_mount_attrs[] = {
613 : NULL,
614 : };
615 :
616 : /*
617 : * Runtime debugging exported via sysfs, applies to all mounted filesystems.
618 : *
619 : * Path: /sys/fs/btrfs/debug
620 : */
621 : static struct attribute *btrfs_debug_feature_attrs[] = {
622 : NULL
623 : };
624 :
625 : static const struct attribute_group btrfs_debug_feature_attr_group = {
626 : .name = "debug",
627 : .attrs = btrfs_debug_feature_attrs,
628 : };
629 :
630 : #endif
631 :
632 2 : static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
633 : {
634 2 : u64 val;
635 2 : if (lock)
636 2 : spin_lock(lock);
637 2 : val = *value_ptr;
638 2 : if (lock)
639 2 : spin_unlock(lock);
640 2 : return sysfs_emit(buf, "%llu\n", val);
641 : }
642 :
643 0 : static ssize_t global_rsv_size_show(struct kobject *kobj,
644 : struct kobj_attribute *ka, char *buf)
645 : {
646 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
647 0 : struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
648 0 : return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
649 : }
650 : BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
651 :
652 1 : static ssize_t global_rsv_reserved_show(struct kobject *kobj,
653 : struct kobj_attribute *a, char *buf)
654 : {
655 1 : struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
656 1 : struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
657 1 : return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
658 : }
659 : BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
660 :
661 : #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
662 : #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
663 :
664 : static ssize_t raid_bytes_show(struct kobject *kobj,
665 : struct kobj_attribute *attr, char *buf);
666 : BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
667 : BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
668 :
669 0 : static ssize_t raid_bytes_show(struct kobject *kobj,
670 : struct kobj_attribute *attr, char *buf)
671 :
672 : {
673 0 : struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
674 0 : struct btrfs_block_group *block_group;
675 0 : int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
676 0 : u64 val = 0;
677 :
678 0 : down_read(&sinfo->groups_sem);
679 0 : list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
680 0 : if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
681 0 : val += block_group->length;
682 : else
683 0 : val += block_group->used;
684 : }
685 0 : up_read(&sinfo->groups_sem);
686 0 : return sysfs_emit(buf, "%llu\n", val);
687 : }
688 :
689 : /*
690 : * Allocation information about block group profiles.
691 : *
692 : * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/
693 : */
694 : static struct attribute *raid_attrs[] = {
695 : BTRFS_ATTR_PTR(raid, total_bytes),
696 : BTRFS_ATTR_PTR(raid, used_bytes),
697 : NULL
698 : };
699 : ATTRIBUTE_GROUPS(raid);
700 :
701 9615 : static void release_raid_kobj(struct kobject *kobj)
702 : {
703 9615 : kfree(to_raid_kobj(kobj));
704 9615 : }
705 :
706 : static const struct kobj_type btrfs_raid_ktype = {
707 : .sysfs_ops = &kobj_sysfs_ops,
708 : .release = release_raid_kobj,
709 : .default_groups = raid_groups,
710 : };
711 :
712 : #define SPACE_INFO_ATTR(field) \
713 : static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
714 : struct kobj_attribute *a, \
715 : char *buf) \
716 : { \
717 : struct btrfs_space_info *sinfo = to_space_info(kobj); \
718 : return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
719 : } \
720 : BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
721 :
722 0 : static ssize_t btrfs_chunk_size_show(struct kobject *kobj,
723 : struct kobj_attribute *a, char *buf)
724 : {
725 0 : struct btrfs_space_info *sinfo = to_space_info(kobj);
726 :
727 0 : return sysfs_emit(buf, "%llu\n", READ_ONCE(sinfo->chunk_size));
728 : }
729 :
730 : /*
731 : * Store new chunk size in space info. Can be called on a read-only filesystem.
732 : *
733 : * If the new chunk size value is larger than 10% of free space it is reduced
734 : * to match that limit. Alignment must be to 256M and the system chunk size
735 : * cannot be set.
736 : */
737 0 : static ssize_t btrfs_chunk_size_store(struct kobject *kobj,
738 : struct kobj_attribute *a,
739 : const char *buf, size_t len)
740 : {
741 0 : struct btrfs_space_info *space_info = to_space_info(kobj);
742 0 : struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj));
743 0 : char *retptr;
744 0 : u64 val;
745 :
746 0 : if (!capable(CAP_SYS_ADMIN))
747 : return -EPERM;
748 :
749 0 : if (!fs_info->fs_devices)
750 : return -EINVAL;
751 :
752 0 : if (btrfs_is_zoned(fs_info))
753 : return -EINVAL;
754 :
755 : /* System block type must not be changed. */
756 0 : if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM)
757 : return -EPERM;
758 :
759 0 : val = memparse(buf, &retptr);
760 : /* There could be trailing '\n', also catch any typos after the value */
761 0 : retptr = skip_spaces(retptr);
762 0 : if (*retptr != 0 || val == 0)
763 : return -EINVAL;
764 :
765 0 : val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE);
766 :
767 : /* Limit stripe size to 10% of available space. */
768 0 : val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val);
769 :
770 : /* Must be multiple of 256M. */
771 0 : val &= ~((u64)SZ_256M - 1);
772 :
773 : /* Must be at least 256M. */
774 0 : if (val < SZ_256M)
775 : return -EINVAL;
776 :
777 0 : btrfs_update_space_info_chunk_size(space_info, val);
778 :
779 0 : return len;
780 : }
781 :
782 2 : static ssize_t btrfs_size_classes_show(struct kobject *kobj,
783 : struct kobj_attribute *a, char *buf)
784 : {
785 2 : struct btrfs_space_info *sinfo = to_space_info(kobj);
786 2 : struct btrfs_block_group *bg;
787 2 : u32 none = 0;
788 2 : u32 small = 0;
789 2 : u32 medium = 0;
790 2 : u32 large = 0;
791 :
792 20 : for (int i = 0; i < BTRFS_NR_RAID_TYPES; ++i) {
793 18 : down_read(&sinfo->groups_sem);
794 24 : list_for_each_entry(bg, &sinfo->block_groups[i], list) {
795 6 : if (!btrfs_block_group_should_use_size_class(bg))
796 0 : continue;
797 6 : switch (bg->size_class) {
798 0 : case BTRFS_BG_SZ_NONE:
799 0 : none++;
800 0 : break;
801 2 : case BTRFS_BG_SZ_SMALL:
802 2 : small++;
803 2 : break;
804 2 : case BTRFS_BG_SZ_MEDIUM:
805 2 : medium++;
806 2 : break;
807 2 : case BTRFS_BG_SZ_LARGE:
808 2 : large++;
809 2 : break;
810 : }
811 : }
812 18 : up_read(&sinfo->groups_sem);
813 : }
814 2 : return sysfs_emit(buf, "none %u\n"
815 : "small %u\n"
816 : "medium %u\n"
817 : "large %u\n",
818 : none, small, medium, large);
819 : }
820 :
821 : #ifdef CONFIG_BTRFS_DEBUG
822 : /*
823 : * Request chunk allocation with current chunk size.
824 : */
825 : static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj,
826 : struct kobj_attribute *a,
827 : const char *buf, size_t len)
828 : {
829 : struct btrfs_space_info *space_info = to_space_info(kobj);
830 : struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj));
831 : struct btrfs_trans_handle *trans;
832 : bool val;
833 : int ret;
834 :
835 : if (!capable(CAP_SYS_ADMIN))
836 : return -EPERM;
837 :
838 : if (sb_rdonly(fs_info->sb))
839 : return -EROFS;
840 :
841 : ret = kstrtobool(buf, &val);
842 : if (ret)
843 : return ret;
844 :
845 : if (!val)
846 : return -EINVAL;
847 :
848 : /*
849 : * This is unsafe to be called from sysfs context and may cause
850 : * unexpected problems.
851 : */
852 : trans = btrfs_start_transaction(fs_info->tree_root, 0);
853 : if (IS_ERR(trans))
854 : return PTR_ERR(trans);
855 : ret = btrfs_force_chunk_alloc(trans, space_info->flags);
856 : btrfs_end_transaction(trans);
857 :
858 : if (ret == 1)
859 : return len;
860 :
861 : return -ENOSPC;
862 : }
863 : BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store);
864 :
865 : #endif
866 :
867 0 : SPACE_INFO_ATTR(flags);
868 0 : SPACE_INFO_ATTR(total_bytes);
869 0 : SPACE_INFO_ATTR(bytes_used);
870 0 : SPACE_INFO_ATTR(bytes_pinned);
871 0 : SPACE_INFO_ATTR(bytes_reserved);
872 1 : SPACE_INFO_ATTR(bytes_may_use);
873 0 : SPACE_INFO_ATTR(bytes_readonly);
874 0 : SPACE_INFO_ATTR(bytes_zone_unusable);
875 0 : SPACE_INFO_ATTR(disk_used);
876 0 : SPACE_INFO_ATTR(disk_total);
877 : BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store);
878 : BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show);
879 :
880 0 : static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj,
881 : struct kobj_attribute *a,
882 : char *buf)
883 : {
884 0 : struct btrfs_space_info *space_info = to_space_info(kobj);
885 :
886 0 : return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->bg_reclaim_threshold));
887 : }
888 :
889 0 : static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj,
890 : struct kobj_attribute *a,
891 : const char *buf, size_t len)
892 : {
893 0 : struct btrfs_space_info *space_info = to_space_info(kobj);
894 0 : int thresh;
895 0 : int ret;
896 :
897 0 : ret = kstrtoint(buf, 10, &thresh);
898 0 : if (ret)
899 0 : return ret;
900 :
901 0 : if (thresh < 0 || thresh > 100)
902 : return -EINVAL;
903 :
904 0 : WRITE_ONCE(space_info->bg_reclaim_threshold, thresh);
905 :
906 0 : return len;
907 : }
908 :
909 : BTRFS_ATTR_RW(space_info, bg_reclaim_threshold,
910 : btrfs_sinfo_bg_reclaim_threshold_show,
911 : btrfs_sinfo_bg_reclaim_threshold_store);
912 :
913 : /*
914 : * Allocation information about block group types.
915 : *
916 : * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/
917 : */
918 : static struct attribute *space_info_attrs[] = {
919 : BTRFS_ATTR_PTR(space_info, flags),
920 : BTRFS_ATTR_PTR(space_info, total_bytes),
921 : BTRFS_ATTR_PTR(space_info, bytes_used),
922 : BTRFS_ATTR_PTR(space_info, bytes_pinned),
923 : BTRFS_ATTR_PTR(space_info, bytes_reserved),
924 : BTRFS_ATTR_PTR(space_info, bytes_may_use),
925 : BTRFS_ATTR_PTR(space_info, bytes_readonly),
926 : BTRFS_ATTR_PTR(space_info, bytes_zone_unusable),
927 : BTRFS_ATTR_PTR(space_info, disk_used),
928 : BTRFS_ATTR_PTR(space_info, disk_total),
929 : BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold),
930 : BTRFS_ATTR_PTR(space_info, chunk_size),
931 : BTRFS_ATTR_PTR(space_info, size_classes),
932 : #ifdef CONFIG_BTRFS_DEBUG
933 : BTRFS_ATTR_PTR(space_info, force_chunk_alloc),
934 : #endif
935 : NULL,
936 : };
937 : ATTRIBUTE_GROUPS(space_info);
938 :
939 9615 : static void space_info_release(struct kobject *kobj)
940 : {
941 9615 : struct btrfs_space_info *sinfo = to_space_info(kobj);
942 9615 : kfree(sinfo);
943 9615 : }
944 :
945 : static const struct kobj_type space_info_ktype = {
946 : .sysfs_ops = &kobj_sysfs_ops,
947 : .release = space_info_release,
948 : .default_groups = space_info_groups,
949 : };
950 :
951 : /*
952 : * Allocation information about block groups.
953 : *
954 : * Path: /sys/fs/btrfs/<uuid>/allocation/
955 : */
956 : static const struct attribute *allocation_attrs[] = {
957 : BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
958 : BTRFS_ATTR_PTR(allocation, global_rsv_size),
959 : NULL,
960 : };
961 :
962 0 : static ssize_t btrfs_label_show(struct kobject *kobj,
963 : struct kobj_attribute *a, char *buf)
964 : {
965 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
966 0 : char *label = fs_info->super_copy->label;
967 0 : ssize_t ret;
968 :
969 0 : spin_lock(&fs_info->super_lock);
970 0 : ret = sysfs_emit(buf, label[0] ? "%s\n" : "%s", label);
971 0 : spin_unlock(&fs_info->super_lock);
972 :
973 0 : return ret;
974 : }
975 :
976 0 : static ssize_t btrfs_label_store(struct kobject *kobj,
977 : struct kobj_attribute *a,
978 : const char *buf, size_t len)
979 : {
980 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
981 0 : size_t p_len;
982 :
983 0 : if (!fs_info)
984 : return -EPERM;
985 :
986 0 : if (sb_rdonly(fs_info->sb))
987 : return -EROFS;
988 :
989 : /*
990 : * p_len is the len until the first occurrence of either
991 : * '\n' or '\0'
992 : */
993 0 : p_len = strcspn(buf, "\n");
994 :
995 0 : if (p_len >= BTRFS_LABEL_SIZE)
996 : return -EINVAL;
997 :
998 0 : spin_lock(&fs_info->super_lock);
999 0 : memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
1000 0 : memcpy(fs_info->super_copy->label, buf, p_len);
1001 0 : spin_unlock(&fs_info->super_lock);
1002 :
1003 : /*
1004 : * We don't want to do full transaction commit from inside sysfs
1005 : */
1006 0 : set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags);
1007 0 : wake_up_process(fs_info->transaction_kthread);
1008 :
1009 0 : return len;
1010 : }
1011 : BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
1012 :
1013 0 : static ssize_t btrfs_nodesize_show(struct kobject *kobj,
1014 : struct kobj_attribute *a, char *buf)
1015 : {
1016 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1017 :
1018 0 : return sysfs_emit(buf, "%u\n", fs_info->super_copy->nodesize);
1019 : }
1020 :
1021 : BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
1022 :
1023 0 : static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
1024 : struct kobj_attribute *a, char *buf)
1025 : {
1026 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1027 :
1028 0 : return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize);
1029 : }
1030 :
1031 : BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
1032 :
1033 0 : static ssize_t btrfs_commit_stats_show(struct kobject *kobj,
1034 : struct kobj_attribute *a, char *buf)
1035 : {
1036 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1037 :
1038 0 : return sysfs_emit(buf,
1039 : "commits %llu\n"
1040 : "last_commit_ms %llu\n"
1041 : "max_commit_ms %llu\n"
1042 : "total_commit_ms %llu\n",
1043 : fs_info->commit_stats.commit_count,
1044 : div_u64(fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC),
1045 : div_u64(fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC),
1046 : div_u64(fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC));
1047 : }
1048 :
1049 0 : static ssize_t btrfs_commit_stats_store(struct kobject *kobj,
1050 : struct kobj_attribute *a,
1051 : const char *buf, size_t len)
1052 : {
1053 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1054 0 : unsigned long val;
1055 0 : int ret;
1056 :
1057 0 : if (!fs_info)
1058 : return -EPERM;
1059 :
1060 0 : if (!capable(CAP_SYS_RESOURCE))
1061 : return -EPERM;
1062 :
1063 0 : ret = kstrtoul(buf, 10, &val);
1064 0 : if (ret)
1065 0 : return ret;
1066 0 : if (val)
1067 : return -EINVAL;
1068 :
1069 0 : WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0);
1070 :
1071 0 : return len;
1072 : }
1073 : BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store);
1074 :
1075 0 : static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
1076 : struct kobj_attribute *a, char *buf)
1077 : {
1078 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1079 :
1080 0 : return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize);
1081 : }
1082 :
1083 : BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
1084 :
1085 0 : static ssize_t quota_override_show(struct kobject *kobj,
1086 : struct kobj_attribute *a, char *buf)
1087 : {
1088 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1089 0 : int quota_override;
1090 :
1091 0 : quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
1092 0 : return sysfs_emit(buf, "%d\n", quota_override);
1093 : }
1094 :
1095 0 : static ssize_t quota_override_store(struct kobject *kobj,
1096 : struct kobj_attribute *a,
1097 : const char *buf, size_t len)
1098 : {
1099 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1100 0 : unsigned long knob;
1101 0 : int err;
1102 :
1103 0 : if (!fs_info)
1104 : return -EPERM;
1105 :
1106 0 : if (!capable(CAP_SYS_RESOURCE))
1107 : return -EPERM;
1108 :
1109 0 : err = kstrtoul(buf, 10, &knob);
1110 0 : if (err)
1111 0 : return err;
1112 0 : if (knob > 1)
1113 : return -EINVAL;
1114 :
1115 0 : if (knob)
1116 0 : set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
1117 : else
1118 0 : clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
1119 :
1120 0 : return len;
1121 : }
1122 :
1123 : BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
1124 :
1125 0 : static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
1126 : struct kobj_attribute *a, char *buf)
1127 : {
1128 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1129 :
1130 0 : return sysfs_emit(buf, "%pU\n", fs_info->fs_devices->metadata_uuid);
1131 : }
1132 :
1133 : BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
1134 :
1135 0 : static ssize_t btrfs_checksum_show(struct kobject *kobj,
1136 : struct kobj_attribute *a, char *buf)
1137 : {
1138 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1139 0 : u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
1140 :
1141 0 : return sysfs_emit(buf, "%s (%s)\n",
1142 : btrfs_super_csum_name(csum_type),
1143 : crypto_shash_driver_name(fs_info->csum_shash));
1144 : }
1145 :
1146 : BTRFS_ATTR(, checksum, btrfs_checksum_show);
1147 :
1148 201 : static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
1149 : struct kobj_attribute *a, char *buf)
1150 : {
1151 201 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1152 201 : const char *str;
1153 :
1154 201 : switch (READ_ONCE(fs_info->exclusive_operation)) {
1155 : case BTRFS_EXCLOP_NONE:
1156 : str = "none\n";
1157 : break;
1158 : case BTRFS_EXCLOP_BALANCE:
1159 : str = "balance\n";
1160 : break;
1161 : case BTRFS_EXCLOP_BALANCE_PAUSED:
1162 : str = "balance paused\n";
1163 : break;
1164 : case BTRFS_EXCLOP_DEV_ADD:
1165 : str = "device add\n";
1166 : break;
1167 : case BTRFS_EXCLOP_DEV_REMOVE:
1168 : str = "device remove\n";
1169 : break;
1170 : case BTRFS_EXCLOP_DEV_REPLACE:
1171 : str = "device replace\n";
1172 : break;
1173 : case BTRFS_EXCLOP_RESIZE:
1174 : str = "resize\n";
1175 : break;
1176 : case BTRFS_EXCLOP_SWAP_ACTIVATE:
1177 : str = "swap activate\n";
1178 : break;
1179 : default:
1180 : str = "UNKNOWN\n";
1181 : break;
1182 : }
1183 201 : return sysfs_emit(buf, "%s", str);
1184 : }
1185 : BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
1186 :
1187 0 : static ssize_t btrfs_generation_show(struct kobject *kobj,
1188 : struct kobj_attribute *a, char *buf)
1189 : {
1190 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1191 :
1192 0 : return sysfs_emit(buf, "%llu\n", fs_info->generation);
1193 : }
1194 : BTRFS_ATTR(, generation, btrfs_generation_show);
1195 :
1196 : static const char * const btrfs_read_policy_name[] = { "pid" };
1197 :
1198 0 : static ssize_t btrfs_read_policy_show(struct kobject *kobj,
1199 : struct kobj_attribute *a, char *buf)
1200 : {
1201 0 : struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
1202 0 : ssize_t ret = 0;
1203 0 : int i;
1204 :
1205 0 : for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
1206 0 : if (fs_devices->read_policy == i)
1207 0 : ret += sysfs_emit_at(buf, ret, "%s[%s]",
1208 : (ret == 0 ? "" : " "),
1209 : btrfs_read_policy_name[i]);
1210 : else
1211 0 : ret += sysfs_emit_at(buf, ret, "%s%s",
1212 : (ret == 0 ? "" : " "),
1213 : btrfs_read_policy_name[i]);
1214 : }
1215 :
1216 0 : ret += sysfs_emit_at(buf, ret, "\n");
1217 :
1218 0 : return ret;
1219 : }
1220 :
1221 0 : static ssize_t btrfs_read_policy_store(struct kobject *kobj,
1222 : struct kobj_attribute *a,
1223 : const char *buf, size_t len)
1224 : {
1225 0 : struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
1226 0 : int i;
1227 :
1228 0 : for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
1229 0 : if (sysfs_streq(buf, btrfs_read_policy_name[i])) {
1230 0 : if (i != fs_devices->read_policy) {
1231 0 : fs_devices->read_policy = i;
1232 0 : btrfs_info(fs_devices->fs_info,
1233 : "read policy set to '%s'",
1234 : btrfs_read_policy_name[i]);
1235 : }
1236 0 : return len;
1237 : }
1238 : }
1239 :
1240 : return -EINVAL;
1241 : }
1242 : BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store);
1243 :
1244 0 : static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj,
1245 : struct kobj_attribute *a,
1246 : char *buf)
1247 : {
1248 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1249 :
1250 0 : return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold));
1251 : }
1252 :
1253 0 : static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj,
1254 : struct kobj_attribute *a,
1255 : const char *buf, size_t len)
1256 : {
1257 0 : struct btrfs_fs_info *fs_info = to_fs_info(kobj);
1258 0 : int thresh;
1259 0 : int ret;
1260 :
1261 0 : ret = kstrtoint(buf, 10, &thresh);
1262 0 : if (ret)
1263 0 : return ret;
1264 :
1265 : #ifdef CONFIG_BTRFS_DEBUG
1266 : if (thresh != 0 && (thresh > 100))
1267 : return -EINVAL;
1268 : #else
1269 0 : if (thresh != 0 && (thresh <= 50 || thresh > 100))
1270 : return -EINVAL;
1271 : #endif
1272 :
1273 0 : WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh);
1274 :
1275 0 : return len;
1276 : }
1277 : BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show,
1278 : btrfs_bg_reclaim_threshold_store);
1279 :
1280 : /*
1281 : * Per-filesystem information and stats.
1282 : *
1283 : * Path: /sys/fs/btrfs/<uuid>/
1284 : */
1285 : static const struct attribute *btrfs_attrs[] = {
1286 : BTRFS_ATTR_PTR(, label),
1287 : BTRFS_ATTR_PTR(, nodesize),
1288 : BTRFS_ATTR_PTR(, sectorsize),
1289 : BTRFS_ATTR_PTR(, clone_alignment),
1290 : BTRFS_ATTR_PTR(, quota_override),
1291 : BTRFS_ATTR_PTR(, metadata_uuid),
1292 : BTRFS_ATTR_PTR(, checksum),
1293 : BTRFS_ATTR_PTR(, exclusive_operation),
1294 : BTRFS_ATTR_PTR(, generation),
1295 : BTRFS_ATTR_PTR(, read_policy),
1296 : BTRFS_ATTR_PTR(, bg_reclaim_threshold),
1297 : BTRFS_ATTR_PTR(, commit_stats),
1298 : NULL,
1299 : };
1300 :
1301 3215 : static void btrfs_release_fsid_kobj(struct kobject *kobj)
1302 : {
1303 3215 : struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
1304 :
1305 3215 : memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
1306 3215 : complete(&fs_devs->kobj_unregister);
1307 3215 : }
1308 :
1309 : static const struct kobj_type btrfs_ktype = {
1310 : .sysfs_ops = &kobj_sysfs_ops,
1311 : .release = btrfs_release_fsid_kobj,
1312 : };
1313 :
1314 : static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
1315 : {
1316 3215 : if (kobj->ktype != &btrfs_ktype)
1317 : return NULL;
1318 3215 : return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
1319 : }
1320 :
1321 : static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
1322 : {
1323 42556 : if (kobj->ktype != &btrfs_ktype)
1324 : return NULL;
1325 42413 : return to_fs_devs(kobj)->fs_info;
1326 : }
1327 :
1328 : static struct kobject *get_btrfs_kobj(struct kobject *kobj)
1329 : {
1330 0 : while (kobj) {
1331 0 : if (kobj->ktype == &btrfs_ktype)
1332 : return kobj;
1333 0 : kobj = kobj->parent;
1334 : }
1335 : return NULL;
1336 : }
1337 :
1338 : #define NUM_FEATURE_BITS 64
1339 : #define BTRFS_FEATURE_NAME_MAX 13
1340 : static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
1341 : static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
1342 :
1343 : static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) ==
1344 : ARRAY_SIZE(btrfs_feature_attrs));
1345 : static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) ==
1346 : ARRAY_SIZE(btrfs_feature_attrs[0]));
1347 :
1348 : static const u64 supported_feature_masks[FEAT_MAX] = {
1349 : [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
1350 : [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
1351 : [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
1352 : };
1353 :
1354 6430 : static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
1355 : {
1356 6430 : int set;
1357 :
1358 25720 : for (set = 0; set < FEAT_MAX; set++) {
1359 19290 : int i;
1360 19290 : struct attribute *attrs[2];
1361 19290 : struct attribute_group agroup = {
1362 : .name = "features",
1363 : .attrs = attrs,
1364 : };
1365 19290 : u64 features = get_features(fs_info, set);
1366 19290 : features &= ~supported_feature_masks[set];
1367 :
1368 19290 : if (!features)
1369 19290 : continue;
1370 :
1371 0 : attrs[1] = NULL;
1372 0 : for (i = 0; i < NUM_FEATURE_BITS; i++) {
1373 0 : struct btrfs_feature_attr *fa;
1374 :
1375 0 : if (!(features & (1ULL << i)))
1376 0 : continue;
1377 :
1378 0 : fa = &btrfs_feature_attrs[set][i];
1379 0 : attrs[0] = &fa->kobj_attr.attr;
1380 0 : if (add) {
1381 0 : int ret;
1382 0 : ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
1383 : &agroup);
1384 0 : if (ret)
1385 0 : return ret;
1386 : } else
1387 0 : sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
1388 : &agroup);
1389 : }
1390 :
1391 : }
1392 : return 0;
1393 : }
1394 :
1395 3228 : static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
1396 : {
1397 3228 : if (fs_devs->devinfo_kobj) {
1398 3215 : kobject_del(fs_devs->devinfo_kobj);
1399 3215 : kobject_put(fs_devs->devinfo_kobj);
1400 3215 : fs_devs->devinfo_kobj = NULL;
1401 : }
1402 :
1403 3228 : if (fs_devs->devices_kobj) {
1404 3215 : kobject_del(fs_devs->devices_kobj);
1405 3215 : kobject_put(fs_devs->devices_kobj);
1406 3215 : fs_devs->devices_kobj = NULL;
1407 : }
1408 :
1409 3228 : if (fs_devs->fsid_kobj.state_initialized) {
1410 3215 : kobject_del(&fs_devs->fsid_kobj);
1411 3215 : kobject_put(&fs_devs->fsid_kobj);
1412 3215 : wait_for_completion(&fs_devs->kobj_unregister);
1413 : }
1414 3228 : }
1415 :
1416 : /* when fs_devs is NULL it will remove all fsid kobject */
1417 3228 : void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
1418 : {
1419 3228 : struct list_head *fs_uuids = btrfs_get_fs_uuids();
1420 :
1421 3228 : if (fs_devs) {
1422 3228 : __btrfs_sysfs_remove_fsid(fs_devs);
1423 3228 : return;
1424 : }
1425 :
1426 0 : list_for_each_entry(fs_devs, fs_uuids, fs_list) {
1427 0 : __btrfs_sysfs_remove_fsid(fs_devs);
1428 : }
1429 : }
1430 :
1431 3215 : static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
1432 : {
1433 3215 : struct btrfs_device *device;
1434 3215 : struct btrfs_fs_devices *seed;
1435 :
1436 6431 : list_for_each_entry(device, &fs_devices->devices, dev_list)
1437 3216 : btrfs_sysfs_remove_device(device);
1438 :
1439 3215 : list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1440 0 : list_for_each_entry(device, &seed->devices, dev_list)
1441 0 : btrfs_sysfs_remove_device(device);
1442 : }
1443 3215 : }
1444 :
1445 3215 : void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
1446 : {
1447 3215 : struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
1448 :
1449 3215 : sysfs_remove_link(fsid_kobj, "bdi");
1450 :
1451 3215 : if (fs_info->space_info_kobj) {
1452 3215 : sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
1453 3215 : kobject_del(fs_info->space_info_kobj);
1454 3215 : kobject_put(fs_info->space_info_kobj);
1455 : }
1456 3215 : if (fs_info->discard_kobj) {
1457 3215 : sysfs_remove_files(fs_info->discard_kobj, discard_attrs);
1458 3215 : kobject_del(fs_info->discard_kobj);
1459 3215 : kobject_put(fs_info->discard_kobj);
1460 : }
1461 : #ifdef CONFIG_BTRFS_DEBUG
1462 : if (fs_info->debug_kobj) {
1463 : sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
1464 : kobject_del(fs_info->debug_kobj);
1465 : kobject_put(fs_info->debug_kobj);
1466 : }
1467 : #endif
1468 3215 : addrm_unknown_feature_attrs(fs_info, false);
1469 3215 : sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
1470 3215 : sysfs_remove_files(fsid_kobj, btrfs_attrs);
1471 3215 : btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
1472 3215 : }
1473 :
1474 : static const char * const btrfs_feature_set_names[FEAT_MAX] = {
1475 : [FEAT_COMPAT] = "compat",
1476 : [FEAT_COMPAT_RO] = "compat_ro",
1477 : [FEAT_INCOMPAT] = "incompat",
1478 : };
1479 :
1480 0 : const char *btrfs_feature_set_name(enum btrfs_feature_set set)
1481 : {
1482 0 : return btrfs_feature_set_names[set];
1483 : }
1484 :
1485 0 : char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
1486 : {
1487 0 : size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
1488 0 : int len = 0;
1489 0 : int i;
1490 0 : char *str;
1491 :
1492 0 : str = kmalloc(bufsize, GFP_KERNEL);
1493 0 : if (!str)
1494 : return str;
1495 :
1496 0 : for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1497 0 : const char *name;
1498 :
1499 0 : if (!(flags & (1ULL << i)))
1500 0 : continue;
1501 :
1502 0 : name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
1503 0 : len += scnprintf(str + len, bufsize - len, "%s%s",
1504 : len ? "," : "", name);
1505 : }
1506 :
1507 : return str;
1508 : }
1509 :
1510 11 : static void init_feature_attrs(void)
1511 : {
1512 11 : struct btrfs_feature_attr *fa;
1513 11 : int set, i;
1514 :
1515 11 : memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
1516 11 : memset(btrfs_unknown_feature_names, 0,
1517 : sizeof(btrfs_unknown_feature_names));
1518 :
1519 154 : for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
1520 143 : struct btrfs_feature_attr *sfa;
1521 143 : struct attribute *a = btrfs_supported_feature_attrs[i];
1522 143 : int bit;
1523 143 : sfa = attr_to_btrfs_feature_attr(a);
1524 143 : bit = ilog2(sfa->feature_bit);
1525 143 : fa = &btrfs_feature_attrs[sfa->feature_set][bit];
1526 :
1527 143 : fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
1528 : }
1529 :
1530 44 : for (set = 0; set < FEAT_MAX; set++) {
1531 2145 : for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
1532 2112 : char *name = btrfs_unknown_feature_names[set][i];
1533 2112 : fa = &btrfs_feature_attrs[set][i];
1534 :
1535 2112 : if (fa->kobj_attr.attr.name)
1536 143 : continue;
1537 :
1538 1969 : snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
1539 1969 : btrfs_feature_set_names[set], i);
1540 :
1541 1969 : fa->kobj_attr.attr.name = name;
1542 1969 : fa->kobj_attr.attr.mode = S_IRUGO;
1543 1969 : fa->feature_set = set;
1544 1969 : fa->feature_bit = 1ULL << i;
1545 : }
1546 : }
1547 11 : }
1548 :
1549 : /*
1550 : * Create a sysfs entry for a given block group type at path
1551 : * /sys/fs/btrfs/UUID/allocation/data/TYPE
1552 : */
1553 9615 : void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
1554 : {
1555 9615 : struct btrfs_fs_info *fs_info = cache->fs_info;
1556 9615 : struct btrfs_space_info *space_info = cache->space_info;
1557 9615 : struct raid_kobject *rkobj;
1558 9615 : const int index = btrfs_bg_flags_to_raid_index(cache->flags);
1559 9615 : unsigned int nofs_flag;
1560 9615 : int ret;
1561 :
1562 : /*
1563 : * Setup a NOFS context because kobject_add(), deep in its call chain,
1564 : * does GFP_KERNEL allocations, and we are often called in a context
1565 : * where if reclaim is triggered we can deadlock (we are either holding
1566 : * a transaction handle or some lock required for a transaction
1567 : * commit).
1568 : */
1569 9615 : nofs_flag = memalloc_nofs_save();
1570 :
1571 9615 : rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
1572 9615 : if (!rkobj) {
1573 0 : memalloc_nofs_restore(nofs_flag);
1574 0 : btrfs_warn(cache->fs_info,
1575 : "couldn't alloc memory for raid level kobject");
1576 0 : return;
1577 : }
1578 :
1579 9615 : rkobj->flags = cache->flags;
1580 9615 : kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
1581 :
1582 : /*
1583 : * We call this either on mount, or if we've created a block group for a
1584 : * new index type while running (i.e. when restriping). The running
1585 : * case is tricky because we could race with other threads, so we need
1586 : * to have this check to make sure we didn't already init the kobject.
1587 : *
1588 : * We don't have to protect on the free side because it only happens on
1589 : * unmount.
1590 : */
1591 9615 : spin_lock(&space_info->lock);
1592 9615 : if (space_info->block_group_kobjs[index]) {
1593 0 : spin_unlock(&space_info->lock);
1594 0 : kobject_put(&rkobj->kobj);
1595 0 : return;
1596 : } else {
1597 9615 : space_info->block_group_kobjs[index] = &rkobj->kobj;
1598 : }
1599 9615 : spin_unlock(&space_info->lock);
1600 :
1601 9615 : ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
1602 : btrfs_bg_type_to_raid_name(rkobj->flags));
1603 9615 : memalloc_nofs_restore(nofs_flag);
1604 9615 : if (ret) {
1605 0 : spin_lock(&space_info->lock);
1606 0 : space_info->block_group_kobjs[index] = NULL;
1607 0 : spin_unlock(&space_info->lock);
1608 0 : kobject_put(&rkobj->kobj);
1609 0 : btrfs_warn(fs_info,
1610 : "failed to add kobject for block cache, ignoring");
1611 0 : return;
1612 : }
1613 : }
1614 :
1615 : /*
1616 : * Remove sysfs directories for all block group types of a given space info and
1617 : * the space info as well
1618 : */
1619 9615 : void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
1620 : {
1621 9615 : int i;
1622 :
1623 96150 : for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1624 86535 : struct kobject *kobj;
1625 :
1626 86535 : kobj = space_info->block_group_kobjs[i];
1627 86535 : space_info->block_group_kobjs[i] = NULL;
1628 86535 : if (kobj) {
1629 9615 : kobject_del(kobj);
1630 9615 : kobject_put(kobj);
1631 : }
1632 : }
1633 9615 : kobject_del(&space_info->kobj);
1634 9615 : kobject_put(&space_info->kobj);
1635 9615 : }
1636 :
1637 9615 : static const char *alloc_name(u64 flags)
1638 : {
1639 9615 : switch (flags) {
1640 : case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
1641 : return "mixed";
1642 3185 : case BTRFS_BLOCK_GROUP_METADATA:
1643 3185 : return "metadata";
1644 3185 : case BTRFS_BLOCK_GROUP_DATA:
1645 3185 : return "data";
1646 3215 : case BTRFS_BLOCK_GROUP_SYSTEM:
1647 3215 : return "system";
1648 : default:
1649 0 : WARN_ON(1);
1650 0 : return "invalid-combination";
1651 : }
1652 : }
1653 :
1654 : /*
1655 : * Create a sysfs entry for a space info type at path
1656 : * /sys/fs/btrfs/UUID/allocation/TYPE
1657 : */
1658 9615 : int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
1659 : struct btrfs_space_info *space_info)
1660 : {
1661 9615 : int ret;
1662 :
1663 9615 : ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
1664 : fs_info->space_info_kobj, "%s",
1665 : alloc_name(space_info->flags));
1666 9615 : if (ret) {
1667 0 : kobject_put(&space_info->kobj);
1668 0 : return ret;
1669 : }
1670 :
1671 : return 0;
1672 : }
1673 :
1674 3216 : void btrfs_sysfs_remove_device(struct btrfs_device *device)
1675 : {
1676 3216 : struct kobject *devices_kobj;
1677 :
1678 : /*
1679 : * Seed fs_devices devices_kobj aren't used, fetch kobject from the
1680 : * fs_info::fs_devices.
1681 : */
1682 3216 : devices_kobj = device->fs_info->fs_devices->devices_kobj;
1683 3216 : ASSERT(devices_kobj);
1684 :
1685 3216 : if (device->bdev)
1686 3216 : sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name);
1687 :
1688 3216 : if (device->devid_kobj.state_initialized) {
1689 3216 : kobject_del(&device->devid_kobj);
1690 3216 : kobject_put(&device->devid_kobj);
1691 3216 : wait_for_completion(&device->kobj_unregister);
1692 : }
1693 3216 : }
1694 :
1695 0 : static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
1696 : struct kobj_attribute *a,
1697 : char *buf)
1698 : {
1699 0 : int val;
1700 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1701 : devid_kobj);
1702 :
1703 0 : val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
1704 :
1705 0 : return sysfs_emit(buf, "%d\n", val);
1706 : }
1707 : BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
1708 :
1709 0 : static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
1710 : struct kobj_attribute *a, char *buf)
1711 : {
1712 0 : int val;
1713 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1714 : devid_kobj);
1715 :
1716 0 : val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
1717 :
1718 0 : return sysfs_emit(buf, "%d\n", val);
1719 : }
1720 : BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
1721 :
1722 0 : static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
1723 : struct kobj_attribute *a,
1724 : char *buf)
1725 : {
1726 0 : int val;
1727 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1728 : devid_kobj);
1729 :
1730 0 : val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
1731 :
1732 0 : return sysfs_emit(buf, "%d\n", val);
1733 : }
1734 : BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
1735 :
1736 0 : static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj,
1737 : struct kobj_attribute *a,
1738 : char *buf)
1739 : {
1740 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1741 : devid_kobj);
1742 :
1743 0 : return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max));
1744 : }
1745 :
1746 1 : static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj,
1747 : struct kobj_attribute *a,
1748 : const char *buf, size_t len)
1749 : {
1750 1 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1751 : devid_kobj);
1752 1 : char *endptr;
1753 1 : unsigned long long limit;
1754 :
1755 1 : limit = memparse(buf, &endptr);
1756 1 : WRITE_ONCE(device->scrub_speed_max, limit);
1757 1 : return len;
1758 : }
1759 : BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show,
1760 : btrfs_devinfo_scrub_speed_max_store);
1761 :
1762 0 : static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
1763 : struct kobj_attribute *a, char *buf)
1764 : {
1765 0 : int val;
1766 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1767 : devid_kobj);
1768 :
1769 0 : val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
1770 :
1771 0 : return sysfs_emit(buf, "%d\n", val);
1772 : }
1773 : BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
1774 :
1775 0 : static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj,
1776 : struct kobj_attribute *a, char *buf)
1777 : {
1778 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1779 : devid_kobj);
1780 :
1781 0 : return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid);
1782 : }
1783 : BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show);
1784 :
1785 0 : static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj,
1786 : struct kobj_attribute *a, char *buf)
1787 : {
1788 0 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1789 : devid_kobj);
1790 :
1791 0 : if (!device->dev_stats_valid)
1792 0 : return sysfs_emit(buf, "invalid\n");
1793 :
1794 : /*
1795 : * Print all at once so we get a snapshot of all values from the same
1796 : * time. Keep them in sync and in order of definition of
1797 : * btrfs_dev_stat_values.
1798 : */
1799 0 : return sysfs_emit(buf,
1800 : "write_errs %d\n"
1801 : "read_errs %d\n"
1802 : "flush_errs %d\n"
1803 : "corruption_errs %d\n"
1804 : "generation_errs %d\n",
1805 : btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS),
1806 : btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS),
1807 : btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS),
1808 : btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS),
1809 : btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS));
1810 : }
1811 : BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show);
1812 :
1813 : /*
1814 : * Information about one device.
1815 : *
1816 : * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/
1817 : */
1818 : static struct attribute *devid_attrs[] = {
1819 : BTRFS_ATTR_PTR(devid, error_stats),
1820 : BTRFS_ATTR_PTR(devid, fsid),
1821 : BTRFS_ATTR_PTR(devid, in_fs_metadata),
1822 : BTRFS_ATTR_PTR(devid, missing),
1823 : BTRFS_ATTR_PTR(devid, replace_target),
1824 : BTRFS_ATTR_PTR(devid, scrub_speed_max),
1825 : BTRFS_ATTR_PTR(devid, writeable),
1826 : NULL
1827 : };
1828 : ATTRIBUTE_GROUPS(devid);
1829 :
1830 3216 : static void btrfs_release_devid_kobj(struct kobject *kobj)
1831 : {
1832 3216 : struct btrfs_device *device = container_of(kobj, struct btrfs_device,
1833 : devid_kobj);
1834 :
1835 3216 : memset(&device->devid_kobj, 0, sizeof(struct kobject));
1836 3216 : complete(&device->kobj_unregister);
1837 3216 : }
1838 :
1839 : static const struct kobj_type devid_ktype = {
1840 : .sysfs_ops = &kobj_sysfs_ops,
1841 : .default_groups = devid_groups,
1842 : .release = btrfs_release_devid_kobj,
1843 : };
1844 :
1845 3216 : int btrfs_sysfs_add_device(struct btrfs_device *device)
1846 : {
1847 3216 : int ret;
1848 3216 : unsigned int nofs_flag;
1849 3216 : struct kobject *devices_kobj;
1850 3216 : struct kobject *devinfo_kobj;
1851 :
1852 : /*
1853 : * Make sure we use the fs_info::fs_devices to fetch the kobjects even
1854 : * for the seed fs_devices
1855 : */
1856 3216 : devices_kobj = device->fs_info->fs_devices->devices_kobj;
1857 3216 : devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj;
1858 3216 : ASSERT(devices_kobj);
1859 3216 : ASSERT(devinfo_kobj);
1860 :
1861 3216 : nofs_flag = memalloc_nofs_save();
1862 :
1863 3216 : if (device->bdev) {
1864 3216 : struct kobject *disk_kobj = bdev_kobj(device->bdev);
1865 :
1866 3216 : ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name);
1867 3216 : if (ret) {
1868 0 : btrfs_warn(device->fs_info,
1869 : "creating sysfs device link for devid %llu failed: %d",
1870 : device->devid, ret);
1871 0 : goto out;
1872 : }
1873 : }
1874 :
1875 3216 : init_completion(&device->kobj_unregister);
1876 3216 : ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype,
1877 : devinfo_kobj, "%llu", device->devid);
1878 3216 : if (ret) {
1879 0 : kobject_put(&device->devid_kobj);
1880 0 : btrfs_warn(device->fs_info,
1881 : "devinfo init for devid %llu failed: %d",
1882 : device->devid, ret);
1883 : }
1884 :
1885 3216 : out:
1886 3216 : memalloc_nofs_restore(nofs_flag);
1887 3216 : return ret;
1888 : }
1889 :
1890 3215 : static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices)
1891 : {
1892 3215 : int ret;
1893 3215 : struct btrfs_device *device;
1894 3215 : struct btrfs_fs_devices *seed;
1895 :
1896 6431 : list_for_each_entry(device, &fs_devices->devices, dev_list) {
1897 3216 : ret = btrfs_sysfs_add_device(device);
1898 3216 : if (ret)
1899 0 : goto fail;
1900 : }
1901 :
1902 3215 : list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
1903 0 : list_for_each_entry(device, &seed->devices, dev_list) {
1904 0 : ret = btrfs_sysfs_add_device(device);
1905 0 : if (ret)
1906 0 : goto fail;
1907 : }
1908 : }
1909 :
1910 : return 0;
1911 :
1912 0 : fail:
1913 0 : btrfs_sysfs_remove_fs_devices(fs_devices);
1914 0 : return ret;
1915 : }
1916 :
1917 0 : void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
1918 : {
1919 0 : int ret;
1920 :
1921 0 : ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
1922 0 : if (ret)
1923 0 : pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
1924 : action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
1925 : &disk_to_dev(bdev->bd_disk)->kobj);
1926 0 : }
1927 :
1928 0 : void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices)
1929 :
1930 : {
1931 0 : char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
1932 :
1933 : /*
1934 : * Sprouting changes fsid of the mounted filesystem, rename the fsid
1935 : * directory
1936 : */
1937 0 : snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid);
1938 0 : if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
1939 0 : btrfs_warn(fs_devices->fs_info,
1940 : "sysfs: failed to create fsid for sprout");
1941 0 : }
1942 :
1943 0 : void btrfs_sysfs_update_devid(struct btrfs_device *device)
1944 : {
1945 0 : char tmp[24];
1946 :
1947 0 : snprintf(tmp, sizeof(tmp), "%llu", device->devid);
1948 :
1949 0 : if (kobject_rename(&device->devid_kobj, tmp))
1950 0 : btrfs_warn(device->fs_devices->fs_info,
1951 : "sysfs: failed to update devid for %llu",
1952 : device->devid);
1953 0 : }
1954 :
1955 : /* /sys/fs/btrfs/ entry */
1956 : static struct kset *btrfs_kset;
1957 :
1958 : /*
1959 : * Creates:
1960 : * /sys/fs/btrfs/UUID
1961 : *
1962 : * Can be called by the device discovery thread.
1963 : */
1964 3215 : int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
1965 : {
1966 3215 : int error;
1967 :
1968 3215 : init_completion(&fs_devs->kobj_unregister);
1969 3215 : fs_devs->fsid_kobj.kset = btrfs_kset;
1970 3215 : error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
1971 3215 : "%pU", fs_devs->fsid);
1972 3215 : if (error) {
1973 0 : kobject_put(&fs_devs->fsid_kobj);
1974 0 : return error;
1975 : }
1976 :
1977 3215 : fs_devs->devices_kobj = kobject_create_and_add("devices",
1978 : &fs_devs->fsid_kobj);
1979 3215 : if (!fs_devs->devices_kobj) {
1980 0 : btrfs_err(fs_devs->fs_info,
1981 : "failed to init sysfs device interface");
1982 0 : btrfs_sysfs_remove_fsid(fs_devs);
1983 0 : return -ENOMEM;
1984 : }
1985 :
1986 3215 : fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
1987 : &fs_devs->fsid_kobj);
1988 3215 : if (!fs_devs->devinfo_kobj) {
1989 0 : btrfs_err(fs_devs->fs_info,
1990 : "failed to init sysfs devinfo kobject");
1991 0 : btrfs_sysfs_remove_fsid(fs_devs);
1992 0 : return -ENOMEM;
1993 : }
1994 :
1995 : return 0;
1996 : }
1997 :
1998 3215 : int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
1999 : {
2000 3215 : int error;
2001 3215 : struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
2002 3215 : struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
2003 :
2004 3215 : error = btrfs_sysfs_add_fs_devices(fs_devs);
2005 3215 : if (error)
2006 : return error;
2007 :
2008 3215 : error = sysfs_create_files(fsid_kobj, btrfs_attrs);
2009 3215 : if (error) {
2010 0 : btrfs_sysfs_remove_fs_devices(fs_devs);
2011 0 : return error;
2012 : }
2013 :
2014 3215 : error = sysfs_create_group(fsid_kobj,
2015 : &btrfs_feature_attr_group);
2016 3215 : if (error)
2017 0 : goto failure;
2018 :
2019 : #ifdef CONFIG_BTRFS_DEBUG
2020 : fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
2021 : if (!fs_info->debug_kobj) {
2022 : error = -ENOMEM;
2023 : goto failure;
2024 : }
2025 :
2026 : error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
2027 : if (error)
2028 : goto failure;
2029 : #endif
2030 :
2031 : /* Discard directory */
2032 3215 : fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj);
2033 3215 : if (!fs_info->discard_kobj) {
2034 0 : error = -ENOMEM;
2035 0 : goto failure;
2036 : }
2037 :
2038 3215 : error = sysfs_create_files(fs_info->discard_kobj, discard_attrs);
2039 3215 : if (error)
2040 0 : goto failure;
2041 :
2042 3215 : error = addrm_unknown_feature_attrs(fs_info, true);
2043 3215 : if (error)
2044 0 : goto failure;
2045 :
2046 3215 : error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
2047 3215 : if (error)
2048 0 : goto failure;
2049 :
2050 3215 : fs_info->space_info_kobj = kobject_create_and_add("allocation",
2051 : fsid_kobj);
2052 3215 : if (!fs_info->space_info_kobj) {
2053 0 : error = -ENOMEM;
2054 0 : goto failure;
2055 : }
2056 :
2057 3215 : error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
2058 3215 : if (error)
2059 0 : goto failure;
2060 :
2061 : return 0;
2062 0 : failure:
2063 0 : btrfs_sysfs_remove_mounted(fs_info);
2064 0 : return error;
2065 : }
2066 :
2067 0 : static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj,
2068 : struct kobj_attribute *a,
2069 : char *buf)
2070 : {
2071 0 : struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
2072 0 : bool enabled;
2073 :
2074 0 : spin_lock(&fs_info->qgroup_lock);
2075 0 : enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON;
2076 0 : spin_unlock(&fs_info->qgroup_lock);
2077 :
2078 0 : return sysfs_emit(buf, "%d\n", enabled);
2079 : }
2080 : BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show);
2081 :
2082 0 : static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj,
2083 : struct kobj_attribute *a,
2084 : char *buf)
2085 : {
2086 0 : struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
2087 0 : bool inconsistent;
2088 :
2089 0 : spin_lock(&fs_info->qgroup_lock);
2090 0 : inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT);
2091 0 : spin_unlock(&fs_info->qgroup_lock);
2092 :
2093 0 : return sysfs_emit(buf, "%d\n", inconsistent);
2094 : }
2095 : BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show);
2096 :
2097 0 : static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj,
2098 : struct kobj_attribute *a,
2099 : char *buf)
2100 : {
2101 0 : struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
2102 0 : u8 result;
2103 :
2104 0 : spin_lock(&fs_info->qgroup_lock);
2105 0 : result = fs_info->qgroup_drop_subtree_thres;
2106 0 : spin_unlock(&fs_info->qgroup_lock);
2107 :
2108 0 : return sysfs_emit(buf, "%d\n", result);
2109 : }
2110 :
2111 0 : static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj,
2112 : struct kobj_attribute *a,
2113 : const char *buf, size_t len)
2114 : {
2115 0 : struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
2116 0 : u8 new_thres;
2117 0 : int ret;
2118 :
2119 0 : ret = kstrtou8(buf, 10, &new_thres);
2120 0 : if (ret)
2121 : return -EINVAL;
2122 :
2123 0 : if (new_thres > BTRFS_MAX_LEVEL)
2124 : return -EINVAL;
2125 :
2126 0 : spin_lock(&fs_info->qgroup_lock);
2127 0 : fs_info->qgroup_drop_subtree_thres = new_thres;
2128 0 : spin_unlock(&fs_info->qgroup_lock);
2129 :
2130 0 : return len;
2131 : }
2132 : BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show,
2133 : qgroup_drop_subtree_thres_store);
2134 :
2135 : /*
2136 : * Qgroups global info
2137 : *
2138 : * Path: /sys/fs/btrfs/<uuid>/qgroups/
2139 : */
2140 : static struct attribute *qgroups_attrs[] = {
2141 : BTRFS_ATTR_PTR(qgroups, enabled),
2142 : BTRFS_ATTR_PTR(qgroups, inconsistent),
2143 : BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold),
2144 : NULL
2145 : };
2146 : ATTRIBUTE_GROUPS(qgroups);
2147 :
2148 181 : static void qgroups_release(struct kobject *kobj)
2149 : {
2150 181 : kfree(kobj);
2151 181 : }
2152 :
2153 : static const struct kobj_type qgroups_ktype = {
2154 : .sysfs_ops = &kobj_sysfs_ops,
2155 : .default_groups = qgroups_groups,
2156 : .release = qgroups_release,
2157 : };
2158 :
2159 : static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
2160 : {
2161 0 : return to_fs_info(kobj->parent->parent);
2162 : }
2163 :
2164 : #define QGROUP_ATTR(_member, _show_name) \
2165 : static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
2166 : struct kobj_attribute *a, \
2167 : char *buf) \
2168 : { \
2169 : struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
2170 : struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
2171 : struct btrfs_qgroup, kobj); \
2172 : return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
2173 : } \
2174 : BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
2175 :
2176 : #define QGROUP_RSV_ATTR(_name, _type) \
2177 : static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
2178 : struct kobj_attribute *a, \
2179 : char *buf) \
2180 : { \
2181 : struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
2182 : struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
2183 : struct btrfs_qgroup, kobj); \
2184 : return btrfs_show_u64(&qgroup->rsv.values[_type], \
2185 : &fs_info->qgroup_lock, buf); \
2186 : } \
2187 : BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
2188 :
2189 0 : QGROUP_ATTR(rfer, referenced);
2190 0 : QGROUP_ATTR(excl, exclusive);
2191 0 : QGROUP_ATTR(max_rfer, max_referenced);
2192 0 : QGROUP_ATTR(max_excl, max_exclusive);
2193 0 : QGROUP_ATTR(lim_flags, limit_flags);
2194 0 : QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
2195 0 : QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
2196 0 : QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
2197 :
2198 : /*
2199 : * Qgroup information.
2200 : *
2201 : * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/
2202 : */
2203 : static struct attribute *qgroup_attrs[] = {
2204 : BTRFS_ATTR_PTR(qgroup, referenced),
2205 : BTRFS_ATTR_PTR(qgroup, exclusive),
2206 : BTRFS_ATTR_PTR(qgroup, max_referenced),
2207 : BTRFS_ATTR_PTR(qgroup, max_exclusive),
2208 : BTRFS_ATTR_PTR(qgroup, limit_flags),
2209 : BTRFS_ATTR_PTR(qgroup, rsv_data),
2210 : BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
2211 : BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
2212 : NULL
2213 : };
2214 : ATTRIBUTE_GROUPS(qgroup);
2215 :
2216 565 : static void qgroup_release(struct kobject *kobj)
2217 : {
2218 565 : struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
2219 :
2220 565 : memset(&qgroup->kobj, 0, sizeof(*kobj));
2221 565 : }
2222 :
2223 : static const struct kobj_type qgroup_ktype = {
2224 : .sysfs_ops = &kobj_sysfs_ops,
2225 : .release = qgroup_release,
2226 : .default_groups = qgroup_groups,
2227 : };
2228 :
2229 720 : int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
2230 : struct btrfs_qgroup *qgroup)
2231 : {
2232 720 : struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
2233 720 : int ret;
2234 :
2235 1440 : if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
2236 : return 0;
2237 720 : if (qgroup->kobj.state_initialized)
2238 : return 0;
2239 565 : if (!qgroups_kobj)
2240 : return -EINVAL;
2241 :
2242 565 : ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
2243 : "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
2244 : btrfs_qgroup_subvolid(qgroup->qgroupid));
2245 565 : if (ret < 0)
2246 0 : kobject_put(&qgroup->kobj);
2247 :
2248 : return ret;
2249 : }
2250 :
2251 3342 : void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
2252 : {
2253 3342 : struct btrfs_qgroup *qgroup;
2254 3342 : struct btrfs_qgroup *next;
2255 :
2256 6684 : if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
2257 : return;
2258 :
2259 6684 : rbtree_postorder_for_each_entry_safe(qgroup, next,
2260 : &fs_info->qgroup_tree, node)
2261 0 : btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
2262 3342 : if (fs_info->qgroups_kobj) {
2263 181 : kobject_del(fs_info->qgroups_kobj);
2264 181 : kobject_put(fs_info->qgroups_kobj);
2265 181 : fs_info->qgroups_kobj = NULL;
2266 : }
2267 : }
2268 :
2269 : /* Called when qgroups get initialized, thus there is no need for locking */
2270 181 : int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
2271 : {
2272 181 : struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
2273 181 : struct btrfs_qgroup *qgroup;
2274 181 : struct btrfs_qgroup *next;
2275 181 : int ret = 0;
2276 :
2277 362 : if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
2278 : return 0;
2279 :
2280 181 : ASSERT(fsid_kobj);
2281 181 : if (fs_info->qgroups_kobj)
2282 : return 0;
2283 :
2284 181 : fs_info->qgroups_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
2285 181 : if (!fs_info->qgroups_kobj)
2286 : return -ENOMEM;
2287 :
2288 181 : ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype,
2289 : fsid_kobj, "qgroups");
2290 181 : if (ret < 0)
2291 0 : goto out;
2292 :
2293 362 : rbtree_postorder_for_each_entry_safe(qgroup, next,
2294 : &fs_info->qgroup_tree, node) {
2295 0 : ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
2296 0 : if (ret < 0)
2297 0 : goto out;
2298 : }
2299 :
2300 181 : out:
2301 181 : if (ret < 0)
2302 0 : btrfs_sysfs_del_qgroups(fs_info);
2303 : return ret;
2304 : }
2305 :
2306 565 : void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
2307 : struct btrfs_qgroup *qgroup)
2308 : {
2309 1130 : if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
2310 : return;
2311 :
2312 565 : if (qgroup->kobj.state_initialized) {
2313 565 : kobject_del(&qgroup->kobj);
2314 565 : kobject_put(&qgroup->kobj);
2315 : }
2316 : }
2317 :
2318 : /*
2319 : * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
2320 : * values in superblock. Call after any changes to incompat/compat_ro flags
2321 : */
2322 32 : void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info)
2323 : {
2324 32 : struct kobject *fsid_kobj;
2325 32 : int ret;
2326 :
2327 32 : if (!fs_info)
2328 : return;
2329 :
2330 32 : fsid_kobj = &fs_info->fs_devices->fsid_kobj;
2331 32 : if (!fsid_kobj->state_initialized)
2332 : return;
2333 :
2334 32 : ret = sysfs_update_group(fsid_kobj, &btrfs_feature_attr_group);
2335 32 : if (ret < 0)
2336 0 : btrfs_warn(fs_info,
2337 : "failed to update /sys/fs/btrfs/%pU/features: %d",
2338 : fs_info->fs_devices->fsid, ret);
2339 : }
2340 :
2341 11 : int __init btrfs_init_sysfs(void)
2342 : {
2343 11 : int ret;
2344 :
2345 11 : btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
2346 11 : if (!btrfs_kset)
2347 : return -ENOMEM;
2348 :
2349 11 : init_feature_attrs();
2350 11 : ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
2351 11 : if (ret)
2352 0 : goto out2;
2353 11 : ret = sysfs_merge_group(&btrfs_kset->kobj,
2354 : &btrfs_static_feature_attr_group);
2355 11 : if (ret)
2356 0 : goto out_remove_group;
2357 :
2358 : #ifdef CONFIG_BTRFS_DEBUG
2359 : ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
2360 : if (ret) {
2361 : sysfs_unmerge_group(&btrfs_kset->kobj,
2362 : &btrfs_static_feature_attr_group);
2363 : goto out_remove_group;
2364 : }
2365 : #endif
2366 :
2367 : return 0;
2368 :
2369 : out_remove_group:
2370 0 : sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
2371 0 : out2:
2372 0 : kset_unregister(btrfs_kset);
2373 :
2374 0 : return ret;
2375 : }
2376 :
2377 0 : void __cold btrfs_exit_sysfs(void)
2378 : {
2379 0 : sysfs_unmerge_group(&btrfs_kset->kobj,
2380 : &btrfs_static_feature_attr_group);
2381 0 : sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
2382 : #ifdef CONFIG_BTRFS_DEBUG
2383 : sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
2384 : #endif
2385 0 : kset_unregister(btrfs_kset);
2386 0 : }
|
