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(a: 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 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
125 | if (set == FEAT_COMPAT) |
126 | return btrfs_super_compat_flags(s: disk_super); |
127 | else if (set == FEAT_COMPAT_RO) |
128 | return btrfs_super_compat_ro_flags(s: disk_super); |
129 | else |
130 | return btrfs_super_incompat_flags(s: 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 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
137 | if (set == FEAT_COMPAT) |
138 | btrfs_set_super_compat_flags(s: disk_super, val: features); |
139 | else if (set == FEAT_COMPAT_RO) |
140 | btrfs_set_super_compat_ro_flags(s: disk_super, val: features); |
141 | else |
142 | btrfs_set_super_incompat_flags(s: disk_super, val: features); |
143 | } |
144 | |
145 | static int can_modify_feature(struct btrfs_feature_attr *fa) |
146 | { |
147 | int val = 0; |
148 | u64 set, clear; |
149 | 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 | case FEAT_INCOMPAT: |
159 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; |
160 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; |
161 | break; |
162 | default: |
163 | pr_warn("btrfs: sysfs: unknown feature set %d\n" , |
164 | fa->feature_set); |
165 | return 0; |
166 | } |
167 | |
168 | if (set & fa->feature_bit) |
169 | val |= 1; |
170 | if (clear & fa->feature_bit) |
171 | val |= 2; |
172 | |
173 | return val; |
174 | } |
175 | |
176 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
177 | struct kobj_attribute *a, char *buf) |
178 | { |
179 | int val = 0; |
180 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
181 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
182 | if (fs_info) { |
183 | u64 features = get_features(fs_info, set: fa->feature_set); |
184 | if (features & fa->feature_bit) |
185 | val = 1; |
186 | } else |
187 | val = can_modify_feature(fa); |
188 | |
189 | return sysfs_emit(buf, fmt: "%d\n" , val); |
190 | } |
191 | |
192 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
193 | struct kobj_attribute *a, |
194 | const char *buf, size_t count) |
195 | { |
196 | struct btrfs_fs_info *fs_info; |
197 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
198 | u64 features, set, clear; |
199 | unsigned long val; |
200 | int ret; |
201 | |
202 | fs_info = to_fs_info(kobj); |
203 | if (!fs_info) |
204 | return -EPERM; |
205 | |
206 | if (sb_rdonly(sb: fs_info->sb)) |
207 | return -EROFS; |
208 | |
209 | ret = kstrtoul(s: skip_spaces(buf), base: 0, res: &val); |
210 | if (ret) |
211 | return ret; |
212 | |
213 | if (fa->feature_set == FEAT_COMPAT) { |
214 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; |
215 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; |
216 | } 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 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; |
221 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; |
222 | } |
223 | |
224 | features = get_features(fs_info, set: fa->feature_set); |
225 | |
226 | /* Nothing to do */ |
227 | if ((val && (features & fa->feature_bit)) || |
228 | (!val && !(features & fa->feature_bit))) |
229 | return count; |
230 | |
231 | if ((val && !(set & fa->feature_bit)) || |
232 | (!val && !(clear & fa->feature_bit))) { |
233 | btrfs_info(fs_info, |
234 | "%sabling feature %s on mounted fs is not supported." , |
235 | val ? "En" : "Dis" , fa->kobj_attr.attr.name); |
236 | return -EPERM; |
237 | } |
238 | |
239 | btrfs_info(fs_info, "%s %s feature flag" , |
240 | val ? "Setting" : "Clearing" , fa->kobj_attr.attr.name); |
241 | |
242 | spin_lock(lock: &fs_info->super_lock); |
243 | features = get_features(fs_info, set: fa->feature_set); |
244 | if (val) |
245 | features |= fa->feature_bit; |
246 | else |
247 | features &= ~fa->feature_bit; |
248 | set_features(fs_info, set: fa->feature_set, features); |
249 | spin_unlock(lock: &fs_info->super_lock); |
250 | |
251 | /* |
252 | * We don't want to do full transaction commit from inside sysfs |
253 | */ |
254 | set_bit(nr: BTRFS_FS_NEED_TRANS_COMMIT, addr: &fs_info->flags); |
255 | wake_up_process(tsk: fs_info->transaction_kthread); |
256 | |
257 | return count; |
258 | } |
259 | |
260 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
261 | struct attribute *attr, int unused) |
262 | { |
263 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
264 | umode_t mode = attr->mode; |
265 | |
266 | if (fs_info) { |
267 | struct btrfs_feature_attr *fa; |
268 | u64 features; |
269 | |
270 | fa = attr_to_btrfs_feature_attr(attr); |
271 | features = get_features(fs_info, set: fa->feature_set); |
272 | |
273 | if (can_modify_feature(fa)) |
274 | mode |= S_IWUSR; |
275 | else if (!(features & fa->feature_bit)) |
276 | mode = 0; |
277 | } |
278 | |
279 | 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 | BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA); |
295 | #ifdef CONFIG_BLK_DEV_ZONED |
296 | BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); |
297 | #endif |
298 | #ifdef CONFIG_BTRFS_DEBUG |
299 | /* Remove once support for extent tree v2 is feature complete */ |
300 | BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2); |
301 | /* Remove once support for raid stripe tree is feature complete. */ |
302 | BTRFS_FEAT_ATTR_INCOMPAT(raid_stripe_tree, RAID_STRIPE_TREE); |
303 | #endif |
304 | #ifdef CONFIG_FS_VERITY |
305 | BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY); |
306 | #endif |
307 | |
308 | /* |
309 | * Features which depend on feature bits and may differ between each fs. |
310 | * |
311 | * /sys/fs/btrfs/features - all available features implemented by this version |
312 | * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or |
313 | * can be changed on a mounted filesystem. |
314 | */ |
315 | static struct attribute *btrfs_supported_feature_attrs[] = { |
316 | BTRFS_FEAT_ATTR_PTR(default_subvol), |
317 | BTRFS_FEAT_ATTR_PTR(mixed_groups), |
318 | BTRFS_FEAT_ATTR_PTR(compress_lzo), |
319 | BTRFS_FEAT_ATTR_PTR(compress_zstd), |
320 | BTRFS_FEAT_ATTR_PTR(extended_iref), |
321 | BTRFS_FEAT_ATTR_PTR(raid56), |
322 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), |
323 | BTRFS_FEAT_ATTR_PTR(no_holes), |
324 | BTRFS_FEAT_ATTR_PTR(metadata_uuid), |
325 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
326 | BTRFS_FEAT_ATTR_PTR(raid1c34), |
327 | BTRFS_FEAT_ATTR_PTR(block_group_tree), |
328 | BTRFS_FEAT_ATTR_PTR(simple_quota), |
329 | #ifdef CONFIG_BLK_DEV_ZONED |
330 | BTRFS_FEAT_ATTR_PTR(zoned), |
331 | #endif |
332 | #ifdef CONFIG_BTRFS_DEBUG |
333 | BTRFS_FEAT_ATTR_PTR(extent_tree_v2), |
334 | BTRFS_FEAT_ATTR_PTR(raid_stripe_tree), |
335 | #endif |
336 | #ifdef CONFIG_FS_VERITY |
337 | BTRFS_FEAT_ATTR_PTR(verity), |
338 | #endif |
339 | NULL |
340 | }; |
341 | |
342 | static const struct attribute_group btrfs_feature_attr_group = { |
343 | .name = "features" , |
344 | .is_visible = btrfs_feature_visible, |
345 | .attrs = btrfs_supported_feature_attrs, |
346 | }; |
347 | |
348 | static ssize_t rmdir_subvol_show(struct kobject *kobj, |
349 | struct kobj_attribute *ka, char *buf) |
350 | { |
351 | return sysfs_emit(buf, fmt: "0\n" ); |
352 | } |
353 | BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); |
354 | |
355 | static ssize_t supported_checksums_show(struct kobject *kobj, |
356 | struct kobj_attribute *a, char *buf) |
357 | { |
358 | ssize_t ret = 0; |
359 | int i; |
360 | |
361 | for (i = 0; i < btrfs_get_num_csums(); i++) { |
362 | /* |
363 | * This "trick" only works as long as 'enum btrfs_csum_type' has |
364 | * no holes in it |
365 | */ |
366 | ret += sysfs_emit_at(buf, at: ret, fmt: "%s%s" , (i == 0 ? "" : " " ), |
367 | btrfs_super_csum_name(csum_type: i)); |
368 | |
369 | } |
370 | |
371 | ret += sysfs_emit_at(buf, at: ret, fmt: "\n" ); |
372 | return ret; |
373 | } |
374 | BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); |
375 | |
376 | static ssize_t send_stream_version_show(struct kobject *kobj, |
377 | struct kobj_attribute *ka, char *buf) |
378 | { |
379 | return sysfs_emit(buf, fmt: "%d\n" , BTRFS_SEND_STREAM_VERSION); |
380 | } |
381 | BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); |
382 | |
383 | static const char *rescue_opts[] = { |
384 | "usebackuproot" , |
385 | "nologreplay" , |
386 | "ignorebadroots" , |
387 | "ignoredatacsums" , |
388 | "all" , |
389 | }; |
390 | |
391 | static ssize_t supported_rescue_options_show(struct kobject *kobj, |
392 | struct kobj_attribute *a, |
393 | char *buf) |
394 | { |
395 | ssize_t ret = 0; |
396 | int i; |
397 | |
398 | for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) |
399 | ret += sysfs_emit_at(buf, at: ret, fmt: "%s%s" , (i ? " " : "" ), rescue_opts[i]); |
400 | ret += sysfs_emit_at(buf, at: ret, fmt: "\n" ); |
401 | return ret; |
402 | } |
403 | BTRFS_ATTR(static_feature, supported_rescue_options, |
404 | supported_rescue_options_show); |
405 | |
406 | static ssize_t supported_sectorsizes_show(struct kobject *kobj, |
407 | struct kobj_attribute *a, |
408 | char *buf) |
409 | { |
410 | ssize_t ret = 0; |
411 | |
412 | /* An artificial limit to only support 4K and PAGE_SIZE */ |
413 | if (PAGE_SIZE > SZ_4K) |
414 | ret += sysfs_emit_at(buf, at: ret, fmt: "%u " , SZ_4K); |
415 | ret += sysfs_emit_at(buf, at: ret, fmt: "%lu\n" , PAGE_SIZE); |
416 | |
417 | return ret; |
418 | } |
419 | BTRFS_ATTR(static_feature, supported_sectorsizes, |
420 | supported_sectorsizes_show); |
421 | |
422 | static ssize_t acl_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) |
423 | { |
424 | return sysfs_emit(buf, fmt: "%d\n" , IS_ENABLED(CONFIG_BTRFS_FS_POSIX_ACL)); |
425 | } |
426 | BTRFS_ATTR(static_feature, acl, acl_show); |
427 | |
428 | static ssize_t temp_fsid_supported_show(struct kobject *kobj, |
429 | struct kobj_attribute *a, char *buf) |
430 | { |
431 | return sysfs_emit(buf, fmt: "0\n" ); |
432 | } |
433 | BTRFS_ATTR(static_feature, temp_fsid, temp_fsid_supported_show); |
434 | |
435 | /* |
436 | * Features which only depend on kernel version. |
437 | * |
438 | * These are listed in /sys/fs/btrfs/features along with |
439 | * btrfs_supported_feature_attrs. |
440 | */ |
441 | static struct attribute *btrfs_supported_static_feature_attrs[] = { |
442 | BTRFS_ATTR_PTR(static_feature, acl), |
443 | BTRFS_ATTR_PTR(static_feature, rmdir_subvol), |
444 | BTRFS_ATTR_PTR(static_feature, supported_checksums), |
445 | BTRFS_ATTR_PTR(static_feature, send_stream_version), |
446 | BTRFS_ATTR_PTR(static_feature, supported_rescue_options), |
447 | BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), |
448 | BTRFS_ATTR_PTR(static_feature, temp_fsid), |
449 | NULL |
450 | }; |
451 | |
452 | static const struct attribute_group btrfs_static_feature_attr_group = { |
453 | .name = "features" , |
454 | .attrs = btrfs_supported_static_feature_attrs, |
455 | }; |
456 | |
457 | /* |
458 | * Discard statistics and tunables |
459 | */ |
460 | #define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj)) |
461 | |
462 | static ssize_t btrfs_discardable_bytes_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 sysfs_emit(buf, fmt: "%lld\n" , |
469 | atomic64_read(v: &fs_info->discard_ctl.discardable_bytes)); |
470 | } |
471 | BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); |
472 | |
473 | static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, |
474 | struct kobj_attribute *a, |
475 | char *buf) |
476 | { |
477 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
478 | |
479 | return sysfs_emit(buf, fmt: "%d\n" , |
480 | atomic_read(v: &fs_info->discard_ctl.discardable_extents)); |
481 | } |
482 | BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); |
483 | |
484 | static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, |
485 | struct kobj_attribute *a, |
486 | char *buf) |
487 | { |
488 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
489 | |
490 | return sysfs_emit(buf, fmt: "%llu\n" , |
491 | fs_info->discard_ctl.discard_bitmap_bytes); |
492 | } |
493 | BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); |
494 | |
495 | static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, |
496 | struct kobj_attribute *a, |
497 | char *buf) |
498 | { |
499 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
500 | |
501 | return sysfs_emit(buf, fmt: "%lld\n" , |
502 | atomic64_read(v: &fs_info->discard_ctl.discard_bytes_saved)); |
503 | } |
504 | BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); |
505 | |
506 | static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, |
507 | struct kobj_attribute *a, |
508 | char *buf) |
509 | { |
510 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
511 | |
512 | return sysfs_emit(buf, fmt: "%llu\n" , |
513 | fs_info->discard_ctl.discard_extent_bytes); |
514 | } |
515 | BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); |
516 | |
517 | static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, |
518 | struct kobj_attribute *a, |
519 | char *buf) |
520 | { |
521 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
522 | |
523 | return sysfs_emit(buf, fmt: "%u\n" , |
524 | READ_ONCE(fs_info->discard_ctl.iops_limit)); |
525 | } |
526 | |
527 | static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, |
528 | struct kobj_attribute *a, |
529 | const char *buf, size_t len) |
530 | { |
531 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
532 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; |
533 | u32 iops_limit; |
534 | int ret; |
535 | |
536 | ret = kstrtou32(s: buf, base: 10, res: &iops_limit); |
537 | if (ret) |
538 | return -EINVAL; |
539 | |
540 | WRITE_ONCE(discard_ctl->iops_limit, iops_limit); |
541 | btrfs_discard_calc_delay(discard_ctl); |
542 | btrfs_discard_schedule_work(discard_ctl, override: true); |
543 | return len; |
544 | } |
545 | BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, |
546 | btrfs_discard_iops_limit_store); |
547 | |
548 | static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, |
549 | struct kobj_attribute *a, |
550 | char *buf) |
551 | { |
552 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
553 | |
554 | return sysfs_emit(buf, fmt: "%u\n" , |
555 | READ_ONCE(fs_info->discard_ctl.kbps_limit)); |
556 | } |
557 | |
558 | static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, |
559 | struct kobj_attribute *a, |
560 | const char *buf, size_t len) |
561 | { |
562 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
563 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; |
564 | u32 kbps_limit; |
565 | int ret; |
566 | |
567 | ret = kstrtou32(s: buf, base: 10, res: &kbps_limit); |
568 | if (ret) |
569 | return -EINVAL; |
570 | |
571 | WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); |
572 | btrfs_discard_schedule_work(discard_ctl, override: true); |
573 | return len; |
574 | } |
575 | BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, |
576 | btrfs_discard_kbps_limit_store); |
577 | |
578 | static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, |
579 | struct kobj_attribute *a, |
580 | char *buf) |
581 | { |
582 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
583 | |
584 | return sysfs_emit(buf, fmt: "%llu\n" , |
585 | READ_ONCE(fs_info->discard_ctl.max_discard_size)); |
586 | } |
587 | |
588 | static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, |
589 | struct kobj_attribute *a, |
590 | const char *buf, size_t len) |
591 | { |
592 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); |
593 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; |
594 | u64 max_discard_size; |
595 | int ret; |
596 | |
597 | ret = kstrtou64(s: buf, base: 10, res: &max_discard_size); |
598 | if (ret) |
599 | return -EINVAL; |
600 | |
601 | WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); |
602 | |
603 | return len; |
604 | } |
605 | BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, |
606 | btrfs_discard_max_discard_size_store); |
607 | |
608 | /* |
609 | * Per-filesystem stats for discard (when mounted with discard=async). |
610 | * |
611 | * Path: /sys/fs/btrfs/<uuid>/discard/ |
612 | */ |
613 | static const struct attribute *discard_attrs[] = { |
614 | BTRFS_ATTR_PTR(discard, discardable_bytes), |
615 | BTRFS_ATTR_PTR(discard, discardable_extents), |
616 | BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), |
617 | BTRFS_ATTR_PTR(discard, discard_bytes_saved), |
618 | BTRFS_ATTR_PTR(discard, discard_extent_bytes), |
619 | BTRFS_ATTR_PTR(discard, iops_limit), |
620 | BTRFS_ATTR_PTR(discard, kbps_limit), |
621 | BTRFS_ATTR_PTR(discard, max_discard_size), |
622 | NULL, |
623 | }; |
624 | |
625 | #ifdef CONFIG_BTRFS_DEBUG |
626 | |
627 | /* |
628 | * Per-filesystem runtime debugging exported via sysfs. |
629 | * |
630 | * Path: /sys/fs/btrfs/UUID/debug/ |
631 | */ |
632 | static const struct attribute *btrfs_debug_mount_attrs[] = { |
633 | NULL, |
634 | }; |
635 | |
636 | /* |
637 | * Runtime debugging exported via sysfs, applies to all mounted filesystems. |
638 | * |
639 | * Path: /sys/fs/btrfs/debug |
640 | */ |
641 | static struct attribute *btrfs_debug_feature_attrs[] = { |
642 | NULL |
643 | }; |
644 | |
645 | static const struct attribute_group btrfs_debug_feature_attr_group = { |
646 | .name = "debug" , |
647 | .attrs = btrfs_debug_feature_attrs, |
648 | }; |
649 | |
650 | #endif |
651 | |
652 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
653 | { |
654 | u64 val; |
655 | if (lock) |
656 | spin_lock(lock); |
657 | val = *value_ptr; |
658 | if (lock) |
659 | spin_unlock(lock); |
660 | return sysfs_emit(buf, fmt: "%llu\n" , val); |
661 | } |
662 | |
663 | static ssize_t global_rsv_size_show(struct kobject *kobj, |
664 | struct kobj_attribute *ka, char *buf) |
665 | { |
666 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: kobj->parent); |
667 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
668 | return btrfs_show_u64(value_ptr: &block_rsv->size, lock: &block_rsv->lock, buf); |
669 | } |
670 | BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); |
671 | |
672 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, |
673 | struct kobj_attribute *a, char *buf) |
674 | { |
675 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: kobj->parent); |
676 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
677 | return btrfs_show_u64(value_ptr: &block_rsv->reserved, lock: &block_rsv->lock, buf); |
678 | } |
679 | BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); |
680 | |
681 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) |
682 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
683 | |
684 | static ssize_t raid_bytes_show(struct kobject *kobj, |
685 | struct kobj_attribute *attr, char *buf); |
686 | BTRFS_ATTR(raid, total_bytes, raid_bytes_show); |
687 | BTRFS_ATTR(raid, used_bytes, raid_bytes_show); |
688 | |
689 | static ssize_t raid_bytes_show(struct kobject *kobj, |
690 | struct kobj_attribute *attr, char *buf) |
691 | |
692 | { |
693 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); |
694 | struct btrfs_block_group *block_group; |
695 | int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); |
696 | u64 val = 0; |
697 | |
698 | down_read(sem: &sinfo->groups_sem); |
699 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { |
700 | if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) |
701 | val += block_group->length; |
702 | else |
703 | val += block_group->used; |
704 | } |
705 | up_read(sem: &sinfo->groups_sem); |
706 | return sysfs_emit(buf, fmt: "%llu\n" , val); |
707 | } |
708 | |
709 | /* |
710 | * Allocation information about block group profiles. |
711 | * |
712 | * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/ |
713 | */ |
714 | static struct attribute *raid_attrs[] = { |
715 | BTRFS_ATTR_PTR(raid, total_bytes), |
716 | BTRFS_ATTR_PTR(raid, used_bytes), |
717 | NULL |
718 | }; |
719 | ATTRIBUTE_GROUPS(raid); |
720 | |
721 | static void release_raid_kobj(struct kobject *kobj) |
722 | { |
723 | kfree(to_raid_kobj(kobj)); |
724 | } |
725 | |
726 | static const struct kobj_type btrfs_raid_ktype = { |
727 | .sysfs_ops = &kobj_sysfs_ops, |
728 | .release = release_raid_kobj, |
729 | .default_groups = raid_groups, |
730 | }; |
731 | |
732 | #define SPACE_INFO_ATTR(field) \ |
733 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ |
734 | struct kobj_attribute *a, \ |
735 | char *buf) \ |
736 | { \ |
737 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ |
738 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ |
739 | } \ |
740 | BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) |
741 | |
742 | static ssize_t btrfs_chunk_size_show(struct kobject *kobj, |
743 | struct kobj_attribute *a, char *buf) |
744 | { |
745 | struct btrfs_space_info *sinfo = to_space_info(kobj); |
746 | |
747 | return sysfs_emit(buf, fmt: "%llu\n" , READ_ONCE(sinfo->chunk_size)); |
748 | } |
749 | |
750 | /* |
751 | * Store new chunk size in space info. Can be called on a read-only filesystem. |
752 | * |
753 | * If the new chunk size value is larger than 10% of free space it is reduced |
754 | * to match that limit. Alignment must be to 256M and the system chunk size |
755 | * cannot be set. |
756 | */ |
757 | static ssize_t btrfs_chunk_size_store(struct kobject *kobj, |
758 | struct kobj_attribute *a, |
759 | const char *buf, size_t len) |
760 | { |
761 | struct btrfs_space_info *space_info = to_space_info(kobj); |
762 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: get_btrfs_kobj(kobj)); |
763 | char *retptr; |
764 | u64 val; |
765 | |
766 | if (!capable(CAP_SYS_ADMIN)) |
767 | return -EPERM; |
768 | |
769 | if (!fs_info->fs_devices) |
770 | return -EINVAL; |
771 | |
772 | if (btrfs_is_zoned(fs_info)) |
773 | return -EINVAL; |
774 | |
775 | /* System block type must not be changed. */ |
776 | if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM) |
777 | return -EPERM; |
778 | |
779 | val = memparse(ptr: buf, retptr: &retptr); |
780 | /* There could be trailing '\n', also catch any typos after the value */ |
781 | retptr = skip_spaces(retptr); |
782 | if (*retptr != 0 || val == 0) |
783 | return -EINVAL; |
784 | |
785 | val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE); |
786 | |
787 | /* Limit stripe size to 10% of available space. */ |
788 | val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val); |
789 | |
790 | /* Must be multiple of 256M. */ |
791 | val &= ~((u64)SZ_256M - 1); |
792 | |
793 | /* Must be at least 256M. */ |
794 | if (val < SZ_256M) |
795 | return -EINVAL; |
796 | |
797 | btrfs_update_space_info_chunk_size(space_info, chunk_size: val); |
798 | |
799 | return len; |
800 | } |
801 | |
802 | static ssize_t btrfs_size_classes_show(struct kobject *kobj, |
803 | struct kobj_attribute *a, char *buf) |
804 | { |
805 | struct btrfs_space_info *sinfo = to_space_info(kobj); |
806 | struct btrfs_block_group *bg; |
807 | u32 none = 0; |
808 | u32 small = 0; |
809 | u32 medium = 0; |
810 | u32 large = 0; |
811 | |
812 | for (int i = 0; i < BTRFS_NR_RAID_TYPES; ++i) { |
813 | down_read(sem: &sinfo->groups_sem); |
814 | list_for_each_entry(bg, &sinfo->block_groups[i], list) { |
815 | if (!btrfs_block_group_should_use_size_class(bg)) |
816 | continue; |
817 | switch (bg->size_class) { |
818 | case BTRFS_BG_SZ_NONE: |
819 | none++; |
820 | break; |
821 | case BTRFS_BG_SZ_SMALL: |
822 | small++; |
823 | break; |
824 | case BTRFS_BG_SZ_MEDIUM: |
825 | medium++; |
826 | break; |
827 | case BTRFS_BG_SZ_LARGE: |
828 | large++; |
829 | break; |
830 | } |
831 | } |
832 | up_read(sem: &sinfo->groups_sem); |
833 | } |
834 | return sysfs_emit(buf, fmt: "none %u\n" |
835 | "small %u\n" |
836 | "medium %u\n" |
837 | "large %u\n" , |
838 | none, small, medium, large); |
839 | } |
840 | |
841 | #ifdef CONFIG_BTRFS_DEBUG |
842 | /* |
843 | * Request chunk allocation with current chunk size. |
844 | */ |
845 | static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj, |
846 | struct kobj_attribute *a, |
847 | const char *buf, size_t len) |
848 | { |
849 | struct btrfs_space_info *space_info = to_space_info(kobj); |
850 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: get_btrfs_kobj(kobj)); |
851 | struct btrfs_trans_handle *trans; |
852 | bool val; |
853 | int ret; |
854 | |
855 | if (!capable(CAP_SYS_ADMIN)) |
856 | return -EPERM; |
857 | |
858 | if (sb_rdonly(sb: fs_info->sb)) |
859 | return -EROFS; |
860 | |
861 | ret = kstrtobool(s: buf, res: &val); |
862 | if (ret) |
863 | return ret; |
864 | |
865 | if (!val) |
866 | return -EINVAL; |
867 | |
868 | /* |
869 | * This is unsafe to be called from sysfs context and may cause |
870 | * unexpected problems. |
871 | */ |
872 | trans = btrfs_start_transaction(root: fs_info->tree_root, num_items: 0); |
873 | if (IS_ERR(ptr: trans)) |
874 | return PTR_ERR(ptr: trans); |
875 | ret = btrfs_force_chunk_alloc(trans, type: space_info->flags); |
876 | btrfs_end_transaction(trans); |
877 | |
878 | if (ret == 1) |
879 | return len; |
880 | |
881 | return -ENOSPC; |
882 | } |
883 | BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store); |
884 | |
885 | #endif |
886 | |
887 | SPACE_INFO_ATTR(flags); |
888 | SPACE_INFO_ATTR(total_bytes); |
889 | SPACE_INFO_ATTR(bytes_used); |
890 | SPACE_INFO_ATTR(bytes_pinned); |
891 | SPACE_INFO_ATTR(bytes_reserved); |
892 | SPACE_INFO_ATTR(bytes_may_use); |
893 | SPACE_INFO_ATTR(bytes_readonly); |
894 | SPACE_INFO_ATTR(bytes_zone_unusable); |
895 | SPACE_INFO_ATTR(disk_used); |
896 | SPACE_INFO_ATTR(disk_total); |
897 | BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store); |
898 | BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show); |
899 | |
900 | static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj, |
901 | struct kobj_attribute *a, |
902 | char *buf) |
903 | { |
904 | struct btrfs_space_info *space_info = to_space_info(kobj); |
905 | |
906 | return sysfs_emit(buf, fmt: "%d\n" , READ_ONCE(space_info->bg_reclaim_threshold)); |
907 | } |
908 | |
909 | static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj, |
910 | struct kobj_attribute *a, |
911 | const char *buf, size_t len) |
912 | { |
913 | struct btrfs_space_info *space_info = to_space_info(kobj); |
914 | int thresh; |
915 | int ret; |
916 | |
917 | ret = kstrtoint(s: buf, base: 10, res: &thresh); |
918 | if (ret) |
919 | return ret; |
920 | |
921 | if (thresh < 0 || thresh > 100) |
922 | return -EINVAL; |
923 | |
924 | WRITE_ONCE(space_info->bg_reclaim_threshold, thresh); |
925 | |
926 | return len; |
927 | } |
928 | |
929 | BTRFS_ATTR_RW(space_info, bg_reclaim_threshold, |
930 | btrfs_sinfo_bg_reclaim_threshold_show, |
931 | btrfs_sinfo_bg_reclaim_threshold_store); |
932 | |
933 | /* |
934 | * Allocation information about block group types. |
935 | * |
936 | * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/ |
937 | */ |
938 | static struct attribute *space_info_attrs[] = { |
939 | BTRFS_ATTR_PTR(space_info, flags), |
940 | BTRFS_ATTR_PTR(space_info, total_bytes), |
941 | BTRFS_ATTR_PTR(space_info, bytes_used), |
942 | BTRFS_ATTR_PTR(space_info, bytes_pinned), |
943 | BTRFS_ATTR_PTR(space_info, bytes_reserved), |
944 | BTRFS_ATTR_PTR(space_info, bytes_may_use), |
945 | BTRFS_ATTR_PTR(space_info, bytes_readonly), |
946 | BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), |
947 | BTRFS_ATTR_PTR(space_info, disk_used), |
948 | BTRFS_ATTR_PTR(space_info, disk_total), |
949 | BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold), |
950 | BTRFS_ATTR_PTR(space_info, chunk_size), |
951 | BTRFS_ATTR_PTR(space_info, size_classes), |
952 | #ifdef CONFIG_BTRFS_DEBUG |
953 | BTRFS_ATTR_PTR(space_info, force_chunk_alloc), |
954 | #endif |
955 | NULL, |
956 | }; |
957 | ATTRIBUTE_GROUPS(space_info); |
958 | |
959 | static void space_info_release(struct kobject *kobj) |
960 | { |
961 | struct btrfs_space_info *sinfo = to_space_info(kobj); |
962 | kfree(objp: sinfo); |
963 | } |
964 | |
965 | static const struct kobj_type space_info_ktype = { |
966 | .sysfs_ops = &kobj_sysfs_ops, |
967 | .release = space_info_release, |
968 | .default_groups = space_info_groups, |
969 | }; |
970 | |
971 | /* |
972 | * Allocation information about block groups. |
973 | * |
974 | * Path: /sys/fs/btrfs/<uuid>/allocation/ |
975 | */ |
976 | static const struct attribute *allocation_attrs[] = { |
977 | BTRFS_ATTR_PTR(allocation, global_rsv_reserved), |
978 | BTRFS_ATTR_PTR(allocation, global_rsv_size), |
979 | NULL, |
980 | }; |
981 | |
982 | static ssize_t btrfs_label_show(struct kobject *kobj, |
983 | struct kobj_attribute *a, char *buf) |
984 | { |
985 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
986 | char *label = fs_info->super_copy->label; |
987 | ssize_t ret; |
988 | |
989 | spin_lock(lock: &fs_info->super_lock); |
990 | ret = sysfs_emit(buf, fmt: label[0] ? "%s\n" : "%s" , label); |
991 | spin_unlock(lock: &fs_info->super_lock); |
992 | |
993 | return ret; |
994 | } |
995 | |
996 | static ssize_t btrfs_label_store(struct kobject *kobj, |
997 | struct kobj_attribute *a, |
998 | const char *buf, size_t len) |
999 | { |
1000 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1001 | size_t p_len; |
1002 | |
1003 | if (!fs_info) |
1004 | return -EPERM; |
1005 | |
1006 | if (sb_rdonly(sb: fs_info->sb)) |
1007 | return -EROFS; |
1008 | |
1009 | /* |
1010 | * p_len is the len until the first occurrence of either |
1011 | * '\n' or '\0' |
1012 | */ |
1013 | p_len = strcspn(buf, "\n" ); |
1014 | |
1015 | if (p_len >= BTRFS_LABEL_SIZE) |
1016 | return -EINVAL; |
1017 | |
1018 | spin_lock(lock: &fs_info->super_lock); |
1019 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
1020 | memcpy(fs_info->super_copy->label, buf, p_len); |
1021 | spin_unlock(lock: &fs_info->super_lock); |
1022 | |
1023 | /* |
1024 | * We don't want to do full transaction commit from inside sysfs |
1025 | */ |
1026 | set_bit(nr: BTRFS_FS_NEED_TRANS_COMMIT, addr: &fs_info->flags); |
1027 | wake_up_process(tsk: fs_info->transaction_kthread); |
1028 | |
1029 | return len; |
1030 | } |
1031 | BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); |
1032 | |
1033 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
1034 | struct kobj_attribute *a, char *buf) |
1035 | { |
1036 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1037 | |
1038 | return sysfs_emit(buf, fmt: "%u\n" , fs_info->super_copy->nodesize); |
1039 | } |
1040 | |
1041 | BTRFS_ATTR(, nodesize, btrfs_nodesize_show); |
1042 | |
1043 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, |
1044 | struct kobj_attribute *a, char *buf) |
1045 | { |
1046 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1047 | |
1048 | return sysfs_emit(buf, fmt: "%u\n" , fs_info->super_copy->sectorsize); |
1049 | } |
1050 | |
1051 | BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); |
1052 | |
1053 | static ssize_t btrfs_commit_stats_show(struct kobject *kobj, |
1054 | struct kobj_attribute *a, char *buf) |
1055 | { |
1056 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1057 | |
1058 | return sysfs_emit(buf, |
1059 | fmt: "commits %llu\n" |
1060 | "last_commit_ms %llu\n" |
1061 | "max_commit_ms %llu\n" |
1062 | "total_commit_ms %llu\n" , |
1063 | fs_info->commit_stats.commit_count, |
1064 | div_u64(dividend: fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC), |
1065 | div_u64(dividend: fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC), |
1066 | div_u64(dividend: fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC)); |
1067 | } |
1068 | |
1069 | static ssize_t btrfs_commit_stats_store(struct kobject *kobj, |
1070 | struct kobj_attribute *a, |
1071 | const char *buf, size_t len) |
1072 | { |
1073 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1074 | unsigned long val; |
1075 | int ret; |
1076 | |
1077 | if (!fs_info) |
1078 | return -EPERM; |
1079 | |
1080 | if (!capable(CAP_SYS_RESOURCE)) |
1081 | return -EPERM; |
1082 | |
1083 | ret = kstrtoul(s: buf, base: 10, res: &val); |
1084 | if (ret) |
1085 | return ret; |
1086 | if (val) |
1087 | return -EINVAL; |
1088 | |
1089 | WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0); |
1090 | |
1091 | return len; |
1092 | } |
1093 | BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store); |
1094 | |
1095 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, |
1096 | struct kobj_attribute *a, char *buf) |
1097 | { |
1098 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1099 | |
1100 | return sysfs_emit(buf, fmt: "%u\n" , fs_info->super_copy->sectorsize); |
1101 | } |
1102 | |
1103 | BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); |
1104 | |
1105 | static ssize_t quota_override_show(struct kobject *kobj, |
1106 | struct kobj_attribute *a, char *buf) |
1107 | { |
1108 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1109 | int quota_override; |
1110 | |
1111 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); |
1112 | return sysfs_emit(buf, fmt: "%d\n" , quota_override); |
1113 | } |
1114 | |
1115 | static ssize_t quota_override_store(struct kobject *kobj, |
1116 | struct kobj_attribute *a, |
1117 | const char *buf, size_t len) |
1118 | { |
1119 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1120 | unsigned long knob; |
1121 | int err; |
1122 | |
1123 | if (!fs_info) |
1124 | return -EPERM; |
1125 | |
1126 | if (!capable(CAP_SYS_RESOURCE)) |
1127 | return -EPERM; |
1128 | |
1129 | err = kstrtoul(s: buf, base: 10, res: &knob); |
1130 | if (err) |
1131 | return err; |
1132 | if (knob > 1) |
1133 | return -EINVAL; |
1134 | |
1135 | if (knob) |
1136 | set_bit(nr: BTRFS_FS_QUOTA_OVERRIDE, addr: &fs_info->flags); |
1137 | else |
1138 | clear_bit(nr: BTRFS_FS_QUOTA_OVERRIDE, addr: &fs_info->flags); |
1139 | |
1140 | return len; |
1141 | } |
1142 | |
1143 | BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); |
1144 | |
1145 | static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, |
1146 | struct kobj_attribute *a, char *buf) |
1147 | { |
1148 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1149 | |
1150 | return sysfs_emit(buf, fmt: "%pU\n" , fs_info->fs_devices->metadata_uuid); |
1151 | } |
1152 | |
1153 | BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); |
1154 | |
1155 | static ssize_t btrfs_checksum_show(struct kobject *kobj, |
1156 | struct kobj_attribute *a, char *buf) |
1157 | { |
1158 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1159 | u16 csum_type = btrfs_super_csum_type(s: fs_info->super_copy); |
1160 | |
1161 | return sysfs_emit(buf, fmt: "%s (%s)\n" , |
1162 | btrfs_super_csum_name(csum_type), |
1163 | crypto_shash_driver_name(tfm: fs_info->csum_shash)); |
1164 | } |
1165 | |
1166 | BTRFS_ATTR(, checksum, btrfs_checksum_show); |
1167 | |
1168 | static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, |
1169 | struct kobj_attribute *a, char *buf) |
1170 | { |
1171 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1172 | const char *str; |
1173 | |
1174 | switch (READ_ONCE(fs_info->exclusive_operation)) { |
1175 | case BTRFS_EXCLOP_NONE: |
1176 | str = "none\n" ; |
1177 | break; |
1178 | case BTRFS_EXCLOP_BALANCE: |
1179 | str = "balance\n" ; |
1180 | break; |
1181 | case BTRFS_EXCLOP_BALANCE_PAUSED: |
1182 | str = "balance paused\n" ; |
1183 | break; |
1184 | case BTRFS_EXCLOP_DEV_ADD: |
1185 | str = "device add\n" ; |
1186 | break; |
1187 | case BTRFS_EXCLOP_DEV_REMOVE: |
1188 | str = "device remove\n" ; |
1189 | break; |
1190 | case BTRFS_EXCLOP_DEV_REPLACE: |
1191 | str = "device replace\n" ; |
1192 | break; |
1193 | case BTRFS_EXCLOP_RESIZE: |
1194 | str = "resize\n" ; |
1195 | break; |
1196 | case BTRFS_EXCLOP_SWAP_ACTIVATE: |
1197 | str = "swap activate\n" ; |
1198 | break; |
1199 | default: |
1200 | str = "UNKNOWN\n" ; |
1201 | break; |
1202 | } |
1203 | return sysfs_emit(buf, fmt: "%s" , str); |
1204 | } |
1205 | BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); |
1206 | |
1207 | static ssize_t btrfs_generation_show(struct kobject *kobj, |
1208 | struct kobj_attribute *a, char *buf) |
1209 | { |
1210 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1211 | |
1212 | return sysfs_emit(buf, fmt: "%llu\n" , btrfs_get_fs_generation(fs_info)); |
1213 | } |
1214 | BTRFS_ATTR(, generation, btrfs_generation_show); |
1215 | |
1216 | static ssize_t btrfs_temp_fsid_show(struct kobject *kobj, |
1217 | struct kobj_attribute *a, char *buf) |
1218 | { |
1219 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1220 | |
1221 | return sysfs_emit(buf, fmt: "%d\n" , fs_info->fs_devices->temp_fsid); |
1222 | } |
1223 | BTRFS_ATTR(, temp_fsid, btrfs_temp_fsid_show); |
1224 | |
1225 | static const char * const btrfs_read_policy_name[] = { "pid" }; |
1226 | |
1227 | static ssize_t btrfs_read_policy_show(struct kobject *kobj, |
1228 | struct kobj_attribute *a, char *buf) |
1229 | { |
1230 | struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); |
1231 | const enum btrfs_read_policy policy = READ_ONCE(fs_devices->read_policy); |
1232 | ssize_t ret = 0; |
1233 | int i; |
1234 | |
1235 | for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { |
1236 | if (policy == i) |
1237 | ret += sysfs_emit_at(buf, at: ret, fmt: "%s[%s]" , |
1238 | (ret == 0 ? "" : " " ), |
1239 | btrfs_read_policy_name[i]); |
1240 | else |
1241 | ret += sysfs_emit_at(buf, at: ret, fmt: "%s%s" , |
1242 | (ret == 0 ? "" : " " ), |
1243 | btrfs_read_policy_name[i]); |
1244 | } |
1245 | |
1246 | ret += sysfs_emit_at(buf, at: ret, fmt: "\n" ); |
1247 | |
1248 | return ret; |
1249 | } |
1250 | |
1251 | static ssize_t btrfs_read_policy_store(struct kobject *kobj, |
1252 | struct kobj_attribute *a, |
1253 | const char *buf, size_t len) |
1254 | { |
1255 | struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); |
1256 | int i; |
1257 | |
1258 | for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { |
1259 | if (sysfs_streq(s1: buf, s2: btrfs_read_policy_name[i])) { |
1260 | if (i != READ_ONCE(fs_devices->read_policy)) { |
1261 | WRITE_ONCE(fs_devices->read_policy, i); |
1262 | btrfs_info(fs_devices->fs_info, |
1263 | "read policy set to '%s'" , |
1264 | btrfs_read_policy_name[i]); |
1265 | } |
1266 | return len; |
1267 | } |
1268 | } |
1269 | |
1270 | return -EINVAL; |
1271 | } |
1272 | BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); |
1273 | |
1274 | static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, |
1275 | struct kobj_attribute *a, |
1276 | char *buf) |
1277 | { |
1278 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1279 | |
1280 | return sysfs_emit(buf, fmt: "%d\n" , READ_ONCE(fs_info->bg_reclaim_threshold)); |
1281 | } |
1282 | |
1283 | static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, |
1284 | struct kobj_attribute *a, |
1285 | const char *buf, size_t len) |
1286 | { |
1287 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
1288 | int thresh; |
1289 | int ret; |
1290 | |
1291 | ret = kstrtoint(s: buf, base: 10, res: &thresh); |
1292 | if (ret) |
1293 | return ret; |
1294 | |
1295 | #ifdef CONFIG_BTRFS_DEBUG |
1296 | if (thresh != 0 && (thresh > 100)) |
1297 | return -EINVAL; |
1298 | #else |
1299 | if (thresh != 0 && (thresh <= 50 || thresh > 100)) |
1300 | return -EINVAL; |
1301 | #endif |
1302 | |
1303 | WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh); |
1304 | |
1305 | return len; |
1306 | } |
1307 | BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, |
1308 | btrfs_bg_reclaim_threshold_store); |
1309 | |
1310 | #ifdef CONFIG_BTRFS_DEBUG |
1311 | static ssize_t btrfs_offload_csum_show(struct kobject *kobj, |
1312 | struct kobj_attribute *a, char *buf) |
1313 | { |
1314 | struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); |
1315 | |
1316 | switch (READ_ONCE(fs_devices->offload_csum_mode)) { |
1317 | case BTRFS_OFFLOAD_CSUM_AUTO: |
1318 | return sysfs_emit(buf, fmt: "auto\n" ); |
1319 | case BTRFS_OFFLOAD_CSUM_FORCE_ON: |
1320 | return sysfs_emit(buf, fmt: "1\n" ); |
1321 | case BTRFS_OFFLOAD_CSUM_FORCE_OFF: |
1322 | return sysfs_emit(buf, fmt: "0\n" ); |
1323 | default: |
1324 | WARN_ON(1); |
1325 | return -EINVAL; |
1326 | } |
1327 | } |
1328 | |
1329 | static ssize_t btrfs_offload_csum_store(struct kobject *kobj, |
1330 | struct kobj_attribute *a, const char *buf, |
1331 | size_t len) |
1332 | { |
1333 | struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); |
1334 | int ret; |
1335 | bool val; |
1336 | |
1337 | ret = kstrtobool(s: buf, res: &val); |
1338 | if (ret == 0) |
1339 | WRITE_ONCE(fs_devices->offload_csum_mode, |
1340 | val ? BTRFS_OFFLOAD_CSUM_FORCE_ON : BTRFS_OFFLOAD_CSUM_FORCE_OFF); |
1341 | else if (ret == -EINVAL && sysfs_streq(s1: buf, s2: "auto" )) |
1342 | WRITE_ONCE(fs_devices->offload_csum_mode, BTRFS_OFFLOAD_CSUM_AUTO); |
1343 | else |
1344 | return -EINVAL; |
1345 | |
1346 | return len; |
1347 | } |
1348 | BTRFS_ATTR_RW(, offload_csum, btrfs_offload_csum_show, btrfs_offload_csum_store); |
1349 | #endif |
1350 | |
1351 | /* |
1352 | * Per-filesystem information and stats. |
1353 | * |
1354 | * Path: /sys/fs/btrfs/<uuid>/ |
1355 | */ |
1356 | static const struct attribute *btrfs_attrs[] = { |
1357 | BTRFS_ATTR_PTR(, label), |
1358 | BTRFS_ATTR_PTR(, nodesize), |
1359 | BTRFS_ATTR_PTR(, sectorsize), |
1360 | BTRFS_ATTR_PTR(, clone_alignment), |
1361 | BTRFS_ATTR_PTR(, quota_override), |
1362 | BTRFS_ATTR_PTR(, metadata_uuid), |
1363 | BTRFS_ATTR_PTR(, checksum), |
1364 | BTRFS_ATTR_PTR(, exclusive_operation), |
1365 | BTRFS_ATTR_PTR(, generation), |
1366 | BTRFS_ATTR_PTR(, read_policy), |
1367 | BTRFS_ATTR_PTR(, bg_reclaim_threshold), |
1368 | BTRFS_ATTR_PTR(, commit_stats), |
1369 | BTRFS_ATTR_PTR(, temp_fsid), |
1370 | #ifdef CONFIG_BTRFS_DEBUG |
1371 | BTRFS_ATTR_PTR(, offload_csum), |
1372 | #endif |
1373 | NULL, |
1374 | }; |
1375 | |
1376 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
1377 | { |
1378 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
1379 | |
1380 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
1381 | complete(&fs_devs->kobj_unregister); |
1382 | } |
1383 | |
1384 | static const struct kobj_type btrfs_ktype = { |
1385 | .sysfs_ops = &kobj_sysfs_ops, |
1386 | .release = btrfs_release_fsid_kobj, |
1387 | }; |
1388 | |
1389 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
1390 | { |
1391 | if (kobj->ktype != &btrfs_ktype) |
1392 | return NULL; |
1393 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
1394 | } |
1395 | |
1396 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
1397 | { |
1398 | if (kobj->ktype != &btrfs_ktype) |
1399 | return NULL; |
1400 | return to_fs_devs(kobj)->fs_info; |
1401 | } |
1402 | |
1403 | static struct kobject *get_btrfs_kobj(struct kobject *kobj) |
1404 | { |
1405 | while (kobj) { |
1406 | if (kobj->ktype == &btrfs_ktype) |
1407 | return kobj; |
1408 | kobj = kobj->parent; |
1409 | } |
1410 | return NULL; |
1411 | } |
1412 | |
1413 | #define NUM_FEATURE_BITS 64 |
1414 | #define BTRFS_FEATURE_NAME_MAX 13 |
1415 | static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; |
1416 | static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; |
1417 | |
1418 | static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) == |
1419 | ARRAY_SIZE(btrfs_feature_attrs)); |
1420 | static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) == |
1421 | ARRAY_SIZE(btrfs_feature_attrs[0])); |
1422 | |
1423 | static const u64 supported_feature_masks[FEAT_MAX] = { |
1424 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
1425 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, |
1426 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, |
1427 | }; |
1428 | |
1429 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) |
1430 | { |
1431 | int set; |
1432 | |
1433 | for (set = 0; set < FEAT_MAX; set++) { |
1434 | int i; |
1435 | struct attribute *attrs[2]; |
1436 | struct attribute_group agroup = { |
1437 | .name = "features" , |
1438 | .attrs = attrs, |
1439 | }; |
1440 | u64 features = get_features(fs_info, set); |
1441 | features &= ~supported_feature_masks[set]; |
1442 | |
1443 | if (!features) |
1444 | continue; |
1445 | |
1446 | attrs[1] = NULL; |
1447 | for (i = 0; i < NUM_FEATURE_BITS; i++) { |
1448 | struct btrfs_feature_attr *fa; |
1449 | |
1450 | if (!(features & (1ULL << i))) |
1451 | continue; |
1452 | |
1453 | fa = &btrfs_feature_attrs[set][i]; |
1454 | attrs[0] = &fa->kobj_attr.attr; |
1455 | if (add) { |
1456 | int ret; |
1457 | ret = sysfs_merge_group(kobj: &fs_info->fs_devices->fsid_kobj, |
1458 | grp: &agroup); |
1459 | if (ret) |
1460 | return ret; |
1461 | } else |
1462 | sysfs_unmerge_group(kobj: &fs_info->fs_devices->fsid_kobj, |
1463 | grp: &agroup); |
1464 | } |
1465 | |
1466 | } |
1467 | return 0; |
1468 | } |
1469 | |
1470 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
1471 | { |
1472 | if (fs_devs->devinfo_kobj) { |
1473 | kobject_del(kobj: fs_devs->devinfo_kobj); |
1474 | kobject_put(kobj: fs_devs->devinfo_kobj); |
1475 | fs_devs->devinfo_kobj = NULL; |
1476 | } |
1477 | |
1478 | if (fs_devs->devices_kobj) { |
1479 | kobject_del(kobj: fs_devs->devices_kobj); |
1480 | kobject_put(kobj: fs_devs->devices_kobj); |
1481 | fs_devs->devices_kobj = NULL; |
1482 | } |
1483 | |
1484 | if (fs_devs->fsid_kobj.state_initialized) { |
1485 | kobject_del(kobj: &fs_devs->fsid_kobj); |
1486 | kobject_put(kobj: &fs_devs->fsid_kobj); |
1487 | wait_for_completion(&fs_devs->kobj_unregister); |
1488 | } |
1489 | } |
1490 | |
1491 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1492 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
1493 | { |
1494 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); |
1495 | |
1496 | if (fs_devs) { |
1497 | __btrfs_sysfs_remove_fsid(fs_devs); |
1498 | return; |
1499 | } |
1500 | |
1501 | list_for_each_entry(fs_devs, fs_uuids, fs_list) { |
1502 | __btrfs_sysfs_remove_fsid(fs_devs); |
1503 | } |
1504 | } |
1505 | |
1506 | static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) |
1507 | { |
1508 | struct btrfs_device *device; |
1509 | struct btrfs_fs_devices *seed; |
1510 | |
1511 | list_for_each_entry(device, &fs_devices->devices, dev_list) |
1512 | btrfs_sysfs_remove_device(device); |
1513 | |
1514 | list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { |
1515 | list_for_each_entry(device, &seed->devices, dev_list) |
1516 | btrfs_sysfs_remove_device(device); |
1517 | } |
1518 | } |
1519 | |
1520 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
1521 | { |
1522 | struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; |
1523 | |
1524 | sysfs_remove_link(kobj: fsid_kobj, name: "bdi" ); |
1525 | |
1526 | if (fs_info->space_info_kobj) { |
1527 | sysfs_remove_files(kobj: fs_info->space_info_kobj, attr: allocation_attrs); |
1528 | kobject_del(kobj: fs_info->space_info_kobj); |
1529 | kobject_put(kobj: fs_info->space_info_kobj); |
1530 | } |
1531 | if (fs_info->discard_kobj) { |
1532 | sysfs_remove_files(kobj: fs_info->discard_kobj, attr: discard_attrs); |
1533 | kobject_del(kobj: fs_info->discard_kobj); |
1534 | kobject_put(kobj: fs_info->discard_kobj); |
1535 | } |
1536 | #ifdef CONFIG_BTRFS_DEBUG |
1537 | if (fs_info->debug_kobj) { |
1538 | sysfs_remove_files(kobj: fs_info->debug_kobj, attr: btrfs_debug_mount_attrs); |
1539 | kobject_del(kobj: fs_info->debug_kobj); |
1540 | kobject_put(kobj: fs_info->debug_kobj); |
1541 | } |
1542 | #endif |
1543 | addrm_unknown_feature_attrs(fs_info, add: false); |
1544 | sysfs_remove_group(kobj: fsid_kobj, grp: &btrfs_feature_attr_group); |
1545 | sysfs_remove_files(kobj: fsid_kobj, attr: btrfs_attrs); |
1546 | btrfs_sysfs_remove_fs_devices(fs_devices: fs_info->fs_devices); |
1547 | } |
1548 | |
1549 | static const char * const btrfs_feature_set_names[FEAT_MAX] = { |
1550 | [FEAT_COMPAT] = "compat" , |
1551 | [FEAT_COMPAT_RO] = "compat_ro" , |
1552 | [FEAT_INCOMPAT] = "incompat" , |
1553 | }; |
1554 | |
1555 | const char *btrfs_feature_set_name(enum btrfs_feature_set set) |
1556 | { |
1557 | return btrfs_feature_set_names[set]; |
1558 | } |
1559 | |
1560 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
1561 | { |
1562 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ |
1563 | int len = 0; |
1564 | int i; |
1565 | char *str; |
1566 | |
1567 | str = kmalloc(size: bufsize, GFP_KERNEL); |
1568 | if (!str) |
1569 | return str; |
1570 | |
1571 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { |
1572 | const char *name; |
1573 | |
1574 | if (!(flags & (1ULL << i))) |
1575 | continue; |
1576 | |
1577 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; |
1578 | len += scnprintf(buf: str + len, size: bufsize - len, fmt: "%s%s" , |
1579 | len ? "," : "" , name); |
1580 | } |
1581 | |
1582 | return str; |
1583 | } |
1584 | |
1585 | static void init_feature_attrs(void) |
1586 | { |
1587 | struct btrfs_feature_attr *fa; |
1588 | int set, i; |
1589 | |
1590 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
1591 | memset(btrfs_unknown_feature_names, 0, |
1592 | sizeof(btrfs_unknown_feature_names)); |
1593 | |
1594 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
1595 | struct btrfs_feature_attr *sfa; |
1596 | struct attribute *a = btrfs_supported_feature_attrs[i]; |
1597 | int bit; |
1598 | sfa = attr_to_btrfs_feature_attr(attr: a); |
1599 | bit = ilog2(sfa->feature_bit); |
1600 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; |
1601 | |
1602 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; |
1603 | } |
1604 | |
1605 | for (set = 0; set < FEAT_MAX; set++) { |
1606 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { |
1607 | char *name = btrfs_unknown_feature_names[set][i]; |
1608 | fa = &btrfs_feature_attrs[set][i]; |
1609 | |
1610 | if (fa->kobj_attr.attr.name) |
1611 | continue; |
1612 | |
1613 | snprintf(buf: name, BTRFS_FEATURE_NAME_MAX, fmt: "%s:%u" , |
1614 | btrfs_feature_set_names[set], i); |
1615 | |
1616 | fa->kobj_attr.attr.name = name; |
1617 | fa->kobj_attr.attr.mode = S_IRUGO; |
1618 | fa->feature_set = set; |
1619 | fa->feature_bit = 1ULL << i; |
1620 | } |
1621 | } |
1622 | } |
1623 | |
1624 | /* |
1625 | * Create a sysfs entry for a given block group type at path |
1626 | * /sys/fs/btrfs/UUID/allocation/data/TYPE |
1627 | */ |
1628 | void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) |
1629 | { |
1630 | struct btrfs_fs_info *fs_info = cache->fs_info; |
1631 | struct btrfs_space_info *space_info = cache->space_info; |
1632 | struct raid_kobject *rkobj; |
1633 | const int index = btrfs_bg_flags_to_raid_index(flags: cache->flags); |
1634 | unsigned int nofs_flag; |
1635 | int ret; |
1636 | |
1637 | /* |
1638 | * Setup a NOFS context because kobject_add(), deep in its call chain, |
1639 | * does GFP_KERNEL allocations, and we are often called in a context |
1640 | * where if reclaim is triggered we can deadlock (we are either holding |
1641 | * a transaction handle or some lock required for a transaction |
1642 | * commit). |
1643 | */ |
1644 | nofs_flag = memalloc_nofs_save(); |
1645 | |
1646 | rkobj = kzalloc(size: sizeof(*rkobj), GFP_NOFS); |
1647 | if (!rkobj) { |
1648 | memalloc_nofs_restore(flags: nofs_flag); |
1649 | btrfs_warn(cache->fs_info, |
1650 | "couldn't alloc memory for raid level kobject" ); |
1651 | return; |
1652 | } |
1653 | |
1654 | rkobj->flags = cache->flags; |
1655 | kobject_init(kobj: &rkobj->kobj, ktype: &btrfs_raid_ktype); |
1656 | |
1657 | /* |
1658 | * We call this either on mount, or if we've created a block group for a |
1659 | * new index type while running (i.e. when restriping). The running |
1660 | * case is tricky because we could race with other threads, so we need |
1661 | * to have this check to make sure we didn't already init the kobject. |
1662 | * |
1663 | * We don't have to protect on the free side because it only happens on |
1664 | * unmount. |
1665 | */ |
1666 | spin_lock(lock: &space_info->lock); |
1667 | if (space_info->block_group_kobjs[index]) { |
1668 | spin_unlock(lock: &space_info->lock); |
1669 | kobject_put(kobj: &rkobj->kobj); |
1670 | return; |
1671 | } else { |
1672 | space_info->block_group_kobjs[index] = &rkobj->kobj; |
1673 | } |
1674 | spin_unlock(lock: &space_info->lock); |
1675 | |
1676 | ret = kobject_add(kobj: &rkobj->kobj, parent: &space_info->kobj, fmt: "%s" , |
1677 | btrfs_bg_type_to_raid_name(flags: rkobj->flags)); |
1678 | memalloc_nofs_restore(flags: nofs_flag); |
1679 | if (ret) { |
1680 | spin_lock(lock: &space_info->lock); |
1681 | space_info->block_group_kobjs[index] = NULL; |
1682 | spin_unlock(lock: &space_info->lock); |
1683 | kobject_put(kobj: &rkobj->kobj); |
1684 | btrfs_warn(fs_info, |
1685 | "failed to add kobject for block cache, ignoring" ); |
1686 | return; |
1687 | } |
1688 | } |
1689 | |
1690 | /* |
1691 | * Remove sysfs directories for all block group types of a given space info and |
1692 | * the space info as well |
1693 | */ |
1694 | void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) |
1695 | { |
1696 | int i; |
1697 | |
1698 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
1699 | struct kobject *kobj; |
1700 | |
1701 | kobj = space_info->block_group_kobjs[i]; |
1702 | space_info->block_group_kobjs[i] = NULL; |
1703 | if (kobj) { |
1704 | kobject_del(kobj); |
1705 | kobject_put(kobj); |
1706 | } |
1707 | } |
1708 | kobject_del(kobj: &space_info->kobj); |
1709 | kobject_put(kobj: &space_info->kobj); |
1710 | } |
1711 | |
1712 | static const char *alloc_name(u64 flags) |
1713 | { |
1714 | switch (flags) { |
1715 | case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: |
1716 | return "mixed" ; |
1717 | case BTRFS_BLOCK_GROUP_METADATA: |
1718 | return "metadata" ; |
1719 | case BTRFS_BLOCK_GROUP_DATA: |
1720 | return "data" ; |
1721 | case BTRFS_BLOCK_GROUP_SYSTEM: |
1722 | return "system" ; |
1723 | default: |
1724 | WARN_ON(1); |
1725 | return "invalid-combination" ; |
1726 | } |
1727 | } |
1728 | |
1729 | /* |
1730 | * Create a sysfs entry for a space info type at path |
1731 | * /sys/fs/btrfs/UUID/allocation/TYPE |
1732 | */ |
1733 | int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, |
1734 | struct btrfs_space_info *space_info) |
1735 | { |
1736 | int ret; |
1737 | |
1738 | ret = kobject_init_and_add(kobj: &space_info->kobj, ktype: &space_info_ktype, |
1739 | parent: fs_info->space_info_kobj, fmt: "%s" , |
1740 | alloc_name(flags: space_info->flags)); |
1741 | if (ret) { |
1742 | kobject_put(kobj: &space_info->kobj); |
1743 | return ret; |
1744 | } |
1745 | |
1746 | return 0; |
1747 | } |
1748 | |
1749 | void btrfs_sysfs_remove_device(struct btrfs_device *device) |
1750 | { |
1751 | struct kobject *devices_kobj; |
1752 | |
1753 | /* |
1754 | * Seed fs_devices devices_kobj aren't used, fetch kobject from the |
1755 | * fs_info::fs_devices. |
1756 | */ |
1757 | devices_kobj = device->fs_info->fs_devices->devices_kobj; |
1758 | ASSERT(devices_kobj); |
1759 | |
1760 | if (device->bdev) |
1761 | sysfs_remove_link(kobj: devices_kobj, bdev_kobj(device->bdev)->name); |
1762 | |
1763 | if (device->devid_kobj.state_initialized) { |
1764 | kobject_del(kobj: &device->devid_kobj); |
1765 | kobject_put(kobj: &device->devid_kobj); |
1766 | wait_for_completion(&device->kobj_unregister); |
1767 | } |
1768 | } |
1769 | |
1770 | static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, |
1771 | struct kobj_attribute *a, |
1772 | char *buf) |
1773 | { |
1774 | int val; |
1775 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1776 | devid_kobj); |
1777 | |
1778 | val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); |
1779 | |
1780 | return sysfs_emit(buf, fmt: "%d\n" , val); |
1781 | } |
1782 | BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); |
1783 | |
1784 | static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, |
1785 | struct kobj_attribute *a, char *buf) |
1786 | { |
1787 | int val; |
1788 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1789 | devid_kobj); |
1790 | |
1791 | val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); |
1792 | |
1793 | return sysfs_emit(buf, fmt: "%d\n" , val); |
1794 | } |
1795 | BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); |
1796 | |
1797 | static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, |
1798 | struct kobj_attribute *a, |
1799 | char *buf) |
1800 | { |
1801 | int val; |
1802 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1803 | devid_kobj); |
1804 | |
1805 | val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); |
1806 | |
1807 | return sysfs_emit(buf, fmt: "%d\n" , val); |
1808 | } |
1809 | BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); |
1810 | |
1811 | static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, |
1812 | struct kobj_attribute *a, |
1813 | char *buf) |
1814 | { |
1815 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1816 | devid_kobj); |
1817 | |
1818 | return sysfs_emit(buf, fmt: "%llu\n" , READ_ONCE(device->scrub_speed_max)); |
1819 | } |
1820 | |
1821 | static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, |
1822 | struct kobj_attribute *a, |
1823 | const char *buf, size_t len) |
1824 | { |
1825 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1826 | devid_kobj); |
1827 | char *endptr; |
1828 | unsigned long long limit; |
1829 | |
1830 | limit = memparse(ptr: buf, retptr: &endptr); |
1831 | /* There could be trailing '\n', also catch any typos after the value. */ |
1832 | endptr = skip_spaces(endptr); |
1833 | if (*endptr != 0) |
1834 | return -EINVAL; |
1835 | WRITE_ONCE(device->scrub_speed_max, limit); |
1836 | return len; |
1837 | } |
1838 | BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, |
1839 | btrfs_devinfo_scrub_speed_max_store); |
1840 | |
1841 | static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, |
1842 | struct kobj_attribute *a, char *buf) |
1843 | { |
1844 | int val; |
1845 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1846 | devid_kobj); |
1847 | |
1848 | val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); |
1849 | |
1850 | return sysfs_emit(buf, fmt: "%d\n" , val); |
1851 | } |
1852 | BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); |
1853 | |
1854 | static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj, |
1855 | struct kobj_attribute *a, char *buf) |
1856 | { |
1857 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1858 | devid_kobj); |
1859 | |
1860 | return sysfs_emit(buf, fmt: "%pU\n" , device->fs_devices->fsid); |
1861 | } |
1862 | BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show); |
1863 | |
1864 | static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, |
1865 | struct kobj_attribute *a, char *buf) |
1866 | { |
1867 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1868 | devid_kobj); |
1869 | |
1870 | if (!device->dev_stats_valid) |
1871 | return sysfs_emit(buf, fmt: "invalid\n" ); |
1872 | |
1873 | /* |
1874 | * Print all at once so we get a snapshot of all values from the same |
1875 | * time. Keep them in sync and in order of definition of |
1876 | * btrfs_dev_stat_values. |
1877 | */ |
1878 | return sysfs_emit(buf, |
1879 | fmt: "write_errs %d\n" |
1880 | "read_errs %d\n" |
1881 | "flush_errs %d\n" |
1882 | "corruption_errs %d\n" |
1883 | "generation_errs %d\n" , |
1884 | btrfs_dev_stat_read(dev: device, index: BTRFS_DEV_STAT_WRITE_ERRS), |
1885 | btrfs_dev_stat_read(dev: device, index: BTRFS_DEV_STAT_READ_ERRS), |
1886 | btrfs_dev_stat_read(dev: device, index: BTRFS_DEV_STAT_FLUSH_ERRS), |
1887 | btrfs_dev_stat_read(dev: device, index: BTRFS_DEV_STAT_CORRUPTION_ERRS), |
1888 | btrfs_dev_stat_read(dev: device, index: BTRFS_DEV_STAT_GENERATION_ERRS)); |
1889 | } |
1890 | BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); |
1891 | |
1892 | /* |
1893 | * Information about one device. |
1894 | * |
1895 | * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/ |
1896 | */ |
1897 | static struct attribute *devid_attrs[] = { |
1898 | BTRFS_ATTR_PTR(devid, error_stats), |
1899 | BTRFS_ATTR_PTR(devid, fsid), |
1900 | BTRFS_ATTR_PTR(devid, in_fs_metadata), |
1901 | BTRFS_ATTR_PTR(devid, missing), |
1902 | BTRFS_ATTR_PTR(devid, replace_target), |
1903 | BTRFS_ATTR_PTR(devid, scrub_speed_max), |
1904 | BTRFS_ATTR_PTR(devid, writeable), |
1905 | NULL |
1906 | }; |
1907 | ATTRIBUTE_GROUPS(devid); |
1908 | |
1909 | static void btrfs_release_devid_kobj(struct kobject *kobj) |
1910 | { |
1911 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, |
1912 | devid_kobj); |
1913 | |
1914 | memset(&device->devid_kobj, 0, sizeof(struct kobject)); |
1915 | complete(&device->kobj_unregister); |
1916 | } |
1917 | |
1918 | static const struct kobj_type devid_ktype = { |
1919 | .sysfs_ops = &kobj_sysfs_ops, |
1920 | .default_groups = devid_groups, |
1921 | .release = btrfs_release_devid_kobj, |
1922 | }; |
1923 | |
1924 | int btrfs_sysfs_add_device(struct btrfs_device *device) |
1925 | { |
1926 | int ret; |
1927 | unsigned int nofs_flag; |
1928 | struct kobject *devices_kobj; |
1929 | struct kobject *devinfo_kobj; |
1930 | |
1931 | /* |
1932 | * Make sure we use the fs_info::fs_devices to fetch the kobjects even |
1933 | * for the seed fs_devices |
1934 | */ |
1935 | devices_kobj = device->fs_info->fs_devices->devices_kobj; |
1936 | devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; |
1937 | ASSERT(devices_kobj); |
1938 | ASSERT(devinfo_kobj); |
1939 | |
1940 | nofs_flag = memalloc_nofs_save(); |
1941 | |
1942 | if (device->bdev) { |
1943 | struct kobject *disk_kobj = bdev_kobj(device->bdev); |
1944 | |
1945 | ret = sysfs_create_link(kobj: devices_kobj, target: disk_kobj, name: disk_kobj->name); |
1946 | if (ret) { |
1947 | btrfs_warn(device->fs_info, |
1948 | "creating sysfs device link for devid %llu failed: %d" , |
1949 | device->devid, ret); |
1950 | goto out; |
1951 | } |
1952 | } |
1953 | |
1954 | init_completion(x: &device->kobj_unregister); |
1955 | ret = kobject_init_and_add(kobj: &device->devid_kobj, ktype: &devid_ktype, |
1956 | parent: devinfo_kobj, fmt: "%llu" , device->devid); |
1957 | if (ret) { |
1958 | kobject_put(kobj: &device->devid_kobj); |
1959 | btrfs_warn(device->fs_info, |
1960 | "devinfo init for devid %llu failed: %d" , |
1961 | device->devid, ret); |
1962 | } |
1963 | |
1964 | out: |
1965 | memalloc_nofs_restore(flags: nofs_flag); |
1966 | return ret; |
1967 | } |
1968 | |
1969 | static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) |
1970 | { |
1971 | int ret; |
1972 | struct btrfs_device *device; |
1973 | struct btrfs_fs_devices *seed; |
1974 | |
1975 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
1976 | ret = btrfs_sysfs_add_device(device); |
1977 | if (ret) |
1978 | goto fail; |
1979 | } |
1980 | |
1981 | list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { |
1982 | list_for_each_entry(device, &seed->devices, dev_list) { |
1983 | ret = btrfs_sysfs_add_device(device); |
1984 | if (ret) |
1985 | goto fail; |
1986 | } |
1987 | } |
1988 | |
1989 | return 0; |
1990 | |
1991 | fail: |
1992 | btrfs_sysfs_remove_fs_devices(fs_devices); |
1993 | return ret; |
1994 | } |
1995 | |
1996 | void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) |
1997 | { |
1998 | int ret; |
1999 | |
2000 | ret = kobject_uevent(kobj: &disk_to_dev(bdev->bd_disk)->kobj, action); |
2001 | if (ret) |
2002 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n" , |
2003 | action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), |
2004 | &disk_to_dev(bdev->bd_disk)->kobj); |
2005 | } |
2006 | |
2007 | void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) |
2008 | |
2009 | { |
2010 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; |
2011 | |
2012 | /* |
2013 | * Sprouting changes fsid of the mounted filesystem, rename the fsid |
2014 | * directory |
2015 | */ |
2016 | snprintf(buf: fsid_buf, BTRFS_UUID_UNPARSED_SIZE, fmt: "%pU" , fs_devices->fsid); |
2017 | if (kobject_rename(&fs_devices->fsid_kobj, new_name: fsid_buf)) |
2018 | btrfs_warn(fs_devices->fs_info, |
2019 | "sysfs: failed to create fsid for sprout" ); |
2020 | } |
2021 | |
2022 | void btrfs_sysfs_update_devid(struct btrfs_device *device) |
2023 | { |
2024 | char tmp[24]; |
2025 | |
2026 | snprintf(buf: tmp, size: sizeof(tmp), fmt: "%llu" , device->devid); |
2027 | |
2028 | if (kobject_rename(&device->devid_kobj, new_name: tmp)) |
2029 | btrfs_warn(device->fs_devices->fs_info, |
2030 | "sysfs: failed to update devid for %llu" , |
2031 | device->devid); |
2032 | } |
2033 | |
2034 | /* /sys/fs/btrfs/ entry */ |
2035 | static struct kset *btrfs_kset; |
2036 | |
2037 | /* |
2038 | * Creates: |
2039 | * /sys/fs/btrfs/UUID |
2040 | * |
2041 | * Can be called by the device discovery thread. |
2042 | */ |
2043 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) |
2044 | { |
2045 | int error; |
2046 | |
2047 | init_completion(x: &fs_devs->kobj_unregister); |
2048 | fs_devs->fsid_kobj.kset = btrfs_kset; |
2049 | error = kobject_init_and_add(kobj: &fs_devs->fsid_kobj, ktype: &btrfs_ktype, NULL, |
2050 | fmt: "%pU" , fs_devs->fsid); |
2051 | if (error) { |
2052 | kobject_put(kobj: &fs_devs->fsid_kobj); |
2053 | return error; |
2054 | } |
2055 | |
2056 | fs_devs->devices_kobj = kobject_create_and_add(name: "devices" , |
2057 | parent: &fs_devs->fsid_kobj); |
2058 | if (!fs_devs->devices_kobj) { |
2059 | btrfs_err(fs_devs->fs_info, |
2060 | "failed to init sysfs device interface" ); |
2061 | btrfs_sysfs_remove_fsid(fs_devs); |
2062 | return -ENOMEM; |
2063 | } |
2064 | |
2065 | fs_devs->devinfo_kobj = kobject_create_and_add(name: "devinfo" , |
2066 | parent: &fs_devs->fsid_kobj); |
2067 | if (!fs_devs->devinfo_kobj) { |
2068 | btrfs_err(fs_devs->fs_info, |
2069 | "failed to init sysfs devinfo kobject" ); |
2070 | btrfs_sysfs_remove_fsid(fs_devs); |
2071 | return -ENOMEM; |
2072 | } |
2073 | |
2074 | return 0; |
2075 | } |
2076 | |
2077 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
2078 | { |
2079 | int error; |
2080 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
2081 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
2082 | |
2083 | error = btrfs_sysfs_add_fs_devices(fs_devices: fs_devs); |
2084 | if (error) |
2085 | return error; |
2086 | |
2087 | error = sysfs_create_files(kobj: fsid_kobj, attr: btrfs_attrs); |
2088 | if (error) { |
2089 | btrfs_sysfs_remove_fs_devices(fs_devices: fs_devs); |
2090 | return error; |
2091 | } |
2092 | |
2093 | error = sysfs_create_group(kobj: fsid_kobj, |
2094 | grp: &btrfs_feature_attr_group); |
2095 | if (error) |
2096 | goto failure; |
2097 | |
2098 | #ifdef CONFIG_BTRFS_DEBUG |
2099 | fs_info->debug_kobj = kobject_create_and_add(name: "debug" , parent: fsid_kobj); |
2100 | if (!fs_info->debug_kobj) { |
2101 | error = -ENOMEM; |
2102 | goto failure; |
2103 | } |
2104 | |
2105 | error = sysfs_create_files(kobj: fs_info->debug_kobj, attr: btrfs_debug_mount_attrs); |
2106 | if (error) |
2107 | goto failure; |
2108 | #endif |
2109 | |
2110 | /* Discard directory */ |
2111 | fs_info->discard_kobj = kobject_create_and_add(name: "discard" , parent: fsid_kobj); |
2112 | if (!fs_info->discard_kobj) { |
2113 | error = -ENOMEM; |
2114 | goto failure; |
2115 | } |
2116 | |
2117 | error = sysfs_create_files(kobj: fs_info->discard_kobj, attr: discard_attrs); |
2118 | if (error) |
2119 | goto failure; |
2120 | |
2121 | error = addrm_unknown_feature_attrs(fs_info, add: true); |
2122 | if (error) |
2123 | goto failure; |
2124 | |
2125 | error = sysfs_create_link(kobj: fsid_kobj, target: &fs_info->sb->s_bdi->dev->kobj, name: "bdi" ); |
2126 | if (error) |
2127 | goto failure; |
2128 | |
2129 | fs_info->space_info_kobj = kobject_create_and_add(name: "allocation" , |
2130 | parent: fsid_kobj); |
2131 | if (!fs_info->space_info_kobj) { |
2132 | error = -ENOMEM; |
2133 | goto failure; |
2134 | } |
2135 | |
2136 | error = sysfs_create_files(kobj: fs_info->space_info_kobj, attr: allocation_attrs); |
2137 | if (error) |
2138 | goto failure; |
2139 | |
2140 | return 0; |
2141 | failure: |
2142 | btrfs_sysfs_remove_mounted(fs_info); |
2143 | return error; |
2144 | } |
2145 | |
2146 | static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj, |
2147 | struct kobj_attribute *a, |
2148 | char *buf) |
2149 | { |
2150 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: qgroups_kobj->parent); |
2151 | bool enabled; |
2152 | |
2153 | spin_lock(lock: &fs_info->qgroup_lock); |
2154 | enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON; |
2155 | spin_unlock(lock: &fs_info->qgroup_lock); |
2156 | |
2157 | return sysfs_emit(buf, fmt: "%d\n" , enabled); |
2158 | } |
2159 | BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show); |
2160 | |
2161 | static ssize_t qgroup_mode_show(struct kobject *qgroups_kobj, |
2162 | struct kobj_attribute *a, |
2163 | char *buf) |
2164 | { |
2165 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: qgroups_kobj->parent); |
2166 | ssize_t ret = 0; |
2167 | |
2168 | spin_lock(lock: &fs_info->qgroup_lock); |
2169 | ASSERT(btrfs_qgroup_enabled(fs_info)); |
2170 | switch (btrfs_qgroup_mode(fs_info)) { |
2171 | case BTRFS_QGROUP_MODE_FULL: |
2172 | ret = sysfs_emit(buf, fmt: "qgroup\n" ); |
2173 | break; |
2174 | case BTRFS_QGROUP_MODE_SIMPLE: |
2175 | ret = sysfs_emit(buf, fmt: "squota\n" ); |
2176 | break; |
2177 | default: |
2178 | btrfs_warn(fs_info, "unexpected qgroup mode %d\n" , |
2179 | btrfs_qgroup_mode(fs_info)); |
2180 | break; |
2181 | } |
2182 | spin_unlock(lock: &fs_info->qgroup_lock); |
2183 | |
2184 | return ret; |
2185 | } |
2186 | BTRFS_ATTR(qgroups, mode, qgroup_mode_show); |
2187 | |
2188 | static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, |
2189 | struct kobj_attribute *a, |
2190 | char *buf) |
2191 | { |
2192 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: qgroups_kobj->parent); |
2193 | bool inconsistent; |
2194 | |
2195 | spin_lock(lock: &fs_info->qgroup_lock); |
2196 | inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT); |
2197 | spin_unlock(lock: &fs_info->qgroup_lock); |
2198 | |
2199 | return sysfs_emit(buf, fmt: "%d\n" , inconsistent); |
2200 | } |
2201 | BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); |
2202 | |
2203 | static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, |
2204 | struct kobj_attribute *a, |
2205 | char *buf) |
2206 | { |
2207 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: qgroups_kobj->parent); |
2208 | u8 result; |
2209 | |
2210 | spin_lock(lock: &fs_info->qgroup_lock); |
2211 | result = fs_info->qgroup_drop_subtree_thres; |
2212 | spin_unlock(lock: &fs_info->qgroup_lock); |
2213 | |
2214 | return sysfs_emit(buf, fmt: "%d\n" , result); |
2215 | } |
2216 | |
2217 | static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, |
2218 | struct kobj_attribute *a, |
2219 | const char *buf, size_t len) |
2220 | { |
2221 | struct btrfs_fs_info *fs_info = to_fs_info(kobj: qgroups_kobj->parent); |
2222 | u8 new_thres; |
2223 | int ret; |
2224 | |
2225 | ret = kstrtou8(s: buf, base: 10, res: &new_thres); |
2226 | if (ret) |
2227 | return -EINVAL; |
2228 | |
2229 | if (new_thres > BTRFS_MAX_LEVEL) |
2230 | return -EINVAL; |
2231 | |
2232 | spin_lock(lock: &fs_info->qgroup_lock); |
2233 | fs_info->qgroup_drop_subtree_thres = new_thres; |
2234 | spin_unlock(lock: &fs_info->qgroup_lock); |
2235 | |
2236 | return len; |
2237 | } |
2238 | BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, |
2239 | qgroup_drop_subtree_thres_store); |
2240 | |
2241 | /* |
2242 | * Qgroups global info |
2243 | * |
2244 | * Path: /sys/fs/btrfs/<uuid>/qgroups/ |
2245 | */ |
2246 | static struct attribute *qgroups_attrs[] = { |
2247 | BTRFS_ATTR_PTR(qgroups, enabled), |
2248 | BTRFS_ATTR_PTR(qgroups, inconsistent), |
2249 | BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), |
2250 | BTRFS_ATTR_PTR(qgroups, mode), |
2251 | NULL |
2252 | }; |
2253 | ATTRIBUTE_GROUPS(qgroups); |
2254 | |
2255 | static void qgroups_release(struct kobject *kobj) |
2256 | { |
2257 | kfree(objp: kobj); |
2258 | } |
2259 | |
2260 | static const struct kobj_type qgroups_ktype = { |
2261 | .sysfs_ops = &kobj_sysfs_ops, |
2262 | .default_groups = qgroups_groups, |
2263 | .release = qgroups_release, |
2264 | }; |
2265 | |
2266 | static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) |
2267 | { |
2268 | return to_fs_info(kobj: kobj->parent->parent); |
2269 | } |
2270 | |
2271 | #define QGROUP_ATTR(_member, _show_name) \ |
2272 | static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ |
2273 | struct kobj_attribute *a, \ |
2274 | char *buf) \ |
2275 | { \ |
2276 | struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ |
2277 | struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ |
2278 | struct btrfs_qgroup, kobj); \ |
2279 | return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ |
2280 | } \ |
2281 | BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) |
2282 | |
2283 | #define QGROUP_RSV_ATTR(_name, _type) \ |
2284 | static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ |
2285 | struct kobj_attribute *a, \ |
2286 | char *buf) \ |
2287 | { \ |
2288 | struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ |
2289 | struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ |
2290 | struct btrfs_qgroup, kobj); \ |
2291 | return btrfs_show_u64(&qgroup->rsv.values[_type], \ |
2292 | &fs_info->qgroup_lock, buf); \ |
2293 | } \ |
2294 | BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) |
2295 | |
2296 | QGROUP_ATTR(rfer, referenced); |
2297 | QGROUP_ATTR(excl, exclusive); |
2298 | QGROUP_ATTR(max_rfer, max_referenced); |
2299 | QGROUP_ATTR(max_excl, max_exclusive); |
2300 | QGROUP_ATTR(lim_flags, limit_flags); |
2301 | QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); |
2302 | QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); |
2303 | QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); |
2304 | |
2305 | /* |
2306 | * Qgroup information. |
2307 | * |
2308 | * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/ |
2309 | */ |
2310 | static struct attribute *qgroup_attrs[] = { |
2311 | BTRFS_ATTR_PTR(qgroup, referenced), |
2312 | BTRFS_ATTR_PTR(qgroup, exclusive), |
2313 | BTRFS_ATTR_PTR(qgroup, max_referenced), |
2314 | BTRFS_ATTR_PTR(qgroup, max_exclusive), |
2315 | BTRFS_ATTR_PTR(qgroup, limit_flags), |
2316 | BTRFS_ATTR_PTR(qgroup, rsv_data), |
2317 | BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), |
2318 | BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), |
2319 | NULL |
2320 | }; |
2321 | ATTRIBUTE_GROUPS(qgroup); |
2322 | |
2323 | static void qgroup_release(struct kobject *kobj) |
2324 | { |
2325 | struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); |
2326 | |
2327 | memset(&qgroup->kobj, 0, sizeof(*kobj)); |
2328 | } |
2329 | |
2330 | static const struct kobj_type qgroup_ktype = { |
2331 | .sysfs_ops = &kobj_sysfs_ops, |
2332 | .release = qgroup_release, |
2333 | .default_groups = qgroup_groups, |
2334 | }; |
2335 | |
2336 | int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, |
2337 | struct btrfs_qgroup *qgroup) |
2338 | { |
2339 | struct kobject *qgroups_kobj = fs_info->qgroups_kobj; |
2340 | int ret; |
2341 | |
2342 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) |
2343 | return 0; |
2344 | if (qgroup->kobj.state_initialized) |
2345 | return 0; |
2346 | if (!qgroups_kobj) |
2347 | return -EINVAL; |
2348 | |
2349 | ret = kobject_init_and_add(kobj: &qgroup->kobj, ktype: &qgroup_ktype, parent: qgroups_kobj, |
2350 | fmt: "%hu_%llu" , btrfs_qgroup_level(qgroupid: qgroup->qgroupid), |
2351 | btrfs_qgroup_subvolid(qgroupid: qgroup->qgroupid)); |
2352 | if (ret < 0) |
2353 | kobject_put(kobj: &qgroup->kobj); |
2354 | |
2355 | return ret; |
2356 | } |
2357 | |
2358 | void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) |
2359 | { |
2360 | struct btrfs_qgroup *qgroup; |
2361 | struct btrfs_qgroup *next; |
2362 | |
2363 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) |
2364 | return; |
2365 | |
2366 | rbtree_postorder_for_each_entry_safe(qgroup, next, |
2367 | &fs_info->qgroup_tree, node) |
2368 | btrfs_sysfs_del_one_qgroup(fs_info, qgroup); |
2369 | if (fs_info->qgroups_kobj) { |
2370 | kobject_del(kobj: fs_info->qgroups_kobj); |
2371 | kobject_put(kobj: fs_info->qgroups_kobj); |
2372 | fs_info->qgroups_kobj = NULL; |
2373 | } |
2374 | } |
2375 | |
2376 | /* Called when qgroups get initialized, thus there is no need for locking */ |
2377 | int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) |
2378 | { |
2379 | struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; |
2380 | struct btrfs_qgroup *qgroup; |
2381 | struct btrfs_qgroup *next; |
2382 | int ret = 0; |
2383 | |
2384 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) |
2385 | return 0; |
2386 | |
2387 | ASSERT(fsid_kobj); |
2388 | if (fs_info->qgroups_kobj) |
2389 | return 0; |
2390 | |
2391 | fs_info->qgroups_kobj = kzalloc(size: sizeof(struct kobject), GFP_KERNEL); |
2392 | if (!fs_info->qgroups_kobj) |
2393 | return -ENOMEM; |
2394 | |
2395 | ret = kobject_init_and_add(kobj: fs_info->qgroups_kobj, ktype: &qgroups_ktype, |
2396 | parent: fsid_kobj, fmt: "qgroups" ); |
2397 | if (ret < 0) |
2398 | goto out; |
2399 | |
2400 | rbtree_postorder_for_each_entry_safe(qgroup, next, |
2401 | &fs_info->qgroup_tree, node) { |
2402 | ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); |
2403 | if (ret < 0) |
2404 | goto out; |
2405 | } |
2406 | |
2407 | out: |
2408 | if (ret < 0) |
2409 | btrfs_sysfs_del_qgroups(fs_info); |
2410 | return ret; |
2411 | } |
2412 | |
2413 | void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, |
2414 | struct btrfs_qgroup *qgroup) |
2415 | { |
2416 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) |
2417 | return; |
2418 | |
2419 | if (qgroup->kobj.state_initialized) { |
2420 | kobject_del(kobj: &qgroup->kobj); |
2421 | kobject_put(kobj: &qgroup->kobj); |
2422 | } |
2423 | } |
2424 | |
2425 | /* |
2426 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current |
2427 | * values in superblock. Call after any changes to incompat/compat_ro flags |
2428 | */ |
2429 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info) |
2430 | { |
2431 | struct kobject *fsid_kobj; |
2432 | int ret; |
2433 | |
2434 | if (!fs_info) |
2435 | return; |
2436 | |
2437 | fsid_kobj = &fs_info->fs_devices->fsid_kobj; |
2438 | if (!fsid_kobj->state_initialized) |
2439 | return; |
2440 | |
2441 | ret = sysfs_update_group(kobj: fsid_kobj, grp: &btrfs_feature_attr_group); |
2442 | if (ret < 0) |
2443 | btrfs_warn(fs_info, |
2444 | "failed to update /sys/fs/btrfs/%pU/features: %d" , |
2445 | fs_info->fs_devices->fsid, ret); |
2446 | } |
2447 | |
2448 | int __init btrfs_init_sysfs(void) |
2449 | { |
2450 | int ret; |
2451 | |
2452 | btrfs_kset = kset_create_and_add(name: "btrfs" , NULL, parent_kobj: fs_kobj); |
2453 | if (!btrfs_kset) |
2454 | return -ENOMEM; |
2455 | |
2456 | init_feature_attrs(); |
2457 | ret = sysfs_create_group(kobj: &btrfs_kset->kobj, grp: &btrfs_feature_attr_group); |
2458 | if (ret) |
2459 | goto out2; |
2460 | ret = sysfs_merge_group(kobj: &btrfs_kset->kobj, |
2461 | grp: &btrfs_static_feature_attr_group); |
2462 | if (ret) |
2463 | goto out_remove_group; |
2464 | |
2465 | #ifdef CONFIG_BTRFS_DEBUG |
2466 | ret = sysfs_create_group(kobj: &btrfs_kset->kobj, grp: &btrfs_debug_feature_attr_group); |
2467 | if (ret) { |
2468 | sysfs_unmerge_group(kobj: &btrfs_kset->kobj, |
2469 | grp: &btrfs_static_feature_attr_group); |
2470 | goto out_remove_group; |
2471 | } |
2472 | #endif |
2473 | |
2474 | return 0; |
2475 | |
2476 | out_remove_group: |
2477 | sysfs_remove_group(kobj: &btrfs_kset->kobj, grp: &btrfs_feature_attr_group); |
2478 | out2: |
2479 | kset_unregister(kset: btrfs_kset); |
2480 | |
2481 | return ret; |
2482 | } |
2483 | |
2484 | void __cold btrfs_exit_sysfs(void) |
2485 | { |
2486 | sysfs_unmerge_group(kobj: &btrfs_kset->kobj, |
2487 | grp: &btrfs_static_feature_attr_group); |
2488 | sysfs_remove_group(kobj: &btrfs_kset->kobj, grp: &btrfs_feature_attr_group); |
2489 | #ifdef CONFIG_BTRFS_DEBUG |
2490 | sysfs_remove_group(kobj: &btrfs_kset->kobj, grp: &btrfs_debug_feature_attr_group); |
2491 | #endif |
2492 | kset_unregister(kset: btrfs_kset); |
2493 | } |
2494 | |