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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 CM |
4 | */ |
5 | ||
58176a96 | 6 | #include <linux/sched.h> |
32a9991f | 7 | #include <linux/sched/mm.h> |
58176a96 JB |
8 | #include <linux/slab.h> |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/completion.h> | |
79da4fa4 | 11 | #include <linux/bug.h> |
41e6d2a8 | 12 | #include <crypto/hash.h> |
58176a96 | 13 | |
bae45de0 | 14 | #include "ctree.h" |
dfb79ddb | 15 | #include "discard.h" |
bae45de0 CM |
16 | #include "disk-io.h" |
17 | #include "transaction.h" | |
079b72bc | 18 | #include "sysfs.h" |
29e5be24 | 19 | #include "volumes.h" |
8719aaae | 20 | #include "space-info.h" |
aac0023c | 21 | #include "block-group.h" |
49e5fb46 | 22 | #include "qgroup.h" |
079b72bc | 23 | |
9188db61 DS |
24 | struct btrfs_feature_attr { |
25 | struct kobj_attribute kobj_attr; | |
26 | enum btrfs_feature_set feature_set; | |
27 | u64 feature_bit; | |
28 | }; | |
29 | ||
30 | /* For raid type sysfs entries */ | |
31 | struct raid_kobject { | |
32 | u64 flags; | |
33 | struct kobject kobj; | |
34 | }; | |
35 | ||
36 | #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ | |
37 | { \ | |
38 | .attr = { .name = __stringify(_name), .mode = _mode }, \ | |
39 | .show = _show, \ | |
40 | .store = _store, \ | |
41 | } | |
42 | ||
43 | #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ | |
44 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
45 | __INIT_KOBJ_ATTR(_name, 0644, _show, _store) | |
46 | ||
47 | #define BTRFS_ATTR(_prefix, _name, _show) \ | |
48 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
49 | __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) | |
50 | ||
51 | #define BTRFS_ATTR_PTR(_prefix, _name) \ | |
52 | (&btrfs_attr_##_prefix##_##_name.attr) | |
53 | ||
54 | #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ | |
55 | static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ | |
56 | .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ | |
57 | btrfs_feature_attr_show, \ | |
58 | btrfs_feature_attr_store), \ | |
59 | .feature_set = _feature_set, \ | |
60 | .feature_bit = _feature_prefix ##_## _feature_bit, \ | |
61 | } | |
62 | #define BTRFS_FEAT_ATTR_PTR(_name) \ | |
63 | (&btrfs_attr_features_##_name.kobj_attr.attr) | |
64 | ||
65 | #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ | |
66 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) | |
67 | #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ | |
68 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) | |
69 | #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ | |
70 | BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) | |
71 | ||
510d7360 | 72 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
2e7910d6 | 73 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
5ac1d209 | 74 | |
8f52316c DS |
75 | static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) |
76 | { | |
77 | return container_of(a, struct btrfs_feature_attr, kobj_attr); | |
78 | } | |
79 | ||
80 | static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) | |
81 | { | |
82 | return container_of(attr, struct kobj_attribute, attr); | |
83 | } | |
84 | ||
85 | static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( | |
86 | struct attribute *attr) | |
87 | { | |
88 | return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); | |
89 | } | |
90 | ||
510d7360 JM |
91 | static u64 get_features(struct btrfs_fs_info *fs_info, |
92 | enum btrfs_feature_set set) | |
5ac1d209 | 93 | { |
510d7360 JM |
94 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
95 | if (set == FEAT_COMPAT) | |
96 | return btrfs_super_compat_flags(disk_super); | |
97 | else if (set == FEAT_COMPAT_RO) | |
98 | return btrfs_super_compat_ro_flags(disk_super); | |
99 | else | |
100 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
101 | } |
102 | ||
ba631941 JM |
103 | static void set_features(struct btrfs_fs_info *fs_info, |
104 | enum btrfs_feature_set set, u64 features) | |
105 | { | |
106 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
107 | if (set == FEAT_COMPAT) | |
108 | btrfs_set_super_compat_flags(disk_super, features); | |
109 | else if (set == FEAT_COMPAT_RO) | |
110 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
111 | else | |
112 | btrfs_set_super_incompat_flags(disk_super, features); | |
113 | } | |
114 | ||
115 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
116 | { | |
117 | int val = 0; | |
118 | u64 set, clear; | |
119 | switch (fa->feature_set) { | |
120 | case FEAT_COMPAT: | |
121 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
122 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
123 | break; | |
124 | case FEAT_COMPAT_RO: | |
125 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
126 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
127 | break; | |
128 | case FEAT_INCOMPAT: | |
129 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
130 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
131 | break; | |
132 | default: | |
62e85577 | 133 | pr_warn("btrfs: sysfs: unknown feature set %d\n", |
cc37bb04 DS |
134 | fa->feature_set); |
135 | return 0; | |
ba631941 JM |
136 | } |
137 | ||
138 | if (set & fa->feature_bit) | |
139 | val |= 1; | |
140 | if (clear & fa->feature_bit) | |
141 | val |= 2; | |
142 | ||
143 | return val; | |
144 | } | |
145 | ||
510d7360 JM |
146 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
147 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 148 | { |
510d7360 | 149 | int val = 0; |
5ac1d209 | 150 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 151 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 152 | if (fs_info) { |
510d7360 JM |
153 | u64 features = get_features(fs_info, fa->feature_set); |
154 | if (features & fa->feature_bit) | |
155 | val = 1; | |
ba631941 JM |
156 | } else |
157 | val = can_modify_feature(fa); | |
510d7360 | 158 | |
abdd9feb | 159 | return scnprintf(buf, PAGE_SIZE, "%d\n", val); |
5ac1d209 JM |
160 | } |
161 | ||
ba631941 JM |
162 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
163 | struct kobj_attribute *a, | |
164 | const char *buf, size_t count) | |
165 | { | |
166 | struct btrfs_fs_info *fs_info; | |
167 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
ba631941 JM |
168 | u64 features, set, clear; |
169 | unsigned long val; | |
170 | int ret; | |
171 | ||
172 | fs_info = to_fs_info(kobj); | |
173 | if (!fs_info) | |
174 | return -EPERM; | |
175 | ||
bc98a42c | 176 | if (sb_rdonly(fs_info->sb)) |
ee611138 DS |
177 | return -EROFS; |
178 | ||
ba631941 JM |
179 | ret = kstrtoul(skip_spaces(buf), 0, &val); |
180 | if (ret) | |
181 | return ret; | |
182 | ||
183 | if (fa->feature_set == FEAT_COMPAT) { | |
184 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
185 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
186 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
187 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
188 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
189 | } else { | |
190 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
191 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
192 | } | |
193 | ||
194 | features = get_features(fs_info, fa->feature_set); | |
195 | ||
196 | /* Nothing to do */ | |
197 | if ((val && (features & fa->feature_bit)) || | |
198 | (!val && !(features & fa->feature_bit))) | |
199 | return count; | |
200 | ||
201 | if ((val && !(set & fa->feature_bit)) || | |
202 | (!val && !(clear & fa->feature_bit))) { | |
203 | btrfs_info(fs_info, | |
204 | "%sabling feature %s on mounted fs is not supported.", | |
205 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
206 | return -EPERM; | |
207 | } | |
208 | ||
209 | btrfs_info(fs_info, "%s %s feature flag", | |
210 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
211 | ||
ba631941 JM |
212 | spin_lock(&fs_info->super_lock); |
213 | features = get_features(fs_info, fa->feature_set); | |
214 | if (val) | |
215 | features |= fa->feature_bit; | |
216 | else | |
217 | features &= ~fa->feature_bit; | |
218 | set_features(fs_info, fa->feature_set, features); | |
219 | spin_unlock(&fs_info->super_lock); | |
220 | ||
0eae2747 DS |
221 | /* |
222 | * We don't want to do full transaction commit from inside sysfs | |
223 | */ | |
224 | btrfs_set_pending(fs_info, COMMIT); | |
225 | wake_up_process(fs_info->transaction_kthread); | |
ba631941 JM |
226 | |
227 | return count; | |
228 | } | |
229 | ||
510d7360 JM |
230 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
231 | struct attribute *attr, int unused) | |
079b72bc | 232 | { |
510d7360 JM |
233 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
234 | umode_t mode = attr->mode; | |
235 | ||
236 | if (fs_info) { | |
237 | struct btrfs_feature_attr *fa; | |
238 | u64 features; | |
239 | ||
240 | fa = attr_to_btrfs_feature_attr(attr); | |
241 | features = get_features(fs_info, fa->feature_set); | |
242 | ||
ba631941 JM |
243 | if (can_modify_feature(fa)) |
244 | mode |= S_IWUSR; | |
245 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
246 | mode = 0; |
247 | } | |
248 | ||
249 | return mode; | |
079b72bc JM |
250 | } |
251 | ||
252 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
253 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
254 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
255 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
5c1aab1d | 256 | BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); |
079b72bc JM |
257 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
258 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
259 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
260 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 261 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
56f20f40 | 262 | BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); |
3b5bb73b | 263 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
cfbb825c | 264 | BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); |
079b72bc JM |
265 | |
266 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
267 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
268 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
269 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
270 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
5c1aab1d | 271 | BTRFS_FEAT_ATTR_PTR(compress_zstd), |
079b72bc JM |
272 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
273 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
274 | BTRFS_FEAT_ATTR_PTR(raid56), | |
275 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 276 | BTRFS_FEAT_ATTR_PTR(no_holes), |
56f20f40 | 277 | BTRFS_FEAT_ATTR_PTR(metadata_uuid), |
3b5bb73b | 278 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
cfbb825c | 279 | BTRFS_FEAT_ATTR_PTR(raid1c34), |
079b72bc JM |
280 | NULL |
281 | }; | |
282 | ||
f902bd3a MT |
283 | /* |
284 | * Features which depend on feature bits and may differ between each fs. | |
285 | * | |
286 | * /sys/fs/btrfs/features lists all available features of this kernel while | |
287 | * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or | |
288 | * can be changed online. | |
289 | */ | |
079b72bc JM |
290 | static const struct attribute_group btrfs_feature_attr_group = { |
291 | .name = "features", | |
510d7360 | 292 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
293 | .attrs = btrfs_supported_feature_attrs, |
294 | }; | |
58176a96 | 295 | |
f902bd3a MT |
296 | static ssize_t rmdir_subvol_show(struct kobject *kobj, |
297 | struct kobj_attribute *ka, char *buf) | |
298 | { | |
abdd9feb | 299 | return scnprintf(buf, PAGE_SIZE, "0\n"); |
f902bd3a MT |
300 | } |
301 | BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); | |
302 | ||
f7cea56c DS |
303 | static ssize_t supported_checksums_show(struct kobject *kobj, |
304 | struct kobj_attribute *a, char *buf) | |
305 | { | |
306 | ssize_t ret = 0; | |
307 | int i; | |
308 | ||
309 | for (i = 0; i < btrfs_get_num_csums(); i++) { | |
310 | /* | |
311 | * This "trick" only works as long as 'enum btrfs_csum_type' has | |
312 | * no holes in it | |
313 | */ | |
abdd9feb | 314 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%s", |
f7cea56c DS |
315 | (i == 0 ? "" : " "), btrfs_super_csum_name(i)); |
316 | ||
317 | } | |
318 | ||
abdd9feb | 319 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n"); |
f7cea56c DS |
320 | return ret; |
321 | } | |
322 | BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); | |
323 | ||
f902bd3a MT |
324 | static struct attribute *btrfs_supported_static_feature_attrs[] = { |
325 | BTRFS_ATTR_PTR(static_feature, rmdir_subvol), | |
f7cea56c | 326 | BTRFS_ATTR_PTR(static_feature, supported_checksums), |
f902bd3a MT |
327 | NULL |
328 | }; | |
329 | ||
330 | /* | |
331 | * Features which only depend on kernel version. | |
332 | * | |
333 | * These are listed in /sys/fs/btrfs/features along with | |
334 | * btrfs_feature_attr_group | |
335 | */ | |
336 | static const struct attribute_group btrfs_static_feature_attr_group = { | |
337 | .name = "features", | |
338 | .attrs = btrfs_supported_static_feature_attrs, | |
339 | }; | |
340 | ||
6e369feb DS |
341 | #ifdef CONFIG_BTRFS_DEBUG |
342 | ||
e4faab84 DZ |
343 | /* |
344 | * Discard statistics and tunables | |
345 | */ | |
dfb79ddb DZ |
346 | #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent) |
347 | ||
5dc7c10b DZ |
348 | static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, |
349 | struct kobj_attribute *a, | |
350 | char *buf) | |
351 | { | |
352 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
353 | ||
abdd9feb | 354 | return scnprintf(buf, PAGE_SIZE, "%lld\n", |
5dc7c10b DZ |
355 | atomic64_read(&fs_info->discard_ctl.discardable_bytes)); |
356 | } | |
357 | BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); | |
358 | ||
dfb79ddb DZ |
359 | static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, |
360 | struct kobj_attribute *a, | |
361 | char *buf) | |
362 | { | |
363 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
364 | ||
abdd9feb | 365 | return scnprintf(buf, PAGE_SIZE, "%d\n", |
dfb79ddb DZ |
366 | atomic_read(&fs_info->discard_ctl.discardable_extents)); |
367 | } | |
368 | BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); | |
369 | ||
9ddf648f DZ |
370 | static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, |
371 | struct kobj_attribute *a, | |
372 | char *buf) | |
373 | { | |
374 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
375 | ||
abdd9feb | 376 | return scnprintf(buf, PAGE_SIZE, "%lld\n", |
9ddf648f DZ |
377 | fs_info->discard_ctl.discard_bitmap_bytes); |
378 | } | |
379 | BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); | |
380 | ||
381 | static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, | |
382 | struct kobj_attribute *a, | |
383 | char *buf) | |
384 | { | |
385 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
386 | ||
abdd9feb | 387 | return scnprintf(buf, PAGE_SIZE, "%lld\n", |
9ddf648f DZ |
388 | atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); |
389 | } | |
390 | BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); | |
391 | ||
392 | static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, | |
393 | struct kobj_attribute *a, | |
394 | char *buf) | |
395 | { | |
396 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
397 | ||
abdd9feb | 398 | return scnprintf(buf, PAGE_SIZE, "%lld\n", |
9ddf648f DZ |
399 | fs_info->discard_ctl.discard_extent_bytes); |
400 | } | |
401 | BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); | |
402 | ||
a2309300 DZ |
403 | static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, |
404 | struct kobj_attribute *a, | |
405 | char *buf) | |
406 | { | |
407 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
408 | ||
abdd9feb | 409 | return scnprintf(buf, PAGE_SIZE, "%u\n", |
a2309300 DZ |
410 | READ_ONCE(fs_info->discard_ctl.iops_limit)); |
411 | } | |
412 | ||
413 | static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, | |
414 | struct kobj_attribute *a, | |
415 | const char *buf, size_t len) | |
416 | { | |
417 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
418 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; | |
419 | u32 iops_limit; | |
420 | int ret; | |
421 | ||
422 | ret = kstrtou32(buf, 10, &iops_limit); | |
423 | if (ret) | |
424 | return -EINVAL; | |
425 | ||
426 | WRITE_ONCE(discard_ctl->iops_limit, iops_limit); | |
427 | ||
428 | return len; | |
429 | } | |
430 | BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, | |
431 | btrfs_discard_iops_limit_store); | |
432 | ||
e93591bb DZ |
433 | static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, |
434 | struct kobj_attribute *a, | |
435 | char *buf) | |
436 | { | |
437 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
438 | ||
abdd9feb | 439 | return scnprintf(buf, PAGE_SIZE, "%u\n", |
e93591bb DZ |
440 | READ_ONCE(fs_info->discard_ctl.kbps_limit)); |
441 | } | |
442 | ||
443 | static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, | |
444 | struct kobj_attribute *a, | |
445 | const char *buf, size_t len) | |
446 | { | |
447 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
448 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; | |
449 | u32 kbps_limit; | |
450 | int ret; | |
451 | ||
452 | ret = kstrtou32(buf, 10, &kbps_limit); | |
453 | if (ret) | |
454 | return -EINVAL; | |
455 | ||
456 | WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); | |
457 | ||
458 | return len; | |
459 | } | |
460 | BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, | |
461 | btrfs_discard_kbps_limit_store); | |
462 | ||
19b2a2c7 DZ |
463 | static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, |
464 | struct kobj_attribute *a, | |
465 | char *buf) | |
466 | { | |
467 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
468 | ||
abdd9feb | 469 | return scnprintf(buf, PAGE_SIZE, "%llu\n", |
19b2a2c7 DZ |
470 | READ_ONCE(fs_info->discard_ctl.max_discard_size)); |
471 | } | |
472 | ||
473 | static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, | |
474 | struct kobj_attribute *a, | |
475 | const char *buf, size_t len) | |
476 | { | |
477 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
478 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; | |
479 | u64 max_discard_size; | |
480 | int ret; | |
481 | ||
482 | ret = kstrtou64(buf, 10, &max_discard_size); | |
483 | if (ret) | |
484 | return -EINVAL; | |
485 | ||
486 | WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); | |
487 | ||
488 | return len; | |
489 | } | |
490 | BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, | |
491 | btrfs_discard_max_discard_size_store); | |
492 | ||
e4faab84 | 493 | static const struct attribute *discard_debug_attrs[] = { |
5dc7c10b | 494 | BTRFS_ATTR_PTR(discard, discardable_bytes), |
dfb79ddb | 495 | BTRFS_ATTR_PTR(discard, discardable_extents), |
9ddf648f DZ |
496 | BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), |
497 | BTRFS_ATTR_PTR(discard, discard_bytes_saved), | |
498 | BTRFS_ATTR_PTR(discard, discard_extent_bytes), | |
a2309300 | 499 | BTRFS_ATTR_PTR(discard, iops_limit), |
e93591bb | 500 | BTRFS_ATTR_PTR(discard, kbps_limit), |
19b2a2c7 | 501 | BTRFS_ATTR_PTR(discard, max_discard_size), |
e4faab84 DZ |
502 | NULL, |
503 | }; | |
504 | ||
6e369feb DS |
505 | /* |
506 | * Runtime debugging exported via sysfs | |
507 | * | |
508 | * /sys/fs/btrfs/debug - applies to module or all filesystems | |
509 | * /sys/fs/btrfs/UUID - applies only to the given filesystem | |
510 | */ | |
93945cb4 DZ |
511 | static const struct attribute *btrfs_debug_mount_attrs[] = { |
512 | NULL, | |
513 | }; | |
514 | ||
6e369feb DS |
515 | static struct attribute *btrfs_debug_feature_attrs[] = { |
516 | NULL | |
517 | }; | |
518 | ||
519 | static const struct attribute_group btrfs_debug_feature_attr_group = { | |
520 | .name = "debug", | |
521 | .attrs = btrfs_debug_feature_attrs, | |
522 | }; | |
523 | ||
524 | #endif | |
525 | ||
6ab0a202 JM |
526 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
527 | { | |
528 | u64 val; | |
529 | if (lock) | |
530 | spin_lock(lock); | |
531 | val = *value_ptr; | |
532 | if (lock) | |
533 | spin_unlock(lock); | |
abdd9feb | 534 | return scnprintf(buf, PAGE_SIZE, "%llu\n", val); |
6ab0a202 JM |
535 | } |
536 | ||
537 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
538 | struct kobj_attribute *ka, char *buf) | |
539 | { | |
540 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
541 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
542 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
543 | } | |
a969f4cc | 544 | BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
545 | |
546 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
547 | struct kobj_attribute *a, char *buf) | |
548 | { | |
549 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
550 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
551 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
552 | } | |
a969f4cc | 553 | BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
554 | |
555 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 556 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
557 | |
558 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
559 | struct kobj_attribute *attr, char *buf); | |
a969f4cc HK |
560 | BTRFS_ATTR(raid, total_bytes, raid_bytes_show); |
561 | BTRFS_ATTR(raid, used_bytes, raid_bytes_show); | |
6ab0a202 JM |
562 | |
563 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
564 | struct kobj_attribute *attr, char *buf) | |
565 | ||
566 | { | |
567 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
32da5386 | 568 | struct btrfs_block_group *block_group; |
75cb379d | 569 | int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); |
6ab0a202 JM |
570 | u64 val = 0; |
571 | ||
572 | down_read(&sinfo->groups_sem); | |
573 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
a969f4cc | 574 | if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) |
b3470b5d | 575 | val += block_group->length; |
6ab0a202 | 576 | else |
bf38be65 | 577 | val += block_group->used; |
6ab0a202 JM |
578 | } |
579 | up_read(&sinfo->groups_sem); | |
abdd9feb | 580 | return scnprintf(buf, PAGE_SIZE, "%llu\n", val); |
6ab0a202 JM |
581 | } |
582 | ||
7c7e3014 | 583 | static struct attribute *raid_attrs[] = { |
a969f4cc HK |
584 | BTRFS_ATTR_PTR(raid, total_bytes), |
585 | BTRFS_ATTR_PTR(raid, used_bytes), | |
6ab0a202 JM |
586 | NULL |
587 | }; | |
7c7e3014 | 588 | ATTRIBUTE_GROUPS(raid); |
6ab0a202 JM |
589 | |
590 | static void release_raid_kobj(struct kobject *kobj) | |
591 | { | |
c1895442 | 592 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
593 | } |
594 | ||
536ea45c | 595 | static struct kobj_type btrfs_raid_ktype = { |
6ab0a202 JM |
596 | .sysfs_ops = &kobj_sysfs_ops, |
597 | .release = release_raid_kobj, | |
7c7e3014 | 598 | .default_groups = raid_groups, |
6ab0a202 JM |
599 | }; |
600 | ||
601 | #define SPACE_INFO_ATTR(field) \ | |
602 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
603 | struct kobj_attribute *a, \ | |
604 | char *buf) \ | |
605 | { \ | |
606 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
607 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
608 | } \ | |
a969f4cc | 609 | BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) |
6ab0a202 JM |
610 | |
611 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
612 | struct kobj_attribute *a, | |
613 | char *buf) | |
614 | { | |
615 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
616 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
abdd9feb | 617 | return scnprintf(buf, PAGE_SIZE, "%lld\n", val); |
6ab0a202 JM |
618 | } |
619 | ||
620 | SPACE_INFO_ATTR(flags); | |
621 | SPACE_INFO_ATTR(total_bytes); | |
622 | SPACE_INFO_ATTR(bytes_used); | |
623 | SPACE_INFO_ATTR(bytes_pinned); | |
624 | SPACE_INFO_ATTR(bytes_reserved); | |
625 | SPACE_INFO_ATTR(bytes_may_use); | |
c1fd5c30 | 626 | SPACE_INFO_ATTR(bytes_readonly); |
6ab0a202 JM |
627 | SPACE_INFO_ATTR(disk_used); |
628 | SPACE_INFO_ATTR(disk_total); | |
a969f4cc HK |
629 | BTRFS_ATTR(space_info, total_bytes_pinned, |
630 | btrfs_space_info_show_total_bytes_pinned); | |
6ab0a202 JM |
631 | |
632 | static struct attribute *space_info_attrs[] = { | |
a969f4cc HK |
633 | BTRFS_ATTR_PTR(space_info, flags), |
634 | BTRFS_ATTR_PTR(space_info, total_bytes), | |
635 | BTRFS_ATTR_PTR(space_info, bytes_used), | |
636 | BTRFS_ATTR_PTR(space_info, bytes_pinned), | |
637 | BTRFS_ATTR_PTR(space_info, bytes_reserved), | |
638 | BTRFS_ATTR_PTR(space_info, bytes_may_use), | |
639 | BTRFS_ATTR_PTR(space_info, bytes_readonly), | |
640 | BTRFS_ATTR_PTR(space_info, disk_used), | |
641 | BTRFS_ATTR_PTR(space_info, disk_total), | |
642 | BTRFS_ATTR_PTR(space_info, total_bytes_pinned), | |
6ab0a202 JM |
643 | NULL, |
644 | }; | |
7c7e3014 | 645 | ATTRIBUTE_GROUPS(space_info); |
6ab0a202 JM |
646 | |
647 | static void space_info_release(struct kobject *kobj) | |
648 | { | |
649 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
650 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
651 | kfree(sinfo); | |
652 | } | |
653 | ||
27992d01 | 654 | static struct kobj_type space_info_ktype = { |
6ab0a202 JM |
655 | .sysfs_ops = &kobj_sysfs_ops, |
656 | .release = space_info_release, | |
7c7e3014 | 657 | .default_groups = space_info_groups, |
6ab0a202 JM |
658 | }; |
659 | ||
660 | static const struct attribute *allocation_attrs[] = { | |
a969f4cc HK |
661 | BTRFS_ATTR_PTR(allocation, global_rsv_reserved), |
662 | BTRFS_ATTR_PTR(allocation, global_rsv_size), | |
6ab0a202 JM |
663 | NULL, |
664 | }; | |
665 | ||
f8ba9c11 JM |
666 | static ssize_t btrfs_label_show(struct kobject *kobj, |
667 | struct kobj_attribute *a, char *buf) | |
668 | { | |
669 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 670 | char *label = fs_info->super_copy->label; |
ee17fc80 DS |
671 | ssize_t ret; |
672 | ||
673 | spin_lock(&fs_info->super_lock); | |
abdd9feb | 674 | ret = scnprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); |
ee17fc80 DS |
675 | spin_unlock(&fs_info->super_lock); |
676 | ||
677 | return ret; | |
f8ba9c11 JM |
678 | } |
679 | ||
680 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
681 | struct kobj_attribute *a, | |
682 | const char *buf, size_t len) | |
683 | { | |
684 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 685 | size_t p_len; |
f8ba9c11 | 686 | |
66ac9fe7 DS |
687 | if (!fs_info) |
688 | return -EPERM; | |
689 | ||
bc98a42c | 690 | if (sb_rdonly(fs_info->sb)) |
79aec2b8 AJ |
691 | return -EROFS; |
692 | ||
48fcc3ff ST |
693 | /* |
694 | * p_len is the len until the first occurrence of either | |
695 | * '\n' or '\0' | |
696 | */ | |
697 | p_len = strcspn(buf, "\n"); | |
698 | ||
699 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 700 | return -EINVAL; |
f8ba9c11 | 701 | |
a6f69dc8 | 702 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
703 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
704 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 705 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 706 | |
a6f69dc8 DS |
707 | /* |
708 | * We don't want to do full transaction commit from inside sysfs | |
709 | */ | |
710 | btrfs_set_pending(fs_info, COMMIT); | |
711 | wake_up_process(fs_info->transaction_kthread); | |
f8ba9c11 | 712 | |
a6f69dc8 | 713 | return len; |
f8ba9c11 | 714 | } |
a969f4cc | 715 | BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 716 | |
df93589a DS |
717 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
718 | struct kobj_attribute *a, char *buf) | |
719 | { | |
720 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
721 | ||
abdd9feb | 722 | return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); |
df93589a DS |
723 | } |
724 | ||
a969f4cc | 725 | BTRFS_ATTR(, nodesize, btrfs_nodesize_show); |
df93589a DS |
726 | |
727 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
728 | struct kobj_attribute *a, char *buf) | |
729 | { | |
730 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
731 | ||
abdd9feb TI |
732 | return scnprintf(buf, PAGE_SIZE, "%u\n", |
733 | fs_info->super_copy->sectorsize); | |
df93589a DS |
734 | } |
735 | ||
a969f4cc | 736 | BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); |
df93589a DS |
737 | |
738 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
739 | struct kobj_attribute *a, char *buf) | |
740 | { | |
741 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
742 | ||
abdd9feb | 743 | return scnprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); |
df93589a DS |
744 | } |
745 | ||
a969f4cc | 746 | BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); |
df93589a | 747 | |
2723480a SD |
748 | static ssize_t quota_override_show(struct kobject *kobj, |
749 | struct kobj_attribute *a, char *buf) | |
750 | { | |
751 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
752 | int quota_override; | |
753 | ||
754 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
abdd9feb | 755 | return scnprintf(buf, PAGE_SIZE, "%d\n", quota_override); |
2723480a SD |
756 | } |
757 | ||
758 | static ssize_t quota_override_store(struct kobject *kobj, | |
759 | struct kobj_attribute *a, | |
760 | const char *buf, size_t len) | |
761 | { | |
762 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
763 | unsigned long knob; | |
764 | int err; | |
765 | ||
766 | if (!fs_info) | |
767 | return -EPERM; | |
768 | ||
769 | if (!capable(CAP_SYS_RESOURCE)) | |
770 | return -EPERM; | |
771 | ||
772 | err = kstrtoul(buf, 10, &knob); | |
773 | if (err) | |
774 | return err; | |
775 | if (knob > 1) | |
776 | return -EINVAL; | |
777 | ||
778 | if (knob) | |
779 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
780 | else | |
781 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
782 | ||
783 | return len; | |
784 | } | |
785 | ||
a969f4cc | 786 | BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); |
2723480a | 787 | |
56f20f40 NB |
788 | static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, |
789 | struct kobj_attribute *a, char *buf) | |
790 | { | |
791 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
792 | ||
abdd9feb | 793 | return scnprintf(buf, PAGE_SIZE, "%pU\n", |
56f20f40 NB |
794 | fs_info->fs_devices->metadata_uuid); |
795 | } | |
796 | ||
797 | BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); | |
798 | ||
41e6d2a8 JT |
799 | static ssize_t btrfs_checksum_show(struct kobject *kobj, |
800 | struct kobj_attribute *a, char *buf) | |
801 | { | |
802 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
803 | u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
804 | ||
abdd9feb | 805 | return scnprintf(buf, PAGE_SIZE, "%s (%s)\n", |
41e6d2a8 JT |
806 | btrfs_super_csum_name(csum_type), |
807 | crypto_shash_driver_name(fs_info->csum_shash)); | |
808 | } | |
809 | ||
810 | BTRFS_ATTR(, checksum, btrfs_checksum_show); | |
811 | ||
0dd2906f | 812 | static const struct attribute *btrfs_attrs[] = { |
a969f4cc HK |
813 | BTRFS_ATTR_PTR(, label), |
814 | BTRFS_ATTR_PTR(, nodesize), | |
815 | BTRFS_ATTR_PTR(, sectorsize), | |
816 | BTRFS_ATTR_PTR(, clone_alignment), | |
817 | BTRFS_ATTR_PTR(, quota_override), | |
56f20f40 | 818 | BTRFS_ATTR_PTR(, metadata_uuid), |
41e6d2a8 | 819 | BTRFS_ATTR_PTR(, checksum), |
f8ba9c11 JM |
820 | NULL, |
821 | }; | |
822 | ||
c1b7e474 | 823 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
510d7360 | 824 | { |
2e7910d6 | 825 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
248d200d | 826 | |
c1b7e474 | 827 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
2e7910d6 | 828 | complete(&fs_devs->kobj_unregister); |
510d7360 JM |
829 | } |
830 | ||
831 | static struct kobj_type btrfs_ktype = { | |
832 | .sysfs_ops = &kobj_sysfs_ops, | |
c1b7e474 | 833 | .release = btrfs_release_fsid_kobj, |
510d7360 JM |
834 | }; |
835 | ||
2e7910d6 AJ |
836 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
837 | { | |
838 | if (kobj->ktype != &btrfs_ktype) | |
839 | return NULL; | |
c1b7e474 | 840 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
2e7910d6 AJ |
841 | } |
842 | ||
510d7360 JM |
843 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
844 | { | |
845 | if (kobj->ktype != &btrfs_ktype) | |
846 | return NULL; | |
2e7910d6 | 847 | return to_fs_devs(kobj)->fs_info; |
510d7360 | 848 | } |
58176a96 | 849 | |
e453d989 | 850 | #define NUM_FEATURE_BITS 64 |
6c52157f TM |
851 | #define BTRFS_FEATURE_NAME_MAX 13 |
852 | static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; | |
853 | static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; | |
e453d989 | 854 | |
6c52157f | 855 | static const u64 supported_feature_masks[FEAT_MAX] = { |
e453d989 JM |
856 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
857 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
858 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
859 | }; | |
860 | ||
861 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
862 | { | |
863 | int set; | |
864 | ||
865 | for (set = 0; set < FEAT_MAX; set++) { | |
866 | int i; | |
867 | struct attribute *attrs[2]; | |
868 | struct attribute_group agroup = { | |
869 | .name = "features", | |
870 | .attrs = attrs, | |
871 | }; | |
872 | u64 features = get_features(fs_info, set); | |
873 | features &= ~supported_feature_masks[set]; | |
874 | ||
875 | if (!features) | |
876 | continue; | |
877 | ||
878 | attrs[1] = NULL; | |
879 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
880 | struct btrfs_feature_attr *fa; | |
881 | ||
882 | if (!(features & (1ULL << i))) | |
883 | continue; | |
884 | ||
885 | fa = &btrfs_feature_attrs[set][i]; | |
886 | attrs[0] = &fa->kobj_attr.attr; | |
887 | if (add) { | |
888 | int ret; | |
c1b7e474 | 889 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
890 | &agroup); |
891 | if (ret) | |
892 | return ret; | |
893 | } else | |
c1b7e474 | 894 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
895 | &agroup); |
896 | } | |
897 | ||
898 | } | |
899 | return 0; | |
900 | } | |
901 | ||
2e3e1281 | 902 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 | 903 | { |
a013d141 AJ |
904 | if (fs_devs->devinfo_kobj) { |
905 | kobject_del(fs_devs->devinfo_kobj); | |
906 | kobject_put(fs_devs->devinfo_kobj); | |
907 | fs_devs->devinfo_kobj = NULL; | |
908 | } | |
909 | ||
b5501504 AJ |
910 | if (fs_devs->devices_kobj) { |
911 | kobject_del(fs_devs->devices_kobj); | |
912 | kobject_put(fs_devs->devices_kobj); | |
913 | fs_devs->devices_kobj = NULL; | |
aaf13305 AJ |
914 | } |
915 | ||
c1b7e474 AJ |
916 | if (fs_devs->fsid_kobj.state_initialized) { |
917 | kobject_del(&fs_devs->fsid_kobj); | |
918 | kobject_put(&fs_devs->fsid_kobj); | |
f90fc547 AJ |
919 | wait_for_completion(&fs_devs->kobj_unregister); |
920 | } | |
5ac1d209 JM |
921 | } |
922 | ||
2e3e1281 | 923 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1d1c1be3 | 924 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
2e3e1281 AJ |
925 | { |
926 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
927 | ||
928 | if (fs_devs) { | |
929 | __btrfs_sysfs_remove_fsid(fs_devs); | |
930 | return; | |
931 | } | |
932 | ||
c4babc5e | 933 | list_for_each_entry(fs_devs, fs_uuids, fs_list) { |
2e3e1281 AJ |
934 | __btrfs_sysfs_remove_fsid(fs_devs); |
935 | } | |
936 | } | |
937 | ||
6618a59b | 938 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
e453d989 | 939 | { |
3092c68f NB |
940 | struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; |
941 | ||
5a13f430 AJ |
942 | btrfs_reset_fs_info_ptr(fs_info); |
943 | ||
3092c68f NB |
944 | sysfs_remove_link(fsid_kobj, "bdi"); |
945 | ||
e453d989 JM |
946 | if (fs_info->space_info_kobj) { |
947 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
948 | kobject_del(fs_info->space_info_kobj); | |
949 | kobject_put(fs_info->space_info_kobj); | |
950 | } | |
71e8978e | 951 | #ifdef CONFIG_BTRFS_DEBUG |
e4faab84 DZ |
952 | if (fs_info->discard_debug_kobj) { |
953 | sysfs_remove_files(fs_info->discard_debug_kobj, | |
954 | discard_debug_attrs); | |
955 | kobject_del(fs_info->discard_debug_kobj); | |
956 | kobject_put(fs_info->discard_debug_kobj); | |
957 | } | |
93945cb4 DZ |
958 | if (fs_info->debug_kobj) { |
959 | sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); | |
960 | kobject_del(fs_info->debug_kobj); | |
961 | kobject_put(fs_info->debug_kobj); | |
962 | } | |
71e8978e | 963 | #endif |
e453d989 | 964 | addrm_unknown_feature_attrs(fs_info, false); |
3092c68f NB |
965 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); |
966 | sysfs_remove_files(fsid_kobj, btrfs_attrs); | |
f3cd2c58 | 967 | btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, NULL); |
e453d989 JM |
968 | } |
969 | ||
f10152bc | 970 | static const char * const btrfs_feature_set_names[FEAT_MAX] = { |
79da4fa4 JM |
971 | [FEAT_COMPAT] = "compat", |
972 | [FEAT_COMPAT_RO] = "compat_ro", | |
973 | [FEAT_INCOMPAT] = "incompat", | |
974 | }; | |
975 | ||
f10152bc DS |
976 | const char * const btrfs_feature_set_name(enum btrfs_feature_set set) |
977 | { | |
978 | return btrfs_feature_set_names[set]; | |
979 | } | |
980 | ||
3b02a68a JM |
981 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
982 | { | |
983 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
984 | int len = 0; | |
985 | int i; | |
986 | char *str; | |
987 | ||
988 | str = kmalloc(bufsize, GFP_KERNEL); | |
989 | if (!str) | |
990 | return str; | |
991 | ||
992 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
993 | const char *name; | |
994 | ||
995 | if (!(flags & (1ULL << i))) | |
996 | continue; | |
997 | ||
998 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
abdd9feb | 999 | len += scnprintf(str + len, bufsize - len, "%s%s", |
3b02a68a JM |
1000 | len ? "," : "", name); |
1001 | } | |
1002 | ||
1003 | return str; | |
1004 | } | |
1005 | ||
79da4fa4 JM |
1006 | static void init_feature_attrs(void) |
1007 | { | |
1008 | struct btrfs_feature_attr *fa; | |
1009 | int set, i; | |
1010 | ||
1011 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
1012 | ARRAY_SIZE(btrfs_feature_attrs)); | |
1013 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
1014 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
1015 | ||
3b02a68a JM |
1016 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
1017 | memset(btrfs_unknown_feature_names, 0, | |
1018 | sizeof(btrfs_unknown_feature_names)); | |
1019 | ||
79da4fa4 JM |
1020 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
1021 | struct btrfs_feature_attr *sfa; | |
1022 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 1023 | int bit; |
79da4fa4 | 1024 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
1025 | bit = ilog2(sfa->feature_bit); |
1026 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
1027 | |
1028 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
1029 | } | |
1030 | ||
1031 | for (set = 0; set < FEAT_MAX; set++) { | |
1032 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
1033 | char *name = btrfs_unknown_feature_names[set][i]; | |
1034 | fa = &btrfs_feature_attrs[set][i]; | |
1035 | ||
1036 | if (fa->kobj_attr.attr.name) | |
1037 | continue; | |
1038 | ||
6c52157f | 1039 | snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", |
79da4fa4 JM |
1040 | btrfs_feature_set_names[set], i); |
1041 | ||
1042 | fa->kobj_attr.attr.name = name; | |
1043 | fa->kobj_attr.attr.mode = S_IRUGO; | |
1044 | fa->feature_set = set; | |
1045 | fa->feature_bit = 1ULL << i; | |
1046 | } | |
1047 | } | |
1048 | } | |
1049 | ||
32a9991f DS |
1050 | /* |
1051 | * Create a sysfs entry for a given block group type at path | |
1052 | * /sys/fs/btrfs/UUID/allocation/data/TYPE | |
1053 | */ | |
32da5386 | 1054 | void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) |
32a9991f DS |
1055 | { |
1056 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
1057 | struct btrfs_space_info *space_info = cache->space_info; | |
1058 | struct raid_kobject *rkobj; | |
1059 | const int index = btrfs_bg_flags_to_raid_index(cache->flags); | |
1060 | unsigned int nofs_flag; | |
1061 | int ret; | |
1062 | ||
1063 | /* | |
1064 | * Setup a NOFS context because kobject_add(), deep in its call chain, | |
1065 | * does GFP_KERNEL allocations, and we are often called in a context | |
1066 | * where if reclaim is triggered we can deadlock (we are either holding | |
1067 | * a transaction handle or some lock required for a transaction | |
1068 | * commit). | |
1069 | */ | |
1070 | nofs_flag = memalloc_nofs_save(); | |
1071 | ||
1072 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); | |
1073 | if (!rkobj) { | |
1074 | memalloc_nofs_restore(nofs_flag); | |
1075 | btrfs_warn(cache->fs_info, | |
1076 | "couldn't alloc memory for raid level kobject"); | |
1077 | return; | |
1078 | } | |
1079 | ||
1080 | rkobj->flags = cache->flags; | |
1081 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
1082 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", | |
1083 | btrfs_bg_type_to_raid_name(rkobj->flags)); | |
1084 | memalloc_nofs_restore(nofs_flag); | |
1085 | if (ret) { | |
1086 | kobject_put(&rkobj->kobj); | |
1087 | btrfs_warn(fs_info, | |
1088 | "failed to add kobject for block cache, ignoring"); | |
1089 | return; | |
1090 | } | |
1091 | ||
1092 | space_info->block_group_kobjs[index] = &rkobj->kobj; | |
1093 | } | |
1094 | ||
b5865bab DS |
1095 | /* |
1096 | * Remove sysfs directories for all block group types of a given space info and | |
1097 | * the space info as well | |
1098 | */ | |
1099 | void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) | |
1100 | { | |
1101 | int i; | |
1102 | ||
1103 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
1104 | struct kobject *kobj; | |
1105 | ||
1106 | kobj = space_info->block_group_kobjs[i]; | |
1107 | space_info->block_group_kobjs[i] = NULL; | |
1108 | if (kobj) { | |
1109 | kobject_del(kobj); | |
1110 | kobject_put(kobj); | |
1111 | } | |
1112 | } | |
1113 | kobject_del(&space_info->kobj); | |
1114 | kobject_put(&space_info->kobj); | |
1115 | } | |
1116 | ||
b882327a DS |
1117 | static const char *alloc_name(u64 flags) |
1118 | { | |
1119 | switch (flags) { | |
1120 | case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: | |
1121 | return "mixed"; | |
1122 | case BTRFS_BLOCK_GROUP_METADATA: | |
1123 | return "metadata"; | |
1124 | case BTRFS_BLOCK_GROUP_DATA: | |
1125 | return "data"; | |
1126 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
1127 | return "system"; | |
1128 | default: | |
1129 | WARN_ON(1); | |
1130 | return "invalid-combination"; | |
1131 | }; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Create a sysfs entry for a space info type at path | |
1136 | * /sys/fs/btrfs/UUID/allocation/TYPE | |
1137 | */ | |
1138 | int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, | |
1139 | struct btrfs_space_info *space_info) | |
1140 | { | |
1141 | int ret; | |
1142 | ||
1143 | ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, | |
1144 | fs_info->space_info_kobj, "%s", | |
1145 | alloc_name(space_info->flags)); | |
1146 | if (ret) { | |
1147 | kobject_put(&space_info->kobj); | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | return 0; | |
1152 | } | |
1153 | ||
e7e1aa9c AJ |
1154 | /* when one_device is NULL, it removes all device links */ |
1155 | ||
f3cd2c58 | 1156 | int btrfs_sysfs_remove_devices_dir(struct btrfs_fs_devices *fs_devices, |
99994cde AJ |
1157 | struct btrfs_device *one_device) |
1158 | { | |
1159 | struct hd_struct *disk; | |
1160 | struct kobject *disk_kobj; | |
1161 | ||
b5501504 | 1162 | if (!fs_devices->devices_kobj) |
99994cde AJ |
1163 | return -EINVAL; |
1164 | ||
668e48af AJ |
1165 | if (one_device) { |
1166 | if (one_device->bdev) { | |
1167 | disk = one_device->bdev->bd_part; | |
1168 | disk_kobj = &part_to_dev(disk)->kobj; | |
1169 | sysfs_remove_link(fs_devices->devices_kobj, | |
1170 | disk_kobj->name); | |
1171 | } | |
99994cde | 1172 | |
668e48af AJ |
1173 | kobject_del(&one_device->devid_kobj); |
1174 | kobject_put(&one_device->devid_kobj); | |
1175 | ||
1176 | wait_for_completion(&one_device->kobj_unregister); | |
99994cde | 1177 | |
e7e1aa9c | 1178 | return 0; |
668e48af | 1179 | } |
e7e1aa9c | 1180 | |
668e48af AJ |
1181 | list_for_each_entry(one_device, &fs_devices->devices, dev_list) { |
1182 | ||
1183 | if (one_device->bdev) { | |
1184 | disk = one_device->bdev->bd_part; | |
1185 | disk_kobj = &part_to_dev(disk)->kobj; | |
1186 | sysfs_remove_link(fs_devices->devices_kobj, | |
1187 | disk_kobj->name); | |
1188 | } | |
1189 | kobject_del(&one_device->devid_kobj); | |
1190 | kobject_put(&one_device->devid_kobj); | |
e7e1aa9c | 1191 | |
668e48af | 1192 | wait_for_completion(&one_device->kobj_unregister); |
e7e1aa9c AJ |
1193 | } |
1194 | ||
99994cde AJ |
1195 | return 0; |
1196 | } | |
1197 | ||
668e48af AJ |
1198 | static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, |
1199 | struct kobj_attribute *a, | |
1200 | char *buf) | |
1201 | { | |
1202 | int val; | |
1203 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1204 | devid_kobj); | |
1205 | ||
1206 | val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
1207 | ||
abdd9feb | 1208 | return scnprintf(buf, PAGE_SIZE, "%d\n", val); |
668e48af AJ |
1209 | } |
1210 | BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); | |
1211 | ||
25864778 | 1212 | static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, |
668e48af AJ |
1213 | struct kobj_attribute *a, char *buf) |
1214 | { | |
1215 | int val; | |
1216 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1217 | devid_kobj); | |
1218 | ||
1219 | val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); | |
1220 | ||
abdd9feb | 1221 | return scnprintf(buf, PAGE_SIZE, "%d\n", val); |
668e48af | 1222 | } |
25864778 | 1223 | BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); |
668e48af AJ |
1224 | |
1225 | static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, | |
1226 | struct kobj_attribute *a, | |
1227 | char *buf) | |
1228 | { | |
1229 | int val; | |
1230 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1231 | devid_kobj); | |
1232 | ||
1233 | val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
1234 | ||
abdd9feb | 1235 | return scnprintf(buf, PAGE_SIZE, "%d\n", val); |
668e48af AJ |
1236 | } |
1237 | BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); | |
1238 | ||
1239 | static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, | |
1240 | struct kobj_attribute *a, char *buf) | |
1241 | { | |
1242 | int val; | |
1243 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1244 | devid_kobj); | |
1245 | ||
1246 | val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); | |
1247 | ||
abdd9feb | 1248 | return scnprintf(buf, PAGE_SIZE, "%d\n", val); |
668e48af AJ |
1249 | } |
1250 | BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); | |
1251 | ||
1252 | static struct attribute *devid_attrs[] = { | |
1253 | BTRFS_ATTR_PTR(devid, in_fs_metadata), | |
1254 | BTRFS_ATTR_PTR(devid, missing), | |
1255 | BTRFS_ATTR_PTR(devid, replace_target), | |
1256 | BTRFS_ATTR_PTR(devid, writeable), | |
1257 | NULL | |
1258 | }; | |
1259 | ATTRIBUTE_GROUPS(devid); | |
1260 | ||
1261 | static void btrfs_release_devid_kobj(struct kobject *kobj) | |
1262 | { | |
1263 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1264 | devid_kobj); | |
1265 | ||
1266 | memset(&device->devid_kobj, 0, sizeof(struct kobject)); | |
1267 | complete(&device->kobj_unregister); | |
1268 | } | |
1269 | ||
1270 | static struct kobj_type devid_ktype = { | |
1271 | .sysfs_ops = &kobj_sysfs_ops, | |
1272 | .default_groups = devid_groups, | |
1273 | .release = btrfs_release_devid_kobj, | |
1274 | }; | |
1275 | ||
f3cd2c58 | 1276 | int btrfs_sysfs_add_devices_dir(struct btrfs_fs_devices *fs_devices, |
1ba43816 | 1277 | struct btrfs_device *one_device) |
00c921c2 AJ |
1278 | { |
1279 | int error = 0; | |
00c921c2 | 1280 | struct btrfs_device *dev; |
a47bd78d | 1281 | unsigned int nofs_flag; |
00c921c2 | 1282 | |
a47bd78d | 1283 | nofs_flag = memalloc_nofs_save(); |
29e5be24 | 1284 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
f085381e | 1285 | |
0d39376a AJ |
1286 | if (one_device && one_device != dev) |
1287 | continue; | |
1288 | ||
668e48af AJ |
1289 | if (dev->bdev) { |
1290 | struct hd_struct *disk; | |
1291 | struct kobject *disk_kobj; | |
1292 | ||
1293 | disk = dev->bdev->bd_part; | |
1294 | disk_kobj = &part_to_dev(disk)->kobj; | |
1295 | ||
1296 | error = sysfs_create_link(fs_devices->devices_kobj, | |
1297 | disk_kobj, disk_kobj->name); | |
1298 | if (error) | |
1299 | break; | |
1300 | } | |
29e5be24 | 1301 | |
668e48af AJ |
1302 | init_completion(&dev->kobj_unregister); |
1303 | error = kobject_init_and_add(&dev->devid_kobj, &devid_ktype, | |
1b9867eb | 1304 | fs_devices->devinfo_kobj, "%llu", |
668e48af AJ |
1305 | dev->devid); |
1306 | if (error) { | |
1307 | kobject_put(&dev->devid_kobj); | |
29e5be24 | 1308 | break; |
668e48af | 1309 | } |
29e5be24 | 1310 | } |
a47bd78d | 1311 | memalloc_nofs_restore(nofs_flag); |
29e5be24 JM |
1312 | |
1313 | return error; | |
1314 | } | |
1315 | ||
5b28692e DS |
1316 | void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) |
1317 | { | |
1318 | int ret; | |
1319 | ||
1320 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
1321 | if (ret) | |
1322 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", | |
1323 | action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
1324 | &disk_to_dev(bdev->bd_disk)->kobj); | |
1325 | } | |
1326 | ||
f93c3997 DS |
1327 | void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices, |
1328 | const u8 *fsid) | |
1329 | { | |
1330 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
1331 | ||
1332 | /* | |
1333 | * Sprouting changes fsid of the mounted filesystem, rename the fsid | |
1334 | * directory | |
1335 | */ | |
1336 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid); | |
1337 | if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) | |
1338 | btrfs_warn(fs_devices->fs_info, | |
1339 | "sysfs: failed to create fsid for sprout"); | |
1340 | } | |
1341 | ||
668e48af AJ |
1342 | void btrfs_sysfs_update_devid(struct btrfs_device *device) |
1343 | { | |
1344 | char tmp[24]; | |
1345 | ||
1346 | snprintf(tmp, sizeof(tmp), "%llu", device->devid); | |
1347 | ||
1348 | if (kobject_rename(&device->devid_kobj, tmp)) | |
1349 | btrfs_warn(device->fs_devices->fs_info, | |
1350 | "sysfs: failed to update devid for %llu", | |
1351 | device->devid); | |
1352 | } | |
1353 | ||
510d7360 JM |
1354 | /* /sys/fs/btrfs/ entry */ |
1355 | static struct kset *btrfs_kset; | |
1356 | ||
72059215 | 1357 | /* |
c6761a9e AJ |
1358 | * Creates: |
1359 | * /sys/fs/btrfs/UUID | |
1360 | * | |
72059215 | 1361 | * Can be called by the device discovery thread. |
72059215 | 1362 | */ |
c6761a9e | 1363 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 JM |
1364 | { |
1365 | int error; | |
1366 | ||
2e7910d6 | 1367 | init_completion(&fs_devs->kobj_unregister); |
c1b7e474 | 1368 | fs_devs->fsid_kobj.kset = btrfs_kset; |
c6761a9e AJ |
1369 | error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, |
1370 | "%pU", fs_devs->fsid); | |
e3277335 TH |
1371 | if (error) { |
1372 | kobject_put(&fs_devs->fsid_kobj); | |
1373 | return error; | |
1374 | } | |
1375 | ||
bc036bb3 AJ |
1376 | fs_devs->devices_kobj = kobject_create_and_add("devices", |
1377 | &fs_devs->fsid_kobj); | |
1378 | if (!fs_devs->devices_kobj) { | |
1379 | btrfs_err(fs_devs->fs_info, | |
1380 | "failed to init sysfs device interface"); | |
1f6087e6 | 1381 | btrfs_sysfs_remove_fsid(fs_devs); |
bc036bb3 AJ |
1382 | return -ENOMEM; |
1383 | } | |
1384 | ||
a013d141 AJ |
1385 | fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", |
1386 | &fs_devs->fsid_kobj); | |
1387 | if (!fs_devs->devinfo_kobj) { | |
1388 | btrfs_err(fs_devs->fs_info, | |
1389 | "failed to init sysfs devinfo kobject"); | |
1390 | btrfs_sysfs_remove_fsid(fs_devs); | |
1391 | return -ENOMEM; | |
1392 | } | |
1393 | ||
e3277335 | 1394 | return 0; |
72059215 AJ |
1395 | } |
1396 | ||
96f3136e | 1397 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
72059215 AJ |
1398 | { |
1399 | int error; | |
2e7910d6 | 1400 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e474 | 1401 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
72059215 | 1402 | |
5a13f430 AJ |
1403 | btrfs_set_fs_info_ptr(fs_info); |
1404 | ||
f3cd2c58 | 1405 | error = btrfs_sysfs_add_devices_dir(fs_devs, NULL); |
b7c35e81 | 1406 | if (error) |
aaf13305 | 1407 | return error; |
aaf13305 | 1408 | |
c1b7e474 | 1409 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989 | 1410 | if (error) { |
f3cd2c58 | 1411 | btrfs_sysfs_remove_devices_dir(fs_devs, NULL); |
e453d989 JM |
1412 | return error; |
1413 | } | |
79da4fa4 | 1414 | |
c1b7e474 | 1415 | error = sysfs_create_group(fsid_kobj, |
0dd2906f AJ |
1416 | &btrfs_feature_attr_group); |
1417 | if (error) | |
1418 | goto failure; | |
1419 | ||
6e369feb | 1420 | #ifdef CONFIG_BTRFS_DEBUG |
93945cb4 DZ |
1421 | fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); |
1422 | if (!fs_info->debug_kobj) { | |
1423 | error = -ENOMEM; | |
1424 | goto failure; | |
1425 | } | |
1426 | ||
1427 | error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); | |
6e369feb DS |
1428 | if (error) |
1429 | goto failure; | |
e4faab84 DZ |
1430 | |
1431 | /* Discard directory */ | |
1432 | fs_info->discard_debug_kobj = kobject_create_and_add("discard", | |
1433 | fs_info->debug_kobj); | |
1434 | if (!fs_info->discard_debug_kobj) { | |
1435 | error = -ENOMEM; | |
1436 | goto failure; | |
1437 | } | |
1438 | ||
1439 | error = sysfs_create_files(fs_info->discard_debug_kobj, | |
1440 | discard_debug_attrs); | |
1441 | if (error) | |
1442 | goto failure; | |
6e369feb DS |
1443 | #endif |
1444 | ||
e453d989 | 1445 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
1446 | if (error) |
1447 | goto failure; | |
1448 | ||
3092c68f NB |
1449 | error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); |
1450 | if (error) | |
1451 | goto failure; | |
1452 | ||
6ab0a202 | 1453 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e474 | 1454 | fsid_kobj); |
6ab0a202 JM |
1455 | if (!fs_info->space_info_kobj) { |
1456 | error = -ENOMEM; | |
1457 | goto failure; | |
1458 | } | |
1459 | ||
1460 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
1461 | if (error) | |
1462 | goto failure; | |
1463 | ||
79da4fa4 JM |
1464 | return 0; |
1465 | failure: | |
6618a59b | 1466 | btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209 JM |
1467 | return error; |
1468 | } | |
1469 | ||
49e5fb46 QW |
1470 | static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) |
1471 | { | |
1472 | return to_fs_info(kobj->parent->parent); | |
1473 | } | |
1474 | ||
1475 | #define QGROUP_ATTR(_member, _show_name) \ | |
1476 | static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ | |
1477 | struct kobj_attribute *a, \ | |
1478 | char *buf) \ | |
1479 | { \ | |
1480 | struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ | |
1481 | struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ | |
1482 | struct btrfs_qgroup, kobj); \ | |
1483 | return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ | |
1484 | } \ | |
1485 | BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) | |
1486 | ||
1487 | #define QGROUP_RSV_ATTR(_name, _type) \ | |
1488 | static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ | |
1489 | struct kobj_attribute *a, \ | |
1490 | char *buf) \ | |
1491 | { \ | |
1492 | struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ | |
1493 | struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ | |
1494 | struct btrfs_qgroup, kobj); \ | |
1495 | return btrfs_show_u64(&qgroup->rsv.values[_type], \ | |
1496 | &fs_info->qgroup_lock, buf); \ | |
1497 | } \ | |
1498 | BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) | |
1499 | ||
1500 | QGROUP_ATTR(rfer, referenced); | |
1501 | QGROUP_ATTR(excl, exclusive); | |
1502 | QGROUP_ATTR(max_rfer, max_referenced); | |
1503 | QGROUP_ATTR(max_excl, max_exclusive); | |
1504 | QGROUP_ATTR(lim_flags, limit_flags); | |
1505 | QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); | |
1506 | QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); | |
1507 | QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); | |
1508 | ||
1509 | static struct attribute *qgroup_attrs[] = { | |
1510 | BTRFS_ATTR_PTR(qgroup, referenced), | |
1511 | BTRFS_ATTR_PTR(qgroup, exclusive), | |
1512 | BTRFS_ATTR_PTR(qgroup, max_referenced), | |
1513 | BTRFS_ATTR_PTR(qgroup, max_exclusive), | |
1514 | BTRFS_ATTR_PTR(qgroup, limit_flags), | |
1515 | BTRFS_ATTR_PTR(qgroup, rsv_data), | |
1516 | BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), | |
1517 | BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), | |
1518 | NULL | |
1519 | }; | |
1520 | ATTRIBUTE_GROUPS(qgroup); | |
1521 | ||
1522 | static void qgroup_release(struct kobject *kobj) | |
1523 | { | |
1524 | struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); | |
1525 | ||
1526 | memset(&qgroup->kobj, 0, sizeof(*kobj)); | |
1527 | } | |
1528 | ||
1529 | static struct kobj_type qgroup_ktype = { | |
1530 | .sysfs_ops = &kobj_sysfs_ops, | |
1531 | .release = qgroup_release, | |
1532 | .default_groups = qgroup_groups, | |
1533 | }; | |
1534 | ||
1535 | int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, | |
1536 | struct btrfs_qgroup *qgroup) | |
1537 | { | |
1538 | struct kobject *qgroups_kobj = fs_info->qgroups_kobj; | |
1539 | int ret; | |
1540 | ||
1541 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
1542 | return 0; | |
1543 | if (qgroup->kobj.state_initialized) | |
1544 | return 0; | |
1545 | if (!qgroups_kobj) | |
1546 | return -EINVAL; | |
1547 | ||
1548 | ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, | |
1549 | "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), | |
1550 | btrfs_qgroup_subvolid(qgroup->qgroupid)); | |
1551 | if (ret < 0) | |
1552 | kobject_put(&qgroup->kobj); | |
1553 | ||
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) | |
1558 | { | |
1559 | struct btrfs_qgroup *qgroup; | |
1560 | struct btrfs_qgroup *next; | |
1561 | ||
1562 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
1563 | return; | |
1564 | ||
1565 | rbtree_postorder_for_each_entry_safe(qgroup, next, | |
1566 | &fs_info->qgroup_tree, node) | |
1567 | btrfs_sysfs_del_one_qgroup(fs_info, qgroup); | |
62ab2cc0 QW |
1568 | if (fs_info->qgroups_kobj) { |
1569 | kobject_del(fs_info->qgroups_kobj); | |
1570 | kobject_put(fs_info->qgroups_kobj); | |
1571 | fs_info->qgroups_kobj = NULL; | |
1572 | } | |
49e5fb46 QW |
1573 | } |
1574 | ||
1575 | /* Called when qgroups get initialized, thus there is no need for locking */ | |
1576 | int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) | |
1577 | { | |
1578 | struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; | |
1579 | struct btrfs_qgroup *qgroup; | |
1580 | struct btrfs_qgroup *next; | |
1581 | int ret = 0; | |
1582 | ||
1583 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
1584 | return 0; | |
1585 | ||
1586 | ASSERT(fsid_kobj); | |
1587 | if (fs_info->qgroups_kobj) | |
1588 | return 0; | |
1589 | ||
1590 | fs_info->qgroups_kobj = kobject_create_and_add("qgroups", fsid_kobj); | |
1591 | if (!fs_info->qgroups_kobj) { | |
1592 | ret = -ENOMEM; | |
1593 | goto out; | |
1594 | } | |
1595 | rbtree_postorder_for_each_entry_safe(qgroup, next, | |
1596 | &fs_info->qgroup_tree, node) { | |
1597 | ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); | |
1598 | if (ret < 0) | |
1599 | goto out; | |
1600 | } | |
1601 | ||
1602 | out: | |
1603 | if (ret < 0) | |
1604 | btrfs_sysfs_del_qgroups(fs_info); | |
1605 | return ret; | |
1606 | } | |
1607 | ||
1608 | void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, | |
1609 | struct btrfs_qgroup *qgroup) | |
1610 | { | |
1611 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
1612 | return; | |
1613 | ||
1614 | if (qgroup->kobj.state_initialized) { | |
1615 | kobject_del(&qgroup->kobj); | |
1616 | kobject_put(&qgroup->kobj); | |
1617 | } | |
1618 | } | |
444e7516 DS |
1619 | |
1620 | /* | |
1621 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
1622 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
1623 | */ | |
1624 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, | |
1625 | u64 bit, enum btrfs_feature_set set) | |
1626 | { | |
1627 | struct btrfs_fs_devices *fs_devs; | |
1628 | struct kobject *fsid_kobj; | |
1629 | u64 features; | |
1630 | int ret; | |
1631 | ||
1632 | if (!fs_info) | |
1633 | return; | |
1634 | ||
1635 | features = get_features(fs_info, set); | |
1636 | ASSERT(bit & supported_feature_masks[set]); | |
1637 | ||
1638 | fs_devs = fs_info->fs_devices; | |
1639 | fsid_kobj = &fs_devs->fsid_kobj; | |
1640 | ||
bf609206 DS |
1641 | if (!fsid_kobj->state_initialized) |
1642 | return; | |
1643 | ||
444e7516 DS |
1644 | /* |
1645 | * FIXME: this is too heavy to update just one value, ideally we'd like | |
1646 | * to use sysfs_update_group but some refactoring is needed first. | |
1647 | */ | |
1648 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); | |
1649 | ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); | |
1650 | } | |
1651 | ||
f5c29bd9 | 1652 | int __init btrfs_init_sysfs(void) |
58176a96 | 1653 | { |
079b72bc | 1654 | int ret; |
1bae3098 | 1655 | |
e3fe4e71 GKH |
1656 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
1657 | if (!btrfs_kset) | |
1658 | return -ENOMEM; | |
079b72bc | 1659 | |
1bae3098 | 1660 | init_feature_attrs(); |
079b72bc | 1661 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
1662 | if (ret) |
1663 | goto out2; | |
f902bd3a MT |
1664 | ret = sysfs_merge_group(&btrfs_kset->kobj, |
1665 | &btrfs_static_feature_attr_group); | |
1666 | if (ret) | |
1667 | goto out_remove_group; | |
001a648d | 1668 | |
6e369feb DS |
1669 | #ifdef CONFIG_BTRFS_DEBUG |
1670 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
1671 | if (ret) | |
1672 | goto out2; | |
1673 | #endif | |
1674 | ||
001a648d | 1675 | return 0; |
f902bd3a MT |
1676 | |
1677 | out_remove_group: | |
1678 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); | |
001a648d | 1679 | out2: |
001a648d | 1680 | kset_unregister(btrfs_kset); |
079b72bc | 1681 | |
1bae3098 | 1682 | return ret; |
58176a96 JB |
1683 | } |
1684 | ||
e67c718b | 1685 | void __cold btrfs_exit_sysfs(void) |
58176a96 | 1686 | { |
f902bd3a MT |
1687 | sysfs_unmerge_group(&btrfs_kset->kobj, |
1688 | &btrfs_static_feature_attr_group); | |
079b72bc | 1689 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
71e8978e DZ |
1690 | #ifdef CONFIG_BTRFS_DEBUG |
1691 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
1692 | #endif | |
e3fe4e71 | 1693 | kset_unregister(btrfs_kset); |
58176a96 | 1694 | } |
55d47414 | 1695 |