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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 CM |
14 | #include "ctree.h" |
15 | #include "disk-io.h" | |
16 | #include "transaction.h" | |
079b72bc | 17 | #include "sysfs.h" |
29e5be24 | 18 | #include "volumes.h" |
8719aaae | 19 | #include "space-info.h" |
aac0023c | 20 | #include "block-group.h" |
079b72bc | 21 | |
9188db61 DS |
22 | struct btrfs_feature_attr { |
23 | struct kobj_attribute kobj_attr; | |
24 | enum btrfs_feature_set feature_set; | |
25 | u64 feature_bit; | |
26 | }; | |
27 | ||
28 | /* For raid type sysfs entries */ | |
29 | struct raid_kobject { | |
30 | u64 flags; | |
31 | struct kobject kobj; | |
32 | }; | |
33 | ||
34 | #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ | |
35 | { \ | |
36 | .attr = { .name = __stringify(_name), .mode = _mode }, \ | |
37 | .show = _show, \ | |
38 | .store = _store, \ | |
39 | } | |
40 | ||
41 | #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ | |
42 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
43 | __INIT_KOBJ_ATTR(_name, 0644, _show, _store) | |
44 | ||
45 | #define BTRFS_ATTR(_prefix, _name, _show) \ | |
46 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
47 | __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) | |
48 | ||
49 | #define BTRFS_ATTR_PTR(_prefix, _name) \ | |
50 | (&btrfs_attr_##_prefix##_##_name.attr) | |
51 | ||
52 | #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ | |
53 | static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ | |
54 | .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ | |
55 | btrfs_feature_attr_show, \ | |
56 | btrfs_feature_attr_store), \ | |
57 | .feature_set = _feature_set, \ | |
58 | .feature_bit = _feature_prefix ##_## _feature_bit, \ | |
59 | } | |
60 | #define BTRFS_FEAT_ATTR_PTR(_name) \ | |
61 | (&btrfs_attr_features_##_name.kobj_attr.attr) | |
62 | ||
63 | #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ | |
64 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) | |
65 | #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ | |
66 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) | |
67 | #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ | |
68 | BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) | |
69 | ||
510d7360 | 70 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
2e7910d6 | 71 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
5ac1d209 | 72 | |
8f52316c DS |
73 | static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) |
74 | { | |
75 | return container_of(a, struct btrfs_feature_attr, kobj_attr); | |
76 | } | |
77 | ||
78 | static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) | |
79 | { | |
80 | return container_of(attr, struct kobj_attribute, attr); | |
81 | } | |
82 | ||
83 | static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( | |
84 | struct attribute *attr) | |
85 | { | |
86 | return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); | |
87 | } | |
88 | ||
510d7360 JM |
89 | static u64 get_features(struct btrfs_fs_info *fs_info, |
90 | enum btrfs_feature_set set) | |
5ac1d209 | 91 | { |
510d7360 JM |
92 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
93 | if (set == FEAT_COMPAT) | |
94 | return btrfs_super_compat_flags(disk_super); | |
95 | else if (set == FEAT_COMPAT_RO) | |
96 | return btrfs_super_compat_ro_flags(disk_super); | |
97 | else | |
98 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
99 | } |
100 | ||
ba631941 JM |
101 | static void set_features(struct btrfs_fs_info *fs_info, |
102 | enum btrfs_feature_set set, u64 features) | |
103 | { | |
104 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
105 | if (set == FEAT_COMPAT) | |
106 | btrfs_set_super_compat_flags(disk_super, features); | |
107 | else if (set == FEAT_COMPAT_RO) | |
108 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
109 | else | |
110 | btrfs_set_super_incompat_flags(disk_super, features); | |
111 | } | |
112 | ||
113 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
114 | { | |
115 | int val = 0; | |
116 | u64 set, clear; | |
117 | switch (fa->feature_set) { | |
118 | case FEAT_COMPAT: | |
119 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
120 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
121 | break; | |
122 | case FEAT_COMPAT_RO: | |
123 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
124 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
125 | break; | |
126 | case FEAT_INCOMPAT: | |
127 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
128 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
129 | break; | |
130 | default: | |
62e85577 | 131 | pr_warn("btrfs: sysfs: unknown feature set %d\n", |
cc37bb04 DS |
132 | fa->feature_set); |
133 | return 0; | |
ba631941 JM |
134 | } |
135 | ||
136 | if (set & fa->feature_bit) | |
137 | val |= 1; | |
138 | if (clear & fa->feature_bit) | |
139 | val |= 2; | |
140 | ||
141 | return val; | |
142 | } | |
143 | ||
510d7360 JM |
144 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
145 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 146 | { |
510d7360 | 147 | int val = 0; |
5ac1d209 | 148 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 149 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 150 | if (fs_info) { |
510d7360 JM |
151 | u64 features = get_features(fs_info, fa->feature_set); |
152 | if (features & fa->feature_bit) | |
153 | val = 1; | |
ba631941 JM |
154 | } else |
155 | val = can_modify_feature(fa); | |
510d7360 JM |
156 | |
157 | return snprintf(buf, PAGE_SIZE, "%d\n", val); | |
5ac1d209 JM |
158 | } |
159 | ||
ba631941 JM |
160 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
161 | struct kobj_attribute *a, | |
162 | const char *buf, size_t count) | |
163 | { | |
164 | struct btrfs_fs_info *fs_info; | |
165 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
ba631941 JM |
166 | u64 features, set, clear; |
167 | unsigned long val; | |
168 | int ret; | |
169 | ||
170 | fs_info = to_fs_info(kobj); | |
171 | if (!fs_info) | |
172 | return -EPERM; | |
173 | ||
bc98a42c | 174 | if (sb_rdonly(fs_info->sb)) |
ee611138 DS |
175 | return -EROFS; |
176 | ||
ba631941 JM |
177 | ret = kstrtoul(skip_spaces(buf), 0, &val); |
178 | if (ret) | |
179 | return ret; | |
180 | ||
181 | if (fa->feature_set == FEAT_COMPAT) { | |
182 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
183 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
184 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
185 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
186 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
187 | } else { | |
188 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
189 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
190 | } | |
191 | ||
192 | features = get_features(fs_info, fa->feature_set); | |
193 | ||
194 | /* Nothing to do */ | |
195 | if ((val && (features & fa->feature_bit)) || | |
196 | (!val && !(features & fa->feature_bit))) | |
197 | return count; | |
198 | ||
199 | if ((val && !(set & fa->feature_bit)) || | |
200 | (!val && !(clear & fa->feature_bit))) { | |
201 | btrfs_info(fs_info, | |
202 | "%sabling feature %s on mounted fs is not supported.", | |
203 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
204 | return -EPERM; | |
205 | } | |
206 | ||
207 | btrfs_info(fs_info, "%s %s feature flag", | |
208 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
209 | ||
ba631941 JM |
210 | spin_lock(&fs_info->super_lock); |
211 | features = get_features(fs_info, fa->feature_set); | |
212 | if (val) | |
213 | features |= fa->feature_bit; | |
214 | else | |
215 | features &= ~fa->feature_bit; | |
216 | set_features(fs_info, fa->feature_set, features); | |
217 | spin_unlock(&fs_info->super_lock); | |
218 | ||
0eae2747 DS |
219 | /* |
220 | * We don't want to do full transaction commit from inside sysfs | |
221 | */ | |
222 | btrfs_set_pending(fs_info, COMMIT); | |
223 | wake_up_process(fs_info->transaction_kthread); | |
ba631941 JM |
224 | |
225 | return count; | |
226 | } | |
227 | ||
510d7360 JM |
228 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
229 | struct attribute *attr, int unused) | |
079b72bc | 230 | { |
510d7360 JM |
231 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
232 | umode_t mode = attr->mode; | |
233 | ||
234 | if (fs_info) { | |
235 | struct btrfs_feature_attr *fa; | |
236 | u64 features; | |
237 | ||
238 | fa = attr_to_btrfs_feature_attr(attr); | |
239 | features = get_features(fs_info, fa->feature_set); | |
240 | ||
ba631941 JM |
241 | if (can_modify_feature(fa)) |
242 | mode |= S_IWUSR; | |
243 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
244 | mode = 0; |
245 | } | |
246 | ||
247 | return mode; | |
079b72bc JM |
248 | } |
249 | ||
250 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
251 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
252 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
253 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
5c1aab1d | 254 | BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); |
079b72bc JM |
255 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
256 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
257 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
258 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 259 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
56f20f40 | 260 | BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); |
3b5bb73b | 261 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
cfbb825c | 262 | BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); |
079b72bc JM |
263 | |
264 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
265 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
266 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
267 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
268 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
5c1aab1d | 269 | BTRFS_FEAT_ATTR_PTR(compress_zstd), |
079b72bc JM |
270 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
271 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
272 | BTRFS_FEAT_ATTR_PTR(raid56), | |
273 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 274 | BTRFS_FEAT_ATTR_PTR(no_holes), |
56f20f40 | 275 | BTRFS_FEAT_ATTR_PTR(metadata_uuid), |
3b5bb73b | 276 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
cfbb825c | 277 | BTRFS_FEAT_ATTR_PTR(raid1c34), |
079b72bc JM |
278 | NULL |
279 | }; | |
280 | ||
f902bd3a MT |
281 | /* |
282 | * Features which depend on feature bits and may differ between each fs. | |
283 | * | |
284 | * /sys/fs/btrfs/features lists all available features of this kernel while | |
285 | * /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or | |
286 | * can be changed online. | |
287 | */ | |
079b72bc JM |
288 | static const struct attribute_group btrfs_feature_attr_group = { |
289 | .name = "features", | |
510d7360 | 290 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
291 | .attrs = btrfs_supported_feature_attrs, |
292 | }; | |
58176a96 | 293 | |
f902bd3a MT |
294 | static ssize_t rmdir_subvol_show(struct kobject *kobj, |
295 | struct kobj_attribute *ka, char *buf) | |
296 | { | |
297 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
298 | } | |
299 | BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); | |
300 | ||
f7cea56c DS |
301 | static ssize_t supported_checksums_show(struct kobject *kobj, |
302 | struct kobj_attribute *a, char *buf) | |
303 | { | |
304 | ssize_t ret = 0; | |
305 | int i; | |
306 | ||
307 | for (i = 0; i < btrfs_get_num_csums(); i++) { | |
308 | /* | |
309 | * This "trick" only works as long as 'enum btrfs_csum_type' has | |
310 | * no holes in it | |
311 | */ | |
312 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s", | |
313 | (i == 0 ? "" : " "), btrfs_super_csum_name(i)); | |
314 | ||
315 | } | |
316 | ||
317 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); | |
318 | return ret; | |
319 | } | |
320 | BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); | |
321 | ||
f902bd3a MT |
322 | static struct attribute *btrfs_supported_static_feature_attrs[] = { |
323 | BTRFS_ATTR_PTR(static_feature, rmdir_subvol), | |
f7cea56c | 324 | BTRFS_ATTR_PTR(static_feature, supported_checksums), |
f902bd3a MT |
325 | NULL |
326 | }; | |
327 | ||
328 | /* | |
329 | * Features which only depend on kernel version. | |
330 | * | |
331 | * These are listed in /sys/fs/btrfs/features along with | |
332 | * btrfs_feature_attr_group | |
333 | */ | |
334 | static const struct attribute_group btrfs_static_feature_attr_group = { | |
335 | .name = "features", | |
336 | .attrs = btrfs_supported_static_feature_attrs, | |
337 | }; | |
338 | ||
6e369feb DS |
339 | #ifdef CONFIG_BTRFS_DEBUG |
340 | ||
341 | /* | |
342 | * Runtime debugging exported via sysfs | |
343 | * | |
344 | * /sys/fs/btrfs/debug - applies to module or all filesystems | |
345 | * /sys/fs/btrfs/UUID - applies only to the given filesystem | |
346 | */ | |
347 | static struct attribute *btrfs_debug_feature_attrs[] = { | |
348 | NULL | |
349 | }; | |
350 | ||
351 | static const struct attribute_group btrfs_debug_feature_attr_group = { | |
352 | .name = "debug", | |
353 | .attrs = btrfs_debug_feature_attrs, | |
354 | }; | |
355 | ||
356 | #endif | |
357 | ||
6ab0a202 JM |
358 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
359 | { | |
360 | u64 val; | |
361 | if (lock) | |
362 | spin_lock(lock); | |
363 | val = *value_ptr; | |
364 | if (lock) | |
365 | spin_unlock(lock); | |
366 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
367 | } | |
368 | ||
369 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
370 | struct kobj_attribute *ka, char *buf) | |
371 | { | |
372 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
373 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
374 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
375 | } | |
a969f4cc | 376 | BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
377 | |
378 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
379 | struct kobj_attribute *a, char *buf) | |
380 | { | |
381 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
382 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
383 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
384 | } | |
a969f4cc | 385 | BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
386 | |
387 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 388 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
389 | |
390 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
391 | struct kobj_attribute *attr, char *buf); | |
a969f4cc HK |
392 | BTRFS_ATTR(raid, total_bytes, raid_bytes_show); |
393 | BTRFS_ATTR(raid, used_bytes, raid_bytes_show); | |
6ab0a202 JM |
394 | |
395 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
396 | struct kobj_attribute *attr, char *buf) | |
397 | ||
398 | { | |
399 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
32da5386 | 400 | struct btrfs_block_group *block_group; |
75cb379d | 401 | int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); |
6ab0a202 JM |
402 | u64 val = 0; |
403 | ||
404 | down_read(&sinfo->groups_sem); | |
405 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
a969f4cc | 406 | if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) |
b3470b5d | 407 | val += block_group->length; |
6ab0a202 | 408 | else |
bf38be65 | 409 | val += block_group->used; |
6ab0a202 JM |
410 | } |
411 | up_read(&sinfo->groups_sem); | |
412 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
413 | } | |
414 | ||
7c7e3014 | 415 | static struct attribute *raid_attrs[] = { |
a969f4cc HK |
416 | BTRFS_ATTR_PTR(raid, total_bytes), |
417 | BTRFS_ATTR_PTR(raid, used_bytes), | |
6ab0a202 JM |
418 | NULL |
419 | }; | |
7c7e3014 | 420 | ATTRIBUTE_GROUPS(raid); |
6ab0a202 JM |
421 | |
422 | static void release_raid_kobj(struct kobject *kobj) | |
423 | { | |
c1895442 | 424 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
425 | } |
426 | ||
536ea45c | 427 | static struct kobj_type btrfs_raid_ktype = { |
6ab0a202 JM |
428 | .sysfs_ops = &kobj_sysfs_ops, |
429 | .release = release_raid_kobj, | |
7c7e3014 | 430 | .default_groups = raid_groups, |
6ab0a202 JM |
431 | }; |
432 | ||
433 | #define SPACE_INFO_ATTR(field) \ | |
434 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
435 | struct kobj_attribute *a, \ | |
436 | char *buf) \ | |
437 | { \ | |
438 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
439 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
440 | } \ | |
a969f4cc | 441 | BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) |
6ab0a202 JM |
442 | |
443 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
444 | struct kobj_attribute *a, | |
445 | char *buf) | |
446 | { | |
447 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
448 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
449 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
450 | } | |
451 | ||
452 | SPACE_INFO_ATTR(flags); | |
453 | SPACE_INFO_ATTR(total_bytes); | |
454 | SPACE_INFO_ATTR(bytes_used); | |
455 | SPACE_INFO_ATTR(bytes_pinned); | |
456 | SPACE_INFO_ATTR(bytes_reserved); | |
457 | SPACE_INFO_ATTR(bytes_may_use); | |
c1fd5c30 | 458 | SPACE_INFO_ATTR(bytes_readonly); |
6ab0a202 JM |
459 | SPACE_INFO_ATTR(disk_used); |
460 | SPACE_INFO_ATTR(disk_total); | |
a969f4cc HK |
461 | BTRFS_ATTR(space_info, total_bytes_pinned, |
462 | btrfs_space_info_show_total_bytes_pinned); | |
6ab0a202 JM |
463 | |
464 | static struct attribute *space_info_attrs[] = { | |
a969f4cc HK |
465 | BTRFS_ATTR_PTR(space_info, flags), |
466 | BTRFS_ATTR_PTR(space_info, total_bytes), | |
467 | BTRFS_ATTR_PTR(space_info, bytes_used), | |
468 | BTRFS_ATTR_PTR(space_info, bytes_pinned), | |
469 | BTRFS_ATTR_PTR(space_info, bytes_reserved), | |
470 | BTRFS_ATTR_PTR(space_info, bytes_may_use), | |
471 | BTRFS_ATTR_PTR(space_info, bytes_readonly), | |
472 | BTRFS_ATTR_PTR(space_info, disk_used), | |
473 | BTRFS_ATTR_PTR(space_info, disk_total), | |
474 | BTRFS_ATTR_PTR(space_info, total_bytes_pinned), | |
6ab0a202 JM |
475 | NULL, |
476 | }; | |
7c7e3014 | 477 | ATTRIBUTE_GROUPS(space_info); |
6ab0a202 JM |
478 | |
479 | static void space_info_release(struct kobject *kobj) | |
480 | { | |
481 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
482 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
483 | kfree(sinfo); | |
484 | } | |
485 | ||
27992d01 | 486 | static struct kobj_type space_info_ktype = { |
6ab0a202 JM |
487 | .sysfs_ops = &kobj_sysfs_ops, |
488 | .release = space_info_release, | |
7c7e3014 | 489 | .default_groups = space_info_groups, |
6ab0a202 JM |
490 | }; |
491 | ||
492 | static const struct attribute *allocation_attrs[] = { | |
a969f4cc HK |
493 | BTRFS_ATTR_PTR(allocation, global_rsv_reserved), |
494 | BTRFS_ATTR_PTR(allocation, global_rsv_size), | |
6ab0a202 JM |
495 | NULL, |
496 | }; | |
497 | ||
f8ba9c11 JM |
498 | static ssize_t btrfs_label_show(struct kobject *kobj, |
499 | struct kobj_attribute *a, char *buf) | |
500 | { | |
501 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 502 | char *label = fs_info->super_copy->label; |
ee17fc80 DS |
503 | ssize_t ret; |
504 | ||
505 | spin_lock(&fs_info->super_lock); | |
506 | ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); | |
507 | spin_unlock(&fs_info->super_lock); | |
508 | ||
509 | return ret; | |
f8ba9c11 JM |
510 | } |
511 | ||
512 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
513 | struct kobj_attribute *a, | |
514 | const char *buf, size_t len) | |
515 | { | |
516 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 517 | size_t p_len; |
f8ba9c11 | 518 | |
66ac9fe7 DS |
519 | if (!fs_info) |
520 | return -EPERM; | |
521 | ||
bc98a42c | 522 | if (sb_rdonly(fs_info->sb)) |
79aec2b8 AJ |
523 | return -EROFS; |
524 | ||
48fcc3ff ST |
525 | /* |
526 | * p_len is the len until the first occurrence of either | |
527 | * '\n' or '\0' | |
528 | */ | |
529 | p_len = strcspn(buf, "\n"); | |
530 | ||
531 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 532 | return -EINVAL; |
f8ba9c11 | 533 | |
a6f69dc8 | 534 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
535 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
536 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 537 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 538 | |
a6f69dc8 DS |
539 | /* |
540 | * We don't want to do full transaction commit from inside sysfs | |
541 | */ | |
542 | btrfs_set_pending(fs_info, COMMIT); | |
543 | wake_up_process(fs_info->transaction_kthread); | |
f8ba9c11 | 544 | |
a6f69dc8 | 545 | return len; |
f8ba9c11 | 546 | } |
a969f4cc | 547 | BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 548 | |
df93589a DS |
549 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
550 | struct kobj_attribute *a, char *buf) | |
551 | { | |
552 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
553 | ||
093e037c | 554 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); |
df93589a DS |
555 | } |
556 | ||
a969f4cc | 557 | BTRFS_ATTR(, nodesize, btrfs_nodesize_show); |
df93589a DS |
558 | |
559 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
560 | struct kobj_attribute *a, char *buf) | |
561 | { | |
562 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
563 | ||
093e037c DS |
564 | return snprintf(buf, PAGE_SIZE, "%u\n", |
565 | fs_info->super_copy->sectorsize); | |
df93589a DS |
566 | } |
567 | ||
a969f4cc | 568 | BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); |
df93589a DS |
569 | |
570 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
571 | struct kobj_attribute *a, char *buf) | |
572 | { | |
573 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
574 | ||
093e037c DS |
575 | return snprintf(buf, PAGE_SIZE, "%u\n", |
576 | fs_info->super_copy->sectorsize); | |
df93589a DS |
577 | } |
578 | ||
a969f4cc | 579 | BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); |
df93589a | 580 | |
2723480a SD |
581 | static ssize_t quota_override_show(struct kobject *kobj, |
582 | struct kobj_attribute *a, char *buf) | |
583 | { | |
584 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
585 | int quota_override; | |
586 | ||
587 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
588 | return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); | |
589 | } | |
590 | ||
591 | static ssize_t quota_override_store(struct kobject *kobj, | |
592 | struct kobj_attribute *a, | |
593 | const char *buf, size_t len) | |
594 | { | |
595 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
596 | unsigned long knob; | |
597 | int err; | |
598 | ||
599 | if (!fs_info) | |
600 | return -EPERM; | |
601 | ||
602 | if (!capable(CAP_SYS_RESOURCE)) | |
603 | return -EPERM; | |
604 | ||
605 | err = kstrtoul(buf, 10, &knob); | |
606 | if (err) | |
607 | return err; | |
608 | if (knob > 1) | |
609 | return -EINVAL; | |
610 | ||
611 | if (knob) | |
612 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
613 | else | |
614 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
615 | ||
616 | return len; | |
617 | } | |
618 | ||
a969f4cc | 619 | BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); |
2723480a | 620 | |
56f20f40 NB |
621 | static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, |
622 | struct kobj_attribute *a, char *buf) | |
623 | { | |
624 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
625 | ||
626 | return snprintf(buf, PAGE_SIZE, "%pU\n", | |
627 | fs_info->fs_devices->metadata_uuid); | |
628 | } | |
629 | ||
630 | BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); | |
631 | ||
41e6d2a8 JT |
632 | static ssize_t btrfs_checksum_show(struct kobject *kobj, |
633 | struct kobj_attribute *a, char *buf) | |
634 | { | |
635 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
636 | u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
637 | ||
638 | return snprintf(buf, PAGE_SIZE, "%s (%s)\n", | |
639 | btrfs_super_csum_name(csum_type), | |
640 | crypto_shash_driver_name(fs_info->csum_shash)); | |
641 | } | |
642 | ||
643 | BTRFS_ATTR(, checksum, btrfs_checksum_show); | |
644 | ||
0dd2906f | 645 | static const struct attribute *btrfs_attrs[] = { |
a969f4cc HK |
646 | BTRFS_ATTR_PTR(, label), |
647 | BTRFS_ATTR_PTR(, nodesize), | |
648 | BTRFS_ATTR_PTR(, sectorsize), | |
649 | BTRFS_ATTR_PTR(, clone_alignment), | |
650 | BTRFS_ATTR_PTR(, quota_override), | |
56f20f40 | 651 | BTRFS_ATTR_PTR(, metadata_uuid), |
41e6d2a8 | 652 | BTRFS_ATTR_PTR(, checksum), |
f8ba9c11 JM |
653 | NULL, |
654 | }; | |
655 | ||
c1b7e474 | 656 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
510d7360 | 657 | { |
2e7910d6 | 658 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
248d200d | 659 | |
c1b7e474 | 660 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
2e7910d6 | 661 | complete(&fs_devs->kobj_unregister); |
510d7360 JM |
662 | } |
663 | ||
664 | static struct kobj_type btrfs_ktype = { | |
665 | .sysfs_ops = &kobj_sysfs_ops, | |
c1b7e474 | 666 | .release = btrfs_release_fsid_kobj, |
510d7360 JM |
667 | }; |
668 | ||
2e7910d6 AJ |
669 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
670 | { | |
671 | if (kobj->ktype != &btrfs_ktype) | |
672 | return NULL; | |
c1b7e474 | 673 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
2e7910d6 AJ |
674 | } |
675 | ||
510d7360 JM |
676 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
677 | { | |
678 | if (kobj->ktype != &btrfs_ktype) | |
679 | return NULL; | |
2e7910d6 | 680 | return to_fs_devs(kobj)->fs_info; |
510d7360 | 681 | } |
58176a96 | 682 | |
e453d989 | 683 | #define NUM_FEATURE_BITS 64 |
6c52157f TM |
684 | #define BTRFS_FEATURE_NAME_MAX 13 |
685 | static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; | |
686 | static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; | |
e453d989 | 687 | |
6c52157f | 688 | static const u64 supported_feature_masks[FEAT_MAX] = { |
e453d989 JM |
689 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
690 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
691 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
692 | }; | |
693 | ||
694 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
695 | { | |
696 | int set; | |
697 | ||
698 | for (set = 0; set < FEAT_MAX; set++) { | |
699 | int i; | |
700 | struct attribute *attrs[2]; | |
701 | struct attribute_group agroup = { | |
702 | .name = "features", | |
703 | .attrs = attrs, | |
704 | }; | |
705 | u64 features = get_features(fs_info, set); | |
706 | features &= ~supported_feature_masks[set]; | |
707 | ||
708 | if (!features) | |
709 | continue; | |
710 | ||
711 | attrs[1] = NULL; | |
712 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
713 | struct btrfs_feature_attr *fa; | |
714 | ||
715 | if (!(features & (1ULL << i))) | |
716 | continue; | |
717 | ||
718 | fa = &btrfs_feature_attrs[set][i]; | |
719 | attrs[0] = &fa->kobj_attr.attr; | |
720 | if (add) { | |
721 | int ret; | |
c1b7e474 | 722 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
723 | &agroup); |
724 | if (ret) | |
725 | return ret; | |
726 | } else | |
c1b7e474 | 727 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
728 | &agroup); |
729 | } | |
730 | ||
731 | } | |
732 | return 0; | |
733 | } | |
734 | ||
2e3e1281 | 735 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 | 736 | { |
b5501504 AJ |
737 | if (fs_devs->devices_kobj) { |
738 | kobject_del(fs_devs->devices_kobj); | |
739 | kobject_put(fs_devs->devices_kobj); | |
740 | fs_devs->devices_kobj = NULL; | |
aaf13305 AJ |
741 | } |
742 | ||
c1b7e474 AJ |
743 | if (fs_devs->fsid_kobj.state_initialized) { |
744 | kobject_del(&fs_devs->fsid_kobj); | |
745 | kobject_put(&fs_devs->fsid_kobj); | |
f90fc547 AJ |
746 | wait_for_completion(&fs_devs->kobj_unregister); |
747 | } | |
5ac1d209 JM |
748 | } |
749 | ||
2e3e1281 | 750 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1d1c1be3 | 751 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
2e3e1281 AJ |
752 | { |
753 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
754 | ||
755 | if (fs_devs) { | |
756 | __btrfs_sysfs_remove_fsid(fs_devs); | |
757 | return; | |
758 | } | |
759 | ||
c4babc5e | 760 | list_for_each_entry(fs_devs, fs_uuids, fs_list) { |
2e3e1281 AJ |
761 | __btrfs_sysfs_remove_fsid(fs_devs); |
762 | } | |
763 | } | |
764 | ||
6618a59b | 765 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
e453d989 | 766 | { |
5a13f430 AJ |
767 | btrfs_reset_fs_info_ptr(fs_info); |
768 | ||
e453d989 JM |
769 | if (fs_info->space_info_kobj) { |
770 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
771 | kobject_del(fs_info->space_info_kobj); | |
772 | kobject_put(fs_info->space_info_kobj); | |
773 | } | |
e453d989 | 774 | addrm_unknown_feature_attrs(fs_info, false); |
c1b7e474 AJ |
775 | sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); |
776 | sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); | |
32576040 | 777 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); |
e453d989 JM |
778 | } |
779 | ||
f10152bc | 780 | static const char * const btrfs_feature_set_names[FEAT_MAX] = { |
79da4fa4 JM |
781 | [FEAT_COMPAT] = "compat", |
782 | [FEAT_COMPAT_RO] = "compat_ro", | |
783 | [FEAT_INCOMPAT] = "incompat", | |
784 | }; | |
785 | ||
f10152bc DS |
786 | const char * const btrfs_feature_set_name(enum btrfs_feature_set set) |
787 | { | |
788 | return btrfs_feature_set_names[set]; | |
789 | } | |
790 | ||
3b02a68a JM |
791 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
792 | { | |
793 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
794 | int len = 0; | |
795 | int i; | |
796 | char *str; | |
797 | ||
798 | str = kmalloc(bufsize, GFP_KERNEL); | |
799 | if (!str) | |
800 | return str; | |
801 | ||
802 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
803 | const char *name; | |
804 | ||
805 | if (!(flags & (1ULL << i))) | |
806 | continue; | |
807 | ||
808 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
809 | len += snprintf(str + len, bufsize - len, "%s%s", | |
810 | len ? "," : "", name); | |
811 | } | |
812 | ||
813 | return str; | |
814 | } | |
815 | ||
79da4fa4 JM |
816 | static void init_feature_attrs(void) |
817 | { | |
818 | struct btrfs_feature_attr *fa; | |
819 | int set, i; | |
820 | ||
821 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
822 | ARRAY_SIZE(btrfs_feature_attrs)); | |
823 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
824 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
825 | ||
3b02a68a JM |
826 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
827 | memset(btrfs_unknown_feature_names, 0, | |
828 | sizeof(btrfs_unknown_feature_names)); | |
829 | ||
79da4fa4 JM |
830 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
831 | struct btrfs_feature_attr *sfa; | |
832 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 833 | int bit; |
79da4fa4 | 834 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
835 | bit = ilog2(sfa->feature_bit); |
836 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
837 | |
838 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
839 | } | |
840 | ||
841 | for (set = 0; set < FEAT_MAX; set++) { | |
842 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
843 | char *name = btrfs_unknown_feature_names[set][i]; | |
844 | fa = &btrfs_feature_attrs[set][i]; | |
845 | ||
846 | if (fa->kobj_attr.attr.name) | |
847 | continue; | |
848 | ||
6c52157f | 849 | snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", |
79da4fa4 JM |
850 | btrfs_feature_set_names[set], i); |
851 | ||
852 | fa->kobj_attr.attr.name = name; | |
853 | fa->kobj_attr.attr.mode = S_IRUGO; | |
854 | fa->feature_set = set; | |
855 | fa->feature_bit = 1ULL << i; | |
856 | } | |
857 | } | |
858 | } | |
859 | ||
32a9991f DS |
860 | /* |
861 | * Create a sysfs entry for a given block group type at path | |
862 | * /sys/fs/btrfs/UUID/allocation/data/TYPE | |
863 | */ | |
32da5386 | 864 | void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) |
32a9991f DS |
865 | { |
866 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
867 | struct btrfs_space_info *space_info = cache->space_info; | |
868 | struct raid_kobject *rkobj; | |
869 | const int index = btrfs_bg_flags_to_raid_index(cache->flags); | |
870 | unsigned int nofs_flag; | |
871 | int ret; | |
872 | ||
873 | /* | |
874 | * Setup a NOFS context because kobject_add(), deep in its call chain, | |
875 | * does GFP_KERNEL allocations, and we are often called in a context | |
876 | * where if reclaim is triggered we can deadlock (we are either holding | |
877 | * a transaction handle or some lock required for a transaction | |
878 | * commit). | |
879 | */ | |
880 | nofs_flag = memalloc_nofs_save(); | |
881 | ||
882 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); | |
883 | if (!rkobj) { | |
884 | memalloc_nofs_restore(nofs_flag); | |
885 | btrfs_warn(cache->fs_info, | |
886 | "couldn't alloc memory for raid level kobject"); | |
887 | return; | |
888 | } | |
889 | ||
890 | rkobj->flags = cache->flags; | |
891 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
892 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", | |
893 | btrfs_bg_type_to_raid_name(rkobj->flags)); | |
894 | memalloc_nofs_restore(nofs_flag); | |
895 | if (ret) { | |
896 | kobject_put(&rkobj->kobj); | |
897 | btrfs_warn(fs_info, | |
898 | "failed to add kobject for block cache, ignoring"); | |
899 | return; | |
900 | } | |
901 | ||
902 | space_info->block_group_kobjs[index] = &rkobj->kobj; | |
903 | } | |
904 | ||
b5865bab DS |
905 | /* |
906 | * Remove sysfs directories for all block group types of a given space info and | |
907 | * the space info as well | |
908 | */ | |
909 | void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) | |
910 | { | |
911 | int i; | |
912 | ||
913 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
914 | struct kobject *kobj; | |
915 | ||
916 | kobj = space_info->block_group_kobjs[i]; | |
917 | space_info->block_group_kobjs[i] = NULL; | |
918 | if (kobj) { | |
919 | kobject_del(kobj); | |
920 | kobject_put(kobj); | |
921 | } | |
922 | } | |
923 | kobject_del(&space_info->kobj); | |
924 | kobject_put(&space_info->kobj); | |
925 | } | |
926 | ||
b882327a DS |
927 | static const char *alloc_name(u64 flags) |
928 | { | |
929 | switch (flags) { | |
930 | case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: | |
931 | return "mixed"; | |
932 | case BTRFS_BLOCK_GROUP_METADATA: | |
933 | return "metadata"; | |
934 | case BTRFS_BLOCK_GROUP_DATA: | |
935 | return "data"; | |
936 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
937 | return "system"; | |
938 | default: | |
939 | WARN_ON(1); | |
940 | return "invalid-combination"; | |
941 | }; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Create a sysfs entry for a space info type at path | |
946 | * /sys/fs/btrfs/UUID/allocation/TYPE | |
947 | */ | |
948 | int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, | |
949 | struct btrfs_space_info *space_info) | |
950 | { | |
951 | int ret; | |
952 | ||
953 | ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, | |
954 | fs_info->space_info_kobj, "%s", | |
955 | alloc_name(space_info->flags)); | |
956 | if (ret) { | |
957 | kobject_put(&space_info->kobj); | |
958 | return ret; | |
959 | } | |
960 | ||
961 | return 0; | |
962 | } | |
963 | ||
e7e1aa9c AJ |
964 | /* when one_device is NULL, it removes all device links */ |
965 | ||
32576040 | 966 | int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, |
99994cde AJ |
967 | struct btrfs_device *one_device) |
968 | { | |
969 | struct hd_struct *disk; | |
970 | struct kobject *disk_kobj; | |
971 | ||
b5501504 | 972 | if (!fs_devices->devices_kobj) |
99994cde AJ |
973 | return -EINVAL; |
974 | ||
87fa3bb0 | 975 | if (one_device && one_device->bdev) { |
99994cde AJ |
976 | disk = one_device->bdev->bd_part; |
977 | disk_kobj = &part_to_dev(disk)->kobj; | |
978 | ||
b5501504 | 979 | sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name); |
99994cde AJ |
980 | } |
981 | ||
e7e1aa9c AJ |
982 | if (one_device) |
983 | return 0; | |
984 | ||
985 | list_for_each_entry(one_device, | |
6c14a164 | 986 | &fs_devices->devices, dev_list) { |
e7e1aa9c AJ |
987 | if (!one_device->bdev) |
988 | continue; | |
989 | disk = one_device->bdev->bd_part; | |
990 | disk_kobj = &part_to_dev(disk)->kobj; | |
991 | ||
b5501504 | 992 | sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name); |
e7e1aa9c AJ |
993 | } |
994 | ||
99994cde AJ |
995 | return 0; |
996 | } | |
997 | ||
e3bd6973 | 998 | int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, |
1ba43816 | 999 | struct btrfs_device *one_device) |
00c921c2 AJ |
1000 | { |
1001 | int error = 0; | |
00c921c2 AJ |
1002 | struct btrfs_device *dev; |
1003 | ||
29e5be24 | 1004 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
f085381e AJ |
1005 | struct hd_struct *disk; |
1006 | struct kobject *disk_kobj; | |
1007 | ||
1008 | if (!dev->bdev) | |
1009 | continue; | |
1010 | ||
0d39376a AJ |
1011 | if (one_device && one_device != dev) |
1012 | continue; | |
1013 | ||
f085381e AJ |
1014 | disk = dev->bdev->bd_part; |
1015 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 | 1016 | |
b5501504 | 1017 | error = sysfs_create_link(fs_devices->devices_kobj, |
29e5be24 JM |
1018 | disk_kobj, disk_kobj->name); |
1019 | if (error) | |
1020 | break; | |
1021 | } | |
1022 | ||
1023 | return error; | |
1024 | } | |
1025 | ||
5b28692e DS |
1026 | void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) |
1027 | { | |
1028 | int ret; | |
1029 | ||
1030 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
1031 | if (ret) | |
1032 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", | |
1033 | action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
1034 | &disk_to_dev(bdev->bd_disk)->kobj); | |
1035 | } | |
1036 | ||
f93c3997 DS |
1037 | void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices, |
1038 | const u8 *fsid) | |
1039 | { | |
1040 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
1041 | ||
1042 | /* | |
1043 | * Sprouting changes fsid of the mounted filesystem, rename the fsid | |
1044 | * directory | |
1045 | */ | |
1046 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fsid); | |
1047 | if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) | |
1048 | btrfs_warn(fs_devices->fs_info, | |
1049 | "sysfs: failed to create fsid for sprout"); | |
1050 | } | |
1051 | ||
510d7360 JM |
1052 | /* /sys/fs/btrfs/ entry */ |
1053 | static struct kset *btrfs_kset; | |
1054 | ||
72059215 | 1055 | /* |
c6761a9e AJ |
1056 | * Creates: |
1057 | * /sys/fs/btrfs/UUID | |
1058 | * | |
72059215 | 1059 | * Can be called by the device discovery thread. |
72059215 | 1060 | */ |
c6761a9e | 1061 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 JM |
1062 | { |
1063 | int error; | |
1064 | ||
2e7910d6 | 1065 | init_completion(&fs_devs->kobj_unregister); |
c1b7e474 | 1066 | fs_devs->fsid_kobj.kset = btrfs_kset; |
c6761a9e AJ |
1067 | error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, |
1068 | "%pU", fs_devs->fsid); | |
e3277335 TH |
1069 | if (error) { |
1070 | kobject_put(&fs_devs->fsid_kobj); | |
1071 | return error; | |
1072 | } | |
1073 | ||
bc036bb3 AJ |
1074 | fs_devs->devices_kobj = kobject_create_and_add("devices", |
1075 | &fs_devs->fsid_kobj); | |
1076 | if (!fs_devs->devices_kobj) { | |
1077 | btrfs_err(fs_devs->fs_info, | |
1078 | "failed to init sysfs device interface"); | |
1079 | kobject_put(&fs_devs->fsid_kobj); | |
1080 | return -ENOMEM; | |
1081 | } | |
1082 | ||
e3277335 | 1083 | return 0; |
72059215 AJ |
1084 | } |
1085 | ||
96f3136e | 1086 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
72059215 AJ |
1087 | { |
1088 | int error; | |
2e7910d6 | 1089 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e474 | 1090 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
72059215 | 1091 | |
5a13f430 AJ |
1092 | btrfs_set_fs_info_ptr(fs_info); |
1093 | ||
e3bd6973 | 1094 | error = btrfs_sysfs_add_device_link(fs_devs, NULL); |
b7c35e81 | 1095 | if (error) |
aaf13305 | 1096 | return error; |
aaf13305 | 1097 | |
c1b7e474 | 1098 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989 | 1099 | if (error) { |
32576040 | 1100 | btrfs_sysfs_rm_device_link(fs_devs, NULL); |
e453d989 JM |
1101 | return error; |
1102 | } | |
79da4fa4 | 1103 | |
c1b7e474 | 1104 | error = sysfs_create_group(fsid_kobj, |
0dd2906f AJ |
1105 | &btrfs_feature_attr_group); |
1106 | if (error) | |
1107 | goto failure; | |
1108 | ||
6e369feb DS |
1109 | #ifdef CONFIG_BTRFS_DEBUG |
1110 | error = sysfs_create_group(fsid_kobj, | |
1111 | &btrfs_debug_feature_attr_group); | |
1112 | if (error) | |
1113 | goto failure; | |
1114 | #endif | |
1115 | ||
e453d989 | 1116 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
1117 | if (error) |
1118 | goto failure; | |
1119 | ||
6ab0a202 | 1120 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e474 | 1121 | fsid_kobj); |
6ab0a202 JM |
1122 | if (!fs_info->space_info_kobj) { |
1123 | error = -ENOMEM; | |
1124 | goto failure; | |
1125 | } | |
1126 | ||
1127 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
1128 | if (error) | |
1129 | goto failure; | |
1130 | ||
79da4fa4 JM |
1131 | return 0; |
1132 | failure: | |
6618a59b | 1133 | btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209 JM |
1134 | return error; |
1135 | } | |
1136 | ||
444e7516 DS |
1137 | |
1138 | /* | |
1139 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
1140 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
1141 | */ | |
1142 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, | |
1143 | u64 bit, enum btrfs_feature_set set) | |
1144 | { | |
1145 | struct btrfs_fs_devices *fs_devs; | |
1146 | struct kobject *fsid_kobj; | |
1147 | u64 features; | |
1148 | int ret; | |
1149 | ||
1150 | if (!fs_info) | |
1151 | return; | |
1152 | ||
1153 | features = get_features(fs_info, set); | |
1154 | ASSERT(bit & supported_feature_masks[set]); | |
1155 | ||
1156 | fs_devs = fs_info->fs_devices; | |
1157 | fsid_kobj = &fs_devs->fsid_kobj; | |
1158 | ||
bf609206 DS |
1159 | if (!fsid_kobj->state_initialized) |
1160 | return; | |
1161 | ||
444e7516 DS |
1162 | /* |
1163 | * FIXME: this is too heavy to update just one value, ideally we'd like | |
1164 | * to use sysfs_update_group but some refactoring is needed first. | |
1165 | */ | |
1166 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); | |
1167 | ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); | |
1168 | } | |
1169 | ||
f5c29bd9 | 1170 | int __init btrfs_init_sysfs(void) |
58176a96 | 1171 | { |
079b72bc | 1172 | int ret; |
1bae3098 | 1173 | |
e3fe4e71 GKH |
1174 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
1175 | if (!btrfs_kset) | |
1176 | return -ENOMEM; | |
079b72bc | 1177 | |
1bae3098 | 1178 | init_feature_attrs(); |
079b72bc | 1179 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
1180 | if (ret) |
1181 | goto out2; | |
f902bd3a MT |
1182 | ret = sysfs_merge_group(&btrfs_kset->kobj, |
1183 | &btrfs_static_feature_attr_group); | |
1184 | if (ret) | |
1185 | goto out_remove_group; | |
001a648d | 1186 | |
6e369feb DS |
1187 | #ifdef CONFIG_BTRFS_DEBUG |
1188 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
1189 | if (ret) | |
1190 | goto out2; | |
1191 | #endif | |
1192 | ||
001a648d | 1193 | return 0; |
f902bd3a MT |
1194 | |
1195 | out_remove_group: | |
1196 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); | |
001a648d | 1197 | out2: |
001a648d | 1198 | kset_unregister(btrfs_kset); |
079b72bc | 1199 | |
1bae3098 | 1200 | return ret; |
58176a96 JB |
1201 | } |
1202 | ||
e67c718b | 1203 | void __cold btrfs_exit_sysfs(void) |
58176a96 | 1204 | { |
f902bd3a MT |
1205 | sysfs_unmerge_group(&btrfs_kset->kobj, |
1206 | &btrfs_static_feature_attr_group); | |
079b72bc | 1207 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 1208 | kset_unregister(btrfs_kset); |
58176a96 | 1209 | } |
55d47414 | 1210 |