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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 JB |
6 | #include <linux/sched.h> |
7 | #include <linux/slab.h> | |
8 | #include <linux/spinlock.h> | |
9 | #include <linux/completion.h> | |
10 | #include <linux/buffer_head.h> | |
58176a96 | 11 | #include <linux/kobject.h> |
79da4fa4 | 12 | #include <linux/bug.h> |
29e5be24 | 13 | #include <linux/genhd.h> |
1bae3098 | 14 | #include <linux/debugfs.h> |
58176a96 | 15 | |
bae45de0 CM |
16 | #include "ctree.h" |
17 | #include "disk-io.h" | |
18 | #include "transaction.h" | |
079b72bc | 19 | #include "sysfs.h" |
29e5be24 | 20 | #include "volumes.h" |
079b72bc | 21 | |
510d7360 | 22 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
2e7910d6 | 23 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
5ac1d209 | 24 | |
510d7360 JM |
25 | static u64 get_features(struct btrfs_fs_info *fs_info, |
26 | enum btrfs_feature_set set) | |
5ac1d209 | 27 | { |
510d7360 JM |
28 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
29 | if (set == FEAT_COMPAT) | |
30 | return btrfs_super_compat_flags(disk_super); | |
31 | else if (set == FEAT_COMPAT_RO) | |
32 | return btrfs_super_compat_ro_flags(disk_super); | |
33 | else | |
34 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
35 | } |
36 | ||
ba631941 JM |
37 | static void set_features(struct btrfs_fs_info *fs_info, |
38 | enum btrfs_feature_set set, u64 features) | |
39 | { | |
40 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
41 | if (set == FEAT_COMPAT) | |
42 | btrfs_set_super_compat_flags(disk_super, features); | |
43 | else if (set == FEAT_COMPAT_RO) | |
44 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
45 | else | |
46 | btrfs_set_super_incompat_flags(disk_super, features); | |
47 | } | |
48 | ||
49 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
50 | { | |
51 | int val = 0; | |
52 | u64 set, clear; | |
53 | switch (fa->feature_set) { | |
54 | case FEAT_COMPAT: | |
55 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
56 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
57 | break; | |
58 | case FEAT_COMPAT_RO: | |
59 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
60 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
61 | break; | |
62 | case FEAT_INCOMPAT: | |
63 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
64 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
65 | break; | |
66 | default: | |
62e85577 | 67 | pr_warn("btrfs: sysfs: unknown feature set %d\n", |
cc37bb04 DS |
68 | fa->feature_set); |
69 | return 0; | |
ba631941 JM |
70 | } |
71 | ||
72 | if (set & fa->feature_bit) | |
73 | val |= 1; | |
74 | if (clear & fa->feature_bit) | |
75 | val |= 2; | |
76 | ||
77 | return val; | |
78 | } | |
79 | ||
510d7360 JM |
80 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
81 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 82 | { |
510d7360 | 83 | int val = 0; |
5ac1d209 | 84 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 85 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 86 | if (fs_info) { |
510d7360 JM |
87 | u64 features = get_features(fs_info, fa->feature_set); |
88 | if (features & fa->feature_bit) | |
89 | val = 1; | |
ba631941 JM |
90 | } else |
91 | val = can_modify_feature(fa); | |
510d7360 JM |
92 | |
93 | return snprintf(buf, PAGE_SIZE, "%d\n", val); | |
5ac1d209 JM |
94 | } |
95 | ||
ba631941 JM |
96 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
97 | struct kobj_attribute *a, | |
98 | const char *buf, size_t count) | |
99 | { | |
100 | struct btrfs_fs_info *fs_info; | |
101 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
ba631941 JM |
102 | u64 features, set, clear; |
103 | unsigned long val; | |
104 | int ret; | |
105 | ||
106 | fs_info = to_fs_info(kobj); | |
107 | if (!fs_info) | |
108 | return -EPERM; | |
109 | ||
bc98a42c | 110 | if (sb_rdonly(fs_info->sb)) |
ee611138 DS |
111 | return -EROFS; |
112 | ||
ba631941 JM |
113 | ret = kstrtoul(skip_spaces(buf), 0, &val); |
114 | if (ret) | |
115 | return ret; | |
116 | ||
117 | if (fa->feature_set == FEAT_COMPAT) { | |
118 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
119 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
120 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
121 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
122 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
123 | } else { | |
124 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
125 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
126 | } | |
127 | ||
128 | features = get_features(fs_info, fa->feature_set); | |
129 | ||
130 | /* Nothing to do */ | |
131 | if ((val && (features & fa->feature_bit)) || | |
132 | (!val && !(features & fa->feature_bit))) | |
133 | return count; | |
134 | ||
135 | if ((val && !(set & fa->feature_bit)) || | |
136 | (!val && !(clear & fa->feature_bit))) { | |
137 | btrfs_info(fs_info, | |
138 | "%sabling feature %s on mounted fs is not supported.", | |
139 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
140 | return -EPERM; | |
141 | } | |
142 | ||
143 | btrfs_info(fs_info, "%s %s feature flag", | |
144 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
145 | ||
ba631941 JM |
146 | spin_lock(&fs_info->super_lock); |
147 | features = get_features(fs_info, fa->feature_set); | |
148 | if (val) | |
149 | features |= fa->feature_bit; | |
150 | else | |
151 | features &= ~fa->feature_bit; | |
152 | set_features(fs_info, fa->feature_set, features); | |
153 | spin_unlock(&fs_info->super_lock); | |
154 | ||
0eae2747 DS |
155 | /* |
156 | * We don't want to do full transaction commit from inside sysfs | |
157 | */ | |
158 | btrfs_set_pending(fs_info, COMMIT); | |
159 | wake_up_process(fs_info->transaction_kthread); | |
ba631941 JM |
160 | |
161 | return count; | |
162 | } | |
163 | ||
510d7360 JM |
164 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
165 | struct attribute *attr, int unused) | |
079b72bc | 166 | { |
510d7360 JM |
167 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
168 | umode_t mode = attr->mode; | |
169 | ||
170 | if (fs_info) { | |
171 | struct btrfs_feature_attr *fa; | |
172 | u64 features; | |
173 | ||
174 | fa = attr_to_btrfs_feature_attr(attr); | |
175 | features = get_features(fs_info, fa->feature_set); | |
176 | ||
ba631941 JM |
177 | if (can_modify_feature(fa)) |
178 | mode |= S_IWUSR; | |
179 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
180 | mode = 0; |
181 | } | |
182 | ||
183 | return mode; | |
079b72bc JM |
184 | } |
185 | ||
186 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
187 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
188 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
189 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
5c1aab1d | 190 | BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); |
079b72bc JM |
191 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
192 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
193 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
194 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 195 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
3b5bb73b | 196 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
079b72bc JM |
197 | |
198 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
199 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
200 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
201 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
202 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
5c1aab1d | 203 | BTRFS_FEAT_ATTR_PTR(compress_zstd), |
079b72bc JM |
204 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
205 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
206 | BTRFS_FEAT_ATTR_PTR(raid56), | |
207 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 208 | BTRFS_FEAT_ATTR_PTR(no_holes), |
3b5bb73b | 209 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
079b72bc JM |
210 | NULL |
211 | }; | |
212 | ||
213 | static const struct attribute_group btrfs_feature_attr_group = { | |
214 | .name = "features", | |
510d7360 | 215 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
216 | .attrs = btrfs_supported_feature_attrs, |
217 | }; | |
58176a96 | 218 | |
6ab0a202 JM |
219 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
220 | { | |
221 | u64 val; | |
222 | if (lock) | |
223 | spin_lock(lock); | |
224 | val = *value_ptr; | |
225 | if (lock) | |
226 | spin_unlock(lock); | |
227 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
228 | } | |
229 | ||
230 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
231 | struct kobj_attribute *ka, char *buf) | |
232 | { | |
233 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
234 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
235 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
236 | } | |
a969f4cc | 237 | BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
238 | |
239 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
240 | struct kobj_attribute *a, char *buf) | |
241 | { | |
242 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
243 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
244 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
245 | } | |
a969f4cc | 246 | BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
247 | |
248 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 249 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
250 | |
251 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
252 | struct kobj_attribute *attr, char *buf); | |
a969f4cc HK |
253 | BTRFS_ATTR(raid, total_bytes, raid_bytes_show); |
254 | BTRFS_ATTR(raid, used_bytes, raid_bytes_show); | |
6ab0a202 JM |
255 | |
256 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
257 | struct kobj_attribute *attr, char *buf) | |
258 | ||
259 | { | |
260 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
261 | struct btrfs_block_group_cache *block_group; | |
75cb379d | 262 | int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); |
6ab0a202 JM |
263 | u64 val = 0; |
264 | ||
265 | down_read(&sinfo->groups_sem); | |
266 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
a969f4cc | 267 | if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) |
6ab0a202 JM |
268 | val += block_group->key.offset; |
269 | else | |
270 | val += btrfs_block_group_used(&block_group->item); | |
271 | } | |
272 | up_read(&sinfo->groups_sem); | |
273 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
274 | } | |
275 | ||
276 | static struct attribute *raid_attributes[] = { | |
a969f4cc HK |
277 | BTRFS_ATTR_PTR(raid, total_bytes), |
278 | BTRFS_ATTR_PTR(raid, used_bytes), | |
6ab0a202 JM |
279 | NULL |
280 | }; | |
281 | ||
282 | static void release_raid_kobj(struct kobject *kobj) | |
283 | { | |
c1895442 | 284 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
285 | } |
286 | ||
287 | struct kobj_type btrfs_raid_ktype = { | |
288 | .sysfs_ops = &kobj_sysfs_ops, | |
289 | .release = release_raid_kobj, | |
290 | .default_attrs = raid_attributes, | |
291 | }; | |
292 | ||
293 | #define SPACE_INFO_ATTR(field) \ | |
294 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
295 | struct kobj_attribute *a, \ | |
296 | char *buf) \ | |
297 | { \ | |
298 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
299 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
300 | } \ | |
a969f4cc | 301 | BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) |
6ab0a202 JM |
302 | |
303 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
304 | struct kobj_attribute *a, | |
305 | char *buf) | |
306 | { | |
307 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
308 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
309 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
310 | } | |
311 | ||
312 | SPACE_INFO_ATTR(flags); | |
313 | SPACE_INFO_ATTR(total_bytes); | |
314 | SPACE_INFO_ATTR(bytes_used); | |
315 | SPACE_INFO_ATTR(bytes_pinned); | |
316 | SPACE_INFO_ATTR(bytes_reserved); | |
317 | SPACE_INFO_ATTR(bytes_may_use); | |
c1fd5c30 | 318 | SPACE_INFO_ATTR(bytes_readonly); |
6ab0a202 JM |
319 | SPACE_INFO_ATTR(disk_used); |
320 | SPACE_INFO_ATTR(disk_total); | |
a969f4cc HK |
321 | BTRFS_ATTR(space_info, total_bytes_pinned, |
322 | btrfs_space_info_show_total_bytes_pinned); | |
6ab0a202 JM |
323 | |
324 | static struct attribute *space_info_attrs[] = { | |
a969f4cc HK |
325 | BTRFS_ATTR_PTR(space_info, flags), |
326 | BTRFS_ATTR_PTR(space_info, total_bytes), | |
327 | BTRFS_ATTR_PTR(space_info, bytes_used), | |
328 | BTRFS_ATTR_PTR(space_info, bytes_pinned), | |
329 | BTRFS_ATTR_PTR(space_info, bytes_reserved), | |
330 | BTRFS_ATTR_PTR(space_info, bytes_may_use), | |
331 | BTRFS_ATTR_PTR(space_info, bytes_readonly), | |
332 | BTRFS_ATTR_PTR(space_info, disk_used), | |
333 | BTRFS_ATTR_PTR(space_info, disk_total), | |
334 | BTRFS_ATTR_PTR(space_info, total_bytes_pinned), | |
6ab0a202 JM |
335 | NULL, |
336 | }; | |
337 | ||
338 | static void space_info_release(struct kobject *kobj) | |
339 | { | |
340 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
341 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
342 | kfree(sinfo); | |
343 | } | |
344 | ||
345 | struct kobj_type space_info_ktype = { | |
346 | .sysfs_ops = &kobj_sysfs_ops, | |
347 | .release = space_info_release, | |
348 | .default_attrs = space_info_attrs, | |
349 | }; | |
350 | ||
351 | static const struct attribute *allocation_attrs[] = { | |
a969f4cc HK |
352 | BTRFS_ATTR_PTR(allocation, global_rsv_reserved), |
353 | BTRFS_ATTR_PTR(allocation, global_rsv_size), | |
6ab0a202 JM |
354 | NULL, |
355 | }; | |
356 | ||
f8ba9c11 JM |
357 | static ssize_t btrfs_label_show(struct kobject *kobj, |
358 | struct kobj_attribute *a, char *buf) | |
359 | { | |
360 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 361 | char *label = fs_info->super_copy->label; |
ee17fc80 DS |
362 | ssize_t ret; |
363 | ||
364 | spin_lock(&fs_info->super_lock); | |
365 | ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); | |
366 | spin_unlock(&fs_info->super_lock); | |
367 | ||
368 | return ret; | |
f8ba9c11 JM |
369 | } |
370 | ||
371 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
372 | struct kobj_attribute *a, | |
373 | const char *buf, size_t len) | |
374 | { | |
375 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 376 | size_t p_len; |
f8ba9c11 | 377 | |
66ac9fe7 DS |
378 | if (!fs_info) |
379 | return -EPERM; | |
380 | ||
bc98a42c | 381 | if (sb_rdonly(fs_info->sb)) |
79aec2b8 AJ |
382 | return -EROFS; |
383 | ||
48fcc3ff ST |
384 | /* |
385 | * p_len is the len until the first occurrence of either | |
386 | * '\n' or '\0' | |
387 | */ | |
388 | p_len = strcspn(buf, "\n"); | |
389 | ||
390 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 391 | return -EINVAL; |
f8ba9c11 | 392 | |
a6f69dc8 | 393 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
394 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
395 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 396 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 397 | |
a6f69dc8 DS |
398 | /* |
399 | * We don't want to do full transaction commit from inside sysfs | |
400 | */ | |
401 | btrfs_set_pending(fs_info, COMMIT); | |
402 | wake_up_process(fs_info->transaction_kthread); | |
f8ba9c11 | 403 | |
a6f69dc8 | 404 | return len; |
f8ba9c11 | 405 | } |
a969f4cc | 406 | BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 407 | |
df93589a DS |
408 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
409 | struct kobj_attribute *a, char *buf) | |
410 | { | |
411 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
412 | ||
093e037c | 413 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); |
df93589a DS |
414 | } |
415 | ||
a969f4cc | 416 | BTRFS_ATTR(, nodesize, btrfs_nodesize_show); |
df93589a DS |
417 | |
418 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
419 | struct kobj_attribute *a, char *buf) | |
420 | { | |
421 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
422 | ||
093e037c DS |
423 | return snprintf(buf, PAGE_SIZE, "%u\n", |
424 | fs_info->super_copy->sectorsize); | |
df93589a DS |
425 | } |
426 | ||
a969f4cc | 427 | BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); |
df93589a DS |
428 | |
429 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
430 | struct kobj_attribute *a, char *buf) | |
431 | { | |
432 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
433 | ||
093e037c DS |
434 | return snprintf(buf, PAGE_SIZE, "%u\n", |
435 | fs_info->super_copy->sectorsize); | |
df93589a DS |
436 | } |
437 | ||
a969f4cc | 438 | BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); |
df93589a | 439 | |
2723480a SD |
440 | static ssize_t quota_override_show(struct kobject *kobj, |
441 | struct kobj_attribute *a, char *buf) | |
442 | { | |
443 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
444 | int quota_override; | |
445 | ||
446 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
447 | return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); | |
448 | } | |
449 | ||
450 | static ssize_t quota_override_store(struct kobject *kobj, | |
451 | struct kobj_attribute *a, | |
452 | const char *buf, size_t len) | |
453 | { | |
454 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
455 | unsigned long knob; | |
456 | int err; | |
457 | ||
458 | if (!fs_info) | |
459 | return -EPERM; | |
460 | ||
461 | if (!capable(CAP_SYS_RESOURCE)) | |
462 | return -EPERM; | |
463 | ||
464 | err = kstrtoul(buf, 10, &knob); | |
465 | if (err) | |
466 | return err; | |
467 | if (knob > 1) | |
468 | return -EINVAL; | |
469 | ||
470 | if (knob) | |
471 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
472 | else | |
473 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
474 | ||
475 | return len; | |
476 | } | |
477 | ||
a969f4cc | 478 | BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); |
2723480a | 479 | |
0dd2906f | 480 | static const struct attribute *btrfs_attrs[] = { |
a969f4cc HK |
481 | BTRFS_ATTR_PTR(, label), |
482 | BTRFS_ATTR_PTR(, nodesize), | |
483 | BTRFS_ATTR_PTR(, sectorsize), | |
484 | BTRFS_ATTR_PTR(, clone_alignment), | |
485 | BTRFS_ATTR_PTR(, quota_override), | |
f8ba9c11 JM |
486 | NULL, |
487 | }; | |
488 | ||
c1b7e474 | 489 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
510d7360 | 490 | { |
2e7910d6 | 491 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
248d200d | 492 | |
c1b7e474 | 493 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
2e7910d6 | 494 | complete(&fs_devs->kobj_unregister); |
510d7360 JM |
495 | } |
496 | ||
497 | static struct kobj_type btrfs_ktype = { | |
498 | .sysfs_ops = &kobj_sysfs_ops, | |
c1b7e474 | 499 | .release = btrfs_release_fsid_kobj, |
510d7360 JM |
500 | }; |
501 | ||
2e7910d6 AJ |
502 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
503 | { | |
504 | if (kobj->ktype != &btrfs_ktype) | |
505 | return NULL; | |
c1b7e474 | 506 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
2e7910d6 AJ |
507 | } |
508 | ||
510d7360 JM |
509 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
510 | { | |
511 | if (kobj->ktype != &btrfs_ktype) | |
512 | return NULL; | |
2e7910d6 | 513 | return to_fs_devs(kobj)->fs_info; |
510d7360 | 514 | } |
58176a96 | 515 | |
e453d989 JM |
516 | #define NUM_FEATURE_BITS 64 |
517 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
518 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
519 | ||
e8c9f186 | 520 | static const u64 supported_feature_masks[3] = { |
e453d989 JM |
521 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
522 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
523 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
524 | }; | |
525 | ||
526 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
527 | { | |
528 | int set; | |
529 | ||
530 | for (set = 0; set < FEAT_MAX; set++) { | |
531 | int i; | |
532 | struct attribute *attrs[2]; | |
533 | struct attribute_group agroup = { | |
534 | .name = "features", | |
535 | .attrs = attrs, | |
536 | }; | |
537 | u64 features = get_features(fs_info, set); | |
538 | features &= ~supported_feature_masks[set]; | |
539 | ||
540 | if (!features) | |
541 | continue; | |
542 | ||
543 | attrs[1] = NULL; | |
544 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
545 | struct btrfs_feature_attr *fa; | |
546 | ||
547 | if (!(features & (1ULL << i))) | |
548 | continue; | |
549 | ||
550 | fa = &btrfs_feature_attrs[set][i]; | |
551 | attrs[0] = &fa->kobj_attr.attr; | |
552 | if (add) { | |
553 | int ret; | |
c1b7e474 | 554 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
555 | &agroup); |
556 | if (ret) | |
557 | return ret; | |
558 | } else | |
c1b7e474 | 559 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
560 | &agroup); |
561 | } | |
562 | ||
563 | } | |
564 | return 0; | |
565 | } | |
566 | ||
2e3e1281 | 567 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 | 568 | { |
2e7910d6 AJ |
569 | if (fs_devs->device_dir_kobj) { |
570 | kobject_del(fs_devs->device_dir_kobj); | |
571 | kobject_put(fs_devs->device_dir_kobj); | |
572 | fs_devs->device_dir_kobj = NULL; | |
aaf13305 AJ |
573 | } |
574 | ||
c1b7e474 AJ |
575 | if (fs_devs->fsid_kobj.state_initialized) { |
576 | kobject_del(&fs_devs->fsid_kobj); | |
577 | kobject_put(&fs_devs->fsid_kobj); | |
f90fc547 AJ |
578 | wait_for_completion(&fs_devs->kobj_unregister); |
579 | } | |
5ac1d209 JM |
580 | } |
581 | ||
2e3e1281 | 582 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1d1c1be3 | 583 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
2e3e1281 AJ |
584 | { |
585 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
586 | ||
587 | if (fs_devs) { | |
588 | __btrfs_sysfs_remove_fsid(fs_devs); | |
589 | return; | |
590 | } | |
591 | ||
592 | list_for_each_entry(fs_devs, fs_uuids, list) { | |
593 | __btrfs_sysfs_remove_fsid(fs_devs); | |
594 | } | |
595 | } | |
596 | ||
6618a59b | 597 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
e453d989 | 598 | { |
5a13f430 AJ |
599 | btrfs_reset_fs_info_ptr(fs_info); |
600 | ||
e453d989 JM |
601 | if (fs_info->space_info_kobj) { |
602 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
603 | kobject_del(fs_info->space_info_kobj); | |
604 | kobject_put(fs_info->space_info_kobj); | |
605 | } | |
e453d989 | 606 | addrm_unknown_feature_attrs(fs_info, false); |
c1b7e474 AJ |
607 | sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); |
608 | sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); | |
32576040 | 609 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); |
e453d989 JM |
610 | } |
611 | ||
79da4fa4 JM |
612 | const char * const btrfs_feature_set_names[3] = { |
613 | [FEAT_COMPAT] = "compat", | |
614 | [FEAT_COMPAT_RO] = "compat_ro", | |
615 | [FEAT_INCOMPAT] = "incompat", | |
616 | }; | |
617 | ||
3b02a68a JM |
618 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
619 | { | |
620 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
621 | int len = 0; | |
622 | int i; | |
623 | char *str; | |
624 | ||
625 | str = kmalloc(bufsize, GFP_KERNEL); | |
626 | if (!str) | |
627 | return str; | |
628 | ||
629 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
630 | const char *name; | |
631 | ||
632 | if (!(flags & (1ULL << i))) | |
633 | continue; | |
634 | ||
635 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
636 | len += snprintf(str + len, bufsize - len, "%s%s", | |
637 | len ? "," : "", name); | |
638 | } | |
639 | ||
640 | return str; | |
641 | } | |
642 | ||
79da4fa4 JM |
643 | static void init_feature_attrs(void) |
644 | { | |
645 | struct btrfs_feature_attr *fa; | |
646 | int set, i; | |
647 | ||
648 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
649 | ARRAY_SIZE(btrfs_feature_attrs)); | |
650 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
651 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
652 | ||
3b02a68a JM |
653 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
654 | memset(btrfs_unknown_feature_names, 0, | |
655 | sizeof(btrfs_unknown_feature_names)); | |
656 | ||
79da4fa4 JM |
657 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
658 | struct btrfs_feature_attr *sfa; | |
659 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 660 | int bit; |
79da4fa4 | 661 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
662 | bit = ilog2(sfa->feature_bit); |
663 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
664 | |
665 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
666 | } | |
667 | ||
668 | for (set = 0; set < FEAT_MAX; set++) { | |
669 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
670 | char *name = btrfs_unknown_feature_names[set][i]; | |
671 | fa = &btrfs_feature_attrs[set][i]; | |
672 | ||
673 | if (fa->kobj_attr.attr.name) | |
674 | continue; | |
675 | ||
676 | snprintf(name, 13, "%s:%u", | |
677 | btrfs_feature_set_names[set], i); | |
678 | ||
679 | fa->kobj_attr.attr.name = name; | |
680 | fa->kobj_attr.attr.mode = S_IRUGO; | |
681 | fa->feature_set = set; | |
682 | fa->feature_bit = 1ULL << i; | |
683 | } | |
684 | } | |
685 | } | |
686 | ||
e7e1aa9c AJ |
687 | /* when one_device is NULL, it removes all device links */ |
688 | ||
32576040 | 689 | int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, |
99994cde AJ |
690 | struct btrfs_device *one_device) |
691 | { | |
692 | struct hd_struct *disk; | |
693 | struct kobject *disk_kobj; | |
694 | ||
6c14a164 | 695 | if (!fs_devices->device_dir_kobj) |
99994cde AJ |
696 | return -EINVAL; |
697 | ||
87fa3bb0 | 698 | if (one_device && one_device->bdev) { |
99994cde AJ |
699 | disk = one_device->bdev->bd_part; |
700 | disk_kobj = &part_to_dev(disk)->kobj; | |
701 | ||
6c14a164 | 702 | sysfs_remove_link(fs_devices->device_dir_kobj, |
99994cde AJ |
703 | disk_kobj->name); |
704 | } | |
705 | ||
e7e1aa9c AJ |
706 | if (one_device) |
707 | return 0; | |
708 | ||
709 | list_for_each_entry(one_device, | |
6c14a164 | 710 | &fs_devices->devices, dev_list) { |
e7e1aa9c AJ |
711 | if (!one_device->bdev) |
712 | continue; | |
713 | disk = one_device->bdev->bd_part; | |
714 | disk_kobj = &part_to_dev(disk)->kobj; | |
715 | ||
6c14a164 | 716 | sysfs_remove_link(fs_devices->device_dir_kobj, |
e7e1aa9c AJ |
717 | disk_kobj->name); |
718 | } | |
719 | ||
99994cde AJ |
720 | return 0; |
721 | } | |
722 | ||
2e7910d6 | 723 | int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) |
29e5be24 | 724 | { |
2e7910d6 AJ |
725 | if (!fs_devs->device_dir_kobj) |
726 | fs_devs->device_dir_kobj = kobject_create_and_add("devices", | |
c1b7e474 | 727 | &fs_devs->fsid_kobj); |
0d39376a | 728 | |
2e7910d6 | 729 | if (!fs_devs->device_dir_kobj) |
29e5be24 JM |
730 | return -ENOMEM; |
731 | ||
00c921c2 AJ |
732 | return 0; |
733 | } | |
734 | ||
e3bd6973 | 735 | int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, |
1ba43816 | 736 | struct btrfs_device *one_device) |
00c921c2 AJ |
737 | { |
738 | int error = 0; | |
00c921c2 AJ |
739 | struct btrfs_device *dev; |
740 | ||
29e5be24 | 741 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
f085381e AJ |
742 | struct hd_struct *disk; |
743 | struct kobject *disk_kobj; | |
744 | ||
745 | if (!dev->bdev) | |
746 | continue; | |
747 | ||
0d39376a AJ |
748 | if (one_device && one_device != dev) |
749 | continue; | |
750 | ||
f085381e AJ |
751 | disk = dev->bdev->bd_part; |
752 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 | 753 | |
2e7910d6 | 754 | error = sysfs_create_link(fs_devices->device_dir_kobj, |
29e5be24 JM |
755 | disk_kobj, disk_kobj->name); |
756 | if (error) | |
757 | break; | |
758 | } | |
759 | ||
760 | return error; | |
761 | } | |
762 | ||
510d7360 JM |
763 | /* /sys/fs/btrfs/ entry */ |
764 | static struct kset *btrfs_kset; | |
765 | ||
1bae3098 DS |
766 | /* /sys/kernel/debug/btrfs */ |
767 | static struct dentry *btrfs_debugfs_root_dentry; | |
768 | ||
769 | /* Debugging tunables and exported data */ | |
770 | u64 btrfs_debugfs_test; | |
771 | ||
72059215 AJ |
772 | /* |
773 | * Can be called by the device discovery thread. | |
774 | * And parent can be specified for seed device | |
775 | */ | |
0c10e2d4 | 776 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, |
72059215 | 777 | struct kobject *parent) |
5ac1d209 JM |
778 | { |
779 | int error; | |
780 | ||
2e7910d6 | 781 | init_completion(&fs_devs->kobj_unregister); |
c1b7e474 AJ |
782 | fs_devs->fsid_kobj.kset = btrfs_kset; |
783 | error = kobject_init_and_add(&fs_devs->fsid_kobj, | |
24bd69cb | 784 | &btrfs_ktype, parent, "%pU", fs_devs->fsid); |
72059215 AJ |
785 | return error; |
786 | } | |
787 | ||
96f3136e | 788 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
72059215 AJ |
789 | { |
790 | int error; | |
2e7910d6 | 791 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e474 | 792 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
72059215 | 793 | |
5a13f430 AJ |
794 | btrfs_set_fs_info_ptr(fs_info); |
795 | ||
e3bd6973 | 796 | error = btrfs_sysfs_add_device_link(fs_devs, NULL); |
b7c35e81 | 797 | if (error) |
aaf13305 | 798 | return error; |
aaf13305 | 799 | |
c1b7e474 | 800 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989 | 801 | if (error) { |
32576040 | 802 | btrfs_sysfs_rm_device_link(fs_devs, NULL); |
e453d989 JM |
803 | return error; |
804 | } | |
79da4fa4 | 805 | |
c1b7e474 | 806 | error = sysfs_create_group(fsid_kobj, |
0dd2906f AJ |
807 | &btrfs_feature_attr_group); |
808 | if (error) | |
809 | goto failure; | |
810 | ||
e453d989 | 811 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
812 | if (error) |
813 | goto failure; | |
814 | ||
6ab0a202 | 815 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e474 | 816 | fsid_kobj); |
6ab0a202 JM |
817 | if (!fs_info->space_info_kobj) { |
818 | error = -ENOMEM; | |
819 | goto failure; | |
820 | } | |
821 | ||
822 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
823 | if (error) | |
824 | goto failure; | |
825 | ||
79da4fa4 JM |
826 | return 0; |
827 | failure: | |
6618a59b | 828 | btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209 JM |
829 | return error; |
830 | } | |
831 | ||
444e7516 DS |
832 | |
833 | /* | |
834 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
835 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
836 | */ | |
837 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, | |
838 | u64 bit, enum btrfs_feature_set set) | |
839 | { | |
840 | struct btrfs_fs_devices *fs_devs; | |
841 | struct kobject *fsid_kobj; | |
842 | u64 features; | |
843 | int ret; | |
844 | ||
845 | if (!fs_info) | |
846 | return; | |
847 | ||
848 | features = get_features(fs_info, set); | |
849 | ASSERT(bit & supported_feature_masks[set]); | |
850 | ||
851 | fs_devs = fs_info->fs_devices; | |
852 | fsid_kobj = &fs_devs->fsid_kobj; | |
853 | ||
bf609206 DS |
854 | if (!fsid_kobj->state_initialized) |
855 | return; | |
856 | ||
444e7516 DS |
857 | /* |
858 | * FIXME: this is too heavy to update just one value, ideally we'd like | |
859 | * to use sysfs_update_group but some refactoring is needed first. | |
860 | */ | |
861 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); | |
862 | ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); | |
863 | } | |
864 | ||
1bae3098 DS |
865 | static int btrfs_init_debugfs(void) |
866 | { | |
867 | #ifdef CONFIG_DEBUG_FS | |
868 | btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); | |
869 | if (!btrfs_debugfs_root_dentry) | |
870 | return -ENOMEM; | |
871 | ||
b0de6c4c DS |
872 | /* |
873 | * Example code, how to export data through debugfs. | |
874 | * | |
875 | * file: /sys/kernel/debug/btrfs/test | |
876 | * contents of: btrfs_debugfs_test | |
877 | */ | |
878 | #ifdef CONFIG_BTRFS_DEBUG | |
07f6a480 | 879 | debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, |
1bae3098 | 880 | &btrfs_debugfs_test); |
b0de6c4c DS |
881 | #endif |
882 | ||
1bae3098 DS |
883 | #endif |
884 | return 0; | |
885 | } | |
886 | ||
f5c29bd9 | 887 | int __init btrfs_init_sysfs(void) |
58176a96 | 888 | { |
079b72bc | 889 | int ret; |
1bae3098 | 890 | |
e3fe4e71 GK |
891 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
892 | if (!btrfs_kset) | |
893 | return -ENOMEM; | |
079b72bc | 894 | |
1bae3098 DS |
895 | ret = btrfs_init_debugfs(); |
896 | if (ret) | |
001a648d | 897 | goto out1; |
79da4fa4 | 898 | |
1bae3098 | 899 | init_feature_attrs(); |
079b72bc | 900 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
901 | if (ret) |
902 | goto out2; | |
903 | ||
904 | return 0; | |
905 | out2: | |
906 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); | |
907 | out1: | |
908 | kset_unregister(btrfs_kset); | |
079b72bc | 909 | |
1bae3098 | 910 | return ret; |
58176a96 JB |
911 | } |
912 | ||
e67c718b | 913 | void __cold btrfs_exit_sysfs(void) |
58176a96 | 914 | { |
079b72bc | 915 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 916 | kset_unregister(btrfs_kset); |
1bae3098 | 917 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a96 | 918 | } |
55d47414 | 919 |