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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
58176a96 JB |
19 | #include <linux/sched.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/completion.h> | |
23 | #include <linux/buffer_head.h> | |
58176a96 | 24 | #include <linux/kobject.h> |
79da4fa4 | 25 | #include <linux/bug.h> |
29e5be24 | 26 | #include <linux/genhd.h> |
1bae3098 | 27 | #include <linux/debugfs.h> |
58176a96 | 28 | |
bae45de0 CM |
29 | #include "ctree.h" |
30 | #include "disk-io.h" | |
31 | #include "transaction.h" | |
079b72bc | 32 | #include "sysfs.h" |
29e5be24 | 33 | #include "volumes.h" |
079b72bc | 34 | |
510d7360 | 35 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
2e7910d6 | 36 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
5ac1d209 | 37 | |
510d7360 JM |
38 | static u64 get_features(struct btrfs_fs_info *fs_info, |
39 | enum btrfs_feature_set set) | |
5ac1d209 | 40 | { |
510d7360 JM |
41 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
42 | if (set == FEAT_COMPAT) | |
43 | return btrfs_super_compat_flags(disk_super); | |
44 | else if (set == FEAT_COMPAT_RO) | |
45 | return btrfs_super_compat_ro_flags(disk_super); | |
46 | else | |
47 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
48 | } |
49 | ||
ba631941 JM |
50 | static void set_features(struct btrfs_fs_info *fs_info, |
51 | enum btrfs_feature_set set, u64 features) | |
52 | { | |
53 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
54 | if (set == FEAT_COMPAT) | |
55 | btrfs_set_super_compat_flags(disk_super, features); | |
56 | else if (set == FEAT_COMPAT_RO) | |
57 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
58 | else | |
59 | btrfs_set_super_incompat_flags(disk_super, features); | |
60 | } | |
61 | ||
62 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
63 | { | |
64 | int val = 0; | |
65 | u64 set, clear; | |
66 | switch (fa->feature_set) { | |
67 | case FEAT_COMPAT: | |
68 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
69 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
70 | break; | |
71 | case FEAT_COMPAT_RO: | |
72 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
73 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
74 | break; | |
75 | case FEAT_INCOMPAT: | |
76 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
77 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
78 | break; | |
79 | default: | |
62e85577 | 80 | pr_warn("btrfs: sysfs: unknown feature set %d\n", |
cc37bb04 DS |
81 | fa->feature_set); |
82 | return 0; | |
ba631941 JM |
83 | } |
84 | ||
85 | if (set & fa->feature_bit) | |
86 | val |= 1; | |
87 | if (clear & fa->feature_bit) | |
88 | val |= 2; | |
89 | ||
90 | return val; | |
91 | } | |
92 | ||
510d7360 JM |
93 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
94 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 95 | { |
510d7360 | 96 | int val = 0; |
5ac1d209 | 97 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 98 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 99 | if (fs_info) { |
510d7360 JM |
100 | u64 features = get_features(fs_info, fa->feature_set); |
101 | if (features & fa->feature_bit) | |
102 | val = 1; | |
ba631941 JM |
103 | } else |
104 | val = can_modify_feature(fa); | |
510d7360 JM |
105 | |
106 | return snprintf(buf, PAGE_SIZE, "%d\n", val); | |
5ac1d209 JM |
107 | } |
108 | ||
ba631941 JM |
109 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
110 | struct kobj_attribute *a, | |
111 | const char *buf, size_t count) | |
112 | { | |
113 | struct btrfs_fs_info *fs_info; | |
114 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
ba631941 JM |
115 | u64 features, set, clear; |
116 | unsigned long val; | |
117 | int ret; | |
118 | ||
119 | fs_info = to_fs_info(kobj); | |
120 | if (!fs_info) | |
121 | return -EPERM; | |
122 | ||
bc98a42c | 123 | if (sb_rdonly(fs_info->sb)) |
ee611138 DS |
124 | return -EROFS; |
125 | ||
ba631941 JM |
126 | ret = kstrtoul(skip_spaces(buf), 0, &val); |
127 | if (ret) | |
128 | return ret; | |
129 | ||
130 | if (fa->feature_set == FEAT_COMPAT) { | |
131 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
132 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
133 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
134 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
135 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
136 | } else { | |
137 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
138 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
139 | } | |
140 | ||
141 | features = get_features(fs_info, fa->feature_set); | |
142 | ||
143 | /* Nothing to do */ | |
144 | if ((val && (features & fa->feature_bit)) || | |
145 | (!val && !(features & fa->feature_bit))) | |
146 | return count; | |
147 | ||
148 | if ((val && !(set & fa->feature_bit)) || | |
149 | (!val && !(clear & fa->feature_bit))) { | |
150 | btrfs_info(fs_info, | |
151 | "%sabling feature %s on mounted fs is not supported.", | |
152 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
153 | return -EPERM; | |
154 | } | |
155 | ||
156 | btrfs_info(fs_info, "%s %s feature flag", | |
157 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
158 | ||
ba631941 JM |
159 | spin_lock(&fs_info->super_lock); |
160 | features = get_features(fs_info, fa->feature_set); | |
161 | if (val) | |
162 | features |= fa->feature_bit; | |
163 | else | |
164 | features &= ~fa->feature_bit; | |
165 | set_features(fs_info, fa->feature_set, features); | |
166 | spin_unlock(&fs_info->super_lock); | |
167 | ||
0eae2747 DS |
168 | /* |
169 | * We don't want to do full transaction commit from inside sysfs | |
170 | */ | |
171 | btrfs_set_pending(fs_info, COMMIT); | |
172 | wake_up_process(fs_info->transaction_kthread); | |
ba631941 JM |
173 | |
174 | return count; | |
175 | } | |
176 | ||
510d7360 JM |
177 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
178 | struct attribute *attr, int unused) | |
079b72bc | 179 | { |
510d7360 JM |
180 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
181 | umode_t mode = attr->mode; | |
182 | ||
183 | if (fs_info) { | |
184 | struct btrfs_feature_attr *fa; | |
185 | u64 features; | |
186 | ||
187 | fa = attr_to_btrfs_feature_attr(attr); | |
188 | features = get_features(fs_info, fa->feature_set); | |
189 | ||
ba631941 JM |
190 | if (can_modify_feature(fa)) |
191 | mode |= S_IWUSR; | |
192 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
193 | mode = 0; |
194 | } | |
195 | ||
196 | return mode; | |
079b72bc JM |
197 | } |
198 | ||
199 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
200 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
201 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
202 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
5c1aab1d | 203 | BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); |
079b72bc JM |
204 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
205 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
206 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
207 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 208 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
3b5bb73b | 209 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
079b72bc JM |
210 | |
211 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
212 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
213 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
214 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
215 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
5c1aab1d | 216 | BTRFS_FEAT_ATTR_PTR(compress_zstd), |
079b72bc JM |
217 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
218 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
219 | BTRFS_FEAT_ATTR_PTR(raid56), | |
220 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 221 | BTRFS_FEAT_ATTR_PTR(no_holes), |
3b5bb73b | 222 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
079b72bc JM |
223 | NULL |
224 | }; | |
225 | ||
226 | static const struct attribute_group btrfs_feature_attr_group = { | |
227 | .name = "features", | |
510d7360 | 228 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
229 | .attrs = btrfs_supported_feature_attrs, |
230 | }; | |
58176a96 | 231 | |
6ab0a202 JM |
232 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
233 | { | |
234 | u64 val; | |
235 | if (lock) | |
236 | spin_lock(lock); | |
237 | val = *value_ptr; | |
238 | if (lock) | |
239 | spin_unlock(lock); | |
240 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
241 | } | |
242 | ||
243 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
244 | struct kobj_attribute *ka, char *buf) | |
245 | { | |
246 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
247 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
248 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
249 | } | |
98b3d389 | 250 | BTRFS_ATTR(global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
251 | |
252 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
253 | struct kobj_attribute *a, char *buf) | |
254 | { | |
255 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
256 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
257 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
258 | } | |
98b3d389 | 259 | BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
260 | |
261 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 262 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
263 | |
264 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
265 | struct kobj_attribute *attr, char *buf); | |
266 | BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); | |
267 | BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); | |
268 | ||
269 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
270 | struct kobj_attribute *attr, char *buf) | |
271 | ||
272 | { | |
273 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
274 | struct btrfs_block_group_cache *block_group; | |
c1895442 | 275 | int index = to_raid_kobj(kobj)->raid_type; |
6ab0a202 JM |
276 | u64 val = 0; |
277 | ||
278 | down_read(&sinfo->groups_sem); | |
279 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
280 | if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) | |
281 | val += block_group->key.offset; | |
282 | else | |
283 | val += btrfs_block_group_used(&block_group->item); | |
284 | } | |
285 | up_read(&sinfo->groups_sem); | |
286 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
287 | } | |
288 | ||
289 | static struct attribute *raid_attributes[] = { | |
290 | BTRFS_RAID_ATTR_PTR(total_bytes), | |
291 | BTRFS_RAID_ATTR_PTR(used_bytes), | |
292 | NULL | |
293 | }; | |
294 | ||
295 | static void release_raid_kobj(struct kobject *kobj) | |
296 | { | |
c1895442 | 297 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
298 | } |
299 | ||
300 | struct kobj_type btrfs_raid_ktype = { | |
301 | .sysfs_ops = &kobj_sysfs_ops, | |
302 | .release = release_raid_kobj, | |
303 | .default_attrs = raid_attributes, | |
304 | }; | |
305 | ||
306 | #define SPACE_INFO_ATTR(field) \ | |
307 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
308 | struct kobj_attribute *a, \ | |
309 | char *buf) \ | |
310 | { \ | |
311 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
312 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
313 | } \ | |
98b3d389 | 314 | BTRFS_ATTR(field, btrfs_space_info_show_##field) |
6ab0a202 JM |
315 | |
316 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
317 | struct kobj_attribute *a, | |
318 | char *buf) | |
319 | { | |
320 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
321 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
322 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
323 | } | |
324 | ||
325 | SPACE_INFO_ATTR(flags); | |
326 | SPACE_INFO_ATTR(total_bytes); | |
327 | SPACE_INFO_ATTR(bytes_used); | |
328 | SPACE_INFO_ATTR(bytes_pinned); | |
329 | SPACE_INFO_ATTR(bytes_reserved); | |
330 | SPACE_INFO_ATTR(bytes_may_use); | |
c1fd5c30 | 331 | SPACE_INFO_ATTR(bytes_readonly); |
6ab0a202 JM |
332 | SPACE_INFO_ATTR(disk_used); |
333 | SPACE_INFO_ATTR(disk_total); | |
98b3d389 | 334 | BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); |
6ab0a202 JM |
335 | |
336 | static struct attribute *space_info_attrs[] = { | |
337 | BTRFS_ATTR_PTR(flags), | |
338 | BTRFS_ATTR_PTR(total_bytes), | |
339 | BTRFS_ATTR_PTR(bytes_used), | |
340 | BTRFS_ATTR_PTR(bytes_pinned), | |
341 | BTRFS_ATTR_PTR(bytes_reserved), | |
342 | BTRFS_ATTR_PTR(bytes_may_use), | |
c1fd5c30 | 343 | BTRFS_ATTR_PTR(bytes_readonly), |
6ab0a202 JM |
344 | BTRFS_ATTR_PTR(disk_used), |
345 | BTRFS_ATTR_PTR(disk_total), | |
346 | BTRFS_ATTR_PTR(total_bytes_pinned), | |
347 | NULL, | |
348 | }; | |
349 | ||
350 | static void space_info_release(struct kobject *kobj) | |
351 | { | |
352 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
353 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
354 | kfree(sinfo); | |
355 | } | |
356 | ||
357 | struct kobj_type space_info_ktype = { | |
358 | .sysfs_ops = &kobj_sysfs_ops, | |
359 | .release = space_info_release, | |
360 | .default_attrs = space_info_attrs, | |
361 | }; | |
362 | ||
363 | static const struct attribute *allocation_attrs[] = { | |
364 | BTRFS_ATTR_PTR(global_rsv_reserved), | |
365 | BTRFS_ATTR_PTR(global_rsv_size), | |
366 | NULL, | |
367 | }; | |
368 | ||
f8ba9c11 JM |
369 | static ssize_t btrfs_label_show(struct kobject *kobj, |
370 | struct kobj_attribute *a, char *buf) | |
371 | { | |
372 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 373 | char *label = fs_info->super_copy->label; |
ee17fc80 DS |
374 | ssize_t ret; |
375 | ||
376 | spin_lock(&fs_info->super_lock); | |
377 | ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); | |
378 | spin_unlock(&fs_info->super_lock); | |
379 | ||
380 | return ret; | |
f8ba9c11 JM |
381 | } |
382 | ||
383 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
384 | struct kobj_attribute *a, | |
385 | const char *buf, size_t len) | |
386 | { | |
387 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 388 | size_t p_len; |
f8ba9c11 | 389 | |
66ac9fe7 DS |
390 | if (!fs_info) |
391 | return -EPERM; | |
392 | ||
bc98a42c | 393 | if (sb_rdonly(fs_info->sb)) |
79aec2b8 AJ |
394 | return -EROFS; |
395 | ||
48fcc3ff ST |
396 | /* |
397 | * p_len is the len until the first occurrence of either | |
398 | * '\n' or '\0' | |
399 | */ | |
400 | p_len = strcspn(buf, "\n"); | |
401 | ||
402 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 403 | return -EINVAL; |
f8ba9c11 | 404 | |
a6f69dc8 | 405 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
406 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
407 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 408 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 409 | |
a6f69dc8 DS |
410 | /* |
411 | * We don't want to do full transaction commit from inside sysfs | |
412 | */ | |
413 | btrfs_set_pending(fs_info, COMMIT); | |
414 | wake_up_process(fs_info->transaction_kthread); | |
f8ba9c11 | 415 | |
a6f69dc8 | 416 | return len; |
f8ba9c11 | 417 | } |
20ee0825 | 418 | BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 419 | |
df93589a DS |
420 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
421 | struct kobj_attribute *a, char *buf) | |
422 | { | |
423 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
424 | ||
425 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); | |
426 | } | |
427 | ||
98b3d389 | 428 | BTRFS_ATTR(nodesize, btrfs_nodesize_show); |
df93589a DS |
429 | |
430 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
431 | struct kobj_attribute *a, char *buf) | |
432 | { | |
433 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
434 | ||
5d163e0e JM |
435 | return snprintf(buf, PAGE_SIZE, "%u\n", |
436 | fs_info->super_copy->sectorsize); | |
df93589a DS |
437 | } |
438 | ||
98b3d389 | 439 | BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); |
df93589a DS |
440 | |
441 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
442 | struct kobj_attribute *a, char *buf) | |
443 | { | |
444 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
445 | ||
5d163e0e JM |
446 | return snprintf(buf, PAGE_SIZE, "%u\n", |
447 | fs_info->super_copy->sectorsize); | |
df93589a DS |
448 | } |
449 | ||
98b3d389 | 450 | BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); |
df93589a | 451 | |
2723480a SD |
452 | static ssize_t quota_override_show(struct kobject *kobj, |
453 | struct kobj_attribute *a, char *buf) | |
454 | { | |
455 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
456 | int quota_override; | |
457 | ||
458 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
459 | return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); | |
460 | } | |
461 | ||
462 | static ssize_t quota_override_store(struct kobject *kobj, | |
463 | struct kobj_attribute *a, | |
464 | const char *buf, size_t len) | |
465 | { | |
466 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
467 | unsigned long knob; | |
468 | int err; | |
469 | ||
470 | if (!fs_info) | |
471 | return -EPERM; | |
472 | ||
473 | if (!capable(CAP_SYS_RESOURCE)) | |
474 | return -EPERM; | |
475 | ||
476 | err = kstrtoul(buf, 10, &knob); | |
477 | if (err) | |
478 | return err; | |
479 | if (knob > 1) | |
480 | return -EINVAL; | |
481 | ||
482 | if (knob) | |
483 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
484 | else | |
485 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
486 | ||
487 | return len; | |
488 | } | |
489 | ||
490 | BTRFS_ATTR_RW(quota_override, quota_override_show, quota_override_store); | |
491 | ||
0dd2906f | 492 | static const struct attribute *btrfs_attrs[] = { |
f8ba9c11 | 493 | BTRFS_ATTR_PTR(label), |
df93589a DS |
494 | BTRFS_ATTR_PTR(nodesize), |
495 | BTRFS_ATTR_PTR(sectorsize), | |
496 | BTRFS_ATTR_PTR(clone_alignment), | |
2723480a | 497 | BTRFS_ATTR_PTR(quota_override), |
f8ba9c11 JM |
498 | NULL, |
499 | }; | |
500 | ||
c1b7e474 | 501 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
510d7360 | 502 | { |
2e7910d6 | 503 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
248d200d | 504 | |
c1b7e474 | 505 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
2e7910d6 | 506 | complete(&fs_devs->kobj_unregister); |
510d7360 JM |
507 | } |
508 | ||
509 | static struct kobj_type btrfs_ktype = { | |
510 | .sysfs_ops = &kobj_sysfs_ops, | |
c1b7e474 | 511 | .release = btrfs_release_fsid_kobj, |
510d7360 JM |
512 | }; |
513 | ||
2e7910d6 AJ |
514 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
515 | { | |
516 | if (kobj->ktype != &btrfs_ktype) | |
517 | return NULL; | |
c1b7e474 | 518 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
2e7910d6 AJ |
519 | } |
520 | ||
510d7360 JM |
521 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
522 | { | |
523 | if (kobj->ktype != &btrfs_ktype) | |
524 | return NULL; | |
2e7910d6 | 525 | return to_fs_devs(kobj)->fs_info; |
510d7360 | 526 | } |
58176a96 | 527 | |
e453d989 JM |
528 | #define NUM_FEATURE_BITS 64 |
529 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
530 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
531 | ||
e8c9f186 | 532 | static const u64 supported_feature_masks[3] = { |
e453d989 JM |
533 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
534 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
535 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
536 | }; | |
537 | ||
538 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
539 | { | |
540 | int set; | |
541 | ||
542 | for (set = 0; set < FEAT_MAX; set++) { | |
543 | int i; | |
544 | struct attribute *attrs[2]; | |
545 | struct attribute_group agroup = { | |
546 | .name = "features", | |
547 | .attrs = attrs, | |
548 | }; | |
549 | u64 features = get_features(fs_info, set); | |
550 | features &= ~supported_feature_masks[set]; | |
551 | ||
552 | if (!features) | |
553 | continue; | |
554 | ||
555 | attrs[1] = NULL; | |
556 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
557 | struct btrfs_feature_attr *fa; | |
558 | ||
559 | if (!(features & (1ULL << i))) | |
560 | continue; | |
561 | ||
562 | fa = &btrfs_feature_attrs[set][i]; | |
563 | attrs[0] = &fa->kobj_attr.attr; | |
564 | if (add) { | |
565 | int ret; | |
c1b7e474 | 566 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
567 | &agroup); |
568 | if (ret) | |
569 | return ret; | |
570 | } else | |
c1b7e474 | 571 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
572 | &agroup); |
573 | } | |
574 | ||
575 | } | |
576 | return 0; | |
577 | } | |
578 | ||
2e3e1281 | 579 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 | 580 | { |
2e7910d6 AJ |
581 | if (fs_devs->device_dir_kobj) { |
582 | kobject_del(fs_devs->device_dir_kobj); | |
583 | kobject_put(fs_devs->device_dir_kobj); | |
584 | fs_devs->device_dir_kobj = NULL; | |
aaf13305 AJ |
585 | } |
586 | ||
c1b7e474 AJ |
587 | if (fs_devs->fsid_kobj.state_initialized) { |
588 | kobject_del(&fs_devs->fsid_kobj); | |
589 | kobject_put(&fs_devs->fsid_kobj); | |
f90fc547 AJ |
590 | wait_for_completion(&fs_devs->kobj_unregister); |
591 | } | |
5ac1d209 JM |
592 | } |
593 | ||
2e3e1281 | 594 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1d1c1be3 | 595 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
2e3e1281 AJ |
596 | { |
597 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
598 | ||
599 | if (fs_devs) { | |
600 | __btrfs_sysfs_remove_fsid(fs_devs); | |
601 | return; | |
602 | } | |
603 | ||
604 | list_for_each_entry(fs_devs, fs_uuids, list) { | |
605 | __btrfs_sysfs_remove_fsid(fs_devs); | |
606 | } | |
607 | } | |
608 | ||
6618a59b | 609 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
e453d989 | 610 | { |
5a13f430 AJ |
611 | btrfs_reset_fs_info_ptr(fs_info); |
612 | ||
e453d989 JM |
613 | if (fs_info->space_info_kobj) { |
614 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
615 | kobject_del(fs_info->space_info_kobj); | |
616 | kobject_put(fs_info->space_info_kobj); | |
617 | } | |
e453d989 | 618 | addrm_unknown_feature_attrs(fs_info, false); |
c1b7e474 AJ |
619 | sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); |
620 | sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); | |
32576040 | 621 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); |
e453d989 JM |
622 | } |
623 | ||
79da4fa4 JM |
624 | const char * const btrfs_feature_set_names[3] = { |
625 | [FEAT_COMPAT] = "compat", | |
626 | [FEAT_COMPAT_RO] = "compat_ro", | |
627 | [FEAT_INCOMPAT] = "incompat", | |
628 | }; | |
629 | ||
3b02a68a JM |
630 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
631 | { | |
632 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
633 | int len = 0; | |
634 | int i; | |
635 | char *str; | |
636 | ||
637 | str = kmalloc(bufsize, GFP_KERNEL); | |
638 | if (!str) | |
639 | return str; | |
640 | ||
641 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
642 | const char *name; | |
643 | ||
644 | if (!(flags & (1ULL << i))) | |
645 | continue; | |
646 | ||
647 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
648 | len += snprintf(str + len, bufsize - len, "%s%s", | |
649 | len ? "," : "", name); | |
650 | } | |
651 | ||
652 | return str; | |
653 | } | |
654 | ||
79da4fa4 JM |
655 | static void init_feature_attrs(void) |
656 | { | |
657 | struct btrfs_feature_attr *fa; | |
658 | int set, i; | |
659 | ||
660 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
661 | ARRAY_SIZE(btrfs_feature_attrs)); | |
662 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
663 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
664 | ||
3b02a68a JM |
665 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
666 | memset(btrfs_unknown_feature_names, 0, | |
667 | sizeof(btrfs_unknown_feature_names)); | |
668 | ||
79da4fa4 JM |
669 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
670 | struct btrfs_feature_attr *sfa; | |
671 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 672 | int bit; |
79da4fa4 | 673 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
674 | bit = ilog2(sfa->feature_bit); |
675 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
676 | |
677 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
678 | } | |
679 | ||
680 | for (set = 0; set < FEAT_MAX; set++) { | |
681 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
682 | char *name = btrfs_unknown_feature_names[set][i]; | |
683 | fa = &btrfs_feature_attrs[set][i]; | |
684 | ||
685 | if (fa->kobj_attr.attr.name) | |
686 | continue; | |
687 | ||
688 | snprintf(name, 13, "%s:%u", | |
689 | btrfs_feature_set_names[set], i); | |
690 | ||
691 | fa->kobj_attr.attr.name = name; | |
692 | fa->kobj_attr.attr.mode = S_IRUGO; | |
693 | fa->feature_set = set; | |
694 | fa->feature_bit = 1ULL << i; | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
e7e1aa9c AJ |
699 | /* when one_device is NULL, it removes all device links */ |
700 | ||
32576040 | 701 | int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, |
99994cde AJ |
702 | struct btrfs_device *one_device) |
703 | { | |
704 | struct hd_struct *disk; | |
705 | struct kobject *disk_kobj; | |
706 | ||
6c14a164 | 707 | if (!fs_devices->device_dir_kobj) |
99994cde AJ |
708 | return -EINVAL; |
709 | ||
87fa3bb0 | 710 | if (one_device && one_device->bdev) { |
99994cde AJ |
711 | disk = one_device->bdev->bd_part; |
712 | disk_kobj = &part_to_dev(disk)->kobj; | |
713 | ||
6c14a164 | 714 | sysfs_remove_link(fs_devices->device_dir_kobj, |
99994cde AJ |
715 | disk_kobj->name); |
716 | } | |
717 | ||
e7e1aa9c AJ |
718 | if (one_device) |
719 | return 0; | |
720 | ||
721 | list_for_each_entry(one_device, | |
6c14a164 | 722 | &fs_devices->devices, dev_list) { |
e7e1aa9c AJ |
723 | if (!one_device->bdev) |
724 | continue; | |
725 | disk = one_device->bdev->bd_part; | |
726 | disk_kobj = &part_to_dev(disk)->kobj; | |
727 | ||
6c14a164 | 728 | sysfs_remove_link(fs_devices->device_dir_kobj, |
e7e1aa9c AJ |
729 | disk_kobj->name); |
730 | } | |
731 | ||
99994cde AJ |
732 | return 0; |
733 | } | |
734 | ||
2e7910d6 | 735 | int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) |
29e5be24 | 736 | { |
2e7910d6 AJ |
737 | if (!fs_devs->device_dir_kobj) |
738 | fs_devs->device_dir_kobj = kobject_create_and_add("devices", | |
c1b7e474 | 739 | &fs_devs->fsid_kobj); |
0d39376a | 740 | |
2e7910d6 | 741 | if (!fs_devs->device_dir_kobj) |
29e5be24 JM |
742 | return -ENOMEM; |
743 | ||
00c921c2 AJ |
744 | return 0; |
745 | } | |
746 | ||
e3bd6973 | 747 | int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, |
1ba43816 | 748 | struct btrfs_device *one_device) |
00c921c2 AJ |
749 | { |
750 | int error = 0; | |
00c921c2 AJ |
751 | struct btrfs_device *dev; |
752 | ||
29e5be24 | 753 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
f085381e AJ |
754 | struct hd_struct *disk; |
755 | struct kobject *disk_kobj; | |
756 | ||
757 | if (!dev->bdev) | |
758 | continue; | |
759 | ||
0d39376a AJ |
760 | if (one_device && one_device != dev) |
761 | continue; | |
762 | ||
f085381e AJ |
763 | disk = dev->bdev->bd_part; |
764 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 | 765 | |
2e7910d6 | 766 | error = sysfs_create_link(fs_devices->device_dir_kobj, |
29e5be24 JM |
767 | disk_kobj, disk_kobj->name); |
768 | if (error) | |
769 | break; | |
770 | } | |
771 | ||
772 | return error; | |
773 | } | |
774 | ||
510d7360 JM |
775 | /* /sys/fs/btrfs/ entry */ |
776 | static struct kset *btrfs_kset; | |
777 | ||
1bae3098 DS |
778 | /* /sys/kernel/debug/btrfs */ |
779 | static struct dentry *btrfs_debugfs_root_dentry; | |
780 | ||
781 | /* Debugging tunables and exported data */ | |
782 | u64 btrfs_debugfs_test; | |
783 | ||
72059215 AJ |
784 | /* |
785 | * Can be called by the device discovery thread. | |
786 | * And parent can be specified for seed device | |
787 | */ | |
0c10e2d4 | 788 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, |
72059215 | 789 | struct kobject *parent) |
5ac1d209 JM |
790 | { |
791 | int error; | |
792 | ||
2e7910d6 | 793 | init_completion(&fs_devs->kobj_unregister); |
c1b7e474 AJ |
794 | fs_devs->fsid_kobj.kset = btrfs_kset; |
795 | error = kobject_init_and_add(&fs_devs->fsid_kobj, | |
24bd69cb | 796 | &btrfs_ktype, parent, "%pU", fs_devs->fsid); |
72059215 AJ |
797 | return error; |
798 | } | |
799 | ||
96f3136e | 800 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
72059215 AJ |
801 | { |
802 | int error; | |
2e7910d6 | 803 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e474 | 804 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
72059215 | 805 | |
5a13f430 AJ |
806 | btrfs_set_fs_info_ptr(fs_info); |
807 | ||
e3bd6973 | 808 | error = btrfs_sysfs_add_device_link(fs_devs, NULL); |
b7c35e81 | 809 | if (error) |
aaf13305 | 810 | return error; |
aaf13305 | 811 | |
c1b7e474 | 812 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989 | 813 | if (error) { |
32576040 | 814 | btrfs_sysfs_rm_device_link(fs_devs, NULL); |
e453d989 JM |
815 | return error; |
816 | } | |
79da4fa4 | 817 | |
c1b7e474 | 818 | error = sysfs_create_group(fsid_kobj, |
0dd2906f AJ |
819 | &btrfs_feature_attr_group); |
820 | if (error) | |
821 | goto failure; | |
822 | ||
e453d989 | 823 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
824 | if (error) |
825 | goto failure; | |
826 | ||
6ab0a202 | 827 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e474 | 828 | fsid_kobj); |
6ab0a202 JM |
829 | if (!fs_info->space_info_kobj) { |
830 | error = -ENOMEM; | |
831 | goto failure; | |
832 | } | |
833 | ||
834 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
835 | if (error) | |
836 | goto failure; | |
837 | ||
79da4fa4 JM |
838 | return 0; |
839 | failure: | |
6618a59b | 840 | btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209 JM |
841 | return error; |
842 | } | |
843 | ||
444e7516 DS |
844 | |
845 | /* | |
846 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
847 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
848 | */ | |
849 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, | |
850 | u64 bit, enum btrfs_feature_set set) | |
851 | { | |
852 | struct btrfs_fs_devices *fs_devs; | |
853 | struct kobject *fsid_kobj; | |
854 | u64 features; | |
855 | int ret; | |
856 | ||
857 | if (!fs_info) | |
858 | return; | |
859 | ||
860 | features = get_features(fs_info, set); | |
861 | ASSERT(bit & supported_feature_masks[set]); | |
862 | ||
863 | fs_devs = fs_info->fs_devices; | |
864 | fsid_kobj = &fs_devs->fsid_kobj; | |
865 | ||
bf609206 DS |
866 | if (!fsid_kobj->state_initialized) |
867 | return; | |
868 | ||
444e7516 DS |
869 | /* |
870 | * FIXME: this is too heavy to update just one value, ideally we'd like | |
871 | * to use sysfs_update_group but some refactoring is needed first. | |
872 | */ | |
873 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); | |
874 | ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); | |
875 | } | |
876 | ||
1bae3098 DS |
877 | static int btrfs_init_debugfs(void) |
878 | { | |
879 | #ifdef CONFIG_DEBUG_FS | |
880 | btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); | |
881 | if (!btrfs_debugfs_root_dentry) | |
882 | return -ENOMEM; | |
883 | ||
b0de6c4c DS |
884 | /* |
885 | * Example code, how to export data through debugfs. | |
886 | * | |
887 | * file: /sys/kernel/debug/btrfs/test | |
888 | * contents of: btrfs_debugfs_test | |
889 | */ | |
890 | #ifdef CONFIG_BTRFS_DEBUG | |
07f6a480 | 891 | debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, |
1bae3098 | 892 | &btrfs_debugfs_test); |
b0de6c4c DS |
893 | #endif |
894 | ||
1bae3098 DS |
895 | #endif |
896 | return 0; | |
897 | } | |
898 | ||
b214107e | 899 | int btrfs_init_sysfs(void) |
58176a96 | 900 | { |
079b72bc | 901 | int ret; |
1bae3098 | 902 | |
e3fe4e71 GKH |
903 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
904 | if (!btrfs_kset) | |
905 | return -ENOMEM; | |
079b72bc | 906 | |
1bae3098 DS |
907 | ret = btrfs_init_debugfs(); |
908 | if (ret) | |
001a648d | 909 | goto out1; |
79da4fa4 | 910 | |
1bae3098 | 911 | init_feature_attrs(); |
079b72bc | 912 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
913 | if (ret) |
914 | goto out2; | |
915 | ||
916 | return 0; | |
917 | out2: | |
918 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); | |
919 | out1: | |
920 | kset_unregister(btrfs_kset); | |
079b72bc | 921 | |
1bae3098 | 922 | return ret; |
58176a96 JB |
923 | } |
924 | ||
b214107e | 925 | void btrfs_exit_sysfs(void) |
58176a96 | 926 | { |
079b72bc | 927 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 928 | kset_unregister(btrfs_kset); |
1bae3098 | 929 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a96 | 930 | } |
55d47414 | 931 |