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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 | ||
ee611138 DS |
123 | if (fs_info->sb->s_flags & MS_RDONLY) |
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); | |
079b72bc JM |
203 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
204 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
205 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
206 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 207 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
3b5bb73b | 208 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
079b72bc JM |
209 | |
210 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
211 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
212 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
213 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
214 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
079b72bc JM |
215 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
216 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
217 | BTRFS_FEAT_ATTR_PTR(raid56), | |
218 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 219 | BTRFS_FEAT_ATTR_PTR(no_holes), |
3b5bb73b | 220 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
079b72bc JM |
221 | NULL |
222 | }; | |
223 | ||
224 | static const struct attribute_group btrfs_feature_attr_group = { | |
225 | .name = "features", | |
510d7360 | 226 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
227 | .attrs = btrfs_supported_feature_attrs, |
228 | }; | |
58176a96 | 229 | |
6ab0a202 JM |
230 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
231 | { | |
232 | u64 val; | |
233 | if (lock) | |
234 | spin_lock(lock); | |
235 | val = *value_ptr; | |
236 | if (lock) | |
237 | spin_unlock(lock); | |
238 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
239 | } | |
240 | ||
241 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
242 | struct kobj_attribute *ka, char *buf) | |
243 | { | |
244 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
245 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
246 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
247 | } | |
98b3d389 | 248 | BTRFS_ATTR(global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
249 | |
250 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
251 | struct kobj_attribute *a, char *buf) | |
252 | { | |
253 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
254 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
255 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
256 | } | |
98b3d389 | 257 | BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
258 | |
259 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 260 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
261 | |
262 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
263 | struct kobj_attribute *attr, char *buf); | |
264 | BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); | |
265 | BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); | |
266 | ||
267 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
268 | struct kobj_attribute *attr, char *buf) | |
269 | ||
270 | { | |
271 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
272 | struct btrfs_block_group_cache *block_group; | |
c1895442 | 273 | int index = to_raid_kobj(kobj)->raid_type; |
6ab0a202 JM |
274 | u64 val = 0; |
275 | ||
276 | down_read(&sinfo->groups_sem); | |
277 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
278 | if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) | |
279 | val += block_group->key.offset; | |
280 | else | |
281 | val += btrfs_block_group_used(&block_group->item); | |
282 | } | |
283 | up_read(&sinfo->groups_sem); | |
284 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
285 | } | |
286 | ||
287 | static struct attribute *raid_attributes[] = { | |
288 | BTRFS_RAID_ATTR_PTR(total_bytes), | |
289 | BTRFS_RAID_ATTR_PTR(used_bytes), | |
290 | NULL | |
291 | }; | |
292 | ||
293 | static void release_raid_kobj(struct kobject *kobj) | |
294 | { | |
c1895442 | 295 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
296 | } |
297 | ||
298 | struct kobj_type btrfs_raid_ktype = { | |
299 | .sysfs_ops = &kobj_sysfs_ops, | |
300 | .release = release_raid_kobj, | |
301 | .default_attrs = raid_attributes, | |
302 | }; | |
303 | ||
304 | #define SPACE_INFO_ATTR(field) \ | |
305 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
306 | struct kobj_attribute *a, \ | |
307 | char *buf) \ | |
308 | { \ | |
309 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
310 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
311 | } \ | |
98b3d389 | 312 | BTRFS_ATTR(field, btrfs_space_info_show_##field) |
6ab0a202 JM |
313 | |
314 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
315 | struct kobj_attribute *a, | |
316 | char *buf) | |
317 | { | |
318 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
319 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
320 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
321 | } | |
322 | ||
323 | SPACE_INFO_ATTR(flags); | |
324 | SPACE_INFO_ATTR(total_bytes); | |
325 | SPACE_INFO_ATTR(bytes_used); | |
326 | SPACE_INFO_ATTR(bytes_pinned); | |
327 | SPACE_INFO_ATTR(bytes_reserved); | |
328 | SPACE_INFO_ATTR(bytes_may_use); | |
c1fd5c30 | 329 | SPACE_INFO_ATTR(bytes_readonly); |
6ab0a202 JM |
330 | SPACE_INFO_ATTR(disk_used); |
331 | SPACE_INFO_ATTR(disk_total); | |
98b3d389 | 332 | BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); |
6ab0a202 JM |
333 | |
334 | static struct attribute *space_info_attrs[] = { | |
335 | BTRFS_ATTR_PTR(flags), | |
336 | BTRFS_ATTR_PTR(total_bytes), | |
337 | BTRFS_ATTR_PTR(bytes_used), | |
338 | BTRFS_ATTR_PTR(bytes_pinned), | |
339 | BTRFS_ATTR_PTR(bytes_reserved), | |
340 | BTRFS_ATTR_PTR(bytes_may_use), | |
c1fd5c30 | 341 | BTRFS_ATTR_PTR(bytes_readonly), |
6ab0a202 JM |
342 | BTRFS_ATTR_PTR(disk_used), |
343 | BTRFS_ATTR_PTR(disk_total), | |
344 | BTRFS_ATTR_PTR(total_bytes_pinned), | |
345 | NULL, | |
346 | }; | |
347 | ||
348 | static void space_info_release(struct kobject *kobj) | |
349 | { | |
350 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
351 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
352 | kfree(sinfo); | |
353 | } | |
354 | ||
355 | struct kobj_type space_info_ktype = { | |
356 | .sysfs_ops = &kobj_sysfs_ops, | |
357 | .release = space_info_release, | |
358 | .default_attrs = space_info_attrs, | |
359 | }; | |
360 | ||
361 | static const struct attribute *allocation_attrs[] = { | |
362 | BTRFS_ATTR_PTR(global_rsv_reserved), | |
363 | BTRFS_ATTR_PTR(global_rsv_size), | |
364 | NULL, | |
365 | }; | |
366 | ||
f8ba9c11 JM |
367 | static ssize_t btrfs_label_show(struct kobject *kobj, |
368 | struct kobj_attribute *a, char *buf) | |
369 | { | |
370 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 371 | char *label = fs_info->super_copy->label; |
ee17fc80 DS |
372 | ssize_t ret; |
373 | ||
374 | spin_lock(&fs_info->super_lock); | |
375 | ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); | |
376 | spin_unlock(&fs_info->super_lock); | |
377 | ||
378 | return ret; | |
f8ba9c11 JM |
379 | } |
380 | ||
381 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
382 | struct kobj_attribute *a, | |
383 | const char *buf, size_t len) | |
384 | { | |
385 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 386 | size_t p_len; |
f8ba9c11 | 387 | |
66ac9fe7 DS |
388 | if (!fs_info) |
389 | return -EPERM; | |
390 | ||
79aec2b8 AJ |
391 | if (fs_info->sb->s_flags & MS_RDONLY) |
392 | return -EROFS; | |
393 | ||
48fcc3ff ST |
394 | /* |
395 | * p_len is the len until the first occurrence of either | |
396 | * '\n' or '\0' | |
397 | */ | |
398 | p_len = strcspn(buf, "\n"); | |
399 | ||
400 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 401 | return -EINVAL; |
f8ba9c11 | 402 | |
a6f69dc8 | 403 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
404 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
405 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 406 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 407 | |
a6f69dc8 DS |
408 | /* |
409 | * We don't want to do full transaction commit from inside sysfs | |
410 | */ | |
411 | btrfs_set_pending(fs_info, COMMIT); | |
412 | wake_up_process(fs_info->transaction_kthread); | |
f8ba9c11 | 413 | |
a6f69dc8 | 414 | return len; |
f8ba9c11 | 415 | } |
20ee0825 | 416 | BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 417 | |
df93589a DS |
418 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
419 | struct kobj_attribute *a, char *buf) | |
420 | { | |
421 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
422 | ||
423 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); | |
424 | } | |
425 | ||
98b3d389 | 426 | BTRFS_ATTR(nodesize, btrfs_nodesize_show); |
df93589a DS |
427 | |
428 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
429 | struct kobj_attribute *a, char *buf) | |
430 | { | |
431 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
432 | ||
5d163e0e JM |
433 | return snprintf(buf, PAGE_SIZE, "%u\n", |
434 | fs_info->super_copy->sectorsize); | |
df93589a DS |
435 | } |
436 | ||
98b3d389 | 437 | BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); |
df93589a DS |
438 | |
439 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
440 | struct kobj_attribute *a, char *buf) | |
441 | { | |
442 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
443 | ||
5d163e0e JM |
444 | return snprintf(buf, PAGE_SIZE, "%u\n", |
445 | fs_info->super_copy->sectorsize); | |
df93589a DS |
446 | } |
447 | ||
98b3d389 | 448 | BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); |
df93589a | 449 | |
2723480a SD |
450 | static ssize_t quota_override_show(struct kobject *kobj, |
451 | struct kobj_attribute *a, char *buf) | |
452 | { | |
453 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
454 | int quota_override; | |
455 | ||
456 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
457 | return snprintf(buf, PAGE_SIZE, "%d\n", quota_override); | |
458 | } | |
459 | ||
460 | static ssize_t quota_override_store(struct kobject *kobj, | |
461 | struct kobj_attribute *a, | |
462 | const char *buf, size_t len) | |
463 | { | |
464 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
465 | unsigned long knob; | |
466 | int err; | |
467 | ||
468 | if (!fs_info) | |
469 | return -EPERM; | |
470 | ||
471 | if (!capable(CAP_SYS_RESOURCE)) | |
472 | return -EPERM; | |
473 | ||
474 | err = kstrtoul(buf, 10, &knob); | |
475 | if (err) | |
476 | return err; | |
477 | if (knob > 1) | |
478 | return -EINVAL; | |
479 | ||
480 | if (knob) | |
481 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
482 | else | |
483 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
484 | ||
485 | return len; | |
486 | } | |
487 | ||
488 | BTRFS_ATTR_RW(quota_override, quota_override_show, quota_override_store); | |
489 | ||
0dd2906f | 490 | static const struct attribute *btrfs_attrs[] = { |
f8ba9c11 | 491 | BTRFS_ATTR_PTR(label), |
df93589a DS |
492 | BTRFS_ATTR_PTR(nodesize), |
493 | BTRFS_ATTR_PTR(sectorsize), | |
494 | BTRFS_ATTR_PTR(clone_alignment), | |
2723480a | 495 | BTRFS_ATTR_PTR(quota_override), |
f8ba9c11 JM |
496 | NULL, |
497 | }; | |
498 | ||
c1b7e474 | 499 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
510d7360 | 500 | { |
2e7910d6 | 501 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
248d200d | 502 | |
c1b7e474 | 503 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
2e7910d6 | 504 | complete(&fs_devs->kobj_unregister); |
510d7360 JM |
505 | } |
506 | ||
507 | static struct kobj_type btrfs_ktype = { | |
508 | .sysfs_ops = &kobj_sysfs_ops, | |
c1b7e474 | 509 | .release = btrfs_release_fsid_kobj, |
510d7360 JM |
510 | }; |
511 | ||
2e7910d6 AJ |
512 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
513 | { | |
514 | if (kobj->ktype != &btrfs_ktype) | |
515 | return NULL; | |
c1b7e474 | 516 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
2e7910d6 AJ |
517 | } |
518 | ||
510d7360 JM |
519 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
520 | { | |
521 | if (kobj->ktype != &btrfs_ktype) | |
522 | return NULL; | |
2e7910d6 | 523 | return to_fs_devs(kobj)->fs_info; |
510d7360 | 524 | } |
58176a96 | 525 | |
e453d989 JM |
526 | #define NUM_FEATURE_BITS 64 |
527 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
528 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
529 | ||
e8c9f186 | 530 | static const u64 supported_feature_masks[3] = { |
e453d989 JM |
531 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
532 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
533 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
534 | }; | |
535 | ||
536 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
537 | { | |
538 | int set; | |
539 | ||
540 | for (set = 0; set < FEAT_MAX; set++) { | |
541 | int i; | |
542 | struct attribute *attrs[2]; | |
543 | struct attribute_group agroup = { | |
544 | .name = "features", | |
545 | .attrs = attrs, | |
546 | }; | |
547 | u64 features = get_features(fs_info, set); | |
548 | features &= ~supported_feature_masks[set]; | |
549 | ||
550 | if (!features) | |
551 | continue; | |
552 | ||
553 | attrs[1] = NULL; | |
554 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
555 | struct btrfs_feature_attr *fa; | |
556 | ||
557 | if (!(features & (1ULL << i))) | |
558 | continue; | |
559 | ||
560 | fa = &btrfs_feature_attrs[set][i]; | |
561 | attrs[0] = &fa->kobj_attr.attr; | |
562 | if (add) { | |
563 | int ret; | |
c1b7e474 | 564 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
565 | &agroup); |
566 | if (ret) | |
567 | return ret; | |
568 | } else | |
c1b7e474 | 569 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
570 | &agroup); |
571 | } | |
572 | ||
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
2e3e1281 | 577 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 | 578 | { |
2e7910d6 AJ |
579 | if (fs_devs->device_dir_kobj) { |
580 | kobject_del(fs_devs->device_dir_kobj); | |
581 | kobject_put(fs_devs->device_dir_kobj); | |
582 | fs_devs->device_dir_kobj = NULL; | |
aaf13305 AJ |
583 | } |
584 | ||
c1b7e474 AJ |
585 | if (fs_devs->fsid_kobj.state_initialized) { |
586 | kobject_del(&fs_devs->fsid_kobj); | |
587 | kobject_put(&fs_devs->fsid_kobj); | |
f90fc547 AJ |
588 | wait_for_completion(&fs_devs->kobj_unregister); |
589 | } | |
5ac1d209 JM |
590 | } |
591 | ||
2e3e1281 | 592 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1d1c1be3 | 593 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
2e3e1281 AJ |
594 | { |
595 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
596 | ||
597 | if (fs_devs) { | |
598 | __btrfs_sysfs_remove_fsid(fs_devs); | |
599 | return; | |
600 | } | |
601 | ||
602 | list_for_each_entry(fs_devs, fs_uuids, list) { | |
603 | __btrfs_sysfs_remove_fsid(fs_devs); | |
604 | } | |
605 | } | |
606 | ||
6618a59b | 607 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
e453d989 | 608 | { |
5a13f430 AJ |
609 | btrfs_reset_fs_info_ptr(fs_info); |
610 | ||
e453d989 JM |
611 | if (fs_info->space_info_kobj) { |
612 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
613 | kobject_del(fs_info->space_info_kobj); | |
614 | kobject_put(fs_info->space_info_kobj); | |
615 | } | |
e453d989 | 616 | addrm_unknown_feature_attrs(fs_info, false); |
c1b7e474 AJ |
617 | sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); |
618 | sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); | |
32576040 | 619 | btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL); |
e453d989 JM |
620 | } |
621 | ||
79da4fa4 JM |
622 | const char * const btrfs_feature_set_names[3] = { |
623 | [FEAT_COMPAT] = "compat", | |
624 | [FEAT_COMPAT_RO] = "compat_ro", | |
625 | [FEAT_INCOMPAT] = "incompat", | |
626 | }; | |
627 | ||
3b02a68a JM |
628 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
629 | { | |
630 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
631 | int len = 0; | |
632 | int i; | |
633 | char *str; | |
634 | ||
635 | str = kmalloc(bufsize, GFP_KERNEL); | |
636 | if (!str) | |
637 | return str; | |
638 | ||
639 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
640 | const char *name; | |
641 | ||
642 | if (!(flags & (1ULL << i))) | |
643 | continue; | |
644 | ||
645 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
646 | len += snprintf(str + len, bufsize - len, "%s%s", | |
647 | len ? "," : "", name); | |
648 | } | |
649 | ||
650 | return str; | |
651 | } | |
652 | ||
79da4fa4 JM |
653 | static void init_feature_attrs(void) |
654 | { | |
655 | struct btrfs_feature_attr *fa; | |
656 | int set, i; | |
657 | ||
658 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
659 | ARRAY_SIZE(btrfs_feature_attrs)); | |
660 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
661 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
662 | ||
3b02a68a JM |
663 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
664 | memset(btrfs_unknown_feature_names, 0, | |
665 | sizeof(btrfs_unknown_feature_names)); | |
666 | ||
79da4fa4 JM |
667 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
668 | struct btrfs_feature_attr *sfa; | |
669 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 670 | int bit; |
79da4fa4 | 671 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
672 | bit = ilog2(sfa->feature_bit); |
673 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
674 | |
675 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
676 | } | |
677 | ||
678 | for (set = 0; set < FEAT_MAX; set++) { | |
679 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
680 | char *name = btrfs_unknown_feature_names[set][i]; | |
681 | fa = &btrfs_feature_attrs[set][i]; | |
682 | ||
683 | if (fa->kobj_attr.attr.name) | |
684 | continue; | |
685 | ||
686 | snprintf(name, 13, "%s:%u", | |
687 | btrfs_feature_set_names[set], i); | |
688 | ||
689 | fa->kobj_attr.attr.name = name; | |
690 | fa->kobj_attr.attr.mode = S_IRUGO; | |
691 | fa->feature_set = set; | |
692 | fa->feature_bit = 1ULL << i; | |
693 | } | |
694 | } | |
695 | } | |
696 | ||
e7e1aa9c AJ |
697 | /* when one_device is NULL, it removes all device links */ |
698 | ||
32576040 | 699 | int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices, |
99994cde AJ |
700 | struct btrfs_device *one_device) |
701 | { | |
702 | struct hd_struct *disk; | |
703 | struct kobject *disk_kobj; | |
704 | ||
6c14a164 | 705 | if (!fs_devices->device_dir_kobj) |
99994cde AJ |
706 | return -EINVAL; |
707 | ||
87fa3bb0 | 708 | if (one_device && one_device->bdev) { |
99994cde AJ |
709 | disk = one_device->bdev->bd_part; |
710 | disk_kobj = &part_to_dev(disk)->kobj; | |
711 | ||
6c14a164 | 712 | sysfs_remove_link(fs_devices->device_dir_kobj, |
99994cde AJ |
713 | disk_kobj->name); |
714 | } | |
715 | ||
e7e1aa9c AJ |
716 | if (one_device) |
717 | return 0; | |
718 | ||
719 | list_for_each_entry(one_device, | |
6c14a164 | 720 | &fs_devices->devices, dev_list) { |
e7e1aa9c AJ |
721 | if (!one_device->bdev) |
722 | continue; | |
723 | disk = one_device->bdev->bd_part; | |
724 | disk_kobj = &part_to_dev(disk)->kobj; | |
725 | ||
6c14a164 | 726 | sysfs_remove_link(fs_devices->device_dir_kobj, |
e7e1aa9c AJ |
727 | disk_kobj->name); |
728 | } | |
729 | ||
99994cde AJ |
730 | return 0; |
731 | } | |
732 | ||
2e7910d6 | 733 | int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs) |
29e5be24 | 734 | { |
2e7910d6 AJ |
735 | if (!fs_devs->device_dir_kobj) |
736 | fs_devs->device_dir_kobj = kobject_create_and_add("devices", | |
c1b7e474 | 737 | &fs_devs->fsid_kobj); |
0d39376a | 738 | |
2e7910d6 | 739 | if (!fs_devs->device_dir_kobj) |
29e5be24 JM |
740 | return -ENOMEM; |
741 | ||
00c921c2 AJ |
742 | return 0; |
743 | } | |
744 | ||
e3bd6973 | 745 | int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices, |
1ba43816 | 746 | struct btrfs_device *one_device) |
00c921c2 AJ |
747 | { |
748 | int error = 0; | |
00c921c2 AJ |
749 | struct btrfs_device *dev; |
750 | ||
29e5be24 | 751 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { |
f085381e AJ |
752 | struct hd_struct *disk; |
753 | struct kobject *disk_kobj; | |
754 | ||
755 | if (!dev->bdev) | |
756 | continue; | |
757 | ||
0d39376a AJ |
758 | if (one_device && one_device != dev) |
759 | continue; | |
760 | ||
f085381e AJ |
761 | disk = dev->bdev->bd_part; |
762 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 | 763 | |
2e7910d6 | 764 | error = sysfs_create_link(fs_devices->device_dir_kobj, |
29e5be24 JM |
765 | disk_kobj, disk_kobj->name); |
766 | if (error) | |
767 | break; | |
768 | } | |
769 | ||
770 | return error; | |
771 | } | |
772 | ||
510d7360 JM |
773 | /* /sys/fs/btrfs/ entry */ |
774 | static struct kset *btrfs_kset; | |
775 | ||
1bae3098 DS |
776 | /* /sys/kernel/debug/btrfs */ |
777 | static struct dentry *btrfs_debugfs_root_dentry; | |
778 | ||
779 | /* Debugging tunables and exported data */ | |
780 | u64 btrfs_debugfs_test; | |
781 | ||
72059215 AJ |
782 | /* |
783 | * Can be called by the device discovery thread. | |
784 | * And parent can be specified for seed device | |
785 | */ | |
0c10e2d4 | 786 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs, |
72059215 | 787 | struct kobject *parent) |
5ac1d209 JM |
788 | { |
789 | int error; | |
790 | ||
2e7910d6 | 791 | init_completion(&fs_devs->kobj_unregister); |
c1b7e474 AJ |
792 | fs_devs->fsid_kobj.kset = btrfs_kset; |
793 | error = kobject_init_and_add(&fs_devs->fsid_kobj, | |
24bd69cb | 794 | &btrfs_ktype, parent, "%pU", fs_devs->fsid); |
72059215 AJ |
795 | return error; |
796 | } | |
797 | ||
96f3136e | 798 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
72059215 AJ |
799 | { |
800 | int error; | |
2e7910d6 | 801 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e474 | 802 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
72059215 | 803 | |
5a13f430 AJ |
804 | btrfs_set_fs_info_ptr(fs_info); |
805 | ||
e3bd6973 | 806 | error = btrfs_sysfs_add_device_link(fs_devs, NULL); |
b7c35e81 | 807 | if (error) |
aaf13305 | 808 | return error; |
aaf13305 | 809 | |
c1b7e474 | 810 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989 | 811 | if (error) { |
32576040 | 812 | btrfs_sysfs_rm_device_link(fs_devs, NULL); |
e453d989 JM |
813 | return error; |
814 | } | |
79da4fa4 | 815 | |
c1b7e474 | 816 | error = sysfs_create_group(fsid_kobj, |
0dd2906f AJ |
817 | &btrfs_feature_attr_group); |
818 | if (error) | |
819 | goto failure; | |
820 | ||
e453d989 | 821 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
822 | if (error) |
823 | goto failure; | |
824 | ||
6ab0a202 | 825 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e474 | 826 | fsid_kobj); |
6ab0a202 JM |
827 | if (!fs_info->space_info_kobj) { |
828 | error = -ENOMEM; | |
829 | goto failure; | |
830 | } | |
831 | ||
832 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
833 | if (error) | |
834 | goto failure; | |
835 | ||
79da4fa4 JM |
836 | return 0; |
837 | failure: | |
6618a59b | 838 | btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209 JM |
839 | return error; |
840 | } | |
841 | ||
444e7516 DS |
842 | |
843 | /* | |
844 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
845 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
846 | */ | |
847 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info, | |
848 | u64 bit, enum btrfs_feature_set set) | |
849 | { | |
850 | struct btrfs_fs_devices *fs_devs; | |
851 | struct kobject *fsid_kobj; | |
852 | u64 features; | |
853 | int ret; | |
854 | ||
855 | if (!fs_info) | |
856 | return; | |
857 | ||
858 | features = get_features(fs_info, set); | |
859 | ASSERT(bit & supported_feature_masks[set]); | |
860 | ||
861 | fs_devs = fs_info->fs_devices; | |
862 | fsid_kobj = &fs_devs->fsid_kobj; | |
863 | ||
bf609206 DS |
864 | if (!fsid_kobj->state_initialized) |
865 | return; | |
866 | ||
444e7516 DS |
867 | /* |
868 | * FIXME: this is too heavy to update just one value, ideally we'd like | |
869 | * to use sysfs_update_group but some refactoring is needed first. | |
870 | */ | |
871 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); | |
872 | ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group); | |
873 | } | |
874 | ||
1bae3098 DS |
875 | static int btrfs_init_debugfs(void) |
876 | { | |
877 | #ifdef CONFIG_DEBUG_FS | |
878 | btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); | |
879 | if (!btrfs_debugfs_root_dentry) | |
880 | return -ENOMEM; | |
881 | ||
b0de6c4c DS |
882 | /* |
883 | * Example code, how to export data through debugfs. | |
884 | * | |
885 | * file: /sys/kernel/debug/btrfs/test | |
886 | * contents of: btrfs_debugfs_test | |
887 | */ | |
888 | #ifdef CONFIG_BTRFS_DEBUG | |
07f6a480 | 889 | debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry, |
1bae3098 | 890 | &btrfs_debugfs_test); |
b0de6c4c DS |
891 | #endif |
892 | ||
1bae3098 DS |
893 | #endif |
894 | return 0; | |
895 | } | |
896 | ||
b214107e | 897 | int btrfs_init_sysfs(void) |
58176a96 | 898 | { |
079b72bc | 899 | int ret; |
1bae3098 | 900 | |
e3fe4e71 GKH |
901 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
902 | if (!btrfs_kset) | |
903 | return -ENOMEM; | |
079b72bc | 904 | |
1bae3098 DS |
905 | ret = btrfs_init_debugfs(); |
906 | if (ret) | |
001a648d | 907 | goto out1; |
79da4fa4 | 908 | |
1bae3098 | 909 | init_feature_attrs(); |
079b72bc | 910 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
911 | if (ret) |
912 | goto out2; | |
913 | ||
914 | return 0; | |
915 | out2: | |
916 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); | |
917 | out1: | |
918 | kset_unregister(btrfs_kset); | |
079b72bc | 919 | |
1bae3098 | 920 | return ret; |
58176a96 JB |
921 | } |
922 | ||
b214107e | 923 | void btrfs_exit_sysfs(void) |
58176a96 | 924 | { |
079b72bc | 925 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 926 | kset_unregister(btrfs_kset); |
1bae3098 | 927 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a96 | 928 | } |
55d47414 | 929 |