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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); |
5ac1d209 | 36 | |
510d7360 JM |
37 | static u64 get_features(struct btrfs_fs_info *fs_info, |
38 | enum btrfs_feature_set set) | |
5ac1d209 | 39 | { |
510d7360 JM |
40 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
41 | if (set == FEAT_COMPAT) | |
42 | return btrfs_super_compat_flags(disk_super); | |
43 | else if (set == FEAT_COMPAT_RO) | |
44 | return btrfs_super_compat_ro_flags(disk_super); | |
45 | else | |
46 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
47 | } |
48 | ||
ba631941 JM |
49 | static void set_features(struct btrfs_fs_info *fs_info, |
50 | enum btrfs_feature_set set, u64 features) | |
51 | { | |
52 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
53 | if (set == FEAT_COMPAT) | |
54 | btrfs_set_super_compat_flags(disk_super, features); | |
55 | else if (set == FEAT_COMPAT_RO) | |
56 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
57 | else | |
58 | btrfs_set_super_incompat_flags(disk_super, features); | |
59 | } | |
60 | ||
61 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
62 | { | |
63 | int val = 0; | |
64 | u64 set, clear; | |
65 | switch (fa->feature_set) { | |
66 | case FEAT_COMPAT: | |
67 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
68 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
69 | break; | |
70 | case FEAT_COMPAT_RO: | |
71 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
72 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
73 | break; | |
74 | case FEAT_INCOMPAT: | |
75 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
76 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
77 | break; | |
78 | default: | |
cc37bb04 DS |
79 | printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", |
80 | fa->feature_set); | |
81 | return 0; | |
ba631941 JM |
82 | } |
83 | ||
84 | if (set & fa->feature_bit) | |
85 | val |= 1; | |
86 | if (clear & fa->feature_bit) | |
87 | val |= 2; | |
88 | ||
89 | return val; | |
90 | } | |
91 | ||
510d7360 JM |
92 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
93 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 94 | { |
510d7360 | 95 | int val = 0; |
5ac1d209 | 96 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 97 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 98 | if (fs_info) { |
510d7360 JM |
99 | u64 features = get_features(fs_info, fa->feature_set); |
100 | if (features & fa->feature_bit) | |
101 | val = 1; | |
ba631941 JM |
102 | } else |
103 | val = can_modify_feature(fa); | |
510d7360 JM |
104 | |
105 | return snprintf(buf, PAGE_SIZE, "%d\n", val); | |
5ac1d209 JM |
106 | } |
107 | ||
ba631941 JM |
108 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
109 | struct kobj_attribute *a, | |
110 | const char *buf, size_t count) | |
111 | { | |
112 | struct btrfs_fs_info *fs_info; | |
113 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
ba631941 JM |
114 | u64 features, set, clear; |
115 | unsigned long val; | |
116 | int ret; | |
117 | ||
118 | fs_info = to_fs_info(kobj); | |
119 | if (!fs_info) | |
120 | return -EPERM; | |
121 | ||
122 | ret = kstrtoul(skip_spaces(buf), 0, &val); | |
123 | if (ret) | |
124 | return ret; | |
125 | ||
126 | if (fa->feature_set == FEAT_COMPAT) { | |
127 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
128 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
129 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
130 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
131 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
132 | } else { | |
133 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
134 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
135 | } | |
136 | ||
137 | features = get_features(fs_info, fa->feature_set); | |
138 | ||
139 | /* Nothing to do */ | |
140 | if ((val && (features & fa->feature_bit)) || | |
141 | (!val && !(features & fa->feature_bit))) | |
142 | return count; | |
143 | ||
144 | if ((val && !(set & fa->feature_bit)) || | |
145 | (!val && !(clear & fa->feature_bit))) { | |
146 | btrfs_info(fs_info, | |
147 | "%sabling feature %s on mounted fs is not supported.", | |
148 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
149 | return -EPERM; | |
150 | } | |
151 | ||
152 | btrfs_info(fs_info, "%s %s feature flag", | |
153 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
154 | ||
ba631941 JM |
155 | spin_lock(&fs_info->super_lock); |
156 | features = get_features(fs_info, fa->feature_set); | |
157 | if (val) | |
158 | features |= fa->feature_bit; | |
159 | else | |
160 | features &= ~fa->feature_bit; | |
161 | set_features(fs_info, fa->feature_set, features); | |
162 | spin_unlock(&fs_info->super_lock); | |
163 | ||
0eae2747 DS |
164 | /* |
165 | * We don't want to do full transaction commit from inside sysfs | |
166 | */ | |
167 | btrfs_set_pending(fs_info, COMMIT); | |
168 | wake_up_process(fs_info->transaction_kthread); | |
ba631941 JM |
169 | |
170 | return count; | |
171 | } | |
172 | ||
510d7360 JM |
173 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
174 | struct attribute *attr, int unused) | |
079b72bc | 175 | { |
510d7360 JM |
176 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
177 | umode_t mode = attr->mode; | |
178 | ||
179 | if (fs_info) { | |
180 | struct btrfs_feature_attr *fa; | |
181 | u64 features; | |
182 | ||
183 | fa = attr_to_btrfs_feature_attr(attr); | |
184 | features = get_features(fs_info, fa->feature_set); | |
185 | ||
ba631941 JM |
186 | if (can_modify_feature(fa)) |
187 | mode |= S_IWUSR; | |
188 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
189 | mode = 0; |
190 | } | |
191 | ||
192 | return mode; | |
079b72bc JM |
193 | } |
194 | ||
195 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
196 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
197 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
198 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
079b72bc JM |
199 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
200 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
201 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
202 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 203 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
079b72bc JM |
204 | |
205 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
206 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
207 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
208 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
209 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
079b72bc JM |
210 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
211 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
212 | BTRFS_FEAT_ATTR_PTR(raid56), | |
213 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 214 | BTRFS_FEAT_ATTR_PTR(no_holes), |
079b72bc JM |
215 | NULL |
216 | }; | |
217 | ||
218 | static const struct attribute_group btrfs_feature_attr_group = { | |
219 | .name = "features", | |
510d7360 | 220 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
221 | .attrs = btrfs_supported_feature_attrs, |
222 | }; | |
58176a96 | 223 | |
6ab0a202 JM |
224 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
225 | { | |
226 | u64 val; | |
227 | if (lock) | |
228 | spin_lock(lock); | |
229 | val = *value_ptr; | |
230 | if (lock) | |
231 | spin_unlock(lock); | |
232 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
233 | } | |
234 | ||
235 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
236 | struct kobj_attribute *ka, char *buf) | |
237 | { | |
238 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
239 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
240 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
241 | } | |
98b3d389 | 242 | BTRFS_ATTR(global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
243 | |
244 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
245 | struct kobj_attribute *a, char *buf) | |
246 | { | |
247 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
248 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
249 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
250 | } | |
98b3d389 | 251 | BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
252 | |
253 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 254 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
255 | |
256 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
257 | struct kobj_attribute *attr, char *buf); | |
258 | BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); | |
259 | BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); | |
260 | ||
261 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
262 | struct kobj_attribute *attr, char *buf) | |
263 | ||
264 | { | |
265 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
266 | struct btrfs_block_group_cache *block_group; | |
c1895442 | 267 | int index = to_raid_kobj(kobj)->raid_type; |
6ab0a202 JM |
268 | u64 val = 0; |
269 | ||
270 | down_read(&sinfo->groups_sem); | |
271 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
272 | if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) | |
273 | val += block_group->key.offset; | |
274 | else | |
275 | val += btrfs_block_group_used(&block_group->item); | |
276 | } | |
277 | up_read(&sinfo->groups_sem); | |
278 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
279 | } | |
280 | ||
281 | static struct attribute *raid_attributes[] = { | |
282 | BTRFS_RAID_ATTR_PTR(total_bytes), | |
283 | BTRFS_RAID_ATTR_PTR(used_bytes), | |
284 | NULL | |
285 | }; | |
286 | ||
287 | static void release_raid_kobj(struct kobject *kobj) | |
288 | { | |
c1895442 | 289 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
290 | } |
291 | ||
292 | struct kobj_type btrfs_raid_ktype = { | |
293 | .sysfs_ops = &kobj_sysfs_ops, | |
294 | .release = release_raid_kobj, | |
295 | .default_attrs = raid_attributes, | |
296 | }; | |
297 | ||
298 | #define SPACE_INFO_ATTR(field) \ | |
299 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
300 | struct kobj_attribute *a, \ | |
301 | char *buf) \ | |
302 | { \ | |
303 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
304 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
305 | } \ | |
98b3d389 | 306 | BTRFS_ATTR(field, btrfs_space_info_show_##field) |
6ab0a202 JM |
307 | |
308 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
309 | struct kobj_attribute *a, | |
310 | char *buf) | |
311 | { | |
312 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
313 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
314 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
315 | } | |
316 | ||
317 | SPACE_INFO_ATTR(flags); | |
318 | SPACE_INFO_ATTR(total_bytes); | |
319 | SPACE_INFO_ATTR(bytes_used); | |
320 | SPACE_INFO_ATTR(bytes_pinned); | |
321 | SPACE_INFO_ATTR(bytes_reserved); | |
322 | SPACE_INFO_ATTR(bytes_may_use); | |
323 | SPACE_INFO_ATTR(disk_used); | |
324 | SPACE_INFO_ATTR(disk_total); | |
98b3d389 | 325 | BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned); |
6ab0a202 JM |
326 | |
327 | static struct attribute *space_info_attrs[] = { | |
328 | BTRFS_ATTR_PTR(flags), | |
329 | BTRFS_ATTR_PTR(total_bytes), | |
330 | BTRFS_ATTR_PTR(bytes_used), | |
331 | BTRFS_ATTR_PTR(bytes_pinned), | |
332 | BTRFS_ATTR_PTR(bytes_reserved), | |
333 | BTRFS_ATTR_PTR(bytes_may_use), | |
334 | BTRFS_ATTR_PTR(disk_used), | |
335 | BTRFS_ATTR_PTR(disk_total), | |
336 | BTRFS_ATTR_PTR(total_bytes_pinned), | |
337 | NULL, | |
338 | }; | |
339 | ||
340 | static void space_info_release(struct kobject *kobj) | |
341 | { | |
342 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
343 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
344 | kfree(sinfo); | |
345 | } | |
346 | ||
347 | struct kobj_type space_info_ktype = { | |
348 | .sysfs_ops = &kobj_sysfs_ops, | |
349 | .release = space_info_release, | |
350 | .default_attrs = space_info_attrs, | |
351 | }; | |
352 | ||
353 | static const struct attribute *allocation_attrs[] = { | |
354 | BTRFS_ATTR_PTR(global_rsv_reserved), | |
355 | BTRFS_ATTR_PTR(global_rsv_size), | |
356 | NULL, | |
357 | }; | |
358 | ||
f8ba9c11 JM |
359 | static ssize_t btrfs_label_show(struct kobject *kobj, |
360 | struct kobj_attribute *a, char *buf) | |
361 | { | |
362 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff ST |
363 | char *label = fs_info->super_copy->label; |
364 | return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label); | |
f8ba9c11 JM |
365 | } |
366 | ||
367 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
368 | struct kobj_attribute *a, | |
369 | const char *buf, size_t len) | |
370 | { | |
371 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 372 | size_t p_len; |
f8ba9c11 | 373 | |
79aec2b8 AJ |
374 | if (fs_info->sb->s_flags & MS_RDONLY) |
375 | return -EROFS; | |
376 | ||
48fcc3ff ST |
377 | /* |
378 | * p_len is the len until the first occurrence of either | |
379 | * '\n' or '\0' | |
380 | */ | |
381 | p_len = strcspn(buf, "\n"); | |
382 | ||
383 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 384 | return -EINVAL; |
f8ba9c11 | 385 | |
a6f69dc8 | 386 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
387 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
388 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 389 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 390 | |
a6f69dc8 DS |
391 | /* |
392 | * We don't want to do full transaction commit from inside sysfs | |
393 | */ | |
394 | btrfs_set_pending(fs_info, COMMIT); | |
395 | wake_up_process(fs_info->transaction_kthread); | |
f8ba9c11 | 396 | |
a6f69dc8 | 397 | return len; |
f8ba9c11 | 398 | } |
20ee0825 | 399 | BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 400 | |
df93589a DS |
401 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
402 | struct kobj_attribute *a, char *buf) | |
403 | { | |
404 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
405 | ||
406 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); | |
407 | } | |
408 | ||
98b3d389 | 409 | BTRFS_ATTR(nodesize, btrfs_nodesize_show); |
df93589a DS |
410 | |
411 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
412 | struct kobj_attribute *a, char *buf) | |
413 | { | |
414 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
415 | ||
416 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); | |
417 | } | |
418 | ||
98b3d389 | 419 | BTRFS_ATTR(sectorsize, btrfs_sectorsize_show); |
df93589a DS |
420 | |
421 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
422 | struct kobj_attribute *a, char *buf) | |
423 | { | |
424 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
425 | ||
426 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); | |
427 | } | |
428 | ||
98b3d389 | 429 | BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show); |
df93589a | 430 | |
f8ba9c11 JM |
431 | static struct attribute *btrfs_attrs[] = { |
432 | BTRFS_ATTR_PTR(label), | |
df93589a DS |
433 | BTRFS_ATTR_PTR(nodesize), |
434 | BTRFS_ATTR_PTR(sectorsize), | |
435 | BTRFS_ATTR_PTR(clone_alignment), | |
f8ba9c11 JM |
436 | NULL, |
437 | }; | |
438 | ||
510d7360 JM |
439 | static void btrfs_release_super_kobj(struct kobject *kobj) |
440 | { | |
441 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
442 | complete(&fs_info->kobj_unregister); | |
443 | } | |
444 | ||
445 | static struct kobj_type btrfs_ktype = { | |
446 | .sysfs_ops = &kobj_sysfs_ops, | |
447 | .release = btrfs_release_super_kobj, | |
f8ba9c11 | 448 | .default_attrs = btrfs_attrs, |
510d7360 JM |
449 | }; |
450 | ||
451 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) | |
452 | { | |
453 | if (kobj->ktype != &btrfs_ktype) | |
454 | return NULL; | |
455 | return container_of(kobj, struct btrfs_fs_info, super_kobj); | |
456 | } | |
58176a96 | 457 | |
e453d989 JM |
458 | #define NUM_FEATURE_BITS 64 |
459 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
460 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
461 | ||
462 | static u64 supported_feature_masks[3] = { | |
463 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, | |
464 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
465 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
466 | }; | |
467 | ||
468 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
469 | { | |
470 | int set; | |
471 | ||
472 | for (set = 0; set < FEAT_MAX; set++) { | |
473 | int i; | |
474 | struct attribute *attrs[2]; | |
475 | struct attribute_group agroup = { | |
476 | .name = "features", | |
477 | .attrs = attrs, | |
478 | }; | |
479 | u64 features = get_features(fs_info, set); | |
480 | features &= ~supported_feature_masks[set]; | |
481 | ||
482 | if (!features) | |
483 | continue; | |
484 | ||
485 | attrs[1] = NULL; | |
486 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
487 | struct btrfs_feature_attr *fa; | |
488 | ||
489 | if (!(features & (1ULL << i))) | |
490 | continue; | |
491 | ||
492 | fa = &btrfs_feature_attrs[set][i]; | |
493 | attrs[0] = &fa->kobj_attr.attr; | |
494 | if (add) { | |
495 | int ret; | |
496 | ret = sysfs_merge_group(&fs_info->super_kobj, | |
497 | &agroup); | |
498 | if (ret) | |
499 | return ret; | |
500 | } else | |
501 | sysfs_unmerge_group(&fs_info->super_kobj, | |
502 | &agroup); | |
503 | } | |
504 | ||
505 | } | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) | |
5ac1d209 JM |
510 | { |
511 | kobject_del(&fs_info->super_kobj); | |
512 | kobject_put(&fs_info->super_kobj); | |
513 | wait_for_completion(&fs_info->kobj_unregister); | |
514 | } | |
515 | ||
e453d989 JM |
516 | void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) |
517 | { | |
518 | if (fs_info->space_info_kobj) { | |
519 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
520 | kobject_del(fs_info->space_info_kobj); | |
521 | kobject_put(fs_info->space_info_kobj); | |
522 | } | |
523 | kobject_del(fs_info->device_dir_kobj); | |
524 | kobject_put(fs_info->device_dir_kobj); | |
525 | addrm_unknown_feature_attrs(fs_info, false); | |
526 | sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); | |
527 | __btrfs_sysfs_remove_one(fs_info); | |
528 | } | |
529 | ||
79da4fa4 JM |
530 | const char * const btrfs_feature_set_names[3] = { |
531 | [FEAT_COMPAT] = "compat", | |
532 | [FEAT_COMPAT_RO] = "compat_ro", | |
533 | [FEAT_INCOMPAT] = "incompat", | |
534 | }; | |
535 | ||
3b02a68a JM |
536 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
537 | { | |
538 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
539 | int len = 0; | |
540 | int i; | |
541 | char *str; | |
542 | ||
543 | str = kmalloc(bufsize, GFP_KERNEL); | |
544 | if (!str) | |
545 | return str; | |
546 | ||
547 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
548 | const char *name; | |
549 | ||
550 | if (!(flags & (1ULL << i))) | |
551 | continue; | |
552 | ||
553 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
554 | len += snprintf(str + len, bufsize - len, "%s%s", | |
555 | len ? "," : "", name); | |
556 | } | |
557 | ||
558 | return str; | |
559 | } | |
560 | ||
79da4fa4 JM |
561 | static void init_feature_attrs(void) |
562 | { | |
563 | struct btrfs_feature_attr *fa; | |
564 | int set, i; | |
565 | ||
566 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
567 | ARRAY_SIZE(btrfs_feature_attrs)); | |
568 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
569 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
570 | ||
3b02a68a JM |
571 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
572 | memset(btrfs_unknown_feature_names, 0, | |
573 | sizeof(btrfs_unknown_feature_names)); | |
574 | ||
79da4fa4 JM |
575 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
576 | struct btrfs_feature_attr *sfa; | |
577 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 578 | int bit; |
79da4fa4 | 579 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
580 | bit = ilog2(sfa->feature_bit); |
581 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
582 | |
583 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
584 | } | |
585 | ||
586 | for (set = 0; set < FEAT_MAX; set++) { | |
587 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
588 | char *name = btrfs_unknown_feature_names[set][i]; | |
589 | fa = &btrfs_feature_attrs[set][i]; | |
590 | ||
591 | if (fa->kobj_attr.attr.name) | |
592 | continue; | |
593 | ||
594 | snprintf(name, 13, "%s:%u", | |
595 | btrfs_feature_set_names[set], i); | |
596 | ||
597 | fa->kobj_attr.attr.name = name; | |
598 | fa->kobj_attr.attr.mode = S_IRUGO; | |
599 | fa->feature_set = set; | |
600 | fa->feature_bit = 1ULL << i; | |
601 | } | |
602 | } | |
603 | } | |
604 | ||
99994cde AJ |
605 | int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info, |
606 | struct btrfs_device *one_device) | |
607 | { | |
608 | struct hd_struct *disk; | |
609 | struct kobject *disk_kobj; | |
610 | ||
611 | if (!fs_info->device_dir_kobj) | |
612 | return -EINVAL; | |
613 | ||
87fa3bb0 | 614 | if (one_device && one_device->bdev) { |
99994cde AJ |
615 | disk = one_device->bdev->bd_part; |
616 | disk_kobj = &part_to_dev(disk)->kobj; | |
617 | ||
618 | sysfs_remove_link(fs_info->device_dir_kobj, | |
619 | disk_kobj->name); | |
620 | } | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
0d39376a AJ |
625 | int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info, |
626 | struct btrfs_device *one_device) | |
29e5be24 JM |
627 | { |
628 | int error = 0; | |
629 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
630 | struct btrfs_device *dev; | |
631 | ||
0d39376a AJ |
632 | if (!fs_info->device_dir_kobj) |
633 | fs_info->device_dir_kobj = kobject_create_and_add("devices", | |
29e5be24 | 634 | &fs_info->super_kobj); |
0d39376a | 635 | |
29e5be24 JM |
636 | if (!fs_info->device_dir_kobj) |
637 | return -ENOMEM; | |
638 | ||
639 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { | |
f085381e AJ |
640 | struct hd_struct *disk; |
641 | struct kobject *disk_kobj; | |
642 | ||
643 | if (!dev->bdev) | |
644 | continue; | |
645 | ||
0d39376a AJ |
646 | if (one_device && one_device != dev) |
647 | continue; | |
648 | ||
f085381e AJ |
649 | disk = dev->bdev->bd_part; |
650 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 JM |
651 | |
652 | error = sysfs_create_link(fs_info->device_dir_kobj, | |
653 | disk_kobj, disk_kobj->name); | |
654 | if (error) | |
655 | break; | |
656 | } | |
657 | ||
658 | return error; | |
659 | } | |
660 | ||
510d7360 JM |
661 | /* /sys/fs/btrfs/ entry */ |
662 | static struct kset *btrfs_kset; | |
663 | ||
1bae3098 DS |
664 | /* /sys/kernel/debug/btrfs */ |
665 | static struct dentry *btrfs_debugfs_root_dentry; | |
666 | ||
667 | /* Debugging tunables and exported data */ | |
668 | u64 btrfs_debugfs_test; | |
669 | ||
5ac1d209 JM |
670 | int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) |
671 | { | |
672 | int error; | |
673 | ||
674 | init_completion(&fs_info->kobj_unregister); | |
510d7360 | 675 | fs_info->super_kobj.kset = btrfs_kset; |
5ac1d209 JM |
676 | error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, |
677 | "%pU", fs_info->fsid); | |
e453d989 JM |
678 | if (error) |
679 | return error; | |
510d7360 JM |
680 | |
681 | error = sysfs_create_group(&fs_info->super_kobj, | |
682 | &btrfs_feature_attr_group); | |
e453d989 JM |
683 | if (error) { |
684 | __btrfs_sysfs_remove_one(fs_info); | |
685 | return error; | |
686 | } | |
79da4fa4 | 687 | |
e453d989 | 688 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
689 | if (error) |
690 | goto failure; | |
691 | ||
0d39376a | 692 | error = btrfs_kobj_add_device(fs_info, NULL); |
29e5be24 JM |
693 | if (error) |
694 | goto failure; | |
695 | ||
6ab0a202 JM |
696 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
697 | &fs_info->super_kobj); | |
698 | if (!fs_info->space_info_kobj) { | |
699 | error = -ENOMEM; | |
700 | goto failure; | |
701 | } | |
702 | ||
703 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
704 | if (error) | |
705 | goto failure; | |
706 | ||
79da4fa4 JM |
707 | return 0; |
708 | failure: | |
709 | btrfs_sysfs_remove_one(fs_info); | |
5ac1d209 JM |
710 | return error; |
711 | } | |
712 | ||
1bae3098 DS |
713 | static int btrfs_init_debugfs(void) |
714 | { | |
715 | #ifdef CONFIG_DEBUG_FS | |
716 | btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); | |
717 | if (!btrfs_debugfs_root_dentry) | |
718 | return -ENOMEM; | |
719 | ||
720 | debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, | |
721 | &btrfs_debugfs_test); | |
722 | #endif | |
723 | return 0; | |
724 | } | |
725 | ||
b214107e | 726 | int btrfs_init_sysfs(void) |
58176a96 | 727 | { |
079b72bc | 728 | int ret; |
1bae3098 | 729 | |
e3fe4e71 GK |
730 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
731 | if (!btrfs_kset) | |
732 | return -ENOMEM; | |
079b72bc | 733 | |
1bae3098 DS |
734 | ret = btrfs_init_debugfs(); |
735 | if (ret) | |
001a648d | 736 | goto out1; |
79da4fa4 | 737 | |
1bae3098 | 738 | init_feature_attrs(); |
079b72bc | 739 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
740 | if (ret) |
741 | goto out2; | |
742 | ||
743 | return 0; | |
744 | out2: | |
745 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); | |
746 | out1: | |
747 | kset_unregister(btrfs_kset); | |
079b72bc | 748 | |
1bae3098 | 749 | return ret; |
58176a96 JB |
750 | } |
751 | ||
b214107e | 752 | void btrfs_exit_sysfs(void) |
58176a96 | 753 | { |
079b72bc | 754 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 755 | kset_unregister(btrfs_kset); |
1bae3098 | 756 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a96 | 757 | } |
55d47414 | 758 |