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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); | |
114 | struct btrfs_trans_handle *trans; | |
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 | ||
123 | ret = kstrtoul(skip_spaces(buf), 0, &val); | |
124 | if (ret) | |
125 | return ret; | |
126 | ||
127 | if (fa->feature_set == FEAT_COMPAT) { | |
128 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
129 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
130 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
131 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
132 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
133 | } else { | |
134 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
135 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
136 | } | |
137 | ||
138 | features = get_features(fs_info, fa->feature_set); | |
139 | ||
140 | /* Nothing to do */ | |
141 | if ((val && (features & fa->feature_bit)) || | |
142 | (!val && !(features & fa->feature_bit))) | |
143 | return count; | |
144 | ||
145 | if ((val && !(set & fa->feature_bit)) || | |
146 | (!val && !(clear & fa->feature_bit))) { | |
147 | btrfs_info(fs_info, | |
148 | "%sabling feature %s on mounted fs is not supported.", | |
149 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
150 | return -EPERM; | |
151 | } | |
152 | ||
153 | btrfs_info(fs_info, "%s %s feature flag", | |
154 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
155 | ||
43d87fa2 | 156 | trans = btrfs_start_transaction(fs_info->fs_root, 0); |
ba631941 JM |
157 | if (IS_ERR(trans)) |
158 | return PTR_ERR(trans); | |
159 | ||
160 | spin_lock(&fs_info->super_lock); | |
161 | features = get_features(fs_info, fa->feature_set); | |
162 | if (val) | |
163 | features |= fa->feature_bit; | |
164 | else | |
165 | features &= ~fa->feature_bit; | |
166 | set_features(fs_info, fa->feature_set, features); | |
167 | spin_unlock(&fs_info->super_lock); | |
168 | ||
169 | ret = btrfs_commit_transaction(trans, fs_info->fs_root); | |
170 | if (ret) | |
171 | return ret; | |
172 | ||
173 | return count; | |
174 | } | |
175 | ||
510d7360 JM |
176 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
177 | struct attribute *attr, int unused) | |
079b72bc | 178 | { |
510d7360 JM |
179 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
180 | umode_t mode = attr->mode; | |
181 | ||
182 | if (fs_info) { | |
183 | struct btrfs_feature_attr *fa; | |
184 | u64 features; | |
185 | ||
186 | fa = attr_to_btrfs_feature_attr(attr); | |
187 | features = get_features(fs_info, fa->feature_set); | |
188 | ||
ba631941 JM |
189 | if (can_modify_feature(fa)) |
190 | mode |= S_IWUSR; | |
191 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
192 | mode = 0; |
193 | } | |
194 | ||
195 | return mode; | |
079b72bc JM |
196 | } |
197 | ||
198 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
199 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
200 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
201 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
079b72bc JM |
202 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
203 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
204 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
205 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 206 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
079b72bc JM |
207 | |
208 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
209 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
210 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
211 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
212 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
079b72bc JM |
213 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
214 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
215 | BTRFS_FEAT_ATTR_PTR(raid56), | |
216 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 217 | BTRFS_FEAT_ATTR_PTR(no_holes), |
079b72bc JM |
218 | NULL |
219 | }; | |
220 | ||
221 | static const struct attribute_group btrfs_feature_attr_group = { | |
222 | .name = "features", | |
510d7360 | 223 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
224 | .attrs = btrfs_supported_feature_attrs, |
225 | }; | |
58176a96 | 226 | |
6ab0a202 JM |
227 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
228 | { | |
229 | u64 val; | |
230 | if (lock) | |
231 | spin_lock(lock); | |
232 | val = *value_ptr; | |
233 | if (lock) | |
234 | spin_unlock(lock); | |
235 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
236 | } | |
237 | ||
238 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
239 | struct kobj_attribute *ka, char *buf) | |
240 | { | |
241 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
242 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
243 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
244 | } | |
245 | BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show); | |
246 | ||
247 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
248 | struct kobj_attribute *a, char *buf) | |
249 | { | |
250 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
251 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
252 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
253 | } | |
254 | BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); | |
255 | ||
256 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
257 | ||
258 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
259 | struct kobj_attribute *attr, char *buf); | |
260 | BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); | |
261 | BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); | |
262 | ||
263 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
264 | struct kobj_attribute *attr, char *buf) | |
265 | ||
266 | { | |
267 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
268 | struct btrfs_block_group_cache *block_group; | |
269 | int index = kobj - sinfo->block_group_kobjs; | |
270 | u64 val = 0; | |
271 | ||
272 | down_read(&sinfo->groups_sem); | |
273 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
274 | if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) | |
275 | val += block_group->key.offset; | |
276 | else | |
277 | val += btrfs_block_group_used(&block_group->item); | |
278 | } | |
279 | up_read(&sinfo->groups_sem); | |
280 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
281 | } | |
282 | ||
283 | static struct attribute *raid_attributes[] = { | |
284 | BTRFS_RAID_ATTR_PTR(total_bytes), | |
285 | BTRFS_RAID_ATTR_PTR(used_bytes), | |
286 | NULL | |
287 | }; | |
288 | ||
289 | static void release_raid_kobj(struct kobject *kobj) | |
290 | { | |
291 | kobject_put(kobj->parent); | |
292 | } | |
293 | ||
294 | struct kobj_type btrfs_raid_ktype = { | |
295 | .sysfs_ops = &kobj_sysfs_ops, | |
296 | .release = release_raid_kobj, | |
297 | .default_attrs = raid_attributes, | |
298 | }; | |
299 | ||
300 | #define SPACE_INFO_ATTR(field) \ | |
301 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
302 | struct kobj_attribute *a, \ | |
303 | char *buf) \ | |
304 | { \ | |
305 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
306 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
307 | } \ | |
308 | BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field) | |
309 | ||
310 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
311 | struct kobj_attribute *a, | |
312 | char *buf) | |
313 | { | |
314 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
315 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
316 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
317 | } | |
318 | ||
319 | SPACE_INFO_ATTR(flags); | |
320 | SPACE_INFO_ATTR(total_bytes); | |
321 | SPACE_INFO_ATTR(bytes_used); | |
322 | SPACE_INFO_ATTR(bytes_pinned); | |
323 | SPACE_INFO_ATTR(bytes_reserved); | |
324 | SPACE_INFO_ATTR(bytes_may_use); | |
325 | SPACE_INFO_ATTR(disk_used); | |
326 | SPACE_INFO_ATTR(disk_total); | |
327 | BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned); | |
328 | ||
329 | static struct attribute *space_info_attrs[] = { | |
330 | BTRFS_ATTR_PTR(flags), | |
331 | BTRFS_ATTR_PTR(total_bytes), | |
332 | BTRFS_ATTR_PTR(bytes_used), | |
333 | BTRFS_ATTR_PTR(bytes_pinned), | |
334 | BTRFS_ATTR_PTR(bytes_reserved), | |
335 | BTRFS_ATTR_PTR(bytes_may_use), | |
336 | BTRFS_ATTR_PTR(disk_used), | |
337 | BTRFS_ATTR_PTR(disk_total), | |
338 | BTRFS_ATTR_PTR(total_bytes_pinned), | |
339 | NULL, | |
340 | }; | |
341 | ||
342 | static void space_info_release(struct kobject *kobj) | |
343 | { | |
344 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
345 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
346 | kfree(sinfo); | |
347 | } | |
348 | ||
349 | struct kobj_type space_info_ktype = { | |
350 | .sysfs_ops = &kobj_sysfs_ops, | |
351 | .release = space_info_release, | |
352 | .default_attrs = space_info_attrs, | |
353 | }; | |
354 | ||
355 | static const struct attribute *allocation_attrs[] = { | |
356 | BTRFS_ATTR_PTR(global_rsv_reserved), | |
357 | BTRFS_ATTR_PTR(global_rsv_size), | |
358 | NULL, | |
359 | }; | |
360 | ||
f8ba9c11 JM |
361 | static ssize_t btrfs_label_show(struct kobject *kobj, |
362 | struct kobj_attribute *a, char *buf) | |
363 | { | |
364 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
365 | return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label); | |
366 | } | |
367 | ||
368 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
369 | struct kobj_attribute *a, | |
370 | const char *buf, size_t len) | |
371 | { | |
372 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
373 | struct btrfs_trans_handle *trans; | |
374 | struct btrfs_root *root = fs_info->fs_root; | |
375 | int ret; | |
376 | ||
377 | if (len >= BTRFS_LABEL_SIZE) { | |
efe120a0 | 378 | pr_err("BTRFS: unable to set label with more than %d bytes\n", |
f8ba9c11 JM |
379 | BTRFS_LABEL_SIZE - 1); |
380 | return -EINVAL; | |
381 | } | |
382 | ||
383 | trans = btrfs_start_transaction(root, 0); | |
384 | if (IS_ERR(trans)) | |
385 | return PTR_ERR(trans); | |
386 | ||
387 | spin_lock(&root->fs_info->super_lock); | |
388 | strcpy(fs_info->super_copy->label, buf); | |
389 | spin_unlock(&root->fs_info->super_lock); | |
390 | ret = btrfs_commit_transaction(trans, root); | |
391 | ||
392 | if (!ret) | |
393 | return len; | |
394 | ||
395 | return ret; | |
396 | } | |
397 | BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store); | |
398 | ||
399 | static struct attribute *btrfs_attrs[] = { | |
400 | BTRFS_ATTR_PTR(label), | |
401 | NULL, | |
402 | }; | |
403 | ||
510d7360 JM |
404 | static void btrfs_release_super_kobj(struct kobject *kobj) |
405 | { | |
406 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
407 | complete(&fs_info->kobj_unregister); | |
408 | } | |
409 | ||
410 | static struct kobj_type btrfs_ktype = { | |
411 | .sysfs_ops = &kobj_sysfs_ops, | |
412 | .release = btrfs_release_super_kobj, | |
f8ba9c11 | 413 | .default_attrs = btrfs_attrs, |
510d7360 JM |
414 | }; |
415 | ||
416 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) | |
417 | { | |
418 | if (kobj->ktype != &btrfs_ktype) | |
419 | return NULL; | |
420 | return container_of(kobj, struct btrfs_fs_info, super_kobj); | |
421 | } | |
58176a96 | 422 | |
e453d989 JM |
423 | #define NUM_FEATURE_BITS 64 |
424 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
425 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
426 | ||
427 | static u64 supported_feature_masks[3] = { | |
428 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, | |
429 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
430 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
431 | }; | |
432 | ||
433 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
434 | { | |
435 | int set; | |
436 | ||
437 | for (set = 0; set < FEAT_MAX; set++) { | |
438 | int i; | |
439 | struct attribute *attrs[2]; | |
440 | struct attribute_group agroup = { | |
441 | .name = "features", | |
442 | .attrs = attrs, | |
443 | }; | |
444 | u64 features = get_features(fs_info, set); | |
445 | features &= ~supported_feature_masks[set]; | |
446 | ||
447 | if (!features) | |
448 | continue; | |
449 | ||
450 | attrs[1] = NULL; | |
451 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
452 | struct btrfs_feature_attr *fa; | |
453 | ||
454 | if (!(features & (1ULL << i))) | |
455 | continue; | |
456 | ||
457 | fa = &btrfs_feature_attrs[set][i]; | |
458 | attrs[0] = &fa->kobj_attr.attr; | |
459 | if (add) { | |
460 | int ret; | |
461 | ret = sysfs_merge_group(&fs_info->super_kobj, | |
462 | &agroup); | |
463 | if (ret) | |
464 | return ret; | |
465 | } else | |
466 | sysfs_unmerge_group(&fs_info->super_kobj, | |
467 | &agroup); | |
468 | } | |
469 | ||
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) | |
5ac1d209 JM |
475 | { |
476 | kobject_del(&fs_info->super_kobj); | |
477 | kobject_put(&fs_info->super_kobj); | |
478 | wait_for_completion(&fs_info->kobj_unregister); | |
479 | } | |
480 | ||
e453d989 JM |
481 | void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) |
482 | { | |
483 | if (fs_info->space_info_kobj) { | |
484 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
485 | kobject_del(fs_info->space_info_kobj); | |
486 | kobject_put(fs_info->space_info_kobj); | |
487 | } | |
488 | kobject_del(fs_info->device_dir_kobj); | |
489 | kobject_put(fs_info->device_dir_kobj); | |
490 | addrm_unknown_feature_attrs(fs_info, false); | |
491 | sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); | |
492 | __btrfs_sysfs_remove_one(fs_info); | |
493 | } | |
494 | ||
79da4fa4 JM |
495 | const char * const btrfs_feature_set_names[3] = { |
496 | [FEAT_COMPAT] = "compat", | |
497 | [FEAT_COMPAT_RO] = "compat_ro", | |
498 | [FEAT_INCOMPAT] = "incompat", | |
499 | }; | |
500 | ||
3b02a68a JM |
501 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
502 | { | |
503 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
504 | int len = 0; | |
505 | int i; | |
506 | char *str; | |
507 | ||
508 | str = kmalloc(bufsize, GFP_KERNEL); | |
509 | if (!str) | |
510 | return str; | |
511 | ||
512 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
513 | const char *name; | |
514 | ||
515 | if (!(flags & (1ULL << i))) | |
516 | continue; | |
517 | ||
518 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
519 | len += snprintf(str + len, bufsize - len, "%s%s", | |
520 | len ? "," : "", name); | |
521 | } | |
522 | ||
523 | return str; | |
524 | } | |
525 | ||
79da4fa4 JM |
526 | static void init_feature_attrs(void) |
527 | { | |
528 | struct btrfs_feature_attr *fa; | |
529 | int set, i; | |
530 | ||
531 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
532 | ARRAY_SIZE(btrfs_feature_attrs)); | |
533 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
534 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
535 | ||
3b02a68a JM |
536 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
537 | memset(btrfs_unknown_feature_names, 0, | |
538 | sizeof(btrfs_unknown_feature_names)); | |
539 | ||
79da4fa4 JM |
540 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
541 | struct btrfs_feature_attr *sfa; | |
542 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 543 | int bit; |
79da4fa4 | 544 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
545 | bit = ilog2(sfa->feature_bit); |
546 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
547 | |
548 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
549 | } | |
550 | ||
551 | for (set = 0; set < FEAT_MAX; set++) { | |
552 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
553 | char *name = btrfs_unknown_feature_names[set][i]; | |
554 | fa = &btrfs_feature_attrs[set][i]; | |
555 | ||
556 | if (fa->kobj_attr.attr.name) | |
557 | continue; | |
558 | ||
559 | snprintf(name, 13, "%s:%u", | |
560 | btrfs_feature_set_names[set], i); | |
561 | ||
562 | fa->kobj_attr.attr.name = name; | |
563 | fa->kobj_attr.attr.mode = S_IRUGO; | |
564 | fa->feature_set = set; | |
565 | fa->feature_bit = 1ULL << i; | |
566 | } | |
567 | } | |
568 | } | |
569 | ||
29e5be24 JM |
570 | static int add_device_membership(struct btrfs_fs_info *fs_info) |
571 | { | |
572 | int error = 0; | |
573 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
574 | struct btrfs_device *dev; | |
575 | ||
576 | fs_info->device_dir_kobj = kobject_create_and_add("devices", | |
577 | &fs_info->super_kobj); | |
578 | if (!fs_info->device_dir_kobj) | |
579 | return -ENOMEM; | |
580 | ||
581 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { | |
f085381e AJ |
582 | struct hd_struct *disk; |
583 | struct kobject *disk_kobj; | |
584 | ||
585 | if (!dev->bdev) | |
586 | continue; | |
587 | ||
588 | disk = dev->bdev->bd_part; | |
589 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 JM |
590 | |
591 | error = sysfs_create_link(fs_info->device_dir_kobj, | |
592 | disk_kobj, disk_kobj->name); | |
593 | if (error) | |
594 | break; | |
595 | } | |
596 | ||
597 | return error; | |
598 | } | |
599 | ||
510d7360 JM |
600 | /* /sys/fs/btrfs/ entry */ |
601 | static struct kset *btrfs_kset; | |
602 | ||
1bae3098 DS |
603 | /* /sys/kernel/debug/btrfs */ |
604 | static struct dentry *btrfs_debugfs_root_dentry; | |
605 | ||
606 | /* Debugging tunables and exported data */ | |
607 | u64 btrfs_debugfs_test; | |
608 | ||
5ac1d209 JM |
609 | int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) |
610 | { | |
611 | int error; | |
612 | ||
613 | init_completion(&fs_info->kobj_unregister); | |
510d7360 | 614 | fs_info->super_kobj.kset = btrfs_kset; |
5ac1d209 JM |
615 | error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, |
616 | "%pU", fs_info->fsid); | |
e453d989 JM |
617 | if (error) |
618 | return error; | |
510d7360 JM |
619 | |
620 | error = sysfs_create_group(&fs_info->super_kobj, | |
621 | &btrfs_feature_attr_group); | |
e453d989 JM |
622 | if (error) { |
623 | __btrfs_sysfs_remove_one(fs_info); | |
624 | return error; | |
625 | } | |
79da4fa4 | 626 | |
e453d989 | 627 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
628 | if (error) |
629 | goto failure; | |
630 | ||
29e5be24 JM |
631 | error = add_device_membership(fs_info); |
632 | if (error) | |
633 | goto failure; | |
634 | ||
6ab0a202 JM |
635 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
636 | &fs_info->super_kobj); | |
637 | if (!fs_info->space_info_kobj) { | |
638 | error = -ENOMEM; | |
639 | goto failure; | |
640 | } | |
641 | ||
642 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
643 | if (error) | |
644 | goto failure; | |
645 | ||
79da4fa4 JM |
646 | return 0; |
647 | failure: | |
648 | btrfs_sysfs_remove_one(fs_info); | |
5ac1d209 JM |
649 | return error; |
650 | } | |
651 | ||
1bae3098 DS |
652 | static int btrfs_init_debugfs(void) |
653 | { | |
654 | #ifdef CONFIG_DEBUG_FS | |
655 | btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); | |
656 | if (!btrfs_debugfs_root_dentry) | |
657 | return -ENOMEM; | |
658 | ||
659 | debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, | |
660 | &btrfs_debugfs_test); | |
661 | #endif | |
662 | return 0; | |
663 | } | |
664 | ||
b214107e | 665 | int btrfs_init_sysfs(void) |
58176a96 | 666 | { |
079b72bc | 667 | int ret; |
1bae3098 | 668 | |
e3fe4e71 GK |
669 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
670 | if (!btrfs_kset) | |
671 | return -ENOMEM; | |
079b72bc | 672 | |
1bae3098 DS |
673 | ret = btrfs_init_debugfs(); |
674 | if (ret) | |
675 | return ret; | |
79da4fa4 | 676 | |
1bae3098 | 677 | init_feature_attrs(); |
079b72bc | 678 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
079b72bc | 679 | |
1bae3098 | 680 | return ret; |
58176a96 JB |
681 | } |
682 | ||
b214107e | 683 | void btrfs_exit_sysfs(void) |
58176a96 | 684 | { |
079b72bc | 685 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 686 | kset_unregister(btrfs_kset); |
1bae3098 | 687 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a96 | 688 | } |
55d47414 | 689 |