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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> |
58176a96 | 27 | |
bae45de0 CM |
28 | #include "ctree.h" |
29 | #include "disk-io.h" | |
30 | #include "transaction.h" | |
079b72bc | 31 | #include "sysfs.h" |
29e5be24 | 32 | #include "volumes.h" |
079b72bc | 33 | |
510d7360 | 34 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
5ac1d209 | 35 | |
510d7360 JM |
36 | static u64 get_features(struct btrfs_fs_info *fs_info, |
37 | enum btrfs_feature_set set) | |
5ac1d209 | 38 | { |
510d7360 JM |
39 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
40 | if (set == FEAT_COMPAT) | |
41 | return btrfs_super_compat_flags(disk_super); | |
42 | else if (set == FEAT_COMPAT_RO) | |
43 | return btrfs_super_compat_ro_flags(disk_super); | |
44 | else | |
45 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
46 | } |
47 | ||
ba631941 JM |
48 | static void set_features(struct btrfs_fs_info *fs_info, |
49 | enum btrfs_feature_set set, u64 features) | |
50 | { | |
51 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
52 | if (set == FEAT_COMPAT) | |
53 | btrfs_set_super_compat_flags(disk_super, features); | |
54 | else if (set == FEAT_COMPAT_RO) | |
55 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
56 | else | |
57 | btrfs_set_super_incompat_flags(disk_super, features); | |
58 | } | |
59 | ||
60 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
61 | { | |
62 | int val = 0; | |
63 | u64 set, clear; | |
64 | switch (fa->feature_set) { | |
65 | case FEAT_COMPAT: | |
66 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
67 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
68 | break; | |
69 | case FEAT_COMPAT_RO: | |
70 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
71 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
72 | break; | |
73 | case FEAT_INCOMPAT: | |
74 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
75 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
76 | break; | |
77 | default: | |
cc37bb04 DS |
78 | printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", |
79 | fa->feature_set); | |
80 | return 0; | |
ba631941 JM |
81 | } |
82 | ||
83 | if (set & fa->feature_bit) | |
84 | val |= 1; | |
85 | if (clear & fa->feature_bit) | |
86 | val |= 2; | |
87 | ||
88 | return val; | |
89 | } | |
90 | ||
510d7360 JM |
91 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
92 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 93 | { |
510d7360 | 94 | int val = 0; |
5ac1d209 | 95 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 96 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 97 | if (fs_info) { |
510d7360 JM |
98 | u64 features = get_features(fs_info, fa->feature_set); |
99 | if (features & fa->feature_bit) | |
100 | val = 1; | |
ba631941 JM |
101 | } else |
102 | val = can_modify_feature(fa); | |
510d7360 JM |
103 | |
104 | return snprintf(buf, PAGE_SIZE, "%d\n", val); | |
5ac1d209 JM |
105 | } |
106 | ||
ba631941 JM |
107 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
108 | struct kobj_attribute *a, | |
109 | const char *buf, size_t count) | |
110 | { | |
111 | struct btrfs_fs_info *fs_info; | |
112 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
113 | struct btrfs_trans_handle *trans; | |
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 | ||
43d87fa2 | 155 | trans = btrfs_start_transaction(fs_info->fs_root, 0); |
ba631941 JM |
156 | if (IS_ERR(trans)) |
157 | return PTR_ERR(trans); | |
158 | ||
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 | ||
168 | ret = btrfs_commit_transaction(trans, fs_info->fs_root); | |
169 | if (ret) | |
170 | return ret; | |
171 | ||
172 | return count; | |
173 | } | |
174 | ||
510d7360 JM |
175 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
176 | struct attribute *attr, int unused) | |
079b72bc | 177 | { |
510d7360 JM |
178 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
179 | umode_t mode = attr->mode; | |
180 | ||
181 | if (fs_info) { | |
182 | struct btrfs_feature_attr *fa; | |
183 | u64 features; | |
184 | ||
185 | fa = attr_to_btrfs_feature_attr(attr); | |
186 | features = get_features(fs_info, fa->feature_set); | |
187 | ||
ba631941 JM |
188 | if (can_modify_feature(fa)) |
189 | mode |= S_IWUSR; | |
190 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
191 | mode = 0; |
192 | } | |
193 | ||
194 | return mode; | |
079b72bc JM |
195 | } |
196 | ||
197 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); | |
198 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); | |
199 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
200 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
079b72bc JM |
201 | BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); |
202 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); | |
203 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
204 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 205 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
079b72bc JM |
206 | |
207 | static struct attribute *btrfs_supported_feature_attrs[] = { | |
208 | BTRFS_FEAT_ATTR_PTR(mixed_backref), | |
209 | BTRFS_FEAT_ATTR_PTR(default_subvol), | |
210 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
211 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
079b72bc JM |
212 | BTRFS_FEAT_ATTR_PTR(big_metadata), |
213 | BTRFS_FEAT_ATTR_PTR(extended_iref), | |
214 | BTRFS_FEAT_ATTR_PTR(raid56), | |
215 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 216 | BTRFS_FEAT_ATTR_PTR(no_holes), |
079b72bc JM |
217 | NULL |
218 | }; | |
219 | ||
220 | static const struct attribute_group btrfs_feature_attr_group = { | |
221 | .name = "features", | |
510d7360 | 222 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
223 | .attrs = btrfs_supported_feature_attrs, |
224 | }; | |
58176a96 | 225 | |
6ab0a202 JM |
226 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
227 | { | |
228 | u64 val; | |
229 | if (lock) | |
230 | spin_lock(lock); | |
231 | val = *value_ptr; | |
232 | if (lock) | |
233 | spin_unlock(lock); | |
234 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
235 | } | |
236 | ||
237 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
238 | struct kobj_attribute *ka, char *buf) | |
239 | { | |
240 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
241 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
242 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
243 | } | |
244 | BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show); | |
245 | ||
246 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
247 | struct kobj_attribute *a, char *buf) | |
248 | { | |
249 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
250 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
251 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
252 | } | |
253 | BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); | |
254 | ||
255 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
256 | ||
257 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
258 | struct kobj_attribute *attr, char *buf); | |
259 | BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); | |
260 | BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); | |
261 | ||
262 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
263 | struct kobj_attribute *attr, char *buf) | |
264 | ||
265 | { | |
266 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
267 | struct btrfs_block_group_cache *block_group; | |
268 | int index = kobj - sinfo->block_group_kobjs; | |
269 | u64 val = 0; | |
270 | ||
271 | down_read(&sinfo->groups_sem); | |
272 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
273 | if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) | |
274 | val += block_group->key.offset; | |
275 | else | |
276 | val += btrfs_block_group_used(&block_group->item); | |
277 | } | |
278 | up_read(&sinfo->groups_sem); | |
279 | return snprintf(buf, PAGE_SIZE, "%llu\n", val); | |
280 | } | |
281 | ||
282 | static struct attribute *raid_attributes[] = { | |
283 | BTRFS_RAID_ATTR_PTR(total_bytes), | |
284 | BTRFS_RAID_ATTR_PTR(used_bytes), | |
285 | NULL | |
286 | }; | |
287 | ||
288 | static void release_raid_kobj(struct kobject *kobj) | |
289 | { | |
290 | kobject_put(kobj->parent); | |
291 | } | |
292 | ||
293 | struct kobj_type btrfs_raid_ktype = { | |
294 | .sysfs_ops = &kobj_sysfs_ops, | |
295 | .release = release_raid_kobj, | |
296 | .default_attrs = raid_attributes, | |
297 | }; | |
298 | ||
299 | #define SPACE_INFO_ATTR(field) \ | |
300 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
301 | struct kobj_attribute *a, \ | |
302 | char *buf) \ | |
303 | { \ | |
304 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
305 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
306 | } \ | |
307 | BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field) | |
308 | ||
309 | static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, | |
310 | struct kobj_attribute *a, | |
311 | char *buf) | |
312 | { | |
313 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
314 | s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); | |
315 | return snprintf(buf, PAGE_SIZE, "%lld\n", val); | |
316 | } | |
317 | ||
318 | SPACE_INFO_ATTR(flags); | |
319 | SPACE_INFO_ATTR(total_bytes); | |
320 | SPACE_INFO_ATTR(bytes_used); | |
321 | SPACE_INFO_ATTR(bytes_pinned); | |
322 | SPACE_INFO_ATTR(bytes_reserved); | |
323 | SPACE_INFO_ATTR(bytes_may_use); | |
324 | SPACE_INFO_ATTR(disk_used); | |
325 | SPACE_INFO_ATTR(disk_total); | |
326 | BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned); | |
327 | ||
328 | static struct attribute *space_info_attrs[] = { | |
329 | BTRFS_ATTR_PTR(flags), | |
330 | BTRFS_ATTR_PTR(total_bytes), | |
331 | BTRFS_ATTR_PTR(bytes_used), | |
332 | BTRFS_ATTR_PTR(bytes_pinned), | |
333 | BTRFS_ATTR_PTR(bytes_reserved), | |
334 | BTRFS_ATTR_PTR(bytes_may_use), | |
335 | BTRFS_ATTR_PTR(disk_used), | |
336 | BTRFS_ATTR_PTR(disk_total), | |
337 | BTRFS_ATTR_PTR(total_bytes_pinned), | |
338 | NULL, | |
339 | }; | |
340 | ||
341 | static void space_info_release(struct kobject *kobj) | |
342 | { | |
343 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
344 | percpu_counter_destroy(&sinfo->total_bytes_pinned); | |
345 | kfree(sinfo); | |
346 | } | |
347 | ||
348 | struct kobj_type space_info_ktype = { | |
349 | .sysfs_ops = &kobj_sysfs_ops, | |
350 | .release = space_info_release, | |
351 | .default_attrs = space_info_attrs, | |
352 | }; | |
353 | ||
354 | static const struct attribute *allocation_attrs[] = { | |
355 | BTRFS_ATTR_PTR(global_rsv_reserved), | |
356 | BTRFS_ATTR_PTR(global_rsv_size), | |
357 | NULL, | |
358 | }; | |
359 | ||
f8ba9c11 JM |
360 | static ssize_t btrfs_label_show(struct kobject *kobj, |
361 | struct kobj_attribute *a, char *buf) | |
362 | { | |
363 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
364 | return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label); | |
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); | |
372 | struct btrfs_trans_handle *trans; | |
373 | struct btrfs_root *root = fs_info->fs_root; | |
374 | int ret; | |
375 | ||
376 | if (len >= BTRFS_LABEL_SIZE) { | |
efe120a0 | 377 | pr_err("BTRFS: unable to set label with more than %d bytes\n", |
f8ba9c11 JM |
378 | BTRFS_LABEL_SIZE - 1); |
379 | return -EINVAL; | |
380 | } | |
381 | ||
382 | trans = btrfs_start_transaction(root, 0); | |
383 | if (IS_ERR(trans)) | |
384 | return PTR_ERR(trans); | |
385 | ||
386 | spin_lock(&root->fs_info->super_lock); | |
387 | strcpy(fs_info->super_copy->label, buf); | |
388 | spin_unlock(&root->fs_info->super_lock); | |
389 | ret = btrfs_commit_transaction(trans, root); | |
390 | ||
391 | if (!ret) | |
392 | return len; | |
393 | ||
394 | return ret; | |
395 | } | |
396 | BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store); | |
397 | ||
398 | static struct attribute *btrfs_attrs[] = { | |
399 | BTRFS_ATTR_PTR(label), | |
400 | NULL, | |
401 | }; | |
402 | ||
510d7360 JM |
403 | static void btrfs_release_super_kobj(struct kobject *kobj) |
404 | { | |
405 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
406 | complete(&fs_info->kobj_unregister); | |
407 | } | |
408 | ||
409 | static struct kobj_type btrfs_ktype = { | |
410 | .sysfs_ops = &kobj_sysfs_ops, | |
411 | .release = btrfs_release_super_kobj, | |
f8ba9c11 | 412 | .default_attrs = btrfs_attrs, |
510d7360 JM |
413 | }; |
414 | ||
415 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) | |
416 | { | |
417 | if (kobj->ktype != &btrfs_ktype) | |
418 | return NULL; | |
419 | return container_of(kobj, struct btrfs_fs_info, super_kobj); | |
420 | } | |
58176a96 | 421 | |
e453d989 JM |
422 | #define NUM_FEATURE_BITS 64 |
423 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
424 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
425 | ||
426 | static u64 supported_feature_masks[3] = { | |
427 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, | |
428 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
429 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
430 | }; | |
431 | ||
432 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
433 | { | |
434 | int set; | |
435 | ||
436 | for (set = 0; set < FEAT_MAX; set++) { | |
437 | int i; | |
438 | struct attribute *attrs[2]; | |
439 | struct attribute_group agroup = { | |
440 | .name = "features", | |
441 | .attrs = attrs, | |
442 | }; | |
443 | u64 features = get_features(fs_info, set); | |
444 | features &= ~supported_feature_masks[set]; | |
445 | ||
446 | if (!features) | |
447 | continue; | |
448 | ||
449 | attrs[1] = NULL; | |
450 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
451 | struct btrfs_feature_attr *fa; | |
452 | ||
453 | if (!(features & (1ULL << i))) | |
454 | continue; | |
455 | ||
456 | fa = &btrfs_feature_attrs[set][i]; | |
457 | attrs[0] = &fa->kobj_attr.attr; | |
458 | if (add) { | |
459 | int ret; | |
460 | ret = sysfs_merge_group(&fs_info->super_kobj, | |
461 | &agroup); | |
462 | if (ret) | |
463 | return ret; | |
464 | } else | |
465 | sysfs_unmerge_group(&fs_info->super_kobj, | |
466 | &agroup); | |
467 | } | |
468 | ||
469 | } | |
470 | return 0; | |
471 | } | |
472 | ||
473 | static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) | |
5ac1d209 JM |
474 | { |
475 | kobject_del(&fs_info->super_kobj); | |
476 | kobject_put(&fs_info->super_kobj); | |
477 | wait_for_completion(&fs_info->kobj_unregister); | |
478 | } | |
479 | ||
e453d989 JM |
480 | void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) |
481 | { | |
482 | if (fs_info->space_info_kobj) { | |
483 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
484 | kobject_del(fs_info->space_info_kobj); | |
485 | kobject_put(fs_info->space_info_kobj); | |
486 | } | |
487 | kobject_del(fs_info->device_dir_kobj); | |
488 | kobject_put(fs_info->device_dir_kobj); | |
489 | addrm_unknown_feature_attrs(fs_info, false); | |
490 | sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); | |
491 | __btrfs_sysfs_remove_one(fs_info); | |
492 | } | |
493 | ||
79da4fa4 JM |
494 | const char * const btrfs_feature_set_names[3] = { |
495 | [FEAT_COMPAT] = "compat", | |
496 | [FEAT_COMPAT_RO] = "compat_ro", | |
497 | [FEAT_INCOMPAT] = "incompat", | |
498 | }; | |
499 | ||
3b02a68a JM |
500 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
501 | { | |
502 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
503 | int len = 0; | |
504 | int i; | |
505 | char *str; | |
506 | ||
507 | str = kmalloc(bufsize, GFP_KERNEL); | |
508 | if (!str) | |
509 | return str; | |
510 | ||
511 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
512 | const char *name; | |
513 | ||
514 | if (!(flags & (1ULL << i))) | |
515 | continue; | |
516 | ||
517 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
518 | len += snprintf(str + len, bufsize - len, "%s%s", | |
519 | len ? "," : "", name); | |
520 | } | |
521 | ||
522 | return str; | |
523 | } | |
524 | ||
79da4fa4 JM |
525 | static void init_feature_attrs(void) |
526 | { | |
527 | struct btrfs_feature_attr *fa; | |
528 | int set, i; | |
529 | ||
530 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
531 | ARRAY_SIZE(btrfs_feature_attrs)); | |
532 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
533 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
534 | ||
3b02a68a JM |
535 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
536 | memset(btrfs_unknown_feature_names, 0, | |
537 | sizeof(btrfs_unknown_feature_names)); | |
538 | ||
79da4fa4 JM |
539 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
540 | struct btrfs_feature_attr *sfa; | |
541 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 542 | int bit; |
79da4fa4 | 543 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
544 | bit = ilog2(sfa->feature_bit); |
545 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
546 | |
547 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
548 | } | |
549 | ||
550 | for (set = 0; set < FEAT_MAX; set++) { | |
551 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
552 | char *name = btrfs_unknown_feature_names[set][i]; | |
553 | fa = &btrfs_feature_attrs[set][i]; | |
554 | ||
555 | if (fa->kobj_attr.attr.name) | |
556 | continue; | |
557 | ||
558 | snprintf(name, 13, "%s:%u", | |
559 | btrfs_feature_set_names[set], i); | |
560 | ||
561 | fa->kobj_attr.attr.name = name; | |
562 | fa->kobj_attr.attr.mode = S_IRUGO; | |
563 | fa->feature_set = set; | |
564 | fa->feature_bit = 1ULL << i; | |
565 | } | |
566 | } | |
567 | } | |
568 | ||
29e5be24 JM |
569 | static int add_device_membership(struct btrfs_fs_info *fs_info) |
570 | { | |
571 | int error = 0; | |
572 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
573 | struct btrfs_device *dev; | |
574 | ||
575 | fs_info->device_dir_kobj = kobject_create_and_add("devices", | |
576 | &fs_info->super_kobj); | |
577 | if (!fs_info->device_dir_kobj) | |
578 | return -ENOMEM; | |
579 | ||
580 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { | |
f085381e AJ |
581 | struct hd_struct *disk; |
582 | struct kobject *disk_kobj; | |
583 | ||
584 | if (!dev->bdev) | |
585 | continue; | |
586 | ||
587 | disk = dev->bdev->bd_part; | |
588 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 JM |
589 | |
590 | error = sysfs_create_link(fs_info->device_dir_kobj, | |
591 | disk_kobj, disk_kobj->name); | |
592 | if (error) | |
593 | break; | |
594 | } | |
595 | ||
596 | return error; | |
597 | } | |
598 | ||
510d7360 JM |
599 | /* /sys/fs/btrfs/ entry */ |
600 | static struct kset *btrfs_kset; | |
601 | ||
5ac1d209 JM |
602 | int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) |
603 | { | |
604 | int error; | |
605 | ||
606 | init_completion(&fs_info->kobj_unregister); | |
510d7360 | 607 | fs_info->super_kobj.kset = btrfs_kset; |
5ac1d209 JM |
608 | error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, |
609 | "%pU", fs_info->fsid); | |
e453d989 JM |
610 | if (error) |
611 | return error; | |
510d7360 JM |
612 | |
613 | error = sysfs_create_group(&fs_info->super_kobj, | |
614 | &btrfs_feature_attr_group); | |
e453d989 JM |
615 | if (error) { |
616 | __btrfs_sysfs_remove_one(fs_info); | |
617 | return error; | |
618 | } | |
79da4fa4 | 619 | |
e453d989 | 620 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
621 | if (error) |
622 | goto failure; | |
623 | ||
29e5be24 JM |
624 | error = add_device_membership(fs_info); |
625 | if (error) | |
626 | goto failure; | |
627 | ||
6ab0a202 JM |
628 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
629 | &fs_info->super_kobj); | |
630 | if (!fs_info->space_info_kobj) { | |
631 | error = -ENOMEM; | |
632 | goto failure; | |
633 | } | |
634 | ||
635 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
636 | if (error) | |
637 | goto failure; | |
638 | ||
79da4fa4 JM |
639 | return 0; |
640 | failure: | |
641 | btrfs_sysfs_remove_one(fs_info); | |
5ac1d209 JM |
642 | return error; |
643 | } | |
644 | ||
b214107e | 645 | int btrfs_init_sysfs(void) |
58176a96 | 646 | { |
079b72bc | 647 | int ret; |
e3fe4e71 GK |
648 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
649 | if (!btrfs_kset) | |
650 | return -ENOMEM; | |
079b72bc | 651 | |
79da4fa4 JM |
652 | init_feature_attrs(); |
653 | ||
079b72bc JM |
654 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
655 | if (ret) { | |
656 | kset_unregister(btrfs_kset); | |
657 | return ret; | |
658 | } | |
659 | ||
e3fe4e71 | 660 | return 0; |
58176a96 JB |
661 | } |
662 | ||
b214107e | 663 | void btrfs_exit_sysfs(void) |
58176a96 | 664 | { |
079b72bc | 665 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 666 | kset_unregister(btrfs_kset); |
58176a96 | 667 | } |
55d47414 | 668 |