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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 | ||
402a0f47 | 377 | if (len >= BTRFS_LABEL_SIZE) |
f8ba9c11 | 378 | return -EINVAL; |
f8ba9c11 JM |
379 | |
380 | trans = btrfs_start_transaction(root, 0); | |
381 | if (IS_ERR(trans)) | |
382 | return PTR_ERR(trans); | |
383 | ||
384 | spin_lock(&root->fs_info->super_lock); | |
385 | strcpy(fs_info->super_copy->label, buf); | |
386 | spin_unlock(&root->fs_info->super_lock); | |
387 | ret = btrfs_commit_transaction(trans, root); | |
388 | ||
389 | if (!ret) | |
390 | return len; | |
391 | ||
392 | return ret; | |
393 | } | |
394 | BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store); | |
395 | ||
df93589a DS |
396 | static ssize_t btrfs_no_store(struct kobject *kobj, |
397 | struct kobj_attribute *a, | |
398 | const char *buf, size_t len) | |
399 | { | |
400 | return -EPERM; | |
401 | } | |
402 | ||
403 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, | |
404 | struct kobj_attribute *a, char *buf) | |
405 | { | |
406 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
407 | ||
408 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize); | |
409 | } | |
410 | ||
411 | BTRFS_ATTR_RW(nodesize, 0444, btrfs_nodesize_show, btrfs_no_store); | |
412 | ||
413 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
414 | struct kobj_attribute *a, char *buf) | |
415 | { | |
416 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
417 | ||
418 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); | |
419 | } | |
420 | ||
421 | BTRFS_ATTR_RW(sectorsize, 0444, btrfs_sectorsize_show, btrfs_no_store); | |
422 | ||
423 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, | |
424 | struct kobj_attribute *a, char *buf) | |
425 | { | |
426 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
427 | ||
428 | return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize); | |
429 | } | |
430 | ||
431 | BTRFS_ATTR_RW(clone_alignment, 0444, btrfs_clone_alignment_show, btrfs_no_store); | |
432 | ||
f8ba9c11 JM |
433 | static struct attribute *btrfs_attrs[] = { |
434 | BTRFS_ATTR_PTR(label), | |
df93589a DS |
435 | BTRFS_ATTR_PTR(nodesize), |
436 | BTRFS_ATTR_PTR(sectorsize), | |
437 | BTRFS_ATTR_PTR(clone_alignment), | |
f8ba9c11 JM |
438 | NULL, |
439 | }; | |
440 | ||
510d7360 JM |
441 | static void btrfs_release_super_kobj(struct kobject *kobj) |
442 | { | |
443 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
444 | complete(&fs_info->kobj_unregister); | |
445 | } | |
446 | ||
447 | static struct kobj_type btrfs_ktype = { | |
448 | .sysfs_ops = &kobj_sysfs_ops, | |
449 | .release = btrfs_release_super_kobj, | |
f8ba9c11 | 450 | .default_attrs = btrfs_attrs, |
510d7360 JM |
451 | }; |
452 | ||
453 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) | |
454 | { | |
455 | if (kobj->ktype != &btrfs_ktype) | |
456 | return NULL; | |
457 | return container_of(kobj, struct btrfs_fs_info, super_kobj); | |
458 | } | |
58176a96 | 459 | |
e453d989 JM |
460 | #define NUM_FEATURE_BITS 64 |
461 | static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; | |
462 | static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; | |
463 | ||
464 | static u64 supported_feature_masks[3] = { | |
465 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, | |
466 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
467 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
468 | }; | |
469 | ||
470 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
471 | { | |
472 | int set; | |
473 | ||
474 | for (set = 0; set < FEAT_MAX; set++) { | |
475 | int i; | |
476 | struct attribute *attrs[2]; | |
477 | struct attribute_group agroup = { | |
478 | .name = "features", | |
479 | .attrs = attrs, | |
480 | }; | |
481 | u64 features = get_features(fs_info, set); | |
482 | features &= ~supported_feature_masks[set]; | |
483 | ||
484 | if (!features) | |
485 | continue; | |
486 | ||
487 | attrs[1] = NULL; | |
488 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
489 | struct btrfs_feature_attr *fa; | |
490 | ||
491 | if (!(features & (1ULL << i))) | |
492 | continue; | |
493 | ||
494 | fa = &btrfs_feature_attrs[set][i]; | |
495 | attrs[0] = &fa->kobj_attr.attr; | |
496 | if (add) { | |
497 | int ret; | |
498 | ret = sysfs_merge_group(&fs_info->super_kobj, | |
499 | &agroup); | |
500 | if (ret) | |
501 | return ret; | |
502 | } else | |
503 | sysfs_unmerge_group(&fs_info->super_kobj, | |
504 | &agroup); | |
505 | } | |
506 | ||
507 | } | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) | |
5ac1d209 JM |
512 | { |
513 | kobject_del(&fs_info->super_kobj); | |
514 | kobject_put(&fs_info->super_kobj); | |
515 | wait_for_completion(&fs_info->kobj_unregister); | |
516 | } | |
517 | ||
e453d989 JM |
518 | void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) |
519 | { | |
520 | if (fs_info->space_info_kobj) { | |
521 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
522 | kobject_del(fs_info->space_info_kobj); | |
523 | kobject_put(fs_info->space_info_kobj); | |
524 | } | |
525 | kobject_del(fs_info->device_dir_kobj); | |
526 | kobject_put(fs_info->device_dir_kobj); | |
527 | addrm_unknown_feature_attrs(fs_info, false); | |
528 | sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); | |
529 | __btrfs_sysfs_remove_one(fs_info); | |
530 | } | |
531 | ||
79da4fa4 JM |
532 | const char * const btrfs_feature_set_names[3] = { |
533 | [FEAT_COMPAT] = "compat", | |
534 | [FEAT_COMPAT_RO] = "compat_ro", | |
535 | [FEAT_INCOMPAT] = "incompat", | |
536 | }; | |
537 | ||
3b02a68a JM |
538 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
539 | { | |
540 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
541 | int len = 0; | |
542 | int i; | |
543 | char *str; | |
544 | ||
545 | str = kmalloc(bufsize, GFP_KERNEL); | |
546 | if (!str) | |
547 | return str; | |
548 | ||
549 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
550 | const char *name; | |
551 | ||
552 | if (!(flags & (1ULL << i))) | |
553 | continue; | |
554 | ||
555 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
556 | len += snprintf(str + len, bufsize - len, "%s%s", | |
557 | len ? "," : "", name); | |
558 | } | |
559 | ||
560 | return str; | |
561 | } | |
562 | ||
79da4fa4 JM |
563 | static void init_feature_attrs(void) |
564 | { | |
565 | struct btrfs_feature_attr *fa; | |
566 | int set, i; | |
567 | ||
568 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != | |
569 | ARRAY_SIZE(btrfs_feature_attrs)); | |
570 | BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != | |
571 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
572 | ||
3b02a68a JM |
573 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
574 | memset(btrfs_unknown_feature_names, 0, | |
575 | sizeof(btrfs_unknown_feature_names)); | |
576 | ||
79da4fa4 JM |
577 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
578 | struct btrfs_feature_attr *sfa; | |
579 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 580 | int bit; |
79da4fa4 | 581 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
582 | bit = ilog2(sfa->feature_bit); |
583 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
584 | |
585 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
586 | } | |
587 | ||
588 | for (set = 0; set < FEAT_MAX; set++) { | |
589 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
590 | char *name = btrfs_unknown_feature_names[set][i]; | |
591 | fa = &btrfs_feature_attrs[set][i]; | |
592 | ||
593 | if (fa->kobj_attr.attr.name) | |
594 | continue; | |
595 | ||
596 | snprintf(name, 13, "%s:%u", | |
597 | btrfs_feature_set_names[set], i); | |
598 | ||
599 | fa->kobj_attr.attr.name = name; | |
600 | fa->kobj_attr.attr.mode = S_IRUGO; | |
601 | fa->feature_set = set; | |
602 | fa->feature_bit = 1ULL << i; | |
603 | } | |
604 | } | |
605 | } | |
606 | ||
29e5be24 JM |
607 | static int add_device_membership(struct btrfs_fs_info *fs_info) |
608 | { | |
609 | int error = 0; | |
610 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
611 | struct btrfs_device *dev; | |
612 | ||
613 | fs_info->device_dir_kobj = kobject_create_and_add("devices", | |
614 | &fs_info->super_kobj); | |
615 | if (!fs_info->device_dir_kobj) | |
616 | return -ENOMEM; | |
617 | ||
618 | list_for_each_entry(dev, &fs_devices->devices, dev_list) { | |
f085381e AJ |
619 | struct hd_struct *disk; |
620 | struct kobject *disk_kobj; | |
621 | ||
622 | if (!dev->bdev) | |
623 | continue; | |
624 | ||
625 | disk = dev->bdev->bd_part; | |
626 | disk_kobj = &part_to_dev(disk)->kobj; | |
29e5be24 JM |
627 | |
628 | error = sysfs_create_link(fs_info->device_dir_kobj, | |
629 | disk_kobj, disk_kobj->name); | |
630 | if (error) | |
631 | break; | |
632 | } | |
633 | ||
634 | return error; | |
635 | } | |
636 | ||
510d7360 JM |
637 | /* /sys/fs/btrfs/ entry */ |
638 | static struct kset *btrfs_kset; | |
639 | ||
1bae3098 DS |
640 | /* /sys/kernel/debug/btrfs */ |
641 | static struct dentry *btrfs_debugfs_root_dentry; | |
642 | ||
643 | /* Debugging tunables and exported data */ | |
644 | u64 btrfs_debugfs_test; | |
645 | ||
5ac1d209 JM |
646 | int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) |
647 | { | |
648 | int error; | |
649 | ||
650 | init_completion(&fs_info->kobj_unregister); | |
510d7360 | 651 | fs_info->super_kobj.kset = btrfs_kset; |
5ac1d209 JM |
652 | error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, |
653 | "%pU", fs_info->fsid); | |
e453d989 JM |
654 | if (error) |
655 | return error; | |
510d7360 JM |
656 | |
657 | error = sysfs_create_group(&fs_info->super_kobj, | |
658 | &btrfs_feature_attr_group); | |
e453d989 JM |
659 | if (error) { |
660 | __btrfs_sysfs_remove_one(fs_info); | |
661 | return error; | |
662 | } | |
79da4fa4 | 663 | |
e453d989 | 664 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
665 | if (error) |
666 | goto failure; | |
667 | ||
29e5be24 JM |
668 | error = add_device_membership(fs_info); |
669 | if (error) | |
670 | goto failure; | |
671 | ||
6ab0a202 JM |
672 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
673 | &fs_info->super_kobj); | |
674 | if (!fs_info->space_info_kobj) { | |
675 | error = -ENOMEM; | |
676 | goto failure; | |
677 | } | |
678 | ||
679 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
680 | if (error) | |
681 | goto failure; | |
682 | ||
79da4fa4 JM |
683 | return 0; |
684 | failure: | |
685 | btrfs_sysfs_remove_one(fs_info); | |
5ac1d209 JM |
686 | return error; |
687 | } | |
688 | ||
1bae3098 DS |
689 | static int btrfs_init_debugfs(void) |
690 | { | |
691 | #ifdef CONFIG_DEBUG_FS | |
692 | btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); | |
693 | if (!btrfs_debugfs_root_dentry) | |
694 | return -ENOMEM; | |
695 | ||
696 | debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, | |
697 | &btrfs_debugfs_test); | |
698 | #endif | |
699 | return 0; | |
700 | } | |
701 | ||
b214107e | 702 | int btrfs_init_sysfs(void) |
58176a96 | 703 | { |
079b72bc | 704 | int ret; |
1bae3098 | 705 | |
e3fe4e71 GK |
706 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
707 | if (!btrfs_kset) | |
708 | return -ENOMEM; | |
079b72bc | 709 | |
1bae3098 DS |
710 | ret = btrfs_init_debugfs(); |
711 | if (ret) | |
712 | return ret; | |
79da4fa4 | 713 | |
1bae3098 | 714 | init_feature_attrs(); |
079b72bc | 715 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
079b72bc | 716 | |
1bae3098 | 717 | return ret; |
58176a96 JB |
718 | } |
719 | ||
b214107e | 720 | void btrfs_exit_sysfs(void) |
58176a96 | 721 | { |
079b72bc | 722 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
e3fe4e71 | 723 | kset_unregister(btrfs_kset); |
1bae3098 | 724 | debugfs_remove_recursive(btrfs_debugfs_root_dentry); |
58176a96 | 725 | } |
55d47414 | 726 |