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btrfs: use BTRFS_ATTR instead of btrfs_no_store()
[linux-2.6-block.git] / fs / btrfs / sysfs.c
CommitLineData
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 35static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
5ac1d209 36
510d7360
JM		 37static 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		 49static 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
61static 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		 92static 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		 108static 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		 176static 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
198BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
199BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
200BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
201BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
079b72bc
JM		 202BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
203BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
204BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
205BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
c736c095 206BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
079b72bc
JM		 207
208static 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
221static 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		 227static 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
238static 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}
245BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show);
246
247static 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}
254BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show);
255
256#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
c1895442 257#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
6ab0a202
JM		 258
259static ssize_t raid_bytes_show(struct kobject *kobj,
260 struct kobj_attribute *attr, char *buf);
261BTRFS_RAID_ATTR(total_bytes, raid_bytes_show);
262BTRFS_RAID_ATTR(used_bytes, raid_bytes_show);
263
264static ssize_t raid_bytes_show(struct kobject *kobj,
265 struct kobj_attribute *attr, char *buf)
266
267{
268 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
269 struct btrfs_block_group_cache *block_group;
c1895442 270 int index = to_raid_kobj(kobj)->raid_type;
6ab0a202
JM		 271 u64 val = 0;
272
273 down_read(&sinfo->groups_sem);
274 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
275 if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes))
276 val += block_group->key.offset;
277 else
278 val += btrfs_block_group_used(&block_group->item);
279 }
280 up_read(&sinfo->groups_sem);
281 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
282}
283
284static struct attribute *raid_attributes[] = {
285 BTRFS_RAID_ATTR_PTR(total_bytes),
286 BTRFS_RAID_ATTR_PTR(used_bytes),
287 NULL
288};
289
290static void release_raid_kobj(struct kobject *kobj)
291{
c1895442 292 kfree(to_raid_kobj(kobj));
6ab0a202
JM		 293}
294
295struct kobj_type btrfs_raid_ktype = {
296 .sysfs_ops = &kobj_sysfs_ops,
297 .release = release_raid_kobj,
298 .default_attrs = raid_attributes,
299};
300
301#define SPACE_INFO_ATTR(field) \
302static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
303 struct kobj_attribute *a, \
304 char *buf) \
305{ \
306 struct btrfs_space_info *sinfo = to_space_info(kobj); \
307 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
308} \
309BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field)
310
311static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
312 struct kobj_attribute *a,
313 char *buf)
314{
315 struct btrfs_space_info *sinfo = to_space_info(kobj);
316 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
317 return snprintf(buf, PAGE_SIZE, "%lld\n", val);
318}
319
320SPACE_INFO_ATTR(flags);
321SPACE_INFO_ATTR(total_bytes);
322SPACE_INFO_ATTR(bytes_used);
323SPACE_INFO_ATTR(bytes_pinned);
324SPACE_INFO_ATTR(bytes_reserved);
325SPACE_INFO_ATTR(bytes_may_use);
326SPACE_INFO_ATTR(disk_used);
327SPACE_INFO_ATTR(disk_total);
328BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned);
329
330static struct attribute *space_info_attrs[] = {
331 BTRFS_ATTR_PTR(flags),
332 BTRFS_ATTR_PTR(total_bytes),
333 BTRFS_ATTR_PTR(bytes_used),
334 BTRFS_ATTR_PTR(bytes_pinned),
335 BTRFS_ATTR_PTR(bytes_reserved),
336 BTRFS_ATTR_PTR(bytes_may_use),
337 BTRFS_ATTR_PTR(disk_used),
338 BTRFS_ATTR_PTR(disk_total),
339 BTRFS_ATTR_PTR(total_bytes_pinned),
340 NULL,
341};
342
343static void space_info_release(struct kobject *kobj)
344{
345 struct btrfs_space_info *sinfo = to_space_info(kobj);
346 percpu_counter_destroy(&sinfo->total_bytes_pinned);
347 kfree(sinfo);
348}
349
350struct kobj_type space_info_ktype = {
351 .sysfs_ops = &kobj_sysfs_ops,
352 .release = space_info_release,
353 .default_attrs = space_info_attrs,
354};
355
356static const struct attribute *allocation_attrs[] = {
357 BTRFS_ATTR_PTR(global_rsv_reserved),
358 BTRFS_ATTR_PTR(global_rsv_size),
359 NULL,
360};
361
f8ba9c11
JM		 362static ssize_t btrfs_label_show(struct kobject *kobj,
363 struct kobj_attribute *a, char *buf)
364{
365 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
48fcc3ff
ST		 366 char *label = fs_info->super_copy->label;
367 return snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
f8ba9c11
JM		 368}
369
370static ssize_t btrfs_label_store(struct kobject *kobj,
371 struct kobj_attribute *a,
372 const char *buf, size_t len)
373{
374 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
375 struct btrfs_trans_handle *trans;
376 struct btrfs_root *root = fs_info->fs_root;
377 int ret;
48fcc3ff 378 size_t p_len;
f8ba9c11 379
48fcc3ff
ST		 380 /*
381 * p_len is the len until the first occurrence of either
382 * '\n' or '\0'
383 */
384 p_len = strcspn(buf, "\n");
385
386 if (p_len >= BTRFS_LABEL_SIZE)
f8ba9c11 387 return -EINVAL;
f8ba9c11
JM		 388
389 trans = btrfs_start_transaction(root, 0);
390 if (IS_ERR(trans))
391 return PTR_ERR(trans);
392
393 spin_lock(&root->fs_info->super_lock);
48fcc3ff
ST		 394 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
395 memcpy(fs_info->super_copy->label, buf, p_len);
f8ba9c11
JM		 396 spin_unlock(&root->fs_info->super_lock);
397 ret = btrfs_commit_transaction(trans, root);
398
399 if (!ret)
400 return len;
401
402 return ret;
403}
404BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store);
405
df93589a
DS		 406static ssize_t btrfs_nodesize_show(struct kobject *kobj,
407 struct kobj_attribute *a, char *buf)
408{
409 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
410
411 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
412}
413
3f4b57e0 414BTRFS_ATTR(nodesize, 0444, btrfs_nodesize_show);
df93589a
DS		 415
416static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
417 struct kobj_attribute *a, char *buf)
418{
419 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
420
421 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
422}
423
3f4b57e0 424BTRFS_ATTR(sectorsize, 0444, btrfs_sectorsize_show);
df93589a
DS		 425
426static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
427 struct kobj_attribute *a, char *buf)
428{
429 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
430
431 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
432}
433
3f4b57e0 434BTRFS_ATTR(clone_alignment, 0444, btrfs_clone_alignment_show);
df93589a 435
f8ba9c11
JM		 436static struct attribute *btrfs_attrs[] = {
437 BTRFS_ATTR_PTR(label),
df93589a
DS		 438 BTRFS_ATTR_PTR(nodesize),
439 BTRFS_ATTR_PTR(sectorsize),
440 BTRFS_ATTR_PTR(clone_alignment),
f8ba9c11
JM		 441 NULL,
442};
443
510d7360
JM		 444static void btrfs_release_super_kobj(struct kobject *kobj)
445{
446 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
447 complete(&fs_info->kobj_unregister);
448}
449
450static struct kobj_type btrfs_ktype = {
451 .sysfs_ops = &kobj_sysfs_ops,
452 .release = btrfs_release_super_kobj,
f8ba9c11 453 .default_attrs = btrfs_attrs,
510d7360
JM		 454};
455
456static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
457{
458 if (kobj->ktype != &btrfs_ktype)
459 return NULL;
460 return container_of(kobj, struct btrfs_fs_info, super_kobj);
461}
58176a96 462
e453d989
JM		 463#define NUM_FEATURE_BITS 64
464static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
465static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
466
467static u64 supported_feature_masks[3] = {
468 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
469 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
470 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
471};
472
473static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
474{
475 int set;
476
477 for (set = 0; set < FEAT_MAX; set++) {
478 int i;
479 struct attribute *attrs[2];
480 struct attribute_group agroup = {
481 .name = "features",
482 .attrs = attrs,
483 };
484 u64 features = get_features(fs_info, set);
485 features &= ~supported_feature_masks[set];
486
487 if (!features)
488 continue;
489
490 attrs[1] = NULL;
491 for (i = 0; i < NUM_FEATURE_BITS; i++) {
492 struct btrfs_feature_attr *fa;
493
494 if (!(features & (1ULL << i)))
495 continue;
496
497 fa = &btrfs_feature_attrs[set][i];
498 attrs[0] = &fa->kobj_attr.attr;
499 if (add) {
500 int ret;
501 ret = sysfs_merge_group(&fs_info->super_kobj,
502 &agroup);
503 if (ret)
504 return ret;
505 } else
506 sysfs_unmerge_group(&fs_info->super_kobj,
507 &agroup);
508 }
509
510 }
511 return 0;
512}
513
514static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
5ac1d209
JM		 515{
516 kobject_del(&fs_info->super_kobj);
517 kobject_put(&fs_info->super_kobj);
518 wait_for_completion(&fs_info->kobj_unregister);
519}
520
e453d989
JM		 521void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
522{
523 if (fs_info->space_info_kobj) {
524 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
525 kobject_del(fs_info->space_info_kobj);
526 kobject_put(fs_info->space_info_kobj);
527 }
528 kobject_del(fs_info->device_dir_kobj);
529 kobject_put(fs_info->device_dir_kobj);
530 addrm_unknown_feature_attrs(fs_info, false);
531 sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group);
532 __btrfs_sysfs_remove_one(fs_info);
533}
534
79da4fa4
JM		 535const char * const btrfs_feature_set_names[3] = {
536 [FEAT_COMPAT] = "compat",
537 [FEAT_COMPAT_RO] = "compat_ro",
538 [FEAT_INCOMPAT] = "incompat",
539};
540
3b02a68a
JM		 541char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
542{
543 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
544 int len = 0;
545 int i;
546 char *str;
547
548 str = kmalloc(bufsize, GFP_KERNEL);
549 if (!str)
550 return str;
551
552 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
553 const char *name;
554
555 if (!(flags & (1ULL << i)))
556 continue;
557
558 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
559 len += snprintf(str + len, bufsize - len, "%s%s",
560 len ? "," : "", name);
561 }
562
563 return str;
564}
565
79da4fa4
JM		 566static void init_feature_attrs(void)
567{
568 struct btrfs_feature_attr *fa;
569 int set, i;
570
571 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
572 ARRAY_SIZE(btrfs_feature_attrs));
573 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
574 ARRAY_SIZE(btrfs_feature_attrs[0]));
575
3b02a68a
JM		 576 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
577 memset(btrfs_unknown_feature_names, 0,
578 sizeof(btrfs_unknown_feature_names));
579
79da4fa4
JM		 580 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
581 struct btrfs_feature_attr *sfa;
582 struct attribute *a = btrfs_supported_feature_attrs[i];
3b02a68a 583 int bit;
79da4fa4 584 sfa = attr_to_btrfs_feature_attr(a);
3b02a68a
JM		 585 bit = ilog2(sfa->feature_bit);
586 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
79da4fa4
JM		 587
588 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
589 }
590
591 for (set = 0; set < FEAT_MAX; set++) {
592 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
593 char *name = btrfs_unknown_feature_names[set][i];
594 fa = &btrfs_feature_attrs[set][i];
595
596 if (fa->kobj_attr.attr.name)
597 continue;
598
599 snprintf(name, 13, "%s:%u",
600 btrfs_feature_set_names[set], i);
601
602 fa->kobj_attr.attr.name = name;
603 fa->kobj_attr.attr.mode = S_IRUGO;
604 fa->feature_set = set;
605 fa->feature_bit = 1ULL << i;
606 }
607 }
608}
609
99994cde
AJ		 610int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
611 struct btrfs_device *one_device)
612{
613 struct hd_struct *disk;
614 struct kobject *disk_kobj;
615
616 if (!fs_info->device_dir_kobj)
617 return -EINVAL;
618
87fa3bb0 619 if (one_device && one_device->bdev) {
99994cde
AJ		 620 disk = one_device->bdev->bd_part;
621 disk_kobj = &part_to_dev(disk)->kobj;
622
623 sysfs_remove_link(fs_info->device_dir_kobj,
624 disk_kobj->name);
625 }
626
627 return 0;
628}
629
0d39376a
AJ		 630int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
631 struct btrfs_device *one_device)
29e5be24
JM		 632{
633 int error = 0;
634 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
635 struct btrfs_device *dev;
636
0d39376a
AJ		 637 if (!fs_info->device_dir_kobj)
638 fs_info->device_dir_kobj = kobject_create_and_add("devices",
29e5be24 639 &fs_info->super_kobj);
0d39376a 640
29e5be24
JM		 641 if (!fs_info->device_dir_kobj)
642 return -ENOMEM;
643
644 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
f085381e
AJ		 645 struct hd_struct *disk;
646 struct kobject *disk_kobj;
647
648 if (!dev->bdev)
649 continue;
650
0d39376a
AJ		 651 if (one_device && one_device != dev)
652 continue;
653
f085381e
AJ		 654 disk = dev->bdev->bd_part;
655 disk_kobj = &part_to_dev(disk)->kobj;
29e5be24
JM		 656
657 error = sysfs_create_link(fs_info->device_dir_kobj,
658 disk_kobj, disk_kobj->name);
659 if (error)
660 break;
661 }
662
663 return error;
664}
665
510d7360
JM		 666/* /sys/fs/btrfs/ entry */
667static struct kset *btrfs_kset;
668
1bae3098
DS		 669/* /sys/kernel/debug/btrfs */
670static struct dentry *btrfs_debugfs_root_dentry;
671
672/* Debugging tunables and exported data */
673u64 btrfs_debugfs_test;
674
5ac1d209
JM		 675int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
676{
677 int error;
678
679 init_completion(&fs_info->kobj_unregister);
510d7360 680 fs_info->super_kobj.kset = btrfs_kset;
5ac1d209
JM		 681 error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
682 "%pU", fs_info->fsid);
e453d989
JM		 683 if (error)
684 return error;
510d7360
JM		 685
686 error = sysfs_create_group(&fs_info->super_kobj,
687 &btrfs_feature_attr_group);
e453d989
JM		 688 if (error) {
689 __btrfs_sysfs_remove_one(fs_info);
690 return error;
691 }
79da4fa4 692
e453d989 693 error = addrm_unknown_feature_attrs(fs_info, true);
79da4fa4
JM		 694 if (error)
695 goto failure;
696
0d39376a 697 error = btrfs_kobj_add_device(fs_info, NULL);
29e5be24
JM		 698 if (error)
699 goto failure;
700
6ab0a202
JM		 701 fs_info->space_info_kobj = kobject_create_and_add("allocation",
702 &fs_info->super_kobj);
703 if (!fs_info->space_info_kobj) {
704 error = -ENOMEM;
705 goto failure;
706 }
707
708 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
709 if (error)
710 goto failure;
711
79da4fa4
JM		 712 return 0;
713failure:
714 btrfs_sysfs_remove_one(fs_info);
5ac1d209
JM		 715 return error;
716}
717
1bae3098
DS		 718static int btrfs_init_debugfs(void)
719{
720#ifdef CONFIG_DEBUG_FS
721 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
722 if (!btrfs_debugfs_root_dentry)
723 return -ENOMEM;
724
725 debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry,
726 &btrfs_debugfs_test);
727#endif
728 return 0;
729}
730
b214107e 731int btrfs_init_sysfs(void)
58176a96 732{
079b72bc 733 int ret;
1bae3098 734
e3fe4e71
GK		 735 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
736 if (!btrfs_kset)
737 return -ENOMEM;
079b72bc 738
1bae3098
DS		 739 ret = btrfs_init_debugfs();
740 if (ret)
741 return ret;
79da4fa4 742
1bae3098 743 init_feature_attrs();
079b72bc 744 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
079b72bc 745
1bae3098 746 return ret;
58176a96
JB		 747}
748
b214107e 749void btrfs_exit_sysfs(void)
58176a96 750{
079b72bc 751 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
e3fe4e71 752 kset_unregister(btrfs_kset);
1bae3098 753 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
58176a96 754}
55d47414 755
Linux 6.x block layer and io_uring tree(s)