blob: c6569905d3d1cc5058b7a7a67785a49d6e5d1104 [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
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
Josef Bacik58176a92007-08-29 15:47:34 -040019#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>
Josef Bacik58176a92007-08-29 15:47:34 -040024#include <linux/kobject.h>
Jeff Mahoney79da4fa2013-11-01 13:07:00 -040025#include <linux/bug.h>
Jeff Mahoney29e5be22013-11-01 13:07:05 -040026#include <linux/genhd.h>
David Sterba1bae3092014-02-05 15:36:18 +010027#include <linux/debugfs.h>
Josef Bacik58176a92007-08-29 15:47:34 -040028
Chris Masonbae45de2007-04-04 21:22:22 -040029#include "ctree.h"
30#include "disk-io.h"
31#include "transaction.h"
Jeff Mahoney079b72b2013-11-01 13:06:57 -040032#include "sysfs.h"
Jeff Mahoney29e5be22013-11-01 13:07:05 -040033#include "volumes.h"
Jeff Mahoney079b72b2013-11-01 13:06:57 -040034
Jeff Mahoney510d7362013-11-01 13:06:59 -040035static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
Anand Jain2e7910d2015-03-10 06:38:29 +080036static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
Jeff Mahoney5ac1d202013-11-01 13:06:58 -040037
Jeff Mahoney510d7362013-11-01 13:06:59 -040038static u64 get_features(struct btrfs_fs_info *fs_info,
39 enum btrfs_feature_set set)
Jeff Mahoney5ac1d202013-11-01 13:06:58 -040040{
Jeff Mahoney510d7362013-11-01 13:06:59 -040041 struct btrfs_super_block *disk_super = fs_info->super_copy;
42 if (set == FEAT_COMPAT)
43 return btrfs_super_compat_flags(disk_super);
44 else if (set == FEAT_COMPAT_RO)
45 return btrfs_super_compat_ro_flags(disk_super);
46 else
47 return btrfs_super_incompat_flags(disk_super);
Jeff Mahoney5ac1d202013-11-01 13:06:58 -040048}
49
Jeff Mahoneyba631942013-11-01 13:07:01 -040050static void set_features(struct btrfs_fs_info *fs_info,
51 enum btrfs_feature_set set, u64 features)
52{
53 struct btrfs_super_block *disk_super = fs_info->super_copy;
54 if (set == FEAT_COMPAT)
55 btrfs_set_super_compat_flags(disk_super, features);
56 else if (set == FEAT_COMPAT_RO)
57 btrfs_set_super_compat_ro_flags(disk_super, features);
58 else
59 btrfs_set_super_incompat_flags(disk_super, features);
60}
61
62static int can_modify_feature(struct btrfs_feature_attr *fa)
63{
64 int val = 0;
65 u64 set, clear;
66 switch (fa->feature_set) {
67 case FEAT_COMPAT:
68 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
69 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
70 break;
71 case FEAT_COMPAT_RO:
72 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
73 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
74 break;
75 case FEAT_INCOMPAT:
76 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
77 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
78 break;
79 default:
David Sterbacc37bb02013-11-19 13:36:21 +010080 printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n",
81 fa->feature_set);
82 return 0;
Jeff Mahoneyba631942013-11-01 13:07:01 -040083 }
84
85 if (set & fa->feature_bit)
86 val |= 1;
87 if (clear & fa->feature_bit)
88 val |= 2;
89
90 return val;
91}
92
Jeff Mahoney079b72b2013-11-01 13:06:57 -040093static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
94 struct kobj_attribute *a, char *buf)
95{
Jeff Mahoney510d7362013-11-01 13:06:59 -040096 int val = 0;
97 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
Jeff Mahoneyba631942013-11-01 13:07:01 -040098 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
Jeff Mahoney510d7362013-11-01 13:06:59 -040099 if (fs_info) {
Jeff Mahoney510d7362013-11-01 13:06:59 -0400100 u64 features = get_features(fs_info, fa->feature_set);
101 if (features & fa->feature_bit)
102 val = 1;
Jeff Mahoneyba631942013-11-01 13:07:01 -0400103 } else
104 val = can_modify_feature(fa);
Jeff Mahoney510d7362013-11-01 13:06:59 -0400105
106 return snprintf(buf, PAGE_SIZE, "%d\n", val);
107}
108
Jeff Mahoneyba631942013-11-01 13:07:01 -0400109static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
110 struct kobj_attribute *a,
111 const char *buf, size_t count)
112{
113 struct btrfs_fs_info *fs_info;
114 struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
Jeff Mahoneyba631942013-11-01 13:07:01 -0400115 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
David Sterbaee611132015-01-23 18:43:31 +0100123 if (fs_info->sb->s_flags & MS_RDONLY)
124 return -EROFS;
125
Jeff Mahoneyba631942013-11-01 13:07:01 -0400126 ret = kstrtoul(skip_spaces(buf), 0, &val);
127 if (ret)
128 return ret;
129
130 if (fa->feature_set == FEAT_COMPAT) {
131 set = BTRFS_FEATURE_COMPAT_SAFE_SET;
132 clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
133 } else if (fa->feature_set == FEAT_COMPAT_RO) {
134 set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
135 clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
136 } else {
137 set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
138 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
139 }
140
141 features = get_features(fs_info, fa->feature_set);
142
143 /* Nothing to do */
144 if ((val && (features & fa->feature_bit)) ||
145 (!val && !(features & fa->feature_bit)))
146 return count;
147
148 if ((val && !(set & fa->feature_bit)) ||
149 (!val && !(clear & fa->feature_bit))) {
150 btrfs_info(fs_info,
151 "%sabling feature %s on mounted fs is not supported.",
152 val ? "En" : "Dis", fa->kobj_attr.attr.name);
153 return -EPERM;
154 }
155
156 btrfs_info(fs_info, "%s %s feature flag",
157 val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
158
Jeff Mahoneyba631942013-11-01 13:07:01 -0400159 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
David Sterba0eae2742014-11-12 14:22:21 +0100168 /*
169 * We don't want to do full transaction commit from inside sysfs
170 */
171 btrfs_set_pending(fs_info, COMMIT);
172 wake_up_process(fs_info->transaction_kthread);
Jeff Mahoneyba631942013-11-01 13:07:01 -0400173
174 return count;
175}
176
Jeff Mahoney510d7362013-11-01 13:06:59 -0400177static umode_t btrfs_feature_visible(struct kobject *kobj,
178 struct attribute *attr, int unused)
179{
180 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
181 umode_t mode = attr->mode;
182
183 if (fs_info) {
184 struct btrfs_feature_attr *fa;
185 u64 features;
186
187 fa = attr_to_btrfs_feature_attr(attr);
188 features = get_features(fs_info, fa->feature_set);
189
Jeff Mahoneyba631942013-11-01 13:07:01 -0400190 if (can_modify_feature(fa))
191 mode |= S_IWUSR;
192 else if (!(features & fa->feature_bit))
Jeff Mahoney510d7362013-11-01 13:06:59 -0400193 mode = 0;
194 }
195
196 return mode;
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400197}
198
199BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
200BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
201BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
202BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400203BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
204BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
205BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
206BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
David Sterbac736c092014-01-21 18:56:09 +0100207BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
David Sterba3b5bb732016-01-21 18:36:46 +0100208BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400209
210static struct attribute *btrfs_supported_feature_attrs[] = {
211 BTRFS_FEAT_ATTR_PTR(mixed_backref),
212 BTRFS_FEAT_ATTR_PTR(default_subvol),
213 BTRFS_FEAT_ATTR_PTR(mixed_groups),
214 BTRFS_FEAT_ATTR_PTR(compress_lzo),
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400215 BTRFS_FEAT_ATTR_PTR(big_metadata),
216 BTRFS_FEAT_ATTR_PTR(extended_iref),
217 BTRFS_FEAT_ATTR_PTR(raid56),
218 BTRFS_FEAT_ATTR_PTR(skinny_metadata),
David Sterbac736c092014-01-21 18:56:09 +0100219 BTRFS_FEAT_ATTR_PTR(no_holes),
David Sterba3b5bb732016-01-21 18:36:46 +0100220 BTRFS_FEAT_ATTR_PTR(free_space_tree),
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400221 NULL
222};
223
224static const struct attribute_group btrfs_feature_attr_group = {
225 .name = "features",
Jeff Mahoney510d7362013-11-01 13:06:59 -0400226 .is_visible = btrfs_feature_visible,
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400227 .attrs = btrfs_supported_feature_attrs,
228};
Josef Bacik58176a92007-08-29 15:47:34 -0400229
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400230static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
231{
232 u64 val;
233 if (lock)
234 spin_lock(lock);
235 val = *value_ptr;
236 if (lock)
237 spin_unlock(lock);
238 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
239}
240
241static ssize_t global_rsv_size_show(struct kobject *kobj,
242 struct kobj_attribute *ka, char *buf)
243{
244 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
245 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
246 return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
247}
Anand Jain98b3d382014-07-30 20:04:08 +0800248BTRFS_ATTR(global_rsv_size, global_rsv_size_show);
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400249
250static ssize_t global_rsv_reserved_show(struct kobject *kobj,
251 struct kobj_attribute *a, char *buf)
252{
253 struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
254 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
255 return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
256}
Anand Jain98b3d382014-07-30 20:04:08 +0800257BTRFS_ATTR(global_rsv_reserved, global_rsv_reserved_show);
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400258
259#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
Jeff Mahoneyc1895442014-05-27 12:59:57 -0400260#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400261
262static ssize_t raid_bytes_show(struct kobject *kobj,
263 struct kobj_attribute *attr, char *buf);
264BTRFS_RAID_ATTR(total_bytes, raid_bytes_show);
265BTRFS_RAID_ATTR(used_bytes, raid_bytes_show);
266
267static ssize_t raid_bytes_show(struct kobject *kobj,
268 struct kobj_attribute *attr, char *buf)
269
270{
271 struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
272 struct btrfs_block_group_cache *block_group;
Jeff Mahoneyc1895442014-05-27 12:59:57 -0400273 int index = to_raid_kobj(kobj)->raid_type;
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400274 u64 val = 0;
275
276 down_read(&sinfo->groups_sem);
277 list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
278 if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes))
279 val += block_group->key.offset;
280 else
281 val += btrfs_block_group_used(&block_group->item);
282 }
283 up_read(&sinfo->groups_sem);
284 return snprintf(buf, PAGE_SIZE, "%llu\n", val);
285}
286
287static struct attribute *raid_attributes[] = {
288 BTRFS_RAID_ATTR_PTR(total_bytes),
289 BTRFS_RAID_ATTR_PTR(used_bytes),
290 NULL
291};
292
293static void release_raid_kobj(struct kobject *kobj)
294{
Jeff Mahoneyc1895442014-05-27 12:59:57 -0400295 kfree(to_raid_kobj(kobj));
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400296}
297
298struct kobj_type btrfs_raid_ktype = {
299 .sysfs_ops = &kobj_sysfs_ops,
300 .release = release_raid_kobj,
301 .default_attrs = raid_attributes,
302};
303
304#define SPACE_INFO_ATTR(field) \
305static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
306 struct kobj_attribute *a, \
307 char *buf) \
308{ \
309 struct btrfs_space_info *sinfo = to_space_info(kobj); \
310 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
311} \
Anand Jain98b3d382014-07-30 20:04:08 +0800312BTRFS_ATTR(field, btrfs_space_info_show_##field)
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400313
314static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj,
315 struct kobj_attribute *a,
316 char *buf)
317{
318 struct btrfs_space_info *sinfo = to_space_info(kobj);
319 s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
320 return snprintf(buf, PAGE_SIZE, "%lld\n", val);
321}
322
323SPACE_INFO_ATTR(flags);
324SPACE_INFO_ATTR(total_bytes);
325SPACE_INFO_ATTR(bytes_used);
326SPACE_INFO_ATTR(bytes_pinned);
327SPACE_INFO_ATTR(bytes_reserved);
328SPACE_INFO_ATTR(bytes_may_use);
Wang Xiaoguangc1fd5c32016-06-21 11:12:56 +0800329SPACE_INFO_ATTR(bytes_readonly);
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400330SPACE_INFO_ATTR(disk_used);
331SPACE_INFO_ATTR(disk_total);
Anand Jain98b3d382014-07-30 20:04:08 +0800332BTRFS_ATTR(total_bytes_pinned, btrfs_space_info_show_total_bytes_pinned);
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400333
334static struct attribute *space_info_attrs[] = {
335 BTRFS_ATTR_PTR(flags),
336 BTRFS_ATTR_PTR(total_bytes),
337 BTRFS_ATTR_PTR(bytes_used),
338 BTRFS_ATTR_PTR(bytes_pinned),
339 BTRFS_ATTR_PTR(bytes_reserved),
340 BTRFS_ATTR_PTR(bytes_may_use),
Wang Xiaoguangc1fd5c32016-06-21 11:12:56 +0800341 BTRFS_ATTR_PTR(bytes_readonly),
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400342 BTRFS_ATTR_PTR(disk_used),
343 BTRFS_ATTR_PTR(disk_total),
344 BTRFS_ATTR_PTR(total_bytes_pinned),
345 NULL,
346};
347
348static void space_info_release(struct kobject *kobj)
349{
350 struct btrfs_space_info *sinfo = to_space_info(kobj);
351 percpu_counter_destroy(&sinfo->total_bytes_pinned);
352 kfree(sinfo);
353}
354
355struct kobj_type space_info_ktype = {
356 .sysfs_ops = &kobj_sysfs_ops,
357 .release = space_info_release,
358 .default_attrs = space_info_attrs,
359};
360
361static const struct attribute *allocation_attrs[] = {
362 BTRFS_ATTR_PTR(global_rsv_reserved),
363 BTRFS_ATTR_PTR(global_rsv_size),
364 NULL,
365};
366
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400367static ssize_t btrfs_label_show(struct kobject *kobj,
368 struct kobj_attribute *a, char *buf)
369{
370 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
Satoru Takeuchi48fcc3f2014-07-01 17:00:07 +0900371 char *label = fs_info->super_copy->label;
David Sterbaee17fc82016-04-26 16:22:06 +0200372 ssize_t ret;
373
374 spin_lock(&fs_info->super_lock);
375 ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
376 spin_unlock(&fs_info->super_lock);
377
378 return ret;
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400379}
380
381static ssize_t btrfs_label_store(struct kobject *kobj,
382 struct kobj_attribute *a,
383 const char *buf, size_t len)
384{
385 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
Satoru Takeuchi48fcc3f2014-07-01 17:00:07 +0900386 size_t p_len;
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400387
David Sterba66ac9fe2016-04-26 16:03:57 +0200388 if (!fs_info)
389 return -EPERM;
390
Anand Jain79aec2b2014-07-30 20:04:10 +0800391 if (fs_info->sb->s_flags & MS_RDONLY)
392 return -EROFS;
393
Satoru Takeuchi48fcc3f2014-07-01 17:00:07 +0900394 /*
395 * p_len is the len until the first occurrence of either
396 * '\n' or '\0'
397 */
398 p_len = strcspn(buf, "\n");
399
400 if (p_len >= BTRFS_LABEL_SIZE)
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400401 return -EINVAL;
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400402
David Sterbaa6f69dc2014-05-30 19:29:05 +0200403 spin_lock(&fs_info->super_lock);
Satoru Takeuchi48fcc3f2014-07-01 17:00:07 +0900404 memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
405 memcpy(fs_info->super_copy->label, buf, p_len);
David Sterbaa6f69dc2014-05-30 19:29:05 +0200406 spin_unlock(&fs_info->super_lock);
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400407
David Sterbaa6f69dc2014-05-30 19:29:05 +0200408 /*
409 * We don't want to do full transaction commit from inside sysfs
410 */
411 btrfs_set_pending(fs_info, COMMIT);
412 wake_up_process(fs_info->transaction_kthread);
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400413
David Sterbaa6f69dc2014-05-30 19:29:05 +0200414 return len;
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400415}
Anand Jain20ee0822014-07-30 20:04:09 +0800416BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400417
David Sterbadf935892014-05-07 18:17:16 +0200418static ssize_t btrfs_nodesize_show(struct kobject *kobj,
419 struct kobj_attribute *a, char *buf)
420{
421 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
422
423 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
424}
425
Anand Jain98b3d382014-07-30 20:04:08 +0800426BTRFS_ATTR(nodesize, btrfs_nodesize_show);
David Sterbadf935892014-05-07 18:17:16 +0200427
428static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
429 struct kobj_attribute *a, char *buf)
430{
431 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
432
433 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
434}
435
Anand Jain98b3d382014-07-30 20:04:08 +0800436BTRFS_ATTR(sectorsize, btrfs_sectorsize_show);
David Sterbadf935892014-05-07 18:17:16 +0200437
438static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
439 struct kobj_attribute *a, char *buf)
440{
441 struct btrfs_fs_info *fs_info = to_fs_info(kobj);
442
443 return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->sectorsize);
444}
445
Anand Jain98b3d382014-07-30 20:04:08 +0800446BTRFS_ATTR(clone_alignment, btrfs_clone_alignment_show);
David Sterbadf935892014-05-07 18:17:16 +0200447
Anand Jain0dd29062015-03-10 06:38:27 +0800448static const struct attribute *btrfs_attrs[] = {
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400449 BTRFS_ATTR_PTR(label),
David Sterbadf935892014-05-07 18:17:16 +0200450 BTRFS_ATTR_PTR(nodesize),
451 BTRFS_ATTR_PTR(sectorsize),
452 BTRFS_ATTR_PTR(clone_alignment),
Jeff Mahoneyf8ba9c12013-11-01 13:07:06 -0400453 NULL,
454};
455
Anand Jainc1b7e472015-08-14 18:32:50 +0800456static void btrfs_release_fsid_kobj(struct kobject *kobj)
Jeff Mahoney510d7362013-11-01 13:06:59 -0400457{
Anand Jain2e7910d2015-03-10 06:38:29 +0800458 struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
Anand Jain248d2002015-03-10 06:38:19 +0800459
Anand Jainc1b7e472015-08-14 18:32:50 +0800460 memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
Anand Jain2e7910d2015-03-10 06:38:29 +0800461 complete(&fs_devs->kobj_unregister);
Jeff Mahoney510d7362013-11-01 13:06:59 -0400462}
463
464static struct kobj_type btrfs_ktype = {
465 .sysfs_ops = &kobj_sysfs_ops,
Anand Jainc1b7e472015-08-14 18:32:50 +0800466 .release = btrfs_release_fsid_kobj,
Jeff Mahoney510d7362013-11-01 13:06:59 -0400467};
468
Anand Jain2e7910d2015-03-10 06:38:29 +0800469static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
470{
471 if (kobj->ktype != &btrfs_ktype)
472 return NULL;
Anand Jainc1b7e472015-08-14 18:32:50 +0800473 return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
Anand Jain2e7910d2015-03-10 06:38:29 +0800474}
475
Jeff Mahoney510d7362013-11-01 13:06:59 -0400476static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
477{
478 if (kobj->ktype != &btrfs_ktype)
479 return NULL;
Anand Jain2e7910d2015-03-10 06:38:29 +0800480 return to_fs_devs(kobj)->fs_info;
Jeff Mahoney510d7362013-11-01 13:06:59 -0400481}
Josef Bacik58176a92007-08-29 15:47:34 -0400482
Jeff Mahoneye453d982013-11-21 10:37:16 -0500483#define NUM_FEATURE_BITS 64
484static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
485static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
486
David Sterbae8c9f182015-01-02 18:23:10 +0100487static const u64 supported_feature_masks[3] = {
Jeff Mahoneye453d982013-11-21 10:37:16 -0500488 [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
489 [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
490 [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
491};
492
493static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
Jeff Mahoney5ac1d202013-11-01 13:06:58 -0400494{
Jeff Mahoneye453d982013-11-21 10:37:16 -0500495 int set;
496
497 for (set = 0; set < FEAT_MAX; set++) {
498 int i;
499 struct attribute *attrs[2];
500 struct attribute_group agroup = {
501 .name = "features",
502 .attrs = attrs,
503 };
504 u64 features = get_features(fs_info, set);
505 features &= ~supported_feature_masks[set];
506
507 if (!features)
508 continue;
509
510 attrs[1] = NULL;
511 for (i = 0; i < NUM_FEATURE_BITS; i++) {
512 struct btrfs_feature_attr *fa;
513
514 if (!(features & (1ULL << i)))
515 continue;
516
517 fa = &btrfs_feature_attrs[set][i];
518 attrs[0] = &fa->kobj_attr.attr;
519 if (add) {
520 int ret;
Anand Jainc1b7e472015-08-14 18:32:50 +0800521 ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
Jeff Mahoneye453d982013-11-21 10:37:16 -0500522 &agroup);
523 if (ret)
524 return ret;
525 } else
Anand Jainc1b7e472015-08-14 18:32:50 +0800526 sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
Jeff Mahoneye453d982013-11-21 10:37:16 -0500527 &agroup);
528 }
529
530 }
531 return 0;
532}
533
Anand Jain2e3e1282015-03-10 06:38:32 +0800534static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
Jeff Mahoneye453d982013-11-21 10:37:16 -0500535{
Anand Jain2e7910d2015-03-10 06:38:29 +0800536 if (fs_devs->device_dir_kobj) {
537 kobject_del(fs_devs->device_dir_kobj);
538 kobject_put(fs_devs->device_dir_kobj);
539 fs_devs->device_dir_kobj = NULL;
Anand Jainaaf13302015-03-10 06:38:24 +0800540 }
541
Anand Jainc1b7e472015-08-14 18:32:50 +0800542 if (fs_devs->fsid_kobj.state_initialized) {
543 kobject_del(&fs_devs->fsid_kobj);
544 kobject_put(&fs_devs->fsid_kobj);
Anand Jainf90fc542015-06-22 18:18:32 +0800545 wait_for_completion(&fs_devs->kobj_unregister);
546 }
Jeff Mahoney5ac1d202013-11-01 13:06:58 -0400547}
548
Anand Jain2e3e1282015-03-10 06:38:32 +0800549/* when fs_devs is NULL it will remove all fsid kobject */
Anand Jain1d1c1be2015-03-10 06:38:37 +0800550void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
Anand Jain2e3e1282015-03-10 06:38:32 +0800551{
552 struct list_head *fs_uuids = btrfs_get_fs_uuids();
553
554 if (fs_devs) {
555 __btrfs_sysfs_remove_fsid(fs_devs);
556 return;
557 }
558
559 list_for_each_entry(fs_devs, fs_uuids, list) {
560 __btrfs_sysfs_remove_fsid(fs_devs);
561 }
562}
563
Anand Jain6618a592015-08-14 18:32:47 +0800564void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
Jeff Mahoneye453d982013-11-21 10:37:16 -0500565{
Anand Jain5a13f432015-03-10 06:38:31 +0800566 btrfs_reset_fs_info_ptr(fs_info);
567
Jeff Mahoneye453d982013-11-21 10:37:16 -0500568 if (fs_info->space_info_kobj) {
569 sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
570 kobject_del(fs_info->space_info_kobj);
571 kobject_put(fs_info->space_info_kobj);
572 }
Jeff Mahoneye453d982013-11-21 10:37:16 -0500573 addrm_unknown_feature_attrs(fs_info, false);
Anand Jainc1b7e472015-08-14 18:32:50 +0800574 sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group);
575 sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs);
Anand Jain32576042015-08-14 18:32:49 +0800576 btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL);
Jeff Mahoneye453d982013-11-21 10:37:16 -0500577}
578
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400579const char * const btrfs_feature_set_names[3] = {
580 [FEAT_COMPAT] = "compat",
581 [FEAT_COMPAT_RO] = "compat_ro",
582 [FEAT_INCOMPAT] = "incompat",
583};
584
Jeff Mahoney3b02a682013-11-01 13:07:02 -0400585char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
586{
587 size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
588 int len = 0;
589 int i;
590 char *str;
591
592 str = kmalloc(bufsize, GFP_KERNEL);
593 if (!str)
594 return str;
595
596 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
597 const char *name;
598
599 if (!(flags & (1ULL << i)))
600 continue;
601
602 name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
603 len += snprintf(str + len, bufsize - len, "%s%s",
604 len ? "," : "", name);
605 }
606
607 return str;
608}
609
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400610static void init_feature_attrs(void)
611{
612 struct btrfs_feature_attr *fa;
613 int set, i;
614
615 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
616 ARRAY_SIZE(btrfs_feature_attrs));
617 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
618 ARRAY_SIZE(btrfs_feature_attrs[0]));
619
Jeff Mahoney3b02a682013-11-01 13:07:02 -0400620 memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
621 memset(btrfs_unknown_feature_names, 0,
622 sizeof(btrfs_unknown_feature_names));
623
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400624 for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
625 struct btrfs_feature_attr *sfa;
626 struct attribute *a = btrfs_supported_feature_attrs[i];
Jeff Mahoney3b02a682013-11-01 13:07:02 -0400627 int bit;
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400628 sfa = attr_to_btrfs_feature_attr(a);
Jeff Mahoney3b02a682013-11-01 13:07:02 -0400629 bit = ilog2(sfa->feature_bit);
630 fa = &btrfs_feature_attrs[sfa->feature_set][bit];
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400631
632 fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
633 }
634
635 for (set = 0; set < FEAT_MAX; set++) {
636 for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
637 char *name = btrfs_unknown_feature_names[set][i];
638 fa = &btrfs_feature_attrs[set][i];
639
640 if (fa->kobj_attr.attr.name)
641 continue;
642
643 snprintf(name, 13, "%s:%u",
644 btrfs_feature_set_names[set], i);
645
646 fa->kobj_attr.attr.name = name;
647 fa->kobj_attr.attr.mode = S_IRUGO;
648 fa->feature_set = set;
649 fa->feature_bit = 1ULL << i;
650 }
651 }
652}
653
Anand Jaine7e1aa92015-03-10 06:38:21 +0800654/* when one_device is NULL, it removes all device links */
655
Anand Jain32576042015-08-14 18:32:49 +0800656int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
Anand Jain99994cd2014-06-03 11:36:00 +0800657 struct btrfs_device *one_device)
658{
659 struct hd_struct *disk;
660 struct kobject *disk_kobj;
661
Anand Jain6c14a162015-03-10 06:38:34 +0800662 if (!fs_devices->device_dir_kobj)
Anand Jain99994cd2014-06-03 11:36:00 +0800663 return -EINVAL;
664
Liu Bo87fa3bb2014-07-29 19:09:39 +0800665 if (one_device && one_device->bdev) {
Anand Jain99994cd2014-06-03 11:36:00 +0800666 disk = one_device->bdev->bd_part;
667 disk_kobj = &part_to_dev(disk)->kobj;
668
Anand Jain6c14a162015-03-10 06:38:34 +0800669 sysfs_remove_link(fs_devices->device_dir_kobj,
Anand Jain99994cd2014-06-03 11:36:00 +0800670 disk_kobj->name);
671 }
672
Anand Jaine7e1aa92015-03-10 06:38:21 +0800673 if (one_device)
674 return 0;
675
676 list_for_each_entry(one_device,
Anand Jain6c14a162015-03-10 06:38:34 +0800677 &fs_devices->devices, dev_list) {
Anand Jaine7e1aa92015-03-10 06:38:21 +0800678 if (!one_device->bdev)
679 continue;
680 disk = one_device->bdev->bd_part;
681 disk_kobj = &part_to_dev(disk)->kobj;
682
Anand Jain6c14a162015-03-10 06:38:34 +0800683 sysfs_remove_link(fs_devices->device_dir_kobj,
Anand Jaine7e1aa92015-03-10 06:38:21 +0800684 disk_kobj->name);
685 }
686
Anand Jain99994cd2014-06-03 11:36:00 +0800687 return 0;
688}
689
Anand Jain2e7910d2015-03-10 06:38:29 +0800690int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
Anand Jain00c921c2015-03-10 06:38:28 +0800691{
Anand Jain2e7910d2015-03-10 06:38:29 +0800692 if (!fs_devs->device_dir_kobj)
693 fs_devs->device_dir_kobj = kobject_create_and_add("devices",
Anand Jainc1b7e472015-08-14 18:32:50 +0800694 &fs_devs->fsid_kobj);
Anand Jain00c921c2015-03-10 06:38:28 +0800695
Anand Jain2e7910d2015-03-10 06:38:29 +0800696 if (!fs_devs->device_dir_kobj)
Anand Jain00c921c2015-03-10 06:38:28 +0800697 return -ENOMEM;
698
699 return 0;
700}
701
Anand Jaine3bd6972015-08-14 18:32:48 +0800702int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
Anand Jain1ba43812015-03-10 06:38:33 +0800703 struct btrfs_device *one_device)
Jeff Mahoney29e5be22013-11-01 13:07:05 -0400704{
705 int error = 0;
Jeff Mahoney29e5be22013-11-01 13:07:05 -0400706 struct btrfs_device *dev;
707
Jeff Mahoney29e5be22013-11-01 13:07:05 -0400708 list_for_each_entry(dev, &fs_devices->devices, dev_list) {
Anand Jainf0853812014-01-15 17:22:28 +0800709 struct hd_struct *disk;
710 struct kobject *disk_kobj;
711
712 if (!dev->bdev)
713 continue;
714
Anand Jain0d393762014-06-03 11:36:01 +0800715 if (one_device && one_device != dev)
716 continue;
717
Anand Jainf0853812014-01-15 17:22:28 +0800718 disk = dev->bdev->bd_part;
719 disk_kobj = &part_to_dev(disk)->kobj;
Jeff Mahoney29e5be22013-11-01 13:07:05 -0400720
Anand Jain2e7910d2015-03-10 06:38:29 +0800721 error = sysfs_create_link(fs_devices->device_dir_kobj,
Jeff Mahoney29e5be22013-11-01 13:07:05 -0400722 disk_kobj, disk_kobj->name);
723 if (error)
724 break;
725 }
726
727 return error;
728}
729
Jeff Mahoney510d7362013-11-01 13:06:59 -0400730/* /sys/fs/btrfs/ entry */
731static struct kset *btrfs_kset;
732
David Sterba1bae3092014-02-05 15:36:18 +0100733/* /sys/kernel/debug/btrfs */
734static struct dentry *btrfs_debugfs_root_dentry;
735
736/* Debugging tunables and exported data */
737u64 btrfs_debugfs_test;
738
Anand Jain72059212015-03-10 06:38:26 +0800739/*
740 * Can be called by the device discovery thread.
741 * And parent can be specified for seed device
742 */
Anand Jain0c10e2d2015-03-10 06:38:35 +0800743int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
Anand Jain72059212015-03-10 06:38:26 +0800744 struct kobject *parent)
Jeff Mahoney5ac1d202013-11-01 13:06:58 -0400745{
746 int error;
747
Anand Jain2e7910d2015-03-10 06:38:29 +0800748 init_completion(&fs_devs->kobj_unregister);
Anand Jainc1b7e472015-08-14 18:32:50 +0800749 fs_devs->fsid_kobj.kset = btrfs_kset;
750 error = kobject_init_and_add(&fs_devs->fsid_kobj,
Anand Jain24bd69c2015-03-10 06:38:39 +0800751 &btrfs_ktype, parent, "%pU", fs_devs->fsid);
Anand Jain72059212015-03-10 06:38:26 +0800752 return error;
753}
754
Anand Jain96f31362015-08-14 18:32:46 +0800755int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
Anand Jain72059212015-03-10 06:38:26 +0800756{
757 int error;
Anand Jain2e7910d2015-03-10 06:38:29 +0800758 struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
Anand Jainc1b7e472015-08-14 18:32:50 +0800759 struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
Anand Jain72059212015-03-10 06:38:26 +0800760
Anand Jain5a13f432015-03-10 06:38:31 +0800761 btrfs_set_fs_info_ptr(fs_info);
762
Anand Jaine3bd6972015-08-14 18:32:48 +0800763 error = btrfs_sysfs_add_device_link(fs_devs, NULL);
Jeff Mahoneye453d982013-11-21 10:37:16 -0500764 if (error)
765 return error;
Jeff Mahoney510d7362013-11-01 13:06:59 -0400766
Anand Jainc1b7e472015-08-14 18:32:50 +0800767 error = sysfs_create_files(fsid_kobj, btrfs_attrs);
Jeff Mahoneye453d982013-11-21 10:37:16 -0500768 if (error) {
Anand Jain32576042015-08-14 18:32:49 +0800769 btrfs_sysfs_rm_device_link(fs_devs, NULL);
Jeff Mahoneye453d982013-11-21 10:37:16 -0500770 return error;
771 }
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400772
Anand Jainc1b7e472015-08-14 18:32:50 +0800773 error = sysfs_create_group(fsid_kobj,
Anand Jain0dd29062015-03-10 06:38:27 +0800774 &btrfs_feature_attr_group);
775 if (error)
776 goto failure;
777
Jeff Mahoneye453d982013-11-21 10:37:16 -0500778 error = addrm_unknown_feature_attrs(fs_info, true);
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400779 if (error)
780 goto failure;
781
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400782 fs_info->space_info_kobj = kobject_create_and_add("allocation",
Anand Jainc1b7e472015-08-14 18:32:50 +0800783 fsid_kobj);
Jeff Mahoney6ab0a202013-11-01 13:07:04 -0400784 if (!fs_info->space_info_kobj) {
785 error = -ENOMEM;
786 goto failure;
787 }
788
789 error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
790 if (error)
791 goto failure;
792
Jeff Mahoney79da4fa2013-11-01 13:07:00 -0400793 return 0;
794failure:
Anand Jain6618a592015-08-14 18:32:47 +0800795 btrfs_sysfs_remove_mounted(fs_info);
Jeff Mahoney5ac1d202013-11-01 13:06:58 -0400796 return error;
797}
798
David Sterba444e7512016-01-21 18:50:40 +0100799
800/*
801 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
802 * values in superblock. Call after any changes to incompat/compat_ro flags
803 */
804void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
805 u64 bit, enum btrfs_feature_set set)
806{
807 struct btrfs_fs_devices *fs_devs;
808 struct kobject *fsid_kobj;
809 u64 features;
810 int ret;
811
812 if (!fs_info)
813 return;
814
815 features = get_features(fs_info, set);
816 ASSERT(bit & supported_feature_masks[set]);
817
818 fs_devs = fs_info->fs_devices;
819 fsid_kobj = &fs_devs->fsid_kobj;
820
David Sterbabf609202016-01-27 14:06:29 +0100821 if (!fsid_kobj->state_initialized)
822 return;
823
David Sterba444e7512016-01-21 18:50:40 +0100824 /*
825 * FIXME: this is too heavy to update just one value, ideally we'd like
826 * to use sysfs_update_group but some refactoring is needed first.
827 */
828 sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
829 ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
830}
831
David Sterba1bae3092014-02-05 15:36:18 +0100832static int btrfs_init_debugfs(void)
833{
834#ifdef CONFIG_DEBUG_FS
835 btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
836 if (!btrfs_debugfs_root_dentry)
837 return -ENOMEM;
838
839 debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry,
840 &btrfs_debugfs_test);
841#endif
842 return 0;
843}
844
Christoph Hellwigb2141072008-09-05 16:43:31 -0400845int btrfs_init_sysfs(void)
Josef Bacik58176a92007-08-29 15:47:34 -0400846{
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400847 int ret;
David Sterba1bae3092014-02-05 15:36:18 +0100848
Greg KHe3fe4e72008-02-20 14:14:16 -0500849 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
850 if (!btrfs_kset)
851 return -ENOMEM;
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400852
David Sterba1bae3092014-02-05 15:36:18 +0100853 ret = btrfs_init_debugfs();
854 if (ret)
Filipe Manana001a6482015-01-23 18:27:00 +0000855 goto out1;
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400856
David Sterba1bae3092014-02-05 15:36:18 +0100857 init_feature_attrs();
858 ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
Filipe Manana001a6482015-01-23 18:27:00 +0000859 if (ret)
860 goto out2;
861
862 return 0;
863out2:
864 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
865out1:
866 kset_unregister(btrfs_kset);
David Sterba1bae3092014-02-05 15:36:18 +0100867
868 return ret;
Josef Bacik58176a92007-08-29 15:47:34 -0400869}
870
Christoph Hellwigb2141072008-09-05 16:43:31 -0400871void btrfs_exit_sysfs(void)
Josef Bacik58176a92007-08-29 15:47:34 -0400872{
Jeff Mahoney079b72b2013-11-01 13:06:57 -0400873 sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
Greg KHe3fe4e72008-02-20 14:14:16 -0500874 kset_unregister(btrfs_kset);
David Sterba1bae3092014-02-05 15:36:18 +0100875 debugfs_remove_recursive(btrfs_debugfs_root_dentry);
Josef Bacik58176a92007-08-29 15:47:34 -0400876}
Chris Mason55d47412008-02-20 16:02:51 -0500877