2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
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>
24 #include <linux/kobject.h>
25 #include <linux/bug.h>
26 #include <linux/genhd.h>
27 #include <linux/debugfs.h>
31 #include "transaction.h"
35 static inline struct btrfs_fs_info
*to_fs_info(struct kobject
*kobj
);
36 static inline struct btrfs_fs_devices
*to_fs_devs(struct kobject
*kobj
);
38 static u64
get_features(struct btrfs_fs_info
*fs_info
,
39 enum btrfs_feature_set set
)
41 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
);
47 return btrfs_super_incompat_flags(disk_super
);
50 static void set_features(struct btrfs_fs_info
*fs_info
,
51 enum btrfs_feature_set set
, u64 features
)
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
);
59 btrfs_set_super_incompat_flags(disk_super
, features
);
62 static int can_modify_feature(struct btrfs_feature_attr
*fa
)
66 switch (fa
->feature_set
) {
68 set
= BTRFS_FEATURE_COMPAT_SAFE_SET
;
69 clear
= BTRFS_FEATURE_COMPAT_SAFE_CLEAR
;
72 set
= BTRFS_FEATURE_COMPAT_RO_SAFE_SET
;
73 clear
= BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR
;
76 set
= BTRFS_FEATURE_INCOMPAT_SAFE_SET
;
77 clear
= BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR
;
80 pr_warn("btrfs: sysfs: unknown feature set %d\n",
85 if (set
& fa
->feature_bit
)
87 if (clear
& fa
->feature_bit
)
93 static ssize_t
btrfs_feature_attr_show(struct kobject
*kobj
,
94 struct kobj_attribute
*a
, char *buf
)
97 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
98 struct btrfs_feature_attr
*fa
= to_btrfs_feature_attr(a
);
100 u64 features
= get_features(fs_info
, fa
->feature_set
);
101 if (features
& fa
->feature_bit
)
104 val
= can_modify_feature(fa
);
106 return snprintf(buf
, PAGE_SIZE
, "%d\n", val
);
109 static ssize_t
btrfs_feature_attr_store(struct kobject
*kobj
,
110 struct kobj_attribute
*a
,
111 const char *buf
, size_t count
)
113 struct btrfs_fs_info
*fs_info
;
114 struct btrfs_feature_attr
*fa
= to_btrfs_feature_attr(a
);
115 u64 features
, set
, clear
;
119 fs_info
= to_fs_info(kobj
);
123 if (sb_rdonly(fs_info
->sb
))
126 ret
= kstrtoul(skip_spaces(buf
), 0, &val
);
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
;
137 set
= BTRFS_FEATURE_INCOMPAT_SAFE_SET
;
138 clear
= BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR
;
141 features
= get_features(fs_info
, fa
->feature_set
);
144 if ((val
&& (features
& fa
->feature_bit
)) ||
145 (!val
&& !(features
& fa
->feature_bit
)))
148 if ((val
&& !(set
& fa
->feature_bit
)) ||
149 (!val
&& !(clear
& fa
->feature_bit
))) {
151 "%sabling feature %s on mounted fs is not supported.",
152 val
? "En" : "Dis", fa
->kobj_attr
.attr
.name
);
156 btrfs_info(fs_info
, "%s %s feature flag",
157 val
? "Setting" : "Clearing", fa
->kobj_attr
.attr
.name
);
159 spin_lock(&fs_info
->super_lock
);
160 features
= get_features(fs_info
, fa
->feature_set
);
162 features
|= fa
->feature_bit
;
164 features
&= ~fa
->feature_bit
;
165 set_features(fs_info
, fa
->feature_set
, features
);
166 spin_unlock(&fs_info
->super_lock
);
169 * We don't want to do full transaction commit from inside sysfs
171 btrfs_set_pending(fs_info
, COMMIT
);
172 wake_up_process(fs_info
->transaction_kthread
);
177 static umode_t
btrfs_feature_visible(struct kobject
*kobj
,
178 struct attribute
*attr
, int unused
)
180 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
181 umode_t mode
= attr
->mode
;
184 struct btrfs_feature_attr
*fa
;
187 fa
= attr_to_btrfs_feature_attr(attr
);
188 features
= get_features(fs_info
, fa
->feature_set
);
190 if (can_modify_feature(fa
))
192 else if (!(features
& fa
->feature_bit
))
199 BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref
, MIXED_BACKREF
);
200 BTRFS_FEAT_ATTR_INCOMPAT(default_subvol
, DEFAULT_SUBVOL
);
201 BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups
, MIXED_GROUPS
);
202 BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo
, COMPRESS_LZO
);
203 BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd
, COMPRESS_ZSTD
);
204 BTRFS_FEAT_ATTR_INCOMPAT(big_metadata
, BIG_METADATA
);
205 BTRFS_FEAT_ATTR_INCOMPAT(extended_iref
, EXTENDED_IREF
);
206 BTRFS_FEAT_ATTR_INCOMPAT(raid56
, RAID56
);
207 BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata
, SKINNY_METADATA
);
208 BTRFS_FEAT_ATTR_INCOMPAT(no_holes
, NO_HOLES
);
209 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree
, FREE_SPACE_TREE
);
211 static struct attribute
*btrfs_supported_feature_attrs
[] = {
212 BTRFS_FEAT_ATTR_PTR(mixed_backref
),
213 BTRFS_FEAT_ATTR_PTR(default_subvol
),
214 BTRFS_FEAT_ATTR_PTR(mixed_groups
),
215 BTRFS_FEAT_ATTR_PTR(compress_lzo
),
216 BTRFS_FEAT_ATTR_PTR(compress_zstd
),
217 BTRFS_FEAT_ATTR_PTR(big_metadata
),
218 BTRFS_FEAT_ATTR_PTR(extended_iref
),
219 BTRFS_FEAT_ATTR_PTR(raid56
),
220 BTRFS_FEAT_ATTR_PTR(skinny_metadata
),
221 BTRFS_FEAT_ATTR_PTR(no_holes
),
222 BTRFS_FEAT_ATTR_PTR(free_space_tree
),
226 static const struct attribute_group btrfs_feature_attr_group
= {
228 .is_visible
= btrfs_feature_visible
,
229 .attrs
= btrfs_supported_feature_attrs
,
232 static ssize_t
btrfs_show_u64(u64
*value_ptr
, spinlock_t
*lock
, char *buf
)
240 return snprintf(buf
, PAGE_SIZE
, "%llu\n", val
);
243 static ssize_t
global_rsv_size_show(struct kobject
*kobj
,
244 struct kobj_attribute
*ka
, char *buf
)
246 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
->parent
);
247 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
248 return btrfs_show_u64(&block_rsv
->size
, &block_rsv
->lock
, buf
);
250 BTRFS_ATTR(global_rsv_size
, global_rsv_size_show
);
252 static ssize_t
global_rsv_reserved_show(struct kobject
*kobj
,
253 struct kobj_attribute
*a
, char *buf
)
255 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
->parent
);
256 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
257 return btrfs_show_u64(&block_rsv
->reserved
, &block_rsv
->lock
, buf
);
259 BTRFS_ATTR(global_rsv_reserved
, global_rsv_reserved_show
);
261 #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
262 #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
264 static ssize_t
raid_bytes_show(struct kobject
*kobj
,
265 struct kobj_attribute
*attr
, char *buf
);
266 BTRFS_RAID_ATTR(total_bytes
, raid_bytes_show
);
267 BTRFS_RAID_ATTR(used_bytes
, raid_bytes_show
);
269 static ssize_t
raid_bytes_show(struct kobject
*kobj
,
270 struct kobj_attribute
*attr
, char *buf
)
273 struct btrfs_space_info
*sinfo
= to_space_info(kobj
->parent
);
274 struct btrfs_block_group_cache
*block_group
;
275 int index
= to_raid_kobj(kobj
)->raid_type
;
278 down_read(&sinfo
->groups_sem
);
279 list_for_each_entry(block_group
, &sinfo
->block_groups
[index
], list
) {
280 if (&attr
->attr
== BTRFS_RAID_ATTR_PTR(total_bytes
))
281 val
+= block_group
->key
.offset
;
283 val
+= btrfs_block_group_used(&block_group
->item
);
285 up_read(&sinfo
->groups_sem
);
286 return snprintf(buf
, PAGE_SIZE
, "%llu\n", val
);
289 static struct attribute
*raid_attributes
[] = {
290 BTRFS_RAID_ATTR_PTR(total_bytes
),
291 BTRFS_RAID_ATTR_PTR(used_bytes
),
295 static void release_raid_kobj(struct kobject
*kobj
)
297 kfree(to_raid_kobj(kobj
));
300 struct kobj_type btrfs_raid_ktype
= {
301 .sysfs_ops
= &kobj_sysfs_ops
,
302 .release
= release_raid_kobj
,
303 .default_attrs
= raid_attributes
,
306 #define SPACE_INFO_ATTR(field) \
307 static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
308 struct kobj_attribute *a, \
311 struct btrfs_space_info *sinfo = to_space_info(kobj); \
312 return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
314 BTRFS_ATTR(field, btrfs_space_info_show_##field)
316 static ssize_t
btrfs_space_info_show_total_bytes_pinned(struct kobject
*kobj
,
317 struct kobj_attribute
*a
,
320 struct btrfs_space_info
*sinfo
= to_space_info(kobj
);
321 s64 val
= percpu_counter_sum(&sinfo
->total_bytes_pinned
);
322 return snprintf(buf
, PAGE_SIZE
, "%lld\n", val
);
325 SPACE_INFO_ATTR(flags
);
326 SPACE_INFO_ATTR(total_bytes
);
327 SPACE_INFO_ATTR(bytes_used
);
328 SPACE_INFO_ATTR(bytes_pinned
);
329 SPACE_INFO_ATTR(bytes_reserved
);
330 SPACE_INFO_ATTR(bytes_may_use
);
331 SPACE_INFO_ATTR(bytes_readonly
);
332 SPACE_INFO_ATTR(disk_used
);
333 SPACE_INFO_ATTR(disk_total
);
334 BTRFS_ATTR(total_bytes_pinned
, btrfs_space_info_show_total_bytes_pinned
);
336 static struct attribute
*space_info_attrs
[] = {
337 BTRFS_ATTR_PTR(flags
),
338 BTRFS_ATTR_PTR(total_bytes
),
339 BTRFS_ATTR_PTR(bytes_used
),
340 BTRFS_ATTR_PTR(bytes_pinned
),
341 BTRFS_ATTR_PTR(bytes_reserved
),
342 BTRFS_ATTR_PTR(bytes_may_use
),
343 BTRFS_ATTR_PTR(bytes_readonly
),
344 BTRFS_ATTR_PTR(disk_used
),
345 BTRFS_ATTR_PTR(disk_total
),
346 BTRFS_ATTR_PTR(total_bytes_pinned
),
350 static void space_info_release(struct kobject
*kobj
)
352 struct btrfs_space_info
*sinfo
= to_space_info(kobj
);
353 percpu_counter_destroy(&sinfo
->total_bytes_pinned
);
357 struct kobj_type space_info_ktype
= {
358 .sysfs_ops
= &kobj_sysfs_ops
,
359 .release
= space_info_release
,
360 .default_attrs
= space_info_attrs
,
363 static const struct attribute
*allocation_attrs
[] = {
364 BTRFS_ATTR_PTR(global_rsv_reserved
),
365 BTRFS_ATTR_PTR(global_rsv_size
),
369 static ssize_t
btrfs_label_show(struct kobject
*kobj
,
370 struct kobj_attribute
*a
, char *buf
)
372 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
373 char *label
= fs_info
->super_copy
->label
;
376 spin_lock(&fs_info
->super_lock
);
377 ret
= snprintf(buf
, PAGE_SIZE
, label
[0] ? "%s\n" : "%s", label
);
378 spin_unlock(&fs_info
->super_lock
);
383 static ssize_t
btrfs_label_store(struct kobject
*kobj
,
384 struct kobj_attribute
*a
,
385 const char *buf
, size_t len
)
387 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
393 if (sb_rdonly(fs_info
->sb
))
397 * p_len is the len until the first occurrence of either
400 p_len
= strcspn(buf
, "\n");
402 if (p_len
>= BTRFS_LABEL_SIZE
)
405 spin_lock(&fs_info
->super_lock
);
406 memset(fs_info
->super_copy
->label
, 0, BTRFS_LABEL_SIZE
);
407 memcpy(fs_info
->super_copy
->label
, buf
, p_len
);
408 spin_unlock(&fs_info
->super_lock
);
411 * We don't want to do full transaction commit from inside sysfs
413 btrfs_set_pending(fs_info
, COMMIT
);
414 wake_up_process(fs_info
->transaction_kthread
);
418 BTRFS_ATTR_RW(label
, btrfs_label_show
, btrfs_label_store
);
420 static ssize_t
btrfs_nodesize_show(struct kobject
*kobj
,
421 struct kobj_attribute
*a
, char *buf
)
423 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
425 return snprintf(buf
, PAGE_SIZE
, "%u\n", fs_info
->super_copy
->nodesize
);
428 BTRFS_ATTR(nodesize
, btrfs_nodesize_show
);
430 static ssize_t
btrfs_sectorsize_show(struct kobject
*kobj
,
431 struct kobj_attribute
*a
, char *buf
)
433 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
435 return snprintf(buf
, PAGE_SIZE
, "%u\n",
436 fs_info
->super_copy
->sectorsize
);
439 BTRFS_ATTR(sectorsize
, btrfs_sectorsize_show
);
441 static ssize_t
btrfs_clone_alignment_show(struct kobject
*kobj
,
442 struct kobj_attribute
*a
, char *buf
)
444 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
446 return snprintf(buf
, PAGE_SIZE
, "%u\n",
447 fs_info
->super_copy
->sectorsize
);
450 BTRFS_ATTR(clone_alignment
, btrfs_clone_alignment_show
);
452 static ssize_t
quota_override_show(struct kobject
*kobj
,
453 struct kobj_attribute
*a
, char *buf
)
455 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
458 quota_override
= test_bit(BTRFS_FS_QUOTA_OVERRIDE
, &fs_info
->flags
);
459 return snprintf(buf
, PAGE_SIZE
, "%d\n", quota_override
);
462 static ssize_t
quota_override_store(struct kobject
*kobj
,
463 struct kobj_attribute
*a
,
464 const char *buf
, size_t len
)
466 struct btrfs_fs_info
*fs_info
= to_fs_info(kobj
);
473 if (!capable(CAP_SYS_RESOURCE
))
476 err
= kstrtoul(buf
, 10, &knob
);
483 set_bit(BTRFS_FS_QUOTA_OVERRIDE
, &fs_info
->flags
);
485 clear_bit(BTRFS_FS_QUOTA_OVERRIDE
, &fs_info
->flags
);
490 BTRFS_ATTR_RW(quota_override
, quota_override_show
, quota_override_store
);
492 static const struct attribute
*btrfs_attrs
[] = {
493 BTRFS_ATTR_PTR(label
),
494 BTRFS_ATTR_PTR(nodesize
),
495 BTRFS_ATTR_PTR(sectorsize
),
496 BTRFS_ATTR_PTR(clone_alignment
),
497 BTRFS_ATTR_PTR(quota_override
),
501 static void btrfs_release_fsid_kobj(struct kobject
*kobj
)
503 struct btrfs_fs_devices
*fs_devs
= to_fs_devs(kobj
);
505 memset(&fs_devs
->fsid_kobj
, 0, sizeof(struct kobject
));
506 complete(&fs_devs
->kobj_unregister
);
509 static struct kobj_type btrfs_ktype
= {
510 .sysfs_ops
= &kobj_sysfs_ops
,
511 .release
= btrfs_release_fsid_kobj
,
514 static inline struct btrfs_fs_devices
*to_fs_devs(struct kobject
*kobj
)
516 if (kobj
->ktype
!= &btrfs_ktype
)
518 return container_of(kobj
, struct btrfs_fs_devices
, fsid_kobj
);
521 static inline struct btrfs_fs_info
*to_fs_info(struct kobject
*kobj
)
523 if (kobj
->ktype
!= &btrfs_ktype
)
525 return to_fs_devs(kobj
)->fs_info
;
528 #define NUM_FEATURE_BITS 64
529 static char btrfs_unknown_feature_names
[3][NUM_FEATURE_BITS
][13];
530 static struct btrfs_feature_attr btrfs_feature_attrs
[3][NUM_FEATURE_BITS
];
532 static const u64 supported_feature_masks
[3] = {
533 [FEAT_COMPAT
] = BTRFS_FEATURE_COMPAT_SUPP
,
534 [FEAT_COMPAT_RO
] = BTRFS_FEATURE_COMPAT_RO_SUPP
,
535 [FEAT_INCOMPAT
] = BTRFS_FEATURE_INCOMPAT_SUPP
,
538 static int addrm_unknown_feature_attrs(struct btrfs_fs_info
*fs_info
, bool add
)
542 for (set
= 0; set
< FEAT_MAX
; set
++) {
544 struct attribute
*attrs
[2];
545 struct attribute_group agroup
= {
549 u64 features
= get_features(fs_info
, set
);
550 features
&= ~supported_feature_masks
[set
];
556 for (i
= 0; i
< NUM_FEATURE_BITS
; i
++) {
557 struct btrfs_feature_attr
*fa
;
559 if (!(features
& (1ULL << i
)))
562 fa
= &btrfs_feature_attrs
[set
][i
];
563 attrs
[0] = &fa
->kobj_attr
.attr
;
566 ret
= sysfs_merge_group(&fs_info
->fs_devices
->fsid_kobj
,
571 sysfs_unmerge_group(&fs_info
->fs_devices
->fsid_kobj
,
579 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices
*fs_devs
)
581 if (fs_devs
->device_dir_kobj
) {
582 kobject_del(fs_devs
->device_dir_kobj
);
583 kobject_put(fs_devs
->device_dir_kobj
);
584 fs_devs
->device_dir_kobj
= NULL
;
587 if (fs_devs
->fsid_kobj
.state_initialized
) {
588 kobject_del(&fs_devs
->fsid_kobj
);
589 kobject_put(&fs_devs
->fsid_kobj
);
590 wait_for_completion(&fs_devs
->kobj_unregister
);
594 /* when fs_devs is NULL it will remove all fsid kobject */
595 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices
*fs_devs
)
597 struct list_head
*fs_uuids
= btrfs_get_fs_uuids();
600 __btrfs_sysfs_remove_fsid(fs_devs
);
604 list_for_each_entry(fs_devs
, fs_uuids
, list
) {
605 __btrfs_sysfs_remove_fsid(fs_devs
);
609 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info
*fs_info
)
611 btrfs_reset_fs_info_ptr(fs_info
);
613 if (fs_info
->space_info_kobj
) {
614 sysfs_remove_files(fs_info
->space_info_kobj
, allocation_attrs
);
615 kobject_del(fs_info
->space_info_kobj
);
616 kobject_put(fs_info
->space_info_kobj
);
618 addrm_unknown_feature_attrs(fs_info
, false);
619 sysfs_remove_group(&fs_info
->fs_devices
->fsid_kobj
, &btrfs_feature_attr_group
);
620 sysfs_remove_files(&fs_info
->fs_devices
->fsid_kobj
, btrfs_attrs
);
621 btrfs_sysfs_rm_device_link(fs_info
->fs_devices
, NULL
);
624 const char * const btrfs_feature_set_names
[3] = {
625 [FEAT_COMPAT
] = "compat",
626 [FEAT_COMPAT_RO
] = "compat_ro",
627 [FEAT_INCOMPAT
] = "incompat",
630 char *btrfs_printable_features(enum btrfs_feature_set set
, u64 flags
)
632 size_t bufsize
= 4096; /* safe max, 64 names * 64 bytes */
637 str
= kmalloc(bufsize
, GFP_KERNEL
);
641 for (i
= 0; i
< ARRAY_SIZE(btrfs_feature_attrs
[set
]); i
++) {
644 if (!(flags
& (1ULL << i
)))
647 name
= btrfs_feature_attrs
[set
][i
].kobj_attr
.attr
.name
;
648 len
+= snprintf(str
+ len
, bufsize
- len
, "%s%s",
649 len
? "," : "", name
);
655 static void init_feature_attrs(void)
657 struct btrfs_feature_attr
*fa
;
660 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names
) !=
661 ARRAY_SIZE(btrfs_feature_attrs
));
662 BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names
[0]) !=
663 ARRAY_SIZE(btrfs_feature_attrs
[0]));
665 memset(btrfs_feature_attrs
, 0, sizeof(btrfs_feature_attrs
));
666 memset(btrfs_unknown_feature_names
, 0,
667 sizeof(btrfs_unknown_feature_names
));
669 for (i
= 0; btrfs_supported_feature_attrs
[i
]; i
++) {
670 struct btrfs_feature_attr
*sfa
;
671 struct attribute
*a
= btrfs_supported_feature_attrs
[i
];
673 sfa
= attr_to_btrfs_feature_attr(a
);
674 bit
= ilog2(sfa
->feature_bit
);
675 fa
= &btrfs_feature_attrs
[sfa
->feature_set
][bit
];
677 fa
->kobj_attr
.attr
.name
= sfa
->kobj_attr
.attr
.name
;
680 for (set
= 0; set
< FEAT_MAX
; set
++) {
681 for (i
= 0; i
< ARRAY_SIZE(btrfs_feature_attrs
[set
]); i
++) {
682 char *name
= btrfs_unknown_feature_names
[set
][i
];
683 fa
= &btrfs_feature_attrs
[set
][i
];
685 if (fa
->kobj_attr
.attr
.name
)
688 snprintf(name
, 13, "%s:%u",
689 btrfs_feature_set_names
[set
], i
);
691 fa
->kobj_attr
.attr
.name
= name
;
692 fa
->kobj_attr
.attr
.mode
= S_IRUGO
;
693 fa
->feature_set
= set
;
694 fa
->feature_bit
= 1ULL << i
;
699 /* when one_device is NULL, it removes all device links */
701 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices
*fs_devices
,
702 struct btrfs_device
*one_device
)
704 struct hd_struct
*disk
;
705 struct kobject
*disk_kobj
;
707 if (!fs_devices
->device_dir_kobj
)
710 if (one_device
&& one_device
->bdev
) {
711 disk
= one_device
->bdev
->bd_part
;
712 disk_kobj
= &part_to_dev(disk
)->kobj
;
714 sysfs_remove_link(fs_devices
->device_dir_kobj
,
721 list_for_each_entry(one_device
,
722 &fs_devices
->devices
, dev_list
) {
723 if (!one_device
->bdev
)
725 disk
= one_device
->bdev
->bd_part
;
726 disk_kobj
= &part_to_dev(disk
)->kobj
;
728 sysfs_remove_link(fs_devices
->device_dir_kobj
,
735 int btrfs_sysfs_add_device(struct btrfs_fs_devices
*fs_devs
)
737 if (!fs_devs
->device_dir_kobj
)
738 fs_devs
->device_dir_kobj
= kobject_create_and_add("devices",
739 &fs_devs
->fsid_kobj
);
741 if (!fs_devs
->device_dir_kobj
)
747 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices
*fs_devices
,
748 struct btrfs_device
*one_device
)
751 struct btrfs_device
*dev
;
753 list_for_each_entry(dev
, &fs_devices
->devices
, dev_list
) {
754 struct hd_struct
*disk
;
755 struct kobject
*disk_kobj
;
760 if (one_device
&& one_device
!= dev
)
763 disk
= dev
->bdev
->bd_part
;
764 disk_kobj
= &part_to_dev(disk
)->kobj
;
766 error
= sysfs_create_link(fs_devices
->device_dir_kobj
,
767 disk_kobj
, disk_kobj
->name
);
775 /* /sys/fs/btrfs/ entry */
776 static struct kset
*btrfs_kset
;
778 /* /sys/kernel/debug/btrfs */
779 static struct dentry
*btrfs_debugfs_root_dentry
;
781 /* Debugging tunables and exported data */
782 u64 btrfs_debugfs_test
;
785 * Can be called by the device discovery thread.
786 * And parent can be specified for seed device
788 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices
*fs_devs
,
789 struct kobject
*parent
)
793 init_completion(&fs_devs
->kobj_unregister
);
794 fs_devs
->fsid_kobj
.kset
= btrfs_kset
;
795 error
= kobject_init_and_add(&fs_devs
->fsid_kobj
,
796 &btrfs_ktype
, parent
, "%pU", fs_devs
->fsid
);
800 int btrfs_sysfs_add_mounted(struct btrfs_fs_info
*fs_info
)
803 struct btrfs_fs_devices
*fs_devs
= fs_info
->fs_devices
;
804 struct kobject
*fsid_kobj
= &fs_devs
->fsid_kobj
;
806 btrfs_set_fs_info_ptr(fs_info
);
808 error
= btrfs_sysfs_add_device_link(fs_devs
, NULL
);
812 error
= sysfs_create_files(fsid_kobj
, btrfs_attrs
);
814 btrfs_sysfs_rm_device_link(fs_devs
, NULL
);
818 error
= sysfs_create_group(fsid_kobj
,
819 &btrfs_feature_attr_group
);
823 error
= addrm_unknown_feature_attrs(fs_info
, true);
827 fs_info
->space_info_kobj
= kobject_create_and_add("allocation",
829 if (!fs_info
->space_info_kobj
) {
834 error
= sysfs_create_files(fs_info
->space_info_kobj
, allocation_attrs
);
840 btrfs_sysfs_remove_mounted(fs_info
);
846 * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
847 * values in superblock. Call after any changes to incompat/compat_ro flags
849 void btrfs_sysfs_feature_update(struct btrfs_fs_info
*fs_info
,
850 u64 bit
, enum btrfs_feature_set set
)
852 struct btrfs_fs_devices
*fs_devs
;
853 struct kobject
*fsid_kobj
;
860 features
= get_features(fs_info
, set
);
861 ASSERT(bit
& supported_feature_masks
[set
]);
863 fs_devs
= fs_info
->fs_devices
;
864 fsid_kobj
= &fs_devs
->fsid_kobj
;
866 if (!fsid_kobj
->state_initialized
)
870 * FIXME: this is too heavy to update just one value, ideally we'd like
871 * to use sysfs_update_group but some refactoring is needed first.
873 sysfs_remove_group(fsid_kobj
, &btrfs_feature_attr_group
);
874 ret
= sysfs_create_group(fsid_kobj
, &btrfs_feature_attr_group
);
877 static int btrfs_init_debugfs(void)
879 #ifdef CONFIG_DEBUG_FS
880 btrfs_debugfs_root_dentry
= debugfs_create_dir("btrfs", NULL
);
881 if (!btrfs_debugfs_root_dentry
)
885 * Example code, how to export data through debugfs.
887 * file: /sys/kernel/debug/btrfs/test
888 * contents of: btrfs_debugfs_test
890 #ifdef CONFIG_BTRFS_DEBUG
891 debugfs_create_u64("test", S_IRUGO
| S_IWUSR
, btrfs_debugfs_root_dentry
,
892 &btrfs_debugfs_test
);
899 int btrfs_init_sysfs(void)
903 btrfs_kset
= kset_create_and_add("btrfs", NULL
, fs_kobj
);
907 ret
= btrfs_init_debugfs();
911 init_feature_attrs();
912 ret
= sysfs_create_group(&btrfs_kset
->kobj
, &btrfs_feature_attr_group
);
918 debugfs_remove_recursive(btrfs_debugfs_root_dentry
);
920 kset_unregister(btrfs_kset
);
925 void btrfs_exit_sysfs(void)
927 sysfs_remove_group(&btrfs_kset
->kobj
, &btrfs_feature_attr_group
);
928 kset_unregister(btrfs_kset
);
929 debugfs_remove_recursive(btrfs_debugfs_root_dentry
);