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c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6cbd5570 CM |
2 | /* |
3 | * Copyright (C) 2007 Oracle. All rights reserved. | |
6cbd5570 CM |
4 | */ |
5 | ||
58176a96 | 6 | #include <linux/sched.h> |
32a9991f | 7 | #include <linux/sched/mm.h> |
58176a96 JB |
8 | #include <linux/slab.h> |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/completion.h> | |
79da4fa4 | 11 | #include <linux/bug.h> |
fcd9531b | 12 | #include <linux/list.h> |
41e6d2a8 | 13 | #include <crypto/hash.h> |
9b569ea0 | 14 | #include "messages.h" |
bae45de0 | 15 | #include "ctree.h" |
dfb79ddb | 16 | #include "discard.h" |
bae45de0 | 17 | #include "disk-io.h" |
7573df55 | 18 | #include "send.h" |
bae45de0 | 19 | #include "transaction.h" |
079b72bc | 20 | #include "sysfs.h" |
29e5be24 | 21 | #include "volumes.h" |
8719aaae | 22 | #include "space-info.h" |
aac0023c | 23 | #include "block-group.h" |
49e5fb46 | 24 | #include "qgroup.h" |
19fc516a | 25 | #include "misc.h" |
ec8eb376 | 26 | #include "fs.h" |
07e81dc9 | 27 | #include "accessors.h" |
079b72bc | 28 | |
e7849e33 AJ |
29 | /* |
30 | * Structure name Path | |
31 | * -------------------------------------------------------------------------- | |
32 | * btrfs_supported_static_feature_attrs /sys/fs/btrfs/features | |
33 | * btrfs_supported_feature_attrs /sys/fs/btrfs/features and | |
34 | * /sys/fs/btrfs/<uuid>/features | |
35 | * btrfs_attrs /sys/fs/btrfs/<uuid> | |
36 | * devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid> | |
37 | * allocation_attrs /sys/fs/btrfs/<uuid>/allocation | |
38 | * qgroup_attrs /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid> | |
39 | * space_info_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type> | |
40 | * raid_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile> | |
fb731430 | 41 | * discard_attrs /sys/fs/btrfs/<uuid>/discard |
e7849e33 AJ |
42 | * |
43 | * When built with BTRFS_CONFIG_DEBUG: | |
44 | * | |
45 | * btrfs_debug_feature_attrs /sys/fs/btrfs/debug | |
46 | * btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug | |
e7849e33 AJ |
47 | */ |
48 | ||
9188db61 DS |
49 | struct btrfs_feature_attr { |
50 | struct kobj_attribute kobj_attr; | |
51 | enum btrfs_feature_set feature_set; | |
52 | u64 feature_bit; | |
53 | }; | |
54 | ||
55 | /* For raid type sysfs entries */ | |
56 | struct raid_kobject { | |
57 | u64 flags; | |
58 | struct kobject kobj; | |
59 | }; | |
60 | ||
61 | #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \ | |
62 | { \ | |
63 | .attr = { .name = __stringify(_name), .mode = _mode }, \ | |
64 | .show = _show, \ | |
65 | .store = _store, \ | |
66 | } | |
67 | ||
22c55e3b SR |
68 | #define BTRFS_ATTR_W(_prefix, _name, _store) \ |
69 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
70 | __INIT_KOBJ_ATTR(_name, 0200, NULL, _store) | |
71 | ||
9188db61 DS |
72 | #define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \ |
73 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
74 | __INIT_KOBJ_ATTR(_name, 0644, _show, _store) | |
75 | ||
76 | #define BTRFS_ATTR(_prefix, _name, _show) \ | |
77 | static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \ | |
78 | __INIT_KOBJ_ATTR(_name, 0444, _show, NULL) | |
79 | ||
80 | #define BTRFS_ATTR_PTR(_prefix, _name) \ | |
81 | (&btrfs_attr_##_prefix##_##_name.attr) | |
82 | ||
83 | #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \ | |
84 | static struct btrfs_feature_attr btrfs_attr_features_##_name = { \ | |
85 | .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \ | |
86 | btrfs_feature_attr_show, \ | |
87 | btrfs_feature_attr_store), \ | |
88 | .feature_set = _feature_set, \ | |
89 | .feature_bit = _feature_prefix ##_## _feature_bit, \ | |
90 | } | |
91 | #define BTRFS_FEAT_ATTR_PTR(_name) \ | |
92 | (&btrfs_attr_features_##_name.kobj_attr.attr) | |
93 | ||
94 | #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \ | |
95 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature) | |
96 | #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \ | |
97 | BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature) | |
98 | #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \ | |
99 | BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature) | |
100 | ||
510d7360 | 101 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); |
2e7910d6 | 102 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj); |
19fc516a | 103 | static struct kobject *get_btrfs_kobj(struct kobject *kobj); |
5ac1d209 | 104 | |
8f52316c DS |
105 | static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a) |
106 | { | |
107 | return container_of(a, struct btrfs_feature_attr, kobj_attr); | |
108 | } | |
109 | ||
110 | static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr) | |
111 | { | |
112 | return container_of(attr, struct kobj_attribute, attr); | |
113 | } | |
114 | ||
115 | static struct btrfs_feature_attr *attr_to_btrfs_feature_attr( | |
116 | struct attribute *attr) | |
117 | { | |
118 | return to_btrfs_feature_attr(attr_to_btrfs_attr(attr)); | |
119 | } | |
120 | ||
510d7360 JM |
121 | static u64 get_features(struct btrfs_fs_info *fs_info, |
122 | enum btrfs_feature_set set) | |
5ac1d209 | 123 | { |
510d7360 JM |
124 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
125 | if (set == FEAT_COMPAT) | |
126 | return btrfs_super_compat_flags(disk_super); | |
127 | else if (set == FEAT_COMPAT_RO) | |
128 | return btrfs_super_compat_ro_flags(disk_super); | |
129 | else | |
130 | return btrfs_super_incompat_flags(disk_super); | |
5ac1d209 JM |
131 | } |
132 | ||
ba631941 JM |
133 | static void set_features(struct btrfs_fs_info *fs_info, |
134 | enum btrfs_feature_set set, u64 features) | |
135 | { | |
136 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
137 | if (set == FEAT_COMPAT) | |
138 | btrfs_set_super_compat_flags(disk_super, features); | |
139 | else if (set == FEAT_COMPAT_RO) | |
140 | btrfs_set_super_compat_ro_flags(disk_super, features); | |
141 | else | |
142 | btrfs_set_super_incompat_flags(disk_super, features); | |
143 | } | |
144 | ||
145 | static int can_modify_feature(struct btrfs_feature_attr *fa) | |
146 | { | |
147 | int val = 0; | |
148 | u64 set, clear; | |
149 | switch (fa->feature_set) { | |
150 | case FEAT_COMPAT: | |
151 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
152 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
153 | break; | |
154 | case FEAT_COMPAT_RO: | |
155 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
156 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
157 | break; | |
158 | case FEAT_INCOMPAT: | |
159 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
160 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
161 | break; | |
162 | default: | |
62e85577 | 163 | pr_warn("btrfs: sysfs: unknown feature set %d\n", |
cc37bb04 DS |
164 | fa->feature_set); |
165 | return 0; | |
ba631941 JM |
166 | } |
167 | ||
168 | if (set & fa->feature_bit) | |
169 | val |= 1; | |
170 | if (clear & fa->feature_bit) | |
171 | val |= 2; | |
172 | ||
173 | return val; | |
174 | } | |
175 | ||
510d7360 JM |
176 | static ssize_t btrfs_feature_attr_show(struct kobject *kobj, |
177 | struct kobj_attribute *a, char *buf) | |
5ac1d209 | 178 | { |
510d7360 | 179 | int val = 0; |
5ac1d209 | 180 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
ba631941 | 181 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); |
510d7360 | 182 | if (fs_info) { |
510d7360 JM |
183 | u64 features = get_features(fs_info, fa->feature_set); |
184 | if (features & fa->feature_bit) | |
185 | val = 1; | |
ba631941 JM |
186 | } else |
187 | val = can_modify_feature(fa); | |
510d7360 | 188 | |
020e5277 | 189 | return sysfs_emit(buf, "%d\n", val); |
5ac1d209 JM |
190 | } |
191 | ||
ba631941 JM |
192 | static ssize_t btrfs_feature_attr_store(struct kobject *kobj, |
193 | struct kobj_attribute *a, | |
194 | const char *buf, size_t count) | |
195 | { | |
196 | struct btrfs_fs_info *fs_info; | |
197 | struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); | |
ba631941 JM |
198 | u64 features, set, clear; |
199 | unsigned long val; | |
200 | int ret; | |
201 | ||
202 | fs_info = to_fs_info(kobj); | |
203 | if (!fs_info) | |
204 | return -EPERM; | |
205 | ||
bc98a42c | 206 | if (sb_rdonly(fs_info->sb)) |
ee611138 DS |
207 | return -EROFS; |
208 | ||
ba631941 JM |
209 | ret = kstrtoul(skip_spaces(buf), 0, &val); |
210 | if (ret) | |
211 | return ret; | |
212 | ||
213 | if (fa->feature_set == FEAT_COMPAT) { | |
214 | set = BTRFS_FEATURE_COMPAT_SAFE_SET; | |
215 | clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; | |
216 | } else if (fa->feature_set == FEAT_COMPAT_RO) { | |
217 | set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; | |
218 | clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; | |
219 | } else { | |
220 | set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; | |
221 | clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; | |
222 | } | |
223 | ||
224 | features = get_features(fs_info, fa->feature_set); | |
225 | ||
226 | /* Nothing to do */ | |
227 | if ((val && (features & fa->feature_bit)) || | |
228 | (!val && !(features & fa->feature_bit))) | |
229 | return count; | |
230 | ||
231 | if ((val && !(set & fa->feature_bit)) || | |
232 | (!val && !(clear & fa->feature_bit))) { | |
233 | btrfs_info(fs_info, | |
234 | "%sabling feature %s on mounted fs is not supported.", | |
235 | val ? "En" : "Dis", fa->kobj_attr.attr.name); | |
236 | return -EPERM; | |
237 | } | |
238 | ||
239 | btrfs_info(fs_info, "%s %s feature flag", | |
240 | val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); | |
241 | ||
ba631941 JM |
242 | spin_lock(&fs_info->super_lock); |
243 | features = get_features(fs_info, fa->feature_set); | |
244 | if (val) | |
245 | features |= fa->feature_bit; | |
246 | else | |
247 | features &= ~fa->feature_bit; | |
248 | set_features(fs_info, fa->feature_set, features); | |
249 | spin_unlock(&fs_info->super_lock); | |
250 | ||
0eae2747 DS |
251 | /* |
252 | * We don't want to do full transaction commit from inside sysfs | |
253 | */ | |
c52cc7b7 | 254 | set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); |
0eae2747 | 255 | wake_up_process(fs_info->transaction_kthread); |
ba631941 JM |
256 | |
257 | return count; | |
258 | } | |
259 | ||
510d7360 JM |
260 | static umode_t btrfs_feature_visible(struct kobject *kobj, |
261 | struct attribute *attr, int unused) | |
079b72bc | 262 | { |
510d7360 JM |
263 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); |
264 | umode_t mode = attr->mode; | |
265 | ||
266 | if (fs_info) { | |
267 | struct btrfs_feature_attr *fa; | |
268 | u64 features; | |
269 | ||
270 | fa = attr_to_btrfs_feature_attr(attr); | |
271 | features = get_features(fs_info, fa->feature_set); | |
272 | ||
ba631941 JM |
273 | if (can_modify_feature(fa)) |
274 | mode |= S_IWUSR; | |
275 | else if (!(features & fa->feature_bit)) | |
510d7360 JM |
276 | mode = 0; |
277 | } | |
278 | ||
279 | return mode; | |
079b72bc JM |
280 | } |
281 | ||
079b72bc JM |
282 | BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); |
283 | BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); | |
284 | BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); | |
5c1aab1d | 285 | BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD); |
079b72bc JM |
286 | BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); |
287 | BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); | |
288 | BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); | |
c736c095 | 289 | BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); |
56f20f40 | 290 | BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID); |
3b5bb73b | 291 | BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); |
1c56ab99 | 292 | BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE); |
cfbb825c | 293 | BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); |
a744986a | 294 | BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA); |
15dcccdb | 295 | #ifdef CONFIG_BLK_DEV_ZONED |
7b3d5a90 | 296 | BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); |
15dcccdb DS |
297 | #endif |
298 | #ifdef CONFIG_BTRFS_DEBUG | |
2c7d2a23 JB |
299 | /* Remove once support for extent tree v2 is feature complete */ |
300 | BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2); | |
9f9918a8 JT |
301 | /* Remove once support for raid stripe tree is feature complete. */ |
302 | BTRFS_FEAT_ATTR_INCOMPAT(raid_stripe_tree, RAID_STRIPE_TREE); | |
7b3d5a90 | 303 | #endif |
14605409 BB |
304 | #ifdef CONFIG_FS_VERITY |
305 | BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY); | |
306 | #endif | |
079b72bc | 307 | |
e7849e33 AJ |
308 | /* |
309 | * Features which depend on feature bits and may differ between each fs. | |
310 | * | |
143823cf | 311 | * /sys/fs/btrfs/features - all available features implemented by this version |
e7849e33 AJ |
312 | * /sys/fs/btrfs/UUID/features - features of the fs which are enabled or |
313 | * can be changed on a mounted filesystem. | |
314 | */ | |
079b72bc | 315 | static struct attribute *btrfs_supported_feature_attrs[] = { |
079b72bc JM |
316 | BTRFS_FEAT_ATTR_PTR(default_subvol), |
317 | BTRFS_FEAT_ATTR_PTR(mixed_groups), | |
318 | BTRFS_FEAT_ATTR_PTR(compress_lzo), | |
5c1aab1d | 319 | BTRFS_FEAT_ATTR_PTR(compress_zstd), |
079b72bc JM |
320 | BTRFS_FEAT_ATTR_PTR(extended_iref), |
321 | BTRFS_FEAT_ATTR_PTR(raid56), | |
322 | BTRFS_FEAT_ATTR_PTR(skinny_metadata), | |
c736c095 | 323 | BTRFS_FEAT_ATTR_PTR(no_holes), |
56f20f40 | 324 | BTRFS_FEAT_ATTR_PTR(metadata_uuid), |
3b5bb73b | 325 | BTRFS_FEAT_ATTR_PTR(free_space_tree), |
cfbb825c | 326 | BTRFS_FEAT_ATTR_PTR(raid1c34), |
1c56ab99 | 327 | BTRFS_FEAT_ATTR_PTR(block_group_tree), |
a744986a | 328 | BTRFS_FEAT_ATTR_PTR(simple_quota), |
15dcccdb | 329 | #ifdef CONFIG_BLK_DEV_ZONED |
7b3d5a90 | 330 | BTRFS_FEAT_ATTR_PTR(zoned), |
15dcccdb DS |
331 | #endif |
332 | #ifdef CONFIG_BTRFS_DEBUG | |
2c7d2a23 | 333 | BTRFS_FEAT_ATTR_PTR(extent_tree_v2), |
9f9918a8 | 334 | BTRFS_FEAT_ATTR_PTR(raid_stripe_tree), |
14605409 BB |
335 | #endif |
336 | #ifdef CONFIG_FS_VERITY | |
337 | BTRFS_FEAT_ATTR_PTR(verity), | |
7b3d5a90 | 338 | #endif |
079b72bc JM |
339 | NULL |
340 | }; | |
341 | ||
342 | static const struct attribute_group btrfs_feature_attr_group = { | |
343 | .name = "features", | |
510d7360 | 344 | .is_visible = btrfs_feature_visible, |
079b72bc JM |
345 | .attrs = btrfs_supported_feature_attrs, |
346 | }; | |
58176a96 | 347 | |
f902bd3a MT |
348 | static ssize_t rmdir_subvol_show(struct kobject *kobj, |
349 | struct kobj_attribute *ka, char *buf) | |
350 | { | |
020e5277 | 351 | return sysfs_emit(buf, "0\n"); |
f902bd3a MT |
352 | } |
353 | BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show); | |
354 | ||
f7cea56c DS |
355 | static ssize_t supported_checksums_show(struct kobject *kobj, |
356 | struct kobj_attribute *a, char *buf) | |
357 | { | |
358 | ssize_t ret = 0; | |
359 | int i; | |
360 | ||
361 | for (i = 0; i < btrfs_get_num_csums(); i++) { | |
362 | /* | |
363 | * This "trick" only works as long as 'enum btrfs_csum_type' has | |
364 | * no holes in it | |
365 | */ | |
020e5277 AJ |
366 | ret += sysfs_emit_at(buf, ret, "%s%s", (i == 0 ? "" : " "), |
367 | btrfs_super_csum_name(i)); | |
f7cea56c DS |
368 | |
369 | } | |
370 | ||
020e5277 | 371 | ret += sysfs_emit_at(buf, ret, "\n"); |
f7cea56c DS |
372 | return ret; |
373 | } | |
374 | BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show); | |
375 | ||
7573df55 OS |
376 | static ssize_t send_stream_version_show(struct kobject *kobj, |
377 | struct kobj_attribute *ka, char *buf) | |
378 | { | |
020e5277 | 379 | return sysfs_emit(buf, "%d\n", BTRFS_SEND_STREAM_VERSION); |
7573df55 OS |
380 | } |
381 | BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show); | |
382 | ||
ceafe3cc JB |
383 | static const char *rescue_opts[] = { |
384 | "usebackuproot", | |
385 | "nologreplay", | |
42437a63 | 386 | "ignorebadroots", |
882dbe0c | 387 | "ignoredatacsums", |
9037d3cb | 388 | "all", |
ceafe3cc JB |
389 | }; |
390 | ||
391 | static ssize_t supported_rescue_options_show(struct kobject *kobj, | |
392 | struct kobj_attribute *a, | |
393 | char *buf) | |
394 | { | |
395 | ssize_t ret = 0; | |
396 | int i; | |
397 | ||
398 | for (i = 0; i < ARRAY_SIZE(rescue_opts); i++) | |
020e5277 AJ |
399 | ret += sysfs_emit_at(buf, ret, "%s%s", (i ? " " : ""), rescue_opts[i]); |
400 | ret += sysfs_emit_at(buf, ret, "\n"); | |
ceafe3cc JB |
401 | return ret; |
402 | } | |
403 | BTRFS_ATTR(static_feature, supported_rescue_options, | |
404 | supported_rescue_options_show); | |
405 | ||
fc57ad8d QW |
406 | static ssize_t supported_sectorsizes_show(struct kobject *kobj, |
407 | struct kobj_attribute *a, | |
408 | char *buf) | |
409 | { | |
410 | ssize_t ret = 0; | |
411 | ||
1a42daab QW |
412 | /* An artificial limit to only support 4K and PAGE_SIZE */ |
413 | if (PAGE_SIZE > SZ_4K) | |
020e5277 | 414 | ret += sysfs_emit_at(buf, ret, "%u ", SZ_4K); |
020e5277 | 415 | ret += sysfs_emit_at(buf, ret, "%lu\n", PAGE_SIZE); |
fc57ad8d QW |
416 | |
417 | return ret; | |
418 | } | |
419 | BTRFS_ATTR(static_feature, supported_sectorsizes, | |
420 | supported_sectorsizes_show); | |
421 | ||
070bb001 AJ |
422 | static ssize_t acl_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) |
423 | { | |
424 | return sysfs_emit(buf, "%d\n", !!IS_ENABLED(CONFIG_BTRFS_FS_POSIX_ACL)); | |
425 | } | |
426 | BTRFS_ATTR(static_feature, acl, acl_show); | |
427 | ||
e7849e33 AJ |
428 | /* |
429 | * Features which only depend on kernel version. | |
430 | * | |
431 | * These are listed in /sys/fs/btrfs/features along with | |
432 | * btrfs_supported_feature_attrs. | |
433 | */ | |
f902bd3a | 434 | static struct attribute *btrfs_supported_static_feature_attrs[] = { |
070bb001 | 435 | BTRFS_ATTR_PTR(static_feature, acl), |
f902bd3a | 436 | BTRFS_ATTR_PTR(static_feature, rmdir_subvol), |
f7cea56c | 437 | BTRFS_ATTR_PTR(static_feature, supported_checksums), |
7573df55 | 438 | BTRFS_ATTR_PTR(static_feature, send_stream_version), |
ceafe3cc | 439 | BTRFS_ATTR_PTR(static_feature, supported_rescue_options), |
fc57ad8d | 440 | BTRFS_ATTR_PTR(static_feature, supported_sectorsizes), |
f902bd3a MT |
441 | NULL |
442 | }; | |
443 | ||
f902bd3a MT |
444 | static const struct attribute_group btrfs_static_feature_attr_group = { |
445 | .name = "features", | |
446 | .attrs = btrfs_supported_static_feature_attrs, | |
447 | }; | |
448 | ||
e4faab84 DZ |
449 | /* |
450 | * Discard statistics and tunables | |
451 | */ | |
fb731430 | 452 | #define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj)) |
dfb79ddb | 453 | |
5dc7c10b DZ |
454 | static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, |
455 | struct kobj_attribute *a, | |
456 | char *buf) | |
457 | { | |
458 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
459 | ||
020e5277 | 460 | return sysfs_emit(buf, "%lld\n", |
5dc7c10b DZ |
461 | atomic64_read(&fs_info->discard_ctl.discardable_bytes)); |
462 | } | |
463 | BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); | |
464 | ||
dfb79ddb DZ |
465 | static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, |
466 | struct kobj_attribute *a, | |
467 | char *buf) | |
468 | { | |
469 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
470 | ||
020e5277 | 471 | return sysfs_emit(buf, "%d\n", |
dfb79ddb DZ |
472 | atomic_read(&fs_info->discard_ctl.discardable_extents)); |
473 | } | |
474 | BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); | |
475 | ||
9ddf648f DZ |
476 | static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj, |
477 | struct kobj_attribute *a, | |
478 | char *buf) | |
479 | { | |
480 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
481 | ||
020e5277 AJ |
482 | return sysfs_emit(buf, "%llu\n", |
483 | fs_info->discard_ctl.discard_bitmap_bytes); | |
9ddf648f DZ |
484 | } |
485 | BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show); | |
486 | ||
487 | static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj, | |
488 | struct kobj_attribute *a, | |
489 | char *buf) | |
490 | { | |
491 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
492 | ||
020e5277 | 493 | return sysfs_emit(buf, "%lld\n", |
9ddf648f DZ |
494 | atomic64_read(&fs_info->discard_ctl.discard_bytes_saved)); |
495 | } | |
496 | BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show); | |
497 | ||
498 | static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj, | |
499 | struct kobj_attribute *a, | |
500 | char *buf) | |
501 | { | |
502 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
503 | ||
020e5277 AJ |
504 | return sysfs_emit(buf, "%llu\n", |
505 | fs_info->discard_ctl.discard_extent_bytes); | |
9ddf648f DZ |
506 | } |
507 | BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show); | |
508 | ||
a2309300 DZ |
509 | static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj, |
510 | struct kobj_attribute *a, | |
511 | char *buf) | |
512 | { | |
513 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
514 | ||
020e5277 AJ |
515 | return sysfs_emit(buf, "%u\n", |
516 | READ_ONCE(fs_info->discard_ctl.iops_limit)); | |
a2309300 DZ |
517 | } |
518 | ||
519 | static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj, | |
520 | struct kobj_attribute *a, | |
521 | const char *buf, size_t len) | |
522 | { | |
523 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
524 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; | |
525 | u32 iops_limit; | |
526 | int ret; | |
527 | ||
528 | ret = kstrtou32(buf, 10, &iops_limit); | |
529 | if (ret) | |
530 | return -EINVAL; | |
531 | ||
532 | WRITE_ONCE(discard_ctl->iops_limit, iops_limit); | |
3e48d8d2 PB |
533 | btrfs_discard_calc_delay(discard_ctl); |
534 | btrfs_discard_schedule_work(discard_ctl, true); | |
a2309300 DZ |
535 | return len; |
536 | } | |
537 | BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show, | |
538 | btrfs_discard_iops_limit_store); | |
539 | ||
e93591bb DZ |
540 | static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj, |
541 | struct kobj_attribute *a, | |
542 | char *buf) | |
543 | { | |
544 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
545 | ||
020e5277 AJ |
546 | return sysfs_emit(buf, "%u\n", |
547 | READ_ONCE(fs_info->discard_ctl.kbps_limit)); | |
e93591bb DZ |
548 | } |
549 | ||
550 | static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj, | |
551 | struct kobj_attribute *a, | |
552 | const char *buf, size_t len) | |
553 | { | |
554 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
555 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; | |
556 | u32 kbps_limit; | |
557 | int ret; | |
558 | ||
559 | ret = kstrtou32(buf, 10, &kbps_limit); | |
560 | if (ret) | |
561 | return -EINVAL; | |
562 | ||
563 | WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit); | |
3e48d8d2 | 564 | btrfs_discard_schedule_work(discard_ctl, true); |
e93591bb DZ |
565 | return len; |
566 | } | |
567 | BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show, | |
568 | btrfs_discard_kbps_limit_store); | |
569 | ||
19b2a2c7 DZ |
570 | static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj, |
571 | struct kobj_attribute *a, | |
572 | char *buf) | |
573 | { | |
574 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
575 | ||
020e5277 AJ |
576 | return sysfs_emit(buf, "%llu\n", |
577 | READ_ONCE(fs_info->discard_ctl.max_discard_size)); | |
19b2a2c7 DZ |
578 | } |
579 | ||
580 | static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj, | |
581 | struct kobj_attribute *a, | |
582 | const char *buf, size_t len) | |
583 | { | |
584 | struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); | |
585 | struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl; | |
586 | u64 max_discard_size; | |
587 | int ret; | |
588 | ||
589 | ret = kstrtou64(buf, 10, &max_discard_size); | |
590 | if (ret) | |
591 | return -EINVAL; | |
592 | ||
593 | WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size); | |
594 | ||
595 | return len; | |
596 | } | |
597 | BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show, | |
598 | btrfs_discard_max_discard_size_store); | |
599 | ||
e7849e33 | 600 | /* |
fb731430 | 601 | * Per-filesystem stats for discard (when mounted with discard=async). |
e7849e33 | 602 | * |
fb731430 | 603 | * Path: /sys/fs/btrfs/<uuid>/discard/ |
e7849e33 | 604 | */ |
fb731430 | 605 | static const struct attribute *discard_attrs[] = { |
5dc7c10b | 606 | BTRFS_ATTR_PTR(discard, discardable_bytes), |
dfb79ddb | 607 | BTRFS_ATTR_PTR(discard, discardable_extents), |
9ddf648f DZ |
608 | BTRFS_ATTR_PTR(discard, discard_bitmap_bytes), |
609 | BTRFS_ATTR_PTR(discard, discard_bytes_saved), | |
610 | BTRFS_ATTR_PTR(discard, discard_extent_bytes), | |
a2309300 | 611 | BTRFS_ATTR_PTR(discard, iops_limit), |
e93591bb | 612 | BTRFS_ATTR_PTR(discard, kbps_limit), |
19b2a2c7 | 613 | BTRFS_ATTR_PTR(discard, max_discard_size), |
e4faab84 DZ |
614 | NULL, |
615 | }; | |
616 | ||
fb731430 DS |
617 | #ifdef CONFIG_BTRFS_DEBUG |
618 | ||
6e369feb | 619 | /* |
e7849e33 | 620 | * Per-filesystem runtime debugging exported via sysfs. |
6e369feb | 621 | * |
e7849e33 | 622 | * Path: /sys/fs/btrfs/UUID/debug/ |
6e369feb | 623 | */ |
93945cb4 DZ |
624 | static const struct attribute *btrfs_debug_mount_attrs[] = { |
625 | NULL, | |
626 | }; | |
627 | ||
e7849e33 AJ |
628 | /* |
629 | * Runtime debugging exported via sysfs, applies to all mounted filesystems. | |
630 | * | |
631 | * Path: /sys/fs/btrfs/debug | |
632 | */ | |
6e369feb DS |
633 | static struct attribute *btrfs_debug_feature_attrs[] = { |
634 | NULL | |
635 | }; | |
636 | ||
637 | static const struct attribute_group btrfs_debug_feature_attr_group = { | |
638 | .name = "debug", | |
639 | .attrs = btrfs_debug_feature_attrs, | |
640 | }; | |
641 | ||
642 | #endif | |
643 | ||
6ab0a202 JM |
644 | static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) |
645 | { | |
646 | u64 val; | |
647 | if (lock) | |
648 | spin_lock(lock); | |
649 | val = *value_ptr; | |
650 | if (lock) | |
651 | spin_unlock(lock); | |
020e5277 | 652 | return sysfs_emit(buf, "%llu\n", val); |
6ab0a202 JM |
653 | } |
654 | ||
655 | static ssize_t global_rsv_size_show(struct kobject *kobj, | |
656 | struct kobj_attribute *ka, char *buf) | |
657 | { | |
658 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
659 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
660 | return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); | |
661 | } | |
a969f4cc | 662 | BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show); |
6ab0a202 JM |
663 | |
664 | static ssize_t global_rsv_reserved_show(struct kobject *kobj, | |
665 | struct kobj_attribute *a, char *buf) | |
666 | { | |
667 | struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); | |
668 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; | |
669 | return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); | |
670 | } | |
a969f4cc | 671 | BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show); |
6ab0a202 JM |
672 | |
673 | #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) | |
c1895442 | 674 | #define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj) |
6ab0a202 JM |
675 | |
676 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
677 | struct kobj_attribute *attr, char *buf); | |
a969f4cc HK |
678 | BTRFS_ATTR(raid, total_bytes, raid_bytes_show); |
679 | BTRFS_ATTR(raid, used_bytes, raid_bytes_show); | |
6ab0a202 JM |
680 | |
681 | static ssize_t raid_bytes_show(struct kobject *kobj, | |
682 | struct kobj_attribute *attr, char *buf) | |
683 | ||
684 | { | |
685 | struct btrfs_space_info *sinfo = to_space_info(kobj->parent); | |
32da5386 | 686 | struct btrfs_block_group *block_group; |
75cb379d | 687 | int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags); |
6ab0a202 JM |
688 | u64 val = 0; |
689 | ||
690 | down_read(&sinfo->groups_sem); | |
691 | list_for_each_entry(block_group, &sinfo->block_groups[index], list) { | |
a969f4cc | 692 | if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes)) |
b3470b5d | 693 | val += block_group->length; |
6ab0a202 | 694 | else |
bf38be65 | 695 | val += block_group->used; |
6ab0a202 JM |
696 | } |
697 | up_read(&sinfo->groups_sem); | |
020e5277 | 698 | return sysfs_emit(buf, "%llu\n", val); |
6ab0a202 JM |
699 | } |
700 | ||
e7849e33 AJ |
701 | /* |
702 | * Allocation information about block group profiles. | |
703 | * | |
704 | * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/ | |
705 | */ | |
7c7e3014 | 706 | static struct attribute *raid_attrs[] = { |
a969f4cc HK |
707 | BTRFS_ATTR_PTR(raid, total_bytes), |
708 | BTRFS_ATTR_PTR(raid, used_bytes), | |
6ab0a202 JM |
709 | NULL |
710 | }; | |
7c7e3014 | 711 | ATTRIBUTE_GROUPS(raid); |
6ab0a202 JM |
712 | |
713 | static void release_raid_kobj(struct kobject *kobj) | |
714 | { | |
c1895442 | 715 | kfree(to_raid_kobj(kobj)); |
6ab0a202 JM |
716 | } |
717 | ||
964a54e5 | 718 | static const struct kobj_type btrfs_raid_ktype = { |
6ab0a202 JM |
719 | .sysfs_ops = &kobj_sysfs_ops, |
720 | .release = release_raid_kobj, | |
7c7e3014 | 721 | .default_groups = raid_groups, |
6ab0a202 JM |
722 | }; |
723 | ||
724 | #define SPACE_INFO_ATTR(field) \ | |
725 | static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ | |
726 | struct kobj_attribute *a, \ | |
727 | char *buf) \ | |
728 | { \ | |
729 | struct btrfs_space_info *sinfo = to_space_info(kobj); \ | |
730 | return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ | |
731 | } \ | |
a969f4cc | 732 | BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field) |
6ab0a202 | 733 | |
19fc516a SR |
734 | static ssize_t btrfs_chunk_size_show(struct kobject *kobj, |
735 | struct kobj_attribute *a, char *buf) | |
736 | { | |
737 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
738 | ||
739 | return sysfs_emit(buf, "%llu\n", READ_ONCE(sinfo->chunk_size)); | |
740 | } | |
741 | ||
742 | /* | |
743 | * Store new chunk size in space info. Can be called on a read-only filesystem. | |
744 | * | |
745 | * If the new chunk size value is larger than 10% of free space it is reduced | |
746 | * to match that limit. Alignment must be to 256M and the system chunk size | |
747 | * cannot be set. | |
748 | */ | |
749 | static ssize_t btrfs_chunk_size_store(struct kobject *kobj, | |
750 | struct kobj_attribute *a, | |
751 | const char *buf, size_t len) | |
752 | { | |
753 | struct btrfs_space_info *space_info = to_space_info(kobj); | |
754 | struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); | |
755 | char *retptr; | |
756 | u64 val; | |
757 | ||
758 | if (!capable(CAP_SYS_ADMIN)) | |
759 | return -EPERM; | |
760 | ||
761 | if (!fs_info->fs_devices) | |
762 | return -EINVAL; | |
763 | ||
764 | if (btrfs_is_zoned(fs_info)) | |
765 | return -EINVAL; | |
766 | ||
767 | /* System block type must not be changed. */ | |
768 | if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM) | |
769 | return -EPERM; | |
770 | ||
771 | val = memparse(buf, &retptr); | |
772 | /* There could be trailing '\n', also catch any typos after the value */ | |
773 | retptr = skip_spaces(retptr); | |
774 | if (*retptr != 0 || val == 0) | |
775 | return -EINVAL; | |
776 | ||
777 | val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE); | |
778 | ||
779 | /* Limit stripe size to 10% of available space. */ | |
428c8e03 | 780 | val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val); |
19fc516a SR |
781 | |
782 | /* Must be multiple of 256M. */ | |
783 | val &= ~((u64)SZ_256M - 1); | |
784 | ||
785 | /* Must be at least 256M. */ | |
786 | if (val < SZ_256M) | |
787 | return -EINVAL; | |
788 | ||
789 | btrfs_update_space_info_chunk_size(space_info, val); | |
790 | ||
791 | return len; | |
792 | } | |
793 | ||
fcd9531b BB |
794 | static ssize_t btrfs_size_classes_show(struct kobject *kobj, |
795 | struct kobj_attribute *a, char *buf) | |
796 | { | |
797 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
798 | struct btrfs_block_group *bg; | |
799 | u32 none = 0; | |
800 | u32 small = 0; | |
801 | u32 medium = 0; | |
802 | u32 large = 0; | |
803 | ||
804 | for (int i = 0; i < BTRFS_NR_RAID_TYPES; ++i) { | |
805 | down_read(&sinfo->groups_sem); | |
806 | list_for_each_entry(bg, &sinfo->block_groups[i], list) { | |
807 | if (!btrfs_block_group_should_use_size_class(bg)) | |
808 | continue; | |
809 | switch (bg->size_class) { | |
810 | case BTRFS_BG_SZ_NONE: | |
811 | none++; | |
812 | break; | |
813 | case BTRFS_BG_SZ_SMALL: | |
814 | small++; | |
815 | break; | |
816 | case BTRFS_BG_SZ_MEDIUM: | |
817 | medium++; | |
818 | break; | |
819 | case BTRFS_BG_SZ_LARGE: | |
820 | large++; | |
821 | break; | |
822 | } | |
823 | } | |
824 | up_read(&sinfo->groups_sem); | |
825 | } | |
826 | return sysfs_emit(buf, "none %u\n" | |
827 | "small %u\n" | |
828 | "medium %u\n" | |
829 | "large %u\n", | |
830 | none, small, medium, large); | |
831 | } | |
832 | ||
22c55e3b SR |
833 | #ifdef CONFIG_BTRFS_DEBUG |
834 | /* | |
835 | * Request chunk allocation with current chunk size. | |
836 | */ | |
837 | static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj, | |
838 | struct kobj_attribute *a, | |
839 | const char *buf, size_t len) | |
840 | { | |
841 | struct btrfs_space_info *space_info = to_space_info(kobj); | |
842 | struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj)); | |
843 | struct btrfs_trans_handle *trans; | |
844 | bool val; | |
845 | int ret; | |
846 | ||
847 | if (!capable(CAP_SYS_ADMIN)) | |
848 | return -EPERM; | |
849 | ||
850 | if (sb_rdonly(fs_info->sb)) | |
851 | return -EROFS; | |
852 | ||
853 | ret = kstrtobool(buf, &val); | |
854 | if (ret) | |
855 | return ret; | |
856 | ||
857 | if (!val) | |
858 | return -EINVAL; | |
859 | ||
860 | /* | |
861 | * This is unsafe to be called from sysfs context and may cause | |
862 | * unexpected problems. | |
863 | */ | |
864 | trans = btrfs_start_transaction(fs_info->tree_root, 0); | |
865 | if (IS_ERR(trans)) | |
866 | return PTR_ERR(trans); | |
867 | ret = btrfs_force_chunk_alloc(trans, space_info->flags); | |
868 | btrfs_end_transaction(trans); | |
869 | ||
870 | if (ret == 1) | |
871 | return len; | |
872 | ||
873 | return -ENOSPC; | |
874 | } | |
875 | BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store); | |
876 | ||
877 | #endif | |
878 | ||
6ab0a202 JM |
879 | SPACE_INFO_ATTR(flags); |
880 | SPACE_INFO_ATTR(total_bytes); | |
881 | SPACE_INFO_ATTR(bytes_used); | |
882 | SPACE_INFO_ATTR(bytes_pinned); | |
883 | SPACE_INFO_ATTR(bytes_reserved); | |
884 | SPACE_INFO_ATTR(bytes_may_use); | |
c1fd5c30 | 885 | SPACE_INFO_ATTR(bytes_readonly); |
169e0da9 | 886 | SPACE_INFO_ATTR(bytes_zone_unusable); |
6ab0a202 JM |
887 | SPACE_INFO_ATTR(disk_used); |
888 | SPACE_INFO_ATTR(disk_total); | |
19fc516a | 889 | BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store); |
fcd9531b | 890 | BTRFS_ATTR(space_info, size_classes, btrfs_size_classes_show); |
6ab0a202 | 891 | |
bb5a098d JB |
892 | static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj, |
893 | struct kobj_attribute *a, | |
894 | char *buf) | |
895 | { | |
896 | struct btrfs_space_info *space_info = to_space_info(kobj); | |
bb5a098d | 897 | |
bd64f622 | 898 | return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->bg_reclaim_threshold)); |
bb5a098d JB |
899 | } |
900 | ||
901 | static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj, | |
902 | struct kobj_attribute *a, | |
903 | const char *buf, size_t len) | |
904 | { | |
905 | struct btrfs_space_info *space_info = to_space_info(kobj); | |
906 | int thresh; | |
907 | int ret; | |
908 | ||
909 | ret = kstrtoint(buf, 10, &thresh); | |
910 | if (ret) | |
911 | return ret; | |
912 | ||
ef972e7b | 913 | if (thresh < 0 || thresh > 100) |
bb5a098d JB |
914 | return -EINVAL; |
915 | ||
916 | WRITE_ONCE(space_info->bg_reclaim_threshold, thresh); | |
917 | ||
918 | return len; | |
919 | } | |
920 | ||
921 | BTRFS_ATTR_RW(space_info, bg_reclaim_threshold, | |
922 | btrfs_sinfo_bg_reclaim_threshold_show, | |
923 | btrfs_sinfo_bg_reclaim_threshold_store); | |
924 | ||
e7849e33 AJ |
925 | /* |
926 | * Allocation information about block group types. | |
927 | * | |
928 | * Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/ | |
929 | */ | |
6ab0a202 | 930 | static struct attribute *space_info_attrs[] = { |
a969f4cc HK |
931 | BTRFS_ATTR_PTR(space_info, flags), |
932 | BTRFS_ATTR_PTR(space_info, total_bytes), | |
933 | BTRFS_ATTR_PTR(space_info, bytes_used), | |
934 | BTRFS_ATTR_PTR(space_info, bytes_pinned), | |
935 | BTRFS_ATTR_PTR(space_info, bytes_reserved), | |
936 | BTRFS_ATTR_PTR(space_info, bytes_may_use), | |
937 | BTRFS_ATTR_PTR(space_info, bytes_readonly), | |
169e0da9 | 938 | BTRFS_ATTR_PTR(space_info, bytes_zone_unusable), |
a969f4cc HK |
939 | BTRFS_ATTR_PTR(space_info, disk_used), |
940 | BTRFS_ATTR_PTR(space_info, disk_total), | |
bb5a098d | 941 | BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold), |
19fc516a | 942 | BTRFS_ATTR_PTR(space_info, chunk_size), |
fcd9531b | 943 | BTRFS_ATTR_PTR(space_info, size_classes), |
22c55e3b SR |
944 | #ifdef CONFIG_BTRFS_DEBUG |
945 | BTRFS_ATTR_PTR(space_info, force_chunk_alloc), | |
946 | #endif | |
6ab0a202 JM |
947 | NULL, |
948 | }; | |
7c7e3014 | 949 | ATTRIBUTE_GROUPS(space_info); |
6ab0a202 JM |
950 | |
951 | static void space_info_release(struct kobject *kobj) | |
952 | { | |
953 | struct btrfs_space_info *sinfo = to_space_info(kobj); | |
6ab0a202 JM |
954 | kfree(sinfo); |
955 | } | |
956 | ||
964a54e5 | 957 | static const struct kobj_type space_info_ktype = { |
6ab0a202 JM |
958 | .sysfs_ops = &kobj_sysfs_ops, |
959 | .release = space_info_release, | |
7c7e3014 | 960 | .default_groups = space_info_groups, |
6ab0a202 JM |
961 | }; |
962 | ||
e7849e33 AJ |
963 | /* |
964 | * Allocation information about block groups. | |
965 | * | |
966 | * Path: /sys/fs/btrfs/<uuid>/allocation/ | |
967 | */ | |
6ab0a202 | 968 | static const struct attribute *allocation_attrs[] = { |
a969f4cc HK |
969 | BTRFS_ATTR_PTR(allocation, global_rsv_reserved), |
970 | BTRFS_ATTR_PTR(allocation, global_rsv_size), | |
6ab0a202 JM |
971 | NULL, |
972 | }; | |
973 | ||
f8ba9c11 JM |
974 | static ssize_t btrfs_label_show(struct kobject *kobj, |
975 | struct kobj_attribute *a, char *buf) | |
976 | { | |
977 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 978 | char *label = fs_info->super_copy->label; |
ee17fc80 DS |
979 | ssize_t ret; |
980 | ||
981 | spin_lock(&fs_info->super_lock); | |
020e5277 | 982 | ret = sysfs_emit(buf, label[0] ? "%s\n" : "%s", label); |
ee17fc80 DS |
983 | spin_unlock(&fs_info->super_lock); |
984 | ||
985 | return ret; | |
f8ba9c11 JM |
986 | } |
987 | ||
988 | static ssize_t btrfs_label_store(struct kobject *kobj, | |
989 | struct kobj_attribute *a, | |
990 | const char *buf, size_t len) | |
991 | { | |
992 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
48fcc3ff | 993 | size_t p_len; |
f8ba9c11 | 994 | |
66ac9fe7 DS |
995 | if (!fs_info) |
996 | return -EPERM; | |
997 | ||
bc98a42c | 998 | if (sb_rdonly(fs_info->sb)) |
79aec2b8 AJ |
999 | return -EROFS; |
1000 | ||
48fcc3ff ST |
1001 | /* |
1002 | * p_len is the len until the first occurrence of either | |
1003 | * '\n' or '\0' | |
1004 | */ | |
1005 | p_len = strcspn(buf, "\n"); | |
1006 | ||
1007 | if (p_len >= BTRFS_LABEL_SIZE) | |
f8ba9c11 | 1008 | return -EINVAL; |
f8ba9c11 | 1009 | |
a6f69dc8 | 1010 | spin_lock(&fs_info->super_lock); |
48fcc3ff ST |
1011 | memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); |
1012 | memcpy(fs_info->super_copy->label, buf, p_len); | |
a6f69dc8 | 1013 | spin_unlock(&fs_info->super_lock); |
f8ba9c11 | 1014 | |
a6f69dc8 DS |
1015 | /* |
1016 | * We don't want to do full transaction commit from inside sysfs | |
1017 | */ | |
c52cc7b7 | 1018 | set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags); |
a6f69dc8 | 1019 | wake_up_process(fs_info->transaction_kthread); |
f8ba9c11 | 1020 | |
a6f69dc8 | 1021 | return len; |
f8ba9c11 | 1022 | } |
a969f4cc | 1023 | BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store); |
f8ba9c11 | 1024 | |
df93589a DS |
1025 | static ssize_t btrfs_nodesize_show(struct kobject *kobj, |
1026 | struct kobj_attribute *a, char *buf) | |
1027 | { | |
1028 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1029 | ||
020e5277 | 1030 | return sysfs_emit(buf, "%u\n", fs_info->super_copy->nodesize); |
df93589a DS |
1031 | } |
1032 | ||
a969f4cc | 1033 | BTRFS_ATTR(, nodesize, btrfs_nodesize_show); |
df93589a DS |
1034 | |
1035 | static ssize_t btrfs_sectorsize_show(struct kobject *kobj, | |
1036 | struct kobj_attribute *a, char *buf) | |
1037 | { | |
1038 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1039 | ||
020e5277 | 1040 | return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize); |
df93589a DS |
1041 | } |
1042 | ||
a969f4cc | 1043 | BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show); |
df93589a | 1044 | |
140a8ff7 IA |
1045 | static ssize_t btrfs_commit_stats_show(struct kobject *kobj, |
1046 | struct kobj_attribute *a, char *buf) | |
1047 | { | |
1048 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1049 | ||
1050 | return sysfs_emit(buf, | |
1051 | "commits %llu\n" | |
1052 | "last_commit_ms %llu\n" | |
1053 | "max_commit_ms %llu\n" | |
1054 | "total_commit_ms %llu\n", | |
1055 | fs_info->commit_stats.commit_count, | |
1056 | div_u64(fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC), | |
1057 | div_u64(fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC), | |
1058 | div_u64(fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC)); | |
1059 | } | |
1060 | ||
1061 | static ssize_t btrfs_commit_stats_store(struct kobject *kobj, | |
1062 | struct kobj_attribute *a, | |
1063 | const char *buf, size_t len) | |
1064 | { | |
1065 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1066 | unsigned long val; | |
1067 | int ret; | |
1068 | ||
1069 | if (!fs_info) | |
1070 | return -EPERM; | |
1071 | ||
1072 | if (!capable(CAP_SYS_RESOURCE)) | |
1073 | return -EPERM; | |
1074 | ||
1075 | ret = kstrtoul(buf, 10, &val); | |
1076 | if (ret) | |
1077 | return ret; | |
1078 | if (val) | |
1079 | return -EINVAL; | |
1080 | ||
1081 | WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0); | |
1082 | ||
1083 | return len; | |
1084 | } | |
1085 | BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store); | |
1086 | ||
df93589a DS |
1087 | static ssize_t btrfs_clone_alignment_show(struct kobject *kobj, |
1088 | struct kobj_attribute *a, char *buf) | |
1089 | { | |
1090 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1091 | ||
020e5277 | 1092 | return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize); |
df93589a DS |
1093 | } |
1094 | ||
a969f4cc | 1095 | BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show); |
df93589a | 1096 | |
2723480a SD |
1097 | static ssize_t quota_override_show(struct kobject *kobj, |
1098 | struct kobj_attribute *a, char *buf) | |
1099 | { | |
1100 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1101 | int quota_override; | |
1102 | ||
1103 | quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
020e5277 | 1104 | return sysfs_emit(buf, "%d\n", quota_override); |
2723480a SD |
1105 | } |
1106 | ||
1107 | static ssize_t quota_override_store(struct kobject *kobj, | |
1108 | struct kobj_attribute *a, | |
1109 | const char *buf, size_t len) | |
1110 | { | |
1111 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1112 | unsigned long knob; | |
1113 | int err; | |
1114 | ||
1115 | if (!fs_info) | |
1116 | return -EPERM; | |
1117 | ||
1118 | if (!capable(CAP_SYS_RESOURCE)) | |
1119 | return -EPERM; | |
1120 | ||
1121 | err = kstrtoul(buf, 10, &knob); | |
1122 | if (err) | |
1123 | return err; | |
1124 | if (knob > 1) | |
1125 | return -EINVAL; | |
1126 | ||
1127 | if (knob) | |
1128 | set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
1129 | else | |
1130 | clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags); | |
1131 | ||
1132 | return len; | |
1133 | } | |
1134 | ||
a969f4cc | 1135 | BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store); |
2723480a | 1136 | |
56f20f40 NB |
1137 | static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj, |
1138 | struct kobj_attribute *a, char *buf) | |
1139 | { | |
1140 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1141 | ||
020e5277 | 1142 | return sysfs_emit(buf, "%pU\n", fs_info->fs_devices->metadata_uuid); |
56f20f40 NB |
1143 | } |
1144 | ||
1145 | BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show); | |
1146 | ||
41e6d2a8 JT |
1147 | static ssize_t btrfs_checksum_show(struct kobject *kobj, |
1148 | struct kobj_attribute *a, char *buf) | |
1149 | { | |
1150 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1151 | u16 csum_type = btrfs_super_csum_type(fs_info->super_copy); | |
1152 | ||
020e5277 AJ |
1153 | return sysfs_emit(buf, "%s (%s)\n", |
1154 | btrfs_super_csum_name(csum_type), | |
1155 | crypto_shash_driver_name(fs_info->csum_shash)); | |
41e6d2a8 JT |
1156 | } |
1157 | ||
1158 | BTRFS_ATTR(, checksum, btrfs_checksum_show); | |
1159 | ||
66a2823c GR |
1160 | static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, |
1161 | struct kobj_attribute *a, char *buf) | |
1162 | { | |
1163 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1164 | const char *str; | |
1165 | ||
1166 | switch (READ_ONCE(fs_info->exclusive_operation)) { | |
1167 | case BTRFS_EXCLOP_NONE: | |
1168 | str = "none\n"; | |
1169 | break; | |
1170 | case BTRFS_EXCLOP_BALANCE: | |
1171 | str = "balance\n"; | |
1172 | break; | |
3e1ad196 DS |
1173 | case BTRFS_EXCLOP_BALANCE_PAUSED: |
1174 | str = "balance paused\n"; | |
1175 | break; | |
66a2823c GR |
1176 | case BTRFS_EXCLOP_DEV_ADD: |
1177 | str = "device add\n"; | |
1178 | break; | |
1179 | case BTRFS_EXCLOP_DEV_REMOVE: | |
1180 | str = "device remove\n"; | |
1181 | break; | |
1182 | case BTRFS_EXCLOP_DEV_REPLACE: | |
1183 | str = "device replace\n"; | |
1184 | break; | |
1185 | case BTRFS_EXCLOP_RESIZE: | |
1186 | str = "resize\n"; | |
1187 | break; | |
1188 | case BTRFS_EXCLOP_SWAP_ACTIVATE: | |
1189 | str = "swap activate\n"; | |
1190 | break; | |
1191 | default: | |
1192 | str = "UNKNOWN\n"; | |
1193 | break; | |
1194 | } | |
020e5277 | 1195 | return sysfs_emit(buf, "%s", str); |
66a2823c GR |
1196 | } |
1197 | BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show); | |
1198 | ||
089c8b05 AJ |
1199 | static ssize_t btrfs_generation_show(struct kobject *kobj, |
1200 | struct kobj_attribute *a, char *buf) | |
1201 | { | |
1202 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1203 | ||
4a4f8fe2 | 1204 | return sysfs_emit(buf, "%llu\n", btrfs_get_fs_generation(fs_info)); |
089c8b05 AJ |
1205 | } |
1206 | BTRFS_ATTR(, generation, btrfs_generation_show); | |
1207 | ||
3d8cc17a AJ |
1208 | static const char * const btrfs_read_policy_name[] = { "pid" }; |
1209 | ||
1210 | static ssize_t btrfs_read_policy_show(struct kobject *kobj, | |
1211 | struct kobj_attribute *a, char *buf) | |
1212 | { | |
1213 | struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); | |
1214 | ssize_t ret = 0; | |
1215 | int i; | |
1216 | ||
1217 | for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { | |
1218 | if (fs_devices->read_policy == i) | |
467761f9 | 1219 | ret += sysfs_emit_at(buf, ret, "%s[%s]", |
3d8cc17a AJ |
1220 | (ret == 0 ? "" : " "), |
1221 | btrfs_read_policy_name[i]); | |
1222 | else | |
467761f9 | 1223 | ret += sysfs_emit_at(buf, ret, "%s%s", |
3d8cc17a AJ |
1224 | (ret == 0 ? "" : " "), |
1225 | btrfs_read_policy_name[i]); | |
1226 | } | |
1227 | ||
467761f9 | 1228 | ret += sysfs_emit_at(buf, ret, "\n"); |
3d8cc17a AJ |
1229 | |
1230 | return ret; | |
1231 | } | |
1232 | ||
1233 | static ssize_t btrfs_read_policy_store(struct kobject *kobj, | |
1234 | struct kobj_attribute *a, | |
1235 | const char *buf, size_t len) | |
1236 | { | |
1237 | struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj); | |
1238 | int i; | |
1239 | ||
1240 | for (i = 0; i < BTRFS_NR_READ_POLICY; i++) { | |
7f298f22 | 1241 | if (sysfs_streq(buf, btrfs_read_policy_name[i])) { |
3d8cc17a AJ |
1242 | if (i != fs_devices->read_policy) { |
1243 | fs_devices->read_policy = i; | |
1244 | btrfs_info(fs_devices->fs_info, | |
1245 | "read policy set to '%s'", | |
1246 | btrfs_read_policy_name[i]); | |
1247 | } | |
1248 | return len; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | return -EINVAL; | |
1253 | } | |
1254 | BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store); | |
1255 | ||
18bb8bbf JT |
1256 | static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj, |
1257 | struct kobj_attribute *a, | |
1258 | char *buf) | |
1259 | { | |
1260 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
18bb8bbf | 1261 | |
bd64f622 | 1262 | return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold)); |
18bb8bbf JT |
1263 | } |
1264 | ||
1265 | static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj, | |
1266 | struct kobj_attribute *a, | |
1267 | const char *buf, size_t len) | |
1268 | { | |
1269 | struct btrfs_fs_info *fs_info = to_fs_info(kobj); | |
1270 | int thresh; | |
1271 | int ret; | |
1272 | ||
1273 | ret = kstrtoint(buf, 10, &thresh); | |
1274 | if (ret) | |
1275 | return ret; | |
1276 | ||
d1cc5793 NA |
1277 | #ifdef CONFIG_BTRFS_DEBUG |
1278 | if (thresh != 0 && (thresh > 100)) | |
1279 | return -EINVAL; | |
1280 | #else | |
77233c2d | 1281 | if (thresh != 0 && (thresh <= 50 || thresh > 100)) |
18bb8bbf | 1282 | return -EINVAL; |
d1cc5793 | 1283 | #endif |
18bb8bbf | 1284 | |
77233c2d | 1285 | WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh); |
18bb8bbf JT |
1286 | |
1287 | return len; | |
1288 | } | |
1289 | BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show, | |
1290 | btrfs_bg_reclaim_threshold_store); | |
1291 | ||
e7849e33 AJ |
1292 | /* |
1293 | * Per-filesystem information and stats. | |
1294 | * | |
1295 | * Path: /sys/fs/btrfs/<uuid>/ | |
1296 | */ | |
0dd2906f | 1297 | static const struct attribute *btrfs_attrs[] = { |
a969f4cc HK |
1298 | BTRFS_ATTR_PTR(, label), |
1299 | BTRFS_ATTR_PTR(, nodesize), | |
1300 | BTRFS_ATTR_PTR(, sectorsize), | |
1301 | BTRFS_ATTR_PTR(, clone_alignment), | |
1302 | BTRFS_ATTR_PTR(, quota_override), | |
56f20f40 | 1303 | BTRFS_ATTR_PTR(, metadata_uuid), |
41e6d2a8 | 1304 | BTRFS_ATTR_PTR(, checksum), |
66a2823c | 1305 | BTRFS_ATTR_PTR(, exclusive_operation), |
089c8b05 | 1306 | BTRFS_ATTR_PTR(, generation), |
3d8cc17a | 1307 | BTRFS_ATTR_PTR(, read_policy), |
18bb8bbf | 1308 | BTRFS_ATTR_PTR(, bg_reclaim_threshold), |
140a8ff7 | 1309 | BTRFS_ATTR_PTR(, commit_stats), |
f8ba9c11 JM |
1310 | NULL, |
1311 | }; | |
1312 | ||
c1b7e474 | 1313 | static void btrfs_release_fsid_kobj(struct kobject *kobj) |
510d7360 | 1314 | { |
2e7910d6 | 1315 | struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj); |
248d200d | 1316 | |
c1b7e474 | 1317 | memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject)); |
2e7910d6 | 1318 | complete(&fs_devs->kobj_unregister); |
510d7360 JM |
1319 | } |
1320 | ||
964a54e5 | 1321 | static const struct kobj_type btrfs_ktype = { |
510d7360 | 1322 | .sysfs_ops = &kobj_sysfs_ops, |
c1b7e474 | 1323 | .release = btrfs_release_fsid_kobj, |
510d7360 JM |
1324 | }; |
1325 | ||
2e7910d6 AJ |
1326 | static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj) |
1327 | { | |
1328 | if (kobj->ktype != &btrfs_ktype) | |
1329 | return NULL; | |
c1b7e474 | 1330 | return container_of(kobj, struct btrfs_fs_devices, fsid_kobj); |
2e7910d6 AJ |
1331 | } |
1332 | ||
510d7360 JM |
1333 | static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) |
1334 | { | |
1335 | if (kobj->ktype != &btrfs_ktype) | |
1336 | return NULL; | |
2e7910d6 | 1337 | return to_fs_devs(kobj)->fs_info; |
510d7360 | 1338 | } |
58176a96 | 1339 | |
19fc516a SR |
1340 | static struct kobject *get_btrfs_kobj(struct kobject *kobj) |
1341 | { | |
1342 | while (kobj) { | |
1343 | if (kobj->ktype == &btrfs_ktype) | |
1344 | return kobj; | |
1345 | kobj = kobj->parent; | |
1346 | } | |
1347 | return NULL; | |
1348 | } | |
1349 | ||
e453d989 | 1350 | #define NUM_FEATURE_BITS 64 |
6c52157f TM |
1351 | #define BTRFS_FEATURE_NAME_MAX 13 |
1352 | static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX]; | |
1353 | static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS]; | |
e453d989 | 1354 | |
a55e65b8 DS |
1355 | static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) == |
1356 | ARRAY_SIZE(btrfs_feature_attrs)); | |
1357 | static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) == | |
1358 | ARRAY_SIZE(btrfs_feature_attrs[0])); | |
1359 | ||
6c52157f | 1360 | static const u64 supported_feature_masks[FEAT_MAX] = { |
e453d989 JM |
1361 | [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, |
1362 | [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, | |
1363 | [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, | |
1364 | }; | |
1365 | ||
1366 | static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) | |
1367 | { | |
1368 | int set; | |
1369 | ||
1370 | for (set = 0; set < FEAT_MAX; set++) { | |
1371 | int i; | |
1372 | struct attribute *attrs[2]; | |
1373 | struct attribute_group agroup = { | |
1374 | .name = "features", | |
1375 | .attrs = attrs, | |
1376 | }; | |
1377 | u64 features = get_features(fs_info, set); | |
1378 | features &= ~supported_feature_masks[set]; | |
1379 | ||
1380 | if (!features) | |
1381 | continue; | |
1382 | ||
1383 | attrs[1] = NULL; | |
1384 | for (i = 0; i < NUM_FEATURE_BITS; i++) { | |
1385 | struct btrfs_feature_attr *fa; | |
1386 | ||
1387 | if (!(features & (1ULL << i))) | |
1388 | continue; | |
1389 | ||
1390 | fa = &btrfs_feature_attrs[set][i]; | |
1391 | attrs[0] = &fa->kobj_attr.attr; | |
1392 | if (add) { | |
1393 | int ret; | |
c1b7e474 | 1394 | ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
1395 | &agroup); |
1396 | if (ret) | |
1397 | return ret; | |
1398 | } else | |
c1b7e474 | 1399 | sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj, |
e453d989 JM |
1400 | &agroup); |
1401 | } | |
1402 | ||
1403 | } | |
1404 | return 0; | |
1405 | } | |
1406 | ||
2e3e1281 | 1407 | static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 | 1408 | { |
a013d141 AJ |
1409 | if (fs_devs->devinfo_kobj) { |
1410 | kobject_del(fs_devs->devinfo_kobj); | |
1411 | kobject_put(fs_devs->devinfo_kobj); | |
1412 | fs_devs->devinfo_kobj = NULL; | |
1413 | } | |
1414 | ||
b5501504 AJ |
1415 | if (fs_devs->devices_kobj) { |
1416 | kobject_del(fs_devs->devices_kobj); | |
1417 | kobject_put(fs_devs->devices_kobj); | |
1418 | fs_devs->devices_kobj = NULL; | |
aaf13305 AJ |
1419 | } |
1420 | ||
c1b7e474 AJ |
1421 | if (fs_devs->fsid_kobj.state_initialized) { |
1422 | kobject_del(&fs_devs->fsid_kobj); | |
1423 | kobject_put(&fs_devs->fsid_kobj); | |
f90fc547 AJ |
1424 | wait_for_completion(&fs_devs->kobj_unregister); |
1425 | } | |
5ac1d209 JM |
1426 | } |
1427 | ||
2e3e1281 | 1428 | /* when fs_devs is NULL it will remove all fsid kobject */ |
1d1c1be3 | 1429 | void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) |
2e3e1281 AJ |
1430 | { |
1431 | struct list_head *fs_uuids = btrfs_get_fs_uuids(); | |
1432 | ||
1433 | if (fs_devs) { | |
1434 | __btrfs_sysfs_remove_fsid(fs_devs); | |
1435 | return; | |
1436 | } | |
1437 | ||
c4babc5e | 1438 | list_for_each_entry(fs_devs, fs_uuids, fs_list) { |
2e3e1281 AJ |
1439 | __btrfs_sysfs_remove_fsid(fs_devs); |
1440 | } | |
1441 | } | |
1442 | ||
53f8a74c AJ |
1443 | static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices) |
1444 | { | |
1445 | struct btrfs_device *device; | |
30b0e4e0 | 1446 | struct btrfs_fs_devices *seed; |
53f8a74c AJ |
1447 | |
1448 | list_for_each_entry(device, &fs_devices->devices, dev_list) | |
1449 | btrfs_sysfs_remove_device(device); | |
30b0e4e0 AJ |
1450 | |
1451 | list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { | |
1452 | list_for_each_entry(device, &seed->devices, dev_list) | |
1453 | btrfs_sysfs_remove_device(device); | |
1454 | } | |
53f8a74c AJ |
1455 | } |
1456 | ||
6618a59b | 1457 | void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) |
e453d989 | 1458 | { |
3092c68f NB |
1459 | struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; |
1460 | ||
3092c68f NB |
1461 | sysfs_remove_link(fsid_kobj, "bdi"); |
1462 | ||
e453d989 JM |
1463 | if (fs_info->space_info_kobj) { |
1464 | sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); | |
1465 | kobject_del(fs_info->space_info_kobj); | |
1466 | kobject_put(fs_info->space_info_kobj); | |
1467 | } | |
fb731430 DS |
1468 | if (fs_info->discard_kobj) { |
1469 | sysfs_remove_files(fs_info->discard_kobj, discard_attrs); | |
1470 | kobject_del(fs_info->discard_kobj); | |
1471 | kobject_put(fs_info->discard_kobj); | |
e4faab84 | 1472 | } |
fb731430 | 1473 | #ifdef CONFIG_BTRFS_DEBUG |
93945cb4 DZ |
1474 | if (fs_info->debug_kobj) { |
1475 | sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); | |
1476 | kobject_del(fs_info->debug_kobj); | |
1477 | kobject_put(fs_info->debug_kobj); | |
1478 | } | |
71e8978e | 1479 | #endif |
e453d989 | 1480 | addrm_unknown_feature_attrs(fs_info, false); |
3092c68f NB |
1481 | sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); |
1482 | sysfs_remove_files(fsid_kobj, btrfs_attrs); | |
53f8a74c | 1483 | btrfs_sysfs_remove_fs_devices(fs_info->fs_devices); |
e453d989 JM |
1484 | } |
1485 | ||
f10152bc | 1486 | static const char * const btrfs_feature_set_names[FEAT_MAX] = { |
79da4fa4 JM |
1487 | [FEAT_COMPAT] = "compat", |
1488 | [FEAT_COMPAT_RO] = "compat_ro", | |
1489 | [FEAT_INCOMPAT] = "incompat", | |
1490 | }; | |
1491 | ||
9e6df7ce | 1492 | const char *btrfs_feature_set_name(enum btrfs_feature_set set) |
f10152bc DS |
1493 | { |
1494 | return btrfs_feature_set_names[set]; | |
1495 | } | |
1496 | ||
3b02a68a JM |
1497 | char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) |
1498 | { | |
1499 | size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ | |
1500 | int len = 0; | |
1501 | int i; | |
1502 | char *str; | |
1503 | ||
1504 | str = kmalloc(bufsize, GFP_KERNEL); | |
1505 | if (!str) | |
1506 | return str; | |
1507 | ||
1508 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
1509 | const char *name; | |
1510 | ||
1511 | if (!(flags & (1ULL << i))) | |
1512 | continue; | |
1513 | ||
1514 | name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; | |
abdd9feb | 1515 | len += scnprintf(str + len, bufsize - len, "%s%s", |
3b02a68a JM |
1516 | len ? "," : "", name); |
1517 | } | |
1518 | ||
1519 | return str; | |
1520 | } | |
1521 | ||
79da4fa4 JM |
1522 | static void init_feature_attrs(void) |
1523 | { | |
1524 | struct btrfs_feature_attr *fa; | |
1525 | int set, i; | |
1526 | ||
3b02a68a JM |
1527 | memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); |
1528 | memset(btrfs_unknown_feature_names, 0, | |
1529 | sizeof(btrfs_unknown_feature_names)); | |
1530 | ||
79da4fa4 JM |
1531 | for (i = 0; btrfs_supported_feature_attrs[i]; i++) { |
1532 | struct btrfs_feature_attr *sfa; | |
1533 | struct attribute *a = btrfs_supported_feature_attrs[i]; | |
3b02a68a | 1534 | int bit; |
79da4fa4 | 1535 | sfa = attr_to_btrfs_feature_attr(a); |
3b02a68a JM |
1536 | bit = ilog2(sfa->feature_bit); |
1537 | fa = &btrfs_feature_attrs[sfa->feature_set][bit]; | |
79da4fa4 JM |
1538 | |
1539 | fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; | |
1540 | } | |
1541 | ||
1542 | for (set = 0; set < FEAT_MAX; set++) { | |
1543 | for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { | |
1544 | char *name = btrfs_unknown_feature_names[set][i]; | |
1545 | fa = &btrfs_feature_attrs[set][i]; | |
1546 | ||
1547 | if (fa->kobj_attr.attr.name) | |
1548 | continue; | |
1549 | ||
6c52157f | 1550 | snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u", |
79da4fa4 JM |
1551 | btrfs_feature_set_names[set], i); |
1552 | ||
1553 | fa->kobj_attr.attr.name = name; | |
1554 | fa->kobj_attr.attr.mode = S_IRUGO; | |
1555 | fa->feature_set = set; | |
1556 | fa->feature_bit = 1ULL << i; | |
1557 | } | |
1558 | } | |
1559 | } | |
1560 | ||
32a9991f DS |
1561 | /* |
1562 | * Create a sysfs entry for a given block group type at path | |
1563 | * /sys/fs/btrfs/UUID/allocation/data/TYPE | |
1564 | */ | |
32da5386 | 1565 | void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache) |
32a9991f DS |
1566 | { |
1567 | struct btrfs_fs_info *fs_info = cache->fs_info; | |
1568 | struct btrfs_space_info *space_info = cache->space_info; | |
1569 | struct raid_kobject *rkobj; | |
1570 | const int index = btrfs_bg_flags_to_raid_index(cache->flags); | |
1571 | unsigned int nofs_flag; | |
1572 | int ret; | |
1573 | ||
1574 | /* | |
1575 | * Setup a NOFS context because kobject_add(), deep in its call chain, | |
1576 | * does GFP_KERNEL allocations, and we are often called in a context | |
1577 | * where if reclaim is triggered we can deadlock (we are either holding | |
1578 | * a transaction handle or some lock required for a transaction | |
1579 | * commit). | |
1580 | */ | |
1581 | nofs_flag = memalloc_nofs_save(); | |
1582 | ||
1583 | rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS); | |
1584 | if (!rkobj) { | |
1585 | memalloc_nofs_restore(nofs_flag); | |
1586 | btrfs_warn(cache->fs_info, | |
1587 | "couldn't alloc memory for raid level kobject"); | |
1588 | return; | |
1589 | } | |
1590 | ||
1591 | rkobj->flags = cache->flags; | |
1592 | kobject_init(&rkobj->kobj, &btrfs_raid_ktype); | |
49ea112d JB |
1593 | |
1594 | /* | |
1595 | * We call this either on mount, or if we've created a block group for a | |
1596 | * new index type while running (i.e. when restriping). The running | |
1597 | * case is tricky because we could race with other threads, so we need | |
1598 | * to have this check to make sure we didn't already init the kobject. | |
1599 | * | |
1600 | * We don't have to protect on the free side because it only happens on | |
1601 | * unmount. | |
1602 | */ | |
1603 | spin_lock(&space_info->lock); | |
1604 | if (space_info->block_group_kobjs[index]) { | |
1605 | spin_unlock(&space_info->lock); | |
1606 | kobject_put(&rkobj->kobj); | |
1607 | return; | |
1608 | } else { | |
1609 | space_info->block_group_kobjs[index] = &rkobj->kobj; | |
1610 | } | |
1611 | spin_unlock(&space_info->lock); | |
1612 | ||
32a9991f DS |
1613 | ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s", |
1614 | btrfs_bg_type_to_raid_name(rkobj->flags)); | |
1615 | memalloc_nofs_restore(nofs_flag); | |
1616 | if (ret) { | |
49ea112d JB |
1617 | spin_lock(&space_info->lock); |
1618 | space_info->block_group_kobjs[index] = NULL; | |
1619 | spin_unlock(&space_info->lock); | |
32a9991f DS |
1620 | kobject_put(&rkobj->kobj); |
1621 | btrfs_warn(fs_info, | |
1622 | "failed to add kobject for block cache, ignoring"); | |
1623 | return; | |
1624 | } | |
32a9991f DS |
1625 | } |
1626 | ||
b5865bab DS |
1627 | /* |
1628 | * Remove sysfs directories for all block group types of a given space info and | |
1629 | * the space info as well | |
1630 | */ | |
1631 | void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info) | |
1632 | { | |
1633 | int i; | |
1634 | ||
1635 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { | |
1636 | struct kobject *kobj; | |
1637 | ||
1638 | kobj = space_info->block_group_kobjs[i]; | |
1639 | space_info->block_group_kobjs[i] = NULL; | |
1640 | if (kobj) { | |
1641 | kobject_del(kobj); | |
1642 | kobject_put(kobj); | |
1643 | } | |
1644 | } | |
1645 | kobject_del(&space_info->kobj); | |
1646 | kobject_put(&space_info->kobj); | |
1647 | } | |
1648 | ||
b882327a DS |
1649 | static const char *alloc_name(u64 flags) |
1650 | { | |
1651 | switch (flags) { | |
1652 | case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA: | |
1653 | return "mixed"; | |
1654 | case BTRFS_BLOCK_GROUP_METADATA: | |
1655 | return "metadata"; | |
1656 | case BTRFS_BLOCK_GROUP_DATA: | |
1657 | return "data"; | |
1658 | case BTRFS_BLOCK_GROUP_SYSTEM: | |
1659 | return "system"; | |
1660 | default: | |
1661 | WARN_ON(1); | |
1662 | return "invalid-combination"; | |
445d8ab5 | 1663 | } |
b882327a DS |
1664 | } |
1665 | ||
1666 | /* | |
1667 | * Create a sysfs entry for a space info type at path | |
1668 | * /sys/fs/btrfs/UUID/allocation/TYPE | |
1669 | */ | |
1670 | int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, | |
1671 | struct btrfs_space_info *space_info) | |
1672 | { | |
1673 | int ret; | |
1674 | ||
1675 | ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype, | |
1676 | fs_info->space_info_kobj, "%s", | |
1677 | alloc_name(space_info->flags)); | |
1678 | if (ret) { | |
1679 | kobject_put(&space_info->kobj); | |
1680 | return ret; | |
1681 | } | |
1682 | ||
1683 | return 0; | |
1684 | } | |
1685 | ||
53f8a74c | 1686 | void btrfs_sysfs_remove_device(struct btrfs_device *device) |
99994cde | 1687 | { |
985e233e | 1688 | struct kobject *devices_kobj; |
99994cde | 1689 | |
985e233e AJ |
1690 | /* |
1691 | * Seed fs_devices devices_kobj aren't used, fetch kobject from the | |
1692 | * fs_info::fs_devices. | |
1693 | */ | |
1694 | devices_kobj = device->fs_info->fs_devices->devices_kobj; | |
1695 | ASSERT(devices_kobj); | |
99994cde | 1696 | |
8d65269f CH |
1697 | if (device->bdev) |
1698 | sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); | |
668e48af | 1699 | |
985e233e AJ |
1700 | if (device->devid_kobj.state_initialized) { |
1701 | kobject_del(&device->devid_kobj); | |
1702 | kobject_put(&device->devid_kobj); | |
1703 | wait_for_completion(&device->kobj_unregister); | |
1704 | } | |
1705 | } | |
99994cde | 1706 | |
668e48af AJ |
1707 | static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj, |
1708 | struct kobj_attribute *a, | |
1709 | char *buf) | |
1710 | { | |
1711 | int val; | |
1712 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1713 | devid_kobj); | |
1714 | ||
1715 | val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); | |
1716 | ||
020e5277 | 1717 | return sysfs_emit(buf, "%d\n", val); |
668e48af AJ |
1718 | } |
1719 | BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show); | |
1720 | ||
25864778 | 1721 | static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj, |
668e48af AJ |
1722 | struct kobj_attribute *a, char *buf) |
1723 | { | |
1724 | int val; | |
1725 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1726 | devid_kobj); | |
1727 | ||
1728 | val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); | |
1729 | ||
020e5277 | 1730 | return sysfs_emit(buf, "%d\n", val); |
668e48af | 1731 | } |
25864778 | 1732 | BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show); |
668e48af AJ |
1733 | |
1734 | static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj, | |
1735 | struct kobj_attribute *a, | |
1736 | char *buf) | |
1737 | { | |
1738 | int val; | |
1739 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1740 | devid_kobj); | |
1741 | ||
1742 | val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); | |
1743 | ||
020e5277 | 1744 | return sysfs_emit(buf, "%d\n", val); |
668e48af AJ |
1745 | } |
1746 | BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show); | |
1747 | ||
eb3b5053 DS |
1748 | static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj, |
1749 | struct kobj_attribute *a, | |
1750 | char *buf) | |
1751 | { | |
1752 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1753 | devid_kobj); | |
1754 | ||
020e5277 | 1755 | return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max)); |
eb3b5053 DS |
1756 | } |
1757 | ||
1758 | static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj, | |
1759 | struct kobj_attribute *a, | |
1760 | const char *buf, size_t len) | |
1761 | { | |
1762 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1763 | devid_kobj); | |
1764 | char *endptr; | |
1765 | unsigned long long limit; | |
1766 | ||
1767 | limit = memparse(buf, &endptr); | |
1768 | WRITE_ONCE(device->scrub_speed_max, limit); | |
1769 | return len; | |
1770 | } | |
1771 | BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show, | |
1772 | btrfs_devinfo_scrub_speed_max_store); | |
1773 | ||
668e48af AJ |
1774 | static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj, |
1775 | struct kobj_attribute *a, char *buf) | |
1776 | { | |
1777 | int val; | |
1778 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1779 | devid_kobj); | |
1780 | ||
1781 | val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); | |
1782 | ||
020e5277 | 1783 | return sysfs_emit(buf, "%d\n", val); |
668e48af AJ |
1784 | } |
1785 | BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show); | |
1786 | ||
a26d60de AJ |
1787 | static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj, |
1788 | struct kobj_attribute *a, char *buf) | |
1789 | { | |
1790 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1791 | devid_kobj); | |
1792 | ||
1793 | return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid); | |
1794 | } | |
1795 | BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show); | |
1796 | ||
da658b57 DS |
1797 | static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj, |
1798 | struct kobj_attribute *a, char *buf) | |
1799 | { | |
1800 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1801 | devid_kobj); | |
1802 | ||
1803 | if (!device->dev_stats_valid) | |
020e5277 | 1804 | return sysfs_emit(buf, "invalid\n"); |
da658b57 DS |
1805 | |
1806 | /* | |
1807 | * Print all at once so we get a snapshot of all values from the same | |
1808 | * time. Keep them in sync and in order of definition of | |
1809 | * btrfs_dev_stat_values. | |
1810 | */ | |
020e5277 | 1811 | return sysfs_emit(buf, |
da658b57 DS |
1812 | "write_errs %d\n" |
1813 | "read_errs %d\n" | |
1814 | "flush_errs %d\n" | |
1815 | "corruption_errs %d\n" | |
1816 | "generation_errs %d\n", | |
1817 | btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS), | |
1818 | btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS), | |
1819 | btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS), | |
1820 | btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS), | |
1821 | btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS)); | |
1822 | } | |
1823 | BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show); | |
1824 | ||
e7849e33 AJ |
1825 | /* |
1826 | * Information about one device. | |
1827 | * | |
1828 | * Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/ | |
1829 | */ | |
668e48af | 1830 | static struct attribute *devid_attrs[] = { |
da658b57 | 1831 | BTRFS_ATTR_PTR(devid, error_stats), |
a26d60de | 1832 | BTRFS_ATTR_PTR(devid, fsid), |
668e48af AJ |
1833 | BTRFS_ATTR_PTR(devid, in_fs_metadata), |
1834 | BTRFS_ATTR_PTR(devid, missing), | |
1835 | BTRFS_ATTR_PTR(devid, replace_target), | |
eb3b5053 | 1836 | BTRFS_ATTR_PTR(devid, scrub_speed_max), |
668e48af AJ |
1837 | BTRFS_ATTR_PTR(devid, writeable), |
1838 | NULL | |
1839 | }; | |
1840 | ATTRIBUTE_GROUPS(devid); | |
1841 | ||
1842 | static void btrfs_release_devid_kobj(struct kobject *kobj) | |
1843 | { | |
1844 | struct btrfs_device *device = container_of(kobj, struct btrfs_device, | |
1845 | devid_kobj); | |
1846 | ||
1847 | memset(&device->devid_kobj, 0, sizeof(struct kobject)); | |
1848 | complete(&device->kobj_unregister); | |
1849 | } | |
1850 | ||
964a54e5 | 1851 | static const struct kobj_type devid_ktype = { |
668e48af AJ |
1852 | .sysfs_ops = &kobj_sysfs_ops, |
1853 | .default_groups = devid_groups, | |
1854 | .release = btrfs_release_devid_kobj, | |
1855 | }; | |
1856 | ||
cd36da2e | 1857 | int btrfs_sysfs_add_device(struct btrfs_device *device) |
00c921c2 | 1858 | { |
178a16c9 | 1859 | int ret; |
a47bd78d | 1860 | unsigned int nofs_flag; |
178a16c9 AJ |
1861 | struct kobject *devices_kobj; |
1862 | struct kobject *devinfo_kobj; | |
00c921c2 | 1863 | |
178a16c9 AJ |
1864 | /* |
1865 | * Make sure we use the fs_info::fs_devices to fetch the kobjects even | |
1866 | * for the seed fs_devices | |
1867 | */ | |
1868 | devices_kobj = device->fs_info->fs_devices->devices_kobj; | |
1869 | devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj; | |
1870 | ASSERT(devices_kobj); | |
1871 | ASSERT(devinfo_kobj); | |
f085381e | 1872 | |
178a16c9 | 1873 | nofs_flag = memalloc_nofs_save(); |
0d39376a | 1874 | |
178a16c9 | 1875 | if (device->bdev) { |
8d65269f | 1876 | struct kobject *disk_kobj = bdev_kobj(device->bdev); |
668e48af | 1877 | |
178a16c9 AJ |
1878 | ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); |
1879 | if (ret) { | |
1880 | btrfs_warn(device->fs_info, | |
1881 | "creating sysfs device link for devid %llu failed: %d", | |
1882 | device->devid, ret); | |
1883 | goto out; | |
668e48af | 1884 | } |
178a16c9 | 1885 | } |
29e5be24 | 1886 | |
178a16c9 AJ |
1887 | init_completion(&device->kobj_unregister); |
1888 | ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype, | |
1889 | devinfo_kobj, "%llu", device->devid); | |
1890 | if (ret) { | |
1891 | kobject_put(&device->devid_kobj); | |
1892 | btrfs_warn(device->fs_info, | |
1893 | "devinfo init for devid %llu failed: %d", | |
1894 | device->devid, ret); | |
29e5be24 | 1895 | } |
178a16c9 AJ |
1896 | |
1897 | out: | |
a47bd78d | 1898 | memalloc_nofs_restore(nofs_flag); |
178a16c9 AJ |
1899 | return ret; |
1900 | } | |
29e5be24 | 1901 | |
cd36da2e | 1902 | static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices) |
178a16c9 AJ |
1903 | { |
1904 | int ret; | |
cd36da2e | 1905 | struct btrfs_device *device; |
30b0e4e0 | 1906 | struct btrfs_fs_devices *seed; |
178a16c9 AJ |
1907 | |
1908 | list_for_each_entry(device, &fs_devices->devices, dev_list) { | |
1909 | ret = btrfs_sysfs_add_device(device); | |
1910 | if (ret) | |
7ad3912a | 1911 | goto fail; |
178a16c9 AJ |
1912 | } |
1913 | ||
30b0e4e0 AJ |
1914 | list_for_each_entry(seed, &fs_devices->seed_list, seed_list) { |
1915 | list_for_each_entry(device, &seed->devices, dev_list) { | |
1916 | ret = btrfs_sysfs_add_device(device); | |
1917 | if (ret) | |
7ad3912a | 1918 | goto fail; |
30b0e4e0 AJ |
1919 | } |
1920 | } | |
1921 | ||
178a16c9 | 1922 | return 0; |
7ad3912a AJ |
1923 | |
1924 | fail: | |
1925 | btrfs_sysfs_remove_fs_devices(fs_devices); | |
1926 | return ret; | |
29e5be24 JM |
1927 | } |
1928 | ||
5b28692e DS |
1929 | void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action) |
1930 | { | |
1931 | int ret; | |
1932 | ||
1933 | ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action); | |
1934 | if (ret) | |
1935 | pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n", | |
1936 | action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj), | |
1937 | &disk_to_dev(bdev->bd_disk)->kobj); | |
1938 | } | |
1939 | ||
8e560081 NB |
1940 | void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices) |
1941 | ||
f93c3997 DS |
1942 | { |
1943 | char fsid_buf[BTRFS_UUID_UNPARSED_SIZE]; | |
1944 | ||
1945 | /* | |
1946 | * Sprouting changes fsid of the mounted filesystem, rename the fsid | |
1947 | * directory | |
1948 | */ | |
8e560081 | 1949 | snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid); |
f93c3997 DS |
1950 | if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf)) |
1951 | btrfs_warn(fs_devices->fs_info, | |
1952 | "sysfs: failed to create fsid for sprout"); | |
1953 | } | |
1954 | ||
668e48af AJ |
1955 | void btrfs_sysfs_update_devid(struct btrfs_device *device) |
1956 | { | |
1957 | char tmp[24]; | |
1958 | ||
1959 | snprintf(tmp, sizeof(tmp), "%llu", device->devid); | |
1960 | ||
1961 | if (kobject_rename(&device->devid_kobj, tmp)) | |
1962 | btrfs_warn(device->fs_devices->fs_info, | |
1963 | "sysfs: failed to update devid for %llu", | |
1964 | device->devid); | |
1965 | } | |
1966 | ||
510d7360 JM |
1967 | /* /sys/fs/btrfs/ entry */ |
1968 | static struct kset *btrfs_kset; | |
1969 | ||
72059215 | 1970 | /* |
c6761a9e AJ |
1971 | * Creates: |
1972 | * /sys/fs/btrfs/UUID | |
1973 | * | |
72059215 | 1974 | * Can be called by the device discovery thread. |
72059215 | 1975 | */ |
c6761a9e | 1976 | int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs) |
5ac1d209 JM |
1977 | { |
1978 | int error; | |
1979 | ||
2e7910d6 | 1980 | init_completion(&fs_devs->kobj_unregister); |
c1b7e474 | 1981 | fs_devs->fsid_kobj.kset = btrfs_kset; |
c6761a9e AJ |
1982 | error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL, |
1983 | "%pU", fs_devs->fsid); | |
e3277335 TH |
1984 | if (error) { |
1985 | kobject_put(&fs_devs->fsid_kobj); | |
1986 | return error; | |
1987 | } | |
1988 | ||
bc036bb3 AJ |
1989 | fs_devs->devices_kobj = kobject_create_and_add("devices", |
1990 | &fs_devs->fsid_kobj); | |
1991 | if (!fs_devs->devices_kobj) { | |
1992 | btrfs_err(fs_devs->fs_info, | |
1993 | "failed to init sysfs device interface"); | |
1f6087e6 | 1994 | btrfs_sysfs_remove_fsid(fs_devs); |
bc036bb3 AJ |
1995 | return -ENOMEM; |
1996 | } | |
1997 | ||
a013d141 AJ |
1998 | fs_devs->devinfo_kobj = kobject_create_and_add("devinfo", |
1999 | &fs_devs->fsid_kobj); | |
2000 | if (!fs_devs->devinfo_kobj) { | |
2001 | btrfs_err(fs_devs->fs_info, | |
2002 | "failed to init sysfs devinfo kobject"); | |
2003 | btrfs_sysfs_remove_fsid(fs_devs); | |
2004 | return -ENOMEM; | |
2005 | } | |
2006 | ||
e3277335 | 2007 | return 0; |
72059215 AJ |
2008 | } |
2009 | ||
96f3136e | 2010 | int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) |
72059215 AJ |
2011 | { |
2012 | int error; | |
2e7910d6 | 2013 | struct btrfs_fs_devices *fs_devs = fs_info->fs_devices; |
c1b7e474 | 2014 | struct kobject *fsid_kobj = &fs_devs->fsid_kobj; |
72059215 | 2015 | |
cd36da2e | 2016 | error = btrfs_sysfs_add_fs_devices(fs_devs); |
b7c35e81 | 2017 | if (error) |
aaf13305 | 2018 | return error; |
aaf13305 | 2019 | |
c1b7e474 | 2020 | error = sysfs_create_files(fsid_kobj, btrfs_attrs); |
e453d989 | 2021 | if (error) { |
53f8a74c | 2022 | btrfs_sysfs_remove_fs_devices(fs_devs); |
e453d989 JM |
2023 | return error; |
2024 | } | |
79da4fa4 | 2025 | |
c1b7e474 | 2026 | error = sysfs_create_group(fsid_kobj, |
0dd2906f AJ |
2027 | &btrfs_feature_attr_group); |
2028 | if (error) | |
2029 | goto failure; | |
2030 | ||
6e369feb | 2031 | #ifdef CONFIG_BTRFS_DEBUG |
93945cb4 DZ |
2032 | fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj); |
2033 | if (!fs_info->debug_kobj) { | |
2034 | error = -ENOMEM; | |
2035 | goto failure; | |
2036 | } | |
2037 | ||
2038 | error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs); | |
6e369feb DS |
2039 | if (error) |
2040 | goto failure; | |
fb731430 | 2041 | #endif |
e4faab84 DZ |
2042 | |
2043 | /* Discard directory */ | |
fb731430 DS |
2044 | fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj); |
2045 | if (!fs_info->discard_kobj) { | |
e4faab84 DZ |
2046 | error = -ENOMEM; |
2047 | goto failure; | |
2048 | } | |
2049 | ||
fb731430 | 2050 | error = sysfs_create_files(fs_info->discard_kobj, discard_attrs); |
e4faab84 DZ |
2051 | if (error) |
2052 | goto failure; | |
6e369feb | 2053 | |
e453d989 | 2054 | error = addrm_unknown_feature_attrs(fs_info, true); |
79da4fa4 JM |
2055 | if (error) |
2056 | goto failure; | |
2057 | ||
3092c68f NB |
2058 | error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); |
2059 | if (error) | |
2060 | goto failure; | |
2061 | ||
6ab0a202 | 2062 | fs_info->space_info_kobj = kobject_create_and_add("allocation", |
c1b7e474 | 2063 | fsid_kobj); |
6ab0a202 JM |
2064 | if (!fs_info->space_info_kobj) { |
2065 | error = -ENOMEM; | |
2066 | goto failure; | |
2067 | } | |
2068 | ||
2069 | error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); | |
2070 | if (error) | |
2071 | goto failure; | |
2072 | ||
79da4fa4 JM |
2073 | return 0; |
2074 | failure: | |
6618a59b | 2075 | btrfs_sysfs_remove_mounted(fs_info); |
5ac1d209 JM |
2076 | return error; |
2077 | } | |
2078 | ||
ed2e35d8 QW |
2079 | static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj, |
2080 | struct kobj_attribute *a, | |
2081 | char *buf) | |
2082 | { | |
2083 | struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); | |
2084 | bool enabled; | |
2085 | ||
2086 | spin_lock(&fs_info->qgroup_lock); | |
2087 | enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON; | |
2088 | spin_unlock(&fs_info->qgroup_lock); | |
2089 | ||
2090 | return sysfs_emit(buf, "%d\n", enabled); | |
2091 | } | |
2092 | BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show); | |
2093 | ||
0182764a BB |
2094 | static ssize_t qgroup_mode_show(struct kobject *qgroups_kobj, |
2095 | struct kobj_attribute *a, | |
2096 | char *buf) | |
2097 | { | |
2098 | struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); | |
2099 | ssize_t ret = 0; | |
2100 | ||
2101 | spin_lock(&fs_info->qgroup_lock); | |
2102 | ASSERT(btrfs_qgroup_enabled(fs_info)); | |
2103 | switch (btrfs_qgroup_mode(fs_info)) { | |
2104 | case BTRFS_QGROUP_MODE_FULL: | |
2105 | ret = sysfs_emit(buf, "qgroup\n"); | |
2106 | break; | |
2107 | case BTRFS_QGROUP_MODE_SIMPLE: | |
2108 | ret = sysfs_emit(buf, "squota\n"); | |
2109 | break; | |
2110 | default: | |
2111 | btrfs_warn(fs_info, "unexpected qgroup mode %d\n", | |
2112 | btrfs_qgroup_mode(fs_info)); | |
2113 | break; | |
2114 | } | |
2115 | spin_unlock(&fs_info->qgroup_lock); | |
2116 | ||
2117 | return ret; | |
2118 | } | |
2119 | BTRFS_ATTR(qgroups, mode, qgroup_mode_show); | |
2120 | ||
ed2e35d8 QW |
2121 | static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, |
2122 | struct kobj_attribute *a, | |
2123 | char *buf) | |
2124 | { | |
2125 | struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); | |
2126 | bool inconsistent; | |
2127 | ||
2128 | spin_lock(&fs_info->qgroup_lock); | |
2129 | inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT); | |
2130 | spin_unlock(&fs_info->qgroup_lock); | |
2131 | ||
2132 | return sysfs_emit(buf, "%d\n", inconsistent); | |
2133 | } | |
2134 | BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); | |
2135 | ||
011b46c3 QW |
2136 | static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, |
2137 | struct kobj_attribute *a, | |
2138 | char *buf) | |
2139 | { | |
2140 | struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); | |
2141 | u8 result; | |
2142 | ||
2143 | spin_lock(&fs_info->qgroup_lock); | |
2144 | result = fs_info->qgroup_drop_subtree_thres; | |
2145 | spin_unlock(&fs_info->qgroup_lock); | |
2146 | ||
2147 | return sysfs_emit(buf, "%d\n", result); | |
2148 | } | |
2149 | ||
2150 | static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, | |
2151 | struct kobj_attribute *a, | |
2152 | const char *buf, size_t len) | |
2153 | { | |
2154 | struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); | |
2155 | u8 new_thres; | |
2156 | int ret; | |
2157 | ||
2158 | ret = kstrtou8(buf, 10, &new_thres); | |
2159 | if (ret) | |
2160 | return -EINVAL; | |
2161 | ||
2162 | if (new_thres > BTRFS_MAX_LEVEL) | |
2163 | return -EINVAL; | |
2164 | ||
2165 | spin_lock(&fs_info->qgroup_lock); | |
2166 | fs_info->qgroup_drop_subtree_thres = new_thres; | |
2167 | spin_unlock(&fs_info->qgroup_lock); | |
2168 | ||
2169 | return len; | |
2170 | } | |
2171 | BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, | |
2172 | qgroup_drop_subtree_thres_store); | |
2173 | ||
ed2e35d8 QW |
2174 | /* |
2175 | * Qgroups global info | |
2176 | * | |
2177 | * Path: /sys/fs/btrfs/<uuid>/qgroups/ | |
2178 | */ | |
2179 | static struct attribute *qgroups_attrs[] = { | |
2180 | BTRFS_ATTR_PTR(qgroups, enabled), | |
2181 | BTRFS_ATTR_PTR(qgroups, inconsistent), | |
011b46c3 | 2182 | BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), |
0182764a | 2183 | BTRFS_ATTR_PTR(qgroups, mode), |
ed2e35d8 QW |
2184 | NULL |
2185 | }; | |
2186 | ATTRIBUTE_GROUPS(qgroups); | |
2187 | ||
2188 | static void qgroups_release(struct kobject *kobj) | |
2189 | { | |
2190 | kfree(kobj); | |
2191 | } | |
2192 | ||
964a54e5 | 2193 | static const struct kobj_type qgroups_ktype = { |
ed2e35d8 QW |
2194 | .sysfs_ops = &kobj_sysfs_ops, |
2195 | .default_groups = qgroups_groups, | |
2196 | .release = qgroups_release, | |
2197 | }; | |
2198 | ||
49e5fb46 QW |
2199 | static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj) |
2200 | { | |
2201 | return to_fs_info(kobj->parent->parent); | |
2202 | } | |
2203 | ||
2204 | #define QGROUP_ATTR(_member, _show_name) \ | |
2205 | static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \ | |
2206 | struct kobj_attribute *a, \ | |
2207 | char *buf) \ | |
2208 | { \ | |
2209 | struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ | |
2210 | struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ | |
2211 | struct btrfs_qgroup, kobj); \ | |
2212 | return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \ | |
2213 | } \ | |
2214 | BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member) | |
2215 | ||
2216 | #define QGROUP_RSV_ATTR(_name, _type) \ | |
2217 | static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \ | |
2218 | struct kobj_attribute *a, \ | |
2219 | char *buf) \ | |
2220 | { \ | |
2221 | struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \ | |
2222 | struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \ | |
2223 | struct btrfs_qgroup, kobj); \ | |
2224 | return btrfs_show_u64(&qgroup->rsv.values[_type], \ | |
2225 | &fs_info->qgroup_lock, buf); \ | |
2226 | } \ | |
2227 | BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name) | |
2228 | ||
2229 | QGROUP_ATTR(rfer, referenced); | |
2230 | QGROUP_ATTR(excl, exclusive); | |
2231 | QGROUP_ATTR(max_rfer, max_referenced); | |
2232 | QGROUP_ATTR(max_excl, max_exclusive); | |
2233 | QGROUP_ATTR(lim_flags, limit_flags); | |
2234 | QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA); | |
2235 | QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS); | |
2236 | QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC); | |
2237 | ||
e7849e33 AJ |
2238 | /* |
2239 | * Qgroup information. | |
2240 | * | |
2241 | * Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/ | |
2242 | */ | |
49e5fb46 QW |
2243 | static struct attribute *qgroup_attrs[] = { |
2244 | BTRFS_ATTR_PTR(qgroup, referenced), | |
2245 | BTRFS_ATTR_PTR(qgroup, exclusive), | |
2246 | BTRFS_ATTR_PTR(qgroup, max_referenced), | |
2247 | BTRFS_ATTR_PTR(qgroup, max_exclusive), | |
2248 | BTRFS_ATTR_PTR(qgroup, limit_flags), | |
2249 | BTRFS_ATTR_PTR(qgroup, rsv_data), | |
2250 | BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans), | |
2251 | BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc), | |
2252 | NULL | |
2253 | }; | |
2254 | ATTRIBUTE_GROUPS(qgroup); | |
2255 | ||
2256 | static void qgroup_release(struct kobject *kobj) | |
2257 | { | |
2258 | struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj); | |
2259 | ||
2260 | memset(&qgroup->kobj, 0, sizeof(*kobj)); | |
2261 | } | |
2262 | ||
964a54e5 | 2263 | static const struct kobj_type qgroup_ktype = { |
49e5fb46 QW |
2264 | .sysfs_ops = &kobj_sysfs_ops, |
2265 | .release = qgroup_release, | |
2266 | .default_groups = qgroup_groups, | |
2267 | }; | |
2268 | ||
2269 | int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info, | |
2270 | struct btrfs_qgroup *qgroup) | |
2271 | { | |
2272 | struct kobject *qgroups_kobj = fs_info->qgroups_kobj; | |
2273 | int ret; | |
2274 | ||
2275 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
2276 | return 0; | |
2277 | if (qgroup->kobj.state_initialized) | |
2278 | return 0; | |
2279 | if (!qgroups_kobj) | |
2280 | return -EINVAL; | |
2281 | ||
2282 | ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj, | |
2283 | "%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid), | |
2284 | btrfs_qgroup_subvolid(qgroup->qgroupid)); | |
2285 | if (ret < 0) | |
2286 | kobject_put(&qgroup->kobj); | |
2287 | ||
2288 | return ret; | |
2289 | } | |
2290 | ||
2291 | void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info) | |
2292 | { | |
2293 | struct btrfs_qgroup *qgroup; | |
2294 | struct btrfs_qgroup *next; | |
2295 | ||
2296 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
2297 | return; | |
2298 | ||
2299 | rbtree_postorder_for_each_entry_safe(qgroup, next, | |
2300 | &fs_info->qgroup_tree, node) | |
2301 | btrfs_sysfs_del_one_qgroup(fs_info, qgroup); | |
62ab2cc0 QW |
2302 | if (fs_info->qgroups_kobj) { |
2303 | kobject_del(fs_info->qgroups_kobj); | |
2304 | kobject_put(fs_info->qgroups_kobj); | |
2305 | fs_info->qgroups_kobj = NULL; | |
2306 | } | |
49e5fb46 QW |
2307 | } |
2308 | ||
2309 | /* Called when qgroups get initialized, thus there is no need for locking */ | |
2310 | int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info) | |
2311 | { | |
2312 | struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; | |
2313 | struct btrfs_qgroup *qgroup; | |
2314 | struct btrfs_qgroup *next; | |
2315 | int ret = 0; | |
2316 | ||
2317 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
2318 | return 0; | |
2319 | ||
2320 | ASSERT(fsid_kobj); | |
2321 | if (fs_info->qgroups_kobj) | |
2322 | return 0; | |
2323 | ||
ed2e35d8 QW |
2324 | fs_info->qgroups_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); |
2325 | if (!fs_info->qgroups_kobj) | |
2326 | return -ENOMEM; | |
2327 | ||
2328 | ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype, | |
2329 | fsid_kobj, "qgroups"); | |
2330 | if (ret < 0) | |
49e5fb46 | 2331 | goto out; |
ed2e35d8 | 2332 | |
49e5fb46 QW |
2333 | rbtree_postorder_for_each_entry_safe(qgroup, next, |
2334 | &fs_info->qgroup_tree, node) { | |
2335 | ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup); | |
2336 | if (ret < 0) | |
2337 | goto out; | |
2338 | } | |
2339 | ||
2340 | out: | |
2341 | if (ret < 0) | |
2342 | btrfs_sysfs_del_qgroups(fs_info); | |
2343 | return ret; | |
2344 | } | |
2345 | ||
2346 | void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info, | |
2347 | struct btrfs_qgroup *qgroup) | |
2348 | { | |
2349 | if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state)) | |
2350 | return; | |
2351 | ||
2352 | if (qgroup->kobj.state_initialized) { | |
2353 | kobject_del(&qgroup->kobj); | |
2354 | kobject_put(&qgroup->kobj); | |
2355 | } | |
2356 | } | |
444e7516 DS |
2357 | |
2358 | /* | |
2359 | * Change per-fs features in /sys/fs/btrfs/UUID/features to match current | |
2360 | * values in superblock. Call after any changes to incompat/compat_ro flags | |
2361 | */ | |
b7625f46 | 2362 | void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info) |
444e7516 | 2363 | { |
444e7516 | 2364 | struct kobject *fsid_kobj; |
b7625f46 | 2365 | int ret; |
444e7516 DS |
2366 | |
2367 | if (!fs_info) | |
2368 | return; | |
2369 | ||
b7625f46 | 2370 | fsid_kobj = &fs_info->fs_devices->fsid_kobj; |
bf609206 DS |
2371 | if (!fsid_kobj->state_initialized) |
2372 | return; | |
2373 | ||
b7625f46 QW |
2374 | ret = sysfs_update_group(fsid_kobj, &btrfs_feature_attr_group); |
2375 | if (ret < 0) | |
2376 | btrfs_warn(fs_info, | |
2377 | "failed to update /sys/fs/btrfs/%pU/features: %d", | |
2378 | fs_info->fs_devices->fsid, ret); | |
444e7516 DS |
2379 | } |
2380 | ||
f5c29bd9 | 2381 | int __init btrfs_init_sysfs(void) |
58176a96 | 2382 | { |
079b72bc | 2383 | int ret; |
1bae3098 | 2384 | |
e3fe4e71 GKH |
2385 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
2386 | if (!btrfs_kset) | |
2387 | return -ENOMEM; | |
079b72bc | 2388 | |
1bae3098 | 2389 | init_feature_attrs(); |
079b72bc | 2390 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
001a648d FM |
2391 | if (ret) |
2392 | goto out2; | |
f902bd3a MT |
2393 | ret = sysfs_merge_group(&btrfs_kset->kobj, |
2394 | &btrfs_static_feature_attr_group); | |
2395 | if (ret) | |
2396 | goto out_remove_group; | |
001a648d | 2397 | |
6e369feb DS |
2398 | #ifdef CONFIG_BTRFS_DEBUG |
2399 | ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
ffdbb44f ZL |
2400 | if (ret) { |
2401 | sysfs_unmerge_group(&btrfs_kset->kobj, | |
2402 | &btrfs_static_feature_attr_group); | |
2403 | goto out_remove_group; | |
2404 | } | |
6e369feb DS |
2405 | #endif |
2406 | ||
001a648d | 2407 | return 0; |
f902bd3a MT |
2408 | |
2409 | out_remove_group: | |
2410 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); | |
001a648d | 2411 | out2: |
001a648d | 2412 | kset_unregister(btrfs_kset); |
079b72bc | 2413 | |
1bae3098 | 2414 | return ret; |
58176a96 JB |
2415 | } |
2416 | ||
e67c718b | 2417 | void __cold btrfs_exit_sysfs(void) |
58176a96 | 2418 | { |
f902bd3a MT |
2419 | sysfs_unmerge_group(&btrfs_kset->kobj, |
2420 | &btrfs_static_feature_attr_group); | |
079b72bc | 2421 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); |
71e8978e DZ |
2422 | #ifdef CONFIG_BTRFS_DEBUG |
2423 | sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group); | |
2424 | #endif | |
e3fe4e71 | 2425 | kset_unregister(btrfs_kset); |
58176a96 | 2426 | } |