1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/sysfs.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Theodore Ts'o (tytso@mit.edu)
8 *
9 */
10
11#include <linux/time.h>
12#include <linux/fs.h>
13#include <linux/seq_file.h>
14#include <linux/slab.h>
15#include <linux/proc_fs.h>
16#include <linux/part_stat.h>
17
18#include "ext4.h"
19#include "ext4_jbd2.h"
20
21typedef enum {
22 attr_noop,
23 attr_delayed_allocation_blocks,
24 attr_session_write_kbytes,
25 attr_lifetime_write_kbytes,
26 attr_reserved_clusters,
27 attr_sra_exceeded_retry_limit,
28 attr_inode_readahead,
29 attr_trigger_test_error,
30 attr_first_error_time,
31 attr_last_error_time,
32 attr_clusters_in_group,
33 attr_mb_order,
34 attr_feature,
35 attr_pointer_pi,
36 attr_pointer_ui,
37 attr_pointer_ul,
38 attr_pointer_u64,
39 attr_pointer_u8,
40 attr_pointer_string,
41 attr_pointer_atomic,
42 attr_journal_task,
43} attr_id_t;
44
45typedef enum {
46 ptr_explicit,
47 ptr_ext4_sb_info_offset,
48 ptr_ext4_super_block_offset,
49} attr_ptr_t;
50
51static const char proc_dirname[] = "fs/ext4";
52static struct proc_dir_entry *ext4_proc_root;
53
54struct ext4_attr {
55 struct attribute attr;
56 short attr_id;
57 short attr_ptr;
58 unsigned short attr_size;
59 union {
60 int offset;
61 void *explicit_ptr;
62 } u;
63};
64
65static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
66{
67 struct super_block *sb = sbi->s_buddy_cache->i_sb;
68
69 return sysfs_emit(buf, fmt: "%lu\n",
70 (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
71 sbi->s_sectors_written_start) >> 1);
72}
73
74static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
75{
76 struct super_block *sb = sbi->s_buddy_cache->i_sb;
77
78 return sysfs_emit(buf, fmt: "%llu\n",
79 (unsigned long long)(sbi->s_kbytes_written +
80 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
81 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
82}
83
84static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
85 const char *buf, size_t count)
86{
87 unsigned long t;
88 int ret;
89
90 ret = kstrtoul(s: skip_spaces(buf), base: 0, res: &t);
91 if (ret)
92 return ret;
93
94 if (t && (!is_power_of_2(n: t) || t > 0x40000000))
95 return -EINVAL;
96
97 sbi->s_inode_readahead_blks = t;
98 return count;
99}
100
101static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
102 const char *buf, size_t count)
103{
104 unsigned long long val;
105 ext4_fsblk_t clusters = (ext4_blocks_count(es: sbi->s_es) >>
106 sbi->s_cluster_bits);
107 int ret;
108
109 ret = kstrtoull(s: skip_spaces(buf), base: 0, res: &val);
110 if (ret || val >= clusters || (s64)val < 0)
111 return -EINVAL;
112
113 atomic64_set(v: &sbi->s_resv_clusters, i: val);
114 return count;
115}
116
117static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
118 const char *buf, size_t count)
119{
120 int len = count;
121
122 if (!capable(CAP_SYS_ADMIN))
123 return -EPERM;
124
125 if (len && buf[len-1] == '\n')
126 len--;
127
128 if (len)
129 ext4_error(sbi->s_sb, "%.*s", len, buf);
130 return count;
131}
132
133static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
134{
135 if (!sbi->s_journal)
136 return sysfs_emit(buf, fmt: "<none>\n");
137 return sysfs_emit(buf, fmt: "%d\n",
138 task_pid_vnr(tsk: sbi->s_journal->j_task));
139}
140
141#define EXT4_ATTR(_name,_mode,_id) \
142static struct ext4_attr ext4_attr_##_name = { \
143 .attr = {.name = __stringify(_name), .mode = _mode }, \
144 .attr_id = attr_##_id, \
145}
146
147#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
148
149#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
150
151#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
152static struct ext4_attr ext4_attr_##_name = { \
153 .attr = {.name = __stringify(_name), .mode = _mode }, \
154 .attr_id = attr_##_id, \
155 .attr_ptr = ptr_##_struct##_offset, \
156 .u = { \
157 .offset = offsetof(struct _struct, _elname),\
158 }, \
159}
160
161#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \
162static struct ext4_attr ext4_attr_##_name = { \
163 .attr = {.name = __stringify(_name), .mode = _mode }, \
164 .attr_id = attr_pointer_string, \
165 .attr_size = _size, \
166 .attr_ptr = ptr_##_struct##_offset, \
167 .u = { \
168 .offset = offsetof(struct _struct, _elname),\
169 }, \
170}
171
172#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
173 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
174
175#define EXT4_RO_ATTR_ES_U8(_name,_elname) \
176 EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname)
177
178#define EXT4_RO_ATTR_ES_U64(_name,_elname) \
179 EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname)
180
181#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \
182 EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname)
183
184#define EXT4_RW_ATTR_SBI_PI(_name,_elname) \
185 EXT4_ATTR_OFFSET(_name, 0644, pointer_pi, ext4_sb_info, _elname)
186
187#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
188 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
189
190#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \
191 EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)
192
193#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \
194 EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname)
195
196#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
197static struct ext4_attr ext4_attr_##_name = { \
198 .attr = {.name = __stringify(_name), .mode = _mode }, \
199 .attr_id = attr_##_id, \
200 .attr_ptr = ptr_explicit, \
201 .u = { \
202 .explicit_ptr = _ptr, \
203 }, \
204}
205
206#define ATTR_LIST(name) &ext4_attr_##name.attr
207
208EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
209EXT4_ATTR_FUNC(session_write_kbytes, 0444);
210EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
211EXT4_ATTR_FUNC(reserved_clusters, 0644);
212EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444);
213
214EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
215 ext4_sb_info, s_inode_readahead_blks);
216EXT4_ATTR_OFFSET(mb_group_prealloc, 0644, clusters_in_group,
217 ext4_sb_info, s_mb_group_prealloc);
218EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order,
219 ext4_sb_info, s_mb_best_avail_max_trim_order);
220EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
221EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
222EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
223EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
224EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
225EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
226EXT4_RW_ATTR_SBI_UI(mb_max_linear_groups, s_mb_max_linear_groups);
227EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
228EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
229EXT4_RW_ATTR_SBI_PI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
230EXT4_RW_ATTR_SBI_PI(err_ratelimit_burst, s_err_ratelimit_state.burst);
231EXT4_RW_ATTR_SBI_PI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
232EXT4_RW_ATTR_SBI_PI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
233EXT4_RW_ATTR_SBI_PI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
234EXT4_RW_ATTR_SBI_PI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
235#ifdef CONFIG_EXT4_DEBUG
236EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
237#endif
238EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
239EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
240EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
241EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
242EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
243EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
244EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
245EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
246EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
247EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
248EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
249EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
250EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
251EXT4_ATTR(first_error_time, 0444, first_error_time);
252EXT4_ATTR(last_error_time, 0444, last_error_time);
253EXT4_ATTR(journal_task, 0444, journal_task);
254EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
255EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
256EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks);
257EXT4_RW_ATTR_SBI_UI(sb_update_sec, s_sb_update_sec);
258EXT4_RW_ATTR_SBI_UI(sb_update_kb, s_sb_update_kb);
259
260static unsigned int old_bump_val = 128;
261EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
262
263static struct attribute *ext4_attrs[] = {
264 ATTR_LIST(delayed_allocation_blocks),
265 ATTR_LIST(session_write_kbytes),
266 ATTR_LIST(lifetime_write_kbytes),
267 ATTR_LIST(reserved_clusters),
268 ATTR_LIST(sra_exceeded_retry_limit),
269 ATTR_LIST(inode_readahead_blks),
270 ATTR_LIST(inode_goal),
271 ATTR_LIST(mb_stats),
272 ATTR_LIST(mb_max_to_scan),
273 ATTR_LIST(mb_min_to_scan),
274 ATTR_LIST(mb_order2_req),
275 ATTR_LIST(mb_stream_req),
276 ATTR_LIST(mb_group_prealloc),
277 ATTR_LIST(mb_max_linear_groups),
278 ATTR_LIST(max_writeback_mb_bump),
279 ATTR_LIST(extent_max_zeroout_kb),
280 ATTR_LIST(trigger_fs_error),
281 ATTR_LIST(err_ratelimit_interval_ms),
282 ATTR_LIST(err_ratelimit_burst),
283 ATTR_LIST(warning_ratelimit_interval_ms),
284 ATTR_LIST(warning_ratelimit_burst),
285 ATTR_LIST(msg_ratelimit_interval_ms),
286 ATTR_LIST(msg_ratelimit_burst),
287 ATTR_LIST(mb_best_avail_max_trim_order),
288 ATTR_LIST(errors_count),
289 ATTR_LIST(warning_count),
290 ATTR_LIST(msg_count),
291 ATTR_LIST(first_error_ino),
292 ATTR_LIST(last_error_ino),
293 ATTR_LIST(first_error_block),
294 ATTR_LIST(last_error_block),
295 ATTR_LIST(first_error_line),
296 ATTR_LIST(last_error_line),
297 ATTR_LIST(first_error_func),
298 ATTR_LIST(last_error_func),
299 ATTR_LIST(first_error_errcode),
300 ATTR_LIST(last_error_errcode),
301 ATTR_LIST(first_error_time),
302 ATTR_LIST(last_error_time),
303 ATTR_LIST(journal_task),
304#ifdef CONFIG_EXT4_DEBUG
305 ATTR_LIST(simulate_fail),
306#endif
307 ATTR_LIST(mb_prefetch),
308 ATTR_LIST(mb_prefetch_limit),
309 ATTR_LIST(last_trim_minblks),
310 ATTR_LIST(sb_update_sec),
311 ATTR_LIST(sb_update_kb),
312 NULL,
313};
314ATTRIBUTE_GROUPS(ext4);
315
316/* Features this copy of ext4 supports */
317EXT4_ATTR_FEATURE(lazy_itable_init);
318EXT4_ATTR_FEATURE(batched_discard);
319EXT4_ATTR_FEATURE(meta_bg_resize);
320#ifdef CONFIG_FS_ENCRYPTION
321EXT4_ATTR_FEATURE(encryption);
322EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
323#endif
324#if IS_ENABLED(CONFIG_UNICODE)
325EXT4_ATTR_FEATURE(casefold);
326#endif
327#ifdef CONFIG_FS_VERITY
328EXT4_ATTR_FEATURE(verity);
329#endif
330EXT4_ATTR_FEATURE(metadata_csum_seed);
331EXT4_ATTR_FEATURE(fast_commit);
332#if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION)
333EXT4_ATTR_FEATURE(encrypted_casefold);
334#endif
335#ifdef CONFIG_TRANSPARENT_HUGEPAGE
336EXT4_ATTR_FEATURE(blocksize_gt_pagesize);
337#endif
338
339static struct attribute *ext4_feat_attrs[] = {
340 ATTR_LIST(lazy_itable_init),
341 ATTR_LIST(batched_discard),
342 ATTR_LIST(meta_bg_resize),
343#ifdef CONFIG_FS_ENCRYPTION
344 ATTR_LIST(encryption),
345 ATTR_LIST(test_dummy_encryption_v2),
346#endif
347#if IS_ENABLED(CONFIG_UNICODE)
348 ATTR_LIST(casefold),
349#endif
350#ifdef CONFIG_FS_VERITY
351 ATTR_LIST(verity),
352#endif
353 ATTR_LIST(metadata_csum_seed),
354 ATTR_LIST(fast_commit),
355#if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION)
356 ATTR_LIST(encrypted_casefold),
357#endif
358#ifdef CONFIG_TRANSPARENT_HUGEPAGE
359 ATTR_LIST(blocksize_gt_pagesize),
360#endif
361 NULL,
362};
363ATTRIBUTE_GROUPS(ext4_feat);
364
365static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
366{
367 switch (a->attr_ptr) {
368 case ptr_explicit:
369 return a->u.explicit_ptr;
370 case ptr_ext4_sb_info_offset:
371 return (void *) (((char *) sbi) + a->u.offset);
372 case ptr_ext4_super_block_offset:
373 return (void *) (((char *) sbi->s_es) + a->u.offset);
374 }
375 return NULL;
376}
377
378static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
379{
380 return sysfs_emit(buf, fmt: "%lld\n",
381 ((time64_t)hi << 32) + le32_to_cpu(lo));
382}
383
384#define print_tstamp(buf, es, tstamp) \
385 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
386
387static ssize_t ext4_generic_attr_show(struct ext4_attr *a,
388 struct ext4_sb_info *sbi, char *buf)
389{
390 void *ptr = calc_ptr(a, sbi);
391
392 if (!ptr)
393 return 0;
394
395 switch (a->attr_id) {
396 case attr_inode_readahead:
397 case attr_clusters_in_group:
398 case attr_mb_order:
399 case attr_pointer_pi:
400 case attr_pointer_ui:
401 if (a->attr_ptr == ptr_ext4_super_block_offset)
402 return sysfs_emit(buf, fmt: "%u\n", le32_to_cpup(p: ptr));
403 return sysfs_emit(buf, fmt: "%u\n", *((unsigned int *) ptr));
404 case attr_pointer_ul:
405 return sysfs_emit(buf, fmt: "%lu\n", *((unsigned long *) ptr));
406 case attr_pointer_u8:
407 return sysfs_emit(buf, fmt: "%u\n", *((unsigned char *) ptr));
408 case attr_pointer_u64:
409 if (a->attr_ptr == ptr_ext4_super_block_offset)
410 return sysfs_emit(buf, fmt: "%llu\n", le64_to_cpup(p: ptr));
411 return sysfs_emit(buf, fmt: "%llu\n", *((unsigned long long *) ptr));
412 case attr_pointer_string:
413 return sysfs_emit(buf, fmt: "%.*s\n", a->attr_size, (char *) ptr);
414 case attr_pointer_atomic:
415 return sysfs_emit(buf, fmt: "%d\n", atomic_read(v: (atomic_t *) ptr));
416 }
417 return 0;
418}
419
420static ssize_t ext4_attr_show(struct kobject *kobj,
421 struct attribute *attr, char *buf)
422{
423 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
424 s_kobj);
425 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
426
427 switch (a->attr_id) {
428 case attr_delayed_allocation_blocks:
429 return sysfs_emit(buf, fmt: "%llu\n",
430 (s64) EXT4_C2B(sbi,
431 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
432 case attr_session_write_kbytes:
433 return session_write_kbytes_show(sbi, buf);
434 case attr_lifetime_write_kbytes:
435 return lifetime_write_kbytes_show(sbi, buf);
436 case attr_reserved_clusters:
437 return sysfs_emit(buf, fmt: "%llu\n",
438 (unsigned long long)
439 atomic64_read(v: &sbi->s_resv_clusters));
440 case attr_sra_exceeded_retry_limit:
441 return sysfs_emit(buf, fmt: "%llu\n",
442 (unsigned long long)
443 percpu_counter_sum(fbc: &sbi->s_sra_exceeded_retry_limit));
444 case attr_feature:
445 return sysfs_emit(buf, fmt: "supported\n");
446 case attr_first_error_time:
447 return print_tstamp(buf, sbi->s_es, s_first_error_time);
448 case attr_last_error_time:
449 return print_tstamp(buf, sbi->s_es, s_last_error_time);
450 case attr_journal_task:
451 return journal_task_show(sbi, buf);
452 default:
453 return ext4_generic_attr_show(a, sbi, buf);
454 }
455}
456
457static ssize_t ext4_generic_attr_store(struct ext4_attr *a,
458 struct ext4_sb_info *sbi,
459 const char *buf, size_t len)
460{
461 int ret;
462 unsigned int t;
463 unsigned long lt;
464 void *ptr = calc_ptr(a, sbi);
465
466 if (!ptr)
467 return 0;
468
469 switch (a->attr_id) {
470 case attr_pointer_pi:
471 ret = kstrtouint(s: skip_spaces(buf), base: 0, res: &t);
472 if (ret)
473 return ret;
474 if ((int)t < 0)
475 return -EINVAL;
476 *((unsigned int *) ptr) = t;
477 return len;
478 case attr_pointer_ui:
479 ret = kstrtouint(s: skip_spaces(buf), base: 0, res: &t);
480 if (ret)
481 return ret;
482 if (a->attr_ptr == ptr_ext4_super_block_offset)
483 *((__le32 *) ptr) = cpu_to_le32(t);
484 else
485 *((unsigned int *) ptr) = t;
486 return len;
487 case attr_mb_order:
488 ret = kstrtouint(s: skip_spaces(buf), base: 0, res: &t);
489 if (ret)
490 return ret;
491 if (t > 64)
492 return -EINVAL;
493 *((unsigned int *) ptr) = t;
494 return len;
495 case attr_clusters_in_group:
496 ret = kstrtouint(s: skip_spaces(buf), base: 0, res: &t);
497 if (ret)
498 return ret;
499 if (t > sbi->s_clusters_per_group)
500 return -EINVAL;
501 *((unsigned int *) ptr) = t;
502 return len;
503 case attr_pointer_ul:
504 ret = kstrtoul(s: skip_spaces(buf), base: 0, res: &lt);
505 if (ret)
506 return ret;
507 *((unsigned long *) ptr) = lt;
508 return len;
509 }
510 return 0;
511}
512
513static ssize_t ext4_attr_store(struct kobject *kobj,
514 struct attribute *attr,
515 const char *buf, size_t len)
516{
517 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
518 s_kobj);
519 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
520
521 switch (a->attr_id) {
522 case attr_reserved_clusters:
523 return reserved_clusters_store(sbi, buf, count: len);
524 case attr_inode_readahead:
525 return inode_readahead_blks_store(sbi, buf, count: len);
526 case attr_trigger_test_error:
527 return trigger_test_error(sbi, buf, count: len);
528 default:
529 return ext4_generic_attr_store(a, sbi, buf, len);
530 }
531}
532
533static void ext4_sb_release(struct kobject *kobj)
534{
535 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
536 s_kobj);
537 complete(&sbi->s_kobj_unregister);
538}
539
540static void ext4_feat_release(struct kobject *kobj)
541{
542 kfree(objp: kobj);
543}
544
545static const struct sysfs_ops ext4_attr_ops = {
546 .show = ext4_attr_show,
547 .store = ext4_attr_store,
548};
549
550static const struct kobj_type ext4_sb_ktype = {
551 .default_groups = ext4_groups,
552 .sysfs_ops = &ext4_attr_ops,
553 .release = ext4_sb_release,
554};
555
556static const struct kobj_type ext4_feat_ktype = {
557 .default_groups = ext4_feat_groups,
558 .sysfs_ops = &ext4_attr_ops,
559 .release = ext4_feat_release,
560};
561
562void ext4_notify_error_sysfs(struct ext4_sb_info *sbi)
563{
564 sysfs_notify(kobj: &sbi->s_kobj, NULL, attr: "errors_count");
565}
566
567static struct kobject *ext4_root;
568
569static struct kobject *ext4_feat;
570
571int ext4_register_sysfs(struct super_block *sb)
572{
573 struct ext4_sb_info *sbi = EXT4_SB(sb);
574 int err;
575
576 init_completion(x: &sbi->s_kobj_unregister);
577 err = kobject_init_and_add(kobj: &sbi->s_kobj, ktype: &ext4_sb_ktype, parent: ext4_root,
578 fmt: "%s", sb->s_id);
579 if (err) {
580 kobject_put(kobj: &sbi->s_kobj);
581 wait_for_completion(&sbi->s_kobj_unregister);
582 return err;
583 }
584
585 if (ext4_proc_root)
586 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
587 if (sbi->s_proc) {
588 proc_create_single_data(name: "options", S_IRUGO, parent: sbi->s_proc,
589 show: ext4_seq_options_show, data: sb);
590 proc_create_single_data(name: "es_shrinker_info", S_IRUGO,
591 parent: sbi->s_proc, show: ext4_seq_es_shrinker_info_show,
592 data: sb);
593 proc_create_single_data(name: "fc_info", mode: 0444, parent: sbi->s_proc,
594 show: ext4_fc_info_show, data: sb);
595 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
596 &ext4_mb_seq_groups_ops, sb);
597 proc_create_single_data(name: "mb_stats", mode: 0444, parent: sbi->s_proc,
598 show: ext4_seq_mb_stats_show, data: sb);
599 proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc,
600 &ext4_mb_seq_structs_summary_ops, sb);
601 }
602 return 0;
603}
604
605void ext4_unregister_sysfs(struct super_block *sb)
606{
607 struct ext4_sb_info *sbi = EXT4_SB(sb);
608
609 if (sbi->s_proc)
610 remove_proc_subtree(sb->s_id, ext4_proc_root);
611 kobject_del(kobj: &sbi->s_kobj);
612}
613
614int __init ext4_init_sysfs(void)
615{
616 int ret;
617
618 ext4_root = kobject_create_and_add(name: "ext4", parent: fs_kobj);
619 if (!ext4_root)
620 return -ENOMEM;
621
622 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
623 if (!ext4_feat) {
624 ret = -ENOMEM;
625 goto root_err;
626 }
627
628 ret = kobject_init_and_add(kobj: ext4_feat, ktype: &ext4_feat_ktype,
629 parent: ext4_root, fmt: "features");
630 if (ret)
631 goto feat_err;
632
633 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
634 return ret;
635
636feat_err:
637 kobject_put(kobj: ext4_feat);
638 ext4_feat = NULL;
639root_err:
640 kobject_put(kobj: ext4_root);
641 ext4_root = NULL;
642 return ret;
643}
644
645void ext4_exit_sysfs(void)
646{
647 kobject_put(kobj: ext4_feat);
648 ext4_feat = NULL;
649 kobject_put(kobj: ext4_root);
650 ext4_root = NULL;
651 remove_proc_entry(proc_dirname, NULL);
652 ext4_proc_root = NULL;
653}
654
655

source code of linux/fs/ext4/sysfs.c