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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 ([email protected])
7 * Theodore Ts'o ([email protected])
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_err_report_sec,
44} attr_id_t;
45
46typedef enum {
47 ptr_explicit,
48 ptr_ext4_sb_info_offset,
49 ptr_ext4_super_block_offset,
50} attr_ptr_t;
51
52static const char proc_dirname[] = "fs/ext4";
53static struct proc_dir_entry *ext4_proc_root;
54
55struct ext4_attr {
56 struct attribute attr;
57 short attr_id;
58 short attr_ptr;
59 unsigned short attr_size;
60 union {
61 int offset;
62 void *explicit_ptr;
63 } u;
64};
65
66static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
67{
68 struct super_block *sb = sbi->s_buddy_cache->i_sb;
69
70 return sysfs_emit(buf, "%lu\n",
71 (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
72 sbi->s_sectors_written_start) >> 1);
73}
74
75static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
76{
77 struct super_block *sb = sbi->s_buddy_cache->i_sb;
78
79 return sysfs_emit(buf, "%llu\n",
80 (unsigned long long)(sbi->s_kbytes_written +
81 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
82 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
83}
84
85static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
86 const char *buf, size_t count)
87{
88 unsigned long t;
89 int ret;
90
91 ret = kstrtoul(skip_spaces(buf), 0, &t);
92 if (ret)
93 return ret;
94
95 if (t && (!is_power_of_2(t) || t > 0x40000000))
96 return -EINVAL;
97
98 sbi->s_inode_readahead_blks = t;
99 return count;
100}
101
102static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
103 const char *buf, size_t count)
104{
105 unsigned long long val;
106 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
107 sbi->s_cluster_bits);
108 int ret;
109
110 ret = kstrtoull(skip_spaces(buf), 0, &val);
111 if (ret || val >= clusters || (s64)val < 0)
112 return -EINVAL;
113
114 atomic64_set(&sbi->s_resv_clusters, val);
115 return count;
116}
117
118static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
119 const char *buf, size_t count)
120{
121 int len = count;
122
123 if (!capable(CAP_SYS_ADMIN))
124 return -EPERM;
125
126 if (len && buf[len-1] == '\n')
127 len--;
128
129 if (len)
130 ext4_error(sbi->s_sb, "%.*s", len, buf);
131 return count;
132}
133
134static ssize_t err_report_sec_store(struct ext4_sb_info *sbi,
135 const char *buf, size_t count)
136{
137 unsigned long t;
138 int ret;
139
140 ret = kstrtoul(skip_spaces(buf), 0, &t);
141 if (ret)
142 return ret;
143
144 /*the maximum time interval must not exceed one year.*/
145 if (t > (365*24*60*60))
146 return -EINVAL;
147
148 if (sbi->s_err_report_sec == t) /*nothing to do*/
149 goto out;
150 else if (!sbi->s_err_report_sec && t) {
151 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
152 } else if (sbi->s_err_report_sec && !t) {
153 timer_delete_sync(&sbi->s_err_report);
154 goto out;
155 }
156
157 sbi->s_err_report_sec = t;
158 mod_timer(&sbi->s_err_report, jiffies + secs_to_jiffies(sbi->s_err_report_sec));
159
160out:
161 return count;
162}
163
164static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
165{
166 if (!sbi->s_journal)
167 return sysfs_emit(buf, "<none>\n");
168 return sysfs_emit(buf, "%d\n",
169 task_pid_vnr(sbi->s_journal->j_task));
170}
171
172#define EXT4_ATTR(_name,_mode,_id) \
173static struct ext4_attr ext4_attr_##_name = { \
174 .attr = {.name = __stringify(_name), .mode = _mode }, \
175 .attr_id = attr_##_id, \
176}
177
178#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
179
180#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
181
182#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
183static struct ext4_attr ext4_attr_##_name = { \
184 .attr = {.name = __stringify(_name), .mode = _mode }, \
185 .attr_id = attr_##_id, \
186 .attr_ptr = ptr_##_struct##_offset, \
187 .u = { \
188 .offset = offsetof(struct _struct, _elname),\
189 }, \
190}
191
192#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \
193static struct ext4_attr ext4_attr_##_name = { \
194 .attr = {.name = __stringify(_name), .mode = _mode }, \
195 .attr_id = attr_pointer_string, \
196 .attr_size = _size, \
197 .attr_ptr = ptr_##_struct##_offset, \
198 .u = { \
199 .offset = offsetof(struct _struct, _elname),\
200 }, \
201}
202
203#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
204 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
205
206#define EXT4_RO_ATTR_ES_U8(_name,_elname) \
207 EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname)
208
209#define EXT4_RO_ATTR_ES_U64(_name,_elname) \
210 EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname)
211
212#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \
213 EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname)
214
215#define EXT4_RW_ATTR_SBI_PI(_name,_elname) \
216 EXT4_ATTR_OFFSET(_name, 0644, pointer_pi, ext4_sb_info, _elname)
217
218#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
219 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
220
221#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \
222 EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)
223
224#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \
225 EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname)
226
227#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
228static struct ext4_attr ext4_attr_##_name = { \
229 .attr = {.name = __stringify(_name), .mode = _mode }, \
230 .attr_id = attr_##_id, \
231 .attr_ptr = ptr_explicit, \
232 .u = { \
233 .explicit_ptr = _ptr, \
234 }, \
235}
236
237#define ATTR_LIST(name) &ext4_attr_##name.attr
238
239EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
240EXT4_ATTR_FUNC(session_write_kbytes, 0444);
241EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
242EXT4_ATTR_FUNC(reserved_clusters, 0644);
243EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444);
244
245EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
246 ext4_sb_info, s_inode_readahead_blks);
247EXT4_ATTR_OFFSET(mb_group_prealloc, 0644, clusters_in_group,
248 ext4_sb_info, s_mb_group_prealloc);
249EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order,
250 ext4_sb_info, s_mb_best_avail_max_trim_order);
251EXT4_ATTR_OFFSET(err_report_sec, 0644, err_report_sec, ext4_sb_info, s_err_report_sec);
252EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
253EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
254EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
255EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
256EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
257EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
258EXT4_RW_ATTR_SBI_UI(mb_max_linear_groups, s_mb_max_linear_groups);
259EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
260EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
261EXT4_RW_ATTR_SBI_PI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
262EXT4_RW_ATTR_SBI_PI(err_ratelimit_burst, s_err_ratelimit_state.burst);
263EXT4_RW_ATTR_SBI_PI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
264EXT4_RW_ATTR_SBI_PI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
265EXT4_RW_ATTR_SBI_PI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
266EXT4_RW_ATTR_SBI_PI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
267#ifdef CONFIG_EXT4_DEBUG
268EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
269#endif
270EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
271EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
272EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
273EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
274EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
275EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
276EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
277EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
278EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
279EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
280EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
281EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
282EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
283EXT4_ATTR(first_error_time, 0444, first_error_time);
284EXT4_ATTR(last_error_time, 0444, last_error_time);
285EXT4_ATTR(journal_task, 0444, journal_task);
286EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
287EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
288EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks);
289EXT4_RW_ATTR_SBI_UI(sb_update_sec, s_sb_update_sec);
290EXT4_RW_ATTR_SBI_UI(sb_update_kb, s_sb_update_kb);
291
292static unsigned int old_bump_val = 128;
293EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
294
295static struct attribute *ext4_attrs[] = {
296 ATTR_LIST(delayed_allocation_blocks),
297 ATTR_LIST(session_write_kbytes),
298 ATTR_LIST(lifetime_write_kbytes),
299 ATTR_LIST(reserved_clusters),
300 ATTR_LIST(sra_exceeded_retry_limit),
301 ATTR_LIST(inode_readahead_blks),
302 ATTR_LIST(inode_goal),
303 ATTR_LIST(mb_stats),
304 ATTR_LIST(mb_max_to_scan),
305 ATTR_LIST(mb_min_to_scan),
306 ATTR_LIST(mb_order2_req),
307 ATTR_LIST(mb_stream_req),
308 ATTR_LIST(mb_group_prealloc),
309 ATTR_LIST(mb_max_linear_groups),
310 ATTR_LIST(max_writeback_mb_bump),
311 ATTR_LIST(extent_max_zeroout_kb),
312 ATTR_LIST(trigger_fs_error),
313 ATTR_LIST(err_ratelimit_interval_ms),
314 ATTR_LIST(err_ratelimit_burst),
315 ATTR_LIST(warning_ratelimit_interval_ms),
316 ATTR_LIST(warning_ratelimit_burst),
317 ATTR_LIST(msg_ratelimit_interval_ms),
318 ATTR_LIST(msg_ratelimit_burst),
319 ATTR_LIST(mb_best_avail_max_trim_order),
320 ATTR_LIST(errors_count),
321 ATTR_LIST(warning_count),
322 ATTR_LIST(msg_count),
323 ATTR_LIST(first_error_ino),
324 ATTR_LIST(last_error_ino),
325 ATTR_LIST(first_error_block),
326 ATTR_LIST(last_error_block),
327 ATTR_LIST(first_error_line),
328 ATTR_LIST(last_error_line),
329 ATTR_LIST(first_error_func),
330 ATTR_LIST(last_error_func),
331 ATTR_LIST(first_error_errcode),
332 ATTR_LIST(last_error_errcode),
333 ATTR_LIST(first_error_time),
334 ATTR_LIST(last_error_time),
335 ATTR_LIST(journal_task),
336#ifdef CONFIG_EXT4_DEBUG
337 ATTR_LIST(simulate_fail),
338#endif
339 ATTR_LIST(mb_prefetch),
340 ATTR_LIST(mb_prefetch_limit),
341 ATTR_LIST(last_trim_minblks),
342 ATTR_LIST(sb_update_sec),
343 ATTR_LIST(sb_update_kb),
344 ATTR_LIST(err_report_sec),
345 NULL,
346};
347ATTRIBUTE_GROUPS(ext4);
348
349/* Features this copy of ext4 supports */
350EXT4_ATTR_FEATURE(lazy_itable_init);
351EXT4_ATTR_FEATURE(batched_discard);
352EXT4_ATTR_FEATURE(meta_bg_resize);
353#ifdef CONFIG_FS_ENCRYPTION
354EXT4_ATTR_FEATURE(encryption);
355EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
356#endif
357#if IS_ENABLED(CONFIG_UNICODE)
358EXT4_ATTR_FEATURE(casefold);
359#endif
360#ifdef CONFIG_FS_VERITY
361EXT4_ATTR_FEATURE(verity);
362#endif
363EXT4_ATTR_FEATURE(metadata_csum_seed);
364EXT4_ATTR_FEATURE(fast_commit);
365#if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION)
366EXT4_ATTR_FEATURE(encrypted_casefold);
367#endif
368#ifdef CONFIG_TRANSPARENT_HUGEPAGE
369EXT4_ATTR_FEATURE(blocksize_gt_pagesize);
370#endif
371
372static struct attribute *ext4_feat_attrs[] = {
373 ATTR_LIST(lazy_itable_init),
374 ATTR_LIST(batched_discard),
375 ATTR_LIST(meta_bg_resize),
376#ifdef CONFIG_FS_ENCRYPTION
377 ATTR_LIST(encryption),
378 ATTR_LIST(test_dummy_encryption_v2),
379#endif
380#if IS_ENABLED(CONFIG_UNICODE)
381 ATTR_LIST(casefold),
382#endif
383#ifdef CONFIG_FS_VERITY
384 ATTR_LIST(verity),
385#endif
386 ATTR_LIST(metadata_csum_seed),
387 ATTR_LIST(fast_commit),
388#if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION)
389 ATTR_LIST(encrypted_casefold),
390#endif
391#ifdef CONFIG_TRANSPARENT_HUGEPAGE
392 ATTR_LIST(blocksize_gt_pagesize),
393#endif
394 NULL,
395};
396ATTRIBUTE_GROUPS(ext4_feat);
397
398static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
399{
400 switch (a->attr_ptr) {
401 case ptr_explicit:
402 return a->u.explicit_ptr;
403 case ptr_ext4_sb_info_offset:
404 return (void *) (((char *) sbi) + a->u.offset);
405 case ptr_ext4_super_block_offset:
406 return (void *) (((char *) sbi->s_es) + a->u.offset);
407 }
408 return NULL;
409}
410
411static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
412{
413 return sysfs_emit(buf, "%lld\n",
414 ((time64_t)hi << 32) + le32_to_cpu(lo));
415}
416
417#define print_tstamp(buf, es, tstamp) \
418 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
419
420static ssize_t ext4_generic_attr_show(struct ext4_attr *a,
421 struct ext4_sb_info *sbi, char *buf)
422{
423 void *ptr = calc_ptr(a, sbi);
424
425 if (!ptr)
426 return 0;
427
428 switch (a->attr_id) {
429 case attr_inode_readahead:
430 case attr_clusters_in_group:
431 case attr_mb_order:
432 case attr_pointer_pi:
433 case attr_pointer_ui:
434 if (a->attr_ptr == ptr_ext4_super_block_offset)
435 return sysfs_emit(buf, "%u\n", le32_to_cpup(ptr));
436 return sysfs_emit(buf, "%u\n", *((unsigned int *) ptr));
437 case attr_pointer_ul:
438 case attr_err_report_sec:
439 return sysfs_emit(buf, "%lu\n", *((unsigned long *) ptr));
440 case attr_pointer_u8:
441 return sysfs_emit(buf, "%u\n", *((unsigned char *) ptr));
442 case attr_pointer_u64:
443 if (a->attr_ptr == ptr_ext4_super_block_offset)
444 return sysfs_emit(buf, "%llu\n", le64_to_cpup(ptr));
445 return sysfs_emit(buf, "%llu\n", *((unsigned long long *) ptr));
446 case attr_pointer_string:
447 return sysfs_emit(buf, "%.*s\n", a->attr_size, (char *) ptr);
448 case attr_pointer_atomic:
449 return sysfs_emit(buf, "%d\n", atomic_read((atomic_t *) ptr));
450 }
451 return 0;
452}
453
454static ssize_t ext4_attr_show(struct kobject *kobj,
455 struct attribute *attr, char *buf)
456{
457 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
458 s_kobj);
459 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
460
461 switch (a->attr_id) {
462 case attr_delayed_allocation_blocks:
463 return sysfs_emit(buf, "%llu\n",
464 (s64) EXT4_C2B(sbi,
465 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
466 case attr_session_write_kbytes:
467 return session_write_kbytes_show(sbi, buf);
468 case attr_lifetime_write_kbytes:
469 return lifetime_write_kbytes_show(sbi, buf);
470 case attr_reserved_clusters:
471 return sysfs_emit(buf, "%llu\n",
472 (unsigned long long)
473 atomic64_read(&sbi->s_resv_clusters));
474 case attr_sra_exceeded_retry_limit:
475 return sysfs_emit(buf, "%llu\n",
476 (unsigned long long)
477 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
478 case attr_feature:
479 return sysfs_emit(buf, "supported\n");
480 case attr_first_error_time:
481 return print_tstamp(buf, sbi->s_es, s_first_error_time);
482 case attr_last_error_time:
483 return print_tstamp(buf, sbi->s_es, s_last_error_time);
484 case attr_journal_task:
485 return journal_task_show(sbi, buf);
486 default:
487 return ext4_generic_attr_show(a, sbi, buf);
488 }
489}
490
491static ssize_t ext4_generic_attr_store(struct ext4_attr *a,
492 struct ext4_sb_info *sbi,
493 const char *buf, size_t len)
494{
495 int ret;
496 unsigned int t;
497 unsigned long lt;
498 void *ptr = calc_ptr(a, sbi);
499
500 if (!ptr)
501 return 0;
502
503 switch (a->attr_id) {
504 case attr_pointer_pi:
505 ret = kstrtouint(skip_spaces(buf), 0, &t);
506 if (ret)
507 return ret;
508 if ((int)t < 0)
509 return -EINVAL;
510 *((unsigned int *) ptr) = t;
511 return len;
512 case attr_pointer_ui:
513 ret = kstrtouint(skip_spaces(buf), 0, &t);
514 if (ret)
515 return ret;
516 if (a->attr_ptr == ptr_ext4_super_block_offset)
517 *((__le32 *) ptr) = cpu_to_le32(t);
518 else
519 *((unsigned int *) ptr) = t;
520 return len;
521 case attr_mb_order:
522 ret = kstrtouint(skip_spaces(buf), 0, &t);
523 if (ret)
524 return ret;
525 if (t > 64)
526 return -EINVAL;
527 *((unsigned int *) ptr) = t;
528 return len;
529 case attr_clusters_in_group:
530 ret = kstrtouint(skip_spaces(buf), 0, &t);
531 if (ret)
532 return ret;
533 if (t > sbi->s_clusters_per_group)
534 return -EINVAL;
535 *((unsigned int *) ptr) = t;
536 return len;
537 case attr_pointer_ul:
538 ret = kstrtoul(skip_spaces(buf), 0, &lt);
539 if (ret)
540 return ret;
541 *((unsigned long *) ptr) = lt;
542 return len;
543 }
544 return 0;
545}
546
547static ssize_t ext4_attr_store(struct kobject *kobj,
548 struct attribute *attr,
549 const char *buf, size_t len)
550{
551 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
552 s_kobj);
553 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
554
555 switch (a->attr_id) {
556 case attr_reserved_clusters:
557 return reserved_clusters_store(sbi, buf, len);
558 case attr_inode_readahead:
559 return inode_readahead_blks_store(sbi, buf, len);
560 case attr_trigger_test_error:
561 return trigger_test_error(sbi, buf, len);
562 case attr_err_report_sec:
563 return err_report_sec_store(sbi, buf, len);
564 default:
565 return ext4_generic_attr_store(a, sbi, buf, len);
566 }
567}
568
569static void ext4_sb_release(struct kobject *kobj)
570{
571 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
572 s_kobj);
573 complete(&sbi->s_kobj_unregister);
574}
575
576static void ext4_feat_release(struct kobject *kobj)
577{
578 kfree(kobj);
579}
580
581static const struct sysfs_ops ext4_attr_ops = {
582 .show = ext4_attr_show,
583 .store = ext4_attr_store,
584};
585
586static const struct kobj_type ext4_sb_ktype = {
587 .default_groups = ext4_groups,
588 .sysfs_ops = &ext4_attr_ops,
589 .release = ext4_sb_release,
590};
591
592static const struct kobj_type ext4_feat_ktype = {
593 .default_groups = ext4_feat_groups,
594 .sysfs_ops = &ext4_attr_ops,
595 .release = ext4_feat_release,
596};
597
598void ext4_notify_error_sysfs(struct ext4_sb_info *sbi)
599{
600 mutex_lock(&sbi->s_error_notify_mutex);
601 if (sbi->s_kobj.state_in_sysfs)
602 sysfs_notify(&sbi->s_kobj, NULL, "errors_count");
603 mutex_unlock(&sbi->s_error_notify_mutex);
604}
605
606static struct kobject *ext4_root;
607
608static struct kobject *ext4_feat;
609
610int ext4_register_sysfs(struct super_block *sb)
611{
612 struct ext4_sb_info *sbi = EXT4_SB(sb);
613 int err;
614
615 init_completion(&sbi->s_kobj_unregister);
616 mutex_lock(&sbi->s_error_notify_mutex);
617 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
618 "%s", sb->s_id);
619 mutex_unlock(&sbi->s_error_notify_mutex);
620 if (err) {
621 kobject_put(&sbi->s_kobj);
622 wait_for_completion(&sbi->s_kobj_unregister);
623 return err;
624 }
625
626 if (ext4_proc_root)
627 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
628 if (sbi->s_proc) {
629 proc_create_single_data("options", S_IRUGO, sbi->s_proc,
630 ext4_seq_options_show, sb);
631 proc_create_single_data("es_shrinker_info", S_IRUGO,
632 sbi->s_proc, ext4_seq_es_shrinker_info_show,
633 sb);
634 proc_create_single_data("fc_info", 0444, sbi->s_proc,
635 ext4_fc_info_show, sb);
636 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
637 &ext4_mb_seq_groups_ops, sb);
638 proc_create_single_data("mb_stats", 0444, sbi->s_proc,
639 ext4_seq_mb_stats_show, sb);
640 proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc,
641 &ext4_mb_seq_structs_summary_ops, sb);
642 }
643 return 0;
644}
645
646void ext4_unregister_sysfs(struct super_block *sb)
647{
648 struct ext4_sb_info *sbi = EXT4_SB(sb);
649
650 if (sbi->s_proc)
651 remove_proc_subtree(sb->s_id, ext4_proc_root);
652
653 mutex_lock(&sbi->s_error_notify_mutex);
654 kobject_del(&sbi->s_kobj);
655 mutex_unlock(&sbi->s_error_notify_mutex);
656}
657
658int __init ext4_init_sysfs(void)
659{
660 int ret;
661
662 ext4_root = kobject_create_and_add("ext4", fs_kobj);
663 if (!ext4_root)
664 return -ENOMEM;
665
666 ext4_feat = kzalloc_obj(*ext4_feat);
667 if (!ext4_feat) {
668 ret = -ENOMEM;
669 goto root_err;
670 }
671
672 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
673 ext4_root, "features");
674 if (ret)
675 goto feat_err;
676
677 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
678 return ret;
679
680feat_err:
681 kobject_put(ext4_feat);
682 ext4_feat = NULL;
683root_err:
684 kobject_put(ext4_root);
685 ext4_root = NULL;
686 return ret;
687}
688
689void ext4_exit_sysfs(void)
690{
691 kobject_put(ext4_feat);
692 ext4_feat = NULL;
693 kobject_put(ext4_root);
694 ext4_root = NULL;
695 remove_proc_entry(proc_dirname, NULL);
696 ext4_proc_root = NULL;
697}
698