sysfs.c

  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, "%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, "%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(skip_spaces(buf), 0, &t);
 91	if (ret)
 92		return ret;
 93
 94	if (t && (!is_power_of_2(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(sbi->s_es) >>
106				 sbi->s_cluster_bits);
107	int ret;
108
109	ret = kstrtoull(skip_spaces(buf), 0, &val);
110	if (ret || val >= clusters || (s64)val < 0)
111		return -EINVAL;
112
113	atomic64_set(&sbi->s_resv_clusters, 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, "<none>\n");
137	return sysfs_emit(buf, "%d\n",
138			task_pid_vnr(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, "%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, "%u\n", le32_to_cpup(ptr));
403		return sysfs_emit(buf, "%u\n", *((unsigned int *) ptr));
404	case attr_pointer_ul:
405		return sysfs_emit(buf, "%lu\n", *((unsigned long *) ptr));
406	case attr_pointer_u8:
407		return sysfs_emit(buf, "%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, "%llu\n", le64_to_cpup(ptr));
411		return sysfs_emit(buf, "%llu\n", *((unsigned long long *) ptr));
412	case attr_pointer_string:
413		return sysfs_emit(buf, "%.*s\n", a->attr_size, (char *) ptr);
414	case attr_pointer_atomic:
415		return sysfs_emit(buf, "%d\n", atomic_read((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, "%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, "%llu\n",
438				(unsigned long long)
439				atomic64_read(&sbi->s_resv_clusters));
440	case attr_sra_exceeded_retry_limit:
441		return sysfs_emit(buf, "%llu\n",
442				(unsigned long long)
443			percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
444	case attr_feature:
445		return sysfs_emit(buf, "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(skip_spaces(buf), 0, &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(skip_spaces(buf), 0, &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(skip_spaces(buf), 0, &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(skip_spaces(buf), 0, &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(skip_spaces(buf), 0, &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, len);
524	case attr_inode_readahead:
525		return inode_readahead_blks_store(sbi, buf, len);
526	case attr_trigger_test_error:
527		return trigger_test_error(sbi, buf, 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(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	mutex_lock(&sbi->s_error_notify_mutex);
565	if (sbi->s_kobj.state_in_sysfs)
566		sysfs_notify(&sbi->s_kobj, NULL, "errors_count");
567	mutex_unlock(&sbi->s_error_notify_mutex);
568}
569
570static struct kobject *ext4_root;
571
572static struct kobject *ext4_feat;
573
574int ext4_register_sysfs(struct super_block *sb)
575{
576	struct ext4_sb_info *sbi = EXT4_SB(sb);
577	int err;
578
579	init_completion(&sbi->s_kobj_unregister);
580	mutex_lock(&sbi->s_error_notify_mutex);
581	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
582				   "%s", sb->s_id);
583	mutex_unlock(&sbi->s_error_notify_mutex);
584	if (err) {
585		kobject_put(&sbi->s_kobj);
586		wait_for_completion(&sbi->s_kobj_unregister);
587		return err;
588	}
589
590	if (ext4_proc_root)
591		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
592	if (sbi->s_proc) {
593		proc_create_single_data("options", S_IRUGO, sbi->s_proc,
594				ext4_seq_options_show, sb);
595		proc_create_single_data("es_shrinker_info", S_IRUGO,
596				sbi->s_proc, ext4_seq_es_shrinker_info_show,
597				sb);
598		proc_create_single_data("fc_info", 0444, sbi->s_proc,
599					ext4_fc_info_show, sb);
600		proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
601				&ext4_mb_seq_groups_ops, sb);
602		proc_create_single_data("mb_stats", 0444, sbi->s_proc,
603				ext4_seq_mb_stats_show, sb);
604		proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc,
605				&ext4_mb_seq_structs_summary_ops, sb);
606	}
607	return 0;
608}
609
610void ext4_unregister_sysfs(struct super_block *sb)
611{
612	struct ext4_sb_info *sbi = EXT4_SB(sb);
613
614	if (sbi->s_proc)
615		remove_proc_subtree(sb->s_id, ext4_proc_root);
616
617	mutex_lock(&sbi->s_error_notify_mutex);
618	kobject_del(&sbi->s_kobj);
619	mutex_unlock(&sbi->s_error_notify_mutex);
620}
621
622int __init ext4_init_sysfs(void)
623{
624	int ret;
625
626	ext4_root = kobject_create_and_add("ext4", fs_kobj);
627	if (!ext4_root)
628		return -ENOMEM;
629
630	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
631	if (!ext4_feat) {
632		ret = -ENOMEM;
633		goto root_err;
634	}
635
636	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
637				   ext4_root, "features");
638	if (ret)
639		goto feat_err;
640
641	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
642	return ret;
643
644feat_err:
645	kobject_put(ext4_feat);
646	ext4_feat = NULL;
647root_err:
648	kobject_put(ext4_root);
649	ext4_root = NULL;
650	return ret;
651}
652
653void ext4_exit_sysfs(void)
654{
655	kobject_put(ext4_feat);
656	ext4_feat = NULL;
657	kobject_put(ext4_root);
658	ext4_root = NULL;
659	remove_proc_entry(proc_dirname, NULL);
660	ext4_proc_root = NULL;
661}
662