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