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