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 | static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) |
63 | { |
64 | struct super_block *sb = sbi->s_buddy_cache->i_sb; |
65 | |
66 | return sysfs_emit(buf, fmt: "%lu\n" , |
67 | (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - |
68 | sbi->s_sectors_written_start) >> 1); |
69 | } |
70 | |
71 | static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) |
72 | { |
73 | struct super_block *sb = sbi->s_buddy_cache->i_sb; |
74 | |
75 | return sysfs_emit(buf, fmt: "%llu\n" , |
76 | (unsigned long long)(sbi->s_kbytes_written + |
77 | ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - |
78 | EXT4_SB(sb)->s_sectors_written_start) >> 1))); |
79 | } |
80 | |
81 | static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, |
82 | const char *buf, size_t count) |
83 | { |
84 | unsigned long t; |
85 | int ret; |
86 | |
87 | ret = kstrtoul(s: skip_spaces(buf), base: 0, res: &t); |
88 | if (ret) |
89 | return ret; |
90 | |
91 | if (t && (!is_power_of_2(n: t) || t > 0x40000000)) |
92 | return -EINVAL; |
93 | |
94 | sbi->s_inode_readahead_blks = t; |
95 | return count; |
96 | } |
97 | |
98 | static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, |
99 | const char *buf, size_t count) |
100 | { |
101 | unsigned long long val; |
102 | ext4_fsblk_t clusters = (ext4_blocks_count(es: sbi->s_es) >> |
103 | sbi->s_cluster_bits); |
104 | int ret; |
105 | |
106 | ret = kstrtoull(s: skip_spaces(buf), base: 0, res: &val); |
107 | if (ret || val >= clusters) |
108 | return -EINVAL; |
109 | |
110 | atomic64_set(v: &sbi->s_resv_clusters, i: val); |
111 | return count; |
112 | } |
113 | |
114 | static ssize_t trigger_test_error(struct ext4_sb_info *sbi, |
115 | const char *buf, size_t count) |
116 | { |
117 | int len = count; |
118 | |
119 | if (!capable(CAP_SYS_ADMIN)) |
120 | return -EPERM; |
121 | |
122 | if (len && buf[len-1] == '\n') |
123 | len--; |
124 | |
125 | if (len) |
126 | ext4_error(sbi->s_sb, "%.*s" , len, buf); |
127 | return count; |
128 | } |
129 | |
130 | static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) |
131 | { |
132 | if (!sbi->s_journal) |
133 | return sysfs_emit(buf, fmt: "<none>\n" ); |
134 | return sysfs_emit(buf, fmt: "%d\n" , |
135 | task_pid_vnr(tsk: 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 | static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) |
348 | { |
349 | switch (a->attr_ptr) { |
350 | case ptr_explicit: |
351 | return a->u.explicit_ptr; |
352 | case ptr_ext4_sb_info_offset: |
353 | return (void *) (((char *) sbi) + a->u.offset); |
354 | case ptr_ext4_super_block_offset: |
355 | 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 | return sysfs_emit(buf, fmt: "%lld\n" , |
363 | ((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 | static ssize_t ext4_attr_show(struct kobject *kobj, |
370 | struct attribute *attr, char *buf) |
371 | { |
372 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
373 | s_kobj); |
374 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); |
375 | void *ptr = calc_ptr(a, sbi); |
376 | |
377 | switch (a->attr_id) { |
378 | case attr_delayed_allocation_blocks: |
379 | return sysfs_emit(buf, fmt: "%llu\n" , |
380 | (s64) EXT4_C2B(sbi, |
381 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); |
382 | case attr_session_write_kbytes: |
383 | return session_write_kbytes_show(sbi, buf); |
384 | case attr_lifetime_write_kbytes: |
385 | return lifetime_write_kbytes_show(sbi, buf); |
386 | case attr_reserved_clusters: |
387 | return sysfs_emit(buf, fmt: "%llu\n" , |
388 | (unsigned long long) |
389 | atomic64_read(v: &sbi->s_resv_clusters)); |
390 | case attr_sra_exceeded_retry_limit: |
391 | return sysfs_emit(buf, fmt: "%llu\n" , |
392 | (unsigned long long) |
393 | percpu_counter_sum(fbc: &sbi->s_sra_exceeded_retry_limit)); |
394 | case attr_inode_readahead: |
395 | case attr_pointer_ui: |
396 | if (!ptr) |
397 | return 0; |
398 | if (a->attr_ptr == ptr_ext4_super_block_offset) |
399 | return sysfs_emit(buf, fmt: "%u\n" , |
400 | le32_to_cpup(p: ptr)); |
401 | else |
402 | return sysfs_emit(buf, fmt: "%u\n" , |
403 | *((unsigned int *) ptr)); |
404 | case attr_pointer_ul: |
405 | if (!ptr) |
406 | return 0; |
407 | return sysfs_emit(buf, fmt: "%lu\n" , |
408 | *((unsigned long *) ptr)); |
409 | case attr_pointer_u8: |
410 | if (!ptr) |
411 | return 0; |
412 | return sysfs_emit(buf, fmt: "%u\n" , |
413 | *((unsigned char *) ptr)); |
414 | case attr_pointer_u64: |
415 | if (!ptr) |
416 | return 0; |
417 | if (a->attr_ptr == ptr_ext4_super_block_offset) |
418 | return sysfs_emit(buf, fmt: "%llu\n" , |
419 | le64_to_cpup(p: ptr)); |
420 | else |
421 | return sysfs_emit(buf, fmt: "%llu\n" , |
422 | *((unsigned long long *) ptr)); |
423 | case attr_pointer_string: |
424 | if (!ptr) |
425 | return 0; |
426 | return sysfs_emit(buf, fmt: "%.*s\n" , a->attr_size, |
427 | (char *) ptr); |
428 | case attr_pointer_atomic: |
429 | if (!ptr) |
430 | return 0; |
431 | return sysfs_emit(buf, fmt: "%d\n" , |
432 | atomic_read(v: (atomic_t *) ptr)); |
433 | case attr_feature: |
434 | return sysfs_emit(buf, fmt: "supported\n" ); |
435 | case attr_first_error_time: |
436 | return print_tstamp(buf, sbi->s_es, s_first_error_time); |
437 | case attr_last_error_time: |
438 | return print_tstamp(buf, sbi->s_es, s_last_error_time); |
439 | case attr_journal_task: |
440 | return journal_task_show(sbi, buf); |
441 | } |
442 | |
443 | return 0; |
444 | } |
445 | |
446 | static ssize_t ext4_attr_store(struct kobject *kobj, |
447 | struct attribute *attr, |
448 | const char *buf, size_t len) |
449 | { |
450 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
451 | s_kobj); |
452 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); |
453 | void *ptr = calc_ptr(a, sbi); |
454 | unsigned long t; |
455 | int ret; |
456 | |
457 | switch (a->attr_id) { |
458 | case attr_reserved_clusters: |
459 | return reserved_clusters_store(sbi, buf, count: len); |
460 | case attr_pointer_ui: |
461 | if (!ptr) |
462 | return 0; |
463 | ret = kstrtoul(s: skip_spaces(buf), base: 0, res: &t); |
464 | if (ret) |
465 | return ret; |
466 | if (a->attr_ptr == ptr_ext4_super_block_offset) |
467 | *((__le32 *) ptr) = cpu_to_le32(t); |
468 | else |
469 | *((unsigned int *) ptr) = t; |
470 | return len; |
471 | case attr_pointer_ul: |
472 | if (!ptr) |
473 | return 0; |
474 | ret = kstrtoul(s: skip_spaces(buf), base: 0, res: &t); |
475 | if (ret) |
476 | return ret; |
477 | *((unsigned long *) ptr) = t; |
478 | return len; |
479 | case attr_inode_readahead: |
480 | return inode_readahead_blks_store(sbi, buf, count: len); |
481 | case attr_trigger_test_error: |
482 | return trigger_test_error(sbi, buf, count: len); |
483 | } |
484 | return 0; |
485 | } |
486 | |
487 | static void ext4_sb_release(struct kobject *kobj) |
488 | { |
489 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
490 | s_kobj); |
491 | complete(&sbi->s_kobj_unregister); |
492 | } |
493 | |
494 | static void ext4_feat_release(struct kobject *kobj) |
495 | { |
496 | kfree(objp: kobj); |
497 | } |
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 | void ext4_notify_error_sysfs(struct ext4_sb_info *sbi) |
517 | { |
518 | sysfs_notify(kobj: &sbi->s_kobj, NULL, attr: "errors_count" ); |
519 | } |
520 | |
521 | static struct kobject *ext4_root; |
522 | |
523 | static struct kobject *ext4_feat; |
524 | |
525 | int ext4_register_sysfs(struct super_block *sb) |
526 | { |
527 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
528 | int err; |
529 | |
530 | init_completion(x: &sbi->s_kobj_unregister); |
531 | err = kobject_init_and_add(kobj: &sbi->s_kobj, ktype: &ext4_sb_ktype, parent: ext4_root, |
532 | fmt: "%s" , sb->s_id); |
533 | if (err) { |
534 | kobject_put(kobj: &sbi->s_kobj); |
535 | wait_for_completion(&sbi->s_kobj_unregister); |
536 | return err; |
537 | } |
538 | |
539 | if (ext4_proc_root) |
540 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); |
541 | if (sbi->s_proc) { |
542 | proc_create_single_data(name: "options" , S_IRUGO, parent: sbi->s_proc, |
543 | show: ext4_seq_options_show, data: sb); |
544 | proc_create_single_data(name: "es_shrinker_info" , S_IRUGO, |
545 | parent: sbi->s_proc, show: ext4_seq_es_shrinker_info_show, |
546 | data: sb); |
547 | proc_create_single_data(name: "fc_info" , mode: 0444, parent: sbi->s_proc, |
548 | show: ext4_fc_info_show, data: sb); |
549 | proc_create_seq_data("mb_groups" , S_IRUGO, sbi->s_proc, |
550 | &ext4_mb_seq_groups_ops, sb); |
551 | proc_create_single_data(name: "mb_stats" , mode: 0444, parent: sbi->s_proc, |
552 | show: ext4_seq_mb_stats_show, data: sb); |
553 | 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 | void ext4_unregister_sysfs(struct super_block *sb) |
560 | { |
561 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
562 | |
563 | if (sbi->s_proc) |
564 | remove_proc_subtree(sb->s_id, ext4_proc_root); |
565 | kobject_del(kobj: &sbi->s_kobj); |
566 | } |
567 | |
568 | int __init ext4_init_sysfs(void) |
569 | { |
570 | int ret; |
571 | |
572 | ext4_root = kobject_create_and_add(name: "ext4" , parent: fs_kobj); |
573 | if (!ext4_root) |
574 | return -ENOMEM; |
575 | |
576 | ext4_feat = kzalloc(size: sizeof(*ext4_feat), GFP_KERNEL); |
577 | if (!ext4_feat) { |
578 | ret = -ENOMEM; |
579 | goto root_err; |
580 | } |
581 | |
582 | ret = kobject_init_and_add(kobj: ext4_feat, ktype: &ext4_feat_ktype, |
583 | parent: ext4_root, fmt: "features" ); |
584 | if (ret) |
585 | goto feat_err; |
586 | |
587 | ext4_proc_root = proc_mkdir(proc_dirname, NULL); |
588 | return ret; |
589 | |
590 | feat_err: |
591 | kobject_put(kobj: ext4_feat); |
592 | ext4_feat = NULL; |
593 | root_err: |
594 | kobject_put(kobj: ext4_root); |
595 | ext4_root = NULL; |
596 | return ret; |
597 | } |
598 | |
599 | void ext4_exit_sysfs(void) |
600 | { |
601 | kobject_put(kobj: ext4_feat); |
602 | ext4_feat = NULL; |
603 | kobject_put(kobj: ext4_root); |
604 | ext4_root = NULL; |
605 | remove_proc_entry(proc_dirname, NULL); |
606 | ext4_proc_root = NULL; |
607 | } |
608 | |
609 | |