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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b5799018 TT |
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> | |
b99fee58 | 14 | #include <linux/slab.h> |
b5799018 | 15 | #include <linux/proc_fs.h> |
c6a564ff | 16 | #include <linux/part_stat.h> |
b5799018 TT |
17 | |
18 | #include "ext4.h" | |
19 | #include "ext4_jbd2.h" | |
20 | ||
76d33bca TT |
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, | |
efc61345 | 27 | attr_sra_exceeded_retry_limit, |
76d33bca TT |
28 | attr_inode_readahead, |
29 | attr_trigger_test_error, | |
6a0678a7 AB |
30 | attr_first_error_time, |
31 | attr_last_error_time, | |
76d33bca TT |
32 | attr_feature, |
33 | attr_pointer_ui, | |
46f870d6 | 34 | attr_pointer_ul, |
4549b49f TT |
35 | attr_pointer_u64, |
36 | attr_pointer_u8, | |
37 | attr_pointer_string, | |
76d33bca | 38 | attr_pointer_atomic, |
bc1d69d6 | 39 | attr_journal_task, |
76d33bca TT |
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 | ||
d6006186 | 48 | static const char proc_dirname[] = "fs/ext4"; |
ebd173be TT |
49 | static struct proc_dir_entry *ext4_proc_root; |
50 | ||
b5799018 TT |
51 | struct ext4_attr { |
52 | struct attribute attr; | |
76d33bca TT |
53 | short attr_id; |
54 | short attr_ptr; | |
4549b49f | 55 | unsigned short attr_size; |
b5799018 TT |
56 | union { |
57 | int offset; | |
76d33bca | 58 | void *explicit_ptr; |
b5799018 TT |
59 | } u; |
60 | }; | |
61 | ||
6ca06829 | 62 | static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) |
b5799018 TT |
63 | { |
64 | struct super_block *sb = sbi->s_buddy_cache->i_sb; | |
65 | ||
dfac1a16 | 66 | return sysfs_emit(buf, "%lu\n", |
8446fe92 | 67 | (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - |
b5799018 TT |
68 | sbi->s_sectors_written_start) >> 1); |
69 | } | |
70 | ||
6ca06829 | 71 | static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) |
b5799018 TT |
72 | { |
73 | struct super_block *sb = sbi->s_buddy_cache->i_sb; | |
74 | ||
dfac1a16 | 75 | return sysfs_emit(buf, "%llu\n", |
b5799018 | 76 | (unsigned long long)(sbi->s_kbytes_written + |
8446fe92 | 77 | ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - |
b5799018 TT |
78 | EXT4_SB(sb)->s_sectors_written_start) >> 1))); |
79 | } | |
80 | ||
6ca06829 | 81 | static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi, |
b5799018 TT |
82 | const char *buf, size_t count) |
83 | { | |
84 | unsigned long t; | |
85 | int ret; | |
86 | ||
87 | ret = kstrtoul(skip_spaces(buf), 0, &t); | |
88 | if (ret) | |
89 | return ret; | |
90 | ||
91 | if (t && (!is_power_of_2(t) || t > 0x40000000)) | |
92 | return -EINVAL; | |
93 | ||
94 | sbi->s_inode_readahead_blks = t; | |
95 | return count; | |
96 | } | |
97 | ||
6ca06829 | 98 | static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi, |
b5799018 TT |
99 | const char *buf, size_t count) |
100 | { | |
101 | unsigned long long val; | |
102 | ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> | |
103 | sbi->s_cluster_bits); | |
76d33bca | 104 | int ret; |
b5799018 | 105 | |
76d33bca | 106 | ret = kstrtoull(skip_spaces(buf), 0, &val); |
1ea1516f | 107 | if (ret || val >= clusters) |
b5799018 TT |
108 | return -EINVAL; |
109 | ||
110 | atomic64_set(&sbi->s_resv_clusters, val); | |
111 | return count; | |
112 | } | |
113 | ||
6ca06829 | 114 | static ssize_t trigger_test_error(struct ext4_sb_info *sbi, |
b5799018 TT |
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 | ||
bc1d69d6 KK |
130 | static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) |
131 | { | |
132 | if (!sbi->s_journal) | |
dfac1a16 QW |
133 | return sysfs_emit(buf, "<none>\n"); |
134 | return sysfs_emit(buf, "%d\n", | |
bc1d69d6 KK |
135 | task_pid_vnr(sbi->s_journal->j_task)); |
136 | } | |
137 | ||
76d33bca TT |
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, \ | |
b5799018 TT |
142 | } |
143 | ||
76d33bca TT |
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) \ | |
b5799018 TT |
149 | static struct ext4_attr ext4_attr_##_name = { \ |
150 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
76d33bca TT |
151 | .attr_id = attr_##_id, \ |
152 | .attr_ptr = ptr_##_struct##_offset, \ | |
b5799018 | 153 | .u = { \ |
76d33bca | 154 | .offset = offsetof(struct _struct, _elname),\ |
b5799018 TT |
155 | }, \ |
156 | } | |
157 | ||
4549b49f TT |
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 | ||
76d33bca TT |
169 | #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ |
170 | EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) | |
b5799018 | 171 | |
4549b49f TT |
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 | ||
76d33bca TT |
181 | #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ |
182 | EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) | |
b5799018 | 183 | |
46f870d6 TT |
184 | #define EXT4_RW_ATTR_SBI_UL(_name,_elname) \ |
185 | EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname) | |
186 | ||
1cf006ed DM |
187 | #define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \ |
188 | EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname) | |
189 | ||
76d33bca | 190 | #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ |
b5799018 | 191 | static struct ext4_attr ext4_attr_##_name = { \ |
76d33bca TT |
192 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
193 | .attr_id = attr_##_id, \ | |
194 | .attr_ptr = ptr_explicit, \ | |
b5799018 | 195 | .u = { \ |
76d33bca | 196 | .explicit_ptr = _ptr, \ |
b5799018 TT |
197 | }, \ |
198 | } | |
199 | ||
76d33bca TT |
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); | |
efc61345 | 206 | EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444); |
76d33bca TT |
207 | |
208 | EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, | |
209 | ext4_sb_info, s_inode_readahead_blks); | |
b5799018 TT |
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); | |
27bc446e | 217 | EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc); |
196e402a | 218 | EXT4_RW_ATTR_SBI_UI(mb_max_linear_groups, s_mb_max_linear_groups); |
b5799018 | 219 | EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); |
76d33bca | 220 | EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); |
b5799018 TT |
221 | EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); |
222 | EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); | |
223 | EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); | |
224 | EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); | |
225 | EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); | |
226 | EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); | |
46f870d6 TT |
227 | #ifdef CONFIG_EXT4_DEBUG |
228 | EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail); | |
229 | #endif | |
1cf006ed DM |
230 | EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count); |
231 | EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count); | |
b5799018 | 232 | EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); |
4549b49f TT |
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); | |
6a0678a7 AB |
243 | EXT4_ATTR(first_error_time, 0444, first_error_time); |
244 | EXT4_ATTR(last_error_time, 0444, last_error_time); | |
bc1d69d6 | 245 | EXT4_ATTR(journal_task, 0444, journal_task); |
cfd73237 AZ |
246 | EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch); |
247 | EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit); | |
4a69aecb | 248 | EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks); |
b5799018 | 249 | |
76d33bca TT |
250 | static unsigned int old_bump_val = 128; |
251 | EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); | |
252 | ||
b5799018 TT |
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), | |
efc61345 | 258 | ATTR_LIST(sra_exceeded_retry_limit), |
b5799018 TT |
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), | |
27bc446e | 267 | ATTR_LIST(mb_max_inode_prealloc), |
196e402a | 268 | ATTR_LIST(mb_max_linear_groups), |
b5799018 TT |
269 | ATTR_LIST(max_writeback_mb_bump), |
270 | ATTR_LIST(extent_max_zeroout_kb), | |
271 | ATTR_LIST(trigger_fs_error), | |
272 | ATTR_LIST(err_ratelimit_interval_ms), | |
273 | ATTR_LIST(err_ratelimit_burst), | |
274 | ATTR_LIST(warning_ratelimit_interval_ms), | |
275 | ATTR_LIST(warning_ratelimit_burst), | |
276 | ATTR_LIST(msg_ratelimit_interval_ms), | |
277 | ATTR_LIST(msg_ratelimit_burst), | |
278 | ATTR_LIST(errors_count), | |
1cf006ed DM |
279 | ATTR_LIST(warning_count), |
280 | ATTR_LIST(msg_count), | |
4549b49f TT |
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), | |
b5799018 TT |
291 | ATTR_LIST(first_error_time), |
292 | ATTR_LIST(last_error_time), | |
bc1d69d6 | 293 | ATTR_LIST(journal_task), |
46f870d6 TT |
294 | #ifdef CONFIG_EXT4_DEBUG |
295 | ATTR_LIST(simulate_fail), | |
296 | #endif | |
cfd73237 AZ |
297 | ATTR_LIST(mb_prefetch), |
298 | ATTR_LIST(mb_prefetch_limit), | |
4a69aecb | 299 | ATTR_LIST(last_trim_minblks), |
b5799018 TT |
300 | NULL, |
301 | }; | |
78e9605d | 302 | ATTRIBUTE_GROUPS(ext4); |
b5799018 TT |
303 | |
304 | /* Features this copy of ext4 supports */ | |
76d33bca TT |
305 | EXT4_ATTR_FEATURE(lazy_itable_init); |
306 | EXT4_ATTR_FEATURE(batched_discard); | |
307 | EXT4_ATTR_FEATURE(meta_bg_resize); | |
643fa961 | 308 | #ifdef CONFIG_FS_ENCRYPTION |
76d33bca | 309 | EXT4_ATTR_FEATURE(encryption); |
ed318a6c | 310 | EXT4_ATTR_FEATURE(test_dummy_encryption_v2); |
c4704a4f | 311 | #endif |
db90f419 TT |
312 | #ifdef CONFIG_UNICODE |
313 | EXT4_ATTR_FEATURE(casefold); | |
314 | #endif | |
c93d8f88 EB |
315 | #ifdef CONFIG_FS_VERITY |
316 | EXT4_ATTR_FEATURE(verity); | |
317 | #endif | |
8c81bd8f | 318 | EXT4_ATTR_FEATURE(metadata_csum_seed); |
6694875e | 319 | EXT4_ATTR_FEATURE(fast_commit); |
e71f99f2 | 320 | #if defined(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) |
471fbbea | 321 | EXT4_ATTR_FEATURE(encrypted_casefold); |
e71f99f2 | 322 | #endif |
b5799018 TT |
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), | |
643fa961 | 328 | #ifdef CONFIG_FS_ENCRYPTION |
b5799018 | 329 | ATTR_LIST(encryption), |
ed318a6c | 330 | ATTR_LIST(test_dummy_encryption_v2), |
db90f419 TT |
331 | #endif |
332 | #ifdef CONFIG_UNICODE | |
333 | ATTR_LIST(casefold), | |
c93d8f88 EB |
334 | #endif |
335 | #ifdef CONFIG_FS_VERITY | |
336 | ATTR_LIST(verity), | |
c4704a4f | 337 | #endif |
8c81bd8f | 338 | ATTR_LIST(metadata_csum_seed), |
6694875e | 339 | ATTR_LIST(fast_commit), |
e71f99f2 | 340 | #if defined(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) |
471fbbea | 341 | ATTR_LIST(encrypted_casefold), |
e71f99f2 | 342 | #endif |
b5799018 TT |
343 | NULL, |
344 | }; | |
78e9605d | 345 | ATTRIBUTE_GROUPS(ext4_feat); |
b5799018 | 346 | |
76d33bca TT |
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 | ||
6a0678a7 AB |
360 | static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi) |
361 | { | |
dfac1a16 | 362 | return sysfs_emit(buf, "%lld\n", |
6a0678a7 AB |
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 | ||
b5799018 TT |
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); | |
76d33bca TT |
375 | void *ptr = calc_ptr(a, sbi); |
376 | ||
377 | switch (a->attr_id) { | |
378 | case attr_delayed_allocation_blocks: | |
dfac1a16 | 379 | return sysfs_emit(buf, "%llu\n", |
76d33bca TT |
380 | (s64) EXT4_C2B(sbi, |
381 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); | |
382 | case attr_session_write_kbytes: | |
6ca06829 | 383 | return session_write_kbytes_show(sbi, buf); |
76d33bca | 384 | case attr_lifetime_write_kbytes: |
6ca06829 | 385 | return lifetime_write_kbytes_show(sbi, buf); |
76d33bca | 386 | case attr_reserved_clusters: |
dfac1a16 | 387 | return sysfs_emit(buf, "%llu\n", |
76d33bca TT |
388 | (unsigned long long) |
389 | atomic64_read(&sbi->s_resv_clusters)); | |
efc61345 | 390 | case attr_sra_exceeded_retry_limit: |
dfac1a16 | 391 | return sysfs_emit(buf, "%llu\n", |
efc61345 EW |
392 | (unsigned long long) |
393 | percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit)); | |
76d33bca TT |
394 | case attr_inode_readahead: |
395 | case attr_pointer_ui: | |
396 | if (!ptr) | |
397 | return 0; | |
a4d2aadc | 398 | if (a->attr_ptr == ptr_ext4_super_block_offset) |
dfac1a16 | 399 | return sysfs_emit(buf, "%u\n", |
a4d2aadc AB |
400 | le32_to_cpup(ptr)); |
401 | else | |
dfac1a16 | 402 | return sysfs_emit(buf, "%u\n", |
a4d2aadc | 403 | *((unsigned int *) ptr)); |
46f870d6 TT |
404 | case attr_pointer_ul: |
405 | if (!ptr) | |
406 | return 0; | |
dfac1a16 | 407 | return sysfs_emit(buf, "%lu\n", |
46f870d6 | 408 | *((unsigned long *) ptr)); |
4549b49f TT |
409 | case attr_pointer_u8: |
410 | if (!ptr) | |
411 | return 0; | |
dfac1a16 | 412 | return sysfs_emit(buf, "%u\n", |
4549b49f TT |
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) | |
dfac1a16 | 418 | return sysfs_emit(buf, "%llu\n", |
4549b49f TT |
419 | le64_to_cpup(ptr)); |
420 | else | |
dfac1a16 | 421 | return sysfs_emit(buf, "%llu\n", |
4549b49f TT |
422 | *((unsigned long long *) ptr)); |
423 | case attr_pointer_string: | |
424 | if (!ptr) | |
425 | return 0; | |
dfac1a16 | 426 | return sysfs_emit(buf, "%.*s\n", a->attr_size, |
4549b49f | 427 | (char *) ptr); |
76d33bca TT |
428 | case attr_pointer_atomic: |
429 | if (!ptr) | |
430 | return 0; | |
dfac1a16 | 431 | return sysfs_emit(buf, "%d\n", |
76d33bca TT |
432 | atomic_read((atomic_t *) ptr)); |
433 | case attr_feature: | |
dfac1a16 | 434 | return sysfs_emit(buf, "supported\n"); |
6a0678a7 AB |
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); | |
bc1d69d6 KK |
439 | case attr_journal_task: |
440 | return journal_task_show(sbi, buf); | |
76d33bca TT |
441 | } |
442 | ||
443 | return 0; | |
b5799018 TT |
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); | |
76d33bca TT |
453 | void *ptr = calc_ptr(a, sbi); |
454 | unsigned long t; | |
455 | int ret; | |
b5799018 | 456 | |
76d33bca TT |
457 | switch (a->attr_id) { |
458 | case attr_reserved_clusters: | |
6ca06829 | 459 | return reserved_clusters_store(sbi, buf, len); |
76d33bca TT |
460 | case attr_pointer_ui: |
461 | if (!ptr) | |
462 | return 0; | |
463 | ret = kstrtoul(skip_spaces(buf), 0, &t); | |
464 | if (ret) | |
465 | return ret; | |
a4d2aadc AB |
466 | if (a->attr_ptr == ptr_ext4_super_block_offset) |
467 | *((__le32 *) ptr) = cpu_to_le32(t); | |
468 | else | |
469 | *((unsigned int *) ptr) = t; | |
76d33bca | 470 | return len; |
46f870d6 TT |
471 | case attr_pointer_ul: |
472 | if (!ptr) | |
473 | return 0; | |
474 | ret = kstrtoul(skip_spaces(buf), 0, &t); | |
475 | if (ret) | |
476 | return ret; | |
477 | *((unsigned long *) ptr) = t; | |
478 | return len; | |
76d33bca | 479 | case attr_inode_readahead: |
6ca06829 | 480 | return inode_readahead_blks_store(sbi, buf, len); |
76d33bca | 481 | case attr_trigger_test_error: |
6ca06829 | 482 | return trigger_test_error(sbi, buf, len); |
76d33bca TT |
483 | } |
484 | return 0; | |
b5799018 TT |
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 const struct sysfs_ops ext4_attr_ops = { | |
495 | .show = ext4_attr_show, | |
496 | .store = ext4_attr_store, | |
497 | }; | |
498 | ||
499 | static struct kobj_type ext4_sb_ktype = { | |
78e9605d | 500 | .default_groups = ext4_groups, |
b5799018 TT |
501 | .sysfs_ops = &ext4_attr_ops, |
502 | .release = ext4_sb_release, | |
503 | }; | |
504 | ||
b5799018 | 505 | static struct kobj_type ext4_feat_ktype = { |
78e9605d | 506 | .default_groups = ext4_feat_groups, |
76d33bca | 507 | .sysfs_ops = &ext4_attr_ops, |
b99fee58 | 508 | .release = (void (*)(struct kobject *))kfree, |
b5799018 TT |
509 | }; |
510 | ||
d578b994 JD |
511 | void ext4_notify_error_sysfs(struct ext4_sb_info *sbi) |
512 | { | |
513 | sysfs_notify(&sbi->s_kobj, NULL, "errors_count"); | |
514 | } | |
515 | ||
bc1420ae TN |
516 | static struct kobject *ext4_root; |
517 | ||
b99fee58 | 518 | static struct kobject *ext4_feat; |
b5799018 TT |
519 | |
520 | int ext4_register_sysfs(struct super_block *sb) | |
521 | { | |
522 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
ebd173be | 523 | int err; |
b5799018 | 524 | |
b5799018 | 525 | init_completion(&sbi->s_kobj_unregister); |
bc1420ae | 526 | err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root, |
ebd173be | 527 | "%s", sb->s_id); |
95c4df02 RS |
528 | if (err) { |
529 | kobject_put(&sbi->s_kobj); | |
530 | wait_for_completion(&sbi->s_kobj_unregister); | |
ebd173be | 531 | return err; |
95c4df02 | 532 | } |
ebd173be TT |
533 | |
534 | if (ext4_proc_root) | |
535 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); | |
ebd173be | 536 | if (sbi->s_proc) { |
247dbed8 CH |
537 | proc_create_single_data("options", S_IRUGO, sbi->s_proc, |
538 | ext4_seq_options_show, sb); | |
539 | proc_create_single_data("es_shrinker_info", S_IRUGO, | |
540 | sbi->s_proc, ext4_seq_es_shrinker_info_show, | |
541 | sb); | |
ce8c59d1 HS |
542 | proc_create_single_data("fc_info", 0444, sbi->s_proc, |
543 | ext4_fc_info_show, sb); | |
247dbed8 CH |
544 | proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc, |
545 | &ext4_mb_seq_groups_ops, sb); | |
a6c75eaf HS |
546 | proc_create_single_data("mb_stats", 0444, sbi->s_proc, |
547 | ext4_seq_mb_stats_show, sb); | |
f68f4063 HS |
548 | proc_create_seq_data("mb_structs_summary", 0444, sbi->s_proc, |
549 | &ext4_mb_seq_structs_summary_ops, sb); | |
ebd173be TT |
550 | } |
551 | return 0; | |
552 | } | |
553 | ||
554 | void ext4_unregister_sysfs(struct super_block *sb) | |
555 | { | |
556 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
ebd173be | 557 | |
247dbed8 CH |
558 | if (sbi->s_proc) |
559 | remove_proc_subtree(sb->s_id, ext4_proc_root); | |
ebd173be | 560 | kobject_del(&sbi->s_kobj); |
b5799018 TT |
561 | } |
562 | ||
563 | int __init ext4_init_sysfs(void) | |
564 | { | |
565 | int ret; | |
566 | ||
bc1420ae TN |
567 | ext4_root = kobject_create_and_add("ext4", fs_kobj); |
568 | if (!ext4_root) | |
5dc39711 RS |
569 | return -ENOMEM; |
570 | ||
b99fee58 RS |
571 | ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL); |
572 | if (!ext4_feat) { | |
573 | ret = -ENOMEM; | |
bc1420ae | 574 | goto root_err; |
95c4df02 | 575 | } |
b99fee58 | 576 | |
b99fee58 | 577 | ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype, |
bc1420ae | 578 | ext4_root, "features"); |
b99fee58 RS |
579 | if (ret) |
580 | goto feat_err; | |
581 | ||
582 | ext4_proc_root = proc_mkdir(proc_dirname, NULL); | |
583 | return ret; | |
584 | ||
585 | feat_err: | |
586 | kobject_put(ext4_feat); | |
c2e5df76 | 587 | ext4_feat = NULL; |
bc1420ae TN |
588 | root_err: |
589 | kobject_put(ext4_root); | |
590 | ext4_root = NULL; | |
b5799018 TT |
591 | return ret; |
592 | } | |
593 | ||
594 | void ext4_exit_sysfs(void) | |
595 | { | |
b99fee58 | 596 | kobject_put(ext4_feat); |
c2e5df76 | 597 | ext4_feat = NULL; |
bc1420ae TN |
598 | kobject_put(ext4_root); |
599 | ext4_root = NULL; | |
ebd173be TT |
600 | remove_proc_entry(proc_dirname, NULL); |
601 | ext4_proc_root = NULL; | |
b5799018 TT |
602 | } |
603 |