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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> | |
14 | #include <linux/proc_fs.h> | |
15 | ||
16 | #include "ext4.h" | |
17 | #include "ext4_jbd2.h" | |
18 | ||
76d33bca TT |
19 | typedef enum { |
20 | attr_noop, | |
21 | attr_delayed_allocation_blocks, | |
22 | attr_session_write_kbytes, | |
23 | attr_lifetime_write_kbytes, | |
24 | attr_reserved_clusters, | |
25 | attr_inode_readahead, | |
26 | attr_trigger_test_error, | |
27 | attr_feature, | |
28 | attr_pointer_ui, | |
29 | attr_pointer_atomic, | |
30 | } attr_id_t; | |
31 | ||
32 | typedef enum { | |
33 | ptr_explicit, | |
34 | ptr_ext4_sb_info_offset, | |
35 | ptr_ext4_super_block_offset, | |
36 | } attr_ptr_t; | |
37 | ||
d6006186 | 38 | static const char proc_dirname[] = "fs/ext4"; |
ebd173be TT |
39 | static struct proc_dir_entry *ext4_proc_root; |
40 | ||
b5799018 TT |
41 | struct ext4_attr { |
42 | struct attribute attr; | |
76d33bca TT |
43 | short attr_id; |
44 | short attr_ptr; | |
b5799018 TT |
45 | union { |
46 | int offset; | |
76d33bca | 47 | void *explicit_ptr; |
b5799018 TT |
48 | } u; |
49 | }; | |
50 | ||
b5799018 TT |
51 | static ssize_t session_write_kbytes_show(struct ext4_attr *a, |
52 | struct ext4_sb_info *sbi, char *buf) | |
53 | { | |
54 | struct super_block *sb = sbi->s_buddy_cache->i_sb; | |
55 | ||
56 | if (!sb->s_bdev->bd_part) | |
57 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
58 | return snprintf(buf, PAGE_SIZE, "%lu\n", | |
59 | (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - | |
60 | sbi->s_sectors_written_start) >> 1); | |
61 | } | |
62 | ||
63 | static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, | |
64 | struct ext4_sb_info *sbi, char *buf) | |
65 | { | |
66 | struct super_block *sb = sbi->s_buddy_cache->i_sb; | |
67 | ||
68 | if (!sb->s_bdev->bd_part) | |
69 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
70 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
71 | (unsigned long long)(sbi->s_kbytes_written + | |
72 | ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - | |
73 | EXT4_SB(sb)->s_sectors_written_start) >> 1))); | |
74 | } | |
75 | ||
76 | static ssize_t inode_readahead_blks_store(struct ext4_attr *a, | |
77 | struct ext4_sb_info *sbi, | |
78 | const char *buf, size_t count) | |
79 | { | |
80 | unsigned long t; | |
81 | int ret; | |
82 | ||
83 | ret = kstrtoul(skip_spaces(buf), 0, &t); | |
84 | if (ret) | |
85 | return ret; | |
86 | ||
87 | if (t && (!is_power_of_2(t) || t > 0x40000000)) | |
88 | return -EINVAL; | |
89 | ||
90 | sbi->s_inode_readahead_blks = t; | |
91 | return count; | |
92 | } | |
93 | ||
b5799018 TT |
94 | static ssize_t reserved_clusters_store(struct ext4_attr *a, |
95 | struct ext4_sb_info *sbi, | |
96 | const char *buf, size_t count) | |
97 | { | |
98 | unsigned long long val; | |
99 | ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> | |
100 | sbi->s_cluster_bits); | |
76d33bca | 101 | int ret; |
b5799018 | 102 | |
76d33bca | 103 | ret = kstrtoull(skip_spaces(buf), 0, &val); |
1ea1516f | 104 | if (ret || val >= clusters) |
b5799018 TT |
105 | return -EINVAL; |
106 | ||
107 | atomic64_set(&sbi->s_resv_clusters, val); | |
108 | return count; | |
109 | } | |
110 | ||
111 | static ssize_t trigger_test_error(struct ext4_attr *a, | |
112 | struct ext4_sb_info *sbi, | |
113 | const char *buf, size_t count) | |
114 | { | |
115 | int len = count; | |
116 | ||
117 | if (!capable(CAP_SYS_ADMIN)) | |
118 | return -EPERM; | |
119 | ||
120 | if (len && buf[len-1] == '\n') | |
121 | len--; | |
122 | ||
123 | if (len) | |
124 | ext4_error(sbi->s_sb, "%.*s", len, buf); | |
125 | return count; | |
126 | } | |
127 | ||
76d33bca TT |
128 | #define EXT4_ATTR(_name,_mode,_id) \ |
129 | static struct ext4_attr ext4_attr_##_name = { \ | |
130 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
131 | .attr_id = attr_##_id, \ | |
b5799018 TT |
132 | } |
133 | ||
76d33bca TT |
134 | #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) |
135 | ||
136 | #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) | |
137 | ||
138 | #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ | |
b5799018 TT |
139 | static struct ext4_attr ext4_attr_##_name = { \ |
140 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
76d33bca TT |
141 | .attr_id = attr_##_id, \ |
142 | .attr_ptr = ptr_##_struct##_offset, \ | |
b5799018 | 143 | .u = { \ |
76d33bca | 144 | .offset = offsetof(struct _struct, _elname),\ |
b5799018 TT |
145 | }, \ |
146 | } | |
147 | ||
76d33bca TT |
148 | #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ |
149 | EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) | |
b5799018 | 150 | |
76d33bca TT |
151 | #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ |
152 | EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) | |
b5799018 | 153 | |
76d33bca | 154 | #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ |
b5799018 | 155 | static struct ext4_attr ext4_attr_##_name = { \ |
76d33bca TT |
156 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
157 | .attr_id = attr_##_id, \ | |
158 | .attr_ptr = ptr_explicit, \ | |
b5799018 | 159 | .u = { \ |
76d33bca | 160 | .explicit_ptr = _ptr, \ |
b5799018 TT |
161 | }, \ |
162 | } | |
163 | ||
76d33bca TT |
164 | #define ATTR_LIST(name) &ext4_attr_##name.attr |
165 | ||
166 | EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); | |
167 | EXT4_ATTR_FUNC(session_write_kbytes, 0444); | |
168 | EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); | |
169 | EXT4_ATTR_FUNC(reserved_clusters, 0644); | |
170 | ||
171 | EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, | |
172 | ext4_sb_info, s_inode_readahead_blks); | |
b5799018 TT |
173 | EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); |
174 | EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); | |
175 | EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); | |
176 | EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); | |
177 | EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); | |
178 | EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); | |
179 | EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); | |
b5799018 | 180 | EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); |
76d33bca | 181 | EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); |
b5799018 TT |
182 | EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); |
183 | EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); | |
184 | EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); | |
185 | EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); | |
186 | EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); | |
187 | EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); | |
188 | EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); | |
189 | EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time); | |
190 | EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time); | |
191 | ||
76d33bca TT |
192 | static unsigned int old_bump_val = 128; |
193 | EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); | |
194 | ||
b5799018 TT |
195 | static struct attribute *ext4_attrs[] = { |
196 | ATTR_LIST(delayed_allocation_blocks), | |
197 | ATTR_LIST(session_write_kbytes), | |
198 | ATTR_LIST(lifetime_write_kbytes), | |
199 | ATTR_LIST(reserved_clusters), | |
200 | ATTR_LIST(inode_readahead_blks), | |
201 | ATTR_LIST(inode_goal), | |
202 | ATTR_LIST(mb_stats), | |
203 | ATTR_LIST(mb_max_to_scan), | |
204 | ATTR_LIST(mb_min_to_scan), | |
205 | ATTR_LIST(mb_order2_req), | |
206 | ATTR_LIST(mb_stream_req), | |
207 | ATTR_LIST(mb_group_prealloc), | |
208 | ATTR_LIST(max_writeback_mb_bump), | |
209 | ATTR_LIST(extent_max_zeroout_kb), | |
210 | ATTR_LIST(trigger_fs_error), | |
211 | ATTR_LIST(err_ratelimit_interval_ms), | |
212 | ATTR_LIST(err_ratelimit_burst), | |
213 | ATTR_LIST(warning_ratelimit_interval_ms), | |
214 | ATTR_LIST(warning_ratelimit_burst), | |
215 | ATTR_LIST(msg_ratelimit_interval_ms), | |
216 | ATTR_LIST(msg_ratelimit_burst), | |
217 | ATTR_LIST(errors_count), | |
218 | ATTR_LIST(first_error_time), | |
219 | ATTR_LIST(last_error_time), | |
220 | NULL, | |
221 | }; | |
222 | ||
223 | /* Features this copy of ext4 supports */ | |
76d33bca TT |
224 | EXT4_ATTR_FEATURE(lazy_itable_init); |
225 | EXT4_ATTR_FEATURE(batched_discard); | |
226 | EXT4_ATTR_FEATURE(meta_bg_resize); | |
c4704a4f | 227 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
76d33bca | 228 | EXT4_ATTR_FEATURE(encryption); |
c4704a4f | 229 | #endif |
8c81bd8f | 230 | EXT4_ATTR_FEATURE(metadata_csum_seed); |
b5799018 TT |
231 | |
232 | static struct attribute *ext4_feat_attrs[] = { | |
233 | ATTR_LIST(lazy_itable_init), | |
234 | ATTR_LIST(batched_discard), | |
235 | ATTR_LIST(meta_bg_resize), | |
c4704a4f | 236 | #ifdef CONFIG_EXT4_FS_ENCRYPTION |
b5799018 | 237 | ATTR_LIST(encryption), |
c4704a4f | 238 | #endif |
8c81bd8f | 239 | ATTR_LIST(metadata_csum_seed), |
b5799018 TT |
240 | NULL, |
241 | }; | |
242 | ||
76d33bca TT |
243 | static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) |
244 | { | |
245 | switch (a->attr_ptr) { | |
246 | case ptr_explicit: | |
247 | return a->u.explicit_ptr; | |
248 | case ptr_ext4_sb_info_offset: | |
249 | return (void *) (((char *) sbi) + a->u.offset); | |
250 | case ptr_ext4_super_block_offset: | |
251 | return (void *) (((char *) sbi->s_es) + a->u.offset); | |
252 | } | |
253 | return NULL; | |
254 | } | |
255 | ||
b5799018 TT |
256 | static ssize_t ext4_attr_show(struct kobject *kobj, |
257 | struct attribute *attr, char *buf) | |
258 | { | |
259 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, | |
260 | s_kobj); | |
261 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); | |
76d33bca TT |
262 | void *ptr = calc_ptr(a, sbi); |
263 | ||
264 | switch (a->attr_id) { | |
265 | case attr_delayed_allocation_blocks: | |
266 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
267 | (s64) EXT4_C2B(sbi, | |
268 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); | |
269 | case attr_session_write_kbytes: | |
270 | return session_write_kbytes_show(a, sbi, buf); | |
271 | case attr_lifetime_write_kbytes: | |
272 | return lifetime_write_kbytes_show(a, sbi, buf); | |
273 | case attr_reserved_clusters: | |
274 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
275 | (unsigned long long) | |
276 | atomic64_read(&sbi->s_resv_clusters)); | |
277 | case attr_inode_readahead: | |
278 | case attr_pointer_ui: | |
279 | if (!ptr) | |
280 | return 0; | |
281 | return snprintf(buf, PAGE_SIZE, "%u\n", | |
282 | *((unsigned int *) ptr)); | |
283 | case attr_pointer_atomic: | |
284 | if (!ptr) | |
285 | return 0; | |
286 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
287 | atomic_read((atomic_t *) ptr)); | |
288 | case attr_feature: | |
289 | return snprintf(buf, PAGE_SIZE, "supported\n"); | |
290 | } | |
291 | ||
292 | return 0; | |
b5799018 TT |
293 | } |
294 | ||
295 | static ssize_t ext4_attr_store(struct kobject *kobj, | |
296 | struct attribute *attr, | |
297 | const char *buf, size_t len) | |
298 | { | |
299 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, | |
300 | s_kobj); | |
301 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); | |
76d33bca TT |
302 | void *ptr = calc_ptr(a, sbi); |
303 | unsigned long t; | |
304 | int ret; | |
b5799018 | 305 | |
76d33bca TT |
306 | switch (a->attr_id) { |
307 | case attr_reserved_clusters: | |
308 | return reserved_clusters_store(a, sbi, buf, len); | |
309 | case attr_pointer_ui: | |
310 | if (!ptr) | |
311 | return 0; | |
312 | ret = kstrtoul(skip_spaces(buf), 0, &t); | |
313 | if (ret) | |
314 | return ret; | |
315 | *((unsigned int *) ptr) = t; | |
316 | return len; | |
317 | case attr_inode_readahead: | |
318 | return inode_readahead_blks_store(a, sbi, buf, len); | |
319 | case attr_trigger_test_error: | |
320 | return trigger_test_error(a, sbi, buf, len); | |
321 | } | |
322 | return 0; | |
b5799018 TT |
323 | } |
324 | ||
325 | static void ext4_sb_release(struct kobject *kobj) | |
326 | { | |
327 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, | |
328 | s_kobj); | |
329 | complete(&sbi->s_kobj_unregister); | |
330 | } | |
331 | ||
332 | static const struct sysfs_ops ext4_attr_ops = { | |
333 | .show = ext4_attr_show, | |
334 | .store = ext4_attr_store, | |
335 | }; | |
336 | ||
337 | static struct kobj_type ext4_sb_ktype = { | |
338 | .default_attrs = ext4_attrs, | |
339 | .sysfs_ops = &ext4_attr_ops, | |
340 | .release = ext4_sb_release, | |
341 | }; | |
342 | ||
343 | static struct kobj_type ext4_ktype = { | |
344 | .sysfs_ops = &ext4_attr_ops, | |
345 | }; | |
346 | ||
347 | static struct kset ext4_kset = { | |
348 | .kobj = {.ktype = &ext4_ktype}, | |
349 | }; | |
350 | ||
b5799018 TT |
351 | static struct kobj_type ext4_feat_ktype = { |
352 | .default_attrs = ext4_feat_attrs, | |
76d33bca | 353 | .sysfs_ops = &ext4_attr_ops, |
b5799018 TT |
354 | }; |
355 | ||
356 | static struct kobject ext4_feat = { | |
357 | .kset = &ext4_kset, | |
358 | }; | |
359 | ||
ebd173be TT |
360 | #define PROC_FILE_SHOW_DEFN(name) \ |
361 | static int name##_open(struct inode *inode, struct file *file) \ | |
362 | { \ | |
363 | return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \ | |
364 | } \ | |
365 | \ | |
681c46b1 | 366 | static const struct file_operations ext4_seq_##name##_fops = { \ |
ebd173be TT |
367 | .open = name##_open, \ |
368 | .read = seq_read, \ | |
369 | .llseek = seq_lseek, \ | |
370 | .release = single_release, \ | |
371 | } | |
372 | ||
373 | #define PROC_FILE_LIST(name) \ | |
374 | { __stringify(name), &ext4_seq_##name##_fops } | |
375 | ||
376 | PROC_FILE_SHOW_DEFN(es_shrinker_info); | |
377 | PROC_FILE_SHOW_DEFN(options); | |
378 | ||
d6006186 | 379 | static const struct ext4_proc_files { |
ebd173be TT |
380 | const char *name; |
381 | const struct file_operations *fops; | |
382 | } proc_files[] = { | |
383 | PROC_FILE_LIST(options), | |
384 | PROC_FILE_LIST(es_shrinker_info), | |
385 | PROC_FILE_LIST(mb_groups), | |
386 | { NULL, NULL }, | |
387 | }; | |
388 | ||
b5799018 TT |
389 | int ext4_register_sysfs(struct super_block *sb) |
390 | { | |
391 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
d6006186 | 392 | const struct ext4_proc_files *p; |
ebd173be | 393 | int err; |
b5799018 TT |
394 | |
395 | sbi->s_kobj.kset = &ext4_kset; | |
396 | init_completion(&sbi->s_kobj_unregister); | |
ebd173be TT |
397 | err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL, |
398 | "%s", sb->s_id); | |
399 | if (err) | |
400 | return err; | |
401 | ||
402 | if (ext4_proc_root) | |
403 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); | |
404 | ||
405 | if (sbi->s_proc) { | |
406 | for (p = proc_files; p->name; p++) | |
407 | proc_create_data(p->name, S_IRUGO, sbi->s_proc, | |
408 | p->fops, sb); | |
409 | } | |
410 | return 0; | |
411 | } | |
412 | ||
413 | void ext4_unregister_sysfs(struct super_block *sb) | |
414 | { | |
415 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
d6006186 | 416 | const struct ext4_proc_files *p; |
ebd173be TT |
417 | |
418 | if (sbi->s_proc) { | |
419 | for (p = proc_files; p->name; p++) | |
420 | remove_proc_entry(p->name, sbi->s_proc); | |
421 | remove_proc_entry(sb->s_id, ext4_proc_root); | |
422 | } | |
423 | kobject_del(&sbi->s_kobj); | |
b5799018 TT |
424 | } |
425 | ||
426 | int __init ext4_init_sysfs(void) | |
427 | { | |
428 | int ret; | |
429 | ||
430 | kobject_set_name(&ext4_kset.kobj, "ext4"); | |
431 | ext4_kset.kobj.parent = fs_kobj; | |
432 | ret = kset_register(&ext4_kset); | |
433 | if (ret) | |
434 | return ret; | |
435 | ||
436 | ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype, | |
437 | NULL, "features"); | |
438 | if (ret) | |
439 | kset_unregister(&ext4_kset); | |
ebd173be TT |
440 | else |
441 | ext4_proc_root = proc_mkdir(proc_dirname, NULL); | |
b5799018 TT |
442 | return ret; |
443 | } | |
444 | ||
445 | void ext4_exit_sysfs(void) | |
446 | { | |
447 | kobject_put(&ext4_feat); | |
448 | kset_unregister(&ext4_kset); | |
ebd173be TT |
449 | remove_proc_entry(proc_dirname, NULL); |
450 | ext4_proc_root = NULL; | |
b5799018 TT |
451 | } |
452 |