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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
21typedef 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
42typedef enum {
43 ptr_explicit,
44 ptr_ext4_sb_info_offset,
45 ptr_ext4_super_block_offset,
46} attr_ptr_t;
47
48static const char proc_dirname[] = "fs/ext4";
49static struct proc_dir_entry *ext4_proc_root;
50
51struct 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
62static 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 snprintf(buf, PAGE_SIZE, "%lu\n",
67 (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
68 sbi->s_sectors_written_start) >> 1);
69}
70
71static 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 snprintf(buf, PAGE_SIZE, "%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
81static 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(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
98static 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(sbi->s_es) >>
103 sbi->s_cluster_bits);
104 int ret;
105
106 ret = kstrtoull(skip_spaces(buf), 0, &val);
107 if (ret || val >= clusters)
108 return -EINVAL;
109
110 atomic64_set(&sbi->s_resv_clusters, val);
111 return count;
112}
113
114static 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
130static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
131{
132 if (!sbi->s_journal)
133 return snprintf(buf, PAGE_SIZE, "<none>\n");
134 return snprintf(buf, PAGE_SIZE, "%d\n",
135 task_pid_vnr(sbi->s_journal->j_task));
136}
137
138#define EXT4_ATTR(_name,_mode,_id) \
139static 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) \
149static 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) \
159static 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) \
191static 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
202EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
203EXT4_ATTR_FUNC(session_write_kbytes, 0444);
204EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
205EXT4_ATTR_FUNC(reserved_clusters, 0644);
206EXT4_ATTR_FUNC(sra_exceeded_retry_limit, 0444);
207
208EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
209 ext4_sb_info, s_inode_readahead_blks);
210EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
211EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
212EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
213EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
214EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
215EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
216EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
217EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc);
218EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
219EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
220EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
221EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
222EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
223EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
224EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
225EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
226#ifdef CONFIG_EXT4_DEBUG
227EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
228#endif
229EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
230EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
231EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
232EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
233EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
234EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
235EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
236EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
237EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
238EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
239EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
240EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
241EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
242EXT4_ATTR(first_error_time, 0444, first_error_time);
243EXT4_ATTR(last_error_time, 0444, last_error_time);
244EXT4_ATTR(journal_task, 0444, journal_task);
245EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
246EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
247
248static unsigned int old_bump_val = 128;
249EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
250
251static struct attribute *ext4_attrs[] = {
252 ATTR_LIST(delayed_allocation_blocks),
253 ATTR_LIST(session_write_kbytes),
254 ATTR_LIST(lifetime_write_kbytes),
255 ATTR_LIST(reserved_clusters),
256 ATTR_LIST(sra_exceeded_retry_limit),
257 ATTR_LIST(inode_readahead_blks),
258 ATTR_LIST(inode_goal),
259 ATTR_LIST(mb_stats),
260 ATTR_LIST(mb_max_to_scan),
261 ATTR_LIST(mb_min_to_scan),
262 ATTR_LIST(mb_order2_req),
263 ATTR_LIST(mb_stream_req),
264 ATTR_LIST(mb_group_prealloc),
265 ATTR_LIST(mb_max_inode_prealloc),
266 ATTR_LIST(max_writeback_mb_bump),
267 ATTR_LIST(extent_max_zeroout_kb),
268 ATTR_LIST(trigger_fs_error),
269 ATTR_LIST(err_ratelimit_interval_ms),
270 ATTR_LIST(err_ratelimit_burst),
271 ATTR_LIST(warning_ratelimit_interval_ms),
272 ATTR_LIST(warning_ratelimit_burst),
273 ATTR_LIST(msg_ratelimit_interval_ms),
274 ATTR_LIST(msg_ratelimit_burst),
275 ATTR_LIST(errors_count),
276 ATTR_LIST(warning_count),
277 ATTR_LIST(msg_count),
278 ATTR_LIST(first_error_ino),
279 ATTR_LIST(last_error_ino),
280 ATTR_LIST(first_error_block),
281 ATTR_LIST(last_error_block),
282 ATTR_LIST(first_error_line),
283 ATTR_LIST(last_error_line),
284 ATTR_LIST(first_error_func),
285 ATTR_LIST(last_error_func),
286 ATTR_LIST(first_error_errcode),
287 ATTR_LIST(last_error_errcode),
288 ATTR_LIST(first_error_time),
289 ATTR_LIST(last_error_time),
290 ATTR_LIST(journal_task),
291#ifdef CONFIG_EXT4_DEBUG
292 ATTR_LIST(simulate_fail),
293#endif
294 ATTR_LIST(mb_prefetch),
295 ATTR_LIST(mb_prefetch_limit),
296 NULL,
297};
298ATTRIBUTE_GROUPS(ext4);
299
300
301EXT4_ATTR_FEATURE(lazy_itable_init);
302EXT4_ATTR_FEATURE(batched_discard);
303EXT4_ATTR_FEATURE(meta_bg_resize);
304#ifdef CONFIG_FS_ENCRYPTION
305EXT4_ATTR_FEATURE(encryption);
306EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
307#endif
308#ifdef CONFIG_UNICODE
309EXT4_ATTR_FEATURE(casefold);
310#endif
311#ifdef CONFIG_FS_VERITY
312EXT4_ATTR_FEATURE(verity);
313#endif
314EXT4_ATTR_FEATURE(metadata_csum_seed);
315EXT4_ATTR_FEATURE(fast_commit);
316
317static struct attribute *ext4_feat_attrs[] = {
318 ATTR_LIST(lazy_itable_init),
319 ATTR_LIST(batched_discard),
320 ATTR_LIST(meta_bg_resize),
321#ifdef CONFIG_FS_ENCRYPTION
322 ATTR_LIST(encryption),
323 ATTR_LIST(test_dummy_encryption_v2),
324#endif
325#ifdef CONFIG_UNICODE
326 ATTR_LIST(casefold),
327#endif
328#ifdef CONFIG_FS_VERITY
329 ATTR_LIST(verity),
330#endif
331 ATTR_LIST(metadata_csum_seed),
332 ATTR_LIST(fast_commit),
333 NULL,
334};
335ATTRIBUTE_GROUPS(ext4_feat);
336
337static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
338{
339 switch (a->attr_ptr) {
340 case ptr_explicit:
341 return a->u.explicit_ptr;
342 case ptr_ext4_sb_info_offset:
343 return (void *) (((char *) sbi) + a->u.offset);
344 case ptr_ext4_super_block_offset:
345 return (void *) (((char *) sbi->s_es) + a->u.offset);
346 }
347 return NULL;
348}
349
350static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
351{
352 return snprintf(buf, PAGE_SIZE, "%lld\n",
353 ((time64_t)hi << 32) + le32_to_cpu(lo));
354}
355
356#define print_tstamp(buf, es, tstamp) \
357 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
358
359static ssize_t ext4_attr_show(struct kobject *kobj,
360 struct attribute *attr, char *buf)
361{
362 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
363 s_kobj);
364 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
365 void *ptr = calc_ptr(a, sbi);
366
367 switch (a->attr_id) {
368 case attr_delayed_allocation_blocks:
369 return snprintf(buf, PAGE_SIZE, "%llu\n",
370 (s64) EXT4_C2B(sbi,
371 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
372 case attr_session_write_kbytes:
373 return session_write_kbytes_show(sbi, buf);
374 case attr_lifetime_write_kbytes:
375 return lifetime_write_kbytes_show(sbi, buf);
376 case attr_reserved_clusters:
377 return snprintf(buf, PAGE_SIZE, "%llu\n",
378 (unsigned long long)
379 atomic64_read(&sbi->s_resv_clusters));
380 case attr_sra_exceeded_retry_limit:
381 return snprintf(buf, PAGE_SIZE, "%llu\n",
382 (unsigned long long)
383 percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
384 case attr_inode_readahead:
385 case attr_pointer_ui:
386 if (!ptr)
387 return 0;
388 if (a->attr_ptr == ptr_ext4_super_block_offset)
389 return snprintf(buf, PAGE_SIZE, "%u\n",
390 le32_to_cpup(ptr));
391 else
392 return snprintf(buf, PAGE_SIZE, "%u\n",
393 *((unsigned int *) ptr));
394 case attr_pointer_ul:
395 if (!ptr)
396 return 0;
397 return snprintf(buf, PAGE_SIZE, "%lu\n",
398 *((unsigned long *) ptr));
399 case attr_pointer_u8:
400 if (!ptr)
401 return 0;
402 return snprintf(buf, PAGE_SIZE, "%u\n",
403 *((unsigned char *) ptr));
404 case attr_pointer_u64:
405 if (!ptr)
406 return 0;
407 if (a->attr_ptr == ptr_ext4_super_block_offset)
408 return snprintf(buf, PAGE_SIZE, "%llu\n",
409 le64_to_cpup(ptr));
410 else
411 return snprintf(buf, PAGE_SIZE, "%llu\n",
412 *((unsigned long long *) ptr));
413 case attr_pointer_string:
414 if (!ptr)
415 return 0;
416 return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
417 (char *) ptr);
418 case attr_pointer_atomic:
419 if (!ptr)
420 return 0;
421 return snprintf(buf, PAGE_SIZE, "%d\n",
422 atomic_read((atomic_t *) ptr));
423 case attr_feature:
424 return snprintf(buf, PAGE_SIZE, "supported\n");
425 case attr_first_error_time:
426 return print_tstamp(buf, sbi->s_es, s_first_error_time);
427 case attr_last_error_time:
428 return print_tstamp(buf, sbi->s_es, s_last_error_time);
429 case attr_journal_task:
430 return journal_task_show(sbi, buf);
431 }
432
433 return 0;
434}
435
436static ssize_t ext4_attr_store(struct kobject *kobj,
437 struct attribute *attr,
438 const char *buf, size_t len)
439{
440 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
441 s_kobj);
442 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
443 void *ptr = calc_ptr(a, sbi);
444 unsigned long t;
445 int ret;
446
447 switch (a->attr_id) {
448 case attr_reserved_clusters:
449 return reserved_clusters_store(sbi, buf, len);
450 case attr_pointer_ui:
451 if (!ptr)
452 return 0;
453 ret = kstrtoul(skip_spaces(buf), 0, &t);
454 if (ret)
455 return ret;
456 if (a->attr_ptr == ptr_ext4_super_block_offset)
457 *((__le32 *) ptr) = cpu_to_le32(t);
458 else
459 *((unsigned int *) ptr) = t;
460 return len;
461 case attr_pointer_ul:
462 if (!ptr)
463 return 0;
464 ret = kstrtoul(skip_spaces(buf), 0, &t);
465 if (ret)
466 return ret;
467 *((unsigned long *) ptr) = t;
468 return len;
469 case attr_inode_readahead:
470 return inode_readahead_blks_store(sbi, buf, len);
471 case attr_trigger_test_error:
472 return trigger_test_error(sbi, buf, len);
473 }
474 return 0;
475}
476
477static void ext4_sb_release(struct kobject *kobj)
478{
479 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
480 s_kobj);
481 complete(&sbi->s_kobj_unregister);
482}
483
484static const struct sysfs_ops ext4_attr_ops = {
485 .show = ext4_attr_show,
486 .store = ext4_attr_store,
487};
488
489static struct kobj_type ext4_sb_ktype = {
490 .default_groups = ext4_groups,
491 .sysfs_ops = &ext4_attr_ops,
492 .release = ext4_sb_release,
493};
494
495static struct kobj_type ext4_feat_ktype = {
496 .default_groups = ext4_feat_groups,
497 .sysfs_ops = &ext4_attr_ops,
498 .release = (void (*)(struct kobject *))kfree,
499};
500
501static struct kobject *ext4_root;
502
503static struct kobject *ext4_feat;
504
505int ext4_register_sysfs(struct super_block *sb)
506{
507 struct ext4_sb_info *sbi = EXT4_SB(sb);
508 int err;
509
510 init_completion(&sbi->s_kobj_unregister);
511 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
512 "%s", sb->s_id);
513 if (err) {
514 kobject_put(&sbi->s_kobj);
515 wait_for_completion(&sbi->s_kobj_unregister);
516 return err;
517 }
518
519 if (ext4_proc_root)
520 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
521 if (sbi->s_proc) {
522 proc_create_single_data("options", S_IRUGO, sbi->s_proc,
523 ext4_seq_options_show, sb);
524 proc_create_single_data("es_shrinker_info", S_IRUGO,
525 sbi->s_proc, ext4_seq_es_shrinker_info_show,
526 sb);
527 proc_create_single_data("fc_info", 0444, sbi->s_proc,
528 ext4_fc_info_show, sb);
529 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
530 &ext4_mb_seq_groups_ops, sb);
531 }
532 return 0;
533}
534
535void ext4_unregister_sysfs(struct super_block *sb)
536{
537 struct ext4_sb_info *sbi = EXT4_SB(sb);
538
539 if (sbi->s_proc)
540 remove_proc_subtree(sb->s_id, ext4_proc_root);
541 kobject_del(&sbi->s_kobj);
542}
543
544int __init ext4_init_sysfs(void)
545{
546 int ret;
547
548 ext4_root = kobject_create_and_add("ext4", fs_kobj);
549 if (!ext4_root)
550 return -ENOMEM;
551
552 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
553 if (!ext4_feat) {
554 ret = -ENOMEM;
555 goto root_err;
556 }
557
558 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
559 ext4_root, "features");
560 if (ret)
561 goto feat_err;
562
563 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
564 return ret;
565
566feat_err:
567 kobject_put(ext4_feat);
568 ext4_feat = NULL;
569root_err:
570 kobject_put(ext4_root);
571 ext4_root = NULL;
572 return ret;
573}
574
575void ext4_exit_sysfs(void)
576{
577 kobject_put(ext4_feat);
578 ext4_feat = NULL;
579 kobject_put(ext4_root);
580 ext4_root = NULL;
581 remove_proc_entry(proc_dirname, NULL);
582 ext4_proc_root = NULL;
583}
584
585
