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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * sysfs.c - sysfs support implementation.
4 *
5 * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
6 * Copyright (C) 2014 HGST, Inc., a Western Digital Company.
7 *
8 * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
9 */
10
11#include <linux/kobject.h>
12
13#include "nilfs.h"
14#include "mdt.h"
15#include "sufile.h"
16#include "cpfile.h"
17#include "sysfs.h"
18
19/* /sys/fs/<nilfs>/ */
20static struct kset *nilfs_kset;
21
22#define NILFS_SHOW_TIME(time_t_val, buf) ({ \
23 struct tm res; \
24 int count = 0; \
25 time64_to_tm(time_t_val, 0, &res); \
26 res.tm_year += 1900; \
27 res.tm_mon += 1; \
28 count = scnprintf(buf, PAGE_SIZE, \
29 "%ld-%.2d-%.2d %.2d:%.2d:%.2d\n", \
30 res.tm_year, res.tm_mon, res.tm_mday, \
31 res.tm_hour, res.tm_min, res.tm_sec);\
32 count; \
33})
34
35#define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
36static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
37 struct attribute *attr, char *buf) \
38{ \
39 struct the_nilfs *nilfs = container_of(kobj->parent, \
40 struct the_nilfs, \
41 ns_##parent_name##_kobj); \
42 struct nilfs_##name##_attr *a = container_of(attr, \
43 struct nilfs_##name##_attr, \
44 attr); \
45 return a->show ? a->show(a, nilfs, buf) : 0; \
46} \
47static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
48 struct attribute *attr, \
49 const char *buf, size_t len) \
50{ \
51 struct the_nilfs *nilfs = container_of(kobj->parent, \
52 struct the_nilfs, \
53 ns_##parent_name##_kobj); \
54 struct nilfs_##name##_attr *a = container_of(attr, \
55 struct nilfs_##name##_attr, \
56 attr); \
57 return a->store ? a->store(a, nilfs, buf, len) : 0; \
58} \
59static const struct sysfs_ops nilfs_##name##_attr_ops = { \
60 .show = nilfs_##name##_attr_show, \
61 .store = nilfs_##name##_attr_store, \
62}
63
64#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
65static void nilfs_##name##_attr_release(struct kobject *kobj) \
66{ \
67 struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
68 struct the_nilfs *nilfs = container_of(kobj->parent, \
69 struct the_nilfs, \
70 ns_##parent_name##_kobj); \
71 subgroups = nilfs->ns_##parent_name##_subgroups; \
72 complete(&subgroups->sg_##name##_kobj_unregister); \
73} \
74static struct kobj_type nilfs_##name##_ktype = { \
75 .default_attrs = nilfs_##name##_attrs, \
76 .sysfs_ops = &nilfs_##name##_attr_ops, \
77 .release = nilfs_##name##_attr_release, \
78}
79
80#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
81static int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
82{ \
83 struct kobject *parent; \
84 struct kobject *kobj; \
85 struct completion *kobj_unregister; \
86 struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
87 int err; \
88 subgroups = nilfs->ns_##parent_name##_subgroups; \
89 kobj = &subgroups->sg_##name##_kobj; \
90 kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
91 parent = &nilfs->ns_##parent_name##_kobj; \
92 kobj->kset = nilfs_kset; \
93 init_completion(kobj_unregister); \
94 err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
95 #name); \
96 if (err) \
97 return err; \
98 return 0; \
99} \
100static void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
101{ \
102 kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
103}
104
105/************************************************************************
106 * NILFS snapshot attrs *
107 ************************************************************************/
108
109static ssize_t
110nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
111 struct nilfs_root *root, char *buf)
112{
113 return snprintf(buf, PAGE_SIZE, "%llu\n",
114 (unsigned long long)atomic64_read(&root->inodes_count));
115}
116
117static ssize_t
118nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr,
119 struct nilfs_root *root, char *buf)
120{
121 return snprintf(buf, PAGE_SIZE, "%llu\n",
122 (unsigned long long)atomic64_read(&root->blocks_count));
123}
124
125static const char snapshot_readme_str[] =
126 "The group contains details about mounted snapshot.\n\n"
127 "(1) inodes_count\n\tshow number of inodes for snapshot.\n\n"
128 "(2) blocks_count\n\tshow number of blocks for snapshot.\n\n";
129
130static ssize_t
131nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr,
132 struct nilfs_root *root, char *buf)
133{
134 return snprintf(buf, PAGE_SIZE, snapshot_readme_str);
135}
136
137NILFS_SNAPSHOT_RO_ATTR(inodes_count);
138NILFS_SNAPSHOT_RO_ATTR(blocks_count);
139NILFS_SNAPSHOT_RO_ATTR(README);
140
141static struct attribute *nilfs_snapshot_attrs[] = {
142 NILFS_SNAPSHOT_ATTR_LIST(inodes_count),
143 NILFS_SNAPSHOT_ATTR_LIST(blocks_count),
144 NILFS_SNAPSHOT_ATTR_LIST(README),
145 NULL,
146};
147
148static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj,
149 struct attribute *attr, char *buf)
150{
151 struct nilfs_root *root =
152 container_of(kobj, struct nilfs_root, snapshot_kobj);
153 struct nilfs_snapshot_attr *a =
154 container_of(attr, struct nilfs_snapshot_attr, attr);
155
156 return a->show ? a->show(a, root, buf) : 0;
157}
158
159static ssize_t nilfs_snapshot_attr_store(struct kobject *kobj,
160 struct attribute *attr,
161 const char *buf, size_t len)
162{
163 struct nilfs_root *root =
164 container_of(kobj, struct nilfs_root, snapshot_kobj);
165 struct nilfs_snapshot_attr *a =
166 container_of(attr, struct nilfs_snapshot_attr, attr);
167
168 return a->store ? a->store(a, root, buf, len) : 0;
169}
170
171static void nilfs_snapshot_attr_release(struct kobject *kobj)
172{
173 struct nilfs_root *root = container_of(kobj, struct nilfs_root,
174 snapshot_kobj);
175 complete(&root->snapshot_kobj_unregister);
176}
177
178static const struct sysfs_ops nilfs_snapshot_attr_ops = {
179 .show = nilfs_snapshot_attr_show,
180 .store = nilfs_snapshot_attr_store,
181};
182
183static struct kobj_type nilfs_snapshot_ktype = {
184 .default_attrs = nilfs_snapshot_attrs,
185 .sysfs_ops = &nilfs_snapshot_attr_ops,
186 .release = nilfs_snapshot_attr_release,
187};
188
189int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root)
190{
191 struct the_nilfs *nilfs;
192 struct kobject *parent;
193 int err;
194
195 nilfs = root->nilfs;
196 parent = &nilfs->ns_dev_subgroups->sg_mounted_snapshots_kobj;
197 root->snapshot_kobj.kset = nilfs_kset;
198 init_completion(&root->snapshot_kobj_unregister);
199
200 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
201 err = kobject_init_and_add(&root->snapshot_kobj,
202 &nilfs_snapshot_ktype,
203 &nilfs->ns_dev_kobj,
204 "current_checkpoint");
205 } else {
206 err = kobject_init_and_add(&root->snapshot_kobj,
207 &nilfs_snapshot_ktype,
208 parent,
209 "%llu", root->cno);
210 }
211
212 if (err)
213 return err;
214
215 return 0;
216}
217
218void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
219{
220 kobject_del(&root->snapshot_kobj);
221}
222
223/************************************************************************
224 * NILFS mounted snapshots attrs *
225 ************************************************************************/
226
227static const char mounted_snapshots_readme_str[] =
228 "The mounted_snapshots group contains group for\n"
229 "every mounted snapshot.\n";
230
231static ssize_t
232nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
233 struct the_nilfs *nilfs, char *buf)
234{
235 return snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
236}
237
238NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
239
240static struct attribute *nilfs_mounted_snapshots_attrs[] = {
241 NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
242 NULL,
243};
244
245NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
246NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
247NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
248
249/************************************************************************
250 * NILFS checkpoints attrs *
251 ************************************************************************/
252
253static ssize_t
254nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr,
255 struct the_nilfs *nilfs,
256 char *buf)
257{
258 __u64 ncheckpoints;
259 struct nilfs_cpstat cpstat;
260 int err;
261
262 down_read(&nilfs->ns_segctor_sem);
263 err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
264 up_read(&nilfs->ns_segctor_sem);
265 if (err < 0) {
266 nilfs_msg(nilfs->ns_sb, KERN_ERR,
267 "unable to get checkpoint stat: err=%d", err);
268 return err;
269 }
270
271 ncheckpoints = cpstat.cs_ncps;
272
273 return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints);
274}
275
276static ssize_t
277nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr,
278 struct the_nilfs *nilfs,
279 char *buf)
280{
281 __u64 nsnapshots;
282 struct nilfs_cpstat cpstat;
283 int err;
284
285 down_read(&nilfs->ns_segctor_sem);
286 err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
287 up_read(&nilfs->ns_segctor_sem);
288 if (err < 0) {
289 nilfs_msg(nilfs->ns_sb, KERN_ERR,
290 "unable to get checkpoint stat: err=%d", err);
291 return err;
292 }
293
294 nsnapshots = cpstat.cs_nsss;
295
296 return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots);
297}
298
299static ssize_t
300nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr,
301 struct the_nilfs *nilfs,
302 char *buf)
303{
304 __u64 last_cno;
305
306 spin_lock(&nilfs->ns_last_segment_lock);
307 last_cno = nilfs->ns_last_cno;
308 spin_unlock(&nilfs->ns_last_segment_lock);
309
310 return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
311}
312
313static ssize_t
314nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr,
315 struct the_nilfs *nilfs,
316 char *buf)
317{
318 __u64 cno;
319
320 down_read(&nilfs->ns_segctor_sem);
321 cno = nilfs->ns_cno;
322 up_read(&nilfs->ns_segctor_sem);
323
324 return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
325}
326
327static const char checkpoints_readme_str[] =
328 "The checkpoints group contains attributes that describe\n"
329 "details about volume's checkpoints.\n\n"
330 "(1) checkpoints_number\n\tshow number of checkpoints on volume.\n\n"
331 "(2) snapshots_number\n\tshow number of snapshots on volume.\n\n"
332 "(3) last_seg_checkpoint\n"
333 "\tshow checkpoint number of the latest segment.\n\n"
334 "(4) next_checkpoint\n\tshow next checkpoint number.\n\n";
335
336static ssize_t
337nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr,
338 struct the_nilfs *nilfs, char *buf)
339{
340 return snprintf(buf, PAGE_SIZE, checkpoints_readme_str);
341}
342
343NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
344NILFS_CHECKPOINTS_RO_ATTR(snapshots_number);
345NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint);
346NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint);
347NILFS_CHECKPOINTS_RO_ATTR(README);
348
349static struct attribute *nilfs_checkpoints_attrs[] = {
350 NILFS_CHECKPOINTS_ATTR_LIST(checkpoints_number),
351 NILFS_CHECKPOINTS_ATTR_LIST(snapshots_number),
352 NILFS_CHECKPOINTS_ATTR_LIST(last_seg_checkpoint),
353 NILFS_CHECKPOINTS_ATTR_LIST(next_checkpoint),
354 NILFS_CHECKPOINTS_ATTR_LIST(README),
355 NULL,
356};
357
358NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
359NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
360NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
361
362/************************************************************************
363 * NILFS segments attrs *
364 ************************************************************************/
365
366static ssize_t
367nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
368 struct the_nilfs *nilfs,
369 char *buf)
370{
371 return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);
372}
373
374static ssize_t
375nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,
376 struct the_nilfs *nilfs,
377 char *buf)
378{
379 return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);
380}
381
382static ssize_t
383nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,
384 struct the_nilfs *nilfs,
385 char *buf)
386{
387 unsigned long ncleansegs;
388
389 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
390 ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
391 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
392
393 return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);
394}
395
396static ssize_t
397nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,
398 struct the_nilfs *nilfs,
399 char *buf)
400{
401 struct nilfs_sustat sustat;
402 int err;
403
404 down_read(&nilfs->ns_segctor_sem);
405 err = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
406 up_read(&nilfs->ns_segctor_sem);
407 if (err < 0) {
408 nilfs_msg(nilfs->ns_sb, KERN_ERR,
409 "unable to get segment stat: err=%d", err);
410 return err;
411 }
412
413 return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);
414}
415
416static const char segments_readme_str[] =
417 "The segments group contains attributes that describe\n"
418 "details about volume's segments.\n\n"
419 "(1) segments_number\n\tshow number of segments on volume.\n\n"
420 "(2) blocks_per_segment\n\tshow number of blocks in segment.\n\n"
421 "(3) clean_segments\n\tshow count of clean segments.\n\n"
422 "(4) dirty_segments\n\tshow count of dirty segments.\n\n";
423
424static ssize_t
425nilfs_segments_README_show(struct nilfs_segments_attr *attr,
426 struct the_nilfs *nilfs,
427 char *buf)
428{
429 return snprintf(buf, PAGE_SIZE, segments_readme_str);
430}
431
432NILFS_SEGMENTS_RO_ATTR(segments_number);
433NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);
434NILFS_SEGMENTS_RO_ATTR(clean_segments);
435NILFS_SEGMENTS_RO_ATTR(dirty_segments);
436NILFS_SEGMENTS_RO_ATTR(README);
437
438static struct attribute *nilfs_segments_attrs[] = {
439 NILFS_SEGMENTS_ATTR_LIST(segments_number),
440 NILFS_SEGMENTS_ATTR_LIST(blocks_per_segment),
441 NILFS_SEGMENTS_ATTR_LIST(clean_segments),
442 NILFS_SEGMENTS_ATTR_LIST(dirty_segments),
443 NILFS_SEGMENTS_ATTR_LIST(README),
444 NULL,
445};
446
447NILFS_DEV_INT_GROUP_OPS(segments, dev);
448NILFS_DEV_INT_GROUP_TYPE(segments, dev);
449NILFS_DEV_INT_GROUP_FNS(segments, dev);
450
451/************************************************************************
452 * NILFS segctor attrs *
453 ************************************************************************/
454
455static ssize_t
456nilfs_segctor_last_pseg_block_show(struct nilfs_segctor_attr *attr,
457 struct the_nilfs *nilfs,
458 char *buf)
459{
460 sector_t last_pseg;
461
462 spin_lock(&nilfs->ns_last_segment_lock);
463 last_pseg = nilfs->ns_last_pseg;
464 spin_unlock(&nilfs->ns_last_segment_lock);
465
466 return snprintf(buf, PAGE_SIZE, "%llu\n",
467 (unsigned long long)last_pseg);
468}
469
470static ssize_t
471nilfs_segctor_last_seg_sequence_show(struct nilfs_segctor_attr *attr,
472 struct the_nilfs *nilfs,
473 char *buf)
474{
475 u64 last_seq;
476
477 spin_lock(&nilfs->ns_last_segment_lock);
478 last_seq = nilfs->ns_last_seq;
479 spin_unlock(&nilfs->ns_last_segment_lock);
480
481 return snprintf(buf, PAGE_SIZE, "%llu\n", last_seq);
482}
483
484static ssize_t
485nilfs_segctor_last_seg_checkpoint_show(struct nilfs_segctor_attr *attr,
486 struct the_nilfs *nilfs,
487 char *buf)
488{
489 __u64 last_cno;
490
491 spin_lock(&nilfs->ns_last_segment_lock);
492 last_cno = nilfs->ns_last_cno;
493 spin_unlock(&nilfs->ns_last_segment_lock);
494
495 return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
496}
497
498static ssize_t
499nilfs_segctor_current_seg_sequence_show(struct nilfs_segctor_attr *attr,
500 struct the_nilfs *nilfs,
501 char *buf)
502{
503 u64 seg_seq;
504
505 down_read(&nilfs->ns_segctor_sem);
506 seg_seq = nilfs->ns_seg_seq;
507 up_read(&nilfs->ns_segctor_sem);
508
509 return snprintf(buf, PAGE_SIZE, "%llu\n", seg_seq);
510}
511
512static ssize_t
513nilfs_segctor_current_last_full_seg_show(struct nilfs_segctor_attr *attr,
514 struct the_nilfs *nilfs,
515 char *buf)
516{
517 __u64 segnum;
518
519 down_read(&nilfs->ns_segctor_sem);
520 segnum = nilfs->ns_segnum;
521 up_read(&nilfs->ns_segctor_sem);
522
523 return snprintf(buf, PAGE_SIZE, "%llu\n", segnum);
524}
525
526static ssize_t
527nilfs_segctor_next_full_seg_show(struct nilfs_segctor_attr *attr,
528 struct the_nilfs *nilfs,
529 char *buf)
530{
531 __u64 nextnum;
532
533 down_read(&nilfs->ns_segctor_sem);
534 nextnum = nilfs->ns_nextnum;
535 up_read(&nilfs->ns_segctor_sem);
536
537 return snprintf(buf, PAGE_SIZE, "%llu\n", nextnum);
538}
539
540static ssize_t
541nilfs_segctor_next_pseg_offset_show(struct nilfs_segctor_attr *attr,
542 struct the_nilfs *nilfs,
543 char *buf)
544{
545 unsigned long pseg_offset;
546
547 down_read(&nilfs->ns_segctor_sem);
548 pseg_offset = nilfs->ns_pseg_offset;
549 up_read(&nilfs->ns_segctor_sem);
550
551 return snprintf(buf, PAGE_SIZE, "%lu\n", pseg_offset);
552}
553
554static ssize_t
555nilfs_segctor_next_checkpoint_show(struct nilfs_segctor_attr *attr,
556 struct the_nilfs *nilfs,
557 char *buf)
558{
559 __u64 cno;
560
561 down_read(&nilfs->ns_segctor_sem);
562 cno = nilfs->ns_cno;
563 up_read(&nilfs->ns_segctor_sem);
564
565 return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
566}
567
568static ssize_t
569nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
570 struct the_nilfs *nilfs,
571 char *buf)
572{
573 time64_t ctime;
574
575 down_read(&nilfs->ns_segctor_sem);
576 ctime = nilfs->ns_ctime;
577 up_read(&nilfs->ns_segctor_sem);
578
579 return NILFS_SHOW_TIME(ctime, buf);
580}
581
582static ssize_t
583nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
584 struct the_nilfs *nilfs,
585 char *buf)
586{
587 time64_t ctime;
588
589 down_read(&nilfs->ns_segctor_sem);
590 ctime = nilfs->ns_ctime;
591 up_read(&nilfs->ns_segctor_sem);
592
593 return snprintf(buf, PAGE_SIZE, "%llu\n", ctime);
594}
595
596static ssize_t
597nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
598 struct the_nilfs *nilfs,
599 char *buf)
600{
601 time64_t nongc_ctime;
602
603 down_read(&nilfs->ns_segctor_sem);
604 nongc_ctime = nilfs->ns_nongc_ctime;
605 up_read(&nilfs->ns_segctor_sem);
606
607 return NILFS_SHOW_TIME(nongc_ctime, buf);
608}
609
610static ssize_t
611nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
612 struct the_nilfs *nilfs,
613 char *buf)
614{
615 time64_t nongc_ctime;
616
617 down_read(&nilfs->ns_segctor_sem);
618 nongc_ctime = nilfs->ns_nongc_ctime;
619 up_read(&nilfs->ns_segctor_sem);
620
621 return snprintf(buf, PAGE_SIZE, "%llu\n", nongc_ctime);
622}
623
624static ssize_t
625nilfs_segctor_dirty_data_blocks_count_show(struct nilfs_segctor_attr *attr,
626 struct the_nilfs *nilfs,
627 char *buf)
628{
629 u32 ndirtyblks;
630
631 down_read(&nilfs->ns_segctor_sem);
632 ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
633 up_read(&nilfs->ns_segctor_sem);
634
635 return snprintf(buf, PAGE_SIZE, "%u\n", ndirtyblks);
636}
637
638static const char segctor_readme_str[] =
639 "The segctor group contains attributes that describe\n"
640 "segctor thread activity details.\n\n"
641 "(1) last_pseg_block\n"
642 "\tshow start block number of the latest segment.\n\n"
643 "(2) last_seg_sequence\n"
644 "\tshow sequence value of the latest segment.\n\n"
645 "(3) last_seg_checkpoint\n"
646 "\tshow checkpoint number of the latest segment.\n\n"
647 "(4) current_seg_sequence\n\tshow segment sequence counter.\n\n"
648 "(5) current_last_full_seg\n"
649 "\tshow index number of the latest full segment.\n\n"
650 "(6) next_full_seg\n"
651 "\tshow index number of the full segment index to be used next.\n\n"
652 "(7) next_pseg_offset\n"
653 "\tshow offset of next partial segment in the current full segment.\n\n"
654 "(8) next_checkpoint\n\tshow next checkpoint number.\n\n"
655 "(9) last_seg_write_time\n"
656 "\tshow write time of the last segment in human-readable format.\n\n"
657 "(10) last_seg_write_time_secs\n"
658 "\tshow write time of the last segment in seconds.\n\n"
659 "(11) last_nongc_write_time\n"
660 "\tshow write time of the last segment not for cleaner operation "
661 "in human-readable format.\n\n"
662 "(12) last_nongc_write_time_secs\n"
663 "\tshow write time of the last segment not for cleaner operation "
664 "in seconds.\n\n"
665 "(13) dirty_data_blocks_count\n"
666 "\tshow number of dirty data blocks.\n\n";
667
668static ssize_t
669nilfs_segctor_README_show(struct nilfs_segctor_attr *attr,
670 struct the_nilfs *nilfs, char *buf)
671{
672 return snprintf(buf, PAGE_SIZE, segctor_readme_str);
673}
674
675NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
676NILFS_SEGCTOR_RO_ATTR(last_seg_sequence);
677NILFS_SEGCTOR_RO_ATTR(last_seg_checkpoint);
678NILFS_SEGCTOR_RO_ATTR(current_seg_sequence);
679NILFS_SEGCTOR_RO_ATTR(current_last_full_seg);
680NILFS_SEGCTOR_RO_ATTR(next_full_seg);
681NILFS_SEGCTOR_RO_ATTR(next_pseg_offset);
682NILFS_SEGCTOR_RO_ATTR(next_checkpoint);
683NILFS_SEGCTOR_RO_ATTR(last_seg_write_time);
684NILFS_SEGCTOR_RO_ATTR(last_seg_write_time_secs);
685NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time);
686NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time_secs);
687NILFS_SEGCTOR_RO_ATTR(dirty_data_blocks_count);
688NILFS_SEGCTOR_RO_ATTR(README);
689
690static struct attribute *nilfs_segctor_attrs[] = {
691 NILFS_SEGCTOR_ATTR_LIST(last_pseg_block),
692 NILFS_SEGCTOR_ATTR_LIST(last_seg_sequence),
693 NILFS_SEGCTOR_ATTR_LIST(last_seg_checkpoint),
694 NILFS_SEGCTOR_ATTR_LIST(current_seg_sequence),
695 NILFS_SEGCTOR_ATTR_LIST(current_last_full_seg),
696 NILFS_SEGCTOR_ATTR_LIST(next_full_seg),
697 NILFS_SEGCTOR_ATTR_LIST(next_pseg_offset),
698 NILFS_SEGCTOR_ATTR_LIST(next_checkpoint),
699 NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time),
700 NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time_secs),
701 NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time),
702 NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time_secs),
703 NILFS_SEGCTOR_ATTR_LIST(dirty_data_blocks_count),
704 NILFS_SEGCTOR_ATTR_LIST(README),
705 NULL,
706};
707
708NILFS_DEV_INT_GROUP_OPS(segctor, dev);
709NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
710NILFS_DEV_INT_GROUP_FNS(segctor, dev);
711
712/************************************************************************
713 * NILFS superblock attrs *
714 ************************************************************************/
715
716static ssize_t
717nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
718 struct the_nilfs *nilfs,
719 char *buf)
720{
721 time64_t sbwtime;
722
723 down_read(&nilfs->ns_sem);
724 sbwtime = nilfs->ns_sbwtime;
725 up_read(&nilfs->ns_sem);
726
727 return NILFS_SHOW_TIME(sbwtime, buf);
728}
729
730static ssize_t
731nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
732 struct the_nilfs *nilfs,
733 char *buf)
734{
735 time64_t sbwtime;
736
737 down_read(&nilfs->ns_sem);
738 sbwtime = nilfs->ns_sbwtime;
739 up_read(&nilfs->ns_sem);
740
741 return snprintf(buf, PAGE_SIZE, "%llu\n", sbwtime);
742}
743
744static ssize_t
745nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
746 struct the_nilfs *nilfs,
747 char *buf)
748{
749 unsigned int sbwcount;
750
751 down_read(&nilfs->ns_sem);
752 sbwcount = nilfs->ns_sbwcount;
753 up_read(&nilfs->ns_sem);
754
755 return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
756}
757
758static ssize_t
759nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
760 struct the_nilfs *nilfs,
761 char *buf)
762{
763 unsigned int sb_update_freq;
764
765 down_read(&nilfs->ns_sem);
766 sb_update_freq = nilfs->ns_sb_update_freq;
767 up_read(&nilfs->ns_sem);
768
769 return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
770}
771
772static ssize_t
773nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
774 struct the_nilfs *nilfs,
775 const char *buf, size_t count)
776{
777 unsigned int val;
778 int err;
779
780 err = kstrtouint(skip_spaces(buf), 0, &val);
781 if (err) {
782 nilfs_msg(nilfs->ns_sb, KERN_ERR,
783 "unable to convert string: err=%d", err);
784 return err;
785 }
786
787 if (val < NILFS_SB_FREQ) {
788 val = NILFS_SB_FREQ;
789 nilfs_msg(nilfs->ns_sb, KERN_WARNING,
790 "superblock update frequency cannot be lesser than 10 seconds");
791 }
792
793 down_write(&nilfs->ns_sem);
794 nilfs->ns_sb_update_freq = val;
795 up_write(&nilfs->ns_sem);
796
797 return count;
798}
799
800static const char sb_readme_str[] =
801 "The superblock group contains attributes that describe\n"
802 "superblock's details.\n\n"
803 "(1) sb_write_time\n\tshow previous write time of super block "
804 "in human-readable format.\n\n"
805 "(2) sb_write_time_secs\n\tshow previous write time of super block "
806 "in seconds.\n\n"
807 "(3) sb_write_count\n\tshow write count of super block.\n\n"
808 "(4) sb_update_frequency\n"
809 "\tshow/set interval of periodical update of superblock (in seconds).\n\n"
810 "\tYou can set preferable frequency of superblock update by command:\n\n"
811 "\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
812
813static ssize_t
814nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
815 struct the_nilfs *nilfs, char *buf)
816{
817 return snprintf(buf, PAGE_SIZE, sb_readme_str);
818}
819
820NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
821NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
822NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
823NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
824NILFS_SUPERBLOCK_RO_ATTR(README);
825
826static struct attribute *nilfs_superblock_attrs[] = {
827 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
828 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
829 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
830 NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
831 NILFS_SUPERBLOCK_ATTR_LIST(README),
832 NULL,
833};
834
835NILFS_DEV_INT_GROUP_OPS(superblock, dev);
836NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
837NILFS_DEV_INT_GROUP_FNS(superblock, dev);
838
839/************************************************************************
840 * NILFS device attrs *
841 ************************************************************************/
842
843static
844ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
845 struct the_nilfs *nilfs,
846 char *buf)
847{
848 struct nilfs_super_block **sbp = nilfs->ns_sbp;
849 u32 major = le32_to_cpu(sbp[0]->s_rev_level);
850 u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
851
852 return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
853}
854
855static
856ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
857 struct the_nilfs *nilfs,
858 char *buf)
859{
860 return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
861}
862
863static
864ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
865 struct the_nilfs *nilfs,
866 char *buf)
867{
868 struct nilfs_super_block **sbp = nilfs->ns_sbp;
869 u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
870
871 return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
872}
873
874static
875ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
876 struct the_nilfs *nilfs,
877 char *buf)
878{
879 sector_t free_blocks = 0;
880
881 nilfs_count_free_blocks(nilfs, &free_blocks);
882 return snprintf(buf, PAGE_SIZE, "%llu\n",
883 (unsigned long long)free_blocks);
884}
885
886static
887ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
888 struct the_nilfs *nilfs,
889 char *buf)
890{
891 struct nilfs_super_block **sbp = nilfs->ns_sbp;
892
893 return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
894}
895
896static
897ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
898 struct the_nilfs *nilfs,
899 char *buf)
900{
901 struct nilfs_super_block **sbp = nilfs->ns_sbp;
902
903 return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
904 sbp[0]->s_volume_name);
905}
906
907static const char dev_readme_str[] =
908 "The <device> group contains attributes that describe file system\n"
909 "partition's details.\n\n"
910 "(1) revision\n\tshow NILFS file system revision.\n\n"
911 "(2) blocksize\n\tshow volume block size in bytes.\n\n"
912 "(3) device_size\n\tshow volume size in bytes.\n\n"
913 "(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
914 "(5) uuid\n\tshow volume's UUID.\n\n"
915 "(6) volume_name\n\tshow volume's name.\n\n";
916
917static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
918 struct the_nilfs *nilfs,
919 char *buf)
920{
921 return snprintf(buf, PAGE_SIZE, dev_readme_str);
922}
923
924NILFS_DEV_RO_ATTR(revision);
925NILFS_DEV_RO_ATTR(blocksize);
926NILFS_DEV_RO_ATTR(device_size);
927NILFS_DEV_RO_ATTR(free_blocks);
928NILFS_DEV_RO_ATTR(uuid);
929NILFS_DEV_RO_ATTR(volume_name);
930NILFS_DEV_RO_ATTR(README);
931
932static struct attribute *nilfs_dev_attrs[] = {
933 NILFS_DEV_ATTR_LIST(revision),
934 NILFS_DEV_ATTR_LIST(blocksize),
935 NILFS_DEV_ATTR_LIST(device_size),
936 NILFS_DEV_ATTR_LIST(free_blocks),
937 NILFS_DEV_ATTR_LIST(uuid),
938 NILFS_DEV_ATTR_LIST(volume_name),
939 NILFS_DEV_ATTR_LIST(README),
940 NULL,
941};
942
943static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
944 struct attribute *attr, char *buf)
945{
946 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
947 ns_dev_kobj);
948 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
949 attr);
950
951 return a->show ? a->show(a, nilfs, buf) : 0;
952}
953
954static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
955 struct attribute *attr,
956 const char *buf, size_t len)
957{
958 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
959 ns_dev_kobj);
960 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
961 attr);
962
963 return a->store ? a->store(a, nilfs, buf, len) : 0;
964}
965
966static void nilfs_dev_attr_release(struct kobject *kobj)
967{
968 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
969 ns_dev_kobj);
970 complete(&nilfs->ns_dev_kobj_unregister);
971}
972
973static const struct sysfs_ops nilfs_dev_attr_ops = {
974 .show = nilfs_dev_attr_show,
975 .store = nilfs_dev_attr_store,
976};
977
978static struct kobj_type nilfs_dev_ktype = {
979 .default_attrs = nilfs_dev_attrs,
980 .sysfs_ops = &nilfs_dev_attr_ops,
981 .release = nilfs_dev_attr_release,
982};
983
984int nilfs_sysfs_create_device_group(struct super_block *sb)
985{
986 struct the_nilfs *nilfs = sb->s_fs_info;
987 size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
988 int err;
989
990 nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
991 if (unlikely(!nilfs->ns_dev_subgroups)) {
992 err = -ENOMEM;
993 nilfs_msg(sb, KERN_ERR,
994 "unable to allocate memory for device group");
995 goto failed_create_device_group;
996 }
997
998 nilfs->ns_dev_kobj.kset = nilfs_kset;
999 init_completion(&nilfs->ns_dev_kobj_unregister);
1000 err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
1001 "%s", sb->s_id);
1002 if (err)
1003 goto free_dev_subgroups;
1004
1005 err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
1006 if (err)
1007 goto cleanup_dev_kobject;
1008
1009 err = nilfs_sysfs_create_checkpoints_group(nilfs);
1010 if (err)
1011 goto delete_mounted_snapshots_group;
1012
1013 err = nilfs_sysfs_create_segments_group(nilfs);
1014 if (err)
1015 goto delete_checkpoints_group;
1016
1017 err = nilfs_sysfs_create_superblock_group(nilfs);
1018 if (err)
1019 goto delete_segments_group;
1020
1021 err = nilfs_sysfs_create_segctor_group(nilfs);
1022 if (err)
1023 goto delete_superblock_group;
1024
1025 return 0;
1026
1027delete_superblock_group:
1028 nilfs_sysfs_delete_superblock_group(nilfs);
1029
1030delete_segments_group:
1031 nilfs_sysfs_delete_segments_group(nilfs);
1032
1033delete_checkpoints_group:
1034 nilfs_sysfs_delete_checkpoints_group(nilfs);
1035
1036delete_mounted_snapshots_group:
1037 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1038
1039cleanup_dev_kobject:
1040 kobject_del(&nilfs->ns_dev_kobj);
1041
1042free_dev_subgroups:
1043 kfree(nilfs->ns_dev_subgroups);
1044
1045failed_create_device_group:
1046 return err;
1047}
1048
1049void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
1050{
1051 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1052 nilfs_sysfs_delete_checkpoints_group(nilfs);
1053 nilfs_sysfs_delete_segments_group(nilfs);
1054 nilfs_sysfs_delete_superblock_group(nilfs);
1055 nilfs_sysfs_delete_segctor_group(nilfs);
1056 kobject_del(&nilfs->ns_dev_kobj);
1057 kfree(nilfs->ns_dev_subgroups);
1058}
1059
1060/************************************************************************
1061 * NILFS feature attrs *
1062 ************************************************************************/
1063
1064static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
1065 struct attribute *attr, char *buf)
1066{
1067 return snprintf(buf, PAGE_SIZE, "%d.%d\n",
1068 NILFS_CURRENT_REV, NILFS_MINOR_REV);
1069}
1070
1071static const char features_readme_str[] =
1072 "The features group contains attributes that describe NILFS file\n"
1073 "system driver features.\n\n"
1074 "(1) revision\n\tshow current revision of NILFS file system driver.\n";
1075
1076static ssize_t nilfs_feature_README_show(struct kobject *kobj,
1077 struct attribute *attr,
1078 char *buf)
1079{
1080 return snprintf(buf, PAGE_SIZE, features_readme_str);
1081}
1082
1083NILFS_FEATURE_RO_ATTR(revision);
1084NILFS_FEATURE_RO_ATTR(README);
1085
1086static struct attribute *nilfs_feature_attrs[] = {
1087 NILFS_FEATURE_ATTR_LIST(revision),
1088 NILFS_FEATURE_ATTR_LIST(README),
1089 NULL,
1090};
1091
1092static const struct attribute_group nilfs_feature_attr_group = {
1093 .name = "features",
1094 .attrs = nilfs_feature_attrs,
1095};
1096
1097int __init nilfs_sysfs_init(void)
1098{
1099 int err;
1100
1101 nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj);
1102 if (!nilfs_kset) {
1103 err = -ENOMEM;
1104 nilfs_msg(NULL, KERN_ERR,
1105 "unable to create sysfs entry: err=%d", err);
1106 goto failed_sysfs_init;
1107 }
1108
1109 err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1110 if (unlikely(err)) {
1111 nilfs_msg(NULL, KERN_ERR,
1112 "unable to create feature group: err=%d", err);
1113 goto cleanup_sysfs_init;
1114 }
1115
1116 return 0;
1117
1118cleanup_sysfs_init:
1119 kset_unregister(nilfs_kset);
1120
1121failed_sysfs_init:
1122 return err;
1123}
1124
1125void nilfs_sysfs_exit(void)
1126{
1127 sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1128 kset_unregister(nilfs_kset);
1129}